/* ================================================================
   17c一起草汽车改装社区 - 主样式表
   品牌色：赛车橙 #FF6B00 / 深夜黑 #0D0D0F / 碳纤维灰 #1C1C1E
   y153sh.cn
================================================================ */

:root {
  --primary:       #FF6B00;
  --primary-dark:  #CC5500;
  --primary-light: #FF9A4D;
  --accent:        #FFD700;
  --bg-dark:       #0D0D0F;
  --bg-card:       #141416;
  --bg-section:    #111113;
  --border:        rgba(255,107,0,0.15);
  --text-light:    #F0F0F0;
  --text-muted:    #8A8A9A;
  --text-dim:      #555568;
  --radius:        10px;
  --radius-lg:     18px;
  --shadow:        0 4px 24px rgba(255,107,0,0.12);
  --shadow-lg:     0 8px 48px rgba(255,107,0,0.2);
  --transition:    0.28s cubic-bezier(0.4,0,0.2,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{background:var(--bg-dark);color:var(--text-light);font-family:'Microsoft YaHei','PingFang SC','Helvetica Neue',Arial,sans-serif;line-height:1.7;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--primary-light)}
ul,ol{list-style:none}
button{cursor:pointer;border:none;background:none;font-family:inherit}

/* ---- 滚动条 ---- */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:#111}
::-webkit-scrollbar-thumb{background:var(--primary);border-radius:3px}

/* ---- 容器 ---- */
.container{max-width:1280px;margin:0 auto;padding:0 20px}
section{padding:72px 0}

/* ================================================================
   HEADER
================================================================ */
#site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(13,13,15,0.95);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
}
.header-inner{
  display:flex;align-items:center;gap:20px;height:68px;
}
.site-logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.site-logo img:first-child{width:36px;height:36px;border-radius:8px}
.site-logo img:last-child{height:44px;width:auto}

/* 主导航 */
.main-nav{display:flex;align-items:center;gap:4px;flex:1}
.main-nav a{
  padding:8px 14px;border-radius:6px;font-size:0.9rem;font-weight:500;
  color:var(--text-muted);transition:all var(--transition);white-space:nowrap;
}
.main-nav a:hover,.main-nav a.active{color:var(--primary);background:rgba(255,107,0,0.1)}

/* 搜索框 */
.search-bar{
  display:flex;align-items:center;
  background:rgba(255,255,255,0.05);
  border:1px solid var(--border);
  border-radius:24px;padding:0 16px;gap:8px;
  transition:border-color var(--transition);
}
.search-bar:focus-within{border-color:var(--primary)}
.search-bar input{
  background:none;border:none;outline:none;
  color:var(--text-light);font-size:0.88rem;width:180px;padding:8px 0;
}
.search-bar input::placeholder{color:var(--text-dim)}
.search-bar button{color:var(--text-muted);padding:4px;transition:color var(--transition)}
.search-bar button:hover{color:var(--primary)}

/* 汉堡菜单 */
.menu-toggle{
  display:none;flex-direction:column;gap:5px;padding:8px;
  width:40px;height:40px;justify-content:center;align-items:center;
}
.menu-toggle span{
  display:block;width:22px;height:2px;background:var(--text-light);
  border-radius:2px;transition:all var(--transition);
}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* 搜索提示 */
#search-tip{
  position:absolute;top:68px;left:50%;transform:translateX(-50%);
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:12px 20px;
  font-size:0.85rem;color:var(--text-muted);
  box-shadow:var(--shadow);display:none;white-space:nowrap;z-index:999;
}

/* ================================================================
   面包屑
================================================================ */
.breadcrumb{
  display:flex;align-items:center;gap:6px;
  padding:12px 0;font-size:0.82rem;color:var(--text-dim);
  border-bottom:1px solid rgba(255,255,255,0.04);
  margin-bottom:0;
}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:var(--text-dim)}
.breadcrumb .current{color:var(--primary)}

