/* 现代化移动端优先CSS重置 */

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 现代化配色方案 - 绿色主题 */
    --primary-color: #10b981;          /* 主色调 - 现代绿色 */
    --primary-light: #6ee7b7;          /* 主色调浅色 */
    --primary-dark: #059669;           /* 主色调深色 */
    --secondary-color: #94bd00;        /* 辅助色 - 活力橙色 */
    --accent-color: #3b82f6;           /* 强调色 - 蓝色 */
    --danger-color: #ef4444;           /* 危险色 - 警告红色 */

    /* 扩展色系 */
    --success-color: var(--primary-color); /* 成功色 - 使用主色调 */
    --success-light: var(--primary-light); /* 成功色浅色 */
    --success-dark: var(--primary-dark);   /* 成功色深色 */
    --warning-color: var(--secondary-color); /* 警告色 - 使用辅助色 */
    --warning-light: #fef3c7;             /* 警告色浅色 */
    --warning-dark: #d97706;              /* 警告色深色 */

    /* 中性色系 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* 文本颜色 */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-500);
    --text-inverse: #ffffff;

    /* 背景颜色 */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 5rem;
    --space-5xl: 6rem;
    --space-6xl: 8rem;

    /* 字体大小 */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;

    /* 动画时长 */
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    overflow-x: visible; /* 确保水平内容不被截断 */
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: visible; /* 允许水平滚动内容显示 */
    padding-top: 60px; /* 为固定导航栏留出空间 */
}

/* 容器样式 - 移动端优先 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    overflow: visible; /* 确保内容不被截断 */
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-lg);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-xl);
    }
}

/* 移动端导航栏 - 白色磨砂玻璃效果 */
.mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.85); /* 白色半透明背景 */
    backdrop-filter: blur(30px); /* 增强磨砂效果 */
    -webkit-backdrop-filter: blur(30px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2); /* 白色半透明边框 */
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1); /* 柔和阴影 */
    z-index: 1000;
    transition: all var(--duration-normal) ease;
}

/* 滚动时导航栏增强效果 */
.mobile-nav.scrolled {
    background: rgba(255, 255, 255, 0.95); /* 滚动时增加不透明度 */
    backdrop-filter: blur(40px); /* 增强磨砂效果 */
    -webkit-backdrop-filter: blur(40px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1); /* 滚动时使用深色边框 */
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15); /* 增强阴影 */
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    height: 60px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-logo-img {
    width: 32px;
    height: 32px;
    border-radius: 50%; /* 圆形logo */
    background: transparent; /* 确保背景透明 */
}

.nav-brand {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary); /* 白色背景下使用深色文字 */
}

.nav-menu-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.menu-line {
    width: 20px;
    height: 2px;
    background: var(--text-primary); /* 白色背景下使用深色线条 */
    margin: 2px 0;
    transition: all var(--duration-normal) ease;
    border-radius: 1px;
}

.nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95); /* 白色半透明背景 */
    backdrop-filter: blur(30px); /* 磨砂玻璃效果 */
    -webkit-backdrop-filter: blur(30px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2); /* 白色半透明边框 */
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1); /* 柔和阴影 */
    padding: var(--space-md);
    display: none;
    gap: var(--space-md);
    flex-direction: column;
}

.nav-menu.active {
    display: flex;
}

.nav-link {
    color: var(--text-secondary); /* 白色背景下使用深色文字 */
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-sm) 0;
    transition: color var(--duration-fast) ease;
}

.nav-link:hover {
    color: var(--primary-color); /* 悬停时使用主色调 */
}

/* 返回顶部按钮 - 移动端优化 */
.back-to-top {
    position: fixed;
    right: var(--space-md);
    bottom: var(--space-md);
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) ease;
    z-index: 999;
    box-shadow: var(--shadow-lg);
    border: none;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: var(--primary-dark);
}

.back-to-top:active {
    transform: translateY(0);
}

/* Hero区域 - 现代化移动端设计 */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    /* 移除padding-top，因为body已经有了 */
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--secondary-color) 100%);
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    background-size: 100px 100px, 150px 150px;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--text-inverse);
    max-width: 90%;
    padding: var(--space-xl) var(--space-md);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--space-xl);
    font-size: var(--text-sm);
    font-weight: 600;
}

.hero-title {
    margin-bottom: var(--space-lg);
}

.title-main {
    display: block;
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, #ffffff 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-sub {
    display: block;
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    font-weight: 500;
    opacity: 0.9;
}

.hero-description {
    font-size: var(--text-lg);
    line-height: 1.7;
    margin-bottom: var(--space-2xl);
    opacity: 0.9;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.hero-description strong {
    font-weight: 700;
    color: var(--text-inverse);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    min-width: 80px;
}

.stat-number {
    font-size: var(--text-2xl);
    font-weight: 800;
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: var(--text-sm);
    opacity: 0.8;
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
}

.cta-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--text-inverse);
    color: var(--primary-color);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    box-shadow: var(--shadow-lg);
}

.cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.cta-secondary {
    background: transparent;
    color: var(--text-inverse);
    padding: var(--space-md) var(--space-xl);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
}

.cta-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}



/* 核心优势区域 - 现代化设计 */
.advantages-section {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

/* 通用区域头部样式 */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: var(--gray-100);
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.advantages-container {
    max-width: 1000px;
    margin: 0 auto;
}

/* 主要优势卡片 */
.advantage-main-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-2xl);
    color: var(--text-inverse);
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.advantage-main-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    transform: translate(50%, -50%);
}

.main-card-header {
    display: flex;
    align-items: flex-start;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.main-card-icon {
    width: 64px;
    height: 64px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.main-card-content {
    flex: 1;
}

.main-card-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.main-card-desc {
    font-size: var(--text-lg);
    opacity: 0.9;
    line-height: 1.6;
}

.main-card-highlight {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.highlight-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.comparison {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.comparison-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
}

.platform {
    font-weight: 500;
}

.rate {
    font-weight: 700;
    font-size: var(--text-lg);
}

.rate.negative {
    color: #fca5a5;
}

.rate.positive {
    color: #86efac;
}

/* 其他优势卡片网格 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.advantage-card {
    background: var(--bg-primary);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    transition: all var(--duration-normal) ease;
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--duration-normal) ease;
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

/* 移动端激活状态 - 大屏移动端 (481px - 767px) */
@media (min-width: 481px) and (max-width: 767px) {
    .advantage-card.mobile-activated {
        transform: translateY(-8px) !important;
        box-shadow: var(--shadow-xl) !important;
        /* 使用具体颜色值确保绿色边框可见 */
        border: 2px solid #10b981 !important;
        border-radius: var(--radius-xl) !important;
        position: relative !important;
        z-index: 10 !important;
        opacity: 1 !important;
        visibility: visible !important;
        display: block !important;
        background: white !important;
        /* 确保激活状态的边框在滚动时可见 */
        transform-style: preserve-3d;
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
    }

    .advantage-card.mobile-activated::before {
        transform: scaleX(1);
    }

    /* 禁用移动端的hover效果，避免与激活状态冲突，但保留动画效果 */
    .advantage-card:hover:not(.mobile-activated) {
        /* 只对非激活状态的卡片禁用hover效果，不影响动画 */
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--gray-200) !important;
        border-radius: var(--radius-xl) !important;
    }

    .advantage-card:hover::before {
        transform: scaleX(0);
    }

    /* 确保移动端卡片正确显示和交互 */
    .advantage-card {
        /* 移动端不使用fadeInUp动画，直接显示 */
        opacity: 1 !important;
        transform: translateY(0) !important;
        animation: none !important;
        /* 确保边框在移动端正确显示 - 使用具体颜色值 */
        border: 2px solid #e5e7eb !important;
        border-radius: var(--radius-xl) !important;
        /* 确保卡片可见性 */
        visibility: visible !important;
        display: block !important;
        /* 优化移动端的触摸体验 */
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
        cursor: pointer;
        user-select: none;
        -webkit-user-select: none;
        /* 防止transform影响边框渲染 */
        transform-style: preserve-3d;
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
        /* 强制设置背景色确保对比度 */
        background: white !important;
    }

    .advantage-card:nth-child(1) { animation-delay: 0.1s !important; }
    .advantage-card:nth-child(2) { animation-delay: 0.2s !important; }
    .advantage-card:nth-child(3) { animation-delay: 0.3s !important; }
    .advantage-card:nth-child(4) { animation-delay: 0.4s !important; }

    /* 确保激活状态在触摸设备上正确显示 */
    .advantage-card.mobile-activated:hover {
        transform: translateY(-8px);
        box-shadow: var(--shadow-xl);
        border: 1px solid var(--primary-color) !important;
        border-radius: var(--radius-xl) !important;
        /* 确保hover状态的边框在滚动时可见 */
        transform-style: preserve-3d;
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
    }

    .advantage-card.mobile-activated:hover::before {
        transform: scaleX(1);
    }

    /* 优化移动端的触摸体验，合并到上面的定义中 */

    /* 移动端激活状态样式 - 仅保留非AA功能区域的样式 */
}

.card-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-lg);
    color: var(--text-inverse);
}

