/* ===== 全局重置与基础样式 ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#0a2540;
  --primary-light:#1a3a5c;
  --accent:#00d4aa;
  --accent-hover:#00b894;
  --accent-glow:rgba(0,212,170,.15);
  --secondary:#ff6b35;
  --bg-dark:#0b1120;
  --bg-card:#111b2e;
  --bg-card-hover:#162240;
  --text-main:#e8ecf1;
  --text-muted:#8899aa;
  --text-heading:#ffffff;
  --border-color:#1e2d45;
  --gradient-hero:linear-gradient(135deg,#0a2540 0%,#0d1b2a 40%,#1b2838 100%);
  --gradient-accent:linear-gradient(135deg,#00d4aa,#00b4d8);
  --gradient-warm:linear-gradient(135deg,#ff6b35,#ff8c42);
  --shadow-card:0 8px 32px rgba(0,0,0,.3);
  --shadow-hover:0 12px 48px rgba(0,212,170,.15);
  --radius:12px;
  --radius-lg:20px;
  --font-main:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',sans-serif;
  --font-heading:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',sans-serif;
  --transition:all .3s cubic-bezier(.4,0,.2,1);
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--font-main);background:var(--bg-dark);color:var(--text-main);line-height:1.8;overflow-x:hidden}
a{color:var(--accent);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--accent-hover)}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-heading);line-height:1.3;font-weight:700}
h1{font-size:2.5rem}
h2{font-size:2rem}
h3{font-size:1.5rem}
h4{font-size:1.25rem}
p{margin-bottom:1rem}
ul,ol{list-style:none}

/* ===== 干扰标签隐藏 ===== */
.jammer-block{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;opacity:0;pointer-events:none;z-index:-9999}

/* ===== 容器 ===== */
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.container-narrow{max-width:960px;margin:0 auto;padding:0 24px}

/* ===== 导航栏 ===== */
.site-header{background:rgba(10,37,64,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);padding:0;z-index:1000;position:relative}
.nav-wrapper{display:flex;align-items:center;justify-content:space-between;height:72px}
.site-logo{display:flex;align-items:center;gap:10px;font-size:1.4rem;font-weight:800;color:var(--text-heading)}
.site-logo .logo-icon{width:40px;height:40px;background:var(--gradient-accent);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:#fff;font-weight:900}
.nav-menu{display:flex;gap:8px;align-items:center}
.nav-menu a{padding:8px 16px;border-radius:8px;color:var(--text-muted);font-size:.95rem;font-weight:500;transition:var(--transition)}
.nav-menu a:hover,.nav-menu a.active{color:var(--accent);background:var(--accent-glow)}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.mobile-toggle span{width:24px;height:2px;background:var(--text-main);border-radius:2px;transition:var(--transition)}

/* ===== 英雄横幅 ===== */
.hero-section{position:relative;min-height:560px;display:flex;align-items:center;overflow:hidden;background:var(--gradient-hero)}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.25;filter:blur(2px)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,37,64,.7) 0%,rgba(11,17,32,.9) 100%);z-index:1}
.hero-content{position:relative;z-index:2;max-width:720px;padding:80px 0}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:var(--accent-glow);border:1px solid rgba(0,212,170,.3);padding:6px 16px;border-radius:50px;font-size:.85rem;color:var(--accent);margin-bottom:20px}
.hero-badge::before{content:'';width:8px;height:8px;background:var(--accent);border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero-title{font-size:3rem;margin-bottom:16px;line-height:1.2}
.hero-title .highlight{background:var(--gradient-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{font-size:1.15rem;color:var(--text-muted);margin-bottom:32px;line-height:1.8}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;border:none;transition:var(--transition)}
.btn-primary{background:var(--gradient-accent);color:#0a2540}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,212,170,.3);color:#0a2540}
.btn-outline{background:transparent;border:2px solid var(--border-color);color:var(--text-main)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-secondary{background:var(--gradient-warm);color:#fff}
.btn-secondary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,107,53,.3);color:#fff}

/* ===== 板块通用 ===== */
.section{padding:80px 0}
.section-header{text-align:center;margin-bottom:56px}
.section-header .section-tag{display:inline-block;background:var(--accent-glow);color:var(--accent);padding:4px 16px;border-radius:50px;font-size:.85rem;font-weight:600;margin-bottom:12px;border:1px solid rgba(0,212,170,.2)}
.section-header h2{margin-bottom:12px}
.section-header p{color:var(--text-muted);max-width:640px;margin:0 auto;font-size:1.05rem}

