/* ============================================================
   国产自拍 修车改装 · 主样式文件
   域名: y22dtz.cn | 原创工业风配色
   主色: 钢铁蓝 #1B3A6B | 电橙 #FF6B00 | 碳黑 #0D0D0D
   ============================================================ */

/* ---- CSS变量 ---- */
:root {
  --primary:       #FF6B00;
  --primary-dark:  #D95A00;
  --primary-light: #FF8C33;
  --secondary:     #1B3A6B;
  --secondary-dark:#0F2347;
  --accent:        #00C2FF;
  --bg-dark:       #0D0D0D;
  --bg-card:       #141414;
  --bg-surface:    #1A1A1A;
  --bg-elevated:   #222222;
  --text-primary:  #F5F5F5;
  --text-secondary:#AAAAAA;
  --text-muted:    #666666;
  --border:        rgba(255,107,0,0.15);
  --border-subtle: rgba(255,255,255,0.06);
  --gradient-main: linear-gradient(135deg, #FF6B00 0%, #D95A00 100%);
  --gradient-blue: linear-gradient(135deg, #1B3A6B 0%, #0F2347 100%);
  --gradient-hero: linear-gradient(135deg, #0D0D0D 0%, #1B3A6B 50%, #0D0D0D 100%);
  --shadow-card:   0 4px 24px rgba(0,0,0,0.5);
  --shadow-glow:   0 0 20px rgba(255,107,0,0.3);
  --radius-sm:     6px;
  --radius-md:     10px;
  --radius-lg:     16px;
  --radius-xl:     24px;
  --transition:    all 0.25s ease;
  --font-main:     'PingFang SC','Microsoft YaHei','Helvetica Neue',sans-serif;
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;font-size:16px;}
body{font-family:var(--font-main);background:var(--bg-dark);color:var(--text-primary);line-height:1.6;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;}

/* ---- 工业纹理背景 ---- */
body::before{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    repeating-linear-gradient(0deg,transparent,transparent 40px,rgba(255,107,0,0.015) 40px,rgba(255,107,0,0.015) 41px),
    repeating-linear-gradient(90deg,transparent,transparent 40px,rgba(255,107,0,0.015) 40px,rgba(255,107,0,0.015) 41px);
}

/* ---- 容器 ---- */
.container{max-width:1280px;margin:0 auto;padding:0 24px;position:relative;z-index:1;}
.container-wide{max-width:1440px;margin:0 auto;padding:0 24px;position:relative;z-index:1;}

/* ---- 顶部公告栏 ---- */
.top-bar{
  background:var(--gradient-main);
  padding:8px 0;font-size:13px;font-weight:600;
  text-align:center;letter-spacing:0.5px;
}
.top-bar a{color:#fff;text-decoration:underline;text-underline-offset:2px;}

/* ---- 导航栏 ---- */
.site-header{
  position:sticky;top:0;z-index:1000;
  background:rgba(13,13,13,0.95);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
  transition:var(--transition);
}
.site-header.scrolled{box-shadow:0 4px 30px rgba(0,0,0,0.6);}
.header-inner{display:flex;align-items:center;gap:24px;height:68px;}
.site-logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.site-logo img{height:44px;width:auto;}
.logo-text{font-size:22px;font-weight:900;letter-spacing:1px;
  background:var(--gradient-main);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.logo-sub{font-size:10px;color:var(--text-muted);letter-spacing:1px;margin-top:-2px;}
.main-nav{display:flex;align-items:center;gap:4px;flex:1;}
.nav-item{padding:8px 14px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;
  color:var(--text-secondary);transition:var(--transition);white-space:nowrap;}
.nav-item:hover,.nav-item.active{color:var(--primary);background:rgba(255,107,0,0.08);}
.nav-actions{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.nav-btn-login{padding:7px 18px;border:1px solid var(--border);border-radius:var(--radius-sm);
  font-size:13px;font-weight:600;color:var(--text-secondary);transition:var(--transition);}
.nav-btn-login:hover{border-color:var(--primary);color:var(--primary);}
.nav-btn-join{padding:8px 20px;background:var(--gradient-main);border-radius:var(--radius-sm);
  font-size:13px;font-weight:700;color:#fff;transition:var(--transition);}
.nav-btn-join:hover{transform:translateY(-1px);box-shadow:var(--shadow-glow);}
.hamburger{display:none;flex-direction:column;gap:5px;padding:8px;}
.hamburger span{display:block;width:22px;height:2px;background:var(--text-primary);border-radius:2px;transition:var(--transition);}

