/* ============================================
   EyouCMS 教程网 - 纯静态模板样式
   ============================================ */
:root {
  --bg: #f7f8fc;
  --bg2: #ffffff;
  --ink: #1a1b2e;
  --muted: #6b7280;
  --rule: #e5e7eb;
  --accent: #4f46e5;
  --accent2: #06b6d4;
  --accent-light: rgba(79,70,229,0.06);
  --accent2-light: rgba(6,182,212,0.08);
  --code-bg: #1e1e2e;
  --code-ink: #cdd6f4;
  --green: #10b981;
  --amber: #f59e0b;
  --red: #ef4444;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --container: 1200px;
  --gap: 24px;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.8;font-size:16px}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent2)}
img{max-width:100%;height:auto}
ul,ol{list-style:none}
button{cursor:pointer;border:none;font-family:inherit}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}

/* Header */
.site-header{background:var(--bg2);border-bottom:1px solid var(--rule);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.header-inner{display:flex;align-items:center;gap:24px;padding:12px 20px;max-width:var(--container);margin:0 auto}
.logo{display:flex;align-items:center;gap:8px;flex-shrink:0}
.logo img{height:36px;width:auto}
.site-name{font-weight:700;font-size:1.15rem;color:var(--ink)}
.main-nav{flex:1}
.nav-list{display:flex;gap:4px}
.nav-item{position:relative}
.nav-link{display:block;padding:10px 16px;border-radius:var(--radius-sm);color:var(--ink);font-weight:500;font-size:.95rem}
.nav-link:hover,.nav-link.active{background:var(--accent-light);color:var(--accent)}
.sub-nav{display:none;position:absolute;top:100%;left:0;min-width:160px;background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);padding:6px 0;z-index:101}
.nav-item:hover .sub-nav{display:block}
.sub-nav li a{display:block;padding:8px 16px;color:var(--ink);font-size:.88rem}
.sub-nav li a:hover{background:var(--accent-light);color:var(--accent)}
.header-tools{display:flex;align-items:center;gap:12px;flex-shrink:0}
.search-box{display:flex;align-items:center;background:var(--bg);border:1px solid var(--rule);border-radius:24px;padding:2px 4px 2px 16px;transition:border-color .2s}
.search-box:focus-within{border-color:var(--accent)}
.search-input{border:none;background:none;outline:none;padding:8px 4px;font-size:.88rem;width:180px}
.search-btn{background:none;font-size:1rem;padding:6px 8px}
.menu-toggle{display:none;background:none;font-size:1.5rem;padding:4px 8px}

/* Breadcrumb */
.breadcrumb{background:var(--bg2);padding:10px 0;border-bottom:1px solid var(--rule)}
.breadcrumb-inner{max-width:var(--container);margin:0 auto;padding:0 20px;display:flex;flex-wrap:wrap;gap:4px;align-items:center;font-size:.85rem;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{color:var(--rule)}

/* Hero */
.hero{background:linear-gradient(135deg,#4f46e5 0%,#06b6d4 100%);color:#fff;padding:64px 0;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-40%;right:-10%;width:500px;height:500px;background:rgba(255,255,255,.05);border-radius:50%}
.hero h1{font-size:2.4rem;font-weight:800;margin-bottom:12px}
.hero p{font-size:1.1rem;opacity:.9;margin-bottom:28px}
.hero-search{display:flex;gap:8px;max-width:560px;margin:0 auto}
.hero-search-input{flex:1;padding:14px 20px;border:none;border-radius:28px;font-size:1rem;outline:none}
.hero-search-btn{padding:14px 28px;background:var(--ink);color:#fff;border-radius:28px;font-weight:600;font-size:.95rem;transition:background .2s}
.hero-search-btn:hover{background:rgba(0,0,0,.8);color:#fff}

