/* ==========================================================================
   星云导航 · 基础令牌与布局（全新自研）
   ========================================================================== */
:root{
  /* 主题：日间 */
  --bg:#f4f6fb;
  --bg-soft:#eef1f8;
  --bg-card:#ffffff;
  --bg-subtle:#f3f5fb;
  --border:#e8ebf4;
  --text-1:#1a2036;
  --text-2:#4a536e;
  --text-3:#8a93ad;
  --primary:#6366f1;
  --hero-bg1:#101a3f;
  --hero-bg2:#1b2a5e;
  --footer-bg:#111a3a;
  --footer-text:#aab4d4;
  --nav-h:64px;
  --rail-w:60px;
  --sidebar-w:330px;
}
[data-theme="dark"]{
  --bg:#0b1020;
  --bg-soft:#0e1428;
  --bg-card:#131a30;
  --bg-subtle:#18213c;
  --border:#232c48;
  --text-1:#eef1fb;
  --text-2:#c3cae0;
  --text-3:#8891ad;
  --hero-bg1:#080d1c;
  --hero-bg2:#0e1730;
  --footer-bg:#080d1c;
  --footer-text:#8891ad;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--text-1);
  font-family:"Inter","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
  transition:background .35s ease,color .35s ease;
  display:flex;flex-direction:column;min-height:100vh;
}
body>.layout{flex:1}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{width:100%;max-width:1760px;margin:0 auto;padding:0 28px}

/* ---------------- 顶部导航 ---------------- */
.topnav{
  position:sticky;top:0;z-index:60;
  height:var(--nav-h);
  display:flex;align-items:center;gap:18px;
  padding:0 24px;
  background:color-mix(in srgb,var(--bg-card) 82%,transparent);
  -webkit-backdrop-filter:blur(16px) saturate(1.4);backdrop-filter:blur(16px) saturate(1.4);
  border-bottom:1px solid var(--border);
}
.topnav .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.topnav .brand img{width:38px;height:38px;object-fit:contain}
.topnav .nav-menu{display:flex;gap:6px;margin:0 0 0 12px}
.topnav .nav-menu a{
  padding:8px 16px;border-radius:10px;font-size:14.5px;font-weight:600;color:var(--text-2);
  transition:.25s;
}
.topnav .nav-menu a:hover,.topnav .nav-menu a.active{color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6)}
.topnav .nav-actions{display:flex;align-items:center;gap:10px}
.icon-btn{
  width:40px;height:40px;border-radius:12px;border:1px solid var(--border);
  background:var(--bg-card);color:var(--text-2);cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-size:17px;transition:.25s;
}
.icon-btn:hover{color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6);border-color:transparent;transform:translateY(-2px)}
.menu-toggle{display:none}

/* ---------------- Hero ---------------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 420px at 78% -10%,rgba(217,70,239,.35),transparent 60%),
    radial-gradient(800px 460px at 12% 10%,rgba(6,182,212,.30),transparent 60%),
    linear-gradient(135deg,var(--hero-bg1),var(--hero-bg2));
  padding:74px 24px 96px;
}
.hero::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:140px;
  background:linear-gradient(to bottom,
    transparent 0%,
    color-mix(in srgb,var(--bg) 25%,transparent) 45%,
    color-mix(in srgb,var(--bg) 70%,transparent) 75%,
    var(--bg) 100%);
}
#snow-canvas{position:fixed;inset:0;width:100vw;height:100vh;display:none;pointer-events:none;z-index:9999;position:fixed;inset:0;pointer-events:none}
.hero-inner{position:relative;z-index:2;max-width:880px;margin:0 auto;text-align:center}
.hero h1{color:#fff;font-size:44px;margin:0 0 14px;letter-spacing:.02em;font-weight:800}
.hero p.sub{color:rgba(255,255,255,.78);font-size:16px;margin:0 0 34px}

