/* =====================================================
   51视频 (bddupk.cn) - 主样式表
   原创设计 · 日系动漫主题 · 移动端优先
   ===================================================== */

/* ---- CSS变量 ---- */
:root {
    --color-primary: #5B3A8F;
    --color-secondary: #FF6B9D;
    --color-accent: #4ECDC4;
    --color-gold: #FFD700;
    --color-bg: #0D0D1A;
    --color-bg-card: #1A1A2E;
    --color-bg-light: #F8F4FF;
    --color-border: rgba(255,255,255,0.08);
    --color-text: #E8E8E8;
    --color-text-muted: #9B9BB4;
    --color-text-dark: #1A1A2E;
    --gradient-main: linear-gradient(135deg, #FF6B9D 0%, #5B3A8F 100%);
    --gradient-secondary: linear-gradient(135deg, #4ECDC4 0%, #44A08D 100%);
    --gradient-gold: linear-gradient(135deg, #FFD700 0%, #FF8C00 100%);
    --gradient-dark: linear-gradient(135deg, #1A1A2E 0%, #0D0D1A 100%);
    --gradient-card: linear-gradient(135deg, rgba(91,58,143,0.15) 0%, rgba(255,107,157,0.08) 100%);
    --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-hover: 0 16px 48px rgba(91,58,143,0.4);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

/* ---- 重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ---- 工具类 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.mt-32 { margin-top: 32px; }
.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.article-content p { margin-bottom: 16px; color: var(--color-text-muted); font-size: 15px; line-height: 1.8; }
.article-content h2 { font-size: 20px; font-weight: 700; color: var(--color-text); margin: 24px 0 12px; }

/* ---- 动画 ---- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slideRight {
    from { transform: translateX(100vw); }
    to { transform: translateX(-100%); }
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
.animate-fadeInUp { animation: fadeInUp 0.6s ease forwards; opacity: 1 !important; }

/* ---- 顶部公告栏 ---- */
.top-bar {
    background: var(--gradient-main);
    color: #fff;
    text-align: center;
    padding: 8px 20px;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}
.top-bar a {
    background: rgba(255,255,255,0.25);
    border: 1px solid rgba(255,255,255,0.4);
    border-radius: 20px;
    padding: 3px 14px;
    font-size: 12px;
    font-weight: 600;
    transition: var(--transition);
}
.top-bar a:hover { background: rgba(255,255,255,0.4); }

/* ---- 导航栏 ---- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13,13,26,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}
.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 24px;
}
.navbar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.navbar-logo img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: cover;
}
.brand-text {
    font-size: 20px;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
}
.navbar-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.navbar-nav a {
    display: block;
    padding: 8px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}
.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--color-secondary);
    background: rgba(255,107,157,0.1);
}
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}
.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ---- 搜索栏 ---- */
.search-bar-wrap {
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}
.search-bar-inner {
    max-width: 700px;
    margin: 0 auto;
    padding: 0 20px;
}
.search-input-group {
    display: flex;
    gap: 0;
    border-radius: 28px;
    overflow: hidden;
    border: 1.5px solid var(--color-border);
    background: var(--color-bg);
    transition: var(--transition);
}
.search-input-group:focus-within {
    border-color: var(--color-secondary);
    box-shadow: 0 0 0 3px rgba(255,107,157,0.15);
}
.search-input-group input {
    flex: 1;
    background: none;
    border: none;
    padding: 12px 20px;
    font-size: 14px;
    color: var(--color-text);
    outline: none;
}
.search-input-group input::placeholder { color: var(--color-text-muted); }
.search-btn {
    background: var(--gradient-main);
    border: none;
    padding: 12px 24px;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.search-btn:hover { opacity: 0.9; }
.search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 20px 0;
    max-width: 700px;
    margin: 0 auto;
}
.search-tags span {
    font-size: 12px;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 3px 10px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: var(--transition);
}
.search-tags span:hover {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
    background: rgba(255,107,157,0.08);
}

/* ---- 面包屑 ---- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 0;
    font-size: 13px;
    color: var(--color-text-muted);
}
.breadcrumb a { color: var(--color-secondary); }
.breadcrumb a:hover { text-decoration: underline; }

