/* ====================================
   小马拉大车 - 原创主题样式表
   Brand: 小马拉大车 | Domain: qscmLub.cn
   百度SEO EEAT最佳实践 | 全站中文
   ==================================== */

/* ====================================
   CSS变量 - 原创配色方案
   主色：玫红 #c2185b | 辅色：深紫 #4a148c
   背景：深夜蓝紫 #1a0a2e
   ==================================== */
:root {
    --primary:        #c2185b;
    --primary-light:  #f48fb1;
    --primary-dark:   #880e4f;
    --secondary:      #4a148c;
    --secondary-light:#7b1fa2;
    --accent:         #ff6f00;
    --accent-light:   #ffa726;
    --bg-dark:        #1a0a2e;
    --bg-medium:      #2d1b4e;
    --bg-card:        #3d2460;
    --text-white:     #ffffff;
    --text-light:     #f3e5f5;
    --text-muted:     #ce93d8;
    --border-color:   #6a1b9a;
    --gradient-main:  linear-gradient(135deg, #c2185b 0%, #7b1fa2 50%, #4a148c 100%);
    --gradient-card:  linear-gradient(145deg, #3d2460 0%, #2d1b4e 100%);
    --gradient-hero:  linear-gradient(135deg, rgba(26,10,46,0.92) 0%, rgba(194,24,91,0.65) 100%);
    --shadow-card:    0 8px 32px rgba(194,24,91,0.2);
    --shadow-hover:   0 16px 48px rgba(194,24,91,0.4);
    --radius-sm:      8px;
    --radius-md:      16px;
    --radius-lg:      24px;
    --transition:     all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ====================================
   基础重置
   ==================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.7;
    overflow-x: hidden;
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover { color: var(--accent-light); }

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul { list-style: none; }

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 无障碍隐藏 */
.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* ====================================
   头部导航
   ==================================== */
.site-header {
    background: var(--bg-dark);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 24px rgba(194,24,91,0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 10px;
    padding-bottom: 10px;
    gap: 16px;
}

/* Logo区域：favicon小图标 + 主Logo */
.logo-container a {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-favicon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    flex-shrink: 0;
    filter: drop-shadow(0 0 4px rgba(194,24,91,0.5));
}

.logo-img {
    height: 42px;
    width: auto;
    filter: drop-shadow(0 0 8px rgba(194,24,91,0.6));
}

/* 主导航 */
.main-nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
}

.main-nav ul li a {
    color: var(--text-light);
    font-size: 14px;
    font-weight: 500;
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

.main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0; left: 50%;
    transform: translateX(-50%);
    width: 0; height: 2px;
    background: var(--gradient-main);
    transition: var(--transition);
}

.main-nav ul li a:hover,
.main-nav ul li a.active {
    color: var(--primary-light);
    background: rgba(194,24,91,0.15);
}

.main-nav ul li a:hover::after,
.main-nav ul li a.active::after {
    width: 80%;
}

/* 移动端汉堡按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
}

.nav-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text-light);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 搜索栏 */
.search-bar-container {
    background: var(--bg-medium);
    padding: 8px 0;
    border-top: 1px solid rgba(106,27,154,0.4);
}

.search-box {
    display: flex;
    gap: 10px;
    max-width: 640px;
    margin: 0 auto;
}

.search-input {
    flex: 1;
    background: rgba(255,255,255,0.08);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 9px 20px;
    color: var(--text-white);
    font-size: 14px;
    outline: none;
    transition: var(--transition);
}

.search-input::placeholder { color: var(--text-muted); }

.search-input:focus {
    border-color: var(--primary);
    background: rgba(255,255,255,0.12);
    box-shadow: 0 0 0 3px rgba(194,24,91,0.2);
}

.search-btn {
    background: var(--gradient-main);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 9px 22px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(194,24,91,0.5);
}

/* 面包屑导航 */
.breadcrumb-nav {
    background: rgba(45,27,78,0.6);
    border-bottom: 1px solid rgba(106,27,154,0.3);
    padding: 10px 0;
}

.breadcrumb-inner {
    font-size: 13px;
    color: var(--text-muted);
}

.breadcrumb-inner a {
    color: var(--primary-light);
}

.bc-sep {
    margin: 0 6px;
    color: var(--text-muted);
}

/* ====================================
   Hero 首屏
   ==================================== */
.hero-section {
    position: relative;
    min-height: 580px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/banner_hero2.jpg');
    background-size: cover;
    background-position: center;
    filter: brightness(0.55);
    transform: scale(1.05);
    transition: transform 8s ease;
}