/* 搜索玻璃卡 */
.search-card{
  background:rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.22);
  -webkit-backdrop-filter:blur(18px) saturate(1.5);backdrop-filter:blur(18px) saturate(1.5);
  border-radius:22px;padding:16px;box-shadow:0 28px 64px -16px rgba(0,0,0,.55)
}
.search-types{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:12px}
.search-types button{
  border:none;background:transparent;color:#fff;text-shadow:0 1px 4px rgba(0,0,0,.5);background:rgba(255,255,255,.15);backdrop-filter:blur(6px);
  padding:7px 16px;border-radius:999px;font-size:13.5px;font-weight:600;cursor:pointer;transition:.25s;
}
.search-types button.active{color:#fff;background:linear-gradient(135deg,#8b5cf6,#d946ef);box-shadow:0 6px 16px -6px rgba(217,70,239,.7)}
.search-row{display:flex;gap:10px}
.search-row input{
  flex:1;height:48px;border-radius:14px;border:1px solid rgba(255,255,255,.3);
  background:rgba(255,255,255,.95);padding:0 18px;font-size:15px;color:#1a2036;
}
.search-row input:focus{outline:none;border-color:#a78bfa;box-shadow:0 0 0 4px rgba(167,139,250,.25)}
.search-row button.go{
  height:48px;padding:0 26px;border:none;border-radius:14px;cursor:pointer;font-weight:700;font-size:15px;color:#fff;
  background:linear-gradient(135deg,#6366f1,#8b5cf6);box-shadow:0 10px 24px -8px rgba(99,102,241,.7);transition:.25s;
}
.search-row button.apply{
  height:48px;padding:0 22px;border:none;border-radius:14px;cursor:pointer;font-weight:700;font-size:14px;color:#fff;
  background:linear-gradient(135deg,#f59e0b,#f97316);box-shadow:0 10px 24px -8px rgba(249,115,22,.6);
}
.search-row button:hover{transform:translateY(-2px);filter:brightness(1.06)}

/* ---------------- 主体布局 ---------------- */
.layout{display:flex;gap:22px;align-items:stretch;padding:26px 28px 40px;width:100%;max-width:1760px;margin:0 auto}
.content{flex:1;min-width:0}
.sidebar{width:var(--sidebar-w);flex-shrink:0;display:flex;flex-direction:column;gap:16px;align-self:stretch}
.sidebar::-webkit-scrollbar{width:7px}
.sidebar::-webkit-scrollbar-thumb{background:rgba(120,130,180,.45);border-radius:8px}
.sidebar::-webkit-scrollbar-track{background:transparent}

/* 左侧图标轨道（桌面） */
.rail{display:none!important}
.rail.hide{opacity:0;pointer-events:none;transform:translateY(-50%) translateX(-170%)}
.rail a{
  position:relative;width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  color:var(--text-2);font-size:18px;transition:.25s;
}
.rail a:hover{color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6)}
.rail a .tip{
  position:absolute;left:calc(100% + 12px);top:50%;transform:translateY(-50%) translateX(-8px);
  background:#1f2748;color:#fff;font-size:13px;font-weight:600;padding:6px 12px;border-radius:9px;white-space:nowrap;
  opacity:0;pointer-events:none;transition:.22s;box-shadow:0 8px 20px -6px rgba(0,0,0,.4)
}
.rail a:hover .tip{opacity:1;transform:translateY(-50%) translateX(0)}

/* 通用玻璃面板 */
.panel{
  background:var(--bg-card);border:1px solid var(--border);border-radius:18px;padding:18px 20px;
}
.panel .p-title{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;margin:0 0 14px}
.panel .p-title i{color:#8b5cf6}

/* 分类区块 */
.cat-block{margin-bottom:22px}
.cat-head{display:flex;align-items:center;gap:12px;margin:0 0 14px}
.cat-head h2{margin:0;font-size:20px;display:flex;align-items:center;gap:10px}
.cat-head h2 i{
  width:34px;height:34px;border-radius:11px;display:inline-flex;align-items:center;justify-content:center;
  color:#fff;background:linear-gradient(135deg,#6366f1,#8b5cf6);font-size:15px;
}
.cat-head .count{color:var(--text-3);font-size:13px;font-weight:600}
.cat-head .more{margin-left:auto;color:var(--primary);font-size:13.5px;font-weight:600}
.site-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}