.card-icon img {
    width: 32px;
    height: 32px;
    /* 确保SVG图标正确显示 */
    filter: brightness(0) invert(1);
    /* 防止图片拖拽 */
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
}

.card-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.card-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.card-highlight {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-xs);
}

.highlight-price {
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--primary-color);
}

.highlight-unit {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    font-weight: 500;
}

/* ===== 功能展示区域 - 移动端优先手风琴设计 ===== */
.features-section {
    padding: var(--space-5xl) 0;
    background: linear-gradient(135deg, #fafbff 0%, #f1f5f9 50%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(34, 197, 94, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(5, 150, 105, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

/* 功能展示区域专用头部样式 */
.features-section .section-header {
    margin-bottom: var(--space-2xl);
    position: relative;
    z-index: 1;
}

.features-section .section-badge {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(16, 185, 129, 0.1));
    border: 1px solid rgba(34, 197, 94, 0.2);
    color: #22c55e;
    font-weight: 700;
    padding: var(--space-md) var(--space-xl);
    box-shadow: 0 4px 6px -1px rgba(34, 197, 94, 0.1);
}

.features-section .section-title {
    background: linear-gradient(135deg, #1e293b, #475569, #22c55e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-lg);
}

.features-section .section-subtitle {
    color: var(--text-secondary);
    font-size: var(--text-xl);
    font-weight: 500;
}

/* 现代化功能展示列表 */
.features-list {
    max-width: 1000px !important; /* 与advantages-container保持一致 */
    width: 100% !important;
    margin: 0 auto !important;
    padding: 0; /* 移除padding，与advantages-container保持一致 */
    position: relative;
    z-index: 1;
    box-sizing: border-box;
}

.feature-item {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-lg);
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #22c55e, #10b981, #059669);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow:
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.feature-item:hover::before {
    opacity: 1;
}

.feature-item.expanded {
    transform: translateY(-2px);
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(34, 197, 94, 0.1);
}

.feature-item.expanded::before {
    opacity: 1;
}

/* 现代化功能项头部 */
.feature-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    position: relative;
}

.feature-header:hover {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.05), rgba(16, 185, 129, 0.05));
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, #22c55e, #10b981);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow:
        0 4px 6px -1px rgba(34, 197, 94, 0.3),
        0 2px 4px -1px rgba(34, 197, 94, 0.2);
    transition: all 0.3s ease;
}

.feature-header:hover .feature-icon {
    transform: scale(1.05);
    box-shadow:
        0 8px 25px -5px rgba(34, 197, 94, 0.4),
        0 4px 6px -1px rgba(34, 197, 94, 0.3);
}

.feature-icon-svg {
    color: white;
    width: 24px;
    height: 24px;
}

.icon-text {
    font-size: var(--text-sm);
    color: white;
    font-weight: 600;
}

.feature-info {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.feature-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #1e293b, #475569);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    line-height: 1.2;
}

.feature-arrow {
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    background: rgba(34, 197, 94, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 32px;
    min-width: 32px;
}

.feature-header:hover .feature-arrow {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.feature-item.expanded .feature-arrow {
    transform: rotate(180deg);
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.feature-item.collapsed .feature-arrow {
    transform: rotate(0deg);
    background: rgba(148, 163, 184, 0.1); /* 重置为默认背景色 */
    color: var(--text-secondary); /* 重置为默认文字颜色 */
}

/* 现代化功能内容区域 */
.feature-content {
    padding: 0 var(--space-xl) var(--space-xl);
    border-top: 1px solid rgba(34, 197, 94, 0.1);
    background: linear-gradient(135deg, rgba(248, 250, 252, 0.8), rgba(241, 245, 249, 0.8));
    backdrop-filter: blur(5px);
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 1;
    max-height: 1000px;
    position: relative;
}

.feature-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: var(--space-xl);
    right: var(--space-xl);
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(34, 197, 94, 0.3), transparent);
}

.feature-item.collapsed .feature-content {
    opacity: 0;
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    border-top: none;
}

/* 现代化步骤头部 */
.step-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding-top: var(--space-xl);
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #22c55e, #10b981);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-base);
    font-weight: 700;
    flex-shrink: 0;
    box-shadow:
        0 4px 6px -1px rgba(34, 197, 94, 0.3),
        0 2px 4px -1px rgba(34, 197, 94, 0.2);
    position: relative;
}

.step-number::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: linear-gradient(135deg, #22c55e, #10b981);
    z-index: -1;
    opacity: 0.2;
}

.step-title {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.4;
    background: linear-gradient(135deg, #1e293b, #475569);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 现代化功能图片容器 */
.feature-image-container {
    margin-bottom: var(--space-xl);
    position: relative;
}

.feature-placeholder {
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    border: 2px dashed rgba(34, 197, 94, 0.2);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.feature-placeholder:hover {
    border-color: rgba(34, 197, 94, 0.4);
    background: linear-gradient(135deg, #fafbff, #f1f5f9);
}

.feature-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 30%, rgba(34, 197, 94, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(16, 185, 129, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.placeholder-icon {
    opacity: 0.6;
    z-index: 1;
    position: relative;
    transition: all 0.3s ease;
}

.feature-placeholder:hover .placeholder-icon {
    opacity: 0.8;
    transform: scale(1.05);
}

/* 现代化步骤内容 */
.step-content {
    margin-bottom: var(--space-lg);
    padding: var(--space-lg);
    background: rgba(255, 255, 255, 0.6);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(34, 197, 94, 0.1);
    position: relative;
}

.step-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(135deg, #22c55e, #10b981);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.step-description {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
    font-weight: 500;
}

/* 现代化响应式设计 */
@media (max-width: 767px) {
    /* 移动端隐藏所有装饰性绿色条和指示器 */
    .feature-item::before,
    .feature-item:hover::before,
    .feature-item.expanded::before,
    .mobile-nav-indicator,
    #mobileNavIndicator {
        display: none !important;
    }

    .features-section {
        padding: 60px 0;
    }

    .features-list {
        padding: 0; /* 移除padding，与advantages-container保持一致 */
        max-width: 100%;
    }

    .feature-item {
        margin-bottom: var(--space-md);
    }

    .feature-header {
        padding: var(--space-md) var(--space-lg);
        gap: var(--space-md);
        min-height: 60px; /* 降低collapsed状态高度 */
    }

    /* 确保移动端feature-item collapsed状态更紧凑 */
    .feature-item.collapsed .feature-header {
        padding: var(--space-sm) var(--space-lg);
        min-height: 56px;
    }

    .feature-icon {
        width: 48px;
        height: 48px;
    }

    .feature-icon-svg {
        width: 24px;
        height: 24px;
    }

    .feature-content {
        padding: 0 var(--space-lg) var(--space-lg);
    }

    .step-header {
        padding-top: var(--space-lg);
        gap: var(--space-md);
    }

    .step-number {
        width: 36px;
        height: 36px;
        font-size: var(--text-sm);
    }

    .feature-title {
        font-size: var(--text-lg);
        line-height: 1.4;
        margin: 0 !important; /* 移除默认margin确保垂直居中 */
        padding: 0;
        display: flex;
        align-items: center;
        height: 100%;
    }

    /* 移动端feature-arrow垂直居中 */
    .feature-arrow {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 32px;
        min-width: 32px;
    }

    /* 移动端feature-info确保垂直居中 */
    .feature-info {
        align-items: center !important;
        min-height: 44px;
        height: 100%;
    }

    .step-title {
        font-size: var(--text-base);
    }

    .step-content {
        padding: var(--space-md);
    }

    .step-description {
        font-size: var(--text-sm);
    }
}

@media (min-width: 768px) {
    .features-list {
        max-width: 1000px !important; /* 与advantages-container保持一致 */
        width: 100% !important;
    }

    .feature-item:hover {
        transform: translateY(-6px);
    }

    .feature-header:hover .feature-icon {
        transform: scale(1.08);
    }
}

@media (min-width: 1024px) {
    .features-section {
        padding: var(--space-6xl) 0;
    }

    .features-list {
        max-width: 1000px !important; /* 与advantages-container保持一致 */
        width: 100% !important;
        padding: 0; /* 移除padding，与advantages-container保持一致 */
    }

    .feature-item {
        margin-bottom: var(--space-xl);
    }
}

/* 动画关键帧 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200px 0;
    }
    100% {
        background-position: calc(200px + 100%) 0;
    }
}

/* 入场动画 */
.feature-item {
    animation: fadeInUp 0.6s ease-out;
}

.feature-item:nth-child(1) { animation-delay: 0.1s; }
.feature-item:nth-child(2) { animation-delay: 0.2s; }
.feature-item:nth-child(3) { animation-delay: 0.3s; }
.feature-item:nth-child(4) { animation-delay: 0.4s; }
.feature-item:nth-child(5) { animation-delay: 0.5s; }

/* 加载时的微光效果 */
.feature-placeholder::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    background-size: 200px 100%;
    animation: shimmer 2s infinite;
}