/* ================================================================
   HERO
================================================================ */
.hero{
  position:relative;min-height:88vh;display:flex;align-items:center;
  overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;
  background:linear-gradient(135deg,#0D0D0F 0%,#1a0a00 50%,#0D0D0F 100%);
}
.hero-bg img{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0.45;mix-blend-mode:luminosity;
}
.hero-bg::after{
  content:'';position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(13,13,15,0.92) 0%,rgba(13,13,15,0.5) 60%,rgba(13,13,15,0.2) 100%);
}
.hero-content{position:relative;z-index:2;max-width:680px}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,107,0,0.12);border:1px solid rgba(255,107,0,0.3);
  border-radius:20px;padding:6px 16px;font-size:0.82rem;
  color:var(--primary-light);margin-bottom:24px;
}
.hero-eyebrow::before{content:'';width:6px;height:6px;background:var(--primary);border-radius:50%;animation:blink 1.5s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0.3}}
.hero h1{
  font-size:clamp(2.2rem,5vw,3.8rem);font-weight:900;
  line-height:1.15;margin-bottom:20px;
  text-shadow:0 2px 20px rgba(255,107,0,0.3);
}
.hero h1 .brand{color:var(--primary)}
.hero-sub{
  font-size:1.1rem;color:var(--text-muted);margin-bottom:32px;
  line-height:1.8;max-width:520px;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{
  display:flex;gap:32px;margin-top:48px;
  padding-top:32px;border-top:1px solid var(--border);
}
.hero-stat .num{font-size:1.8rem;font-weight:800;color:var(--primary)}
.hero-stat .label{font-size:0.8rem;color:var(--text-muted)}

/* ================================================================
   按钮
================================================================ */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:8px;font-size:0.95rem;font-weight:600;
  transition:all var(--transition);cursor:pointer;
}
.btn-primary{
  background:var(--primary);color:white;
  box-shadow:0 4px 20px rgba(255,107,0,0.35);
}
.btn-primary:hover{background:var(--primary-dark);color:white;transform:translateY(-2px);box-shadow:0 8px 28px rgba(255,107,0,0.45)}
.btn-outline{
  border:1.5px solid var(--primary);color:var(--primary);background:transparent;
}
.btn-outline:hover{background:rgba(255,107,0,0.1);transform:translateY(-2px)}
.btn-ghost{color:var(--text-muted);border:1px solid var(--border);background:transparent}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{padding:8px 18px;font-size:0.85rem}

/* ================================================================
   通用区块标题
================================================================ */
.section-header{text-align:center;margin-bottom:52px}
.section-title{
  font-size:clamp(1.6rem,3vw,2.4rem);font-weight:800;
  margin-bottom:12px;
}
.section-title span{color:var(--primary)}
.section-subtitle{font-size:1rem;color:var(--text-muted);max-width:600px;margin:0 auto}

/* ================================================================
   视频卡片
================================================================ */
.video-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:24px;
}
.video-card{
  background:var(--bg-card);border-radius:var(--radius-lg);
  overflow:hidden;border:1px solid var(--border);
  transition:all var(--transition);
}
.video-card:hover{transform:translateY(-6px);border-color:rgba(255,107,0,0.4);box-shadow:var(--shadow-lg)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 0.5s 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(0,0,0,0.35);opacity:0;transition:opacity var(--transition);
}
.video-card:hover .video-play-btn{opacity:1}
.play-icon{
  width:60px;height:60px;background:rgba(255,107,0,0.9);
  border-radius:50%;display:flex;align-items:center;justify-content:center;
  transform:scale(0.85);transition:transform var(--transition);
  box-shadow:0 4px 20px rgba(255,107,0,0.5);
}
.video-card:hover .play-icon{transform:scale(1)}
.play-icon svg{width:22px;height:22px;margin-left:4px}
.video-duration{
  position:absolute;bottom:10px;right:10px;
  background:rgba(0,0,0,0.8);color:white;
  font-size:0.75rem;padding:3px 8px;border-radius:4px;font-weight:600;
}
.video-info{padding:16px}
.video-title{
  font-size:0.95rem;font-weight:600;color:var(--text-light);
  margin-bottom:10px;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.video-meta{display:flex;align-items:center;justify-content:space-between;gap:8px}
.video-author{display:flex;align-items:center;gap:8px;font-size:0.82rem;color:var(--text-muted)}
.author-avatar{
  width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  display:flex;align-items:center;justify-content:center;
  font-size:0.75rem;font-weight:700;color:white;flex-shrink:0;
}
.video-stats{display:flex;gap:10px;font-size:0.78rem;color:var(--text-dim)}
.video-stats span{display:flex;align-items:center;gap:3px}
.video-date{font-size:0.75rem;color:var(--text-dim);margin-top:6px}

