/* ===== 全局重置与基础样式 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --clr-primary:#C41E3A;
  --clr-secondary:#FF6B35;
  --clr-accent:#7B2D8E;
  --clr-dark:#0d1117;
  --clr-darker:#060a10;
  --clr-surface:#161b22;
  --clr-surface-alt:#1c2230;
  --clr-text:#e6edf3;
  --clr-text-muted:#8b949e;
  --clr-border:#30363d;
  --clr-gradient:linear-gradient(135deg,var(--clr-primary),var(--clr-secondary));
  --clr-gradient-accent:linear-gradient(135deg,var(--clr-accent),var(--clr-primary));
  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;
  --shadow-card:0 4px 24px rgba(0,0,0,.35);
  --shadow-hover:0 8px 40px rgba(196,30,58,.25);
  --font-body:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',sans-serif;
  --max-w:1200px;
  --transition:all .3s cubic-bezier(.4,0,.2,1);
}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-body);background:var(--clr-darker);color:var(--clr-text);line-height:1.75;overflow-x:hidden}
a{color:var(--clr-secondary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--clr-primary)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{line-height:1.3;font-weight:700}

/* ===== 容器 ===== */
.container{width:92%;max-width:var(--max-w);margin:0 auto}

/* ===== 顶部导航（非sticky） ===== */
.site-header{background:var(--clr-dark);border-bottom:1px solid var(--clr-border);position:relative;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0;flex-wrap:wrap}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{width:42px;height:42px;border-radius:var(--radius-sm)}
.logo-wrap .brand-name{font-size:1.25rem;font-weight:800;background:var(--clr-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.main-nav{display:flex;gap:4px;flex-wrap:wrap}
.main-nav a{padding:8px 14px;border-radius:var(--radius-sm);font-size:.9rem;color:var(--clr-text-muted);transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{background:var(--clr-surface);color:var(--clr-text)}
.mobile-toggle{display:none;background:none;border:2px solid var(--clr-border);color:var(--clr-text);padding:6px 10px;border-radius:var(--radius-sm);cursor:pointer;font-size:1.2rem}

/* ===== Hero区域 ===== */
.hero-section{position:relative;min-height:420px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--clr-dark)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.45}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,16,.6) 0%,rgba(6,10,16,.95) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;padding:60px 20px}
.hero-content h1{font-size:2.4rem;margin-bottom:16px;background:var(--clr-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-content p{font-size:1.1rem;color:var(--clr-text-muted);max-width:680px;margin:0 auto 28px}
.btn-cta{display:inline-block;padding:14px 36px;background:var(--clr-gradient);color:#fff;border-radius:50px;font-weight:700;font-size:1rem;transition:var(--transition);border:none;cursor:pointer}
.btn-cta:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);color:#fff}

/* ===== 区块标题 ===== */
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.8rem;margin-bottom:8px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:var(--clr-gradient);margin:10px auto 0;border-radius:2px}
.section-title p{color:var(--clr-text-muted);font-size:.95rem;margin-top:8px}

/* ===== 通用区块 ===== */
.section{padding:60px 0}
.section-alt{background:var(--clr-dark)}

/* ===== 视频卡片网格 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.video-card{background:var(--clr-surface);border-radius:var(--radius-md);overflow:hidden;transition:var(--transition);border:1px solid var(--clr-border)}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--clr-primary)}
.video-card .thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#111}
.video-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .thumb img{transform:scale(1.06)}
.video-card .play-icon{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}
.video-card .play-icon span{width:52px;height:52px;background:rgba(196,30,58,.85);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.video-card:hover .play-icon span{background:var(--clr-primary);transform:scale(1.1)}
.play-icon .tri{width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.video-card .card-body{padding:16px}
.video-card .card-body h3{font-size:1rem;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-card .card-body .meta{font-size:.8rem;color:var(--clr-text-muted);display:flex;gap:12px}

/* ===== 视频播放器区域 ===== */
.video-player-wrap{position:relative;aspect-ratio:16/9;background:#000;border-radius:var(--radius-md);overflow:hidden;max-width:800px;margin:0 auto}
.video-player-wrap video{width:100%;height:100%}
.video-player-wrap .play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.4);cursor:pointer;transition:var(--transition)}
.video-player-wrap .play-overlay:hover{background:rgba(0,0,0,.25)}
.play-overlay .big-play{width:80px;height:80px;background:var(--clr-gradient);border-radius:50%;display:flex;align-items:center;justify-content:center}
.big-play .tri-lg{width:0;height:0;border-style:solid;border-width:16px 0 16px 28px;border-color:transparent transparent transparent #fff;margin-left:5px}