/* ---- 移动端菜单 ---- */
.mobile-menu{
  display:none;position:fixed;inset:0;z-index:999;
  background:rgba(13,13,13,0.98);backdrop-filter:blur(20px);
  flex-direction:column;padding:80px 32px 32px;gap:8px;
  overflow-y:auto;
}
.mobile-menu.open{display:flex;}
.mobile-menu-close{position:absolute;top:20px;right:24px;font-size:24px;color:var(--text-secondary);padding:8px;}
.mobile-menu .nav-item{font-size:18px;padding:14px 0;border-bottom:1px solid var(--border-subtle);}

/* ---- 搜索框 ---- */
.search-bar-wrapper{background:var(--bg-surface);border-bottom:1px solid var(--border-subtle);padding:12px 0;}
.search-form{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.search-input{
  flex:1;min-width:200px;padding:10px 16px;
  background:var(--bg-elevated);border:1px solid var(--border);
  border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;
  outline:none;transition:var(--transition);
}
.search-input::placeholder{color:var(--text-muted);}
.search-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(255,107,0,0.1);}
.search-tags{display:flex;gap:6px;flex-wrap:wrap;}
.search-tag{padding:4px 12px;background:rgba(255,107,0,0.08);border:1px solid rgba(255,107,0,0.2);
  border-radius:20px;font-size:12px;color:var(--primary);cursor:pointer;transition:var(--transition);}
.search-tag:hover{background:rgba(255,107,0,0.15);}
.search-btn{padding:10px 24px;background:var(--gradient-main);border-radius:var(--radius-sm);
  font-size:14px;font-weight:700;color:#fff;transition:var(--transition);flex-shrink:0;}
.search-btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-glow);}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius-sm);
  font-size:15px;font-weight:700;transition:var(--transition);cursor:pointer;border:none;}
.btn-primary{background:var(--gradient-main);color:#fff;}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-glow);}
.btn-secondary{background:var(--gradient-blue);color:#fff;}
.btn-secondary:hover{transform:translateY(-2px);box-shadow:0 0 20px rgba(27,58,107,0.4);}
.btn-outline{background:transparent;border:1.5px solid var(--primary);color:var(--primary);}
.btn-outline:hover{background:rgba(255,107,0,0.08);}
.btn-ghost{background:rgba(255,255,255,0.05);border:1px solid var(--border-subtle);color:var(--text-secondary);}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary);}

/* ---- 徽章 ---- */
.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700;letter-spacing:0.5px;}
.badge-hot{background:rgba(255,50,50,0.15);color:#FF5050;border:1px solid rgba(255,50,50,0.3);}
.badge-new{background:rgba(0,194,255,0.12);color:var(--accent);border:1px solid rgba(0,194,255,0.25);}
.badge-primary{background:rgba(255,107,0,0.12);color:var(--primary);border:1px solid rgba(255,107,0,0.25);}
.badge-live{background:rgba(255,50,50,0.15);color:#FF5050;border:1px solid rgba(255,50,50,0.3);animation:pulse-badge 1.5s infinite;}
@keyframes pulse-badge{0%,100%{opacity:1;}50%{opacity:0.6;}}