.hero-bg:hover { transform: scale(1.0); }

.hero-overlay {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 80px 0;
}

.hero-content h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.hero-content h2 span {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 620px;
    margin-bottom: 32px;
    opacity: 0.92;
}

.hero-btns {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn-primary {
    background: var(--gradient-main);
    color: white;
    padding: 13px 30px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--text-white);
    padding: 13px 30px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    border: 2px solid rgba(255,255,255,0.5);
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
    text-align: center;
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: var(--primary-light);
    color: var(--primary-light);
    transform: translateY(-3px);
}

.hero-stats {
    display: flex;
    gap: 36px;
    flex-wrap: wrap;
}

.stat-item { text-align: center; }

.stat-num {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--primary-light);
    display: block;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
}

/* ====================================
   区块通用
   ==================================== */
.section { padding: 68px 0; }

.section-alt { background: var(--bg-medium); }

.section-header {
    text-align: center;
    margin-bottom: 44px;
}

.section-tag {
    display: inline-block;
    background: rgba(194,24,91,0.2);
    color: var(--primary-light);
    border: 1px solid var(--primary);
    padding: 4px 16px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2.3rem);
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 12px;
}

.section-title span { color: var(--primary-light); }

.section-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ====================================
   视频卡片（H5/JS实现，鼠标悬停播放按钮）
   ==================================== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: var(--gradient-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(106,27,154,0.4);
    transition: var(--transition);
    cursor: pointer;
}

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

.video-thumb-wrap {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
    background: var(--bg-medium);
}

.video-thumb-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumb-wrap img {
    transform: scale(1.08);
}

/* 播放按钮遮罩（鼠标移入显示） */
.play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.42);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.video-card:hover .play-overlay,
.live-card:hover .play-overlay {
    opacity: 1;
}

.play-btn-icon {
    width: 64px; height: 64px;
    background: rgba(194,24,91,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0.8);
    transition: var(--transition);
    box-shadow: 0 0 30px rgba(194,24,91,0.7);
}

.video-card:hover .play-btn-icon,
.live-card:hover .play-btn-icon {
    transform: scale(1);
}

.play-btn-icon::after {
    content: '';
    width: 0; height: 0;
    border-style: solid;
    border-width: 12px 0 12px 22px;
    border-color: transparent transparent transparent white;
    margin-left: 5px;
}

.video-duration {
    position: absolute;
    bottom: 8px; right: 8px;
    background: rgba(0,0,0,0.75);
    color: white;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
}

.video-tag {
    position: absolute;
    top: 8px; left: 8px;
    background: var(--primary);
    color: white;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.video-info { padding: 14px 16px; }

.video-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 12px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.video-meta span { display: flex; align-items: center; gap: 3px; }

.video-author {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid rgba(106,27,154,0.3);
}

.author-avatar {
    width: 28px; height: 28px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: white;
    font-weight: 700;
    flex-shrink: 0;
}

.author-name { font-size: 12px; color: var(--text-muted); }

/* ====================================
   功能模块卡片
   ==================================== */
.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.module-card {
    background: var(--gradient-card);
    border: 1px solid rgba(106,27,154,0.4);
    border-radius: var(--radius-md);
    padding: 28px 22px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(194,24,91,0.1) 0%, transparent 60%);
    opacity: 0;
    transition: var(--transition);
}

.module-card:hover::before { opacity: 1; }

.module-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--shadow-card);
}

.module-icon {
    width: 62px; height: 62px;
    background: rgba(194,24,91,0.2);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    font-size: 26px;
    border: 1px solid rgba(194,24,91,0.4);
}

.module-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.module-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ====================================
   专家展示（EEAT权威性）
   ==================================== */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.expert-card {
    background: var(--gradient-card);
    border: 1px solid rgba(106,27,154,0.4);
    border-radius: var(--radius-md);
    padding: 26px 22px;
    text-align: center;
    transition: var(--transition);
}

.expert-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.expert-avatar {
    width: 84px; height: 84px;
    border-radius: 50%;
    background: var(--gradient-main);
    margin: 0 auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 800;
    color: white;
    border: 3px solid var(--primary-light);
    box-shadow: 0 0 20px rgba(194,24,91,0.4);
    overflow: hidden;
}

.expert-avatar img {
    width: 100%; height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.expert-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 4px;
}

.expert-title {
    font-size: 12px;
    color: var(--primary-light);
    margin-bottom: 10px;
    font-weight: 600;
}

.expert-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 14px;
}

.expert-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    justify-content: center;
    margin-bottom: 14px;
}

