/* 17c一起草 - 主样式文件 | breizh.cn */
:root {
  --primary: #1a56db;
  --primary-dark: #1340a8;
  --accent: #e53e3e;
  --accent-light: #fc8181;
  --dark: #0f172a;
  --dark2: #1e293b;
  --gray: #64748b;
  --light: #f1f5f9;
  --white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(26,86,219,0.10);
  --radius: 12px;
  --radius-sm: 6px;
  --font: 'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);color:var(--dark);background:var(--white);line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:var(--primary)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}

/* ===== 顶部公告栏 ===== */
.top-bar{background:linear-gradient(90deg,var(--primary),var(--accent));color:#fff;text-align:center;padding:6px 0;font-size:13px;letter-spacing:.5px}
.top-bar a{color:#fff;text-decoration:underline;margin-left:8px}

/* ===== 导航 ===== */
.site-header{background:var(--white);box-shadow:0 2px 12px rgba(0,0,0,.08);position:sticky;top:0;z-index:1000;transition:box-shadow .3s}
.header-inner{max-width:1280px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:70px}
.logo-wrap{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:700;color:var(--primary)}
.logo-wrap img{width:48px;height:48px;object-fit:contain;border-radius:50%}
.logo-text{background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{padding:8px 14px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;color:var(--dark2);transition:all .2s;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:var(--primary);color:#fff}
.nav-btn{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-btn span{display:block;width:24px;height:2px;background:var(--dark);border-radius:2px;transition:.3s}
.mobile-nav{display:none;background:var(--white);border-top:1px solid var(--border);padding:12px 0}
.mobile-nav a{display:block;padding:12px 24px;font-size:15px;color:var(--dark2);border-bottom:1px solid var(--border)}
.mobile-nav a:hover{background:var(--light);color:var(--primary)}

/* ===== 搜索框 ===== */
.search-bar{background:var(--light);border-bottom:1px solid var(--border);padding:12px 0}
.search-inner{max-width:700px;margin:0 auto;padding:0 24px;display:flex;gap:8px}
.search-input{flex:1;padding:10px 18px;border:2px solid var(--border);border-radius:24px;font-size:15px;outline:none;transition:border .2s;background:#fff;font-family:var(--font)}
.search-input:focus{border-color:var(--primary)}
.search-btn{padding:10px 24px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;border-radius:24px;font-size:15px;cursor:pointer;font-family:var(--font);font-weight:600;transition:opacity .2s}
.search-btn:hover{opacity:.88}

/* ===== Hero Banner ===== */
.hero{position:relative;overflow:hidden;min-height:520px;display:flex;align-items:center;background:var(--dark)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.55)}
.hero-content{position:relative;z-index:2;max-width:1280px;margin:0 auto;padding:60px 24px;color:#fff}
.hero-badge{display:inline-block;background:var(--accent);color:#fff;padding:4px 14px;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:16px;letter-spacing:.5px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.2;margin-bottom:16px;text-shadow:0 2px 12px rgba(0,0,0,.4)}
.hero p{font-size:1.1rem;opacity:.9;max-width:560px;margin-bottom:28px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:28px;font-size:15px;font-weight:600;cursor:pointer;border:none;transition:all .2s;font-family:var(--font)}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 16px rgba(26,86,219,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(26,86,219,.45)}
.btn-outline{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.7)}
.btn-outline:hover{background:rgba(255,255,255,.15)}
.btn-accent{background:linear-gradient(135deg,var(--accent),#c53030);color:#fff}
.btn-accent:hover{transform:translateY(-2px)}

/* ===== 通用区块 ===== */
.section{padding:64px 0}
.section-alt{background:var(--light)}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.section-header{text-align:center;margin-bottom:44px}
.section-tag{display:inline-block;background:rgba(26,86,219,.1);color:var(--primary);padding:4px 14px;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:12px}
.section-title{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:800;color:var(--dark);margin-bottom:12px}
.section-sub{color:var(--gray);font-size:1rem;max-width:560px;margin:0 auto}