/* 步骤编号的脉冲效果 */
.step-number {
    animation: pulse 2s infinite;
}

/* 减少动画在移动端的使用 */
@media (prefers-reduced-motion: reduce) {
    .feature-item,
    .step-number,
    .feature-placeholder::after {
        animation: none;
    }

    .feature-item:hover {
        transform: none;
    }

    .feature-header:hover .feature-icon {
        transform: none;
    }

    /* AA功能区域动画禁用 */
    .aa-features-section .animated-rect-1,
    .aa-features-section .animated-rect-2,
    .aa-features-section .animated-rect-3,
    .aa-features-section .animated-rect-4 {
        animation: none;
    }
}

/* ===== 新的现代卡片样式 ===== */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.feature-card {
    /* 统一背景色设置 */
    background: #F3FCF8;
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    /* 保持hidden以维持卡片圆角效果 */
    overflow: hidden;
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
    /* 移除过渡动画效果 */
    position: relative;
    /* 为内部阴影留出空间 */
    padding-bottom: var(--space-md);
}

/* 移除 feature-card hover 效果 */

.feature-card-header {
    /* 减少下内边距，保持其他方向的内边距 */
    padding: var(--space-xl) var(--space-xl) var(--space-sm) var(--space-xl);
    /* 移除背景色，使用父容器的背景色 */
    background: transparent;
    /* 移除头部分割线 */
    border-bottom: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    gap: var(--space-md);
}

.feature-card-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: #000000;
    margin: 0;
    flex: 1;
}

.detail-steps-btn {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: 50px;
    font-size: var(--text-sm);
    font-weight: 400;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.2);
    position: relative;
    overflow: hidden;
}

.detail-steps-btn:hover {
    background: linear-gradient(135deg, #16a34a, #15803d);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(34, 197, 94, 0.3);
}

.detail-steps-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.2);
}

.detail-steps-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.detail-steps-btn:hover::before {
    left: 100%;
}

.feature-card-image {
    position: relative;
    aspect-ratio: 4/5; /* 修改为4:5纵向比例 */
    /* 改为visible以显示图片阴影 */
    overflow: visible;
    /* 增加margin为阴影留出空间 */
    margin: var(--space-lg) var(--space-lg) var(--space-xl) var(--space-lg);
    /* 增加padding为阴影留出更多空间 */
    padding: var(--space-xs);
    border: none;
    /* 移除背景色，使用父容器的背景色 */
    background: transparent;
    /* 添加圆角效果 */
    border-radius: 12px;
    /* 确保容器尺寸稳定 */
    box-sizing: border-box;
    /* 防止内容溢出，但允许阴影显示 */
    contain: layout;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    /* 移除过渡动画效果 */
    /* 添加圆角效果，与容器保持一致 */
    border-radius: 12px;
    /* 增强阴影效果，使其更明显 */
    box-shadow:
        0 4px 15px rgba(0, 0, 0, 0.05),
        0 2px 10px rgba(0, 0, 0, 0.07);
    border: none;
    /* 确保图片完全填充容器 */
    display: block;
    /* 防止图片变形和溢出 */
    max-width: 100%;
    max-height: 100%;
    /* 确保图片渲染质量 */
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* 移除 card-img hover 缩放效果 */



/* 响应式设计 */
@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2xl);
    }

    .feature-card-header {
        /* 减少下内边距，保持其他方向的内边距 */
        padding: var(--space-2xl) var(--space-2xl) var(--space-md) var(--space-2xl);
    }

    .feature-card-title {
        font-size: var(--text-3xl);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-3xl);
        padding: 0;
    }

    .feature-card-image {
        aspect-ratio: 4/5; /* 保持4:5纵向比例 */
        /* 增加margin为阴影留出空间 */
        margin: var(--space-lg) var(--space-lg) var(--space-xl) var(--space-lg);
        /* 增加padding为阴影留出更多空间 */
        padding: var(--space-xs);
        background: transparent;
    }

    .feature-card-title {
        font-size: var(--text-xl);
    }
}

@media (min-width: 1200px) {
    .features-grid {
        max-width: 1400px;
    }
}

/* 移动端优化 */
@media (max-width: 767px) {
    .features-grid {
        padding: 0 var(--space-md);
        gap: var(--space-md);
    }

    .feature-card-header {
        /* 减少下内边距，保持其他方向的内边距 */
        padding: var(--space-lg) var(--space-lg) var(--space-xs) var(--space-lg);
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--space-sm);
    }

    .feature-card-title {
        font-size: var(--text-xl);
        flex: 1;
        margin-right: var(--space-sm);
    }

    .detail-steps-btn {
        font-size: var(--text-xs);
        padding: var(--space-xs) var(--space-sm);
        flex-shrink: 0;
        white-space: nowrap;
    }

    .feature-card-image {
        aspect-ratio: 4/5; /* 保持4:5纵向比例 */
        /* 增加margin为阴影留出空间 */
        margin: var(--space-lg) var(--space-lg) var(--space-xl) var(--space-lg);
        /* 增加padding为阴影留出更多空间 */
        padding: var(--space-xs);
        background: transparent;
        /* 移动端特殊优化 */
        min-height: 0; /* 防止flex容器最小高度问题 */
        flex-shrink: 0; /* 防止容器被压缩 */
    }

    /* 移动端图片特殊优化 */
    .card-img {
        /* 保持cover以填充整个容器 */
        object-fit: cover;
        object-position: center;
        /* 确保图片完全填充容器 */
        width: 100%;
        height: 100%;
        /* 防止图片变形 */
        flex-shrink: 0;
        /* 优化移动端渲染 */
        transform: translateZ(0);
        -webkit-transform: translateZ(0);
        /* 防止图片闪烁 */
        -webkit-backface-visibility: hidden;
        backface-visibility: hidden;
    }


}

/* 详细步骤模态框样式 */
.step-detail-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-detail-modal.show {
    opacity: 1;
    visibility: visible;
}

.step-detail-modal .modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.step-detail-modal .modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-detail-modal.show .modal-content {
    transform: translate(-50%, -50%) scale(1);
}

.step-detail-modal .modal-header {
    padding: var(--space-xl);
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.05), rgba(16, 185, 129, 0.05));
    border-bottom: 1px solid rgba(34, 197, 94, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.step-detail-modal .modal-header h3 {
    margin: 0;
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(135deg, #1e293b, #22c55e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-detail-modal .modal-close-btn {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    line-height: 1;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-detail-modal .modal-close-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.step-detail-modal .modal-body {
    padding: var(--space-xl);
    max-height: 60vh;
    overflow-y: auto;
}

.step-detail-modal .step-list {
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: step-counter;
}

.step-detail-modal .step-list li {
    counter-increment: step-counter;
    position: relative;
    padding: var(--space-md) 0 var(--space-md) var(--space-3xl);
    border-left: 2px solid rgba(34, 197, 94, 0.1);
    margin-left: var(--space-lg);
}

.step-detail-modal .step-list li:not(:last-child) {
    margin-bottom: var(--space-md);
}

.step-detail-modal .step-list li::before {
    content: counter(step-counter);
    position: absolute;
    left: -13px;
    top: var(--space-md);
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    font-weight: 600;
    box-shadow: 0 2px 4px rgba(34, 197, 94, 0.2);
}

.step-detail-modal .step-list li:last-child {
    border-left-color: transparent;
}

.step-detail-modal .modal-footer {
    padding: var(--space-lg) var(--space-xl);
    background: rgba(249, 250, 251, 0.5);
    border-top: 1px solid rgba(229, 231, 235, 0.5);
    text-align: center;
}

.step-detail-modal .modal-btn {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
    border: none;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(34, 197, 94, 0.2);
    min-width: 120px;
}

.step-detail-modal .modal-btn:hover {
    background: linear-gradient(135deg, #16a34a, #15803d);
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(34, 197, 94, 0.3);
}

.step-detail-modal .modal-btn:active {
    transform: translateY(0);
}

/* 移动端模态框优化 */
@media (max-width: 767px) {
    .step-detail-modal .modal-content {
        width: 95%;
        max-height: 85vh;
    }

    .step-detail-modal .modal-header {
        padding: var(--space-lg);
    }

    .step-detail-modal .modal-header h3 {
        font-size: var(--text-lg);
    }

    .step-detail-modal .modal-body {
        padding: var(--space-lg);
    }

    .step-detail-modal .step-list li {
        padding-left: var(--space-2xl);
        margin-left: var(--space-md);
    }

    .step-detail-modal .step-list li::before {
        left: -11px;
        width: 20px;
        height: 20px;
        font-size: var(--text-xs);
    }

    .step-detail-modal .modal-footer {
        padding: var(--space-md) var(--space-lg);
    }

    .step-detail-modal .modal-btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: var(--text-sm);
    }
}



/* 分类头部 */
.category-header {
    width: 100%;
    padding: var(--space-xl);
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    text-align: left;
    transition: all var(--duration-normal) ease;
    position: relative;
    min-height: 80px;
}

