/* =====================================================
   前台样式（全面美化版）
   设计语言：现代渐变 + 玻璃拟态 + 微动效
   ===================================================== */
*,*::before,*::after{box-sizing:border-box}
:root{
  --blue:#3b82f6; --blue-dark:#2563eb; --blue-light:#60a5fa;
  --purple:#8b5cf6; --cyan:#06b6d4; --success:#10b981; --warning:#f59e0b; --danger:#ef4444;
  --bg:#f5f7fb; --card:#fff; --text:#1e293b; --text-2:#475569; --muted:#94a3b8;
  --border:#e2e8f0; --border-light:#f1f5f9; --tag-bg:#eff6ff; --tag:#3b82f6;
  --radius-sm:6px; --radius:10px; --radius-lg:14px; --radius-xl:18px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.04);
  --shadow:0 2px 10px rgba(15,23,42,.06);
  --shadow-md:0 6px 20px rgba(15,23,42,.08);
  --shadow-lg:0 12px 36px rgba(15,23,42,.14);
  --gradient-primary:linear-gradient(135deg,#3b82f6,#8b5cf6);
  --gradient-hero:linear-gradient(135deg,#3b82f6 0%,#6366f1 40%,#8b5cf6 100%);
  --gradient-card:linear-gradient(135deg,rgba(59,130,246,.06),rgba(139,92,246,.06));
}
html,body{margin:0;padding:0;scroll-behavior:smooth}
body{font-family:"Segoe UI","Microsoft YaHei",-apple-system,system-ui,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6;font-size:15px;font-feature-settings:"tnum"}
a{color:var(--blue);text-decoration:none;transition:color .15s}
a:hover{text-decoration:underline}
code{font-family:"Cascadia Code",Consolas,Menlo,monospace;font-size:13px;background:#f0f3fa;padding:1px 6px;border-radius:4px;word-break:break-all}
.container{max-width:1200px;margin:0 auto;padding:0 18px}

/* ===== 滚动条 ===== */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(148,163,184,.4);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:rgba(148,163,184,.6)}

/* ===== 顶部 ===== */
.site-header{
  background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:20;
  box-shadow:var(--shadow-sm);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 18px}
.brand{display:flex;align-items:center;gap:12px;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-logo{
  width:42px;height:42px;border-radius:12px;background:var(--gradient-primary);
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;
  box-shadow:0 4px 14px rgba(59,130,246,.4);position:relative;overflow:hidden;
}
.brand-logo::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.3),transparent 50%)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:18px;font-weight:700;letter-spacing:-.2px}
.brand-text small{color:var(--muted);font-size:12px}
.search-box{display:flex;flex:1;max-width:440px}
.search-box input{
  flex:1;border:1.5px solid var(--border);border-right:none;border-radius:var(--radius) 0 0 var(--radius);
  padding:10px 14px;font-size:14px;outline:none;transition:all .2s;background:#fff;
}
.search-box input:focus{border-color:var(--blue);box-shadow:inset 0 0 0 3px rgba(59,130,246,.1)}
.search-box button{
  border:0;background:var(--gradient-primary);color:#fff;padding:0 20px;
  border-radius:0 var(--radius) var(--radius) 0;cursor:pointer;font-size:14px;font-weight:500;
  transition:all .2s;box-shadow:0 2px 8px rgba(59,130,246,.25);
}
.search-box button:hover{box-shadow:0 4px 12px rgba(59,130,246,.4)}

/* ===== 布局 ===== */
.layout{display:flex;gap:22px;padding:22px 18px;align-items:flex-start}
.sidebar{width:220px;flex:0 0 220px;position:sticky;top:84px}
.nav-menu{
  background:var(--card);border:1px solid var(--border-light);border-radius:var(--radius-lg);
  padding:10px;box-shadow:var(--shadow);display:flex;flex-direction:column;
}
.nav-link{
  padding:10px 14px;border-radius:var(--radius);color:var(--text);font-size:14px;font-weight:500;
  transition:all .18s;display:flex;align-items:center;gap:8px;
}
.nav-link::before{content:"";width:4px;height:16px;border-radius:2px;background:transparent;transition:background .18s}
.nav-link:hover{background:var(--tag-bg);text-decoration:none;color:var(--blue)}
.nav-link:hover::before{background:var(--blue)}
.nav-link.active{background:var(--gradient-primary);color:#fff;font-weight:600;box-shadow:0 2px 10px rgba(59,130,246,.3)}
.nav-link.active::before{background:#fff}
.content{flex:1;min-width:0}