/* ---- Hero Banner ---- */
.hero-banner {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(13,13,26,0.9) 0%, rgba(91,58,143,0.6) 50%, rgba(13,13,26,0.8) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    padding: 80px 0;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,107,157,0.15);
    border: 1px solid rgba(255,107,157,0.4);
    border-radius: 24px;
    padding: 6px 16px;
    font-size: 13px;
    color: var(--color-secondary);
    margin-bottom: 20px;
}
.live-dot {
    width: 8px;
    height: 8px;
    background: var(--color-secondary);
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}
.hero-title {
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 900;
    line-height: 1.15;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: -1px;
}
.hero-title .highlight {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 560px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}
.hero-stats {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}
.hero-stat-item {}
.hero-stat-num {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
    line-height: 1;
}
.hero-stat-label {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
    margin-top: 4px;
}

/* ---- 按钮 ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 28px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    white-space: nowrap;
}
.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: 0 4px 20px rgba(255,107,157,0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(255,107,157,0.6);
}
.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}
.btn-outline:hover {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
    background: rgba(255,107,157,0.08);
}
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* ---- 统计区 ---- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.stat-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}
.stat-card:hover { transform: translateY(-4px); border-color: var(--color-secondary); }
.stat-num {
    font-size: 32px;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 8px;
}
.stat-label { font-size: 13px; color: var(--color-text-muted); }

/* ---- Section ---- */
.section { padding: 80px 0; }
.section-dark { background: var(--color-bg); }
.section-light { background: var(--color-bg-light); }
.section-light .section-title,
.section-light .section-desc,
.section-light .stat-num,
.section-light .stat-label,
.section-light .feature-title,
.section-light .feature-desc,
.section-light .partner-name,
.section-light .community-title,
.section-light .community-desc,
.section-light .community-count,
.section-light .step-title,
.section-light .step-desc,
.section-light .section-tag,
.section-light .article-content p,
.section-light .article-content h2 {
    color: var(--color-text-dark) !important;
    -webkit-text-fill-color: var(--color-text-dark);
}
.section-light .gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-light .stat-num {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-light .feature-card {
    background: #fff;
    border-color: rgba(91,58,143,0.12);
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
.section-light .feature-card:hover { box-shadow: 0 12px 40px rgba(91,58,143,0.15); }
.section-light .community-card {
    background: #fff;
    border-color: rgba(91,58,143,0.12);
}
.section-light .step-card { background: #fff; border-color: rgba(91,58,143,0.12); }
.section-light .partner-item { background: #fff; border-color: rgba(91,58,143,0.12); }
.section-light .video-card { background: #fff; border-color: rgba(91,58,143,0.12); }
.section-light .video-title { color: var(--color-text-dark) !important; }
.section-light .breadcrumb { color: #666; }
.section-gradient {
    background: linear-gradient(135deg, #1A1A2E 0%, #0D0D1A 40%, #1A1A2E 100%);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}
.section-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--color-secondary);
    margin-bottom: 12px;
    text-transform: uppercase;
}
.section-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 16px;
    line-height: 1.2;
}
.section-title span {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-desc {
    font-size: 15px;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ---- 视频卡片 ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.video-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(255,107,157,0.3);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-card:hover .play-icon { transform: scale(1.1); }
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--color-bg);
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.4);
    opacity: 0;
    transition: var(--transition);
}
.play-icon {
    width: 56px;
    height: 56px;
    background: rgba(255,107,157,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(255,107,157,0.5);
}
.play-icon svg { width: 24px; height: 24px; fill: #fff; margin-left: 3px; }
.video-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--gradient-main);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 12px;
}
.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 6px;
}
.video-info { padding: 16px; }
.video-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.5;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.video-stats { display: flex; gap: 12px; }
.video-stat {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--color-text-muted);
}
.video-stat svg { width: 12px; height: 12px; fill: var(--color-text-muted); }
.video-tag {
    font-size: 11px;
    color: var(--color-secondary);
    background: rgba(255,107,157,0.1);
    padding: 2px 8px;
    border-radius: 8px;
    border: 1px solid rgba(255,107,157,0.2);
}

/* ---- 功能卡片 ---- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: var(--transition);
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,107,157,0.3);
    box-shadow: var(--shadow-hover);
}
.feature-icon {
    font-size: 36px;
    margin-bottom: 16px;
    display: block;
}
.feature-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
}
.feature-desc {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ---- 社区卡片 ---- */
.community-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.community-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}
.community-card:hover {
    transform: translateY(-4px);
    border-color: rgba(78,205,196,0.4);
    box-shadow: 0 12px 40px rgba(78,205,196,0.2);
}
.community-icon { font-size: 40px; display: block; margin-bottom: 16px; }
.community-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
}
.community-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 12px;
}
.community-count {
    font-size: 12px;
    color: var(--color-accent);
    font-weight: 600;
}

