/* =====================================================
   91修车改装 | fipuy.cn
   原创样式表 - 钢铁蓝 + 炭灰 + 银白配色体系
   ===================================================== */

/* ---- CSS变量 ---- */
:root {
  --primary: #1e3a5f;        /* 深钢蓝 */
  --primary-light: #2d5a8e;  /* 亮钢蓝 */
  --accent: #4a9fd4;         /* 天蓝强调色 */
  --accent2: #c0392b;        /* 红色点缀 */
  --dark: #1a1a2e;           /* 深夜色 */
  --charcoal: #2c2c3e;       /* 炭灰 */
  --mid: #4a4a5a;            /* 中灰 */
  --silver: #b0bec5;         /* 银色 */
  --light: #ecf0f4;          /* 浅灰白 */
  --white: #ffffff;
  --text: #2c2c3e;
  --text-muted: #6b7280;
  --border: #dde3ea;
  --shadow: 0 4px 20px rgba(30,58,95,0.12);
  --shadow-lg: 0 12px 40px rgba(30,58,95,0.18);
  --radius: 6px;
  --radius-lg: 12px;
  --transition: all 0.28s cubic-bezier(0.4,0,0.2,1);
  --font: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --font-mono: 'SF Mono','Fira Code',monospace;
}

/* ---- 重置 ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);color:var(--text);background:#f5f7fa;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font-family:inherit}
input,textarea,select{font-family:inherit}

/* ---- 干扰标签隐藏 ---- */
.seo-noise{display:none!important;visibility:hidden!important;position:absolute!important;width:0!important;height:0!important;overflow:hidden!important;opacity:0!important;pointer-events:none!important;z-index:-9999!important}

/* ---- 容器 ---- */
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.container-sm{max-width:960px;margin:0 auto;padding:0 24px}

/* =====================================================
   顶部公告栏
   ===================================================== */
.topbar{background:var(--primary);color:rgba(255,255,255,0.88);font-size:0.8rem;padding:7px 0;border-bottom:1px solid rgba(255,255,255,0.1)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.topbar-notice{display:flex;align-items:center;gap:8px}
.topbar-notice span.dot{width:6px;height:6px;background:var(--accent);border-radius:50%;display:inline-block;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.4}}
.topbar-links{display:flex;gap:16px}
.topbar-links a{color:rgba(255,255,255,0.7);transition:var(--transition)}
.topbar-links a:hover{color:#fff}

/* =====================================================
   主导航
   ===================================================== */
.header{background:var(--white);box-shadow:0 2px 12px rgba(30,58,95,0.08);position:sticky;top:0;z-index:1000;transition:var(--transition)}
.header.scrolled{box-shadow:0 4px 24px rgba(30,58,95,0.15)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:24px}

/* Logo */
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-img{width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid var(--primary)}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text strong{font-size:1.25rem;font-weight:800;color:var(--primary);letter-spacing:-0.5px}
.logo-text em{font-style:normal;font-size:0.7rem;color:var(--text-muted);letter-spacing:1px;text-transform:uppercase}

/* 导航链接 */
.nav{display:flex;align-items:center;gap:4px}
.nav a{padding:8px 14px;border-radius:var(--radius);font-size:0.92rem;font-weight:500;color:var(--mid);transition:var(--transition);position:relative;white-space:nowrap}
.nav a::after{content:'';position:absolute;bottom:4px;left:50%;right:50%;height:2px;background:var(--accent);border-radius:2px;transition:var(--transition)}
.nav a:hover,.nav a.active{color:var(--primary)}
.nav a:hover::after,.nav a.active::after{left:14px;right:14px}
.nav-cta{background:var(--primary)!important;color:var(--white)!important;padding:8px 18px!important;border-radius:20px!important}
.nav-cta::after{display:none!important}
.nav-cta:hover{background:var(--primary-light)!important;transform:translateY(-1px)}