/* ---- Hero区 ---- */
.hero{position:relative;min-height:90vh;display:flex;align-items:center;overflow:hidden;}
.hero-bg{position:absolute;inset:0;z-index:0;}
.hero-bg img{width:100%;height:100%;object-fit:cover;object-position:center;}
.hero-bg::after{content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(13,13,13,0.92) 0%,rgba(27,58,107,0.6) 50%,rgba(13,13,13,0.85) 100%);}
.hero-content{position:relative;z-index:1;max-width:620px;}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;
  background:rgba(255,107,0,0.1);border:1px solid rgba(255,107,0,0.3);
  border-radius:20px;font-size:12px;font-weight:600;color:var(--primary);margin-bottom:20px;}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--primary);animation:pulse-dot 1.5s infinite;}
@keyframes pulse-dot{0%,100%{transform:scale(1);opacity:1;}50%{transform:scale(1.4);opacity:0.7;}}
.hero-title{font-size:clamp(2.5rem,5vw,4rem);font-weight:900;line-height:1.1;margin-bottom:20px;letter-spacing:-1px;}
.hero-subtitle{font-size:1.1rem;color:var(--text-secondary);margin-bottom:32px;line-height:1.7;max-width:520px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px;}
.hero-stats{display:flex;gap:32px;flex-wrap:wrap;}
.stat-item{text-align:center;}
.stat-num{display:block;font-size:1.8rem;font-weight:900;color:var(--primary);}
.stat-label{font-size:12px;color:var(--text-muted);}
.hero-visual{position:relative;z-index:1;}
.hero-video-preview{position:relative;border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid rgba(255,107,0,0.2);box-shadow:0 20px 60px rgba(0,0,0,0.7);}
.hero-play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(0,0,0,0.3);cursor:pointer;transition:var(--transition);}
.hero-play-btn:hover{background:rgba(0,0,0,0.1);}
.hero-play-btn svg{width:64px;height:64px;fill:#fff;filter:drop-shadow(0 4px 12px rgba(255,107,0,0.5));}

/* ---- Section通用 ---- */
.section{padding:80px 0;}
.section-sm{padding:48px 0;}
.section-header{text-align:center;margin-bottom:48px;}
.section-label{display:inline-flex;align-items:center;gap:6px;padding:5px 14px;
  background:rgba(255,107,0,0.08);border:1px solid rgba(255,107,0,0.2);
  border-radius:20px;font-size:12px;font-weight:700;color:var(--primary);
  letter-spacing:1px;margin-bottom:14px;}
.section-title{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:900;line-height:1.2;margin-bottom:14px;}
.section-desc{font-size:15px;color:var(--text-secondary);max-width:600px;margin:0 auto;line-height:1.7;}
.section-divider{width:60px;height:3px;background:var(--gradient-main);border-radius:2px;margin:20px auto 0;}
.text-gradient{background:var(--gradient-main);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}

/* ---- 视频卡片网格 ---- */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.video-grid-3{grid-template-columns:repeat(3,1fr);}
.video-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);
  overflow:hidden;transition:var(--transition);cursor:pointer;}
.video-card:hover{transform:translateY(-4px);border-color:rgba(255,107,0,0.3);box-shadow:var(--shadow-card);}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg-elevated);}
.video-thumb-player{width:100%;height:100%;object-fit:cover;display:block;}
.video-overlay{position:absolute;inset:0;background:rgba(0,0,0,0.45);
  display:flex;align-items:center;justify-content:center;opacity:0;transition:var(--transition);}
.video-card:hover .video-overlay{opacity:1;}
.play-btn-circle{width:52px;height:52px;border-radius:50%;background:rgba(255,107,0,0.9);
  display:flex;align-items:center;justify-content:center;transition:var(--transition);}
.play-btn-circle:hover{transform:scale(1.1);background:var(--primary);}
.play-btn-circle svg{width:20px;height:20px;fill:#fff;margin-left:3px;}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.8);
  color:#fff;font-size:11px;font-weight:700;padding:2px 7px;border-radius:4px;}
.video-badge-pos{position:absolute;top:8px;left:8px;}
.video-info{padding:14px;}
.video-title{font-size:13px;font-weight:600;line-height:1.4;margin-bottom:8px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.video-meta{display:flex;gap:12px;font-size:11px;color:var(--text-muted);margin-bottom:8px;}
.video-author{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-muted);}
.author-name{color:var(--text-secondary);}