/* ===== 设备评测卡片网格 ===== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:28px}
.review-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;transition:var(--transition)}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(0,212,170,.3)}
.review-card-img{position:relative;height:200px;overflow:hidden}
.review-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.review-card:hover .review-card-img img{transform:scale(1.05)}
.review-card-badge{position:absolute;top:12px;left:12px;background:var(--gradient-accent);color:#0a2540;padding:4px 12px;border-radius:6px;font-size:.8rem;font-weight:700}
.review-card-body{padding:24px}
.review-card-body h3{font-size:1.2rem;margin-bottom:8px}
.review-card-body p{color:var(--text-muted);font-size:.95rem;margin-bottom:16px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.review-card-meta{display:flex;justify-content:space-between;align-items:center;padding-top:16px;border-top:1px solid var(--border-color)}
.review-card-meta .rating{color:var(--secondary);font-weight:700}
.review-card-meta .date{color:var(--text-muted);font-size:.85rem}

/* ===== 课程卡片 ===== */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:28px}
.course-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;transition:var(--transition)}
.course-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(0,212,170,.3)}
.course-card-img{height:180px;overflow:hidden;position:relative}
.course-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.course-card:hover .course-card-img img{transform:scale(1.05)}
.course-card-level{position:absolute;top:12px;right:12px;padding:4px 12px;border-radius:6px;font-size:.8rem;font-weight:700}
.level-beginner{background:#22c55e;color:#fff}
.level-advanced{background:#f59e0b;color:#fff}
.level-pro{background:#ef4444;color:#fff}
.course-card-body{padding:24px}
.course-card-body h3{font-size:1.15rem;margin-bottom:8px}
.course-card-body p{color:var(--text-muted);font-size:.93rem;margin-bottom:16px}
.course-card-footer{display:flex;justify-content:space-between;align-items:center;padding-top:16px;border-top:1px solid var(--border-color)}
.course-card-footer .lessons{color:var(--text-muted);font-size:.85rem}
.course-card-footer .enroll-btn{background:var(--accent-glow);color:var(--accent);padding:6px 16px;border-radius:8px;font-size:.85rem;font-weight:600;border:1px solid rgba(0,212,170,.3);transition:var(--transition)}
.course-card-footer .enroll-btn:hover{background:var(--accent);color:#0a2540}

/* ===== 用户评价 ===== */
.testimonial-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:28px}
.testimonial-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:28px;transition:var(--transition)}
.testimonial-card:hover{border-color:rgba(0,212,170,.3);box-shadow:var(--shadow-hover)}
.testimonial-stars{color:var(--secondary);font-size:1.1rem;margin-bottom:12px;letter-spacing:2px}
.testimonial-text{color:var(--text-main);font-size:.98rem;line-height:1.8;margin-bottom:20px;font-style:italic}
.testimonial-author{display:flex;align-items:center;gap:12px}
.testimonial-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;border:2px solid var(--accent)}
.testimonial-info .name{font-weight:600;color:var(--text-heading);font-size:.95rem}
.testimonial-info .role{color:var(--text-muted);font-size:.85rem}

/* ===== 设备对比表 ===== */
.compare-table{width:100%;border-collapse:collapse;background:var(--bg-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border-color)}
.compare-table th{background:var(--primary-light);color:var(--text-heading);padding:16px 20px;text-align:left;font-weight:600;font-size:.95rem}
.compare-table td{padding:14px 20px;border-bottom:1px solid var(--border-color);color:var(--text-main);font-size:.93rem}
.compare-table tr:last-child td{border-bottom:none}
.compare-table tr:hover td{background:var(--bg-card-hover)}

/* ===== 常见问题 ===== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);margin-bottom:12px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:rgba(0,212,170,.3)}
.faq-question{padding:20px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:var(--text-heading);font-size:1.05rem;transition:var(--transition)}
.faq-question:hover{color:var(--accent)}
.faq-question .icon{font-size:1.2rem;transition:transform .3s ease;color:var(--accent)}
.faq-item.active .faq-question .icon{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease}
.faq-item.active .faq-answer{max-height:500px;padding:0 24px 20px}
.faq-answer p{color:var(--text-muted);line-height:1.8}

/* ===== 组合搭配方案 ===== */
.combo-section{background:linear-gradient(135deg,var(--primary) 0%,var(--bg-card) 100%);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:48px;margin-top:60px}
.combo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;margin-top:32px}
.combo-card{background:rgba(255,255,255,.03);border:1px solid var(--border-color);border-radius:var(--radius);padding:28px;text-align:center;transition:var(--transition)}
.combo-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.combo-card .combo-icon{font-size:2.5rem;margin-bottom:16px}
.combo-card h4{margin-bottom:8px}
.combo-card p{color:var(--text-muted);font-size:.93rem;margin-bottom:20px}
.combo-card .price{font-size:1.5rem;font-weight:800;color:var(--accent);margin-bottom:16px}

