/* =============================================
   足球直播 - cbhbe.cn - 主样式文件
   © 2026 足球直播
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #1a3a6b;
  --primary-dark: #0d1b2e;
  --accent: #ff6b00;
  --accent-light: #ff8c38;
  --text: #1a1a2e;
  --text-muted: #4a5568;
  --text-light: #718096;
  --bg: #f7f9fc;
  --bg-white: #ffffff;
  --bg-alt: #eef2f7;
  --border: #e2e8f0;
  --shadow: 0 4px 20px rgba(26,58,107,0.12);
  --shadow-lg: 0 8px 40px rgba(26,58,107,0.18);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.25s ease;
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;font-size:16px;}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;}
img{max-width:100%;height:auto;display:block;}
a{color:inherit;text-decoration:none;}
a:hover{color:var(--accent);}
ul,ol{list-style:none;}
button{cursor:pointer;border:none;background:none;font-family:inherit;}
input,textarea{font-family:inherit;}

/* ---- 容器 ---- */
.container{max-width:1200px;margin:0 auto;padding:0 20px;}
.text-center{text-align:center;}
.mt-24{margin-top:24px;}

/* ---- 顶部公告栏 ---- */
.top-bar{background:var(--primary-dark);color:rgba(255,255,255,0.85);font-size:13px;padding:8px 20px;display:flex;align-items:center;gap:16px;flex-wrap:wrap;}
.top-bar a{color:rgba(255,255,255,0.7);transition:color var(--transition);}
.top-bar a:hover{color:#fff;}
.top-bar span{flex:1;}

/* ---- 头部 ---- */
.site-header{background:#fff;position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border);box-shadow:0 2px 16px rgba(26,58,107,0.10);}
.header-inner{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:20px;height:68px;}

/* Logo */
.site-logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.site-logo img{width:44px;height:44px;border-radius:10px;object-fit:cover;}
.logo-text{font-size:22px;font-weight:900;color:var(--primary);letter-spacing:-0.5px;}
.logo-text span{color:var(--accent);}

/* 导航 */
.main-nav{flex:1;}
.nav-list{display:flex;align-items:center;gap:4px;flex-wrap:wrap;}
.nav-list a{padding:6px 12px;border-radius:6px;font-size:14px;font-weight:600;color:var(--text-muted);transition:all var(--transition);white-space:nowrap;}
.nav-list a:hover,.nav-list a.active{color:var(--primary);background:rgba(26,58,107,0.08);}

/* 头部操作区 */
.header-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.btn-live{background:var(--accent);color:#fff;padding:7px 16px;border-radius:50px;font-size:13px;font-weight:700;animation:pulse 2s infinite;}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(255,107,0,0.4);}50%{box-shadow:0 0 0 8px rgba(255,107,0,0);}}
.hamburger{display:none;flex-direction:column;gap:5px;padding:6px;border-radius:6px;}
.hamburger span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:all var(--transition);}
.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px);}
.hamburger.active span:nth-child(2){opacity:0;}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px);}

/* ---- 搜索栏 ---- */
.search-bar-wrap{background:var(--primary);padding:14px 0;}
.search-bar-inner{max-width:1200px;margin:0 auto;padding:0 20px;}
.search-form{display:flex;gap:8px;margin-bottom:8px;}
.search-form input{flex:1;padding:10px 18px;border-radius:50px;border:none;font-size:14px;outline:none;background:#fff;color:var(--text);}
.search-form button{background:var(--accent);color:#fff;padding:10px 24px;border-radius:50px;font-size:14px;font-weight:700;transition:background var(--transition);}
.search-form button:hover{background:var(--accent-light);}
.search-hot-tags{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.search-hot-tags span{color:rgba(255,255,255,0.6);font-size:13px;}
.search-hot-tags a{color:rgba(255,255,255,0.85);font-size:13px;padding:3px 10px;border-radius:50px;border:1px solid rgba(255,255,255,0.3);transition:all var(--transition);}
.search-hot-tags a:hover{background:rgba(255,255,255,0.15);color:#fff;}

/* ---- 面包屑 ---- */
.breadcrumb{background:#fff;border-bottom:1px solid var(--border);padding:10px 20px;font-size:13px;color:var(--text-light);max-width:100%;}
.breadcrumb a{color:var(--primary);}
.breadcrumb .sep{margin:0 6px;color:var(--border);}