/* 站点卡 */
.site-card{
  position:relative;display:flex;align-items:center;gap:11px;padding:13px 14px;overflow:hidden;
  background:var(--bg-card);border:1px solid var(--border);border-radius:15px;transition:.3s;
}
.site-card:hover{transform:translateY(-4px);box-shadow:0 16px 34px -12px rgba(40,50,110,.22);border-color:rgba(99,102,241,.4)}
.site-card .ico{
  width:42px;height:42px;border-radius:11px;object-fit:contain;background:#fff;padding:5px;flex-shrink:0;
  box-shadow:inset 0 0 0 1px var(--border);
}
[data-theme="dark"] .site-card .ico{background:#fff}
.site-card .info{min-width:0}
.site-card .name{font-weight:700;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.site-card .desc{color:var(--text-3);font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.site-card .meta{display:flex;align-items:center;gap:6px;margin-top:4px;font-size:11.5px;color:var(--text-3)}
.stars{color:#f59e0b;font-size:11px;letter-spacing:1px}

/* 排行列表 */
.rank-list{display:flex;flex-direction:column;gap:9px}
.rank-row{display:flex;align-items:center;gap:10px;font-size:13.5px}
.rank-row .rank-num{
  width:24px;height:24px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;
  background:var(--bg-subtle);color:var(--text-2);font-weight:700;font-size:12px;flex-shrink:0;
}
.rank-row .rank-num.t1{background:linear-gradient(135deg,#f59e0b,#f97316);color:#fff}
.rank-row .rank-num.t2{background:linear-gradient(135deg,#94a3b8,#64748b);color:#fff}
.rank-row .rank-num.t3{background:linear-gradient(135deg,#d97706,#b45309);color:#fff}
.rank-row img.r-ico{width:20px;height:20px;border-radius:5px;object-fit:contain;background:#fff}
.rank-row .r-name{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:600}
.rank-row .r-val{color:var(--text-3);font-size:12px;font-weight:600}

/* 统计胶囊行 */
.stat-strip{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.stat-strip .chip{
  background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:9px 16px;font-size:13.5px;font-weight:600;color:var(--text-2)
}
.stat-strip .chip b{color:var(--primary);font-size:16px;margin-left:4px}

/* 折叠按钮 */
.card-toggle{
  display:block;margin:12px auto 0;border:1px dashed rgba(99,102,241,.5);background:transparent;
  color:var(--primary);font-weight:600;font-size:13px;padding:8px 22px;border-radius:999px;cursor:pointer;transition:.25s;
}
.card-toggle:hover{background:rgba(99,102,241,.08)}
/* 展开后由各响应式规则的 :not(.expanded) 放行全部卡片 */

/* ---------------- 页脚 ---------------- */
.footer{background:var(--footer-bg);color:var(--footer-text);padding:40px 24px 26px;margin-top:20px}
.footer .container{display:flex;flex-wrap:wrap;gap:30px}
.footer h4{color:#fff;font-size:15px;margin:0 0 12px}
.footer a{display:block;color:var(--footer-text);font-size:13.5px;padding:4px 0;transition:.2s}
.footer a:hover{color:#fff}
.footer .copy{width:100%;border-top:1px solid rgba(255,255,255,.1);margin-top:18px;padding-top:16px;font-size:13px;text-align:center}

/* ---------------- 移动端抽屉 ---------------- */
.drawer-mask{display:none;position:fixed;inset:0;background:rgba(8,12,28,.5);z-index:70}
.drawer{
  position:fixed;top:0;left:-300px;width:280px;height:100%;z-index:71;
  background:var(--bg-card);border-right:1px solid var(--border);
  padding:20px;overflow-y:auto;transition:left .32s cubic-bezier(.22,.61,.36,1);
}
.drawer.open{left:0}
.drawer h3{margin:0 0 16px;font-size:17px}
.drawer a.d-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;color:var(--text-2);font-weight:600;font-size:14.5px;transition:.2s}
.drawer a.d-item:hover{background:var(--bg-subtle);color:var(--primary)}
.drawer a.d-item i{width:20px;text-align:center;color:#8b5cf6}