/* ===== 面包屑导航 ===== */
.breadcrumb{padding:16px 0;font-size:.9rem}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{color:var(--text-muted);margin:0 8px}
.breadcrumb .current{color:var(--accent)}

/* ===== 内页横幅 ===== */
.page-banner{position:relative;height:320px;display:flex;align-items:center;overflow:hidden}
.page-banner .banner-bg{position:absolute;inset:0}
.page-banner .banner-bg img{width:100%;height:100%;object-fit:cover;opacity:.3}
.page-banner .banner-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,37,64,.6),rgba(11,17,32,.95))}
.page-banner .banner-content{position:relative;z-index:2}
.page-banner h1{font-size:2.5rem;margin-bottom:12px}
.page-banner p{color:var(--text-muted);font-size:1.1rem;max-width:600px}

/* ===== 评测详情 ===== */
.review-detail{display:grid;grid-template-columns:2fr 1fr;gap:40px;padding:60px 0}
.review-main{}
.review-sidebar{}
.spec-table{width:100%;margin:24px 0}
.spec-table th,.spec-table td{padding:12px 16px;border-bottom:1px solid var(--border-color);text-align:left}
.spec-table th{color:var(--text-muted);font-weight:500;width:35%}
.spec-table td{color:var(--text-heading);font-weight:600}
.pros-cons{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:24px 0}
.pros,.cons{background:var(--bg-card);border-radius:var(--radius);padding:24px;border:1px solid var(--border-color)}
.pros h4{color:#22c55e;margin-bottom:12px}
.cons h4{color:#ef4444;margin-bottom:12px}
.pros li,.cons li{padding:6px 0;padding-left:20px;position:relative;color:var(--text-muted);font-size:.95rem}
.pros li::before{content:'✓';position:absolute;left:0;color:#22c55e;font-weight:700}
.cons li::before{content:'✗';position:absolute;left:0;color:#ef4444;font-weight:700}
.sidebar-widget{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);padding:24px;margin-bottom:24px}
.sidebar-widget h4{margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border-color)}

/* ===== 课程详情 ===== */
.course-detail{padding:60px 0}
.course-outline{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-lg);overflow:hidden;margin:32px 0}
.outline-chapter{border-bottom:1px solid var(--border-color)}
.outline-chapter:last-child{border-bottom:none}
.outline-chapter-title{padding:20px 24px;font-weight:600;color:var(--text-heading);cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:var(--transition)}
.outline-chapter-title:hover{background:var(--bg-card-hover)}
.outline-lessons{padding:0 24px 16px}
.outline-lesson{padding:10px 16px;color:var(--text-muted);font-size:.93rem;border-radius:8px;margin-bottom:4px;display:flex;align-items:center;gap:10px}
.outline-lesson:hover{background:var(--accent-glow);color:var(--accent)}
.outline-lesson .lesson-icon{width:24px;height:24px;border-radius:50%;background:var(--accent-glow);display:flex;align-items:center;justify-content:center;font-size:.7rem;color:var(--accent);flex-shrink:0}

/* ===== 视频播放器占位 ===== */
.video-player{position:relative;padding-bottom:56.25%;height:0;background:var(--bg-card);border-radius:var(--radius);overflow:hidden;margin:24px 0;border:1px solid var(--border-color)}
.video-player .play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.4)}
.video-player .play-btn{width:72px;height:72px;background:var(--gradient-accent);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#0a2540;cursor:pointer;transition:var(--transition)}
.video-player .play-btn:hover{transform:scale(1.1);box-shadow:0 0 32px rgba(0,212,170,.4)}
.video-player img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}

/* ===== 评论区 ===== */
.comments-section{margin-top:48px}
.comment-item{display:flex;gap:16px;padding:24px 0;border-bottom:1px solid var(--border-color)}
.comment-avatar{width:48px;height:48px;border-radius:50%;object-fit:cover;flex-shrink:0}
.comment-body{}
.comment-header{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.comment-header .author{font-weight:600;color:var(--text-heading)}
.comment-header .time{color:var(--text-muted);font-size:.85rem}
.comment-text{color:var(--text-muted);line-height:1.8}

