/* ============================================================
   AI导航 · 全局样式 v2.0（日间默认 + 夜间可切换）
   设计：浅色科技风 · 移动优先响应式 · 零依赖
   ============================================================ */
:root{
  --bg:#f5f7fb;
  --bg-alt:#eef1f7;
  --card:#ffffff;
  --card-hover:#f7f9ff;
  --border:rgba(15,23,42,.09);
  --text:#1a2333;
  --text-2:#5a6b85;
  --text-3:#8a97ad;
  --primary:#2563eb;
  --primary-2:#7c3aed;
  --grad:linear-gradient(135deg,#2563eb,#7c3aed);
  --oss:#059669;
  --free:#d97706;
  --radius:14px;
  --shadow:0 8px 30px rgba(30,50,100,.10);
  --shadow-lg:0 12px 40px rgba(30,50,100,.16);
  --hero-glow:radial-gradient(1200px 500px at 20% -10%,rgba(37,99,235,.14),transparent 60%),radial-gradient(900px 400px at 90% 0%,rgba(124,58,237,.12),transparent 55%);
  --header-bg:rgba(245,247,251,.88);
}
body.dark{
  --bg:#0b0f1a;
  --bg-alt:#101627;
  --card:#161e33;
  --card-hover:#1b2440;
  --border:rgba(255,255,255,.08);
  --text:#e8ecf5;
  --text-2:#9aa5bd;
  --text-3:#6b7690;
  --primary:#4f8cff;
  --primary-2:#8b5cf6;
  --oss:#34d399;
  --free:#fbbf24;
  --shadow:0 8px 30px rgba(0,0,0,.35);
  --shadow-lg:0 12px 40px rgba(0,0,0,.5);
  --hero-glow:radial-gradient(1200px 500px at 20% -10%,rgba(79,140,255,.25),transparent 60%),radial-gradient(900px 400px at 90% 0%,rgba(139,92,246,.22),transparent 55%);
  --header-bg:rgba(11,15,26,.85);
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;font-size:15px;transition:background .3s,color .3s}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-2)}
ul,ol{list-style:none}
.container{max-width:1700px;margin:0 auto;padding:0 16px}
.mb-40{margin-bottom:40px}

/* ============ 头部导航 ============ */
.site-header{position:sticky;top:0;z-index:100;background:var(--header-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{display:grid;grid-template-columns:auto 1fr auto;align-items:center;height:60px;gap:12px;position:relative}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;min-width:0}
.logo-icon{width:34px;height:34px;border-radius:9px;background:var(--grad);color:#fff;font-weight:800;font-size:15px;display:flex;align-items:center;justify-content:center;letter-spacing:.5px}
.logo-text{font-size:19px;font-weight:800;letter-spacing:.5px;color:var(--text);display:flex;align-items:baseline;gap:8px;white-space:nowrap}
.logo-text em{font-style:normal;font-size:11px;font-weight:400;color:var(--text-3);letter-spacing:1px}
.site-nav{display:flex;align-items:center;justify-content:center;gap:2px;min-width:0;flex-wrap:nowrap}
.site-nav a{padding:6px 10px;border-radius:8px;color:var(--text-2);font-size:13.5px;white-space:nowrap}
.site-nav a:hover{color:var(--text);background:rgba(37,99,235,.08)}
.site-nav a.active{color:#fff;background:var(--grad)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.theme-toggle{width:38px;height:38px;border-radius:50%;border:1px solid var(--border);background:var(--card);color:var(--text-2);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:.2s}
.theme-toggle:hover{color:var(--primary);border-color:var(--primary)}
body.dark .theme-toggle .theme-icon{display:none}
body.dark .theme-toggle::before{content:"🌙"}
@media(max-width:920px){
  .nav-toggle{display:flex}
  .site-nav{position:fixed;top:60px;left:0;right:0;bottom:auto;transform:translateY(-130%);background:var(--bg-alt);flex-direction:column;align-items:flex-start;padding:12px 16px 18px;gap:2px;border-bottom:1px solid var(--border);transition:transform .3s ease;overflow-y:auto;max-height:calc(100vh - 60px)}
  .site-nav.open{transform:translateY(0)}
  .site-nav a{display:block;width:100%;padding:10px 12px}
}