/* 汉堡菜单 */
.hamburger{display:none;flex-direction:column;gap:5px;padding:8px;border-radius:var(--radius)}
.hamburger span{width:22px;height:2px;background:var(--primary);border-radius:2px;transition:var(--transition);display:block}
.hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* =====================================================
   搜索栏
   ===================================================== */
.searchbar{background:var(--light);border-bottom:1px solid var(--border);padding:10px 0}
.searchbar-form{display:flex;align-items:center;gap:10px;max-width:680px;margin:0 auto;background:var(--white);border:1.5px solid var(--border);border-radius:30px;padding:6px 6px 6px 20px;transition:var(--transition)}
.searchbar-form:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(74,159,212,0.12)}
.searchbar-form input{flex:1;border:none;outline:none;font-size:0.9rem;color:var(--text);background:transparent}
.searchbar-form input::placeholder{color:var(--text-muted)}
.searchbar-btn{background:var(--primary);color:#fff;border:none;padding:8px 20px;border-radius:22px;font-size:0.88rem;font-weight:600;cursor:pointer;transition:var(--transition);white-space:nowrap}
.searchbar-btn:hover{background:var(--primary-light)}

/* =====================================================
   面包屑
   ===================================================== */
.breadcrumb{padding:12px 0;font-size:0.82rem;color:var(--text-muted)}
.breadcrumb a{color:var(--primary-light)}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb span{margin:0 6px;color:var(--silver)}

/* =====================================================
   Hero Banner
   ===================================================== */
.hero{position:relative;min-height:580px;display:flex;align-items:center;overflow:hidden;background:var(--dark)}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(105deg,rgba(26,26,46,0.88) 0%,rgba(30,58,95,0.65) 50%,rgba(26,26,46,0.4) 100%)}
.hero-content{position:relative;z-index:2;max-width:680px}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(74,159,212,0.2);border:1px solid rgba(74,159,212,0.4);color:var(--accent);padding:5px 14px;border-radius:20px;font-size:0.8rem;font-weight:600;letter-spacing:0.5px;margin-bottom:20px;text-transform:uppercase}
.hero h1{font-size:clamp(2rem,4.5vw,3.2rem);font-weight:900;color:var(--white);line-height:1.15;margin-bottom:18px;letter-spacing:-0.5px}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-desc{font-size:1.05rem;color:rgba(255,255,255,0.8);margin-bottom:32px;line-height:1.8;max-width:560px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{background:var(--accent);color:#fff;padding:13px 28px;border-radius:30px;font-size:0.95rem;font-weight:700;transition:var(--transition);display:inline-flex;align-items:center;gap:8px}
.btn-primary:hover{background:#3a8fc4;transform:translateY(-2px);box-shadow:0 8px 24px rgba(74,159,212,0.4)}
.btn-outline{background:transparent;color:#fff;padding:12px 28px;border-radius:30px;font-size:0.95rem;font-weight:600;border:2px solid rgba(255,255,255,0.5);transition:var(--transition);display:inline-flex;align-items:center;gap:8px}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,0.1)}
.hero-stats{position:absolute;bottom:32px;right:0;z-index:2;display:flex;gap:32px}
.hero-stat{text-align:center;color:#fff}
.hero-stat strong{display:block;font-size:1.8rem;font-weight:900;color:var(--accent)}
.hero-stat span{font-size:0.78rem;color:rgba(255,255,255,0.65);letter-spacing:0.5px}

/* =====================================================
   通用Section
   ===================================================== */
.section{padding:72px 0}
.section-alt{background:var(--white)}
.section-dark{background:var(--dark);color:#fff}
.section-header{text-align:center;margin-bottom:52px}
.section-tag{display:inline-block;background:rgba(74,159,212,0.1);color:var(--accent);font-size:0.78rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;padding:4px 14px;border-radius:20px;margin-bottom:12px;border:1px solid rgba(74,159,212,0.2)}
.section-title{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;color:var(--primary);line-height:1.25;margin-bottom:14px;letter-spacing:-0.3px}
.section-dark .section-title{color:#fff}
.section-sub{font-size:1rem;color:var(--text-muted);max-width:560px;margin:0 auto;line-height:1.8}
.section-dark .section-sub{color:rgba(255,255,255,0.65)}