/* ===== 页脚 ===== */
.site-footer{background:var(--primary);border-top:1px solid var(--border-color);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand .footer-logo{font-size:1.3rem;font-weight:800;color:var(--text-heading);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.footer-brand p{color:var(--text-muted);font-size:.93rem;line-height:1.7}
.footer-links h4{color:var(--text-heading);margin-bottom:16px;font-size:1rem}
.footer-links a{display:block;color:var(--text-muted);padding:4px 0;font-size:.93rem;transition:var(--transition)}
.footer-links a:hover{color:var(--accent);padding-left:4px}
.footer-social{display:flex;gap:12px;margin-top:16px}
.footer-social a{width:40px;height:40px;border-radius:10px;background:var(--bg-card);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:var(--transition)}
.footer-social a:hover{background:var(--accent);color:#0a2540;border-color:var(--accent)}
.footer-bottom{border-top:1px solid var(--border-color);padding:20px 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.footer-bottom p{color:var(--text-muted);font-size:.85rem}
.footer-bottom-links{display:flex;gap:20px}
.footer-bottom-links a{color:var(--text-muted);font-size:.85rem}
.footer-bottom-links a:hover{color:var(--accent)}

/* ===== 动画 ===== */
.fade-in{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}
.slide-in-left{opacity:0;transform:translateX(-40px);transition:opacity .6s ease,transform .6s ease}
.slide-in-left.visible{opacity:1;transform:translateX(0)}
.slide-in-right{opacity:0;transform:translateX(40px);transition:opacity .6s ease,transform .6s ease}
.slide-in-right.visible{opacity:1;transform:translateX(0)}

/* ===== 统计数字 ===== */
.stats-bar{background:var(--bg-card);border-top:1px solid var(--border-color);border-bottom:1px solid var(--border-color);padding:40px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-item .stat-number{font-size:2.5rem;font-weight:800;background:var(--gradient-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.stat-item .stat-label{color:var(--text-muted);font-size:.93rem;margin-top:4px}

/* ===== 新闻动态 ===== */
.news-ticker{background:var(--accent-glow);border:1px solid rgba(0,212,170,.2);border-radius:var(--radius);padding:12px 20px;margin-bottom:40px;display:flex;align-items:center;gap:12px;overflow:hidden}
.news-ticker .ticker-label{background:var(--gradient-accent);color:#0a2540;padding:4px 12px;border-radius:6px;font-size:.85rem;font-weight:700;white-space:nowrap}
.news-ticker .ticker-content{overflow:hidden;flex:1}
.news-ticker .ticker-text{white-space:nowrap;animation:ticker 30s linear infinite;color:var(--text-main);font-size:.93rem}
@keyframes ticker{0%{transform:translateX(100%)}100%{transform:translateX(-100%)}}

/* ===== 响应式设计 ===== */
@media(max-width:1024px){
  .review-detail{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  html{font-size:15px}
  .nav-menu{display:none;position:absolute;top:72px;left:0;right:0;background:var(--primary);border-bottom:1px solid var(--border-color);flex-direction:column;padding:16px;gap:4px}
  .nav-menu.open{display:flex}
  .mobile-toggle{display:flex}
  .hero-title{font-size:2rem}
  .hero-content{padding:60px 0}
  .hero-section{min-height:auto}
  .hero-actions{flex-direction:column}
  .section{padding:48px 0}
  .review-grid{grid-template-columns:1fr}
  .course-grid{grid-template-columns:1fr}
  .testimonial-grid{grid-template-columns:1fr}
  .combo-grid{grid-template-columns:1fr}
  .pros-cons{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .page-banner{height:240px}
  .page-banner h1{font-size:1.8rem}
  .combo-section{padding:28px}
  .compare-table{font-size:.85rem}
  .compare-table th,.compare-table td{padding:10px 12px}
}
@media(max-width:480px){
  .container{padding:0 16px}
  h1{font-size:1.8rem}
  h2{font-size:1.5rem}
  .hero-title{font-size:1.6rem}
  .stats-grid{grid-template-columns:1fr 1fr}
}

/* ===== 懒加载 ===== */
img[loading="lazy"]{opacity:0;transition:opacity .5s ease}
img[loading="lazy"].loaded,img[loading="lazy"][src]{opacity:1}

/* ===== 隐私政策页面 ===== */
.legal-content{padding:60px 0}
.legal-content h2{margin:32px 0 16px;font-size:1.5rem}
.legal-content h3{margin:24px 0 12px;font-size:1.2rem}
.legal-content p,.legal-content li{color:var(--text-muted);line-height:1.8}
.legal-content ul{padding-left:20px;margin:12px 0}
.legal-content ul li{list-style:disc;margin-bottom:8px}