/* =============================================
   91 修车改装 - 主样式文件
   网站：fzurfcl.cn
   ============================================= */

/* CSS变量 */
:root {
    --primary: #E8410A;
    --primary-dark: #c23508;
    --secondary: #1A2540;
    --accent: #F5A623;
    --dark: #0D1117;
    --dark2: #161B27;
    --dark3: #1E2535;
    --gray: #8B929E;
    --light: #F0F2F5;
    --white: #FFFFFF;
    --border: rgba(255,255,255,0.08);
    --shadow: 0 4px 24px rgba(0,0,0,0.35);
    --radius: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
    --font-main: 'PingFang SC', 'Microsoft YaHei', '微软雅黑', sans-serif;
}

/* 重置与基础 */
*, *::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(--dark);
    color: #D0D6E0;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* =============================================
   顶部公告栏
   ============================================= */
.top-bar {
    background: var(--primary);
    color: #fff;
    text-align: center;
    padding: 6px 20px;
    font-size: 13px;
    letter-spacing: 0.5px;
}
.top-bar a { color: #fff; text-decoration: underline; }

/* =============================================
   导航栏
   ============================================= */
.site-header {
    background: rgba(13,17,23,0.97);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 20px;
}
.logo-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.logo-wrap img {
    width: 48px;
    height: 48px;
    object-fit: contain;
}
.logo-text {
    font-size: 22px;
    font-weight: 900;
    color: var(--white);
    letter-spacing: 1px;
}
.logo-text span { color: var(--primary); }
.logo-sub {
    font-size: 11px;
    color: var(--gray);
    display: block;
    margin-top: -2px;
    letter-spacing: 2px;
}

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
    color: #C8D0DC;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 6px;
    white-space: nowrap;
    transition: var(--transition);
    position: relative;
}
.main-nav a:hover,
.main-nav a.active {
    color: var(--white);
    background: rgba(232,65,10,0.15);
}
.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

/* 搜索框 */
.header-search {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.07);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 6px 16px;
    gap: 8px;
    min-width: 200px;
    transition: var(--transition);
}
.header-search:focus-within {
    border-color: var(--primary);
    background: rgba(232,65,10,0.08);
}
.header-search input {
    background: none;
    border: none;
    outline: none;
    color: var(--white);
    font-size: 13px;
    width: 100%;
    font-family: var(--font-main);
}
.header-search input::placeholder { color: var(--gray); }
.header-search button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray);
    font-size: 15px;
    padding: 0;
    transition: var(--transition);
}
.header-search button:hover { color: var(--primary); }

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
    background: var(--dark2);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
}
.breadcrumb-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--gray);
}
.breadcrumb-inner a { color: var(--gray); }
.breadcrumb-inner a:hover { color: var(--primary); }
.breadcrumb-inner .sep { color: rgba(255,255,255,0.2); }
.breadcrumb-inner .current { color: var(--white); }

/* =============================================
   Hero Banner
   ============================================= */
.hero-banner {
    position: relative;
    min-height: 580px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--dark);
}
.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/banner-hero.jpg');
    background-size: cover;
    background-position: center;
    filter: brightness(0.45);
    transform: scale(1.03);
    transition: transform 8s ease;
}
.hero-banner:hover .hero-bg { transform: scale(1); }
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(13,17,23,0.9) 0%, rgba(13,17,23,0.4) 60%, transparent 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1280px;
    margin: 0 auto;
    padding: 80px 24px;
    width: 100%;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(232,65,10,0.2);
    border: 1px solid rgba(232,65,10,0.4);
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.hero-badge::before { content: '●'; color: var(--primary); font-size: 8px; }
.hero-title {
    font-size: clamp(32px, 5vw, 58px);
    font-weight: 900;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}
.hero-title .brand { color: var(--primary); }
.hero-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.75);
    max-width: 560px;
    margin-bottom: 36px;
    line-height: 1.8;
}
.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}
.hero-stat-item { text-align: left; }
.hero-stat-num {
    font-size: 28px;
    font-weight: 900;
    color: var(--white);
    line-height: 1;
}
.hero-stat-num span { color: var(--primary); }
.hero-stat-label { font-size: 12px; color: var(--gray); margin-top: 4px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
    background: var(--primary);
    color: var(--white);
    padding: 13px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,65,10,0.4); }
.btn-outline {
    background: transparent;
    color: var(--white);
    padding: 13px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    border: 1px solid rgba(255,255,255,0.3);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.btn-outline:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }

/* =============================================
   搜索栏（导航下方）
   ============================================= */
.nav-search-bar {
    background: var(--dark2);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
}
.nav-search-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.nav-search-form {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    flex: 1;
    max-width: 640px;
}
.nav-search-form input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--white);
    font-size: 14px;
    padding: 10px 16px;
    font-family: var(--font-main);
}
.nav-search-form input::placeholder { color: var(--gray); }
.nav-search-form button {
    background: var(--primary);
    border: none;
    color: #fff;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
    font-family: var(--font-main);
}
.nav-search-form button:hover { background: var(--primary-dark); }
.search-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-tag {
    font-size: 12px;
    color: var(--gray);
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 14px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.search-tag:hover { color: var(--primary); border-color: var(--primary); }

/* =============================================
   通用容器与布局
   ============================================= */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}
.section { padding: 64px 0; }
.section-sm { padding: 40px 0; }
.section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 36px;
    gap: 16px;
    flex-wrap: wrap;
}
.section-title-wrap { flex: 1; }
.section-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.section-label::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 2px;
    background: var(--primary);
}
.section-title {
    font-size: clamp(22px, 3vw, 32px);
    font-weight: 900;
    color: var(--white);
    line-height: 1.3;
}
.section-title .brand { color: var(--primary); }
.section-desc {
    font-size: 14px;
    color: var(--gray);
    margin-top: 8px;
    max-width: 560px;
}
.view-all {
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
    transition: var(--transition);
}
.view-all:hover { gap: 8px; }
.view-all::after { content: '→'; }

/* =============================================
   视频卡片
   ============================================= */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.video-grid-lg {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}
.video-card {
    background: var(--dark2);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}
.video-card:hover {
    transform: translateY(-4px);
    border-color: rgba(232,65,10,0.3);
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--dark3);
}
.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0);
    transition: background 0.3s ease;
}
.video-card:hover .video-play-btn { background: rgba(0,0,0,0.45); }
.play-icon {
    width: 54px;
    height: 54px;
    background: rgba(232,65,10,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.7);
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(232,65,10,0.5);
}
.video-card:hover .play-icon {
    opacity: 1;
    transform: scale(1);
}
.play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-top: 11px solid transparent;
    border-bottom: 11px solid transparent;
    border-left: 18px solid #fff;
    margin-left: 4px;
}
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 10px;
    background: rgba(0,0,0,0.75);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 4px;
}
.video-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    letter-spacing: 0.5px;
}
.video-badge.hot { background: #E8410A; }
.video-badge.new { background: #27AE60; }
.video-badge.top { background: #8E44AD; }
.video-info { padding: 16px; }
.video-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.video-cat {
    font-size: 11px;
    color: var(--primary);
    font-weight: 600;
    background: rgba(232,65,10,0.12);
    padding: 2px 8px;
    border-radius: 4px;
}
.video-date { font-size: 11px; color: var(--gray); }
.video-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    line-height: 1.45;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-title:hover { color: var(--primary); }
.video-stats {
    display: flex;
    gap: 14px;
    font-size: 12px;
    color: var(--gray);
}
.video-stat { display: flex; align-items: center; gap: 4px; }
.video-stat svg { width: 13px; height: 13px; fill: currentColor; opacity: 0.7; }

/* =============================================
   特色视频（大卡片）
   ============================================= */
.featured-video-wrap {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 24px;
    align-items: start;
}
.featured-main {
    background: var(--dark2);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
}
.featured-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}
.featured-thumb img { width: 100%; height: 100%; object-fit: cover; }
.featured-play {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.3);
    cursor: pointer;
    transition: var(--transition);
}
.featured-play:hover { background: rgba(0,0,0,0.5); }
.featured-play-icon {
    width: 72px;
    height: 72px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 40px rgba(232,65,10,0.6);
    transition: transform 0.3s ease;
}
.featured-play:hover .featured-play-icon { transform: scale(1.1); }
.featured-play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    border-left: 22px solid #fff;
    margin-left: 5px;
}
.featured-info { padding: 20px; }
.featured-title {
    font-size: 20px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 10px;
    line-height: 1.4;
}
.featured-desc { font-size: 14px; color: var(--gray); line-height: 1.7; margin-bottom: 14px; }
.featured-stats { display: flex; gap: 20px; font-size: 13px; color: var(--gray); }