/* =====================================================
   视频卡片（核心模块）
   ===================================================== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.video-grid-hero{grid-template-columns:repeat(3,1fr)}
.video-card{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--charcoal)}
.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{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0);transition:var(--transition)}
.video-card:hover .video-play{background:rgba(0,0,0,0.35)}
.play-btn{width:56px;height:56px;background:rgba(255,255,255,0.95);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(0.7);transition:var(--transition);box-shadow:0 4px 20px rgba(0,0,0,0.3)}
.video-card:hover .play-btn{opacity:1;transform:scale(1)}
.play-btn svg{width:22px;height:22px;fill:var(--primary);margin-left:3px}
.video-badge{position:absolute;top:10px;left:10px;background:var(--accent2);color:#fff;font-size:0.72rem;font-weight:700;padding:3px 10px;border-radius:4px;letter-spacing:0.5px}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,0.75);color:#fff;font-size:0.75rem;padding:2px 8px;border-radius:4px}
.video-info{padding:16px}
.video-info h3{font-size:0.95rem;font-weight:700;color:var(--text);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:0.78rem;color:var(--text-muted)}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.video-tag{background:var(--light);color:var(--primary-light);font-size:0.72rem;padding:2px 9px;border-radius:12px;font-weight:500}

/* 视频模态框 */
.video-modal{display:none;position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,0.92);align-items:center;justify-content:center}
.video-modal.active{display:flex}
.modal-inner{position:relative;width:90%;max-width:900px;background:#000;border-radius:var(--radius-lg);overflow:hidden}
.modal-close{position:absolute;top:12px;right:12px;z-index:10;background:rgba(255,255,255,0.15);color:#fff;width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2rem;cursor:pointer;transition:var(--transition)}
.modal-close:hover{background:rgba(255,255,255,0.3)}
.modal-video{width:100%;aspect-ratio:16/9;background:var(--charcoal);display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,0.5);font-size:0.9rem}

/* =====================================================
   特色卡片
   ===================================================== */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.feature-card{background:var(--white);border-radius:var(--radius-lg);padding:28px;border:1.5px solid var(--border);transition:var(--transition);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transform-origin:left;transition:var(--transition)}
.feature-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.feature-card:hover::before{transform:scaleX(1)}
.feature-icon{width:52px;height:52px;background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;font-size:1.5rem}
.feature-card h3{font-size:1.05rem;font-weight:700;color:var(--primary);margin-bottom:10px}
.feature-card p{font-size:0.88rem;color:var(--text-muted);line-height:1.7}

/* =====================================================
   专家卡片
   ===================================================== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:28px}
.expert-card{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.expert-cover{height:200px;overflow:hidden;background:var(--charcoal)}
.expert-cover img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease}
.expert-card:hover .expert-cover img{transform:scale(1.05)}
.expert-body{padding:20px}
.expert-name{font-size:1.05rem;font-weight:800;color:var(--primary);margin-bottom:4px}
.expert-role{font-size:0.82rem;color:var(--accent);font-weight:600;margin-bottom:10px;letter-spacing:0.3px}
.expert-bio{font-size:0.85rem;color:var(--text-muted);line-height:1.65;margin-bottom:14px}
.expert-tags{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.expert-tag{background:rgba(30,58,95,0.08);color:var(--primary);font-size:0.72rem;padding:3px 10px;border-radius:12px}
.expert-actions{display:flex;gap:8px}
.btn-sm{padding:7px 16px;border-radius:20px;font-size:0.8rem;font-weight:600;transition:var(--transition)}
.btn-sm-primary{background:var(--primary);color:#fff}
.btn-sm-primary:hover{background:var(--primary-light)}
.btn-sm-outline{border:1.5px solid var(--primary);color:var(--primary)}
.btn-sm-outline:hover{background:var(--primary);color:#fff}