/* ===== 视频卡片 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 36px rgba(26,86,219,.18)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--dark2)}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.35);opacity:0;transition:opacity .3s}
.play-btn svg{width:56px;height:56px;fill:none;stroke:#fff;stroke-width:2;filter:drop-shadow(0 2px 8px rgba(0,0,0,.4))}
.video-card:hover .play-btn{opacity:1}
.video-info{padding:14px 16px}
.video-title{font-size:15px;font-weight:600;color:var(--dark);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:12px;font-size:12px;color:var(--gray)}
.video-meta span{display:flex;align-items:center;gap:3px}
.video-tag{display:inline-block;background:rgba(26,86,219,.1);color:var(--primary);padding:2px 8px;border-radius:10px;font-size:11px;font-weight:600;margin-bottom:8px}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.7);color:#fff;padding:2px 7px;border-radius:4px;font-size:12px;font-weight:600}

/* ===== 专家卡片 ===== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:24px}
.expert-card{background:var(--white);border-radius:var(--radius);padding:28px 20px;text-align:center;box-shadow:var(--shadow);transition:transform .3s}
.expert-card:hover{transform:translateY(-5px)}
.expert-avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;margin:0 auto 14px;border:3px solid var(--primary)}
.expert-name{font-size:17px;font-weight:700;color:var(--dark);margin-bottom:4px}
.expert-role{font-size:13px;color:var(--primary);font-weight:600;margin-bottom:8px}
.expert-desc{font-size:13px;color:var(--gray);margin-bottom:14px;line-height:1.6}
.expert-btns{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.expert-btns a{padding:6px 14px;border-radius:16px;font-size:12px;font-weight:600;border:1.5px solid var(--primary);color:var(--primary);transition:all .2s}
.expert-btns a:hover{background:var(--primary);color:#fff}

/* ===== 统计数字 ===== */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:24px;text-align:center}
.stat-item{padding:24px 16px}
.stat-num{font-size:2.4rem;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.stat-label{font-size:14px;color:var(--gray);margin-top:6px}

/* ===== 功能模块 ===== */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px}
.feature-card{background:var(--white);border-radius:var(--radius);padding:24px 20px;text-align:center;box-shadow:var(--shadow);transition:all .3s;border:1.5px solid transparent}
.feature-card:hover{border-color:var(--primary);transform:translateY(-4px)}
.feature-icon{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,rgba(26,86,219,.1),rgba(229,62,62,.1));display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:24px}
.feature-title{font-size:15px;font-weight:700;color:var(--dark);margin-bottom:6px}
.feature-desc{font-size:13px;color:var(--gray);line-height:1.6}

/* ===== 评论 ===== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.review-card{background:var(--white);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);border-left:4px solid var(--primary)}
.review-stars{color:#f6c90e;font-size:16px;margin-bottom:10px}
.review-text{font-size:14px;color:var(--dark2);line-height:1.7;margin-bottom:14px}
.review-user{display:flex;align-items:center;gap:10px}
.review-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:700;flex-shrink:0}
.review-name{font-size:14px;font-weight:600;color:var(--dark)}
.review-date{font-size:12px;color:var(--gray)}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1.5px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden;transition:border-color .2s}
.faq-item.open{border-color:var(--primary)}
.faq-q{padding:18px 20px;font-size:15px;font-weight:600;color:var(--dark);cursor:pointer;display:flex;justify-content:space-between;align-items:center;background:var(--white);user-select:none}
.faq-q:hover{color:var(--primary)}
.faq-q .arrow{font-size:18px;transition:transform .3s;color:var(--primary)}
.faq-item.open .arrow{transform:rotate(180deg)}
.faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s}
.faq-item.open .faq-a{max-height:300px;padding:0 20px 18px}
.faq-a p{font-size:14px;color:var(--gray);line-height:1.8}

/* ===== 合作品牌 ===== */
.partner-grid{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center}
.partner-item{background:var(--white);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:14px 24px;font-size:14px;font-weight:600;color:var(--gray);transition:all .2s}
.partner-item:hover{border-color:var(--primary);color:var(--primary)}