/* ---- 功能卡片 ---- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.feature-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);
  padding:28px 24px;transition:var(--transition);}
.feature-card:hover{border-color:rgba(255,107,0,0.3);transform:translateY(-3px);box-shadow:var(--shadow-card);}
.feature-icon{font-size:36px;margin-bottom:16px;}
.feature-title{font-size:16px;font-weight:700;margin-bottom:10px;color:var(--text-primary);}
.feature-desc{font-size:13px;color:var(--text-secondary);line-height:1.7;}

/* ---- AI卡片 ---- */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.ai-card{background:linear-gradient(135deg,rgba(27,58,107,0.2),rgba(13,13,13,0.8));
  border:1px solid rgba(27,58,107,0.3);border-radius:var(--radius-md);padding:24px;transition:var(--transition);}
.ai-card:hover{border-color:rgba(0,194,255,0.4);box-shadow:0 0 20px rgba(0,194,255,0.1);}
.ai-icon{font-size:32px;margin-bottom:14px;}
.ai-title{font-size:15px;font-weight:700;margin-bottom:8px;color:var(--accent);}
.ai-desc{font-size:13px;color:var(--text-secondary);line-height:1.6;}

/* ---- 专家卡片 ---- */
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.expert-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden;transition:var(--transition);}
.expert-card:hover{border-color:rgba(255,107,0,0.3);box-shadow:var(--shadow-card);}
.expert-cover{height:200px;overflow:hidden;}
.expert-cover img{width:100%;height:100%;object-fit:cover;object-position:top;transition:var(--transition);}
.expert-card:hover .expert-cover img{transform:scale(1.04);}
.expert-body{padding:20px;}
.expert-name{font-size:17px;font-weight:800;margin-bottom:4px;}
.expert-role{font-size:12px;color:var(--primary);font-weight:600;margin-bottom:10px;}
.expert-desc{font-size:12px;color:var(--text-secondary);line-height:1.6;margin-bottom:12px;}
.expert-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px;}
.expert-tag{padding:3px 10px;background:rgba(255,107,0,0.08);border:1px solid rgba(255,107,0,0.2);
  border-radius:12px;font-size:11px;color:var(--primary);}
.expert-actions{display:flex;gap:8px;}
.expert-btn{padding:7px 14px;border-radius:var(--radius-sm);font-size:12px;font-weight:600;transition:var(--transition);}
.expert-btn-primary{background:var(--gradient-main);color:#fff;}
.expert-btn-primary:hover{box-shadow:var(--shadow-glow);}
.expert-btn-secondary{background:rgba(255,107,0,0.08);border:1px solid rgba(255,107,0,0.2);color:var(--primary);}
.expert-btn-secondary:hover{background:rgba(255,107,0,0.15);}

/* ---- 合作伙伴 ---- */
.partners-row{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;align-items:center;}

/* ---- 步骤列表 ---- */
.steps-list{display:flex;flex-direction:column;gap:16px;}
.step-item{display:flex;gap:16px;align-items:flex-start;}
.step-num{width:36px;height:36px;border-radius:50%;background:var(--gradient-main);
  display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;
  color:#fff;flex-shrink:0;}
.step-content{flex:1;}
.step-title{font-size:15px;font-weight:700;margin-bottom:4px;}
.step-desc{font-size:13px;color:var(--text-secondary);line-height:1.6;}