.expert-tag {
    background: rgba(194,24,91,0.2);
    color: var(--primary-light);
    border: 1px solid rgba(194,24,91,0.4);
    padding: 2px 9px;
    border-radius: 50px;
    font-size: 11px;
}

.expert-btns {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.btn-sm {
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-sm-primary { background: var(--gradient-main); color: white; }

.btn-sm-outline {
    background: transparent;
    color: var(--primary-light);
    border: 1px solid var(--primary);
}

.btn-sm:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(194,24,91,0.4);
}

/* ====================================
   合作品牌Logo墙
   ==================================== */
.partner-wall {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
    align-items: center;
}

.partner-item {
    background: var(--gradient-card);
    border: 1px solid rgba(106,27,154,0.4);
    border-radius: var(--radius-sm);
    padding: 14px 24px;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-muted);
    transition: var(--transition);
}

.partner-item:hover {
    border-color: var(--primary);
    color: var(--primary-light);
    transform: translateY(-3px);
}

/* ====================================
   加入社区步骤
   ==================================== */
.join-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.step-item { text-align: center; padding: 22px 14px; }

.step-num {
    width: 46px; height: 46px;
    background: var(--gradient-main);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    color: white;
    margin: 0 auto 12px;
}

.step-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 6px;
}

.step-desc { font-size: 12px; color: var(--text-muted); }

/* ====================================
   FAQ手风琴
   ==================================== */
.faq-list {
    max-width: 820px;
    margin: 0 auto;
}

.faq-item {
    background: var(--gradient-card);
    border: 1px solid rgba(106,27,154,0.4);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover { border-color: var(--primary); }

.faq-question {
    padding: 16px 22px;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-white);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-question::after {
    content: '+';
    font-size: 20px;
    color: var(--primary-light);
    transition: var(--transition);
    flex-shrink: 0;
    margin-left: 12px;
}

.faq-item.open .faq-question::after { transform: rotate(45deg); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-item.open .faq-answer { max-height: 300px; }

.faq-answer p {
    padding: 14px 22px 16px;
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
    border-top: 1px solid rgba(106,27,154,0.3);
}

/* ====================================
   用户评论
   ==================================== */
.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 22px;
}

.review-card {
    background: var(--gradient-card);
    border: 1px solid rgba(106,27,154,0.4);
    border-radius: var(--radius-md);
    padding: 22px;
    transition: var(--transition);
}

.review-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: var(--shadow-card);
}

.review-stars {
    color: #ffa726;
    font-size: 16px;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 14px;
    font-style: italic;
}

.reviewer { display: flex; align-items: center; gap: 10px; }

.reviewer-avatar {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.reviewer-name { font-size: 13px; font-weight: 700; color: var(--text-white); }
.reviewer-date { font-size: 11px; color: var(--text-muted); }

/* ====================================
   联系我们
   ==================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info-block h3 {
    font-size: 19px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 18px;
}

.contact-item {
    display: flex;
    gap: 12px;
    margin-bottom: 14px;
    align-items: flex-start;
}

.contact-icon {
    width: 34px; height: 34px;
    background: rgba(194,24,91,0.2);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    flex-shrink: 0;
}

.contact-label { font-size: 11px; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 14px; color: var(--text-white); font-weight: 600; }

/* ====================================
   底部
   ==================================== */
.site-footer {
    background: var(--bg-dark);
    border-top: 2px solid var(--border-color);
    padding: 56px 0 28px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 36px;
}

.footer-logo {
    height: 44px; width: auto;
    margin-bottom: 14px;
}

.company-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 14px;
}

.contact-info p {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.footer-col h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(106,27,154,0.4);
}

.footer-col ul li { margin-bottom: 7px; }

.footer-col ul li a {
    font-size: 13px;
    color: var(--text-muted);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}

/* 热门标签内链 */
.footer-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.footer-tag {
    background: rgba(106,27,154,0.3);
    color: var(--text-muted);
    border: 1px solid rgba(106,27,154,0.5);
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 12px;
    transition: var(--transition);
}

.footer-tag:hover {
    background: rgba(194,24,91,0.2);
    color: var(--primary-light);
    border-color: var(--primary);
}

/* 二维码 */
.qrcode-section { display: flex; gap: 14px; flex-wrap: wrap; }

.qrcode-box { text-align: center; }

.qrcode-box img {
    width: 90px; height: 90px;
    border-radius: var(--radius-sm);
    border: 2px solid var(--border-color);
    margin-bottom: 5px;
}