/* ---------------- 响应式 ---------------- */
/* 桌面 ≥1201：5 列，展示 15 个 */
@media(min-width:1201px){
  .cat-block .site-grid:not(.expanded) .site-card:nth-child(n+16){display:none}
  /* 为左侧固定轨道预留安全槽，避免遮挡横幅/内容 */
  .layout{padding-left:28px}
}
@media(max-width:1200px){
  .site-grid{grid-template-columns:repeat(4,1fr)}
  .cat-block .site-grid:not(.expanded) .site-card:nth-child(n+13){display:none}
  /* 平板端隐藏固定轨道，统一使用左侧抽屉，避免遮挡内容 */
  .rail{display:none}
}
/* 平板横屏（触屏、宽屏）：固定 4 列，展示 12 个，不随分辨率变 5 列 */
@media(pointer:coarse) and (min-width:1024px) and (orientation:landscape){
  .site-grid{grid-template-columns:repeat(4,1fr)}
  .cat-block .site-grid:not(.expanded) .site-card:nth-child(n+13){display:none}
}
/* 平板竖屏（触屏、竖屏、≥768）：固定 3 列，展示 9 个 */
@media(pointer:coarse) and (min-width:768px) and (orientation:portrait){
  .site-grid{grid-template-columns:repeat(3,1fr)}
  .cat-block .site-grid:not(.expanded) .site-card:nth-child(n+10){display:none}
}
@media(max-width:1023px){
  .sidebar{position:static;width:100%}
  .layout{flex-direction:column}
  /* 平板竖屏：3 列，展示 9 个 */
  .site-grid{grid-template-columns:repeat(3,1fr)}
  .cat-block .site-grid:not(.expanded) .site-card:nth-child(n+10){display:none}
}
@media(min-width:768px) and (max-width:1023px){
  /* 顶导紧凑，避免换行 */
  .topnav .nav-menu{gap:2px}
  .topnav .nav-menu a{padding:7px 9px;font-size:12.5px;border-radius:9px}
}
@media(max-width:767px){
  .rail{display:none}
  .topnav .nav-menu{display:none}
  .topnav{padding:0 14px;gap:10px}
  .topnav .brand{margin:0 auto}
  .topnav .nav-actions{margin-left:0}

  .menu-toggle{display:flex}
  .hero{padding:52px 16px 74px}
  .hero h1{font-size:30px}
  .site-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .cat-block .site-grid:not(.expanded) .site-card:nth-child(n+13){display:none}
  /* 手机端卡片紧凑、内容不切 */
  .site-card{padding:11px 12px;gap:9px}
  .site-card .site-ico{width:36px;height:36px;padding:5px;flex:none}
  .site-card .site-name{font-size:13.5px}
  .site-card .site-desc{-webkit-line-clamp:2}
  .site-card .site-meta{font-size:11px}
  .search-row{flex-direction:column}
  .search-row button.go,.search-row button.apply{width:100%;flex:none}
  .layout{padding:20px 14px 30px}
}
.layout{max-width:1400px!important}

.search-types button{color:#fff!important;background:rgba(0,0,0,.25)!important;text-shadow:0 1px 3px rgba(0,0,0,.6);border:1px solid rgba(255,255,255,.2)}
.search-types button:hover{background:rgba(0,0,0,.4)!important}
.search-types button.active{background:linear-gradient(135deg,#8b5cf6,#d946ef)!important;text-shadow:none;border-color:transparent}
.topnav,.rail,.footer,.layout{position:relative;z-index:1}
/* 背景特效在底层 */
header.topnav, main, .container, footer, .layout, aside, section { position:relative; z-index:1; }