/* ---- Hero区域 ---- */
.hero-section{position:relative;min-height:520px;display:flex;flex-direction:column;justify-content:center;overflow:hidden;}
.hero-bg{position:absolute;inset:0;background:url('/assets/images/hero-banner.jpg') center/cover no-repeat;transform:scale(1.05);}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,27,46,0.92) 0%,rgba(26,58,107,0.75) 60%,rgba(255,107,0,0.15) 100%);}
.hero-content{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:60px 20px 20px;}
.hero-badge{display:inline-block;background:rgba(255,107,0,0.2);border:1px solid rgba(255,107,0,0.5);color:#ff8c38;padding:6px 16px;border-radius:50px;font-size:13px;font-weight:700;margin-bottom:20px;}
.hero-content h1{font-size:clamp(28px,4vw,52px);font-weight:900;color:#fff;line-height:1.2;margin-bottom:16px;}
.hero-content h1 .highlight{color:var(--accent);}
.hero-desc{font-size:16px;color:rgba(255,255,255,0.8);max-width:600px;line-height:1.8;margin-bottom:28px;}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;}
.btn-primary{background:var(--accent);color:#fff;padding:13px 28px;border-radius:50px;font-size:15px;font-weight:700;transition:all var(--transition);display:inline-block;}
.btn-primary:hover{background:var(--accent-light);transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,107,0,0.35);color:#fff;}
.btn-secondary{background:rgba(255,255,255,0.12);color:#fff;padding:13px 28px;border-radius:50px;font-size:15px;font-weight:700;border:1px solid rgba(255,255,255,0.3);transition:all var(--transition);display:inline-block;}
.btn-secondary:hover{background:rgba(255,255,255,0.2);color:#fff;}
.hero-stats{position:relative;z-index:2;background:rgba(255,255,255,0.08);backdrop-filter:blur(10px);border-top:1px solid rgba(255,255,255,0.1);display:flex;justify-content:center;gap:0;padding:20px;}
.stat-item{text-align:center;padding:0 40px;border-right:1px solid rgba(255,255,255,0.15);}
.stat-item:last-child{border-right:none;}
.stat-item .num{display:block;font-size:32px;font-weight:900;color:var(--accent);}
.stat-item .label{font-size:13px;color:rgba(255,255,255,0.7);}

/* ---- 弹幕 ---- */
.danmaku-container{background:var(--primary-dark);height:48px;overflow:hidden;position:relative;}
.danmaku-item{position:absolute;top:12px;right:-400px;white-space:nowrap;color:rgba(255,255,255,0.85);font-size:14px;font-weight:600;animation:danmaku-scroll linear forwards;}
@keyframes danmaku-scroll{from{transform:translateX(0);}to{transform:translateX(calc(-100vw - 400px));}}

/* ---- 视频标签 ---- */
.video-tag-list{display:flex;gap:8px;flex-wrap:wrap;align-items:center;}
.video-tag{background:rgba(26,58,107,0.08);color:var(--primary);padding:4px 12px;border-radius:50px;font-size:13px;font-weight:600;transition:all var(--transition);cursor:pointer;}
.video-tag:hover,.video-tag a:hover{background:var(--primary);color:#fff;}
a.video-tag{display:inline-block;}
a.video-tag:hover{background:var(--primary);color:#fff;}

/* ---- Section通用 ---- */
.section{padding:56px 0;}
.section-alt{background:#fff;}
.section-dark{background:var(--primary-dark);}
.section-dark .section-title,.section-dark .section-desc{color:#fff;}
.section-dark .section-tag{background:rgba(255,107,0,0.15);border-color:rgba(255,107,0,0.3);color:#ff8c38;}
.section-header{text-align:center;margin-bottom:40px;}
.section-tag{display:inline-block;background:rgba(26,58,107,0.08);border:1px solid rgba(26,58,107,0.15);color:var(--primary);padding:6px 16px;border-radius:50px;font-size:13px;font-weight:700;margin-bottom:12px;}
.section-title{font-size:clamp(22px,3vw,34px);font-weight:900;color:var(--primary);margin-bottom:12px;}
.section-title .accent{color:var(--accent);}
.section-desc{font-size:15px;color:var(--text-muted);max-width:600px;margin:0 auto;line-height:1.7;}

