/* ========== 全局重置与基础样式 ========== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#e63946;
  --primary-dark:#b71c2a;
  --secondary:#1d3557;
  --accent:#f4a261;
  --bg-light:#faf9f6;
  --bg-dark:#0d1b2a;
  --text-dark:#1b1b1b;
  --text-light:#f0f0f0;
  --text-muted:#6b7280;
  --card-bg:#ffffff;
  --border:#e5e7eb;
  --shadow:0 4px 24px rgba(0,0,0,.08);
  --radius:12px;
  --font-main:'Noto Sans SC','PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
  --font-heading:'Noto Serif SC','Source Han Serif SC','SimSun',serif;
  --transition:all .3s ease;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-main);color:var(--text-dark);background:var(--bg-light);line-height:1.8;overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:700;line-height:1.3}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* 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}

/* ========== 导航栏 ========== */
.site-nav{background:var(--secondary);padding:0;position:relative;z-index:100}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{width:40px;height:40px;border-radius:8px}
.nav-logo span{color:#fff;font-size:1.25rem;font-weight:700;font-family:var(--font-heading)}
.nav-links{display:flex;gap:6px;list-style:none}
.nav-links a{color:rgba(255,255,255,.85);padding:8px 16px;border-radius:6px;font-size:.95rem;transition:var(--transition)}
.nav-links a:hover,.nav-links a.active{background:rgba(255,255,255,.12);color:#fff}
.nav-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer;padding:8px}

/* ========== 轮播图 ========== */
.hero-carousel{position:relative;overflow:hidden;background:var(--bg-dark);height:420px}
.carousel-track{display:flex;transition:transform .6s ease;height:100%}
.carousel-slide{min-width:100%;position:relative;display:flex;align-items:center;justify-content:center}
.carousel-slide .slide-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45)}
.carousel-slide .slide-content{position:relative;z-index:2;text-align:center;color:#fff;padding:20px;max-width:700px}
.carousel-slide .slide-content h2{font-size:2.2rem;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.carousel-slide .slide-content p{font-size:1.1rem;opacity:.9;margin-bottom:20px}
.carousel-btn{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.2);border:none;color:#fff;width:48px;height:48px;border-radius:50%;font-size:1.4rem;cursor:pointer;z-index:3;backdrop-filter:blur(4px);transition:var(--transition)}
.carousel-btn:hover{background:rgba(255,255,255,.35)}
.carousel-btn.prev{left:20px}
.carousel-btn.next{right:20px}
.carousel-dots{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.carousel-dots span{width:12px;height:12px;border-radius:50%;background:rgba(255,255,255,.4);cursor:pointer;transition:var(--transition)}
.carousel-dots span.active{background:#fff;transform:scale(1.2)}

/* ========== 通用区块 ========== */
.section{padding:60px 0}
.section-alt{background:#f0f4f8}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;color:var(--secondary);position:relative;display:inline-block;padding-bottom:12px}
.section-title h2::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:var(--primary);border-radius:2px}
.section-title p{color:var(--text-muted);margin-top:10px;font-size:1rem}

/* ========== 新闻聚合 ========== */
.news-tabs{display:flex;justify-content:center;gap:12px;margin-bottom:30px;flex-wrap:wrap}
.news-tab{padding:8px 22px;border:2px solid var(--border);border-radius:30px;cursor:pointer;font-size:.95rem;transition:var(--transition);background:#fff}
.news-tab:hover,.news-tab.active{border-color:var(--primary);color:var(--primary);background:rgba(230,57,70,.06)}
.news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:24px}
.news-card{background:var(--card-bg);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition)}
.news-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(0,0,0,.12)}
.news-card .card-img{height:200px;overflow:hidden}
.news-card .card-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.news-card:hover .card-img img{transform:scale(1.05)}
.news-card .card-body{padding:20px}
.news-card .card-tag{display:inline-block;background:rgba(230,57,70,.1);color:var(--primary);padding:3px 12px;border-radius:20px;font-size:.8rem;margin-bottom:8px}
.news-card h3{font-size:1.1rem;margin-bottom:8px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card .card-meta{color:var(--text-muted);font-size:.85rem;display:flex;gap:16px}

