/* ============================================================
   网红主播 | bmkdawr.cn - 主样式文件
   原创设计 · 赛车风格 · 深色主题
   ============================================================ */

/* ---- CSS变量 ---- */
:root {
  --color-bg: #0a0b0f;
  --color-bg2: #0f1117;
  --color-bg3: #141720;
  --color-card: #181c27;
  --color-card2: #1e2333;
  --color-border: rgba(255,255,255,0.07);
  --color-primary: #e8320a;
  --color-primary-dark: #c42a08;
  --color-primary-light: #ff5533;
  --color-accent: #f5a623;
  --color-white: #f0f2f8;
  --color-text: #c8cdd8;
  --color-text-muted: #7a8099;
  --color-heading: #e8eaf0;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 40px rgba(232,50,10,0.2);
  --transition: 0.25s ease;
  --font-main: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --container-max: 1280px;
  --header-h: 68px;
}

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

/* ---- 干扰标签隐藏 ---- */
.W46psl{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999;visibility:hidden;}

/* ---- 容器 ---- */
.container{max-width:var(--container-max);margin:0 auto;padding:0 24px;}

/* ---- 按钮 ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 22px;border-radius:var(--radius-sm);font-size:0.9rem;font-weight:600;transition:all var(--transition);white-space:nowrap;}
.btn-primary{background:var(--color-primary);color:#fff;}
.btn-primary:hover{background:var(--color-primary-light);color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px rgba(232,50,10,0.4);}
.btn-outline{background:transparent;color:var(--color-white);border:1.5px solid rgba(255,255,255,0.25);}
.btn-outline:hover{border-color:var(--color-primary);color:var(--color-primary);background:rgba(232,50,10,0.08);}
.btn-join{background:var(--color-primary);color:#fff;padding:8px 18px;font-size:0.82rem;border-radius:var(--radius-sm);}
.btn-join:hover{background:var(--color-primary-light);color:#fff;}
.btn-sm{padding:7px 14px;font-size:0.8rem;}

/* ---- Header ---- */
#e1DF6-header{position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--header-h);background:rgba(10,11,15,0.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--color-border);transition:background var(--transition),box-shadow var(--transition);}
#e1DF6-header.scrolled{background:rgba(10,11,15,0.98);box-shadow:0 4px 24px rgba(0,0,0,0.5);}
.header-inner{max-width:var(--container-max);margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;gap:20px;}
.logo-wrap{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0;}
.logo-img{width:42px;height:42px;border-radius:50%;object-fit:cover;border:2px solid var(--color-primary);}
.logo-text{font-size:1.3rem;font-weight:900;color:var(--color-white);letter-spacing:1px;}
.logo-text span{color:var(--color-primary);}
.main-nav{flex:1;display:flex;justify-content:center;}
.main-nav ul{display:flex;gap:2px;align-items:center;}
.main-nav ul li a{padding:6px 12px;font-size:0.85rem;color:var(--color-text);border-radius:var(--radius-sm);transition:all var(--transition);white-space:nowrap;}
.main-nav ul li a:hover,.main-nav ul li a.active{color:var(--color-primary);background:rgba(232,50,10,0.1);}
.header-right{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.hamburger{display:none;flex-direction:column;gap:5px;padding:6px;border-radius:var(--radius-sm);}
.hamburger span{display:block;width:22px;height:2px;background:var(--color-white);border-radius:2px;transition:all var(--transition);}