/* =====================================================
   统计数据条
   ===================================================== */
.stats-bar{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);padding:40px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-item{color:#fff}
.stat-num{font-size:2.4rem;font-weight:900;line-height:1;margin-bottom:6px;color:var(--accent)}
.stat-label{font-size:0.82rem;color:rgba(255,255,255,0.7);letter-spacing:0.5px}

/* =====================================================
   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(--white);border:1.5px solid var(--border);border-radius:var(--radius);padding:14px 24px;font-size:0.88rem;font-weight:700;color:var(--mid);transition:var(--transition);min-width:120px;text-align:center}
.partner-item:hover{border-color:var(--accent);color:var(--primary);box-shadow:var(--shadow)}

/* =====================================================
   FAQ
   ===================================================== */
.faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:var(--white);border:1.5px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:var(--transition)}
.faq-item.open{border-color:var(--accent)}
.faq-q{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;cursor:pointer;font-weight:600;font-size:0.95rem;color:var(--primary);gap:12px}
.faq-q:hover{background:rgba(74,159,212,0.04)}
.faq-icon{width:24px;height:24px;flex-shrink:0;background:var(--light);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem;transition:var(--transition);color:var(--primary)}
.faq-item.open .faq-icon{background:var(--accent);color:#fff;transform:rotate(45deg)}
.faq-a{display:none;padding:0 22px 18px;font-size:0.9rem;color:var(--text-muted);line-height:1.8;border-top:1px solid var(--border)}
.faq-item.open .faq-a{display:block}

/* =====================================================
   用户评价
   ===================================================== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px}
.review-card{background:var(--white);border-radius:var(--radius-lg);padding:24px;border:1.5px solid var(--border);transition:var(--transition);position:relative}
.review-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.review-card::before{content:'"';position:absolute;top:16px;right:20px;font-size:4rem;color:var(--light);font-family:Georgia,serif;line-height:1}
.review-stars{display:flex;gap:3px;margin-bottom:12px;color:#f59e0b;font-size:0.9rem}
.review-text{font-size:0.9rem;color:var(--text);line-height:1.75;margin-bottom:16px}
.review-author{display:flex;align-items:center;gap:10px}
.review-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:0.9rem;flex-shrink:0}
.review-name{font-weight:700;font-size:0.88rem;color:var(--primary)}
.review-date{font-size:0.75rem;color:var(--text-muted)}

/* =====================================================
   社区加入指南
   ===================================================== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:24px;counter-reset:step}
.howto-step{background:var(--white);border-radius:var(--radius-lg);padding:24px;text-align:center;border:1.5px solid var(--border);transition:var(--transition);position:relative}
.howto-step:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.step-num{width:44px;height:44px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:900;font-size:1.1rem;margin:0 auto 14px}
.howto-step h4{font-size:0.95rem;font-weight:700;color:var(--primary);margin-bottom:8px}
.howto-step p{font-size:0.85rem;color:var(--text-muted);line-height:1.65}