/* ========== 课程推荐 ========== */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:28px}
.course-card{background:var(--card-bg);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);position:relative}
.course-card:hover{transform:translateY(-4px);box-shadow:0 8px 32px rgba(0,0,0,.12)}
.course-card .card-img{height:180px;overflow:hidden;position:relative}
.course-card .card-img img{width:100%;height:100%;object-fit:cover}
.course-card .level-badge{position:absolute;top:12px;left:12px;padding:4px 14px;border-radius:20px;font-size:.8rem;font-weight:600;color:#fff}
.level-badge.basic{background:#2ecc71}
.level-badge.mid{background:#3498db}
.level-badge.advanced{background:#e74c3c}
.course-card .card-body{padding:20px}
.course-card h3{font-size:1.15rem;margin-bottom:8px}
.course-card .course-info{color:var(--text-muted);font-size:.9rem;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.course-card .course-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;font-size:.85rem;color:var(--text-muted)}
.btn{display:inline-block;padding:10px 24px;border-radius:8px;font-size:.95rem;font-weight:600;cursor:pointer;transition:var(--transition);border:none;text-align:center}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff}
.btn-outline{border:2px solid var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-block{display:block;width:100%}

/* ========== 案例分享 ========== */
.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:28px}
.case-card{background:var(--card-bg);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);padding:28px;transition:var(--transition)}
.case-card:hover{transform:translateY(-3px)}
.case-card .case-header{display:flex;align-items:center;gap:16px;margin-bottom:16px}
.case-card .avatar{width:56px;height:56px;border-radius:50%;object-fit:cover;border:3px solid var(--accent)}
.case-card .case-name{font-weight:700;font-size:1.05rem}
.case-card .case-role{color:var(--text-muted);font-size:.85rem}
.case-card .case-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0;text-align:center}
.case-card .stat-item{background:var(--bg-light);padding:12px 8px;border-radius:8px}
.case-card .stat-num{font-size:1.3rem;font-weight:700;color:var(--primary)}
.case-card .stat-label{font-size:.78rem;color:var(--text-muted)}
.case-card .case-text{color:#444;font-size:.95rem;line-height:1.7}

/* ========== 用户点评 ========== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:var(--card-bg);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.review-card .stars{color:var(--accent);font-size:1.1rem;margin-bottom:10px}
.review-card .review-text{color:#444;font-size:.95rem;line-height:1.7;margin-bottom:14px}
.review-card .reviewer{display:flex;align-items:center;gap:12px}
.review-card .reviewer img{width:40px;height:40px;border-radius:50%;object-fit:cover}
.review-card .reviewer-info .name{font-weight:600;font-size:.9rem}
.review-card .reviewer-info .date{color:var(--text-muted);font-size:.8rem}

/* ========== 常见问题 ========== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--card-bg);border-radius:var(--radius);margin-bottom:12px;box-shadow:0 2px 12px rgba(0,0,0,.05);overflow:hidden}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1rem;transition:var(--transition)}
.faq-question:hover{color:var(--primary)}
.faq-question .icon{font-size:1.2rem;transition:transform .3s ease}
.faq-item.open .faq-question .icon{transform:rotate(45deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:max-height .4s ease,padding .4s ease;color:#555;font-size:.95rem;line-height:1.7}
.faq-item.open .faq-answer{max-height:500px;padding:0 24px 18px}

/* ========== 面包屑 ========== */
.breadcrumb{padding:14px 0;font-size:.9rem;color:var(--text-muted)}
.breadcrumb a{color:var(--primary)}
.breadcrumb span{margin:0 8px;color:#ccc}

/* ========== 页脚 ========== */
.site-footer{background:var(--bg-dark);color:rgba(255,255,255,.8);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:32px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1.05rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--primary)}
.footer-col p{font-size:.9rem;line-height:1.7;color:rgba(255,255,255,.65)}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:8px}
.footer-col ul a{color:rgba(255,255,255,.65);font-size:.9rem;transition:var(--transition)}
.footer-col ul a:hover{color:var(--accent);padding-left:4px}
.footer-social{display:flex;gap:12px;margin-top:12px}
.footer-social a{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.1);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.95rem;transition:var(--transition)}
.footer-social a:hover{background:var(--primary);transform:translateY(-2px)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;text-align:center;font-size:.85rem;color:rgba(255,255,255,.45)}