/* ===== Hero ===== */
.hero{
  background:var(--gradient-hero);color:#fff;border-radius:var(--radius-xl);padding:44px 36px;
  margin-bottom:24px;position:relative;overflow:hidden;
  box-shadow:0 12px 36px rgba(59,130,246,.28);animation:fadeUp .6s cubic-bezier(.4,0,.2,1);
}
.hero-glow{position:absolute;border-radius:50%;filter:blur(60px);opacity:.35;pointer-events:none}
.hero-glow-1{width:340px;height:340px;background:#fff;top:-100px;right:-80px;animation:floatGlow 9s ease-in-out infinite}
.hero-glow-2{width:260px;height:260px;background:#ec4899;bottom:-110px;left:15%;animation:floatGlow 11s ease-in-out infinite reverse}
.hero-glow-3{width:200px;height:200px;background:#22d3ee;top:30%;left:-60px;animation:floatGlow 13s ease-in-out infinite}
.hero-content{position:relative;z-index:1}
.hero-badge{
  display:inline-block;background:rgba(255,255,255,.18);backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.25);padding:5px 14px;border-radius:20px;
  font-size:12px;font-weight:500;margin-bottom:14px;animation:fadeIn .8s .2s backwards;
}
.hero h1{
  margin:0 0 10px;font-size:30px;font-weight:800;letter-spacing:-.5px;
  text-shadow:0 2px 12px rgba(0,0,0,.12);animation:fadeUp .6s cubic-bezier(.4,0,.2,1) .1s backwards;
}
.hero p{
  margin:0 0 22px;opacity:.96;font-size:15px;max-width:660px;
  animation:fadeUp .6s cubic-bezier(.4,0,.2,1) .2s backwards;
}
.hero .stat{display:flex;gap:30px;flex-wrap:wrap;animation:fadeUp .6s cubic-bezier(.4,0,.2,1) .3s backwards}
.hero .stat-item{display:flex;flex-direction:column;gap:2px}
.hero .stat strong{font-size:28px;font-weight:800;line-height:1.2;font-variant-numeric:tabular-nums}
.hero .stat span{opacity:.9;font-size:13px;font-weight:500}
.hero .stat-divider{width:1px;background:rgba(255,255,255,.25);align-self:stretch}
@keyframes floatGlow{
  0%,100%{transform:translate(0,0) scale(1)}
  50%{transform:translate(20px,-15px) scale(1.08)}
}

/* ===== 快捷分类区 ===== */
.quick-cats{
  background:var(--card);border:1px solid var(--border-light);border-radius:var(--radius-lg);
  padding:18px;margin-bottom:24px;box-shadow:var(--shadow);
  animation:fadeUp .5s cubic-bezier(.4,0,.2,1) .1s backwards;
}
.quick-cats-title{
  font-size:13px;color:var(--muted);font-weight:600;margin:0 0 12px;
  text-transform:uppercase;letter-spacing:.8px;display:flex;align-items:center;gap:6px;
}
.quick-cats-title::before{content:"🏷️";font-size:14px}
.quick-cats-list{display:flex;flex-wrap:wrap;gap:8px}
.quick-cat{
  display:inline-flex;align-items:center;gap:6px;padding:7px 14px;
  background:var(--border-light);color:var(--text-2);font-size:13px;font-weight:500;
  border-radius:20px;text-decoration:none;transition:all .2s;border:1px solid transparent;
}
.quick-cat-icon{font-size:14px;line-height:1;display:inline-flex;align-items:center}
.quick-cat:hover{
  background:var(--blue);color:#fff;text-decoration:none;border-color:var(--blue);
  box-shadow:0 2px 10px rgba(59,130,246,.3);transform:translateY(-1px);
}

/* ===== 区块 ===== */
.block{margin-bottom:28px}
.block-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;flex-wrap:wrap;gap:10px}
.block-title{
  font-size:20px;margin:0;font-weight:700;color:var(--text);letter-spacing:-.3px;
  display:flex;align-items:center;gap:10px;
}
.block-title::before{content:"";width:4px;height:22px;background:var(--gradient-primary);border-radius:2px}
.block-sub{color:var(--muted);font-size:13px;margin:6px 0 0}
.block-more{
  font-size:13px;color:var(--blue);font-weight:500;padding:6px 12px;
  border-radius:var(--radius);transition:all .2s;
}
.block-more:hover{background:var(--tag-bg);text-decoration:none}