/* ================================================================
   功能特性卡片
================================================================ */
.features-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
}
.feature-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:28px;
  transition:all 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(--primary-light));
  transform:scaleX(0);transform-origin:left;transition:transform var(--transition);
}
.feature-card:hover{border-color:rgba(255,107,0,0.35);transform:translateY(-4px);box-shadow:var(--shadow)}
.feature-card:hover::before{transform:scaleX(1)}
.feature-icon{font-size:2.2rem;margin-bottom:16px}
.feature-title{font-size:1.05rem;font-weight:700;color:var(--text-light);margin-bottom:8px}
.feature-desc{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(260px,1fr));
  gap:28px;
}
.expert-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:28px;text-align:center;
  transition:all var(--transition);
}
.expert-card:hover{border-color:rgba(255,107,0,0.4);transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.expert-avatar{
  width:100px;height:100px;border-radius:50%;
  object-fit:cover;margin:0 auto 16px;
  border:3px solid var(--primary);
}
.expert-name{font-size:1.1rem;font-weight:700;color:var(--text-light);margin-bottom:4px}
.expert-role{font-size:0.85rem;color:var(--primary);margin-bottom:12px}
.expert-bio{font-size:0.83rem;color:var(--text-muted);line-height:1.7;margin-bottom:14px;text-align:left}
.expert-cert{
  background:rgba(255,107,0,0.06);border:1px solid rgba(255,107,0,0.15);
  border-radius:8px;padding:10px;margin-bottom:12px;text-align:left;
}
.expert-cert h5{font-size:0.75rem;color:var(--primary-light);margin-bottom:4px}
.expert-cert p{font-size:0.78rem;color:var(--text-muted)}
.expert-works{margin-bottom:12px;text-align:left}
.expert-works h5{font-size:0.8rem;color:var(--text-light);margin-bottom:6px}
.expert-works li{font-size:0.78rem;color:var(--text-muted);padding:3px 0;border-bottom:1px solid rgba(255,255,255,0.04)}
.expert-social a{font-size:0.78rem;color:var(--primary-light)}
.expert-awards{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0;justify-content:center}
.tag{
  background:rgba(255,107,0,0.1);border:1px solid rgba(255,107,0,0.25);
  color:var(--primary-light);font-size:0.72rem;padding:3px 10px;border-radius:12px;
}
.expert-actions{display:flex;gap:8px;justify-content:center;margin-top:14px}

/* ================================================================
   评价卡片
================================================================ */
.reviews-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
}
.review-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:24px;
  transition:all var(--transition);
}
.review-card:hover{border-color:rgba(255,107,0,0.3);box-shadow:var(--shadow)}
.review-stars{color:var(--accent);font-size:1rem;margin-bottom:12px;letter-spacing:2px}
.review-text{font-size:0.9rem;color:var(--text-muted);line-height:1.8;margin-bottom:16px}
.review-author{display:flex;align-items:center;gap:12px}
.review-avatar{
  width:40px;height:40px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  display:flex;align-items:center;justify-content:center;
  font-weight:700;color:white;font-size:0.9rem;flex-shrink:0;
}
.review-name{font-size:0.9rem;font-weight:600;color:var(--text-light)}
.review-date{font-size:0.78rem;color:var(--text-dim)}

/* ================================================================
   FAQ
================================================================ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{
  border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:12px;overflow:hidden;transition:border-color var(--transition);
}
.faq-item:hover{border-color:rgba(255,107,0,0.3)}
.faq-question{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  padding:18px 22px;font-size:0.95rem;font-weight:600;
  color:var(--text-light);background:var(--bg-card);text-align:left;gap:12px;
  transition:color var(--transition);
}
.faq-question:hover{color:var(--primary)}
.faq-icon{
  flex-shrink:0;width:24px;height:24px;border-radius:50%;
  border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;
  font-size:1rem;color:var(--primary);transition:transform var(--transition);
}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-answer{
  max-height:0;overflow:hidden;
  transition:max-height 0.35s ease,padding 0.35s ease;
  background:rgba(255,107,0,0.03);
}
.faq-item.open .faq-answer{max-height:300px;padding:0 22px 18px}
.faq-answer p{font-size:0.9rem;color:var(--text-muted);line-height:1.8}