.qrcode-box p { font-size: 10px; color: var(--text-muted); }

/* 社交分享 */
.social-share {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    padding: 18px 0;
    border-top: 1px solid rgba(106,27,154,0.3);
    border-bottom: 1px solid rgba(106,27,154,0.3);
    margin-bottom: 22px;
}

.social-share span { font-size: 13px; color: var(--text-muted); }

.share-btn {
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid;
    background: transparent;
}

.share-btn.wechat  { color: #07c160; border-color: #07c160; }
.share-btn.weibo   { color: #e6162d; border-color: #e6162d; }
.share-btn.douyin  { color: #fe2c55; border-color: #fe2c55; }
.share-btn.bilibili{ color: #00a1d6; border-color: #00a1d6; }

.share-btn:hover { transform: translateY(-2px); opacity: 0.8; }

/* 版权 */
.copyright { text-align: center; }

.copyright p {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.copyright a { color: var(--primary-light); }

.update-time {
    font-size: 12px;
    color: rgba(206,147,216,0.7);
    font-weight: 600;
}

/* ====================================
   AI赋能区块背景
   ==================================== */
.ai-section-bg {
    background: url('/assets/images/video_thumb3.jpg') center/cover no-repeat;
    position: relative;
}

.ai-section-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(26,10,46,0.88);
}

.ai-section-bg .container { position: relative; z-index: 1; }

/* ====================================
   内页横幅
   ==================================== */
.page-banner {
    background: var(--gradient-main);
    padding: 56px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('/assets/images/banner2.jpg') center/cover no-repeat;
    opacity: 0.18;
}

.page-banner .container { position: relative; z-index: 1; }

.page-banner h2 {
    font-size: clamp(1.7rem, 4vw, 2.8rem);
    font-weight: 800;
    color: white;
    margin-bottom: 10px;
}

.page-banner p {
    font-size: 1rem;
    color: rgba(255,255,255,0.85);
    max-width: 600px;
    margin: 0 auto;
}

/* ====================================
   关于我们
   ==================================== */
.about-intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-img-wrap {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-card);
}

.about-text h3 {
    font-size: 1.7rem;
    font-weight: 800;
    color: var(--text-white);
    margin-bottom: 14px;
}

.about-text p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 14px;
}

/* ====================================
   直播展示区块
   ==================================== */
.live-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.live-card {
    background: var(--gradient-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(106,27,154,0.4);
    transition: var(--transition);
    cursor: pointer;
}

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

.live-img-wrap {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3/4;
    background: var(--bg-medium);
}

.live-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.live-card:hover .live-img-wrap img { transform: scale(1.06); }

.live-badge {
    position: absolute;
    top: 10px; left: 10px;
    background: #e53935;
    color: white;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 50px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.6; }
}

.live-viewers {
    position: absolute;
    top: 10px; right: 10px;
    background: rgba(0,0,0,0.65);
    color: white;
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 50px;
}

.live-info { padding: 12px 14px; }

.live-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 6px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ====================================
   加载动画
   ==================================== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}

.animate-in { animation: fadeInUp 0.55s ease forwards; }

/* 懒加载占位 */
img[loading="lazy"] {
    background: var(--bg-medium);
    min-height: 80px;
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary-dark); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ====================================
   响应式
   ==================================== */
@media (max-width: 1200px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 1024px) {
    .contact-grid { grid-template-columns: 1fr; }
    .about-intro  { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .header-inner { flex-wrap: wrap; }
    
    .main-nav {
        display: none;
        width: 100%;
        order: 3;
    }
    
    .main-nav.open { display: block; }
    
    .main-nav ul {
        flex-direction: column;
        gap: 2px;
        padding: 10px 0;
    }
    
    .main-nav ul li a {
        display: block;
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .nav-toggle { display: flex; }
    
    .hero-section { min-height: 400px; }
    
    .hero-stats { gap: 18px; }
    .stat-num   { font-size: 1.5rem; }
    
    .footer-grid { grid-template-columns: 1fr; }
    
    .video-grid  { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
    
    .section { padding: 44px 0; }
    
    .live-showcase { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}

@media (max-width: 480px) {
    .hero-btns { flex-direction: column; }
    
    .btn-primary, .btn-outline {
        text-align: center;
        width: 100%;
    }
    
    .video-grid  { grid-template-columns: 1fr; }
    .module-grid { grid-template-columns: 1fr 1fr; }
    
    .live-showcase { grid-template-columns: 1fr 1fr; }
    
    .expert-grid { grid-template-columns: 1fr 1fr; }
}