/* 侧边视频列表 */
.side-video-list { display: flex; flex-direction: column; gap: 12px; }
.side-video-item {
    display: flex;
    gap: 12px;
    background: var(--dark2);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}
.side-video-item:hover { border-color: rgba(232,65,10,0.3); transform: translateX(4px); }
.side-thumb {
    width: 120px;
    flex-shrink: 0;
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}
.side-thumb img { width: 100%; height: 100%; object-fit: cover; }
.side-play {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0);
    transition: var(--transition);
}
.side-video-item:hover .side-play { background: rgba(0,0,0,0.4); }
.side-play-icon {
    width: 28px;
    height: 28px;
    background: rgba(232,65,10,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}
.side-video-item:hover .side-play-icon { opacity: 1; }
.side-play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
    border-left: 10px solid #fff;
    margin-left: 2px;
}
.side-info { padding: 10px 12px 10px 0; flex: 1; }
.side-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--white);
    line-height: 1.4;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.side-meta { font-size: 11px; color: var(--gray); }

/* =============================================
   分类标签栏
   ============================================= */
.tab-bar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}
.tab-btn {
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-main);
}
.tab-btn:hover { color: var(--white); border-color: rgba(255,255,255,0.2); }
.tab-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* =============================================
   专家卡片
   ============================================= */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
.expert-card {
    background: var(--dark2);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    transition: var(--transition);
    text-align: center;
}
.expert-card:hover {
    transform: translateY(-4px);
    border-color: rgba(232,65,10,0.3);
    box-shadow: var(--shadow);
}
.expert-avatar {
    position: relative;
    height: 220px;
    overflow: hidden;
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.expert-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(to top, rgba(13,17,23,0.95), transparent);
}
.expert-body { padding: 16px; }
.expert-name {
    font-size: 17px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 4px;
}
.expert-role {
    font-size: 12px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
}
.expert-desc { font-size: 13px; color: var(--gray); line-height: 1.6; margin-bottom: 14px; }
.expert-awards {
    display: flex;
    gap: 6px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 14px;
}
.award-tag {
    font-size: 11px;
    background: rgba(245,166,35,0.15);
    color: var(--accent);
    padding: 3px 8px;
    border-radius: 4px;
    border: 1px solid rgba(245,166,35,0.2);
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm {
    padding: 7px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-main);
    border: none;
}
.btn-sm-primary { background: var(--primary); color: #fff; }
.btn-sm-primary:hover { background: var(--primary-dark); }
.btn-sm-outline { background: transparent; color: var(--gray); border: 1px solid var(--border); }
.btn-sm-outline:hover { color: var(--white); border-color: rgba(255,255,255,0.3); }

/* =============================================
   AI赋能模块
   ============================================= */
.ai-section { background: var(--dark2); }
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.ai-card {
    background: var(--dark3);
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.ai-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition);
}
.ai-card:hover { transform: translateY(-4px); border-color: rgba(232,65,10,0.2); }
.ai-card:hover::before { opacity: 1; }
.ai-icon {
    width: 52px;
    height: 52px;
    background: rgba(232,65,10,0.12);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
    border: 1px solid rgba(232,65,10,0.2);
}
.ai-title {
    font-size: 17px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 10px;
}
.ai-desc { font-size: 14px; color: var(--gray); line-height: 1.7; }
.ai-feature-img {
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 300px;
}
.ai-feature-img img { width: 100%; height: 100%; object-fit: cover; }

/* =============================================
   合作品牌Logo墙
   ============================================= */
.partners-section { background: var(--dark2); }
.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
}
.partner-item {
    background: var(--dark3);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    min-height: 80px;
}
.partner-item:hover { border-color: rgba(232,65,10,0.3); background: rgba(232,65,10,0.05); }
.partner-name {
    font-size: 14px;
    font-weight: 800;
    color: var(--gray);
    letter-spacing: 1px;
    text-align: center;
    transition: var(--transition);
}
.partner-item:hover .partner-name { color: var(--white); }

/* =============================================
   社区加入指南
   ============================================= */
.join-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}
.step-item {
    background: var(--dark2);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border);
    text-align: center;
    position: relative;
}
.step-num {
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    font-size: 18px;
    font-weight: 900;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}
.step-title { font-size: 16px; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--gray); line-height: 1.6; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    background: var(--dark2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,65,10,0.3); }
.faq-q {
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    gap: 12px;
    user-select: none;
}
.faq-q:hover { color: var(--primary); }
.faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(232,65,10,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform 0.3s ease;
    color: var(--primary);
    font-size: 16px;
    font-weight: 700;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-a {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    font-size: 14px;
    color: var(--gray);
    line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 20px 18px; }