/* ---- 联系卡片 ---- */
.contact-info-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:28px;}
.contact-info-title{font-size:17px;font-weight:800;margin-bottom:20px;color:var(--primary);}
.contact-item{display:flex;gap:14px;align-items:flex-start;padding:12px 0;border-bottom:1px solid var(--border-subtle);}
.contact-item:last-child{border-bottom:none;}
.contact-icon{font-size:20px;flex-shrink:0;margin-top:2px;}
.contact-label{font-size:11px;color:var(--text-muted);margin-bottom:2px;}
.contact-value{font-size:14px;font-weight:600;color:var(--text-primary);}

/* ---- 评价卡片 ---- */
.reviews-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.review-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:20px;transition:var(--transition);}
.review-card:hover{border-color:rgba(255,107,0,0.2);}
.review-stars{color:#FFB800;font-size:14px;margin-bottom:10px;}
.review-text{font-size:13px;color:var(--text-secondary);line-height:1.7;margin-bottom:14px;}
.review-author{display:flex;align-items:center;gap:10px;}
.review-avatar{width:36px;height:36px;border-radius:50%;background:var(--gradient-main);
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff;flex-shrink:0;}
.review-name{font-size:13px;font-weight:600;}
.review-date{font-size:11px;color:var(--text-muted);}

/* ---- FAQ ---- */
.faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px;}
.faq-item{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden;}
.faq-question{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;
  font-size:15px;font-weight:600;cursor:pointer;transition:var(--transition);}
.faq-question:hover{color:var(--primary);}
.faq-item.open .faq-question{color:var(--primary);}
.faq-icon{font-size:18px;font-weight:400;color:var(--text-muted);transition:var(--transition);}
.faq-item.open .faq-icon{transform:rotate(45deg);color:var(--primary);}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease,padding 0.35s ease;}
.faq-item.open .faq-answer{max-height:300px;padding:0 20px 18px;}
.faq-answer p{font-size:14px;color:var(--text-secondary);line-height:1.7;}

/* ---- 分类标签 ---- */
.category-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px;}
.category-tab{padding:8px 18px;background:var(--bg-surface);border:1px solid var(--border-subtle);
  border-radius:var(--radius-sm);font-size:13px;font-weight:600;color:var(--text-secondary);transition:var(--transition);}
.category-tab.active,.category-tab:hover{background:rgba(255,107,0,0.1);border-color:rgba(255,107,0,0.3);color:var(--primary);}

/* ---- 标签云 ---- */
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px;}
.tag-item{padding:6px 14px;background:var(--bg-surface);border:1px solid var(--border-subtle);
  border-radius:20px;font-size:12px;color:var(--text-secondary);cursor:pointer;transition:var(--transition);}
.tag-item:hover{border-color:var(--primary);color:var(--primary);background:rgba(255,107,0,0.06);}

/* ---- 分页 ---- */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:40px;}
.page-btn{width:40px;height:40px;border-radius:var(--radius-sm);background:var(--bg-surface);
  border:1px solid var(--border-subtle);color:var(--text-secondary);font-size:14px;font-weight:600;transition:var(--transition);}
.page-btn.active,.page-btn:hover{background:var(--gradient-main);border-color:var(--primary);color:#fff;}

/* ---- 直播卡片 ---- */
.live-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.live-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);overflow:hidden;transition:var(--transition);}
.live-card:hover{border-color:rgba(255,107,0,0.3);transform:translateY(-3px);}
.live-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;}
.live-thumb img{width:100%;height:100%;object-fit:cover;}
.live-badge{position:absolute;top:8px;left:8px;background:#FF3232;color:#fff;
  font-size:10px;font-weight:700;padding:2px 8px;border-radius:4px;animation:pulse-badge 1.5s infinite;}
.live-viewers{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.75);
  color:#fff;font-size:11px;padding:2px 8px;border-radius:4px;}
.live-info{padding:10px 12px;}
.live-name{font-size:13px;font-weight:700;margin-bottom:2px;}
.live-topic{font-size:11px;color:var(--text-muted);}

/* ---- 面包屑 ---- */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted);padding:12px 0;}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb .sep{color:var(--text-muted);}
.breadcrumb .current{color:var(--text-primary);}