/* ========== 内页样式 ========== */
.page-header{background:linear-gradient(135deg,var(--secondary),#2a4a7f);padding:60px 0 40px;color:#fff;text-align:center}
.page-header h1{font-size:2rem;margin-bottom:10px}
.page-header p{opacity:.8;font-size:1rem}

.article-content{max-width:800px;margin:0 auto;padding:40px 20px}
.article-content h1{font-size:1.8rem;margin-bottom:16px;color:var(--secondary)}
.article-content .article-meta{color:var(--text-muted);font-size:.9rem;margin-bottom:24px;display:flex;gap:20px;flex-wrap:wrap}
.article-content .article-body{font-size:1rem;line-height:2}
.article-content .article-body p{margin-bottom:16px}
.article-content .article-body h2{font-size:1.4rem;margin:28px 0 14px;color:var(--secondary)}
.article-content .article-body h3{font-size:1.2rem;margin:22px 0 10px}
.article-content .article-tags{margin-top:30px;display:flex;gap:8px;flex-wrap:wrap}
.article-content .article-tags a{background:var(--bg-light);padding:4px 14px;border-radius:20px;font-size:.85rem;color:var(--text-muted);border:1px solid var(--border)}
.article-content .article-tags a:hover{border-color:var(--primary);color:var(--primary)}

.related-articles{background:var(--bg-light);padding:40px 0}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}

.comment-section{max-width:800px;margin:0 auto;padding:40px 20px}
.comment-section h3{font-size:1.3rem;margin-bottom:20px}
.comment-form textarea{width:100%;min-height:120px;padding:14px;border:2px solid var(--border);border-radius:var(--radius);font-family:var(--font-main);font-size:.95rem;resize:vertical;transition:var(--transition)}
.comment-form textarea:focus{border-color:var(--primary);outline:none}
.comment-form .btn{margin-top:12px}
.comment-list{margin-top:30px}
.comment-item{display:flex;gap:14px;padding:20px 0;border-bottom:1px solid var(--border)}
.comment-item .comment-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;flex-shrink:0}
.comment-item .comment-body{flex:1}
.comment-item .comment-author{font-weight:600;font-size:.95rem}
.comment-item .comment-date{color:var(--text-muted);font-size:.8rem;margin-left:10px}
.comment-item .comment-text{margin-top:6px;font-size:.95rem;color:#444;line-height:1.7}

/* 课程详情 */
.course-detail-header{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;padding:40px 0}
.course-detail-info h1{font-size:1.8rem;margin-bottom:12px;color:var(--secondary)}
.course-detail-info .course-desc{font-size:1rem;color:#555;line-height:1.8;margin-bottom:20px}
.course-outline{background:var(--card-bg);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);margin:30px 0}
.course-outline h2{font-size:1.4rem;margin-bottom:20px;color:var(--secondary)}
.outline-item{padding:14px 0;border-bottom:1px solid var(--border);display:flex;gap:14px;align-items:flex-start}
.outline-item:last-child{border-bottom:none}
.outline-num{width:32px;height:32px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;flex-shrink:0}
.outline-text h4{font-size:1rem;margin-bottom:4px}
.outline-text p{font-size:.9rem;color:var(--text-muted)}

/* FAQ页面 */
.faq-category{margin-bottom:40px}
.faq-category h3{font-size:1.3rem;color:var(--secondary);margin-bottom:16px;padding-left:14px;border-left:4px solid var(--primary)}

/* ========== 动画 ========== */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ========== 响应式 ========== */
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:var(--secondary);flex-direction:column;padding:16px;gap:4px;box-shadow:0 8px 24px rgba(0,0,0,.2)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .hero-carousel{height:300px}
  .carousel-slide .slide-content h2{font-size:1.5rem}
  .news-grid,.course-grid,.case-grid,.review-grid,.related-grid{grid-template-columns:1fr}
  .course-detail-header{grid-template-columns:1fr}
  .section{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .news-tabs{gap:6px}
  .news-tab{padding:6px 14px;font-size:.85rem}
}