/* ---- 搜索栏 ---- */
.search-bar-wrap{position:fixed;top:var(--header-h);left:0;right:0;z-index:999;background:rgba(14,16,22,0.97);border-bottom:1px solid var(--color-border);padding:10px 0;}
.search-bar-inner{max-width:var(--container-max);margin:0 auto;padding:0 24px;}
.search-input-wrap{display:flex;gap:0;border-radius:var(--radius-sm);overflow:hidden;border:1.5px solid rgba(255,255,255,0.12);max-width:600px;}
.search-input{flex:1;background:rgba(255,255,255,0.05);border:none;outline:none;padding:9px 14px;color:var(--color-white);font-size:0.88rem;}
.search-input::placeholder{color:var(--color-text-muted);}
.search-btn{background:var(--color-primary);color:#fff;padding:9px 16px;font-size:1rem;border-radius:0;}
.search-btn:hover{background:var(--color-primary-light);}
.search-hot-tags{display:flex;align-items:center;gap:8px;margin-top:7px;flex-wrap:wrap;}
.search-hot-tags span{color:var(--color-text-muted);font-size:0.78rem;}
.search-hot-tags a{font-size:0.78rem;color:var(--color-text-muted);background:rgba(255,255,255,0.06);padding:3px 10px;border-radius:20px;transition:all var(--transition);}
.search-hot-tags a:hover{color:var(--color-primary);background:rgba(232,50,10,0.12);}
.search-toast{position:fixed;bottom:32px;left:50%;transform:translateX(-50%) translateY(20px);background:rgba(30,35,51,0.97);color:var(--color-white);padding:12px 24px;border-radius:var(--radius-md);font-size:0.88rem;z-index:9999;opacity:0;pointer-events:none;transition:all 0.3s ease;border:1px solid var(--color-border);}
.search-toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ---- 移动端导航 ---- */
.mobile-nav{position:fixed;top:var(--header-h);left:0;right:0;z-index:998;background:rgba(10,11,15,0.98);border-bottom:1px solid var(--color-border);padding:16px 24px;transform:translateY(-120%);transition:transform 0.3s ease;display:none;}
.mobile-nav.open{transform:translateY(0);}
.mobile-nav ul{display:flex;flex-direction:column;gap:4px;}
.mobile-nav ul li a{display:block;padding:10px 14px;color:var(--color-text);border-radius:var(--radius-sm);font-size:0.92rem;transition:all var(--transition);}
.mobile-nav ul li a:hover{color:var(--color-primary);background:rgba(232,50,10,0.1);}

/* ---- 主内容偏移 ---- */
main{padding-top:calc(var(--header-h) + 56px);}

/* ---- Hero区 ---- */
.hero-section{position:relative;min-height:calc(100vh - var(--header-h) - 56px);display:flex;flex-direction:column;justify-content:center;overflow:hidden;}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;background-repeat:no-repeat;transition:opacity 0.8s ease;}
.hero-bg.loaded{opacity:1;}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,11,15,0.88) 0%,rgba(10,11,15,0.6) 60%,rgba(10,11,15,0.4) 100%);}
.hero-content{position:relative;z-index:2;max-width:var(--container-max);margin:0 auto;padding:60px 24px 40px;}
.hero-badge{display:inline-block;background:rgba(232,50,10,0.15);border:1px solid rgba(232,50,10,0.4);color:var(--color-primary);padding:6px 16px;border-radius:20px;font-size:0.82rem;font-weight:600;margin-bottom:20px;letter-spacing:1px;}
.hero-title{font-size:clamp(2rem,5vw,3.8rem);font-weight:900;color:var(--color-heading);line-height:1.2;margin-bottom:20px;letter-spacing:-0.5px;}
.hero-title .highlight{color:var(--color-primary);}
.hero-subtitle{font-size:1rem;color:var(--color-text);max-width:600px;line-height:1.8;margin-bottom:32px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
.hero-stats{position:relative;z-index:2;max-width:var(--container-max);margin:0 auto;padding:0 24px 40px;display:flex;gap:0;flex-wrap:wrap;}
.hero-stat{flex:1;min-width:120px;padding:20px 24px;border-right:1px solid var(--color-border);text-align:center;}
.hero-stat:last-child{border-right:none;}
.hero-stat .num{display:block;font-size:1.8rem;font-weight:900;color:var(--color-primary);line-height:1;}
.hero-stat .label{display:block;font-size:0.78rem;color:var(--color-text-muted);margin-top:6px;}

/* ---- 通用section ---- */
.section{padding:72px 0;}
.section-alt{background:var(--color-bg2);}
.ai-section-bg{background:linear-gradient(135deg,#0a0b0f 0%,#0f1520 50%,#0a0b0f 100%);}
.section-header{text-align:center;margin-bottom:48px;}
.section-tag{display:inline-block;background:rgba(232,50,10,0.12);border:1px solid rgba(232,50,10,0.3);color:var(--color-primary);padding:4px 14px;border-radius:20px;font-size:0.78rem;font-weight:600;margin-bottom:12px;letter-spacing:1px;}
.section-title{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:900;color:var(--color-heading);margin-bottom:12px;line-height:1.3;}
.section-title .accent{color:var(--color-primary);}
.section-desc{color:var(--color-text-muted);font-size:0.95rem;max-width:700px;margin:0 auto;line-height:1.8;}

/* ---- 模块卡片网格 ---- */
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.module-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:28px 24px;transition:all var(--transition);}
.module-card:hover{border-color:rgba(232,50,10,0.3);box-shadow:var(--shadow-hover);transform:translateY(-4px);}
.module-icon{width:48px;height:48px;background:rgba(232,50,10,0.1);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin-bottom:16px;}
.module-title{font-size:1rem;font-weight:700;color:var(--color-heading);margin-bottom:10px;}
.module-desc{font-size:0.85rem;color:var(--color-text-muted);line-height:1.7;}