/* Quick Cards */
.quick-cards{padding:40px 0 20px}
.card-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.quick-card{display:block;background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:28px 20px;text-align:center;transition:all .2s}
.quick-card:hover{border-color:var(--accent);box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.quick-icon{font-size:2.2rem;display:block;margin-bottom:10px}
.quick-card h3{font-size:1.1rem;margin-bottom:6px}
.quick-card p{font-size:.85rem;color:var(--muted)}

/* Section Head */
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.section-head.center{justify-content:center}
.section-head h2{font-size:1.4rem;font-weight:700;position:relative;padding-bottom:8px}
.section-head h2::after{content:'';position:absolute;left:0;bottom:0;width:40px;height:3px;background:var(--accent);border-radius:2px}
.section-head.center h2::after{left:50%;transform:translateX(-50%)}
.more-link{font-size:.85rem;color:var(--accent)}

/* Home Latest */
.home-latest{padding:20px 0}
.home-latest-grid{display:grid;grid-template-columns:1fr 300px;gap:var(--gap)}
.article-list{display:flex;flex-direction:column;gap:16px}
.article-item{display:flex;gap:16px;background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:16px;transition:box-shadow .2s}
.article-item:hover{box-shadow:var(--shadow)}
.article-thumb{width:160px;height:110px;flex-shrink:0;border-radius:var(--radius-sm);overflow:hidden;background:var(--bg);display:flex;align-items:center;justify-content:center}
.article-thumb img{width:100%;height:100%;object-fit:cover}
.thumb-placeholder{font-size:2rem;color:var(--rule)}
.thumb-placeholder.small{font-size:1.5rem}
.article-body{flex:1;min-width:0;display:flex;flex-direction:column}
.article-body h3{font-size:1.05rem;margin-bottom:6px;line-height:1.5}
.article-body h3 a{color:var(--ink)}
.article-body h3 a:hover{color:var(--accent)}
.article-summary{font-size:.85rem;color:var(--muted);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;flex:1}
.article-meta{display:flex;gap:16px;font-size:.8rem;color:var(--muted);margin-top:8px}

/* Hot List */
.hot-list{display:flex;flex-direction:column;gap:8px}
.hot-item{display:flex;align-items:flex-start;gap:8px}
.hot-rank{flex-shrink:0;width:22px;height:22px;border-radius:4px;background:var(--accent-light);color:var(--accent);font-size:.75rem;font-weight:700;display:flex;align-items:center;justify-content:center}
.hot-item:nth-child(1) .hot-rank{background:var(--accent);color:#fff}
.hot-item:nth-child(2) .hot-rank{background:var(--accent2);color:#fff}
.hot-item:nth-child(3) .hot-rank{background:var(--amber);color:#fff}
.hot-item a{font-size:.85rem;color:var(--ink);line-height:1.5}
.hot-item a:hover{color:var(--accent)}

/* Home Categories */
.home-categories{padding:20px 0}
.cat-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap)}
.cat-block{background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:20px}
.cat-article-list{display:flex;flex-direction:column;gap:10px}
.cat-article-list li{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 0;border-bottom:1px dashed var(--rule)}
.cat-article-list li:last-child{border-bottom:none}
.cat-article-list li a{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.9rem;color:var(--ink)}
.cat-article-list li a:hover{color:var(--accent)}
.cat-date{font-size:.78rem;color:var(--muted);flex-shrink:0}

/* Home Download */
.home-download{padding:20px 0 48px}
.card-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.download-card,.related-card{display:block;background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:24px;text-align:center;transition:all .2s}
.download-card:hover,.related-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow)}
.dl-icon{font-size:2rem;display:block;margin-bottom:8px}
.related-card img{width:100%;height:120px;object-fit:cover;border-radius:var(--radius-sm);margin-bottom:10px}
.related-card h4{font-size:.9rem;color:var(--ink)}
.related-card .thumb-placeholder{display:flex;align-items:center;justify-content:center;height:120px;background:var(--bg);border-radius:var(--radius-sm);margin-bottom:10px}

/* Page Banner */
.page-banner{padding:32px 0;text-align:center}
.page-banner h1{font-size:1.8rem;margin-bottom:6px}
.page-banner p{color:var(--muted);font-size:.95rem}

