/* ============================================
   四虎 官网样式表 · 原创主题「琥珀糖影」
   配色：琥珀焦糖 #E8833A / 深可可 #241A14
   ============================================ */
:root{
  --amber:#E8833A;
  --amber-light:#FFD9A0;
  --cocoa:#241A14;
  --cocoa-2:#3A2B20;
  --card:#2E211A;
  --text:#F5EDE3;
  --text-dim:#C9B8A6;
  --radius:14px;
  --shadow:0 8px 28px rgba(0,0,0,.35);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--cocoa);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(36,26,20,.94);
  backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(232,131,58,.25);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;max-width:1200px;margin:0 auto;padding:0 20px;
}
.brand{display:flex;align-items:center;gap:10px}
.brand img.site-icon{width:34px;height:34px}
.brand img.site-logo{height:36px;width:auto}
.main-nav ul{display:flex;gap:6px}
.main-nav a{
  padding:8px 14px;border-radius:8px;font-size:15px;color:var(--text-dim);
  transition:all .25s;
}
.main-nav a:hover,.main-nav a.active{color:var(--amber-light);background:rgba(232,131,58,.15)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--amber-light);margin:5px 0;border-radius:2px}

/* ---------- 搜索框 ---------- */
.search-bar{background:var(--cocoa-2);border-bottom:1px solid rgba(232,131,58,.15);padding:10px 0}
.search-form{display:flex;gap:10px;max-width:640px;margin:0 auto;padding:0 20px}
.search-form input{
  flex:1;padding:10px 18px;border-radius:24px;border:1px solid rgba(232,131,58,.35);
  background:var(--cocoa);color:var(--text);font-size:14px;outline:none;
}
.search-form input:focus{border-color:var(--amber)}
.search-form button{
  padding:10px 26px;border-radius:24px;border:none;cursor:pointer;
  background:var(--amber);color:#fff;font-size:14px;font-weight:600;
}
.search-tip{text-align:center;font-size:12px;color:var(--text-dim);margin-top:6px;display:none}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding:14px 0;font-size:13px;color:var(--text-dim)}
.breadcrumb a{color:var(--amber)}
.breadcrumb span{margin:0 6px}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden}
.hero-bg{position:absolute;inset:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.55}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--cocoa) 8%,rgba(36,26,20,.55) 60%,rgba(36,26,20,.2))}
.hero-content{position:relative;z-index:2;padding:96px 20px 110px;max-width:1200px;margin:0 auto}
.hero h1{font-size:42px;line-height:1.3;color:var(--amber-light);max-width:640px}
.hero p.sub{font-size:18px;color:var(--text);max-width:560px;margin:18px 0 30px}
.btn{
  display:inline-block;padding:13px 34px;border-radius:28px;font-size:16px;font-weight:600;
  background:var(--amber);color:#fff;box-shadow:var(--shadow);transition:transform .25s;
}
.btn:hover{transform:translateY(-2px)}
.btn.ghost{background:transparent;border:1.5px solid var(--amber);color:var(--amber-light);margin-left:14px}
.hero-stats{display:flex;gap:38px;margin-top:44px;flex-wrap:wrap}
.hero-stats .stat b{font-size:26px;color:var(--amber-light)}
.hero-stats .stat span{display:block;font-size:13px;color:var(--text-dim)}

/* ---------- 通用板块 ---------- */
.section{padding:64px 0}
.section.alt{background:var(--cocoa-2)}
.section-head{text-align:center;margin-bottom:42px}
.section-head h2{font-size:30px;color:var(--amber-light)}
.section-head p{color:var(--text-dim);margin-top:10px;max-width:720px;margin-left:auto;margin-right:auto}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:16px}
.tag{
  font-size:12px;padding:4px 14px;border-radius:16px;
  background:rgba(232,131,58,.14);color:var(--amber-light);border:1px solid rgba(232,131,58,.3);
}

/* ---------- 视频卡片 ---------- */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.video-grid.cols3{grid-template-columns:repeat(3,1fr)}
.video-card{
  background:var(--card);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:transform .3s;
}
.video-card:hover{transform:translateY(-6px)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;cursor:pointer}
.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(36,26,20,.35);opacity:0;transition:opacity .3s;
}
.video-card:hover .play-btn,.video-thumb:focus .play-btn{opacity:1}
.play-btn i{
  width:60px;height:60px;border-radius:50%;background:var(--amber);
  display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px rgba(232,131,58,.5);
}
.play-btn i::after{
  content:"";display:block;margin-left:5px;
  border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;
}
.video-dur{
  position:absolute;right:10px;bottom:10px;font-size:12px;
  background:rgba(0,0,0,.72);color:#fff;padding:2px 8px;border-radius:5px;
}
.video-info{padding:16px 18px 18px}
.video-info h3{font-size:15.5px;line-height:1.5;color:var(--text);min-height:46px}
.video-meta{display:flex;gap:14px;margin-top:10px;font-size:12.5px;color:var(--text-dim)}

