/* ============================================
   无限臀山 - 全局样式表
   原创配色：深紫 #1a0a2e + 电橙 #ff6b2b + 霓虹蓝 #00d4ff
   定位：游戏解说公司 + 视频社区
   ============================================ */

/* --- CSS变量 --- */
:root {
  --bg-dark: #0d0b1a;
  --bg-card: #1a1530;
  --bg-card-hover: #231e3d;
  --primary: #7c3aed;
  --primary-light: #a78bfa;
  --accent: #ff6b2b;
  --accent2: #00d4ff;
  --accent3: #f59e0b;
  --text: #e2e0ea;
  --text-dim: #9b97b0;
  --text-white: #ffffff;
  --border: #2d2650;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(124,58,237,0.15);
  --shadow-lg: 0 8px 40px rgba(124,58,237,0.25);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font: 'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --max-w: 1240px;
}

/* --- Reset --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font);background:var(--bg-dark);color:var(--text);line-height:1.7;overflow-x:hidden}
a{color:var(--accent2);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{color:var(--text-white);line-height:1.3;font-weight:700}

/* --- 工具类 --- */
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}
.text-center{text-align:center}
.text-accent{color:var(--accent)}
.text-cyan{color:var(--accent2)}
.text-white{color:var(--text-white)}
.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-40{margin-top:40px}
.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.mb-40{margin-bottom:40px}
.flex{display:flex}.flex-center{display:flex;align-items:center;justify-content:center}
.gap-12{gap:12px}.gap-16{gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* --- 按钮 --- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:var(--radius);font-size:0.95rem;font-weight:600;cursor:pointer;border:none;transition:var(--transition);text-align:center}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--primary));color:#fff;box-shadow:0 4px 16px rgba(255,107,43,0.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 24px rgba(255,107,43,0.45);color:#fff}
.btn-outline{background:transparent;color:var(--accent2);border:2px solid var(--accent2)}
.btn-outline:hover{background:var(--accent2);color:var(--bg-dark)}
.btn-sm{padding:8px 18px;font-size:0.85rem}

/* --- 顶部公告栏 --- */
#top-notice{background:linear-gradient(90deg,var(--primary),var(--accent));color:#fff;text-align:center;font-size:0.82rem;padding:7px 20px;position:relative;z-index:1001}
#top-notice a{color:#fff;text-decoration:underline}

/* --- 头部导航 --- */
.site-header{background:rgba(13,11,26,0.95);backdrop-filter:blur(12px);position:sticky;top:0;z-index:1000;border-bottom:1px solid var(--border);transition:var(--transition)}
.site-header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,0.5)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0;max-width:var(--max-w);margin:0 auto;padding-left:20px;padding-right:20px}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:42px;width:auto;border-radius:6px}
.logo-text{font-size:1.35rem;font-weight:800;color:var(--text-white)}
.logo-text span{color:var(--accent)}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{color:var(--text);padding:8px 14px;border-radius:var(--radius-sm);font-size:0.9rem;font-weight:500;transition:var(--transition)}
.main-nav a:hover,.main-nav a.active{color:var(--accent);background:rgba(255,107,43,0.1)}
.menu-toggle{display:none;background:none;border:none;color:var(--text-white);font-size:1.5rem;cursor:pointer;padding:8px}

/* --- 搜索栏 --- */
.search-bar-section{background:var(--bg-card);border-bottom:1px solid var(--border);padding:12px 0}
.search-bar-inner{max-width:var(--max-w);margin:0 auto;padding:0 20px}
.search-form{display:flex;align-items:center;max-width:560px;margin:0 auto;background:var(--bg-dark);border:2px solid var(--border);border-radius:50px;overflow:hidden;transition:var(--transition)}
.search-form:focus-within{border-color:var(--accent2);box-shadow:0 0 16px rgba(0,212,255,0.2)}
.search-form input{flex:1;background:transparent;border:none;color:var(--text-white);padding:10px 20px;font-size:0.95rem;outline:none}
.search-form input::placeholder{color:var(--text-dim)}
.search-form button{background:linear-gradient(135deg,var(--accent),var(--primary));color:#fff;border:none;padding:10px 24px;cursor:pointer;font-size:0.9rem;font-weight:600;transition:var(--transition)}
.search-form button:hover{opacity:0.9}
.search-icon{margin-right:4px}