/* ================================================================
   分类标签栏
================================================================ */
.cat-tabs{
  display:flex;gap:10px;flex-wrap:wrap;margin-bottom:36px;
}
.cat-tab{
  padding:8px 20px;border-radius:20px;font-size:0.88rem;font-weight:500;
  border:1px solid var(--border);color:var(--text-muted);
  background:var(--bg-card);transition:all var(--transition);
}
.cat-tab:hover,.cat-tab.active{
  background:var(--primary);color:white;border-color:var(--primary);
}

/* ================================================================
   统计数据栏
================================================================ */
.stats-bar{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:1px;background:var(--border);border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--border);
}
.stat-item{
  background:var(--bg-card);padding:28px 20px;text-align:center;
}
.stat-num{display:block;font-size:2rem;font-weight:800;color:var(--primary);line-height:1}
.stat-label{display:block;font-size:0.82rem;color:var(--text-muted);margin-top:6px}

/* ================================================================
   合作品牌Logo墙
================================================================ */
.partners-row{
  display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center;
}
.partner-item{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius);padding:14px 24px;
  font-size:0.9rem;font-weight:600;color:var(--text-muted);
  transition:all var(--transition);
}
.partner-item:hover{border-color:var(--primary);color:var(--primary)}

/* ================================================================
   联系区域
================================================================ */
.contact-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;
}
.contact-items{display:flex;flex-direction:column;gap:16px;margin-top:24px}
.contact-item{display:flex;gap:14px;align-items:flex-start}
.contact-item .icon{
  width:36px;height:36px;background:rgba(255,107,0,0.1);
  border-radius:8px;display:flex;align-items:center;justify-content:center;
  font-size:1rem;flex-shrink:0;
}
.contact-item strong{color:var(--text-light);display:block;margin-bottom:2px}
.contact-item p,.contact-item span{font-size:0.88rem;color:var(--text-muted)}
.qr-group{display:flex;gap:20px;flex-wrap:wrap}
.qr-item{text-align:center}
.qr-item img{width:110px;height:110px;border-radius:10px;border:2px solid var(--border)}
.qr-item p{font-size:0.78rem;color:var(--text-muted);margin-top:8px;line-height:1.4}

/* ================================================================
   高亮框
================================================================ */
.highlight-box{
  background:rgba(255,107,0,0.05);border:1px solid rgba(255,107,0,0.2);
  border-radius:var(--radius-lg);padding:24px;
}
.notice-bar{
  background:linear-gradient(90deg,rgba(255,107,0,0.15),rgba(255,61,0,0.08));
  border-bottom:1px solid rgba(255,107,0,0.2);
  padding:10px 0;font-size:0.82rem;color:var(--primary-light);text-align:center;
}

/* ================================================================
   页面横幅
================================================================ */
.page-banner{
  background:linear-gradient(135deg,#1a0a00 0%,#0D0D0F 100%);
  border-bottom:1px solid var(--border);
  padding:52px 0;text-align:center;
}
.page-banner h1{font-size:clamp(1.8rem,4vw,3rem);font-weight:900;margin-bottom:12px}
.page-banner p{color:var(--text-muted);font-size:1rem}

/* ================================================================
   分享栏
================================================================ */
.share-bar{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  padding:20px 0;border-top:1px solid var(--border);
}
.share-bar span{font-size:0.85rem;color:var(--text-muted)}
.share-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 16px;border-radius:20px;font-size:0.82rem;font-weight:500;
  border:1px solid var(--border);color:var(--text-muted);
  transition:all var(--transition);
}
.share-btn:hover{border-color:var(--primary);color:var(--primary)}

/* ================================================================
   加入指南
================================================================ */
.join-steps{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;
}
.join-step{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:24px;text-align:center;
}
.step-num{
  width:44px;height:44px;border-radius:50%;
  background:var(--primary);color:white;font-weight:800;font-size:1.1rem;
  display:flex;align-items:center;justify-content:center;margin:0 auto 14px;
}
.step-title{font-size:0.95rem;font-weight:600;color:var(--text-light);margin-bottom:8px}
.step-desc{font-size:0.83rem;color:var(--text-muted);line-height:1.7}

