/* ============================================
   调教受虐 - 原创样式表
   品牌：调教受虐 | 域名：yld0755.cn
   配色：深紫黑+玫红+琥珀金
   ============================================ */

/* === 基础重置与变量 === */
:root {
    --primary: #1a0a2e;
    --secondary: #e94560;
    --accent: #f5a623;
    --bg-dark: #0f0f1a;
    --text-light: #e8e8f0;
    --card-bg: #1e1e35;
    --card-hover: #2a2a4a;
    --border-subtle: rgba(233,69,96,0.2);
    --gradient-main: linear-gradient(135deg, #e94560, #f5a623);
    --gradient-dark: linear-gradient(180deg, #0f0f1a 0%, #1a0a2e 100%);
    --shadow-card: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-hover: 0 12px 48px rgba(233,69,96,0.2);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.8;
    overflow-x: hidden;
}

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

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

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

ul, ol {
    list-style: none;
}

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

/* === 顶部导航栏 === */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15,15,26,0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(15,15,26,0.98);
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.site-logo img {
    height: 42px;
    width: auto;
}

.site-logo .logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.main-nav a {
    color: var(--text-light);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--accent);
    background: rgba(245,166,35,0.1);
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--gradient-main);
    border-radius: 2px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

/* === 搜索框 === */
.search-bar-wrap {
    background: var(--primary);
    padding: 15px 0;
    margin-top: 70px;
    border-bottom: 1px solid var(--border-subtle);
}

.search-bar {
    display: flex;
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.search-bar input {
    flex: 1;
    padding: 12px 20px;
    border: 2px solid var(--border-subtle);
    border-right: none;
    border-radius: var(--radius) 0 0 var(--radius);
    background: var(--card-bg);
    color: var(--text-light);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.search-bar input:focus {
    border-color: var(--secondary);
}

.search-bar input::placeholder {
    color: rgba(232,232,240,0.4);
}

.search-bar button {
    padding: 12px 28px;
    background: var(--gradient-main);
    border: none;
    border-radius: 0 var(--radius) var(--radius) 0;
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.search-bar button:hover {
    opacity: 0.9;
    transform: scale(1.02);
}

/* === Hero Banner === */
.hero-section {
    position: relative;
    height: 560px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.4);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(15,15,26,0.3) 0%, rgba(15,15,26,0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.hero-content h1 .brand-highlight {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.15rem;
    color: rgba(232,232,240,0.8);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--gradient-main);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(233,69,96,0.4);
    color: #fff;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: transparent;
    color: var(--text-light);
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-outline:hover {
    border-color: var(--secondary);
    color: var(--secondary);
    transform: translateY(-2px);
}

/* === 通用板块标题 === */
.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

.section-title h2 .highlight {
    color: var(--secondary);
}

.section-title h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-main);
    border-radius: 2px;
    margin: 12px auto 0;
}

.section-title p {
    color: rgba(232,232,240,0.6);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* === 视频卡片网格 === */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.video-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
}

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

.video-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}

.video-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.play-btn-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.3);
    opacity: 0;
    transition: var(--transition);
}

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

.play-btn-circle {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(233,69,96,0.5);
}

.play-btn-circle::after {
    content: '';
    display: block;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent #fff;
    margin-left: 4px;
}

.video-card:hover .play-btn-circle {
    transform: scale(1.1);
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.8);
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    z-index: 2;
}

.video-info {
    padding: 16px;
}

.video-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    color: rgba(232,232,240,0.5);
    font-size: 0.85rem;
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-tags {
    display: flex;
    gap: 6px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.video-tags span {
    padding: 3px 10px;
    background: rgba(233,69,96,0.1);
    color: var(--secondary);
    border-radius: 20px;
    font-size: 0.75rem;
}

/* === 内容板块 === */
.section-block {
    padding: 80px 0;
}

.section-block:nth-child(even) {
    background: var(--primary);
}

/* === 功能模块网格 === */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
}

.feature-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.feature-card p {
    color: rgba(232,232,240,0.6);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* === 专家展示 === */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.expert-card {
    display: flex;
    gap: 24px;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.expert-card:hover {
    border-color: var(--border-subtle);
    box-shadow: var(--shadow-card);
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--secondary);
    flex-shrink: 0;
}

.expert-info h4 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.expert-info .expert-title {
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.expert-info p {
    color: rgba(232,232,240,0.6);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.expert-actions {
    display: flex;
    gap: 10px;
}

.expert-actions a {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 500;
    transition: var(--transition);
}

.expert-actions .btn-sm-primary {
    background: var(--gradient-main);
    color: #fff;
}

.expert-actions .btn-sm-outline {
    border: 1px solid var(--border-subtle);
    color: var(--text-light);
}

.expert-actions .btn-sm-outline:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

/* === 合作品牌墙 === */
.brand-wall {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    align-items: center;
}

.brand-wall-item {
    background: var(--card-bg);
    padding: 20px 30px;
    border-radius: var(--radius-sm);
    color: rgba(232,232,240,0.5);
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid transparent;
}

.brand-wall-item:hover {
    color: var(--accent);
    border-color: var(--border-subtle);
}

/* === FAQ 手风琴 === */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    border: 1px solid transparent;
    transition: var(--transition);
}

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

.faq-question {
    padding: 18px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--secondary);
}

.faq-question .faq-toggle {
    font-size: 1.3rem;
    transition: transform 0.3s ease;
    color: var(--secondary);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

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

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

.faq-answer-inner {
    padding: 0 24px 18px;
    color: rgba(232,232,240,0.7);
    font-size: 0.92rem;
    line-height: 1.8;
}

/* === 用户评论 === */
.review-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    border: 1px solid transparent;
}