/* List Layout */
.list-section{padding:20px 0 48px}
.list-layout{display:grid;grid-template-columns:1fr 300px;gap:var(--gap)}
.list-main{min-width:0}

/* Pagination */
.pagination{display:flex;justify-content:center;align-items:center;gap:6px;margin-top:32px;flex-wrap:wrap}
.pagination a,.pagination span{display:inline-block;padding:8px 14px;border:1px solid var(--rule);border-radius:var(--radius-sm);font-size:.85rem;color:var(--ink);background:var(--bg2)}
.pagination a:hover{border-color:var(--accent);color:var(--accent)}
.pagination .current,.pagination .active{background:var(--accent);color:#fff;border-color:var(--accent)}
.pagination .disabled{color:var(--muted)}
.page-info{margin:0 8px;color:var(--muted);font-size:.85rem}

/* Sidebar */
.list-sidebar,.article-sidebar{display:flex;flex-direction:column;gap:var(--gap)}
.sidebar-block{background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:20px}
.sidebar-block h3{font-size:1rem;font-weight:700;margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid var(--accent)}
.subcat-list li,.sidebar-list li{padding:6px 0;border-bottom:1px dashed var(--rule)}
.subcat-list li:last-child,.sidebar-list li:last-child{border-bottom:none}
.subcat-list li a,.sidebar-list li a{font-size:.88rem;color:var(--ink)}
.subcat-list li a:hover,.sidebar-list li a:hover{color:var(--accent)}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-item{display:inline-block;padding:4px 12px;background:var(--accent-light);color:var(--accent);border-radius:16px;font-size:.82rem;transition:all .2s}
.tag-item:hover{background:var(--accent);color:#fff}

/* Article Detail */
.article-page{padding:20px 0 48px}
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:var(--gap)}
.article-main{min-width:0;background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:32px}
.article-header{margin-bottom:24px;padding-bottom:20px;border-bottom:1px solid var(--rule)}
.article-title{font-size:1.6rem;font-weight:800;line-height:1.4;margin-bottom:12px}
.article-info{display:flex;gap:20px;font-size:.82rem;color:var(--muted)}
.info-cat a{color:var(--accent)}

/* TOC */
.article-toc{background:var(--accent-light);border:1px solid rgba(79,70,229,.15);border-radius:var(--radius);padding:16px 20px;margin-bottom:24px}
.article-toc h3{font-size:.9rem;color:var(--accent);margin-bottom:8px}
.toc-list{display:flex;flex-direction:column;gap:4px}
.toc-list li a{display:block;padding:4px 8px;font-size:.85rem;color:var(--ink);border-left:2px solid var(--rule)}
.toc-list li a:hover,.toc-list li a.active{border-left-color:var(--accent);color:var(--accent)}
.toc-list li.h3 a{padding-left:24px}

