/* ============================================================
   黑丝 - 主样式文件 | y09g36.cn
   原创设计 © 2025 黑丝汽车改装社区
   ============================================================ */

/* ---- CSS变量 ---- */
:root {
  --color-primary: #6B21E8;
  --color-primary-dark: #4C0FAB;
  --color-primary-light: #9B59F5;
  --color-accent: #00D4FF;
  --color-accent2: #FF6B35;
  --color-bg: #0A0A14;
  --color-bg2: #12121F;
  --color-bg3: #1A1A2E;
  --color-card: #16162A;
  --color-text: #E8E8F0;
  --color-text-muted: #9090B0;
  --color-border: #2A2A45;
  --color-gold: #F5C518;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --radius: 12px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(107,33,232,0.18);
  --shadow-hover: 0 8px 40px rgba(107,33,232,0.35);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ---- 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(--color-bg);color:var(--color-text);line-height:1.7;overflow-x:hidden}
a{color:var(--color-primary-light);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--color-accent)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
button{cursor:pointer;border:none;outline:none;font-family:var(--font-main)}

/* ---- 隐藏干扰标签 ---- */
.y09g36-noise{display:none!important;visibility:hidden!important;position:absolute!important;width:0!important;height:0!important;overflow:hidden!important;pointer-events:none!important;opacity:0!important}

/* ---- 顶部公告栏 ---- */
.top-bar{background:linear-gradient(90deg,var(--color-primary-dark),var(--color-primary),var(--color-accent));padding:6px 0;text-align:center;font-size:13px;color:#fff;letter-spacing:0.5px}
.top-bar a{color:#fff;font-weight:600}

/* ---- Header ---- */
.site-header{background:rgba(10,10,20,0.97);backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:1000;transition:var(--transition)}
.header-inner{max-width:1280px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:70px}
.logo-wrap{display:flex;align-items:center;gap:12px;text-decoration:none}
.logo-img{width:44px;height:44px;object-fit:contain}
.logo-text{display:flex;flex-direction:column}
.logo-name{font-size:20px;font-weight:800;background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.2}
.logo-slogan{font-size:11px;color:var(--color-text-muted);letter-spacing:1px}

/* ---- 导航 ---- */
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{padding:8px 14px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;color:var(--color-text);transition:var(--transition);white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:rgba(107,33,232,0.2);color:var(--color-primary-light)}
.nav-btn{background:linear-gradient(135deg,var(--color-primary),var(--color-accent));color:#fff!important;padding:8px 18px!important;border-radius:20px!important;font-weight:600!important}
.nav-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(107,33,232,0.5)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.hamburger span{display:block;width:24px;height:2px;background:var(--color-text);border-radius:2px;transition:var(--transition)}

/* ---- 搜索框 ---- */
.search-bar-wrap{background:var(--color-bg2);border-bottom:1px solid var(--color-border);padding:10px 0}
.search-inner{max-width:1280px;margin:0 auto;padding:0 20px;display:flex;align-items:center;gap:10px}
.search-form{flex:1;max-width:600px;display:flex;align-items:center;background:var(--color-bg3);border:1px solid var(--color-border);border-radius:24px;overflow:hidden;transition:var(--transition)}
.search-form:focus-within{border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(107,33,232,0.15)}
.search-form input{flex:1;background:transparent;border:none;outline:none;padding:9px 18px;font-size:14px;color:var(--color-text);font-family:var(--font-main)}
.search-form input::placeholder{color:var(--color-text-muted)}
.search-btn{background:linear-gradient(135deg,var(--color-primary),var(--color-accent));border:none;padding:9px 20px;color:#fff;font-size:14px;cursor:pointer;transition:var(--transition)}
.search-btn:hover{opacity:0.9}
.search-tags{display:flex;gap:8px;flex-wrap:wrap}
.search-tag{font-size:12px;color:var(--color-text-muted);padding:3px 10px;border:1px solid var(--color-border);border-radius:12px;cursor:pointer;transition:var(--transition)}
.search-tag:hover{border-color:var(--color-primary-light);color:var(--color-primary-light)}

/* ---- 面包屑 ---- */
.breadcrumb{max-width:1280px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:8px;font-size:13px;color:var(--color-text-muted)}
.breadcrumb a{color:var(--color-text-muted)}
.breadcrumb a:hover{color:var(--color-primary-light)}
.breadcrumb span{color:var(--color-text-muted)}