.category-header:hover {
    background: var(--gray-50);
}

.category-header:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

.category-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.icon-emoji {
    font-size: 1.5rem;
    line-height: 1;
}

.category-info {
    flex: 1;
    min-width: 0;
}

.category-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-xs) 0;
    line-height: 1.3;
}

.category-subtitle {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0 0 var(--space-md) 0;
    line-height: 1.4;
}

.category-status {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--space-sm);
}

.feature-badge {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--bg-primary);
    transition: all var(--duration-normal) ease;
    box-shadow: var(--shadow-sm);
}

.expand-arrow {
    transition: transform var(--duration-normal) ease;
    color: var(--text-secondary);
}

.feature-category.expanded .expand-arrow {
    transform: rotate(180deg);
}

/* 分类内容区域 */
.category-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-slow) ease-out;
    background: var(--gray-50);
}

.feature-category.expanded .category-content {
    max-height: 2000px;
}

/* 功能展示区域 */
.feature-showcase {
    padding: var(--space-xl);
}

.showcase-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
}

.showcase-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-md) 0;
    line-height: 1.3;
}

.showcase-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* 功能列表展示 */
.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--duration-normal) ease;
}

.feature-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-image {
    order: 1;
}

.feature-details {
    order: 2;
}

.feature-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.feature-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-sm) 0;
    line-height: 1.3;
}

.feature-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.feature-highlights {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.highlight-tag {
    padding: var(--space-xs) var(--space-sm);
    background: var(--primary-light);
    color: var(--primary-dark);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: 600;
}

/* 功能网格展示 */
.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.feature-card {
    background: #F3FCF8;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    /* 移除过渡动画效果 */
}

/* 移除 feature-card hover 效果 */

.card-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.card-content {
    padding: var(--space-lg);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-sm) 0;
    line-height: 1.3;
}

.card-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 功能亮点网格 */
.feature-highlights-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.highlight-item {
    text-align: center;
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--duration-normal) ease;
}

.highlight-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.highlight-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    display: block;
}

.highlight-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-sm) 0;
    line-height: 1.3;
}

.highlight-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 功能优势展示 */
.feature-benefits {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.benefit-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--duration-normal) ease;
}

.benefit-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.benefit-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.benefit-content {
    flex: 1;
}

.benefit-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-xs) 0;
    line-height: 1.3;
}

.benefit-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* 安全特性展示 */
.security-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.security-item {
    text-align: center;
    padding: var(--space-xl);
    background: linear-gradient(135deg, var(--bg-primary), var(--gray-50));
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: all var(--duration-normal) ease;
    position: relative;
    overflow: hidden;
}

.security-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
}

.security-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.security-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-lg);
    display: block;
}

.security-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-md) 0;
    line-height: 1.3;
}

.security-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.step-detail {
    display: none;
    animation: fadeIn var(--duration-normal) ease-in;
}

.step-detail.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    font-weight: 700;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

.step-info {
    flex: 1;
}

.step-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-xs) 0;
    line-height: 1.3;
}

.step-time {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
    background: var(--gray-100);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    display: inline-block;
}

/* 步骤内容布局 */
.step-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.step-image {
    order: 1;
}

.step-details {
    order: 2;
}

.tutorial-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: transform var(--duration-normal) ease;
}

.tutorial-img:hover {
    transform: scale(1.02);
}

.step-desc {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

.step-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.step-list li {
    position: relative;
    padding: var(--space-sm) 0 var(--space-sm) var(--space-xl);
    color: var(--text-secondary);
    line-height: 1.5;
    border-left: 2px solid var(--gray-200);
    margin-bottom: var(--space-sm);
    transition: all var(--duration-normal) ease;
}

.step-list li:last-child {
    margin-bottom: 0;
}

.step-list li::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-color);
    transition: all var(--duration-normal) ease;
}

.step-list li:hover {
    border-left-color: var(--primary-color);
    color: var(--text-primary);
}

.step-list li:hover::before {
    background: var(--primary-dark);
    transform: translateY(-50%) scale(1.2);
}

/* 步骤操作按钮 */
.step-actions {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--gray-200);
}

.step-complete-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: var(--success-color);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    min-height: 44px;
}

.step-complete-btn:hover {
    background: var(--success-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.step-complete-btn:active {
    transform: translateY(0);
}

.step-complete-btn.completed {
    background: var(--gray-400);
    cursor: not-allowed;
}

.step-complete-btn.completed:hover {
    background: var(--gray-400);
    transform: none;
    box-shadow: none;
}

/* 占位符内容 */
.category-placeholder {
    padding: var(--space-xl);
    text-align: center;
    color: var(--text-tertiary);
    font-style: italic;
}

/* 快速操作区域 */
.tutorial-actions {
    margin-top: var(--space-2xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    text-decoration: none;
    min-height: 48px;
    white-space: nowrap;
}

.action-btn.primary {
    background: var(--primary-color);
    color: var(--bg-primary);
    border-color: var(--primary-color);
}

.action-btn.primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.action-btn.secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--gray-300);
}

.action-btn.secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.action-btn:active {
    transform: translateY(0);
}

.action-btn svg {
    transition: transform var(--duration-normal) ease;
}

.action-btn:hover svg {
    transform: scale(1.1);
}

/* ===== 响应式设计 ===== */

/* 平板端优化 */
@media (min-width: 768px) {
    .category-header {
        padding: var(--space-2xl);
        min-height: 100px;
    }

    .category-icon {
        width: 80px;
        height: 80px;
    }

    .icon-emoji {
        font-size: 2rem;
    }

    .category-title {
        font-size: var(--text-2xl);
    }

    .feature-item {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2xl);
    }

    .feature-image {
        order: 2;
    }

    .feature-details {
        order: 1;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .feature-highlights-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .security-features {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 桌面端优化 */
@media (min-width: 1024px) {
    .features-section {
        padding: var(--space-5xl) 0;
    }

    .category-header {
        padding: var(--space-3xl);
        min-height: 120px;
    }

    .category-icon {
        width: 100px;
        height: 100px;
    }

    .icon-emoji {
        font-size: 2.5rem;
    }

    .category-title {
        font-size: var(--text-3xl);
    }

    .category-subtitle {
        font-size: var(--text-base);
    }

    .feature-item {
        gap: var(--space-3xl);
    }

    .showcase-title {
        font-size: var(--text-3xl);
    }

    .showcase-desc {
        font-size: var(--text-lg);
    }
}

/* 大屏幕优化 */
@media (min-width: 1280px) {
    .features-accordion {
        max-width: 1200px;
        margin: 0 auto;
    }

    .feature-item {
        grid-template-columns: 2fr 3fr;
    }

    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .category-header:hover {
        background: transparent;
    }

    .step-nav-item:hover {
        background: var(--bg-primary);
        border-color: var(--gray-200);
    }

    .step-list li:hover {
        border-left-color: var(--gray-200);
        color: var(--text-secondary);
    }

    .step-list li:hover::before {
        background: var(--primary-color);
        transform: translateY(-50%) scale(1);
    }

    .action-btn:hover {
        transform: none;
        box-shadow: none;
    }

    .action-btn.primary:hover {
        background: var(--primary-color);
        border-color: var(--primary-color);
    }

    .action-btn.secondary:hover {
        background: var(--bg-primary);
        border-color: var(--gray-300);
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .tutorial-category {
        border-width: 2px;
    }

    .category-icon {
        border: 2px solid var(--text-primary);
    }

    .step-dot {
        border: 1px solid var(--text-primary);
    }

    .step-list li::before {
        border: 1px solid var(--bg-primary);
    }
}

/* 减少动画模式支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .tutorial-img:hover {
        transform: none;
    }

    .action-btn:hover {
        transform: none;
    }

    .step-complete-btn:hover {
        transform: none;
    }
}

.sidebar-header {
    padding: var(--space-xl);
    border-bottom: 1px solid var(--gray-200);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-inverse);
}

.sidebar-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.tutorial-progress {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--text-inverse);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width var(--duration-slow) ease-out;
}

.progress-text {
    font-size: var(--text-sm);
    font-weight: 600;
    opacity: 0.9;
}

/* 侧边栏导航项 */
.tutorial-nav-sidebar {
    padding: var(--space-md);
}

.tutorial-nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    width: 100%;
    padding: var(--space-lg);
    margin-bottom: var(--space-sm);
    background: transparent;
    border: 2px solid transparent;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    text-align: left;
    position: relative;
    overflow: hidden;
}

.tutorial-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left var(--duration-slow) ease;
}

.tutorial-nav-item:hover::before {
    left: 100%;
}

.tutorial-nav-item:hover {
    border-color: var(--primary-light);
    background: var(--gray-50);
    transform: translateX(4px);
}

.tutorial-nav-item.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-color: var(--primary-color);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.tutorial-nav-item.active .nav-item-title,
.tutorial-nav-item.active .nav-item-subtitle {
    color: var(--text-inverse);
}

.tutorial-nav-item:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.nav-item-icon {
    font-size: var(--text-2xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
    transition: all var(--duration-normal) ease;
}