.review-card:hover {
    border-color: var(--border-subtle);
    box-shadow: var(--shadow-card);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 14px;
}

.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.review-user-info h5 {
    font-size: 0.95rem;
    font-weight: 600;
}

.review-user-info .review-date {
    color: rgba(232,232,240,0.4);
    font-size: 0.82rem;
}

.review-stars {
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.review-text {
    color: rgba(232,232,240,0.7);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* === 联系我们 === */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.contact-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px;
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 14px;
}

.contact-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.contact-card p {
    color: rgba(232,232,240,0.6);
    font-size: 0.9rem;
}

/* === 社交分享 === */
.share-btns {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: #fff;
    transition: var(--transition);
}

.share-btn:hover {
    transform: translateY(-2px);
    color: #fff;
}

.share-btn.wechat { background: #07c160; }
.share-btn.weibo { background: #e6162d; }
.share-btn.douyin { background: #161823; border: 1px solid #333; }
.share-btn.bilibili { background: #00a1d6; }

/* === 页脚 === */
.site-footer {
    background: var(--primary);
    border-top: 1px solid var(--border-subtle);
    padding: 50px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .footer-logo {
    height: 36px;
    margin-bottom: 14px;
}

.footer-brand p {
    color: rgba(232,232,240,0.5);
    font-size: 0.88rem;
    line-height: 1.7;
}

.footer-col h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-light);
}

.footer-col a {
    display: block;
    color: rgba(232,232,240,0.5);
    font-size: 0.88rem;
    padding: 4px 0;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--secondary);
    padding-left: 4px;
}

.footer-qr {
    display: flex;
    gap: 20px;
    margin-top: 16px;
}

.footer-qr-item {
    text-align: center;
}

.footer-qr-item img {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
}

.footer-qr-item span {
    display: block;
    font-size: 0.78rem;
    color: rgba(232,232,240,0.4);
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.footer-bottom p {
    color: rgba(232,232,240,0.4);
    font-size: 0.82rem;
}

/* === 面包屑导航 === */
.breadcrumb {
    padding: 16px 0;
    margin-top: 70px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    color: rgba(232,232,240,0.5);
}

.breadcrumb-list a {
    color: rgba(232,232,240,0.6);
}

.breadcrumb-list a:hover {
    color: var(--secondary);
}

.breadcrumb-list .separator {
    color: rgba(232,232,240,0.3);
}

.breadcrumb-list .current {
    color: var(--secondary);
}

/* === 内页样式 === */
.page-hero {
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
    margin-top: 70px;
}

.page-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(233,69,96,0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(245,166,35,0.08) 0%, transparent 50%);
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.page-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    position: relative;
    z-index: 2;
}

.page-hero p {
    color: rgba(232,232,240,0.7);
    font-size: 1.05rem;
    margin-top: 12px;
    position: relative;
    z-index: 2;
}

.page-content {
    padding: 60px 0;
}

/* === 内页文章列表 === */
.article-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.article-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.article-card .article-thumb {
    position: relative;
    padding-top: 56.25%;
    overflow: hidden;
}

.article-card .article-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.article-card:hover .article-thumb img {
    transform: scale(1.05);
}

.article-card .article-body {
    padding: 20px;
}

.article-card .article-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.5;
}

.article-card .article-body p {
    color: rgba(232,232,240,0.6);
    font-size: 0.9rem;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card .article-footer {
    padding: 12px 20px;
    border-top: 1px solid rgba(233,69,96,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    color: rgba(232,232,240,0.4);
}

/* === How-To 指南 === */
.howto-steps {
    max-width: 700px;
    margin: 0 auto;
}

.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 28px;
    align-items: flex-start;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.step-content p {
    color: rgba(232,232,240,0.6);
    font-size: 0.92rem;
    line-height: 1.7;
}

/* === 统计数据 === */
.stats-row {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
    padding: 40px 0;
}

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

.stat-item .stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-item .stat-label {
    color: rgba(232,232,240,0.5);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* === 懒加载占位 === */
.lazy-placeholder {
    background: var(--card-bg);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* === 返回顶部 === */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-main);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    border: none;
    box-shadow: 0 4px 15px rgba(233,69,96,0.4);
}

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

.back-to-top:hover {
    transform: translateY(-3px);
}

/* === 响应式设计 === */
@media (max-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .expert-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(15,15,26,0.98);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-subtle);
    }

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

    .mobile-menu-btn {
        display: block;
    }

    .hero-section {
        height: 420px;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .review-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .article-list {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .stats-row {
        gap: 30px;
    }

    .stat-item .stat-number {
        font-size: 2rem;
    }

    .section-block {
        padding: 50px 0;
    }

    .page-hero {
        height: 240px;
    }

    .page-hero h1 {
        font-size: 1.8rem;
    }

    .hero-btns {
        flex-direction: column;
        align-items: center;
    }

    .expert-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .search-bar {
        flex-direction: row;
    }
}

@media (max-width: 480px) {
    .header-inner {
        height: 60px;
    }

    .search-bar-wrap {
        margin-top: 60px;
    }

    .breadcrumb {
        margin-top: 60px;
    }

    .page-hero {
        margin-top: 60px;
    }

    .hero-content h1 {
        font-size: 1.6rem;
    }

    .section-title h2 {
        font-size: 1.5rem;
    }

    .footer-qr {
        flex-direction: column;
        align-items: center;
    }
}

/* === MCP服务前端占位 === */
.mcp-widget {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    border: 1px dashed var(--border-subtle);
    margin-top: 20px;
}

.mcp-widget p {
    color: rgba(232,232,240,0.4);
    font-size: 0.85rem;
}