/* ============ Hero ============ */
.hero{background:var(--hero-glow),var(--bg);padding:84px 0 70px;text-align:center;border-bottom:1px solid var(--border)}
.hero-title{font-size:clamp(28px,5vw,46px);font-weight:800;letter-spacing:1px;line-height:1.3}
.hero-title span{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{margin:14px auto 34px;color:var(--text-2);font-size:clamp(13px,2vw,16px);max-width:640px}
.hero-search{display:flex;max-width:560px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:50px;overflow:hidden;box-shadow:var(--shadow);transition:border-color .2s}
.hero-search:focus-within{border-color:var(--primary)}
.hero-search input{flex:1;background:none;border:0;outline:0;color:var(--text);padding:14px 22px;font-size:15px;min-width:0}
.hero-search input::placeholder{color:var(--text-3)}
.hero-search button{background:var(--grad);color:#fff;border:0;padding:0 30px;font-size:15px;font-weight:600;cursor:pointer;transition:opacity .2s}
.hero-search button:hover{opacity:.88}
.hero-hot{margin-top:20px;font-size:13px;color:var(--text-3)}
.hero-hot a{color:var(--text-2);margin:0 6px;padding:4px 10px;border:1px solid var(--border);border-radius:20px;display:inline-block;margin-top:6px}
.hero-hot a:hover{color:var(--primary);border-color:var(--primary)}

/* ============ 区块 ============ */
.section{padding:52px 0}
.section-alt{background:var(--bg-alt)}
.section-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:26px}
.section-title{font-size:22px;font-weight:800;position:relative;padding-left:14px}
.section-title::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:20px;border-radius:2px;background:var(--grad)}
.section-more{font-size:13px;color:var(--text-2)}
.section-more:hover{color:var(--primary)}

/* 分类卡片 */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.cat-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 16px;text-align:center;transition:transform .2s,border-color .2s,box-shadow .2s}
.cat-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow)}
.cat-name{display:block;font-size:16px;font-weight:700;color:var(--text)}
.cat-card:hover .cat-name{color:var(--primary)}
.cat-more{display:block;margin-top:8px;font-size:12px;color:var(--text-3)}

/* ============ 项目卡片 ============ */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.proj-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;transition:transform .2s,border-color .2s,box-shadow .2s}
.proj-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow)}
.proj-top{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.proj-logo{width:46px;height:46px;border-radius:12px;overflow:hidden;background:var(--bg-alt);border:1px solid var(--border);flex-shrink:0;display:flex;align-items:center;justify-content:center}
.proj-logo img{width:100%;height:100%;object-fit:cover}
.proj-title{font-size:16px;font-weight:700;color:var(--text);flex:1;line-height:1.35;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.proj-card:hover .proj-title{color:var(--primary)}
.proj-badges{display:flex;flex-direction:column;gap:4px;flex-shrink:0}
.proj-desc{font-size:13px;color:var(--text-2);margin-bottom:14px;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;min-height:38px}
.proj-meta{display:flex;align-items:center;gap:12px;margin-top:auto;font-size:12px;color:var(--text-3)}
.meta-star{color:var(--free);font-weight:600}
.meta-date{margin-left:auto}

/* 徽章 */
.badge{display:inline-block;padding:2px 8px;border-radius:6px;font-size:11px;font-style:normal;font-weight:600;line-height:1.5;background:rgba(37,99,235,.08);color:var(--text-2);white-space:nowrap}
.badge-oss{background:rgba(5,150,105,.12);color:var(--oss)}
.badge-free{background:rgba(217,119,6,.12);color:var(--free)}
.badge-sub{background:rgba(37,99,235,.12);color:var(--primary)}
body.dark .badge{background:rgba(255,255,255,.09)}
body.dark .badge-oss{background:rgba(52,211,153,.14)}
body.dark .badge-free{background:rgba(251,191,36,.14)}
body.dark .badge-sub{background:rgba(79,140,255,.16)}