/* ===== 关于我们 ===== */
.about-block{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.about-text{font-size:.95rem;line-height:1.9}
.about-text p{margin-bottom:16px}
.about-sidebar{background:var(--clr-surface);border-radius:var(--radius-md);padding:28px;border:1px solid var(--clr-border)}
.about-sidebar h3{font-size:1.1rem;margin-bottom:16px;color:var(--clr-secondary)}
.about-sidebar ul li{padding:8px 0;border-bottom:1px solid var(--clr-border);font-size:.9rem;color:var(--clr-text-muted)}
.about-sidebar ul li:last-child{border-bottom:none}

/* ===== 评论模块 ===== */
.reviews-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.review-card{background:var(--clr-surface);border-radius:var(--radius-md);padding:24px;border:1px solid var(--clr-border);transition:var(--transition)}
.review-card:hover{border-color:var(--clr-primary)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:var(--clr-gradient);display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:700;color:#fff;flex-shrink:0}
.review-info .name{font-weight:600;font-size:.95rem}
.review-info .city{font-size:.8rem;color:var(--clr-text-muted)}
.review-stars{color:#FFB800;font-size:.9rem;margin-bottom:8px;letter-spacing:2px}
.review-text{font-size:.9rem;color:var(--clr-text-muted);line-height:1.7}
.review-date{font-size:.75rem;color:var(--clr-text-muted);margin-top:10px;text-align:right}

/* ===== 注册模块 ===== */
.register-section{background:var(--clr-surface);border-radius:var(--radius-lg);padding:48px;text-align:center;border:1px solid var(--clr-border)}
.register-form{max-width:480px;margin:24px auto 0;display:flex;flex-direction:column;gap:14px}
.register-form input,.register-form select{padding:14px 18px;border:1px solid var(--clr-border);background:var(--clr-dark);color:var(--clr-text);border-radius:var(--radius-sm);font-size:.95rem;transition:var(--transition)}
.register-form input:focus,.register-form select:focus{outline:none;border-color:var(--clr-primary);box-shadow:0 0 0 3px rgba(196,30,58,.15)}
.register-form .btn-cta{width:100%}

/* ===== 上传模块 ===== */
.upload-zone{border:2px dashed var(--clr-border);border-radius:var(--radius-lg);padding:60px 30px;text-align:center;transition:var(--transition);cursor:pointer;background:var(--clr-surface)}
.upload-zone:hover{border-color:var(--clr-primary);background:rgba(196,30,58,.05)}
.upload-icon{font-size:3rem;margin-bottom:16px;opacity:.6}
.upload-zone p{color:var(--clr-text-muted);font-size:.95rem}

/* ===== 授权模块 ===== */
.auth-banner{background:var(--clr-gradient-accent);border-radius:var(--radius-lg);padding:40px;display:flex;align-items:center;gap:30px;flex-wrap:wrap}
.auth-badge{flex-shrink:0;width:120px;height:120px;background:rgba(255,255,255,.15);border-radius:50%;display:flex;align-items:center;justify-content:center;border:3px solid rgba(255,255,255,.3)}
.auth-badge img{width:70px;height:70px;border-radius:50%}
.auth-info{flex:1;min-width:260px}
.auth-info h3{font-size:1.3rem;margin-bottom:10px;color:#fff}
.auth-info p{font-size:.9rem;color:rgba(255,255,255,.85);line-height:1.7}

/* ===== 新闻模块 ===== */
.news-list{display:flex;flex-direction:column;gap:20px}
.news-item{display:flex;gap:20px;background:var(--clr-surface);border-radius:var(--radius-md);overflow:hidden;border:1px solid var(--clr-border);transition:var(--transition)}
.news-item:hover{border-color:var(--clr-primary)}
.news-item .news-img{width:200px;flex-shrink:0;overflow:hidden}
.news-item .news-img img{width:100%;height:100%;object-fit:cover}
.news-item .news-body{padding:20px;flex:1}
.news-item .news-body h3{font-size:1.05rem;margin-bottom:8px}
.news-item .news-body p{font-size:.88rem;color:var(--clr-text-muted);line-height:1.7;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.news-item .news-body .news-date{font-size:.78rem;color:var(--clr-text-muted);margin-top:10px}

/* ===== FAQ ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--clr-border);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;background:var(--clr-surface)}
.faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.95rem;transition:var(--transition)}
.faq-q:hover{color:var(--clr-secondary)}
.faq-q .arrow{transition:transform .3s;font-size:1.2rem}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s;font-size:.9rem;color:var(--clr-text-muted);line-height:1.8}
.faq-item.open .faq-a{max-height:500px;padding:0 24px 18px}