/* ---- 视频卡片网格 ---- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.video-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden;cursor:pointer;transition:all var(--transition);}
.video-card:hover{border-color:rgba(232,50,10,0.3);box-shadow:var(--shadow-hover);transform:translateY(-4px);}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--color-card2);}
.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-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0);transition:background var(--transition);}
.video-card:hover .video-play-btn{background:rgba(0,0,0,0.45);}
.play-icon{width:52px;height:52px;background:rgba(232,50,10,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(0.8);transition:all var(--transition);}
.play-icon::after{content:'';border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px;}
.video-card:hover .play-icon{opacity:1;transform:scale(1);}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.75);color:#fff;font-size:0.72rem;padding:2px 7px;border-radius:4px;font-weight:600;}
.video-tag{position:absolute;top:8px;left:8px;background:var(--color-primary);color:#fff;font-size:0.7rem;padding:2px 8px;border-radius:4px;font-weight:600;}
.video-info{padding:16px;}
.video-title{font-size:0.9rem;font-weight:700;color:var(--color-heading);margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.video-meta{display:flex;gap:12px;font-size:0.75rem;color:var(--color-text-muted);margin-bottom:8px;}
.video-stats{display:flex;gap:12px;font-size:0.75rem;color:var(--color-text-muted);}

/* ---- AI功能卡片 ---- */
.ai-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.ai-feature-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:36px 28px;text-align:center;transition:all var(--transition);}
.ai-feature-card:hover{border-color:rgba(232,50,10,0.3);box-shadow:var(--shadow-hover);transform:translateY(-6px);}
.ai-icon{font-size:2.8rem;margin-bottom:20px;display:block;}
.ai-title{font-size:1.1rem;font-weight:800;color:var(--color-heading);margin-bottom:14px;}
.ai-desc{font-size:0.88rem;color:var(--color-text-muted);line-height:1.8;}

/* ---- 专家卡片 ---- */
.experts-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.expert-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:28px 20px;text-align:center;transition:all var(--transition);}
.expert-card:hover{border-color:rgba(232,50,10,0.3);box-shadow:var(--shadow-hover);transform:translateY(-4px);}
.expert-avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;margin:0 auto 14px;border:3px solid var(--color-primary);}
.expert-name{font-size:1rem;font-weight:800;color:var(--color-heading);margin-bottom:6px;}
.expert-role{font-size:0.78rem;color:var(--color-primary);margin-bottom:12px;font-weight:600;}
.expert-bio{font-size:0.8rem;color:var(--color-text-muted);line-height:1.7;margin-bottom:14px;}
.expert-awards{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin-bottom:16px;}
.award-tag{background:rgba(232,50,10,0.1);border:1px solid rgba(232,50,10,0.25);color:var(--color-primary);font-size:0.7rem;padding:2px 8px;border-radius:20px;}
.expert-actions{display:flex;gap:8px;justify-content:center;}

/* ---- 品牌墙 ---- */
.brands-wall{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
.brand-item{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:12px 20px;font-size:0.85rem;color:var(--color-text-muted);font-weight:600;transition:all var(--transition);}
.brand-item:hover{border-color:var(--color-primary);color:var(--color-primary);}

/* ---- 加入步骤 ---- */
.join-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.step-item{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:28px 20px;text-align:center;transition:all var(--transition);}
.step-item:hover{border-color:rgba(232,50,10,0.3);}
.step-num{width:48px;height:48px;background:var(--color-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.3rem;font-weight:900;margin:0 auto 16px;}
.step-title{font-size:0.95rem;font-weight:700;color:var(--color-heading);margin-bottom:8px;}
.step-desc{font-size:0.82rem;color:var(--color-text-muted);line-height:1.7;}

/* ---- 联系区 ---- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
.contact-info-list{display:flex;flex-direction:column;gap:16px;}
.contact-info-item{display:flex;align-items:flex-start;gap:14px;background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:16px;}
.contact-icon{font-size:1.3rem;flex-shrink:0;margin-top:2px;}
.contact-label{font-size:0.75rem;color:var(--color-text-muted);margin-bottom:4px;}
.contact-value{font-size:0.9rem;color:var(--color-white);font-weight:600;}