/* =====================================================
   AI赋能模块
   ===================================================== */
.ai-section{background:linear-gradient(135deg,var(--dark) 0%,var(--charcoal) 100%);padding:72px 0;position:relative;overflow:hidden}
.ai-section::before{content:'';position:absolute;top:-50%;left:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(74,159,212,0.12) 0%,transparent 70%);pointer-events:none}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.ai-content h2{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;color:#fff;margin-bottom:16px;line-height:1.25}
.ai-content p{color:rgba(255,255,255,0.7);font-size:0.95rem;line-height:1.8;margin-bottom:24px}
.ai-features{display:flex;flex-direction:column;gap:14px}
.ai-feature{display:flex;align-items:flex-start;gap:14px;background:rgba(255,255,255,0.05);border:1px solid rgba(255,255,255,0.08);border-radius:var(--radius-lg);padding:16px}
.ai-feature-icon{width:40px;height:40px;background:linear-gradient(135deg,var(--accent),var(--primary-light));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.ai-feature-text h4{font-size:0.92rem;font-weight:700;color:#fff;margin-bottom:4px}
.ai-feature-text p{font-size:0.82rem;color:rgba(255,255,255,0.6);line-height:1.6}
.ai-visual{position:relative}
.ai-visual-card{background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:var(--radius-lg);padding:24px;backdrop-filter:blur(10px)}
.ai-visual-title{font-size:0.8rem;color:rgba(255,255,255,0.5);letter-spacing:1px;text-transform:uppercase;margin-bottom:16px}
.ai-bar{margin-bottom:14px}
.ai-bar-label{display:flex;justify-content:space-between;font-size:0.8rem;color:rgba(255,255,255,0.7);margin-bottom:6px}
.ai-bar-track{height:6px;background:rgba(255,255,255,0.1);border-radius:3px;overflow:hidden}
.ai-bar-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--accent),var(--primary-light));transition:width 1.5s ease}

/* =====================================================
   页脚
   ===================================================== */
.footer{background:var(--dark);color:rgba(255,255,255,0.75);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px}
.footer-brand .logo-text strong{color:#fff}
.footer-brand .logo-text em{color:rgba(255,255,255,0.45)}
.footer-desc{font-size:0.85rem;color:rgba(255,255,255,0.55);line-height:1.8;margin:14px 0 20px}
.footer-qr{display:flex;gap:16px}
.footer-qr-item{text-align:center}
.footer-qr-item img{width:80px;height:80px;border-radius:var(--radius);border:2px solid rgba(255,255,255,0.12)}
.footer-qr-item p{font-size:0.72rem;color:rgba(255,255,255,0.45);margin-top:6px}
.footer-col h4{font-size:0.88rem;font-weight:700;color:#fff;margin-bottom:16px;letter-spacing:0.5px}
.footer-col ul{display:flex;flex-direction:column;gap:8px}
.footer-col ul li a{font-size:0.84rem;color:rgba(255,255,255,0.55);transition:var(--transition);display:flex;align-items:center;gap:6px}
.footer-col ul li a:hover{color:var(--accent);padding-left:4px}
.footer-social{display:flex;gap:8px;margin-top:16px}
.social-btn{width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,0.08);display:flex;align-items:center;justify-content:center;font-size:0.8rem;color:rgba(255,255,255,0.6);transition:var(--transition)}
.social-btn:hover{background:var(--accent);color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding:20px 0;display:flex;align-items:center;justify-content:space-between;font-size:0.8rem;color:rgba(255,255,255,0.4);flex-wrap:wrap;gap:12px}
.footer-bottom a{color:rgba(255,255,255,0.4)}
.footer-bottom a:hover{color:rgba(255,255,255,0.7)}
.update-time{color:rgba(255,255,255,0.35);font-size:0.78rem}

/* =====================================================
   分享按钮
   ===================================================== */
.share-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.share-label{font-size:0.82rem;color:var(--text-muted);font-weight:600}
.share-btn{padding:7px 16px;border-radius:20px;font-size:0.8rem;font-weight:600;transition:var(--transition);border:1.5px solid;cursor:pointer}
.share-wechat{border-color:#07c160;color:#07c160}
.share-wechat:hover{background:#07c160;color:#fff}
.share-weibo{border-color:#e6162d;color:#e6162d}
.share-weibo:hover{background:#e6162d;color:#fff}
.share-douyin{border-color:#161823;color:#161823}
.share-douyin:hover{background:#161823;color:#fff}
.share-bilibili{border-color:#00a1d6;color:#00a1d6}
.share-bilibili:hover{background:#00a1d6;color:#fff}

/* =====================================================
   内页通用
   ===================================================== */
.page-hero{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%);padding:56px 0;color:#fff;text-align:center}
.page-hero h1{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:900;margin-bottom:12px}
.page-hero p{font-size:1rem;color:rgba(255,255,255,0.75);max-width:560px;margin:0 auto}