/* ============ 面包屑 ============ */
.breadcrumb-wrap{background:var(--bg-alt);border-bottom:1px solid var(--border);padding:10px 0;font-size:13px;color:var(--text-3)}
.breadcrumb-wrap a{color:var(--text-2)}
.breadcrumb-wrap .sep{margin:0 8px;color:var(--text-3)}
.breadcrumb-wrap .current{color:var(--text)}

/* ============ 栏目头 ============ */
.sort-head{background:radial-gradient(800px 300px at 50% -20%,rgba(37,99,235,.10),transparent 60%),var(--bg-alt);padding:44px 0 38px;border-bottom:1px solid var(--border);text-align:center}
.sort-name{font-size:clamp(22px,4vw,32px);font-weight:800}
.sort-sub{margin-top:8px;color:var(--primary);font-size:14px}
.sort-desc{margin:10px auto 0;color:var(--text-2);font-size:13px;max-width:640px}
.sort-sub:empty,.sort-desc:empty{display:none}
body.dark .sort-head{background:radial-gradient(800px 300px at 50% -20%,rgba(79,140,255,.18),transparent 60%),var(--bg-alt)}

/* ============ 筛选 ============ */
.filter-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;margin-bottom:28px}
.filter-row{display:flex;align-items:flex-start;gap:14px;padding:8px 0;flex-wrap:wrap}
.filter-row+.filter-row{border-top:1px dashed var(--border)}
.filter-label{flex-shrink:0;font-size:13px;color:var(--text-3);padding-top:5px;width:38px}
.filter-options{display:flex;flex-wrap:wrap;gap:8px;flex:1}
.filter-btn{padding:5px 14px;border-radius:20px;font-size:13px;color:var(--text-2);border:1px solid var(--border);background:none;transition:.2s}
.filter-btn:hover{color:var(--primary);border-color:var(--primary)}
.filter-btn.on{background:var(--grad);color:#fff;border-color:transparent}

/* ============ 详情页 ============ */
.detail-head{background:radial-gradient(900px 350px at 30% -20%,rgba(37,99,235,.10),transparent 55%),var(--bg-alt);padding:44px 0;border-bottom:1px solid var(--border)}
body.dark .detail-head{background:radial-gradient(900px 350px at 30% -20%,rgba(79,140,255,.16),transparent 55%),var(--bg-alt)}
.detail-top{display:flex;gap:28px;align-items:flex-start}
.detail-logo{width:96px;height:96px;border-radius:20px;overflow:hidden;border:1px solid var(--border);background:var(--card);flex-shrink:0;display:flex;align-items:center;justify-content:center}
.detail-logo img{width:100%;height:100%;object-fit:cover}
.detail-title{font-size:clamp(22px,3.5vw,30px);font-weight:800;line-height:1.3}
.detail-desc{margin:10px 0 14px;color:var(--text-2);font-size:14px;max-width:760px}
.detail-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.detail-actions{display:flex;flex-wrap:wrap;gap:10px}
.btn{display:inline-flex;align-items:center;padding:10px 24px;border-radius:10px;font-size:14px;font-weight:600;transition:.2s;border:1px solid transparent}
.btn-primary{background:var(--grad);color:#fff}
.btn-primary:hover{opacity:.88;color:#fff}
.btn-ghost{border-color:var(--border);color:var(--text-2);background:var(--card)}
.btn-ghost:hover{color:var(--primary);border-color:var(--primary)}
.detail-body{max-width:960px}
.data-panel,.block{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:24px}
.panel-title{font-size:17px;font-weight:800;margin-bottom:18px;position:relative;padding-left:12px}
.panel-title::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:16px;border-radius:2px;background:var(--grad)}
.data-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:0}
.data-item{display:flex;padding:11px 4px;border-bottom:1px dashed var(--border);font-size:13.5px}
.data-label{color:var(--text-3);width:110px;flex-shrink:0}
.data-value{color:var(--text);word-break:break-all}
.data-value.star{color:var(--free)}
.data-value a{color:var(--primary)}
.pros-list li,.cons-list li,.scene-list li{position:relative;padding-left:20px;margin-bottom:8px;color:var(--text-2);font-size:14px;line-height:1.8}
.pros-list li::before{content:"✓";position:absolute;left:0;color:var(--oss);font-weight:700}
.cons-list li::before{content:"✕";position:absolute;left:0;color:#f87171;font-weight:700}
.scene-list li::before{content:"▸";position:absolute;left:0;color:var(--primary)}
.alt-text{color:var(--text-2);font-size:14px;line-height:2;white-space:pre-line}
.content-body{color:var(--text-2);font-size:14.5px;line-height:1.9}
.content-body img{border-radius:10px;margin:10px 0}
.content-body h3,.content-body h4{margin:16px 0 8px;color:var(--text)}
.prevnext{font-size:13px;color:var(--text-3);margin-top:8px}
.prevnext p{padding:5px 0}
.prevnext a{color:var(--text-2)}
.prevnext a:hover{color:var(--primary)}