/* --- Hero Banner --- */
.hero{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,11,26,0.92) 0%,rgba(124,58,237,0.6) 50%,rgba(255,107,43,0.4) 100%);z-index:1}
.hero-content{position:relative;z-index:2;max-width:var(--max-w);margin:0 auto;padding:60px 20px;width:100%}
.hero-badge{display:inline-block;background:rgba(255,107,43,0.2);color:var(--accent);padding:6px 16px;border-radius:50px;font-size:0.82rem;font-weight:600;margin-bottom:16px;border:1px solid rgba(255,107,43,0.3)}
.hero h1{font-size:2.6rem;margin-bottom:12px;line-height:1.2}
.hero h1 span{color:var(--accent)}
.hero-desc{font-size:1.1rem;color:var(--text);max-width:640px;margin-bottom:28px;line-height:1.8}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}

/* --- 快速锚点导航 --- */
.anchor-nav{background:var(--bg-card);border-bottom:1px solid var(--border);padding:10px 0;overflow-x:auto}
.quick-nav{display:flex;align-items:center;gap:8px;max-width:var(--max-w);margin:0 auto;padding:0 20px;flex-wrap:nowrap}
.quick-nav a{white-space:nowrap;padding:6px 16px;border-radius:50px;font-size:0.82rem;color:var(--text-dim);background:rgba(124,58,237,0.1);border:1px solid transparent;transition:var(--transition)}
.quick-nav a:hover{color:var(--accent);border-color:var(--accent);background:rgba(255,107,43,0.1)}

/* --- 通用Section --- */
.section{padding:60px 0}
.section-sm{padding:40px 0}
.section-dark{background:var(--bg-dark)}
.section-card{background:var(--bg-card)}
.section-gradient{background:linear-gradient(180deg,var(--bg-dark) 0%,#140e28 100%)}
.section-primary{background:linear-gradient(135deg,var(--primary),#4c1d95)}
.section-title{font-size:1.8rem;margin-bottom:8px}
.section-title span{color:var(--accent)}
.section-subtitle{color:var(--text-dim);font-size:0.95rem;margin-bottom:32px}
.title-line{width:60px;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:2px;margin:12px auto 0}
.title-accent{color:var(--accent)}

/* --- 视频卡片 --- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:var(--transition);cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.video-thumb{position:relative;padding-top:56.25%;overflow:hidden;background:#0d0b1a}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform 0.5s ease}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0.8);width:60px;height:60px;background:rgba(255,107,43,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:var(--transition);box-shadow:0 4px 20px rgba(255,107,43,0.5)}
.video-card:hover .video-play-btn{opacity:1;transform:translate(-50%,-50%) scale(1)}
.play-icon{width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-badge{position:absolute;top:10px;left:10px;background:var(--accent);color:#fff;padding:3px 10px;border-radius:4px;font-size:0.72rem;font-weight:600}
.video-duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,0.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:0.75rem}
.video-info{padding:14px 16px}
.video-title{font-size:0.95rem;font-weight:600;color:var(--text-white);margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:12px;font-size:0.78rem;color:var(--text-dim);margin-bottom:8px}
.video-tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{padding:3px 10px;border-radius:4px;font-size:0.72rem;background:rgba(124,58,237,0.15);color:var(--primary-light)}
.tag-game{background:rgba(0,212,255,0.12);color:var(--accent2)}
.tag-hot{background:rgba(255,107,43,0.15);color:var(--accent)}

/* --- 数据统计 --- */
.stats-row{display:flex;justify-content:center;gap:48px;flex-wrap:wrap;padding:20px 0}
.stat-item{text-align:center}
.stat-num{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-label{font-size:0.85rem;color:var(--text-dim);margin-top:4px}