/* ===== 社交分享 ===== */
.share-bar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border-radius:20px;font-size:13px;font-weight:600;cursor:pointer;border:none;transition:all .2s;font-family:var(--font)}
.share-wechat{background:#07c160;color:#fff}
.share-weibo{background:#e6162d;color:#fff}
.share-douyin{background:#010101;color:#fff}
.share-bilibili{background:#fb7299;color:#fff}
.share-btn:hover{opacity:.85;transform:translateY(-1px)}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px}
.contact-card{background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.contact-card h3{font-size:17px;font-weight:700;color:var(--dark);margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid var(--primary)}
.contact-item{display:flex;gap:10px;margin-bottom:12px;font-size:14px;color:var(--dark2)}
.contact-icon{color:var(--primary);font-size:16px;flex-shrink:0;margin-top:2px}
.qr-wrap{display:flex;gap:20px;flex-wrap:wrap}
.qr-item{text-align:center}
.qr-item img{width:100px;height:100px;border-radius:var(--radius-sm);border:1.5px solid var(--border)}
.qr-item p{font-size:12px;color:var(--gray);margin-top:6px}

/* ===== 页脚 ===== */
.site-footer{background:var(--dark);color:rgba(255,255,255,.75);padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .logo-wrap{color:#fff;margin-bottom:14px}
.footer-brand .logo-text{-webkit-text-fill-color:#fff;background:none}
.footer-desc{font-size:13px;line-height:1.8;opacity:.7;margin-bottom:16px}
.footer-col h4{font-size:15px;font-weight:700;color:#fff;margin-bottom:16px}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:13px;opacity:.7;transition:opacity .2s}
.footer-col ul li a:hover{opacity:1;color:var(--accent-light)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:gap;font-size:13px;opacity:.6}
.footer-bottom a{opacity:.8;margin-left:16px}
.footer-bottom a:hover{opacity:1}

/* ===== 面包屑 ===== */
.breadcrumb{background:var(--light);padding:12px 0;border-bottom:1px solid var(--border)}
.breadcrumb-inner{max-width:1280px;margin:0 auto;padding:0 24px;font-size:13px;color:var(--gray);display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.breadcrumb-inner a{color:var(--primary)}
.breadcrumb-inner span{opacity:.5}

/* ===== 内页标题区 ===== */
.page-hero{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;padding:48px 0;text-align:center}
.page-hero h1{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800;margin-bottom:10px}
.page-hero p{font-size:1rem;opacity:.85;max-width:560px;margin:0 auto}

/* ===== 内页内容 ===== */
.page-intro{background:var(--white);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);margin-bottom:32px;font-size:15px;line-height:1.9;color:var(--dark2)}
.page-intro h2{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:12px}

/* ===== 标签 ===== */
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.tag{display:inline-block;background:rgba(26,86,219,.08);color:var(--primary);padding:4px 12px;border-radius:16px;font-size:12px;font-weight:600;border:1px solid rgba(26,86,219,.15)}

/* ===== 加载更多 ===== */
.load-more{text-align:center;margin-top:36px}

/* ===== 响应式 ===== */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .main-nav{display:none}
  .nav-btn{display:flex}
  .hero{min-height:380px}
  .hero h1{font-size:1.8rem}
  .footer-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
  .contact-grid{grid-template-columns:1fr}
  .section{padding:44px 0}
  .footer-bottom{flex-direction:column;gap:8px;text-align:center}
}
@media(max-width:480px){
  .header-inner{padding:0 16px;height:60px}
  .logo-wrap{font-size:18px}
  .logo-wrap img{width:38px;height:38px}
  .hero-content{padding:40px 16px}
  .container{padding:0 16px}
  .search-inner{padding:0 16px}
  .video-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}
}

/* ===== 动画 ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
.fade-up{animation:fadeUp .6s ease both}
.delay-1{animation-delay:.1s}
.delay-2{animation-delay:.2s}
.delay-3{animation-delay:.3s}

/* ===== 滚动条 ===== */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--light)}
::-webkit-scrollbar-thumb{background:var(--primary);border-radius:3px}

/* ===== 视频播放覆盖层 ===== */
.video-overlay{position:fixed;inset:0;background:rgba(0,0,0,.88);z-index:9999;display:none;align-items:center;justify-content:center}
.video-overlay.active{display:flex}
.video-modal{background:var(--dark2);border-radius:var(--radius);padding:20px;max-width:800px;width:90%;position:relative}
.video-modal-close{position:absolute;top:12px;right:14px;background:none;border:none;color:#fff;font-size:24px;cursor:pointer;line-height:1}
.video-placeholder{aspect-ratio:16/9;background:linear-gradient(135deg,var(--dark),var(--dark2));display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);color:#fff;font-size:16px;gap:12px}