/* ---- Hero Banner ---- */
.hero{position:relative;min-height:580px;display:flex;align-items:center;overflow:hidden;background:#0A0A14}
.hero-bg{position:absolute;inset:0;background-image:url('../images/hero-banner.jpg');background-size:cover;background-position:center;opacity:0.55;filter:saturate(1.2)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,10,20,0.85) 40%,rgba(107,33,232,0.25) 100%)}
.hero-content{position:relative;z-index:2;max-width:1280px;margin:0 auto;padding:60px 20px;width:100%}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(107,33,232,0.25);border:1px solid rgba(107,33,232,0.5);border-radius:20px;padding:5px 14px;font-size:12px;color:var(--color-primary-light);margin-bottom:20px;letter-spacing:0.5px}
.hero h1{font-size:clamp(28px,5vw,58px);font-weight:900;line-height:1.15;margin-bottom:16px}
.hero h1 .brand{background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:16px;color:var(--color-text-muted);max-width:560px;margin-bottom:32px;line-height:1.8}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-accent));color:#fff;padding:13px 30px;border-radius:24px;font-size:15px;font-weight:700;transition:var(--transition);display:inline-flex;align-items:center;gap:8px}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);color:#fff}
.btn-outline{background:transparent;color:var(--color-text);padding:13px 30px;border-radius:24px;font-size:15px;font-weight:600;border:1px solid var(--color-border);transition:var(--transition);display:inline-flex;align-items:center;gap:8px}
.btn-outline:hover{border-color:var(--color-primary-light);color:var(--color-primary-light);transform:translateY(-2px)}
.hero-stats{display:flex;gap:40px;margin-top:48px;flex-wrap:wrap}
.hero-stat{text-align:center}
.hero-stat .num{font-size:28px;font-weight:800;background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-stat .label{font-size:12px;color:var(--color-text-muted);margin-top:2px}

/* ---- 通用区块 ---- */
.section{padding:70px 0}
.section-alt{background:var(--color-bg2)}
.container{max-width:1280px;margin:0 auto;padding:0 20px}
.section-head{text-align:center;margin-bottom:50px}
.section-tag{display:inline-block;background:rgba(107,33,232,0.15);border:1px solid rgba(107,33,232,0.35);color:var(--color-primary-light);font-size:12px;padding:4px 14px;border-radius:12px;margin-bottom:12px;letter-spacing:1px}
.section-title{font-size:clamp(22px,3.5vw,36px);font-weight:800;margin-bottom:12px}
.section-title .accent{background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section-desc{color:var(--color-text-muted);font-size:15px;max-width:560px;margin:0 auto}

/* ---- 视频卡片 ---- */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.video-card{background:var(--color-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--color-border);transition:var(--transition);cursor:pointer}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(107,33,232,0.4)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#0d0d1a}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 0.4s ease}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.3);opacity:0;transition:var(--transition)}
.video-card:hover .play-btn{opacity:1}
.play-icon{width:56px;height:56px;background:rgba(107,33,232,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px);transition:transform 0.2s}
.video-card:hover .play-icon{transform:scale(1.1)}
.play-icon svg{width:22px;height:22px;fill:#fff;margin-left:3px}
.video-badge{position:absolute;top:10px;left:10px;background:rgba(107,33,232,0.85);color:#fff;font-size:11px;padding:3px 8px;border-radius:4px;backdrop-filter:blur(4px)}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,0.75);color:#fff;font-size:11px;padding:2px 7px;border-radius:4px}
.video-info{padding:14px}
.video-title{font-size:14px;font-weight:600;margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--color-text-muted)}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tags{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.video-tag{font-size:11px;background:rgba(107,33,232,0.12);color:var(--color-primary-light);padding:2px 8px;border-radius:10px;border:1px solid rgba(107,33,232,0.2)}

/* ---- 模态视频播放器 ---- */
.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:var(--color-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--color-border)}
.modal-close{position:absolute;top:14px;right:14px;z-index:10;background:rgba(0,0,0,0.6);border:none;color:#fff;width:36px;height:36px;border-radius:50%;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.modal-video{width:100%;aspect-ratio:16/9;background:#000}
.modal-video video{width:100%;height:100%;object-fit:contain}
.modal-info{padding:16px 20px}
.modal-title{font-size:16px;font-weight:700;margin-bottom:6px}
.modal-desc{font-size:13px;color:var(--color-text-muted)}

/* ---- 改装模块卡片 ---- */
.mod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.mod-card{background:var(--color-card);border-radius:var(--radius);padding:28px 22px;border:1px solid var(--color-border);transition:var(--transition);position:relative;overflow:hidden}
.mod-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));transform:scaleX(0);transform-origin:left;transition:transform 0.3s}
.mod-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(107,33,232,0.3)}
.mod-card:hover::before{transform:scaleX(1)}
.mod-icon{width:52px;height:52px;background:linear-gradient(135deg,rgba(107,33,232,0.2),rgba(0,212,255,0.1));border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:24px}
.mod-title{font-size:16px;font-weight:700;margin-bottom:8px}
.mod-desc{font-size:13px;color:var(--color-text-muted);line-height:1.7}