/* --- 专家卡片 --- */
.expert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.expert-card{background:var(--bg-card);border-radius:var(--radius);padding:28px 20px;text-align:center;border:1px solid var(--border);transition:var(--transition)}
.expert-card:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.expert-avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;overflow:hidden;border:3px solid var(--primary)}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-name{font-size:1.05rem;font-weight:700;color:var(--text-white);margin-bottom:4px}
.expert-role{font-size:0.82rem;color:var(--accent);margin-bottom:8px}
.expert-desc{font-size:0.82rem;color:var(--text-dim);margin-bottom:12px;line-height:1.6}
.expert-awards{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin-bottom:14px}
.award-badge{padding:3px 10px;border-radius:4px;font-size:0.7rem;background:rgba(245,158,11,0.15);color:var(--accent3)}
.expert-btns{display:flex;gap:8px;justify-content:center}

/* --- 社区卡片 --- */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{background:var(--bg-card);border-radius:var(--radius);padding:28px 24px;border:1px solid var(--border);transition:var(--transition);text-align:center}
.community-card:hover{border-color:var(--accent2);transform:translateY(-4px);box-shadow:0 6px 24px rgba(0,212,255,0.15)}
.community-icon{font-size:2.4rem;margin-bottom:12px}

/* --- AI赋能 --- */
.ai-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:var(--bg-card);border-radius:var(--radius);padding:28px 24px;border:1px solid var(--border);transition:var(--transition)}
.ai-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.ai-icon{font-size:2rem;margin-bottom:12px;display:inline-block;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* --- 合作Logo墙 --- */
.partners-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:32px;align-items:center}
.partner-logo{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 28px;font-size:0.95rem;font-weight:700;color:var(--text-dim);transition:var(--transition)}
.partner-logo:hover{border-color:var(--primary);color:var(--text-white)}

/* --- HowTo步骤 --- */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.howto-step{background:var(--bg-card);border-radius:var(--radius);padding:28px 20px;text-align:center;border:1px solid var(--border);position:relative;counter-increment:step;transition:var(--transition)}
.howto-step:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.howto-step::before{content:counter(step);display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:linear-gradient(135deg,var(--accent),var(--primary));color:#fff;border-radius:50%;font-size:1.1rem;font-weight:800;margin:0 auto 14px}
.howto-icon{font-size:1.8rem;margin-bottom:8px}

/* --- 用户评价 --- */
.reviews-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.review-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;border:1px solid var(--border)}
.review-stars{color:var(--accent3);font-size:0.9rem;margin-bottom:10px;letter-spacing:2px}
.review-text{font-size:0.9rem;color:var(--text);line-height:1.7;margin-bottom:14px;font-style:italic}
.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(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:0.9rem}
.review-name{font-size:0.85rem;font-weight:600;color:var(--text-white)}
.review-date{font-size:0.75rem;color:var(--text-dim)}

/* --- FAQ --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-question{padding:18px 24px;cursor:pointer;font-weight:600;color:var(--text-white);display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}
.faq-question:hover{color:var(--accent)}
.faq-question::after{content:'+';font-size:1.3rem;color:var(--accent);transition:var(--transition)}
.faq-item.active .faq-question::after{content:'-';transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:max-height 0.4s ease,padding 0.3s ease;color:var(--text-dim);font-size:0.9rem;line-height:1.7}
.faq-item.active .faq-answer{max-height:300px;padding:0 24px 18px}

/* --- 联系信息 --- */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.contact-info{background:var(--bg-card);border-radius:var(--radius);padding:32px;border:1px solid var(--border)}
.contact-item{display:flex;align-items:flex-start;gap:14px;margin-bottom:20px}
.contact-icon{font-size:1.3rem;color:var(--accent);min-width:24px;text-align:center;margin-top:2px}
.contact-text h4{font-size:0.95rem;color:var(--text-white);margin-bottom:4px}
.contact-text p{font-size:0.85rem;color:var(--text-dim)}

/* --- 分享栏 --- */
.share-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.share-label{font-size:0.85rem;color:var(--text-dim);font-weight:600}
.share-btn{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:50px;font-size:0.78rem;font-weight:600;border:1px solid var(--border);color:var(--text);transition:var(--transition);cursor:pointer;background:transparent}
.share-btn:hover{border-color:var(--accent);color:var(--accent)}
.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}