.tutorial-nav-item.active .nav-item-icon {
    background: rgba(255, 255, 255, 0.2);
}

.nav-item-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.nav-item-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--duration-normal) ease;
}

.nav-item-subtitle {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    transition: color var(--duration-normal) ease;
}

.nav-item-progress {
    margin-top: var(--space-xs);
}

.step-indicators {
    display: flex;
    gap: var(--space-xs);
}

.step-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gray-300);
    transition: background var(--duration-normal) ease;
}

.tutorial-nav-item.active .step-dot {
    background: rgba(255, 255, 255, 0.6);
}

.step-dot.completed {
    background: var(--accent-color);
}

.tutorial-nav-item.active .step-dot.completed {
    background: var(--text-inverse);
}

.nav-item-arrow {
    color: var(--text-tertiary);
    transition: all var(--duration-normal) ease;
    opacity: 0;
}

.tutorial-nav-item:hover .nav-item-arrow {
    opacity: 1;
    transform: translateX(4px);
}

.tutorial-nav-item.active .nav-item-arrow {
    color: var(--text-inverse);
    opacity: 1;
}

/* 侧边栏底部 */
.sidebar-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.quick-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.quick-action-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
}

.quick-action-btn:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 移动端粘性导航 */
.tutorial-nav-mobile {
    position: sticky;
    top: 60px; /* 考虑移动端导航栏高度 */
    z-index: 100;
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    margin-bottom: var(--space-xl);
    width: 100%;
}

.mobile-nav-container {
    position: relative;
    overflow: hidden;
    width: 100%;
}

.mobile-nav-tabs {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: var(--space-md);
    gap: var(--space-sm);
    width: 100%;
    box-sizing: border-box;
}

.mobile-nav-tabs::-webkit-scrollbar {
    display: none;
}

.mobile-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-lg);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    white-space: nowrap;
    /* 修改：允许标签收缩以适应小屏幕 */
    flex-shrink: 1;
    flex-grow: 1;
    flex-basis: 0;
    min-width: 80px;
    max-width: 120px;
    min-height: 64px; /* 增加触摸区域 */
    scroll-snap-align: center;
    position: relative;
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
}

.mobile-tab:hover {
    background: var(--gray-100);
}

.mobile-tab.active {
    color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(99, 102, 241, 0.08));
}

.mobile-tab:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.mobile-tab-icon {
    font-size: var(--text-xl);
    transition: transform var(--duration-normal) ease;
    line-height: 1;
}

.mobile-tab.active .mobile-tab-icon {
    transform: scale(1.15);
}

.mobile-tab-title {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--text-secondary);
    transition: color var(--duration-normal) ease;
    line-height: 1.2;
    text-align: center;
}

.mobile-tab.active .mobile-tab-title {
    color: var(--primary-color);
    font-weight: 700;
}

/* 移动端导航指示器 - 暂时隐藏，因为相关功能不完整 */
.mobile-nav-indicator {
    display: none !important;
}

/* 主要内容区域 */
.tutorial-content-area {
    position: relative;
    min-height: 600px;
    width: 100%;
    overflow: hidden; /* 防止内容溢出 */
}

.tutorial-contents {
    position: relative;
    width: 100%;
    min-height: 400px;
}

.tutorial-content {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--duration-normal) ease-out;
    width: 100%;
    box-sizing: border-box;
}

.tutorial-content.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

/* 移动端内容区域优化 */
@media (max-width: 767px) {
    .tutorial-content-area {
        min-height: 500px;
        padding: 0;
        width: 100%;
        overflow-x: hidden; /* 防止水平滚动 */
    }

    .tutorial-contents {
        padding: 0 var(--space-md);
        width: 100%;
        box-sizing: border-box;
    }

    .tutorial-content {
        padding: 0;
        width: 100%;
        box-sizing: border-box;
    }

    /* 确保教程步骤在移动端正确显示 */
    .tutorial-step {
        margin-bottom: var(--space-lg);
        padding: var(--space-lg);
    }

    .step-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .step-header {
        flex-wrap: wrap;
        gap: var(--space-md);
    }
}

/* 内容切换动画 */
.tutorial-content.fade-in {
    animation: fadeInContent var(--duration-normal) ease-out forwards;
}

.tutorial-content.fade-out {
    animation: fadeOutContent var(--duration-normal) ease-out forwards;
}

@keyframes fadeInContent {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOutContent {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

.tutorial-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
    background: var(--bg-primary);
    padding: var(--space-2xl);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
}

.tutorial-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.tutorial-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 教程步骤样式 */
.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

.tutorial-step {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    transition: all var(--duration-normal) ease;
}

.tutorial-step:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.step-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-inverse);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.step-info {
    flex: 1;
}

.step-title {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.step-time {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    background: var(--gray-100);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.step-content {
    display: grid;
    gap: var(--space-xl);
}

.step-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--gray-100);
}

.tutorial-img {
    width: 100%;
    height: auto;
    display: block;
    min-height: 200px;
    object-fit: cover;
    transition: transform var(--duration-normal) ease;
}

.tutorial-img:hover {
    transform: scale(1.02);
}

.step-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.step-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.7;
}

.step-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.step-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-base);
    color: var(--text-secondary);
    padding: var(--space-sm) var(--space-md);
    background: var(--gray-50);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.step-list li::before {
    content: '✓';
    color: var(--accent-color);
    font-weight: 700;
    font-size: var(--text-sm);
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    color: var(--text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 10px;
}

/* ===== AA约酒特色功能展示区域 ===== */
.aa-features-section {
    padding: calc(var(--space-6xl) + var(--space-2xl)) 0;
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 50%, #15803d 100%);
    position: relative;
    overflow: hidden;
}

/* 动画背景矩形 */
.aa-features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 60% 60%, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

/* 动画矩形元素 */
.aa-features-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
}

/* 动画矩形 - 大矩形 */
.aa-features-section .animated-rect-1 {
    position: absolute;
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    top: 10%;
    left: 5%;
    animation: rotateFloat1 30s linear infinite;
    pointer-events: none;
}

/* 动画矩形 - 中矩形 */
.aa-features-section .animated-rect-2 {
    position: absolute;
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    top: 60%;
    right: 8%;
    animation: rotateFloat2 25s linear infinite reverse;
    pointer-events: none;
}

/* 动画矩形 - 小矩形 */
.aa-features-section .animated-rect-3 {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    top: 30%;
    right: 15%;
    animation: rotateFloat3 35s linear infinite;
    pointer-events: none;
}

/* 动画矩形 - 小矩形2 */
.aa-features-section .animated-rect-4 {
    position: absolute;
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    bottom: 20%;
    left: 12%;
    animation: rotateFloat4 40s linear infinite reverse;
    pointer-events: none;
}

/* 动画关键帧定义 */
@keyframes rotateFloat1 {
    0% {
        transform: rotate(0deg) translateY(0px);
    }
    25% {
        transform: rotate(90deg) translateY(-10px);
    }
    50% {
        transform: rotate(180deg) translateY(0px);
    }
    75% {
        transform: rotate(270deg) translateY(10px);
    }
    100% {
        transform: rotate(360deg) translateY(0px);
    }
}

@keyframes rotateFloat2 {
    0% {
        transform: rotate(0deg) translateX(0px);
    }
    25% {
        transform: rotate(90deg) translateX(15px);
    }
    50% {
        transform: rotate(180deg) translateX(0px);
    }
    75% {
        transform: rotate(270deg) translateX(-15px);
    }
    100% {
        transform: rotate(360deg) translateX(0px);
    }
}

@keyframes rotateFloat3 {
    0% {
        transform: rotate(0deg) translate(0px, 0px);
    }
    25% {
        transform: rotate(90deg) translate(8px, -8px);
    }
    50% {
        transform: rotate(180deg) translate(0px, 0px);
    }
    75% {
        transform: rotate(270deg) translate(-8px, 8px);
    }
    100% {
        transform: rotate(360deg) translate(0px, 0px);
    }
}

@keyframes rotateFloat4 {
    0% {
        transform: rotate(0deg) translateY(0px) scale(1);
    }
    33% {
        transform: rotate(120deg) translateY(-12px) scale(1.05);
    }
    66% {
        transform: rotate(240deg) translateY(12px) scale(0.95);
    }
    100% {
        transform: rotate(360deg) translateY(0px) scale(1);
    }
}

.aa-features-section .section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    position: relative;
    z-index: 1;
}

.aa-features-section .section-title {
    color: #ffffff;
    font-size: var(--text-4xl);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.aa-features-section .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--text-xl);
    font-weight: 500;
    max-width: 600px;
    margin: 0 auto;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* AA功能卡片网格布局 */
.aa-features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-3xl);
    max-width: 1400px; /* 增大最大宽度 */
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* AA功能卡片样式 */
.aa-feature-card {
    background: rgb(245, 245, 245); /* 修改为浅灰色背景 */
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-2xl);
    padding: var(--space-3xl); /* 增大内边距 */
    box-shadow:
        0 15px 35px -5px rgba(0, 0, 0, 0.2),
        0 10px 15px -5px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--duration-normal) var(--ease-out-cubic);
    position: relative;
    overflow: hidden;
    z-index: 2;
}