/* ================================================================
   FOOTER
================================================================ */
#site-footer{
  background:#080809;border-top:1px solid var(--border);
  padding:52px 0 24px;
}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;
}
.footer-brand .logo-wrap{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand .logo-wrap img:first-child{width:32px;height:32px}
.footer-desc{font-size:0.85rem;color:var(--text-muted);line-height:1.8;margin-bottom:20px}
.footer-social{display:flex;gap:10px}
.social-icon{
  width:36px;height:36px;border-radius:8px;
  background:rgba(255,107,0,0.1);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  font-size:0.85rem;color:var(--text-muted);transition:all var(--transition);
}
.social-icon:hover{background:var(--primary);color:white;border-color:var(--primary)}
.footer-col h4{font-size:0.9rem;font-weight:700;color:var(--text-light);margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{font-size:0.85rem;color:var(--text-muted);transition:color var(--transition)}
.footer-col ul li a:hover{color:var(--primary)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;
  padding-top:24px;border-top:1px solid var(--border);
  font-size:0.82rem;color:var(--text-dim);
}
.footer-links{display:flex;gap:16px;flex-wrap:wrap}
.footer-links a{color:var(--text-dim);transition:color var(--transition)}
.footer-links a:hover{color:var(--primary)}
.footer-logo-bottom{display:flex;align-items:center;gap:8px;margin-bottom:8px}

/* ================================================================
   回顶按钮
================================================================ */
#scroll-top{
  position:fixed;bottom:28px;right:28px;z-index:900;
  width:44px;height:44px;border-radius:50%;
  background:var(--primary);color:white;font-size:1.1rem;
  box-shadow:0 4px 16px rgba(255,107,0,0.4);
  opacity:0;transform:translateY(20px);
  transition:all var(--transition);pointer-events:none;
}
#scroll-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
#scroll-top:hover{background:var(--primary-dark);transform:translateY(-3px)}

/* ================================================================
   视频弹窗
================================================================ */
.modal-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,0.85);
  z-index:2000;display:none;align-items:center;justify-content:center;
  backdrop-filter:blur(8px);
}
.modal-overlay.open{display:flex}
.modal-box{
  background:var(--bg-card);border-radius:var(--radius-lg);
  border:1px solid var(--border);padding:24px;
  max-width:760px;width:90%;position:relative;
}
.modal-close{
  position:absolute;top:14px;right:14px;
  width:32px;height:32px;border-radius:50%;
  background:rgba(255,255,255,0.1);color:var(--text-light);
  font-size:1.1rem;display:flex;align-items:center;justify-content:center;
  transition:background var(--transition);
}
.modal-close:hover{background:var(--primary)}
.modal-video{
  width:100%;aspect-ratio:16/9;background:#000;border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;
  color:var(--text-muted);font-size:0.9rem;margin-top:16px;
}
.modal-title{font-size:1rem;font-weight:600;color:var(--text-light);padding-right:40px}

/* ================================================================
   动画
================================================================ */
[data-animate]{opacity:0;transform:translateY(24px);transition:opacity 0.6s ease,transform 0.6s ease}
[data-animate].visible{opacity:1;transform:translateY(0)}

/* ================================================================
   响应式
================================================================ */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .contact-grid{grid-template-columns:1fr;gap:40px}
}
@media(max-width:768px){
  section{padding:52px 0}
  .main-nav{
    display:none;flex-direction:column;gap:4px;
    position:absolute;top:68px;left:0;right:0;
    background:rgba(13,13,15,0.98);border-bottom:1px solid var(--border);
    padding:16px 20px;
  }
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 16px;width:100%}
  .menu-toggle{display:flex}
  .search-bar{display:none}
  .hero{min-height:70vh}
  .hero-stats{gap:20px}
  .footer-grid{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
  .join-steps{grid-template-columns:1fr 1fr}
  .stats-bar{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;text-align:center}
}
@media(max-width:480px){
  .hero h1{font-size:1.8rem}
  .join-steps{grid-template-columns:1fr}
  .hero-actions{flex-direction:column}
  .hero-stats{flex-wrap:wrap;gap:16px}
}

/* ================================================================
   懒加载占位
================================================================ */
img[loading="lazy"]{background:var(--bg-card)}