/* ---- 直播卡片 ---- */
.live-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.live-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform var(--transition),box-shadow var(--transition);}
.live-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.live-card-header{background:var(--primary);padding:10px 16px;display:flex;align-items:center;justify-content:space-between;}
.live-tag{background:var(--accent);color:#fff;padding:3px 10px;border-radius:50px;font-size:12px;font-weight:700;animation:pulse 2s infinite;}
.live-time{color:rgba(255,255,255,0.8);font-size:13px;}
.live-card-body{padding:20px;}
.match-teams{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;}
.team{text-align:center;flex:1;}
.team-badge{font-size:32px;margin-bottom:4px;}
.team-name{font-size:14px;font-weight:700;color:var(--text);}
.vs-score{font-size:28px;font-weight:900;color:var(--accent);min-width:70px;text-align:center;}
.match-info{font-size:13px;color:var(--text-muted);margin-bottom:14px;text-align:center;}
.btn-watch{display:block;background:var(--primary);color:#fff;text-align:center;padding:10px;border-radius:var(--radius-sm);font-size:14px;font-weight:700;transition:background var(--transition);}
.btn-watch:hover{background:var(--accent);color:#fff;}

/* ---- 视频网格 ---- */
.video-grid{display:grid;gap:20px;}
.video-grid-4{grid-template-columns:repeat(4,1fr);}
.video-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform var(--transition),box-shadow var(--transition);cursor:pointer;}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#0d1b2e;}
.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 var(--transition);}
.video-card:hover .video-play-btn{background:rgba(0,0,0,0.45);}
.play-icon{width:52px;height:52px;background:rgba(255,107,0,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(0.7);transition:all var(--transition);}
.video-card:hover .play-icon{opacity:1;transform:scale(1);}
.play-icon::after{content:'';border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px;}
.video-badge{position:absolute;top:10px;left:10px;background:var(--primary);color:#fff;padding:3px 10px;border-radius:50px;font-size:12px;font-weight:700;}
.video-badge.live{background:var(--accent);animation:pulse 2s infinite;}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,0.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px;}
.video-info{padding:14px;}
.video-title{font-size:14px;font-weight:700;color:var(--text);line-height:1.5;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.video-meta{display:flex;gap:12px;font-size:12px;color:var(--text-light);margin-bottom:6px;}
.video-stats{display:flex;gap:12px;font-size:12px;color:var(--text-light);}

/* ---- AI功能区 ---- */
.ai-features-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;}
.ai-feature-image img{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%;aspect-ratio:4/3;object-fit:cover;}
.ai-features-list{display:flex;flex-direction:column;gap:24px;}
.ai-feature-item{display:flex;gap:16px;align-items:flex-start;}
.ai-icon{font-size:28px;flex-shrink:0;width:52px;height:52px;background:rgba(26,58,107,0.08);border-radius:12px;display:flex;align-items:center;justify-content:center;}
.ai-feature-text h4{font-size:16px;font-weight:800;color:var(--primary);margin-bottom:6px;}
.ai-feature-text p{font-size:14px;color:var(--text-muted);line-height:1.7;}

/* ---- 社区功能 ---- */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.community-card{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.1);border-radius:var(--radius);padding:28px;text-align:center;transition:all var(--transition);}
.community-card:hover{background:rgba(255,255,255,0.10);transform:translateY(-4px);}
.community-icon{font-size:40px;display:block;margin-bottom:14px;}
.community-card h3{font-size:18px;font-weight:800;color:#fff;margin-bottom:10px;}
.community-card p{font-size:14px;color:rgba(255,255,255,0.7);line-height:1.7;margin-bottom:16px;}
.btn-join{display:inline-block;background:var(--accent);color:#fff;padding:8px 20px;border-radius:50px;font-size:13px;font-weight:700;transition:background var(--transition);}
.btn-join:hover{background:var(--accent-light);color:#fff;}

/* ---- 专家卡片 ---- */
.experts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.expert-card{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);text-align:center;transition:transform var(--transition),box-shadow var(--transition);}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.expert-avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;margin:0 auto 12px;border:3px solid var(--accent);}
.expert-name{font-size:18px;font-weight:800;color:var(--primary);margin-bottom:4px;}
.expert-title{font-size:13px;color:var(--text-light);margin-bottom:10px;}
.expert-desc{font-size:13px;color:var(--text-muted);line-height:1.6;margin-bottom:12px;}
.expert-tags{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:14px;}
.expert-tag{background:rgba(26,58,107,0.08);color:var(--primary);padding:3px 10px;border-radius:50px;font-size:12px;font-weight:600;}
.expert-actions{display:flex;gap:8px;justify-content:center;}
.btn-sm{padding:6px 14px;border-radius:50px;font-size:13px;font-weight:700;transition:all var(--transition);display:inline-block;}
.btn-sm-primary{background:var(--primary);color:#fff;}
.btn-sm-primary:hover{background:var(--accent);color:#fff;}
.btn-sm-outline{border:1px solid var(--primary);color:var(--primary);}
.btn-sm-outline:hover{background:var(--primary);color:#fff;}