/* 移除 aa-feature-card hover 效果 */



/* AA功能卡片图片区域 */
.aa-feature-image {
    margin-bottom: var(--space-xl);
    position: relative;
    border-radius: 16px; /* 添加圆角，比图片圆角稍大 */
    overflow: visible; /* 改为visible以显示阴影 */
    aspect-ratio: 3/2; /* 改为更宽的横向比例，提供更好的视觉展示效果 */
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    width: 100%;

    box-shadow: 0 0 20px 5px rgba(0, 0, 0, 0.08);
    transition: box-shadow var(--duration-normal) ease;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
    border-radius: 16px; /* 添加圆角，与容器保持一致 */
}

.aa-feature-card .feature-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px; /* 保持圆角 */
    transition: transform var(--duration-normal) ease, box-shadow var(--duration-normal) ease;

    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
    border: none;
    cursor: pointer;
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(34, 197, 94, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--duration-normal) ease;
    pointer-events: none;
}

.overlay-icon {
    font-size: 3rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}



/* 移除 aa-feature-card 图片 hover 缩放效果 */

/* 移除 aa-feature-image hover 阴影效果 */

/* AA功能卡片内容区域 */
.aa-feature-content {
    text-align: center;
}

.feature-icon-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #22c55e, #10b981);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 8px 16px rgba(34, 197, 94, 0.3);
    transition: all var(--duration-normal) ease;
}

.feature-icon img {
    width: 24px;
    height: 24px;
    /* 确保SVG图标正确显示为白色 */
    filter: brightness(0) invert(1);
    /* 防止图片拖拽 */
    user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
}

.aa-feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 24px rgba(34, 197, 94, 0.4);
}

.aa-feature-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    line-height: 1.3;
}

.aa-feature-description {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-lg);
}

/* 功能亮点标签 */
.feature-highlights {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.highlight-tag {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(16, 185, 129, 0.1));
    color: #22c55e;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    border: 1px solid rgba(34, 197, 94, 0.2);
    transition: all var(--duration-fast) ease;
}

/* 移除 highlight-tag hover 效果 */

/* AA功能卡片入场动画 */
.aa-feature-card {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.aa-feature-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* 为不同卡片添加延迟动画 */
.aa-feature-card:nth-child(1) {
    transition-delay: 0.1s;
}

.aa-feature-card:nth-child(2) {
    transition-delay: 0.2s;
}

.aa-feature-card:nth-child(3) {
    transition-delay: 0.3s;
}

/* 图片懒加载效果 */
.aa-feature-card .feature-img {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.aa-feature-card .feature-img.loaded {
    opacity: 1;
}



/* 大图查看模态框样式 */
.image-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease;
}

.image-modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    margin: auto;
    animation: zoomIn 0.3s ease;
}

.image-modal-content img {
    width: 100%;
    height: auto;
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.image-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.image-modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* 移动端优化 */
@media (max-width: 768px) {
    .image-modal-content {
        max-width: 95%;
        max-height: 95%;
    }

    .image-modal-close {
        top: -35px;
        font-size: 28px;
        width: 35px;
        height: 35px;
    }
}

/* CTA区域 - 现代化设计 */
.cta-section {
    position: relative;
    padding: var(--space-3xl) 0;
    overflow: hidden;
}

.cta-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.cta-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg,
        #2c3e50 0%,      /* 深蓝灰色 - 左上角 */
        #34495e 20%,     /* 蓝灰色 */
        #2c5530 40%,     /* 深绿灰色 */
        #1e4d3e 60%,     /* 深绿色 */
        #0d4f3c 80%,     /* 更深绿色 */
        #0a3d2e 100%     /* 最深绿色 - 右下角 */
    );
    overflow: hidden;
}

/* 添加格子图案层 */
.cta-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        /* 主网格线 */
        linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px),
        /* 细网格线 */
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        /* 添加一些光点效果 */
        radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.04) 0%, transparent 50%);
    background-size:
        60px 60px,
        60px 60px,
        20px 20px,
        20px 20px,
        120px 120px,
        180px 180px;
    opacity: 0.5;
}

.cta-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
}

.cta-gradient::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
}









/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    .cta-gradient::before,
    .cta-gradient::after {
        animation: none;
        opacity: 0.4;
    }
}



.cta-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(245, 158, 11, 0.1) 0%, transparent 50%);
    background-size: 300px 300px, 200px 200px;
}

.cta-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--text-inverse);
    max-width: 800px;
    margin: 0 auto;
}

.cta-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: var(--space-xl);
    font-size: var(--text-sm);
    font-weight: 600;
}

.cta-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
}

.cta-desc {
    font-size: var(--text-xl);
    margin-bottom: var(--space-2xl);
    opacity: 0.9;
    line-height: 1.6;
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.feature-icon {
    font-size: var(--text-lg);
}

.feature-text {
    font-size: var(--text-base);
    font-weight: 500;
    white-space: nowrap;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-2xl);
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    text-decoration: none;
    white-space: nowrap;
}

.cta-btn.primary {
    background: var(--text-inverse);
    color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.cta-btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    background: var(--gray-50);
}

.cta-btn.secondary {
    background: transparent;
    color: var(--text-inverse);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cta-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.cta-trust {
    text-align: center;
}

.trust-text {
    font-size: var(--text-lg);
    margin-bottom: var(--space-lg);
    opacity: 0.8;
}

.trust-text strong {
    color: var(--secondary-color);
    font-weight: 700;
}

.trust-badges {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.trust-badge {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.badge-label {
    font-size: var(--text-sm);
    font-weight: 500;
}

/* 小程序推广样式 */
.qr-code-container {
    display: flex;
    justify-content: center;
    margin: var(--space-1xl) 0;
}

.qr-code {
    width: 150px;
    height: 150px;
}

.wechat-search {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
}

.wechat-icon {
    width: 32px;
    height: 32px;
}

.wechat-text {
    font-size: var(--text-xl);
    font-weight: 500;
    color: var(--text-inverse);
}

.search-container {
    display: flex;
    justify-content: center;
    margin-top: var(--space-xl);
}

.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    padding: var(--space-xs) var(--space-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    min-width: 180px;
    justify-content: space-between;
}

.search-icon {
    width: 20px;
    height: 20px;
    opacity: 0.6;
}

.search-content {
    align-items: center;
    flex: 1;
    justify-content: flex-end;
}

.search-text {
    font-size: var(--text-base);
    color: var(--gray-700);
}

.search-cursor {
    font-size: var(--text-base);
    color: #10b981;
    animation: blink 1s infinite;
    font-weight: 300;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* 小程序推广响应式样式 */
@media (max-width: 768px) {
    .qr-code {
        width: 150px;
        height: 150px;
    }

    .wechat-text {
        font-size: var(--text-lg);
    }

    .search-box {
        min-width: 160px;
        padding: var(--space-xs) var(--space-md);
    }

    .search-text,
    .search-cursor {
        font-size: var(--text-sm);
    }

    .search-content {
        justify-content: flex-end;
    }
}

/* 极小屏手机 (最大360px) - 进一步优化AA功能卡片 */
@media (max-width: 360px) {
    .aa-feature-card {
        /* 在极小屏幕上减小卡片宽度 */
        flex: 0 0 300px !important;
        min-width: 300px !important;
        max-width: 300px !important;
    }

    .aa-features-grid {
        /* 重新计算padding：50vw - (300/2 + 16/2) = 50vw - 158px */
        padding: var(--space-lg) calc(50vw - 158px) calc(var(--space-lg) + 20px) calc(50vw - 158px) !important;
        gap: 12px !important; /* 在极小屏幕上稍微减小间距 */
    }
}

/* 中等小屏手机 (361px - 480px) - 优化AA功能卡片 */
@media (min-width: 361px) and (max-width: 480px) {
    .aa-feature-card {
        /* 中等屏幕使用稍大的卡片 */
        flex: 0 0 320px !important;
        min-width: 320px !important;
        max-width: 320px !important;
    }

    .aa-features-grid {
        /* 重新计算padding：50vw - (320/2 + 16/2) = 50vw - 168px */
        padding: var(--space-lg) calc(50vw - 168px) calc(var(--space-lg) + 20px) calc(50vw - 168px) !important;
        gap: 14px !important; /* 中等间距 */
    }
}

@media (max-width: 480px) {
    .qr-code {
        width: 150px;
        height: 150px;
    }

    .search-box {
        min-width: 160px;
    }

    .search-content {
        justify-content: flex-end;
    }
}

/* 页脚 - 现代化设计 */
.footer {
    background: var(--gray-900);
    color: var(--text-inverse);
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-1xl);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.footer-logo-img {
    width: 48px;
    height: 48px;
    border-radius: 50%; /* 圆形logo */
    background: transparent; /* 确保背景透明 */
}

.footer-brand-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-brand-name {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-inverse);
}