/* --- 二维码 --- */
.qr-row{display:flex;gap:32px;justify-content:center;flex-wrap:wrap}
.qr-item{text-align:center}
.qr-box{width:120px;height:120px;background:var(--bg-card);border:2px dashed var(--border);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;margin-bottom:8px;color:var(--text-dim);font-size:0.75rem}
.qr-label{font-size:0.8rem;color:var(--text-dim)}

/* --- 面包屑 --- */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:0.82rem;padding:12px 0;flex-wrap:wrap}
.breadcrumb a{color:rgba(255,255,255,0.7)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{color:rgba(255,255,255,0.4)}
.breadcrumb span{color:rgba(255,255,255,0.9)}

/* --- 内页Banner --- */
.page-banner{background:linear-gradient(135deg,var(--primary),#4c1d95);padding:48px 0 36px;position:relative}
.page-banner h1{font-size:2rem;margin-bottom:8px}
.page-banner h1 span{color:var(--accent)}
.page-banner .content-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:10px}
.page-banner .meta-item{font-size:0.8rem;color:rgba(255,255,255,0.7)}

/* --- 页脚 --- */
.site-footer{background:#080614;border-top:1px solid var(--border);padding:48px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer-brand p{font-size:0.85rem;color:var(--text-dim);line-height:1.7;margin-top:12px}
.footer-col h4{font-size:0.95rem;color:var(--text-white);margin-bottom:14px;font-weight:700}
.footer-col a{display:block;font-size:0.85rem;color:var(--text-dim);padding:4px 0;transition:var(--transition)}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid var(--border);padding:20px 0;text-align:center;font-size:0.8rem;color:var(--text-dim)}
.footer-bottom a{color:var(--accent2)}

/* --- EEAT资质 --- */
.cert-badges{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}
.cert-badge{display:flex;align-items:center;gap:6px;padding:6px 14px;background:rgba(124,58,237,0.1);border:1px solid var(--border);border-radius:50px;font-size:0.78rem;color:var(--text-dim)}
.cert-icon{font-size:1rem}
.editorial-box{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-top:24px}

/* --- 回到顶部 --- */
#back-to-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:linear-gradient(135deg,var(--accent),var(--primary));color:#fff;border:none;border-radius:50%;font-size:1.2rem;cursor:pointer;opacity:0;visibility:hidden;transition:var(--transition);z-index:999;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 16px rgba(255,107,43,0.3)}
#back-to-top.visible{opacity:1;visibility:visible}
#back-to-top:hover{transform:translateY(-3px);box-shadow:0 6px 24px rgba(255,107,43,0.5)}

/* --- 动画 --- */
.animate-fadeup{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease,transform 0.6s ease}
.animate-fadeup.loaded{opacity:1;transform:translateY(0)}

/* --- 响应式 --- */
@media(max-width:1024px){
  .video-grid,.ai-grid,.community-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:2rem}
}
@media(max-width:768px){
  .main-nav{position:fixed;top:0;right:-100%;width:75%;max-width:300px;height:100vh;background:var(--bg-dark);flex-direction:column;padding:80px 24px 24px;transition:right 0.35s ease;z-index:1001;border-left:1px solid var(--border)}
  .main-nav.open{right:0}
  .menu-toggle{display:block;z-index:1002}
  .video-grid,.ai-grid,.community-grid,.reviews-grid,.grid-2{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .stats-row{gap:24px}
  .stat-num{font-size:1.6rem}
  .hero{min-height:400px}
  .hero h1{font-size:1.6rem}
  .hero-desc{font-size:0.95rem}
  .section{padding:40px 0}
  .section-title{font-size:1.4rem}
  .grid-2{grid-template-columns:1fr}
}
@media(max-width:480px){
  .expert-grid{grid-template-columns:1fr}
  .quick-nav{gap:6px}
  .quick-nav a{font-size:0.75rem;padding:5px 12px}
  .hero h1{font-size:1.35rem}
  .btn{padding:10px 20px;font-size:0.85rem}
}