/* ===== 面包屑 ===== */
.breadcrumb{font-size:13px;color:var(--muted);margin:0 0 16px;padding:0 2px;display:flex;align-items:center;gap:6px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb .sep{opacity:.5}

/* ===== 页脚导航 ===== */
.footer-nav{
  display:flex;flex-wrap:wrap;gap:6px 14px;padding:16px 18px;font-size:12px;color:var(--muted);
  border-top:1px solid var(--border-light);background:var(--card);
}
.footer-nav a{color:var(--muted);padding:4px 8px;border-radius:4px;transition:all .15s}
.footer-nav a:hover{color:var(--blue);background:var(--tag-bg);text-decoration:none}

/* ===== 友情链接 ===== */
.friend-links{
  display:flex;align-items:center;flex-wrap:wrap;gap:10px 14px;padding:14px 18px;
  font-size:13px;border-top:1px solid var(--border-light);background:var(--card);
}
.friend-links-title{
  font-size:12px;color:var(--muted);font-weight:600;text-transform:uppercase;
  letter-spacing:.6px;flex-shrink:0;display:flex;align-items:center;gap:5px;
}
.friend-links-title::before{content:"🔗";font-size:13px}
.friend-links-list{display:flex;flex-wrap:wrap;gap:8px}
.friend-link{
  display:inline-flex;align-items:center;padding:5px 12px;background:var(--border-light);
  color:var(--text-2);font-size:13px;border-radius:16px;transition:all .18s;
  border:1px solid transparent;
}
.friend-link:hover{
  background:var(--blue);color:#fff;text-decoration:none;border-color:var(--blue);
  box-shadow:0 2px 8px rgba(59,130,246,.3);transform:translateY(-1px);
}

/* ===== 卡片 ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:18px}
.card{
  background:var(--card);border:1px solid var(--border-light);border-radius:var(--radius-lg);
  padding:20px;box-shadow:var(--shadow);transition:all .25s cubic-bezier(.4,0,.2,1);
  display:flex;flex-direction:column;position:relative;overflow:hidden;
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--gradient-primary);opacity:0;transition:opacity .25s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(59,130,246,.2)}
.card:hover::before{opacity:1}
.card-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.tag{
  background:var(--tag-bg);color:var(--tag);font-size:12px;padding:3px 10px;border-radius:20px;
  font-weight:500;transition:all .15s;
}
.tag:hover{background:var(--blue);color:#fff}
.card-title{font-size:15px;margin:0 0 14px;line-height:1.5;flex:1;font-weight:600;color:var(--text)}
.card-download{
  display:inline-flex;align-items:center;gap:6px;background:var(--gradient-primary);color:#fff;
  padding:10px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;width:fit-content;
  transition:all .2s;box-shadow:0 2px 8px rgba(59,130,246,.25);
}
.card-download:hover{
  text-decoration:none;box-shadow:0 4px 14px rgba(59,130,246,.4);transform:translateY(-1px);color:#fff;
}
.dl-icon{font-size:14px}
.dl-count{font-size:12px;font-weight:400;opacity:.95;margin-left:4px;padding:2px 8px;background:rgba(255,255,255,.22);border-radius:10px}
.card-meta{margin-top:14px;border-top:1px dashed var(--border);padding-top:12px;font-size:13px;margin-bottom:0}
.card-meta dt{display:inline;color:var(--text-2);font-weight:600}
.card-meta dd{display:inline;margin:0}
.meta-row{margin-bottom:6px;color:var(--muted);word-break:break-all}
.meta-row:last-child{margin-bottom:0}
.hash-row code{cursor:pointer;transition:all .15s}
.hash-row code:hover{background:#e6edff;color:var(--blue)}
.hash-row code.copied{background:var(--success);color:#fff}