.footer-brand-desc {
    font-size: var(--text-sm);
    color: var(--gray-400);
}

.footer-description {
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--gray-300);
}

.footer-links-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-xl);
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-column-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-inverse);
    margin-bottom: var(--space-sm);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-link {
    color: var(--gray-400);
    text-decoration: none;
    font-size: var(--text-base);
    transition: color var(--duration-fast) ease;
    padding: var(--space-xs) 0;
}

.footer-link:hover {
    color: var(--primary-light);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--gray-700);
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-copyright {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-copyright p {
    color: var(--gray-500);
    font-size: var(--text-sm);
    margin: 0;
}

.footer-copyright a {
    color: var(--gray-500);
    text-decoration: none;
}

.footer-copyright a:hover,
.footer-copyright a:visited,
.footer-copyright a:active {
    color: var(--gray-500);
    text-decoration: none;
}

.footer-social {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.social-text {
    color: var(--gray-400);
    font-size: var(--text-sm);
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: var(--radius-lg);
    color: var(--gray-400);
    text-decoration: none;
    transition: all var(--duration-normal) ease;
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: translateY(-2px);
}

/* 现代化响应式设计 - 移动端优先 */

/* 小屏手机 (320px - 480px) */
@media (max-width: 480px) {
    body {
        padding-top: 50px; /* 小屏幕下调整为较小的导航栏高度 */
    }

    /* 移动端隐藏装饰性绿色条 */
    .feature-item::before,
    .feature-item:hover::before,
    .feature-item.expanded::before {
        display: none !important;
    }

    .container {
        padding: 0 var(--space-md);
    }

    /* 小屏幕下的导航栏优化 */
    .mobile-nav {
        box-shadow: 0 1px 5px rgba(0, 0, 0, 0.4); /* 小屏幕下减少阴影 */
    }

    .nav-container {
        padding: var(--space-xs) var(--space-sm); /* 减少内边距 */
        height: 50px; /* 减少高度 */
    }

    .nav-brand {
        font-size: var(--text-base); /* 减小字体 */
    }

    .nav-logo-img {
        width: 28px; /* 减小logo尺寸 */
        height: 28px;
    }

    .nav-menu-btn {
        width: 28px; /* 减小按钮尺寸 */
        height: 28px;
    }

    .menu-line {
        width: 18px; /* 减小线条长度 */
    }

    .hero-content {
        padding: var(--space-lg) var(--space-md);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .stat-divider {
        width: 100%;
        height: 1px;
    }

    .hero-cta {
        flex-direction: column;
        gap: var(--space-md);
    }

    .cta-primary,
    .cta-secondary {
        width: 100%;
        justify-content: center;
    }

    /* 确保主卡片图标在小屏设备上居中 */
    .main-card-icon {
        align-self: center !important;
        margin: 0 auto !important;
    }

    /* 小屏设备feature-item进一步优化 */
    .feature-header {
        padding: var(--space-sm) var(--space-md) !important;
        min-height: 52px !important;
    }

    .feature-item.collapsed .feature-header {
        padding: var(--space-xs) var(--space-md) !important;
        min-height: 48px !important;
    }

    .feature-arrow {
        min-height: 28px !important;
        min-width: 28px !important;
        padding: var(--space-xs) !important;
    }

    /* 小屏设备feature-title强制垂直居中 */
    .feature-title {
        margin: 0 !important;
        padding: 0 !important;
        display: flex !important;
        align-items: center !important;
        line-height: 1.3 !important;
    }

    .feature-info {
        align-items: center !important;
        min-height: 40px !important;
        height: 100% !important;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .advantage-main-card {
        padding: var(--space-xl);
    }

    .main-card-header {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
        align-items: center;
    }

    .main-card-icon {
        align-self: center;
        margin: 0 auto;
    }

    /* 移动端教程区域优化 */
    .tutorial-nav-mobile {
        top: 50px; /* 减少顶部间距 */
        margin-bottom: var(--space-lg);
    }

    .mobile-nav-tabs {
        padding: var(--space-sm) var(--space-md);
        gap: var(--space-xs);
    }

    .mobile-tab {
        min-width: 75px;
        min-height: 60px;
        padding: var(--space-sm);
    }

    .mobile-tab-icon {
        font-size: var(--text-base);
    }

    .mobile-tab-title {
        font-size: 10px;
    }

    .mobile-nav-indicator {
        width: 75px;
        left: var(--space-md);
    }

    .tutorial-step {
        padding: var(--space-lg);
    }

    .step-header {
        flex-direction: column;
        text-align: center;
        gap: var(--space-md);
    }

    .step-content {
        grid-template-columns: 1fr;
    }

    .step-number {
        width: 48px;
        height: 48px;
        font-size: var(--text-lg);
    }

    /* AA功能区域移动端优化 */
    .aa-features-section {
        padding: 60px 0;
    }

    .aa-features-section .section-title {
        font-size: var(--text-3xl);
    }

    .aa-features-section .section-subtitle {
        font-size: var(--text-lg);
    }

    /* 移动端减少动画元素 */
    .aa-features-section .animated-rect-3,
    .aa-features-section .animated-rect-4 {
        display: none;
    }

    .aa-features-section .animated-rect-1 {
        width: 120px;
        height: 120px;
        animation-duration: 40s;
    }

    .aa-features-section .animated-rect-2 {
        width: 100px;
        height: 100px;
        animation-duration: 35s;
    }

    /* AA功能区域移动端水平滚动 - 参考Cursor官网的三卡片布局 */
    .aa-features-grid {
        display: flex !important;
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
        scroll-behavior: smooth;
        -webkit-overflow-scrolling: touch;
        scroll-snap-type: x mandatory;
        /* 参考Cursor官网的卡片间距 - 使用更合适的间距 */
        gap: 16px;
        /* 优化padding，确保第一个和最后一个卡片都能居中显示，参考container-full布局 */
        /* 计算公式：50vw - (卡片宽度/2 + gap/2) = 50vw - (336/2 + 16/2) = 50vw - 176px */
        padding: var(--space-lg) calc(50vw - 176px) calc(var(--space-lg) + 20px) calc(50vw - 176px);
        margin: 0 !important;
        width: 100vw;
        position: relative;
        left: 50%;
        transform: translateX(-50%);
        min-height: fit-content;
        /* 隐藏滚动条但保持功能 */
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .aa-features-grid::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Opera */
    }

    .aa-feature-card {
        /* 参考embla__slide的尺寸设置，优化卡片宽度 */
        flex: 0 0 336px;
        min-width: 336px;
        max-width: 336px;
        height: auto;
        scroll-snap-align: center; /* 居中对齐 */
        /* 确保卡片完整显示 */
        box-sizing: border-box;
        overflow: hidden;
        /* 优化触摸体验 */
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
        /* 添加卡片间的视觉分离 */
        margin-right: 0; /* 移除额外的margin，使用gap控制间距 */
        padding: var(--space-xl);
    }

    /* 移除滚动提示渐变 */
    .aa-features-section::after {
        display: none;
    }

    /* 为容器优化，确保卡片完整显示 */
    .aa-features-section {
        position: relative;
        overflow: visible; /* 完全允许内容溢出显示 */
        padding-bottom: calc(var(--space-2xl) + 20px); /* 增加底部padding为阴影留空间 */
    }

    /* 确保section内的container不限制grid的滚动 */
    .aa-features-section .container {
        overflow: visible;
        position: relative;
    }

    /* 隐藏左侧的动画矩形元素 */
    .aa-features-section .animated-rect-1,
    .aa-features-section .animated-rect-2,
    .aa-features-section .animated-rect-3,
    .aa-features-section .animated-rect-4 {
        display: none;
    }

    .aa-feature-title {
        font-size: var(--text-xl);
    }

    .aa-feature-description {
        font-size: var(--text-base);
    }

    .feature-icon {
        width: 50px;
        height: 50px;
    }
}

/* 大屏手机 (481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
    .hero-stats {
        gap: var(--space-lg);
    }

    .advantages-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .tutorial-nav {
        justify-content: flex-start;
    }

    .step-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    /* AA功能区域大屏手机优化 - 重置为网格布局 */
    .aa-features-grid {
        display: grid !important;
        flex-direction: initial;
        overflow-x: visible;
        overflow-y: visible;
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        padding: 0;
        margin: 0 auto;
        scrollbar-width: auto;
        -ms-overflow-style: auto;
    }

    .aa-features-grid::-webkit-scrollbar {
        display: block;
    }

    .aa-feature-card {
        flex: initial;
        min-width: initial;
        max-width: initial;
        width: 100%;
        scroll-snap-align: initial;
    }

    /* 移除滚动提示 */
    .aa-features-section::after {
        display: none;
    }

    .aa-features-section {
        position: relative;
        overflow: hidden; /* 确保内容不会溢出 */
    }

    /* 隐藏动画矩形元素 */
    .aa-features-section .animated-rect-1,
    .aa-features-section .animated-rect-2,
    .aa-features-section .animated-rect-3,
    .aa-features-section .animated-rect-4 {
        display: none;
    }
}