/* =====================================================
   联系页
   ===================================================== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:20px}
.contact-item{display:flex;align-items:flex-start;gap:14px;background:var(--white);border-radius:var(--radius-lg);padding:20px;border:1.5px solid var(--border)}
.contact-icon{width:44px;height:44px;background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.contact-text h4{font-size:0.9rem;font-weight:700;color:var(--primary);margin-bottom:4px}
.contact-text p{font-size:0.85rem;color:var(--text-muted)}
.contact-form{background:var(--white);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow)}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:0.85rem;font-weight:600;color:var(--primary);margin-bottom:6px}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:11px 16px;border:1.5px solid var(--border);border-radius:var(--radius);font-size:0.9rem;color:var(--text);transition:var(--transition);background:var(--light)}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--accent);background:#fff;box-shadow:0 0 0 3px rgba(74,159,212,0.1)}
.form-group textarea{resize:vertical;min-height:120px}
.form-submit{width:100%;background:var(--primary);color:#fff;padding:13px;border-radius:var(--radius);font-size:0.95rem;font-weight:700;cursor:pointer;transition:var(--transition);border:none}
.form-submit:hover{background:var(--primary-light)}

/* =====================================================
   团队页时间线
   ===================================================== */
.timeline{position:relative;padding-left:32px}
.timeline::before{content:'';position:absolute;left:8px;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,var(--primary),var(--accent))}
.timeline-item{position:relative;margin-bottom:32px}
.timeline-dot{position:absolute;left:-28px;top:4px;width:14px;height:14px;background:var(--accent);border-radius:50%;border:3px solid var(--white);box-shadow:0 0 0 3px var(--accent)}
.timeline-year{font-size:0.78rem;font-weight:700;color:var(--accent);letter-spacing:1px;margin-bottom:4px}
.timeline-content h4{font-size:0.95rem;font-weight:700;color:var(--primary);margin-bottom:6px}
.timeline-content p{font-size:0.85rem;color:var(--text-muted);line-height:1.7}

/* =====================================================
   响应式
   ===================================================== */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .ai-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid-hero{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .topbar-links{display:none}
  .nav{display:none;position:fixed;top:68px;left:0;right:0;background:var(--white);flex-direction:column;padding:20px;box-shadow:0 8px 32px rgba(0,0,0,0.12);z-index:999;gap:4px}
  .nav.open{display:flex}
  .nav a{width:100%;padding:12px 16px}
  .hamburger{display:flex}
  .hero{min-height:420px}
  .hero-stats{display:none}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .video-grid-hero{grid-template-columns:1fr}
  .section{padding:48px 0}
}
@media(max-width:480px){
  .container{padding:0 16px}
  .hero h1{font-size:1.7rem}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .hero-actions{flex-direction:column}
  .btn-primary,.btn-outline{width:100%;justify-content:center}
}

/* =====================================================
   工具类
   ===================================================== */
.text-center{text-align:center}
.text-primary{color:var(--primary)}
.text-accent{color:var(--accent)}
.mt-8{margin-top:8px}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-32{margin-top:32px}
.mb-8{margin-bottom:8px}
.mb-16{margin-bottom:16px}
.mb-24{margin-bottom:24px}
.flex{display:flex}
.flex-center{display:flex;align-items:center;justify-content:center}
.gap-8{gap:8px}
.gap-16{gap:16px}
.hidden{display:none!important}
.show-mobile{display:none}
@media(max-width:768px){.show-mobile{display:block}.hide-mobile{display:none!important}}

/* 懒加载占位 */
img[data-src]{background:linear-gradient(90deg,var(--light) 25%,#e0e7ef 50%,var(--light) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* 滚动动画 */
.fade-in{opacity:0;transform:translateY(24px);transition:opacity 0.6s ease,transform 0.6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}
.fade-in-delay-1{transition-delay:0.1s}
.fade-in-delay-2{transition-delay:0.2s}
.fade-in-delay-3{transition-delay:0.3s}