/* ============ 分页 ============ */
.pagination-wrap{display:flex;justify-content:center;align-items:center;gap:8px;margin:36px 0 10px;flex-wrap:wrap}
.page-btn,.pagination-wrap a,.pagination-wrap span{min-width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;padding:0 12px;border-radius:8px;font-size:13px;border:1px solid var(--border);color:var(--text-2);background:var(--card)}
.pagination-wrap a:hover{color:var(--primary);border-color:var(--primary)}
.pagination-wrap .current{background:var(--grad);color:#fff;border-color:transparent}
.empty-tip{text-align:center;padding:60px 0;color:var(--text-3)}

/* ============ 页脚 ============ */
.site-footer{margin-top:40px;background:var(--bg-alt);border-top:1px solid var(--border)}
.footer-inner{display:flex;gap:40px;padding:44px 16px 30px;flex-wrap:wrap}
.footer-brand{flex:1;min-width:260px}
.footer-title{font-size:17px;font-weight:800}
.footer-title span{color:var(--text-3);font-weight:400;font-size:13px}
.footer-desc{margin-top:10px;color:var(--text-3);font-size:13px;max-width:420px;line-height:1.8}
.footer-links{display:flex;gap:50px;flex-wrap:wrap}
.footer-col{display:flex;flex-direction:column;gap:8px}
.footer-h{font-size:14px;font-weight:700;color:var(--text);margin-bottom:6px}
.footer-col a{font-size:13px;color:var(--text-3)}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);padding:16px 0}
.footer-bottom p{font-size:12px;color:var(--text-3);text-align:center}
.footer-bottom a{color:var(--text-2)}

/* ============ 响应式细节 ============ */
@media(max-width:768px){
  .section{padding:38px 0}
  .hero{padding:56px 0 48px}
  .detail-top{flex-direction:column;align-items:center;text-align:center;gap:18px}
  .detail-badges,.detail-actions{justify-content:center}
  .data-grid{grid-template-columns:1fr}
  .filter-row{gap:8px}
  .filter-label{width:100%;padding-top:0}
  .footer-inner{gap:28px}
}
@media(max-width:480px){
  .card-grid{grid-template-columns:1fr}
  .hero-search button{padding:0 18px}
  .logo-text em{display:none}
}
@media print{
  .site-header,.site-footer,.hero-search,.detail-actions,.theme-toggle{display:none!important}
  body{background:#fff;color:#000}
}