/* =============================================
   用户评价
   ============================================= */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.review-card {
    background: var(--dark2);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
}
.review-card:hover { border-color: rgba(232,65,10,0.2); transform: translateY(-2px); }
.review-card::before {
    content: '"';
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 60px;
    color: rgba(232,65,10,0.1);
    font-family: Georgia, serif;
    line-height: 1;
}
.review-stars { color: var(--accent); font-size: 14px; margin-bottom: 12px; }
.review-text { font-size: 14px; color: var(--gray); line-height: 1.8; margin-bottom: 16px; }
.review-user { display: flex; align-items: center; gap: 10px; }
.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 700; color: var(--white); }
.review-label { font-size: 12px; color: var(--gray); }

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}
.contact-info-block {
    background: var(--dark2);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
}
.contact-title {
    font-size: 20px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 18px;
}
.contact-icon {
    width: 40px;
    height: 40px;
    background: rgba(232,65,10,0.12);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--gray); margin-bottom: 3px; }
.contact-value { font-size: 14px; color: var(--white); font-weight: 600; }
.qr-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 24px;
}
.qr-item { text-align: center; }
.qr-item img {
    width: 130px;
    height: 130px;
    object-fit: cover;
    border-radius: 8px;
    margin: 0 auto 8px;
    border: 1px solid var(--border);
}
.qr-label { font-size: 12px; color: var(--gray); }

/* =============================================
   社交分享
   ============================================= */
.share-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.share-label { font-size: 13px; color: var(--gray); }
.share-btn {
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-family: var(--font-main);
    display: flex;
    align-items: center;
    gap: 6px;
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); }

/* =============================================
   底部
   ============================================= */
.site-footer {
    background: var(--dark2);
    border-top: 1px solid var(--border);
    padding: 56px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-desc { font-size: 13px; color: var(--gray); line-height: 1.8; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--gray);
    cursor: pointer;
    transition: var(--transition);
}
.social-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.footer-col-title {
    font-size: 14px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
    font-size: 13px;
    color: var(--gray);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}
.footer-links a::before { content: '›'; color: var(--primary); }
.footer-links a:hover { color: var(--white); padding-left: 4px; }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-copy { font-size: 13px; color: var(--gray); }
.footer-copy a { color: var(--primary); }
.footer-update { font-size: 12px; color: rgba(255,255,255,0.3); }
.footer-icp { font-size: 12px; color: rgba(255,255,255,0.3); }

/* =============================================
   统计数据条
   ============================================= */
.stats-bar {
    background: linear-gradient(135deg, var(--primary) 0%, #c23508 100%);
    padding: 32px 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}
.stat-item { padding: 8px; }
.stat-num {
    font-size: 36px;
    font-weight: 900;
    color: #fff;
    line-height: 1;
    margin-bottom: 6px;
}
.stat-label { font-size: 13px; color: rgba(255,255,255,0.8); }

/* =============================================
   内页头部
   ============================================= */
.page-hero {
    background: var(--dark2);
    padding: 48px 0;
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}
.page-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(232,65,10,0.08) 0%, transparent 70%);
    pointer-events: none;
}
.page-hero-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 900;
    color: var(--white);
    margin-bottom: 10px;
    line-height: 1.2;
}
.page-hero-title .brand { color: var(--primary); }
.page-hero-desc { font-size: 15px; color: var(--gray); max-width: 600px; line-height: 1.7; }

/* =============================================
   分页
   ============================================= */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
    flex-wrap: wrap;
}
.page-btn {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border);
    background: var(--dark2);
    color: var(--gray);
    font-family: var(--font-main);
}
.page-btn:hover, .page-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* =============================================
   通用工具类
   ============================================= */
.text-center { text-align: center; }
.text-white { color: var(--white); }
.text-primary { color: var(--primary); }
.text-gray { color: var(--gray); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.bg-dark2 { background: var(--dark2); }
.bg-dark3 { background: var(--dark3); }
.border-top { border-top: 1px solid var(--border); }
.divider { height: 1px; background: var(--border); margin: 32px 0; }

/* 懒加载占位 */
img[data-src] { opacity: 0; transition: opacity 0.4s ease; }
img.loaded { opacity: 1; }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
    .featured-video-wrap { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .partners-grid { grid-template-columns: repeat(3, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .main-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: var(--dark); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--border); gap: 4px; }
    .main-nav.open { display: flex; }
    .hamburger { display: flex; }
    .header-search { display: none; }
    .hero-banner { min-height: 420px; }
    .hero-stats { gap: 20px; }
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
    .join-steps { grid-template-columns: 1fr 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .search-tags { display: none; }
}

@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: 1fr; }
    .hero-btns { flex-direction: column; }
    .join-steps { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .qr-grid { grid-template-columns: 1fr; }
    .ai-grid { grid-template-columns: 1fr; }
}