/* ---- 专家卡片 ---- */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:var(--color-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--color-border);transition:var(--transition)}
.expert-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.expert-img{width:100%;aspect-ratio:4/3;object-fit:cover;object-position:top}
.expert-body{padding:20px}
.expert-name{font-size:17px;font-weight:800;margin-bottom:4px}
.expert-role{font-size:12px;color:var(--color-primary-light);margin-bottom:10px;font-weight:600;letter-spacing:0.5px}
.expert-bio{font-size:13px;color:var(--color-text-muted);line-height:1.7;margin-bottom:14px}
.expert-awards{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.award-tag{font-size:11px;background:rgba(245,197,24,0.1);color:var(--color-gold);padding:2px 8px;border-radius:10px;border:1px solid rgba(245,197,24,0.2)}
.expert-btns{display:flex;gap:8px}
.btn-sm{padding:7px 14px;border-radius:8px;font-size:12px;font-weight:600;transition:var(--transition)}
.btn-sm-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-accent));color:#fff}
.btn-sm-outline{background:transparent;border:1px solid var(--color-border);color:var(--color-text-muted)}
.btn-sm-outline:hover{border-color:var(--color-primary-light);color:var(--color-primary-light)}

/* ---- 合作品牌墙 ---- */
.partner-grid{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:center}
.partner-item{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:14px 24px;font-size:14px;font-weight:700;color:var(--color-text-muted);transition:var(--transition);min-width:120px;text-align:center}
.partner-item:hover{border-color:var(--color-primary-light);color:var(--color-primary-light);transform:translateY(-2px)}

/* ---- 评价卡片 ---- */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:var(--color-card);border-radius:var(--radius);padding:22px;border:1px solid var(--color-border);transition:var(--transition)}
.review-card:hover{border-color:rgba(107,33,232,0.3);transform:translateY(-2px)}
.review-stars{color:var(--color-gold);font-size:14px;margin-bottom:10px;letter-spacing:2px}
.review-text{font-size:14px;color:var(--color-text);line-height:1.8;margin-bottom:14px;font-style:italic}
.reviewer{display:flex;align-items:center;gap:10px}
.reviewer-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;color:#fff;flex-shrink:0}
.reviewer-name{font-size:13px;font-weight:600}
.reviewer-info{font-size:11px;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-radius:var(--radius);border:1px solid var(--color-border);overflow:hidden}
.faq-q{padding:18px 22px;font-size:15px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}
.faq-q:hover{color:var(--color-primary-light)}
.faq-q .arrow{width:20px;height:20px;transition:transform 0.3s;color:var(--color-text-muted);flex-shrink:0}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 0.35s ease,padding 0.35s ease;font-size:14px;color:var(--color-text-muted);line-height:1.8;padding:0 22px}
.faq-item.open .faq-a{max-height:300px;padding:0 22px 18px}

/* ---- 联系区块 ---- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.contact-card{background:var(--color-card);border-radius:var(--radius);padding:28px;border:1px solid var(--color-border);text-align:center;transition:var(--transition)}
.contact-card:hover{border-color:rgba(107,33,232,0.4);transform:translateY(-3px);box-shadow:var(--shadow)}
.contact-icon{font-size:36px;margin-bottom:14px}
.contact-title{font-size:16px;font-weight:700;margin-bottom:8px}
.contact-val{font-size:14px;color:var(--color-primary-light);font-weight:600;margin-bottom:6px}
.contact-desc{font-size:12px;color:var(--color-text-muted)}
.qr-img{width:120px;height:120px;margin:12px auto 0;background:var(--color-bg3);border-radius:8px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.qr-img svg{width:100%;height:100%}

/* ---- 社交分享 ---- */
.share-bar{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:20px;font-size:13px;font-weight:600;transition:var(--transition);border:1px solid var(--color-border);color:var(--color-text-muted)}
.share-btn:hover{transform:translateY(-2px)}
.share-wechat:hover{border-color:#07C160;color:#07C160}
.share-weibo:hover{border-color:#E6162D;color:#E6162D}
.share-douyin:hover{border-color:#FE2C55;color:#FE2C55}
.share-bilibili:hover{border-color:#00A1D6;color:#00A1D6}