/* ===== 热门下载卡片 ===== */
.popular-block .block-title{color:#dc2626}
.popular-block .block-title::before{background:linear-gradient(135deg,#f59e0b,#ef4444)}
.cards-popular{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.card-popular{
  background:linear-gradient(135deg,#fff,#fffbf5);border:1px solid #fde68a;
  border-radius:var(--radius-lg);padding:20px;position:relative;overflow:hidden;
  box-shadow:0 4px 14px rgba(245,158,11,.1);transition:all .25s cubic-bezier(.4,0,.2,1);
  display:flex;flex-direction:column;animation:fadeUp .45s cubic-bezier(.4,0,.2,1) backwards;
}
.card-popular::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(135deg,#f59e0b,#ef4444);
}
.card-popular:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(245,158,11,.22);border-color:#fbbf24}
.rank-badge{
  position:absolute;top:14px;right:14px;width:28px;height:28px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;
  color:#fff;background:#94a3b8;box-shadow:0 2px 6px rgba(0,0,0,.15);z-index:2;
}
.rank-1{background:linear-gradient(135deg,#fbbf24,#f59e0b);box-shadow:0 2px 10px rgba(245,158,11,.5)}
.rank-2{background:linear-gradient(135deg,#cbd5e1,#94a3b8);box-shadow:0 2px 10px rgba(148,163,184,.5)}
.rank-3{background:linear-gradient(135deg,#d97706,#92400e);box-shadow:0 2px 10px rgba(146,64,14,.5)}
.tag-cat{background:#fef3c7;color:#d97706}
.tag-cat:hover{background:#f59e0b;color:#fff}
.card-link{
  margin-top:12px;font-size:13px;color:var(--blue);font-weight:500;
  transition:all .15s;display:inline-flex;align-items:center;gap:2px;
}
.card-link:hover{gap:6px;text-decoration:none}

/* ===== 回到顶部 ===== */
.back-to-top{
  position:fixed;right:24px;bottom:28px;width:44px;height:44px;border-radius:50%;
  border:0;background:var(--gradient-primary);color:#fff;cursor:pointer;
  box-shadow:0 6px 20px rgba(59,130,246,.4);display:flex;align-items:center;justify-content:center;
  opacity:0;visibility:hidden;transform:translateY(12px);transition:all .25s;z-index:50;
}
.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{box-shadow:0 8px 26px rgba(59,130,246,.55);transform:translateY(-2px)}

/* ===== 滚动渐显 ===== */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .55s cubic-bezier(.4,0,.2,1),transform .55s cubic-bezier(.4,0,.2,1)}
.reveal.in{opacity:1;transform:translateY(0)}

/* ===== 单页/FAQ ===== */
.page-content{background:var(--card);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:28px 30px;box-shadow:var(--shadow)}
.rich-text h2{font-size:18px;margin:24px 0 12px;color:var(--text);font-weight:700;padding-left:12px;border-left:4px solid var(--blue)}
.rich-text h2:first-child{margin-top:0}
.rich-text p{margin:0 0 14px;color:var(--text-2)}
.rich-text code{font-size:13px}

/* ===== 通用 ===== */
.empty{color:var(--muted);padding:40px;text-align:center;font-size:14px}

/* ===== 页脚 ===== */
.site-footer{background:#0f172a;color:#94a3b8;padding:32px 18px 24px;text-align:center;font-size:13px;margin-top:20px}
.site-footer p{margin:6px 0}
.footer-links a{margin:0 10px;color:#94a3b8;transition:color .15s}
.footer-links a:hover{color:var(--blue-light)}

/* ===== 动画 ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.card{animation:fadeUp .45s cubic-bezier(.4,0,.2,1) backwards}
.card:nth-child(1){animation-delay:.05s}
.card:nth-child(2){animation-delay:.1s}
.card:nth-child(3){animation-delay:.15s}
.card:nth-child(4){animation-delay:.2s}
.card:nth-child(5){animation-delay:.25s}
.card:nth-child(6){animation-delay:.3s}
.card:nth-child(7){animation-delay:.35s}
.card:nth-child(8){animation-delay:.4s}

/* ===== 响应式 ===== */
@media (max-width:860px){
  .layout{flex-direction:column}
  .sidebar{width:100%;position:static;order:-1}
  .nav-menu{flex-direction:row;flex-wrap:wrap}
  .nav-link{flex:1 1 auto;text-align:center}
  .nav-link::before{display:none}
  .header-inner{flex-wrap:wrap;padding:12px 14px}
  .search-box{order:3;max-width:100%;flex-basis:100%}
  .cards,.cards-popular{grid-template-columns:1fr}
  .hero{padding:30px 22px}
  .hero h1{font-size:22px}
  .hero .stat{gap:16px 22px}
  .hero .stat strong{font-size:22px}
  .hero .stat-divider{display:none}
  .back-to-top{right:16px;bottom:20px;width:40px;height:40px}
}
@media (max-width:480px){
  .hero .stat{gap:14px 18px}
  .hero .stat strong{font-size:20px}
  .hero-badge{font-size:11px}
}