/* ---- 专家卡片 ---- */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.expert-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
}
.expert-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,215,0,0.3);
    box-shadow: 0 12px 40px rgba(255,215,0,0.15);
}
.expert-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 16px;
    border: 3px solid var(--color-secondary);
    box-shadow: 0 4px 20px rgba(255,107,157,0.3);
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.expert-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 4px;
}
.expert-title {
    font-size: 13px;
    color: var(--color-secondary);
    margin-bottom: 12px;
    font-weight: 500;
}
.expert-bio {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 16px;
}
.expert-awards {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 16px;
}
.award-badge {
    font-size: 11px;
    background: rgba(255,215,0,0.1);
    border: 1px solid rgba(255,215,0,0.3);
    color: var(--color-gold);
    padding: 3px 10px;
    border-radius: 12px;
}
.expert-actions { display: flex; gap: 8px; justify-content: center; }

/* ---- 合作伙伴 ---- */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 16px;
}
.partner-item {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 12px;
    text-align: center;
    transition: var(--transition);
}
.partner-item:hover {
    transform: translateY(-3px);
    border-color: var(--color-secondary);
}
.partner-logo {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    color: #fff;
    margin: 0 auto 8px;
}
.partner-name { font-size: 12px; color: var(--color-text-muted); }

/* ---- 步骤 ---- */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.step-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}
.step-card:hover { transform: translateY(-4px); border-color: rgba(78,205,196,0.4); }
.step-num {
    width: 52px;
    height: 52px;
    background: var(--gradient-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 800;
    color: #fff;
    margin: 0 auto 16px;
}
.step-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 10px;
}
.step-desc { font-size: 13px; color: var(--color-text-muted); line-height: 1.6; }

/* ---- 评价卡片 ---- */
.review-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.review-card {
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: var(--transition);
}
.review-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255,215,0,0.3);
    box-shadow: 0 12px 40px rgba(255,215,0,0.1);
}
.review-stars {
    font-size: 18px;
    color: var(--color-gold);
    margin-bottom: 14px;
    letter-spacing: 2px;
}
.review-text {
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}
.review-author {
    display: flex;
    align-items: center;
    gap: 12px;
}
.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}
.review-info .name {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
}
.review-info .date { font-size: 12px; color: var(--color-text-muted); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}
.section-light .faq-item { background: #fff; }
.faq-item.open { border-color: var(--color-secondary); }
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    transition: var(--transition);
    user-select: none;
}
.section-light .faq-question { color: var(--color-text-dark); }
.faq-question:hover { color: var(--color-secondary); }
.faq-icon {
    font-size: 20px;
    font-weight: 400;
    color: var(--color-secondary);
    transition: var(--transition);
    flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.8;
    padding: 0 24px;
}
.section-light .faq-answer { color: #555; }
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }

/* ---- 联系区域 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}
.contact-icon { font-size: 24px; flex-shrink: 0; }
.contact-text { display: flex; flex-direction: column; gap: 2px; }
.contact-text strong { font-size: 13px; color: var(--color-text-muted); font-weight: 500; }
.contact-text span { font-size: 15px; color: var(--color-text); font-weight: 600; }

/* ---- 热门标签 ---- */
.hot-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.hot-tag {
    font-size: 13px;
    padding: 6px 16px;
    border-radius: 20px;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition);
    background: var(--gradient-card);
}
.hot-tag:hover {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
    background: rgba(255,107,157,0.08);
}

/* ---- 弹幕 ---- */
.danmaku-container {
    position: relative;
    height: 60px;
    overflow: hidden;
    margin-bottom: 24px;
    pointer-events: none;
}
.danmaku-item {
    position: absolute;
    right: 0;
    white-space: nowrap;
    font-size: 14px;
    font-weight: 500;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.8);
    animation: slideRight linear forwards;
    pointer-events: none;
}

/* ---- 分页 ---- */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}
.page-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 14px;
    transition: var(--transition);
    cursor: pointer;
}
.page-btn:hover,
.page-btn.active {
    background: var(--gradient-main);
    color: #fff;
    border-color: transparent;
}

/* ---- 页面Banner ---- */
.page-banner {
    background: linear-gradient(135deg, #1A1A2E 0%, #5B3A8F 50%, #1A1A2E 100%);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255,107,157,0.15) 0%, transparent 70%);
}
.page-banner-title {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    position: relative;
}
.page-banner-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    position: relative;
}