/* ---- 图片画廊 ---- */
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
.gallery-item{position:relative;aspect-ratio:4/3;overflow:hidden;border-radius:var(--radius-sm);cursor:pointer;}
.gallery-item img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease;}
.gallery-item:hover img{transform:scale(1.08);}
.gallery-overlay{position:absolute;inset:0;background:rgba(26,58,107,0);display:flex;align-items:center;justify-content:center;transition:background var(--transition);}
.gallery-item:hover .gallery-overlay{background:rgba(26,58,107,0.5);}
.gallery-zoom{font-size:28px;opacity:0;transform:scale(0.5);transition:all var(--transition);}
.gallery-item:hover .gallery-zoom{opacity:1;transform:scale(1);}

/* ---- 合作伙伴 ---- */
.partners-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;}
.partner-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;text-align:center;font-size:13px;font-weight:700;color:var(--text-muted);transition:all var(--transition);}
.partner-item:hover{border-color:var(--primary);color:var(--primary);box-shadow:var(--shadow);}

/* ---- 步骤卡片 ---- */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.step-card{background:#fff;border-radius:var(--radius);padding:28px 20px;text-align:center;box-shadow:var(--shadow);position:relative;}
.step-num{width:48px;height:48px;background:var(--primary);color:#fff;border-radius:50%;font-size:22px;font-weight:900;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;}
.step-card h4{font-size:17px;font-weight:800;color:var(--primary);margin-bottom:10px;}
.step-card p{font-size:14px;color:var(--text-muted);line-height:1.7;}

/* ---- 联系区域 ---- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start;}
.contact-info h3{font-size:20px;font-weight:800;color:var(--primary);margin-bottom:20px;}
.contact-item{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--border);}
.contact-icon{font-size:24px;flex-shrink:0;}
.contact-label{font-size:12px;color:var(--text-light);margin-bottom:2px;}
.contact-value{font-size:15px;font-weight:700;color:var(--text);}
.qr-codes{display:flex;gap:24px;align-items:flex-start;}
.qr-item{text-align:center;}
.qr-label{font-size:13px;color:var(--text-muted);margin-top:6px;font-weight:600;}

/* ---- 用户评价 ---- */
.reviews-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.review-card{background:#fff;border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:transform var(--transition);}
.review-card:hover{transform:translateY(-3px);}
.review-stars{color:#f6ad55;font-size:16px;margin-bottom:10px;}
.review-text{font-size:14px;color:var(--text-muted);line-height:1.7;margin-bottom:14px;}
.review-author{display:flex;align-items:center;gap:10px;}
.review-avatar{width:36px;height:36px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0;}
.review-name{font-size:14px;font-weight:700;color:var(--text);}
.review-date{font-size:12px;color:var(--text-light);}

/* ---- FAQ ---- */
.faq-list{max-width:800px;margin:0 auto;}
.faq-item{background:#fff;border-radius:var(--radius-sm);margin-bottom:8px;box-shadow:0 2px 8px rgba(26,58,107,0.06);overflow:hidden;}
.faq-question{padding:18px 20px;font-size:15px;font-weight:700;color:var(--primary);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background var(--transition);}
.faq-question:hover{background:rgba(26,58,107,0.04);}
.faq-toggle{font-size:20px;font-weight:400;color:var(--accent);transition:transform var(--transition);}
.faq-item.active .faq-toggle{transform:rotate(45deg);}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease;}
.faq-item.active .faq-answer{max-height:300px;}
.faq-answer > div{padding:0 20px 18px;font-size:14px;color:var(--text-muted);line-height:1.8;}

/* ---- 分享区域 ---- */
.share-section{background:var(--bg-alt);padding:20px 0;border-top:1px solid var(--border);}
.share-title{font-size:15px;font-weight:700;color:var(--primary);margin-bottom:12px;text-align:center;}
.share-buttons{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;}
.share-btn{padding:9px 20px;border-radius:50px;font-size:13px;font-weight:700;transition:all var(--transition);cursor:pointer;border:none;}
.share-wechat{background:#07c160;color:#fff;}
.share-weibo{background:#e6162d;color:#fff;}
.share-douyin{background:#000;color:#fff;}
.share-bilibili{background:#00a1d6;color:#fff;}
.share-btn:hover{opacity:0.85;transform:translateY(-1px);}