/* ===== 客户支持 ===== */
.support-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.support-card{background:var(--clr-surface);border-radius:var(--radius-md);padding:28px;text-align:center;border:1px solid var(--clr-border);transition:var(--transition)}
.support-card:hover{border-color:var(--clr-primary);transform:translateY(-3px)}
.support-card .icon{font-size:2rem;margin-bottom:12px}
.support-card h4{font-size:1rem;margin-bottom:6px}
.support-card p{font-size:.85rem;color:var(--clr-text-muted)}

/* ===== 页脚 ===== */
.site-footer{background:var(--clr-dark);border-top:1px solid var(--clr-border);padding:48px 0 24px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;margin-bottom:32px}
.footer-col h4{font-size:1rem;margin-bottom:16px;color:var(--clr-text)}
.footer-col a{display:block;padding:4px 0;font-size:.88rem;color:var(--clr-text-muted);transition:var(--transition)}
.footer-col a:hover{color:var(--clr-secondary);padding-left:6px}
.footer-bottom{border-top:1px solid var(--clr-border);padding-top:20px;text-align:center;font-size:.8rem;color:var(--clr-text-muted)}
.footer-social{display:flex;gap:12px;margin-top:10px;justify-content:center}
.footer-social a{width:36px;height:36px;border-radius:50%;background:var(--clr-surface);display:flex;align-items:center;justify-content:center;font-size:.9rem;color:var(--clr-text-muted);transition:var(--transition);border:1px solid var(--clr-border)}
.footer-social a:hover{background:var(--clr-primary);color:#fff;border-color:var(--clr-primary)}

/* ===== 面包屑 ===== */
.breadcrumb{padding:14px 0;font-size:.85rem;color:var(--clr-text-muted)}
.breadcrumb a{color:var(--clr-text-muted)}
.breadcrumb a:hover{color:var(--clr-secondary)}
.breadcrumb span{margin:0 6px;opacity:.5}

/* ===== 内页内容 ===== */
.article-content{max-width:860px;margin:0 auto}
.article-content h1{font-size:1.8rem;margin-bottom:20px}
.article-content h2{font-size:1.4rem;margin:32px 0 16px;padding-bottom:8px;border-bottom:2px solid var(--clr-border)}
.article-content p{margin-bottom:16px;font-size:.95rem;line-height:1.9}
.article-content .img-wrap{margin:24px 0;border-radius:var(--radius-md);overflow:hidden}
.article-content .img-wrap img{width:100%;border-radius:var(--radius-md)}

/* ===== APP下载页 ===== */
.app-hero{text-align:center;padding:80px 20px}
.app-hero h1{font-size:2.2rem;margin-bottom:16px;background:var(--clr-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.app-hero p{color:var(--clr-text-muted);max-width:600px;margin:0 auto 32px;font-size:1rem}
.app-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.app-btn{display:inline-flex;align-items:center;gap:10px;padding:14px 28px;border-radius:var(--radius-md);font-weight:600;font-size:1rem;transition:var(--transition);border:2px solid var(--clr-border);color:var(--clr-text);background:var(--clr-surface)}
.app-btn:hover{border-color:var(--clr-primary);color:var(--clr-primary);transform:translateY(-2px)}
.app-btn.primary{background:var(--clr-gradient);border:none;color:#fff}
.app-btn.primary:hover{box-shadow:var(--shadow-hover);color:#fff}
.app-features{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px;margin-top:48px}
.app-feature-card{background:var(--clr-surface);border-radius:var(--radius-md);padding:28px;border:1px solid var(--clr-border);text-align:center}
.app-feature-card .feat-icon{font-size:2.4rem;margin-bottom:12px}
.app-feature-card h3{font-size:1.05rem;margin-bottom:8px}
.app-feature-card p{font-size:.88rem;color:var(--clr-text-muted)}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .header-inner{gap:10px}
  .main-nav{display:none;width:100%;flex-direction:column;gap:0;background:var(--clr-surface);border-radius:var(--radius-sm);margin-top:8px}
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 16px;border-bottom:1px solid var(--clr-border)}
  .mobile-toggle{display:block}
  .hero-content h1{font-size:1.6rem}
  .hero-content p{font-size:.95rem}
  .about-block{grid-template-columns:1fr}
  .news-item{flex-direction:column}
  .news-item .news-img{width:100%;height:180px}
  .auth-banner{flex-direction:column;text-align:center}
  .video-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .reviews-grid{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.4rem}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .app-buttons{flex-direction:column;align-items:center}
}