/* ---- 联系表单 ---- */
.contact-form{display:flex;flex-direction:column;gap:16px;}
.form-group{display:flex;flex-direction:column;gap:6px;}
.form-label{font-size:0.82rem;color:var(--color-text-muted);font-weight:600;}
.form-input{background:var(--color-card);border:1.5px solid var(--color-border);border-radius:var(--radius-sm);padding:10px 14px;color:var(--color-white);font-size:0.88rem;outline:none;transition:border-color var(--transition);}
.form-input:focus{border-color:var(--color-primary);}
.form-input option{background:var(--color-card2);color:var(--color-white);}
.form-textarea{min-height:120px;resize:vertical;}

/* ---- 评价卡片 ---- */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.review-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:24px;}
.review-stars{color:var(--color-accent);font-size:0.9rem;margin-bottom:12px;}
.review-text{font-size:0.85rem;color:var(--color-text);line-height:1.8;margin-bottom:16px;font-style:italic;}
.review-author{display:flex;align-items:center;gap:12px;}
.review-avatar{width:36px;height:36px;background:var(--color-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.9rem;font-weight:700;color:#fff;flex-shrink:0;}
.review-name{font-size:0.85rem;font-weight:700;color:var(--color-heading);}
.review-date{font-size:0.75rem;color:var(--color-text-muted);}

/* ---- FAQ ---- */
.faq-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px;}
.faq-item{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);overflow:hidden;transition:border-color var(--transition);}
.faq-item.open{border-color:rgba(232,50,10,0.3);}
.faq-question{padding:18px 20px;font-size:0.92rem;font-weight:700;color:var(--color-heading);cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;transition:color var(--transition);}
.faq-question:hover{color:var(--color-primary);}
.faq-icon{font-size:1.2rem;color:var(--color-primary);flex-shrink:0;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;}
.faq-item.open .faq-answer{max-height:400px;padding:0 20px 18px;}
.faq-answer div{font-size:0.85rem;color:var(--color-text-muted);line-height:1.8;}

/* ---- 社区标签 ---- */
.community-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px;}
.tab-btn{background:var(--color-card);border:1.5px solid var(--color-border);color:var(--color-text-muted);padding:8px 16px;border-radius:20px;font-size:0.82rem;font-weight:600;transition:all var(--transition);}
.tab-btn.active,.tab-btn:hover{background:var(--color-primary);border-color:var(--color-primary);color:#fff;}

/* ---- 标签列表 ---- */
.tag-list{display:flex;gap:8px;flex-wrap:wrap;}
.tag{background:rgba(255,255,255,0.06);border:1px solid var(--color-border);color:var(--color-text-muted);padding:5px 12px;border-radius:20px;font-size:0.78rem;font-weight:600;}

/* ---- 分享栏 ---- */
.share-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.share-label{font-size:0.82rem;color:var(--color-text-muted);}
.share-btn{background:var(--color-card);border:1px solid var(--color-border);color:var(--color-text-muted);padding:7px 16px;border-radius:20px;font-size:0.82rem;font-weight:600;transition:all var(--transition);}
.share-btn:hover{border-color:var(--color-primary);color:var(--color-primary);}

/* ---- 分页 ---- */
.pagination{display:flex;gap:8px;justify-content:center;margin-top:40px;}
.page-btn{background:var(--color-card);border:1.5px solid var(--color-border);color:var(--color-text-muted);width:38px;height:38px;border-radius:var(--radius-sm);font-size:0.88rem;font-weight:600;transition:all var(--transition);}
.page-btn.active,.page-btn:hover{background:var(--color-primary);border-color:var(--color-primary);color:#fff;}

/* ---- QR码 ---- */
.qr-wrap{display:flex;gap:16px;flex-wrap:wrap;}
.qr-item{text-align:center;}
.qr-item img{border-radius:var(--radius-sm);border:2px solid var(--color-border);}
.qr-label{font-size:0.75rem;color:var(--color-text-muted);margin-top:6px;}

/* ---- 内页Hero ---- */
.inner-hero{background:linear-gradient(135deg,var(--color-bg3) 0%,var(--color-bg2) 100%);padding:48px 0 40px;border-bottom:1px solid var(--color-border);}
.inner-hero-title{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:900;color:var(--color-heading);margin:12px 0 14px;line-height:1.3;}
.inner-hero-desc{font-size:0.95rem;color:var(--color-text-muted);max-width:700px;line-height:1.8;}

/* ---- 面包屑 ---- */
.breadcrumb{display:flex;align-items:center;gap:6px;font-size:0.8rem;color:var(--color-text-muted);}
.breadcrumb a{color:var(--color-text-muted);transition:color var(--transition);}
.breadcrumb a:hover{color:var(--color-primary);}
.breadcrumb .sep{color:var(--color-border);}
.breadcrumb .current{color:var(--color-primary);}