/* 平板设备 (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tutorial-nav {
        justify-content: center;
        flex-wrap: wrap;
    }

    .step-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl);
        align-items: start;
    }

    /* AA功能区域平板端优化 - 两列布局，重置移动端样式 */
    .aa-features-grid {
        display: grid !important;
        flex-direction: initial;
        overflow-x: visible;
        overflow-y: visible;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2xl);
        padding: 0;
        margin: 0 auto;
        scrollbar-width: auto;
        -ms-overflow-style: auto;
    }

    .aa-features-grid::-webkit-scrollbar {
        display: block;
    }

    .aa-feature-card {
        flex: initial;
        min-width: initial;
        max-width: initial;
        width: 100%;
        scroll-snap-align: initial;
    }

    .aa-feature-card:last-child {
        grid-column: 1 / -1; /* 第三个卡片占满整行 */
        max-width: 600px;
        margin: 0 auto;
    }

    /* 移除滚动提示 */
    .aa-features-section::after {
        display: none;
    }

    .aa-features-section {
        position: relative;
        overflow: hidden; /* 确保内容不会溢出 */
    }

    /* 隐藏动画矩形元素 */
    .aa-features-section .animated-rect-1,
    .aa-features-section .animated-rect-2,
    .aa-features-section .animated-rect-3,
    .aa-features-section .animated-rect-4 {
        display: none;
    }
}

/* 桌面设备 (1025px+) */
@media (min-width: 1025px) {
    .hero-content {
        max-width: 800px;
    }

    .advantages-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .tutorial-nav {
        justify-content: center;
        flex-wrap: wrap;
    }

    /* AA功能区域桌面端优化 - 三列布局，重置移动端样式 */
    .aa-features-section {
        padding: calc(var(--space-6xl) + var(--space-3xl)) 0;
        position: relative;
        overflow: hidden; /* 确保内容不会溢出 */
    }

    .aa-features-section::after {
        display: none;
    }

    /* 隐藏动画矩形元素 */
    .aa-features-section .animated-rect-1,
    .aa-features-section .animated-rect-2,
    .aa-features-section .animated-rect-3,
    .aa-features-section .animated-rect-4 {
        display: none;
    }

    .aa-features-grid {
        display: grid !important;
        flex-direction: initial;
        overflow-x: visible;
        overflow-y: visible;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-3xl);
        padding: 0;
        margin: 0 auto;
        scrollbar-width: auto;
        -ms-overflow-style: auto;
    }

    .aa-features-grid::-webkit-scrollbar {
        display: block;
    }

    .aa-feature-card {
        flex: initial;
        min-width: initial;
        max-width: initial;
        width: 100%;
        scroll-snap-align: initial;
    }

    .aa-feature-card:hover {
        transform: translateY(-12px) scale(1.03);
    }

    .step-content {
        grid-template-columns: 300px 1fr;
        gap: var(--space-2xl);
        align-items: start;
    }

    .step-image {
        position: sticky;
        top: var(--space-xl);
    }
}

/* 超大屏幕 (1440px+) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }

    .hero-content {
        max-width: 900px;
    }
}

/* 横屏模式优化 */
@media (orientation: landscape) and (max-height: 500px) {
    .hero-section {
        min-height: auto;
        padding: var(--space-2xl) 0;
    }
}

/* 高分辨率屏幕优化 */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .tutorial-img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* 触摸设备优化 */
.touch-device .mobile-tab {
    -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
    -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
}

.touch-device .mobile-tab:active {
    background: rgba(99, 102, 241, 0.1);
    transform: scale(0.98);
}

/* 确保移动端导航在所有设备上正确显示 */
@media (max-width: 767px) {
    .tutorial-container {
        grid-template-columns: 1fr !important;
        gap: 0 !important;
    }

    .tutorial-nav-mobile {
        display: block !important;
        position: sticky !important;
        top: 60px !important;
        z-index: 100 !important;
        background: var(--bg-primary) !important;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important;
        border-radius: 0 0 var(--radius-xl) var(--radius-xl) !important;
        margin-bottom: var(--space-xl) !important;
        width: 100% !important;
    }

    .tutorial-sidebar {
        display: none !important;
    }

    .tutorial-content-area {
        width: 100% !important;
        padding: 0 !important;
    }

    .tutorial-contents {
        padding: 0 var(--space-md) !important;
    }
}

/* 最终强制性移动端样式 - 确保在所有情况下都生效 */
@media screen and (max-width: 767px) {
    .desktop-only,
    .tutorial-sidebar {
        display: none !important;
        visibility: hidden !important;
    }

    .mobile-only,
    .tutorial-nav-mobile {
        display: block !important;
        visibility: visible !important;
    }
}

/* 针对特定移动设备的样式 */
@media screen and (max-width: 480px) {
    .tutorial-nav-mobile {
        top: 50px !important;
    }

    .mobile-nav-tabs {
        padding: var(--space-sm) var(--space-md) !important;
        gap: var(--space-xs) !important;
    }

    .mobile-tab {
        min-width: 70px !important;
        max-width: 100px !important;
        min-height: 60px !important;
        padding: var(--space-sm) !important;
    }

    .mobile-tab-title {
        font-size: 0.625rem !important; /* 10px */
    }

    .mobile-tab-icon {
        font-size: 1rem !important; /* 16px */
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --text-tertiary: #9ca3af;
        --bg-primary: #1f2937;
        --bg-secondary: #111827;
        --bg-tertiary: #374151;
        --gray-100: #374151;
        --gray-200: #4b5563;
    }
}

/* 可访问性支持 */

/* 焦点指示器 */
.tutorial-nav-item:focus,
.mobile-tab:focus,
.quick-action-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .tutorial-nav-item {
        border-width: 3px;
    }

    .tutorial-nav-item.active {
        border-color: var(--text-inverse);
        background: var(--text-primary);
    }

    .mobile-tab.active {
        background: var(--text-primary);
        color: var(--text-inverse);
    }
}

/* 屏幕阅读器支持 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 跳过链接 */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--text-inverse);
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--duration-normal) ease;
}

.skip-link:focus {
    top: 6px;
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .hero-pattern {
        animation: none;
    }

    .tutorial-nav-item::before {
        transition: none;
    }

    .mobile-nav-indicator {
        transition: none;
    }

    .tutorial-content {
        transition: none;
    }

    .fadeInContent,
    .fadeOutContent {
        animation: none;
    }
}

/* 弹窗样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--space-md);
    animation: fadeIn var(--duration-normal) ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp var(--duration-normal) ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl) var(--space-xl) var(--space-lg);
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) ease;
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-lg) var(--space-xl) var(--space-xl);
}

/* 入驻表单样式 */
.join-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    padding: var(--space-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    transition: border-color var(--duration-fast) ease;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.submit-btn {
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-size: var(--text-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--duration-normal) ease;
    margin-top: var(--space-md);
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 联系信息样式 */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
}

.contact-icon {
    font-size: var(--text-2xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    border-radius: var(--radius-lg);
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--space-xs) 0;
}

.contact-details p {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin: 0 0 var(--space-xs) 0;
    font-weight: 500;
}

.contact-details small {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

/* 打印样式 */
@media print {
    .mobile-nav,
    .back-to-top,
    .modal-overlay {
        display: none !important;
    }

    .hero-section {
        min-height: auto;
        page-break-after: always;
    }

    .tutorial-step {
        page-break-inside: avoid;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 移动端卡片激活动画 */
@keyframes mobileCardActivate {
    0% {
        transform: translateY(0) scale(1);
        box-shadow: var(--shadow-sm);
        border-color: var(--gray-200);
    }
    50% {
        transform: translateY(-4px) scale(1.02);
        box-shadow: var(--shadow-md);
    }
    100% {
        transform: translateY(-8px) scale(1);
        box-shadow: var(--shadow-xl);
        border-color: var(--primary-color);
    }
}

.advantage-card {
    /* 桌面端设置动画初始状态，移动端会被覆盖 */
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.6s ease forwards;
}

/* 只在桌面端使用动画 */
@media (min-width: 768px) {
    .advantage-card {
        opacity: 0;
        transform: translateY(30px);
    }
}

.advantage-card:nth-child(1) { animation-delay: 0.1s; }
.advantage-card:nth-child(2) { animation-delay: 0.2s; }
.advantage-card:nth-child(3) { animation-delay: 0.3s; }
.advantage-card:nth-child(4) { animation-delay: 0.4s; }

/* 移动端激活状态下的动画优先级 */
@media (max-width: 767px) {
    .advantage-card.mobile-activated {
        animation: mobileCardActivate 0.6s ease forwards !important;
    }
}

/* 图片占位符样式 */
img[src*="placeholder"] {
    background: linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
                linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
                linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
                linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    background-color: #e9ecef;
}

/* 懒加载图片效果 */
.tutorial-img {
    transition: opacity 0.3s ease;
}

.tutorial-img.loading {
    opacity: 0.5;
}

.tutorial-img.loaded {
    opacity: 1;
}