/* Article Content */
.article-content{font-size:1rem;line-height:1.9}
.article-content h2{font-size:1.35rem;margin:28px 0 14px;font-weight:700;padding-bottom:8px;border-bottom:1px solid var(--rule)}
.article-content h3{font-size:1.15rem;margin:24px 0 12px;font-weight:700;color:var(--accent)}
.article-content h4{font-size:1rem;margin:18px 0 8px;font-weight:700}
.article-content p{margin-bottom:14px}
.article-content ul,.article-content ol{margin:12px 0 14px;padding-left:24px;list-style:disc}
.article-content ol{list-style:decimal}
.article-content li{margin-bottom:6px}
.article-content blockquote{border-left:4px solid var(--accent);background:var(--accent-light);padding:12px 20px;margin:16px 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--muted)}
.article-content img{max-width:100%;border-radius:var(--radius-sm);margin:12px 0}
.article-content table{width:100%;border-collapse:collapse;margin:16px 0}
.article-content th{background:var(--accent);color:#fff;padding:10px 14px;text-align:left;font-size:.9rem}
.article-content td{padding:10px 14px;border-bottom:1px solid var(--rule);font-size:.9rem}
.article-content tr:nth-child(even){background:var(--bg)}
.article-content pre{background:var(--code-bg);color:var(--code-ink);padding:20px;border-radius:var(--radius-sm);overflow-x:auto;font-family:"JetBrains Mono","Fira Code","Consolas",monospace;font-size:.85rem;line-height:1.6;margin:16px 0;position:relative}
.article-content pre code{background:none;padding:0;color:inherit;font-size:inherit}
.article-content code{background:rgba(79,70,229,.1);color:var(--accent);padding:2px 6px;border-radius:4px;font-family:"JetBrains Mono","Fira Code","Consolas",monospace;font-size:.85em}
.copy-btn{position:absolute;top:8px;right:8px;padding:4px 10px;background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.2);border-radius:4px;font-size:.75rem;cursor:pointer;opacity:0;transition:opacity .2s}
.article-content pre:hover .copy-btn{opacity:1}
.copy-btn:hover{background:rgba(255,255,255,.2)}
.copy-btn.copied{background:var(--green)}

/* Syntax colors */
.tk-keyword{color:#c678dd}
.tk-string{color:#98c379}
.tk-comment{color:#7f848e;font-style:italic}
.tk-tag{color:#e06c75}
.tk-number{color:#d19a66}

/* Tags + Share */
.article-tags{margin-top:24px;padding-top:16px;border-top:1px solid var(--rule)}
.tags-label{font-size:.85rem;color:var(--muted);margin-right:8px}
.article-share{display:flex;align-items:center;gap:8px;margin-top:16px;font-size:.85rem;color:var(--muted)}
.share-btn{padding:4px 14px;border:1px solid var(--rule);border-radius:20px;font-size:.82rem;color:var(--ink)}
.share-btn:hover{border-color:var(--accent);color:var(--accent)}

/* Prev/Next */
.prev-next{display:flex;gap:16px;margin-top:24px;padding-top:20px;border-top:1px solid var(--rule)}
.prev,.next{flex:1;font-size:.88rem}
.next{text-align:right}

/* Related */
.related-articles{margin-top:28px}
.related-articles h3{font-size:1.15rem;margin-bottom:14px}

/* Guestbook */
.guestbook-section{padding:20px 0 48px}
.guestbook-layout{display:grid;grid-template-columns:1fr;gap:var(--gap)}
.guestbook-form-block,.guestbook-list-block{background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:24px}
.guestbook-form-block h3,.guestbook-list-block h3{font-size:1.1rem;margin-bottom:16px;padding-bottom:10px;border-bottom:2px solid var(--accent)}
.form-group{margin-bottom:16px}
.form-group label{display:block;margin-bottom:6px;font-size:.88rem;font-weight:600}
.required{color:var(--red)}
.form-input,.form-select,.form-textarea{width:100%;padding:10px 14px;border:1px solid var(--rule);border-radius:var(--radius-sm);font-size:.9rem;outline:none;transition:border-color .2s;font-family:inherit}
.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--accent)}
.form-textarea{resize:vertical}
.code-row{display:flex;gap:8px}
.code-input{flex:1}
.verify-img{height:42px;cursor:pointer;border-radius:var(--radius-sm)}
.btn-submit{width:100%;padding:12px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-size:1rem;font-weight:600;transition:background .2s}
.btn-submit:hover{background:#4338ca}
.message-list{display:flex;flex-direction:column;gap:16px}
.message-item{border:1px solid var(--rule);border-radius:var(--radius-sm);padding:14px}
.msg-header{display:flex;justify-content:space-between;margin-bottom:8px}
.msg-name{font-weight:600;color:var(--accent);font-size:.9rem}
.msg-date{font-size:.8rem;color:var(--muted)}
.msg-content{font-size:.88rem;line-height:1.6}
.msg-reply{margin-top:10px;padding:10px;background:var(--accent2-light);border-radius:var(--radius-sm);font-size:.85rem}