/* ---- 时间线 ---- */
.timeline{max-width:700px;margin:0 auto;position:relative;}
.timeline::before{content:'';position:absolute;left:80px;top:0;bottom:0;width:2px;background:var(--color-border);}
.timeline-item{display:flex;gap:24px;margin-bottom:32px;position:relative;}
.timeline-year{width:80px;flex-shrink:0;font-size:1rem;font-weight:900;color:var(--color-primary);text-align:right;padding-top:4px;}
.timeline-content{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:20px;flex:1;}
.timeline-title{font-size:0.95rem;font-weight:700;color:var(--color-heading);margin-bottom:8px;}
.timeline-desc{font-size:0.83rem;color:var(--color-text-muted);line-height:1.7;}

/* ---- 视频弹窗 ---- */
.video-modal{position:fixed;inset:0;z-index:9000;background:rgba(0,0,0,0.85);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity 0.3s ease;}
.video-modal.open{opacity:1;pointer-events:all;}
.video-modal-inner{background:var(--color-card);border-radius:var(--radius-lg);padding:32px;max-width:640px;width:90%;position:relative;border:1px solid var(--color-border);}
.video-modal-close{position:absolute;top:14px;right:14px;width:32px;height:32px;background:rgba(255,255,255,0.1);border-radius:50%;color:var(--color-white);font-size:0.9rem;display:flex;align-items:center;justify-content:center;transition:background var(--transition);}
.video-modal-close:hover{background:var(--color-primary);}
.video-placeholder{aspect-ratio:16/9;background:var(--color-card2);border-radius:var(--radius-md);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;}
.big-play{width:72px;height:72px;background:var(--color-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;}
.big-play::after{content:'';border-left:26px solid #fff;border-top:16px solid transparent;border-bottom:16px solid transparent;margin-left:6px;}
.video-placeholder p{color:var(--color-white);font-size:0.95rem;font-weight:700;}

/* ---- Footer ---- */
#Y7kJx-footer{background:var(--color-bg3);border-top:1px solid var(--color-border);padding:56px 0 0;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px;margin-bottom:40px;}
.footer-brand p{font-size:0.83rem;color:var(--color-text-muted);line-height:1.8;margin:14px 0 20px;}
.footer-social{display:flex;gap:8px;}
.social-btn{width:34px;height:34px;background:var(--color-card);border:1px solid var(--color-border);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:0.75rem;font-weight:700;color:var(--color-text-muted);transition:all var(--transition);}
.social-btn:hover{background:var(--color-primary);border-color:var(--color-primary);color:#fff;}
.footer-col h4{font-size:0.9rem;font-weight:700;color:var(--color-heading);margin-bottom:16px;}
.footer-col ul{display:flex;flex-direction:column;gap:8px;}
.footer-col ul li a{font-size:0.82rem;color:var(--color-text-muted);transition:color var(--transition);}
.footer-col ul li a:hover{color:var(--color-primary);}
.footer-bottom{border-top:1px solid var(--color-border);padding:20px 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;}
.footer-bottom p{font-size:0.78rem;color:var(--color-text-muted);}
.footer-bottom p a{color:var(--color-text-muted);}
.footer-bottom p a:hover{color:var(--color-primary);}
.footer-links{display:flex;gap:16px;}
.footer-links a{font-size:0.78rem;color:var(--color-text-muted);transition:color var(--transition);}
.footer-links a:hover{color:var(--color-primary);}

/* ---- 响应式 ---- */
@media (max-width:1100px){
  .experts-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .join-steps{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:900px){
  .module-grid{grid-template-columns:repeat(2,1fr);}
  .video-grid{grid-template-columns:repeat(2,1fr);}
  .ai-features{grid-template-columns:1fr;}
  .reviews-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .main-nav{display:none;}
  .hamburger{display:flex;}
  .mobile-nav{display:block;}
  .hero-stats{flex-wrap:wrap;}
  .hero-stat{min-width:50%;border-right:none;border-bottom:1px solid var(--color-border);}
}
@media (max-width:640px){
  .module-grid{grid-template-columns:1fr;}
  .video-grid{grid-template-columns:1fr;}
  .experts-grid{grid-template-columns:1fr;}
  .join-steps{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .hero-actions{flex-direction:column;align-items:flex-start;}
  .hero-stat{min-width:100%;}
  .section{padding:48px 0;}
  .container{padding:0 16px;}
  .header-inner{padding:0 16px;}
  .search-bar-inner{padding:0 16px;}
  .inner-hero{padding:32px 0 28px;}
  .timeline::before{left:60px;}
  .timeline-year{width:60px;font-size:0.85rem;}
}