/* ---- AI赋能区 ---- */
.ai-section{background:linear-gradient(135deg,rgba(107,33,232,0.08),rgba(0,212,255,0.05));border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border)}
.ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.ai-img{border-radius:var(--radius);overflow:hidden;border:1px solid var(--color-border)}
.ai-img img{width:100%;height:100%;object-fit:cover}
.ai-features{display:flex;flex-direction:column;gap:16px;margin-top:24px}
.ai-feature{display:flex;align-items:flex-start;gap:14px;padding:16px;background:rgba(107,33,232,0.08);border-radius:var(--radius-sm);border:1px solid rgba(107,33,232,0.15)}
.ai-feature-icon{font-size:24px;flex-shrink:0;margin-top:2px}
.ai-feature-title{font-size:14px;font-weight:700;margin-bottom:4px}
.ai-feature-desc{font-size:13px;color:var(--color-text-muted)}

/* ---- 加入社区 ---- */
.join-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px;margin-bottom:40px}
.join-step{text-align:center;padding:24px 16px}
.step-num{width:48px;height:48px;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:800;color:#fff;margin:0 auto 14px}
.step-title{font-size:15px;font-weight:700;margin-bottom:6px}
.step-desc{font-size:13px;color:var(--color-text-muted)}

/* ---- 页脚 ---- */
.site-footer{background:var(--color-bg2);border-top:1px solid var(--color-border);padding:50px 0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .logo-wrap{margin-bottom:14px}
.footer-desc{font-size:13px;color:var(--color-text-muted);line-height:1.8;margin-bottom:16px}
.footer-social{display:flex;gap:10px}
.social-link{width:36px;height:36px;background:var(--color-bg3);border:1px solid var(--color-border);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;transition:var(--transition)}
.social-link:hover{border-color:var(--color-primary-light);transform:translateY(-2px)}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px;color:var(--color-text)}
.footer-col ul{display:flex;flex-direction:column;gap:8px}
.footer-col ul li a{font-size:13px;color:var(--color-text-muted);transition:var(--transition)}
.footer-col ul li a:hover{color:var(--color-primary-light)}
.footer-bottom{border-top:1px solid var(--color-border);padding-top:20px;display:flex;align-items:center;justify-content:space-between;flex-wrap:gap;gap:12px}
.footer-copy{font-size:12px;color:var(--color-text-muted)}
.footer-links{display:flex;gap:16px}
.footer-links a{font-size:12px;color:var(--color-text-muted)}
.footer-links a:hover{color:var(--color-primary-light)}
.update-time{font-size:12px;color:var(--color-text-muted)}

/* ---- 内页Hero ---- */
.inner-hero{background:linear-gradient(135deg,var(--color-bg2),var(--color-bg3));padding:50px 0;border-bottom:1px solid var(--color-border)}
.inner-hero h1{font-size:clamp(24px,4vw,42px);font-weight:800;margin-bottom:10px}
.inner-hero p{font-size:15px;color:var(--color-text-muted);max-width:560px}

/* ---- 分页 ---- */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:40px}
.page-btn{width:38px;height:38px;border-radius:8px;background:var(--color-card);border:1px solid var(--color-border);color:var(--color-text-muted);font-size:14px;display:flex;align-items:center;justify-content:center;transition:var(--transition);cursor:pointer}
.page-btn:hover,.page-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}

/* ---- 工具卡片 ---- */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.tool-card{background:var(--color-card);border-radius:var(--radius);padding:28px;border:1px solid var(--color-border);transition:var(--transition)}
.tool-card:hover{border-color:rgba(107,33,232,0.4);transform:translateY(-3px);box-shadow:var(--shadow)}
.tool-icon{font-size:40px;margin-bottom:16px}
.tool-name{font-size:17px;font-weight:700;margin-bottom:8px}
.tool-desc{font-size:13px;color:var(--color-text-muted);line-height:1.7;margin-bottom:16px}
.tool-link{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--color-primary-light)}
.tool-link:hover{color:var(--color-accent)}

/* ---- 移动端响应 ---- */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .ai-grid{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:70px;left:0;right:0;background:var(--color-bg2);border-bottom:1px solid var(--color-border);flex-direction:column;padding:12px 0;gap:0}
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 20px;border-radius:0}
  .hamburger{display:flex}
  .hero{min-height:420px}
  .hero-stats{gap:20px}
  .footer-grid{grid-template-columns:1fr}
  .search-tags{display:none}
  .header-inner{padding:0 14px}
  .video-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
  .expert-grid{grid-template-columns:1fr}
  .join-steps{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){
  .hero h1{font-size:24px}
  .hero-btns{flex-direction:column}
  .btn-primary,.btn-outline{width:100%;justify-content:center}
  .join-steps{grid-template-columns:1fr}
  .video-grid{grid-template-columns:1fr}
}

/* ---- 动画 ---- */
@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.6}}
.fade-in{animation:fadeInUp 0.6s ease both}
.pulse{animation:pulse 2s infinite}

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

/* ---- 选中 ---- */
::selection{background:rgba(107,33,232,0.3);color:#fff}