/* ---- 页脚 ---- */
.site-footer{background:var(--primary-dark);color:rgba(255,255,255,0.8);padding:48px 0 0;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px;margin-bottom:40px;}
.footer-brand .site-logo .logo-text{color:#fff;}
.footer-brand .site-logo .logo-text span{color:var(--accent);}
.footer-desc{font-size:14px;color:rgba(255,255,255,0.6);line-height:1.7;margin:12px 0 16px;}
.footer-social{display:flex;gap:10px;}
.social-link{width:36px;height:36px;background:rgba(255,255,255,0.1);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;transition:background var(--transition);}
.social-link:hover{background:var(--accent);}
.footer-col h4{font-size:15px;font-weight:800;color:#fff;margin-bottom:14px;}
.footer-links li{margin-bottom:8px;}
.footer-links a{font-size:14px;color:rgba(255,255,255,0.6);transition:color var(--transition);}
.footer-links a:hover{color:#fff;}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding:20px 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;}
.footer-copyright{font-size:13px;color:rgba(255,255,255,0.5);}
.footer-copyright a{color:rgba(255,255,255,0.7);}
.footer-copyright a:hover{color:#fff;}
.footer-links-bottom{display:flex;gap:16px;}
.footer-links-bottom a{font-size:13px;color:rgba(255,255,255,0.5);transition:color var(--transition);}
.footer-links-bottom a:hover{color:#fff;}

/* ---- 内页通用 ---- */
.page-hero{background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 100%);padding:48px 0;text-align:center;}
.page-hero h1{font-size:clamp(24px,3vw,38px);font-weight:900;color:#fff;margin-bottom:12px;}
.page-hero p{font-size:15px;color:rgba(255,255,255,0.8);max-width:600px;margin:0 auto;line-height:1.7;}
.page-content{padding:40px 0;}
.content-layout{max-width:1200px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:1fr 300px;gap:32px;}
.content-main{}
.content-sidebar{}
.sidebar-widget{background:#fff;border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:20px;}
.sidebar-widget h3{font-size:16px;font-weight:800;color:var(--primary);margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--accent);}
.sidebar-list li{margin-bottom:8px;}
.sidebar-list a{font-size:14px;color:var(--text-muted);transition:color var(--transition);display:flex;align-items:center;gap:6px;}
.sidebar-list a::before{content:'›';color:var(--accent);font-weight:700;}
.sidebar-list a:hover{color:var(--primary);}

/* ---- 响应式 ---- */
@media (max-width:1100px){
  .video-grid-4{grid-template-columns:repeat(3,1fr);}
  .reviews-grid{grid-template-columns:repeat(3,1fr);}
  .experts-grid{grid-template-columns:repeat(2,1fr);}
  .partners-grid{grid-template-columns:repeat(4,1fr);}
}

@media (max-width:900px){
  .live-grid{grid-template-columns:repeat(2,1fr);}
  .ai-features-grid{grid-template-columns:1fr;}
  .ai-feature-image{display:none;}
  .community-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .howto-steps{grid-template-columns:repeat(2,1fr);}
  .contact-grid{grid-template-columns:1fr;}
  .content-layout{grid-template-columns:1fr;}
  .content-sidebar{display:none;}
  .video-grid-4{grid-template-columns:repeat(2,1fr);}
  .reviews-grid{grid-template-columns:repeat(2,1fr);}
  .gallery-grid{grid-template-columns:repeat(3,1fr);}
}

@media (max-width:680px){
  .hamburger{display:flex;}
  .main-nav{position:fixed;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg);max-height:0;overflow:hidden;transition:max-height 0.35s ease;}
  .main-nav.open{max-height:500px;}
  .nav-list{flex-direction:column;padding:10px 20px;gap:0;}
  .nav-list a{padding:12px 0;border-bottom:1px solid var(--border);border-radius:0;width:100%;}
  .hero-stats{flex-direction:column;gap:12px;}
  .stat-item{border-right:none;border-bottom:1px solid rgba(255,255,255,0.1);padding:12px 0;}
  .stat-item:last-child{border-bottom:none;}
  .live-grid{grid-template-columns:1fr;}
  .community-grid{grid-template-columns:1fr;}
  .experts-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .howto-steps{grid-template-columns:1fr;}
  .video-grid-4{grid-template-columns:repeat(2,1fr);}
  .reviews-grid{grid-template-columns:1fr;}
  .gallery-grid{grid-template-columns:repeat(2,1fr);}
  .partners-grid{grid-template-columns:repeat(3,1fr);}
  .footer-bottom{flex-direction:column;text-align:center;}
  .hero-content h1{font-size:26px;}
}

@media (max-width:400px){
  .video-grid-4{grid-template-columns:1fr;}
  .gallery-grid{grid-template-columns:repeat(2,1fr);}
  .partners-grid{grid-template-columns:repeat(2,1fr);}
}