/* ---------- 服务/功能卡片 ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card{
  background:var(--card);border-radius:var(--radius);padding:28px 24px;
  border:1px solid rgba(232,131,58,.16);transition:border-color .3s;
}
.feature-card:hover{border-color:var(--amber)}
.feature-card .icon{
  width:48px;height:48px;border-radius:12px;margin-bottom:16px;
  background:linear-gradient(135deg,var(--amber),#c9660f);
  display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;
}
.feature-card h3{font-size:18px;color:var(--amber-light);margin-bottom:10px}
.feature-card p{font-size:14px;color:var(--text-dim)}

/* ---------- 专家 ---------- */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.expert-card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);text-align:center}
.expert-card img{aspect-ratio:1/1;object-fit:cover}
.expert-body{padding:20px 18px 24px}
.expert-body h3{font-size:18px;color:var(--amber-light)}
.expert-body .role{font-size:13px;color:var(--amber);margin:4px 0 10px}
.expert-body p{font-size:13px;color:var(--text-dim);min-height:80px}
.expert-links{margin-top:14px;display:flex;gap:10px;justify-content:center}
.expert-links a{
  font-size:12.5px;padding:7px 16px;border-radius:18px;
  background:rgba(232,131,58,.15);color:var(--amber-light);border:1px solid rgba(232,131,58,.3);
}
.expert-links a:hover{background:var(--amber);color:#fff}

/* ---------- Logo 墙 ---------- */
.logo-wall{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.logo-wall .partner{
  background:var(--card);border-radius:10px;padding:22px 10px;text-align:center;
  font-size:16px;font-weight:600;color:var(--text-dim);letter-spacing:1px;
  border:1px dashed rgba(232,131,58,.25);
}
.logo-wall .partner:hover{color:var(--amber-light);border-color:var(--amber)}

/* ---------- HowTo ---------- */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step-card{background:var(--card);border-radius:var(--radius);padding:26px 22px;position:relative}
.step-card .num{
  position:absolute;top:-16px;left:22px;width:34px;height:34px;border-radius:50%;
  background:var(--amber);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;
}
.step-card h3{font-size:16px;color:var(--amber-light);margin:12px 0 8px}
.step-card p{font-size:13.5px;color:var(--text-dim)}

/* ---------- FAQ ---------- */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:var(--card);border-radius:12px;margin-bottom:14px;overflow:hidden;border:1px solid rgba(232,131,58,.14)}
.faq-q{
  width:100%;display:flex;justify-content:space-between;align-items:center;
  padding:18px 22px;cursor:pointer;background:none;border:none;
  color:var(--text);font-size:15.5px;font-weight:600;text-align:left;
}
.faq-q::after{content:"+";font-size:22px;color:var(--amber);transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 18px;font-size:14px;color:var(--text-dim)}

/* ---------- 评价 ---------- */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{background:var(--card);border-radius:var(--radius);padding:24px 22px;border:1px solid rgba(232,131,58,.14)}
.review-card .stars{color:var(--amber);letter-spacing:3px;margin-bottom:10px;font-size:14px}
.review-card p{font-size:14px;color:var(--text)}
.review-user{display:flex;align-items:center;gap:10px;margin-top:16px}
.review-user .avatar{
  width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--amber),#a3510c);
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:15px;
}
.review-user b{font-size:14px}
.review-user span{display:block;font-size:12px;color:var(--text-dim)}

/* ---------- 联系我们 ---------- */
.contact-wrap{display:grid;grid-template-columns:1.2fr 1fr;gap:32px;align-items:start}
.contact-card{background:var(--card);border-radius:var(--radius);padding:30px;border:1px solid rgba(232,131,58,.16)}
.contact-card h3{color:var(--amber-light);font-size:19px;margin-bottom:16px}
.contact-card ul li{padding:8px 0;font-size:14.5px;color:var(--text-dim);border-bottom:1px dashed rgba(232,131,58,.12)}
.contact-card ul li b{color:var(--text);margin-right:8px}
.contact-card img.store-photo{border-radius:10px;margin-bottom:18px}
.entry-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:16px}
.entry-row a{
  padding:10px 20px;border-radius:22px;font-size:13.5px;
  background:rgba(232,131,58,.14);color:var(--amber-light);border:1px solid rgba(232,131,58,.3);
}
.entry-row a:hover{background:var(--amber);color:#fff}