/* Single */
.single-section{padding:20px 0 48px}
.single-layout{display:grid;grid-template-columns:1fr 300px;gap:var(--gap)}
.single-main{background:var(--bg2);border:1px solid var(--rule);border-radius:var(--radius);padding:32px}
.single-content{line-height:1.9}
.single-content p{margin-bottom:14px}

/* Search */
.search-result-info{font-size:.9rem;color:var(--muted);margin-bottom:16px}
.search-result-info strong{color:var(--accent)}
.search-empty{text-align:center;padding:48px 20px}
.search-empty p{font-size:1.1rem;color:var(--muted);margin-bottom:20px}
.search-box-large{display:flex;gap:8px;max-width:480px;margin:0 auto}
.search-input-large{flex:1;padding:12px 20px;border:1px solid var(--rule);border-radius:var(--radius-sm);font-size:1rem;outline:none}
.search-input-large:focus{border-color:var(--accent)}
.btn-primary{padding:12px 28px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-weight:600}
.btn-primary:hover{background:#4338ca;color:#fff}

/* Footer */
.site-footer{background:var(--ink);color:#9ca3af;padding:40px 0 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:12px}
.footer-desc{font-size:.82rem;line-height:1.6}
.footer-nav li,.friend-links li{margin-bottom:6px}
.footer-nav a,.friend-links a{font-size:.82rem;color:#9ca3af}
.footer-nav a:hover,.friend-links a:hover{color:var(--accent2)}
.footer-bottom{padding-top:20px;border-top:1px solid rgba(255,255,255,.08);text-align:center}
.footer-bottom p{font-size:.8rem;margin-bottom:4px}
.footer-bottom a{color:#9ca3af}
.footer-bottom a:hover{color:var(--accent2)}
.footer-bottom .sep{margin:0 8px;color:rgba(255,255,255,.2)}

/* Back to Top */
.back-to-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:var(--bg2);border:1px solid var(--rule);border-radius:50%;display:none;align-items:center;justify-content:center;font-size:1.3rem;color:var(--accent);cursor:pointer;box-shadow:var(--shadow-lg);z-index:90;transition:all .2s}
.back-to-top:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.back-to-top.visible{display:flex}
.reading-progress{position:fixed;top:0;left:0;height:3px;background:var(--accent);width:0;z-index:200;transition:width .1s}

/* Responsive */
@media (max-width:1024px){
  .card-grid-4{grid-template-columns:repeat(2,1fr)}
  .home-latest-grid,.list-layout,.article-layout,.single-layout{grid-template-columns:1fr}
  .list-sidebar,.article-sidebar{order:-1}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  .header-inner{flex-wrap:wrap;gap:12px}
  .main-nav{order:3;flex:1 0 100%;display:none}
  .main-nav.show{display:block}
  .nav-list{flex-direction:column;gap:0}
  .nav-item{width:100%}
  .nav-link{padding:12px 16px}
  .sub-nav{position:static;display:block;border:none;box-shadow:none;padding-left:20px}
  .menu-toggle{display:block}
  .search-input{width:120px}
  .hero{padding:40px 0}
  .hero h1{font-size:1.6rem}
  .hero p{font-size:.95rem}
  .hero-search{flex-direction:column}
  .card-grid-4,.card-grid-3{grid-template-columns:1fr}
  .cat-grid-2{grid-template-columns:1fr}
  .article-item{flex-direction:column;gap:12px}
  .article-thumb{width:100%;height:180px}
  .article-main,.single-main{padding:20px}
  .article-title{font-size:1.3rem}
  .article-info{flex-wrap:wrap;gap:8px}
  .prev-next{flex-direction:column;gap:8px}
  .next{text-align:left}
  .guestbook-layout{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:20px}
}
@media (max-width:480px){
  .container{padding:0 12px}
  .hero h1{font-size:1.3rem}
  .article-title{font-size:1.15rem}
  .section-head h2{font-size:1.15rem}
}