/* ---- 轮播 ---- */
.carousel { position: relative; overflow: hidden; border-radius: var(--radius-lg); }
.carousel-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.carousel-slide { flex: 0 0 100%; }
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    background: rgba(0,0,0,0.5);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    z-index: 5;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
.carousel-btn:hover { background: var(--color-secondary); }
.carousel-btn.prev { left: 12px; }
.carousel-btn.next { right: 12px; }
.carousel-dots {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 5;
}
.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    cursor: pointer;
    transition: var(--transition);
}
.carousel-dot.active {
    background: var(--color-secondary);
    width: 20px;
    border-radius: 4px;
}

/* ---- 分享栏 ---- */
.share-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.share-label { font-size: 13px; color: var(--color-text-muted); }
.share-btn {
    padding: 6px 16px;
    border-radius: 20px;
    border: 1px solid var(--color-border);
    background: var(--gradient-card);
    color: var(--color-text-muted);
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition);
}
.share-btn:hover { border-color: var(--color-secondary); color: var(--color-secondary); }

/* ---- 底部 ---- */
.footer {
    background: #080812;
    border-top: 1px solid var(--color-border);
    padding-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 32px;
}
.footer-brand .brand-name {
    font-size: 24px;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}
.footer-brand p {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 20px;
}
.footer-social { display: flex; gap: 10px; }
.footer-social a {
    width: 36px;
    height: 36px;
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: var(--transition);
}
.footer-social a:hover { border-color: var(--color-secondary); transform: translateY(-2px); }
.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
    font-size: 13px;
    color: var(--color-text-muted);
    transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--color-secondary); }
.qrcode-grid { display: flex; gap: 32px; justify-content: center; }
.qrcode-item { text-align: center; }
.qrcode-box {
    width: 120px;
    height: 120px;
    background: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 8px;
    padding: 8px;
}
.qrcode-label { font-size: 12px; color: var(--color-text-muted); line-height: 1.5; }
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-bottom-left { font-size: 13px; color: var(--color-text-muted); }
.update-time { font-size: 12px; color: var(--color-text-muted); margin-top: 4px; }
.footer-bottom-right { display: flex; gap: 20px; }
.footer-bottom-right a {
    font-size: 12px;
    color: var(--color-text-muted);
    transition: var(--transition);
}
.footer-bottom-right a:hover { color: var(--color-secondary); }

/* ---- Toast ---- */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: rgba(26,26,46,0.95);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 28px;
    padding: 12px 24px;
    font-size: 14px;
    z-index: 9999;
    opacity: 0;
    transition: all 0.3s ease;
    white-space: nowrap;
    max-width: 90vw;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* =====================================================
   移动端适配 (Mobile First)
   ===================================================== */
@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .partner-grid { grid-template-columns: repeat(4, 1fr); }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .section { padding: 48px 0; }
    .hero-banner { min-height: 480px; }
    .hero-content { padding: 60px 0; }
    .hero-stats { gap: 20px; }
    .hero-stat-num { font-size: 22px; }

    /* 导航移动端 */
    .mobile-menu-btn { display: flex; }
    .navbar-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(13,13,26,0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 12px;
        gap: 4px;
    }
    .navbar-nav.open { display: flex; }
    .navbar-nav a { padding: 12px 16px; font-size: 15px; }
    .navbar { position: sticky; }

    /* 网格 */
    .video-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .feature-grid { grid-template-columns: 1fr; gap: 16px; }
    .community-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .expert-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .steps-grid { grid-template-columns: 1fr; gap: 16px; }
    .review-grid { grid-template-columns: 1fr; gap: 16px; }
    .partner-grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .footer-bottom-right { flex-wrap: wrap; justify-content: center; }

    /* AI区域 */
    #ai .container > div,
    #community .container > div:first-child,
    .contact-grid { grid-template-columns: 1fr !important; }

    .section-title { font-size: 26px; }
    .hero-title { font-size: 32px; }
    .hero-actions { flex-direction: column; align-items: flex-start; }
    .hero-actions .btn { width: 100%; max-width: 280px; }

    .search-tags { padding: 8px 20px 0; }
    .top-bar { font-size: 12px; flex-direction: column; gap: 6px; padding: 10px; }
}

@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .community-grid { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: 1fr; }
    .partner-grid { grid-template-columns: repeat(4, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-stats { gap: 16px; }
    .hero-stat-num { font-size: 20px; }
    .btn-lg { padding: 14px 28px; font-size: 15px; }
    .section-title { font-size: 22px; }
    .page-banner { padding: 40px 0; }
    .page-banner-title { font-size: 28px; }
    .qrcode-grid { flex-direction: column; align-items: center; }
}

/* ---- 打印样式 ---- */
@media print {
    .top-bar, .navbar, .search-bar-wrap, .footer { display: none; }
    body { background: #fff; color: #000; }
}