/* ---------- 分享 ---------- */
.share-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.share-row a{
  padding:10px 24px;border-radius:22px;font-size:14px;font-weight:600;
  background:var(--card);border:1px solid rgba(232,131,58,.3);color:var(--amber-light);
  cursor:pointer;transition:all .25s;
}
.share-row a:hover{background:var(--amber);color:#fff}

/* ---------- 页脚 ---------- */
.contact-sub{font-size:14px;color:var(--text-dim);font-weight:500;margin:6px 0 10px}

/* ---------- 今日更新列表 ---------- */
.update-list{display:flex;flex-direction:column;gap:10px;max-width:900px;margin:0 auto}
.update-item{
  display:flex;align-items:center;gap:14px;
  background:var(--card);border:1px solid rgba(232,131,58,.18);
  border-radius:10px;padding:12px 18px;transition:border-color .25s;
}
.update-item:hover{border-color:var(--amber)}
.update-date{color:var(--amber);font-weight:700;font-size:14px;flex-shrink:0}
.update-item a{flex:1;font-size:14.5px;color:var(--text)}
.update-item a:hover{color:var(--amber-light)}
.update-tag{
  flex-shrink:0;font-size:12px;color:var(--amber-light);
  background:rgba(232,131,58,.15);padding:2px 10px;border-radius:12px;
}
@media (max-width:640px){.update-tag{display:none}}

.site-footer{background:#1B120C;border-top:1px solid rgba(232,131,58,.2);padding:52px 0 30px;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;max-width:1200px;margin:0 auto;padding:0 20px}
.footer-grid h4,.footer-grid h5,.footer-grid h6{color:var(--amber-light);font-size:16px;margin-bottom:14px;font-weight:600}
.footer-grid p,.footer-grid li{font-size:13.5px;color:var(--text-dim);padding:3px 0}
.footer-grid a:hover{color:var(--amber-light)}
.footer-logo{height:40px;width:auto;margin-bottom:14px}
.qr-row{display:flex;gap:18px}
.qr-box{text-align:center}
.qr-box img{width:96px;height:96px;border-radius:8px;border:2px solid rgba(232,131,58,.3)}
.qr-box span{display:block;font-size:12px;color:var(--text-dim);margin-top:6px}
.copyright{
  text-align:center;margin-top:36px;padding-top:22px;font-size:13px;color:var(--text-dim);
  border-top:1px solid rgba(232,131,58,.12);max-width:1200px;margin-left:auto;margin-right:auto;padding-left:20px;padding-right:20px;
}
.copyright .update-time{color:var(--amber-light)}

/* ---------- 内页头图 ---------- */
.page-hero{background:linear-gradient(135deg,var(--cocoa-2),var(--cocoa));padding:56px 0;text-align:center}
.page-hero h1{font-size:32px;color:var(--amber-light)}
.page-hero p{color:var(--text-dim);margin-top:12px;max-width:680px;margin-left:auto;margin-right:auto}

/* ---------- 文章排版 ---------- */
.article{max-width:860px;margin:0 auto}
.article h2{color:var(--amber-light);font-size:24px;margin:34px 0 14px}
.article h3{color:var(--amber);font-size:19px;margin:24px 0 10px}
.article p{margin:12px 0;color:var(--text-dim);font-size:15px}
.article strong{color:var(--text)}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .video-grid,.video-grid.cols3{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:1fr 1fr}
  .contact-wrap{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .logo-wall{grid-template-columns:repeat(3,1fr)}
  .hero h1{font-size:32px}
}
@media (max-width:640px){
  .main-nav{
    display:none;position:absolute;top:64px;left:0;right:0;
    background:rgba(36,26,20,.98);border-bottom:1px solid rgba(232,131,58,.25);
  }
  .main-nav.show{display:block}
  .main-nav ul{flex-direction:column;padding:12px 20px}
  .main-nav a{display:block;padding:12px 10px}
  .nav-toggle{display:block}
  .video-grid,.video-grid.cols3,.feature-grid,.expert-grid,.howto-steps,.review-grid{grid-template-columns:1fr}
  .logo-wall{grid-template-columns:repeat(2,1fr)}
  .hero-content{padding:64px 20px 72px}
  .hero h1{font-size:26px}
  .hero p.sub{font-size:15px}
  .btn.ghost{margin-left:0;margin-top:12px}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:44px 0}
}