/* ---- 页面Hero ---- */
.page-hero{padding:60px 0;background:linear-gradient(135deg,var(--bg-dark) 0%,var(--secondary-dark) 100%);
  border-bottom:1px solid var(--border);}
.page-hero-title{font-size:clamp(1.8rem,3.5vw,2.8rem);font-weight:900;margin-bottom:12px;}
.page-hero-desc{font-size:15px;color:var(--text-secondary);max-width:600px;line-height:1.7;}

/* ---- 两列布局 ---- */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;}

/* ---- 公告栏 ---- */
.notice-bar{display:flex;align-items:center;gap:12px;padding:12px 16px;
  background:rgba(255,107,0,0.06);border:1px solid rgba(255,107,0,0.15);
  border-radius:var(--radius-sm);margin-bottom:24px;}
.notice-icon{font-size:18px;flex-shrink:0;}
.notice-text{font-size:13px;color:var(--text-secondary);}

/* ---- 分享栏 ---- */
.share-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.share-label{font-size:13px;color:var(--text-muted);}
.share-btn{padding:8px 16px;border-radius:var(--radius-sm);font-size:13px;font-weight:600;
  background:var(--bg-surface);border:1px solid var(--border-subtle);color:var(--text-secondary);transition:var(--transition);}
.share-btn:hover{border-color:var(--primary);color:var(--primary);}

/* ---- 页脚 ---- */
.site-footer{background:var(--bg-card);border-top:1px solid var(--border);padding:60px 0 0;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;}
.footer-brand{}
.footer-desc{font-size:13px;color:var(--text-muted);line-height:1.7;margin-bottom:16px;}
.footer-social{display:flex;gap:8px;}
.social-icon{width:36px;height:36px;border-radius:50%;background:var(--bg-elevated);
  border:1px solid var(--border-subtle);display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;color:var(--text-muted);transition:var(--transition);}
.social-icon:hover{border-color:var(--primary);color:var(--primary);}
.footer-col-title{font-size:14px;font-weight:700;color:var(--text-primary);margin-bottom:16px;
  padding-bottom:8px;border-bottom:1px solid var(--border-subtle);}
.footer-links{display:flex;flex-direction:column;gap:8px;}
.footer-link{font-size:13px;color:var(--text-muted);transition:var(--transition);}
.footer-link:hover{color:var(--primary);}
.footer-bottom{border-top:1px solid var(--border-subtle);padding:20px 0;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;}
.footer-copy p{font-size:12px;color:var(--text-muted);}
.footer-bottom-links{display:flex;gap:16px;}
.footer-bottom-link{font-size:12px;color:var(--text-muted);transition:var(--transition);}
.footer-bottom-link:hover{color:var(--primary);}

/* ---- 响应式 ---- */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr);}
  .reviews-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .expert-grid{grid-template-columns:repeat(2,1fr);}
  .ai-grid{grid-template-columns:repeat(2,1fr);}
  .feature-grid{grid-template-columns:repeat(2,1fr);}
  .hero .container>div{grid-template-columns:1fr!important;}
  .hero-visual{display:none;}
}
@media(max-width:768px){
  .main-nav,.nav-actions .nav-btn-login,.nav-actions .nav-btn-join{display:none;}
  .hamburger{display:flex;}
  .video-grid{grid-template-columns:repeat(2,1fr);}
  .live-grid{grid-template-columns:repeat(2,1fr);}
  .reviews-grid{grid-template-columns:1fr 1fr;}
  .expert-grid{grid-template-columns:1fr;}
  .two-col{grid-template-columns:1fr;}
  .feature-grid{grid-template-columns:1fr;}
  .ai-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .hero-title{font-size:2rem;}
  .section{padding:48px 0;}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr;}
  .live-grid{grid-template-columns:1fr;}
  .reviews-grid{grid-template-columns:1fr;}
  .hero-actions{flex-direction:column;}
  .hero-stats{gap:20px;}
  .container{padding:0 16px;}
}