/* ===== 设计变量 ===== */
:root{
  --brand:#4f46e5;
  --brand-600:#4338ca;
  --brand-50:#eef2ff;
  --accent:#0ea5a4;
  --warn:#f59e0b;
  --danger:#ef4444;
  --text:#171a26;
  --text-2:#4b5163;
  --muted:#7b8194;
  --line:#e7e9f2;
  --bg:#ffffff;
  --bg-soft:#f7f8fc;
  --card:#ffffff;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(20,24,45,.04),0 8px 24px rgba(20,24,45,.06);
  --shadow-hover:0 4px 12px rgba(20,24,45,.08),0 16px 40px rgba(20,24,45,.10);
  --wrap:1200px;
  --header-h:64px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px);}
body{
  margin:0;
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none;}
img{max-width:100%;display:block;}
h1,h2,h3,h4{margin:0;line-height:1.3;font-weight:700;letter-spacing:-.01em;}
p{margin:0;}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px;}
.icon{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none;}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--brand);color:#fff;padding:10px 16px;border-radius:0 0 8px 0;
}
.skip-link:focus{left:0;}

:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px;}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:38px;padding:0 16px;border-radius:10px;
  font-size:14px;font-weight:600;white-space:nowrap;
  transition:background .18s,color .18s,border-color .18s,transform .18s,box-shadow .18s;
}
/* .btn 的 display 会盖掉浏览器对 hidden 属性的默认隐藏，这里强制兜底 */
[hidden]{display:none!important;}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 2px 8px rgba(79,70,229,.28);}
.btn-primary:hover{background:var(--brand-600);transform:translateY(-1px);}
.btn-outline{border:1px solid var(--line);color:var(--text);background:#fff;}
.btn-outline:hover{border-color:var(--brand);color:var(--brand);}
.btn-ghost{color:var(--text-2);}
.btn-ghost:hover{background:var(--bg-soft);color:var(--brand);}

/* ===== 头部 ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  height:var(--header-h);
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.header-inner{height:var(--header-h);display:flex;align-items:center;gap:24px;}

.logo{display:flex;align-items:center;gap:10px;flex:none;}
.logo-mark{
  width:34px;height:34px;border-radius:9px;flex:none;
  background:linear-gradient(135deg,var(--brand),#7c73f0);
  color:#fff;font-size:17px;font-weight:700;
  display:grid;place-items:center;
}
.logo-text{font-size:17px;font-weight:700;letter-spacing:-.02em;line-height:1.15;}
.logo-sub{display:block;font-size:11px;font-weight:400;color:var(--muted);letter-spacing:0;}

.main-nav{display:flex;align-items:center;gap:4px;margin-right:auto;}
.nav-item{
  position:relative;padding:8px 14px;border-radius:9px;
  font-size:15px;font-weight:500;color:var(--text-2);
  transition:background .18s,color .18s;
}
.nav-item:hover{background:var(--bg-soft);color:var(--text);}
.nav-item.is-active{color:var(--brand);background:var(--brand-50);}

.header-actions{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-toggle{display:none;width:40px;height:40px;border-radius:10px;padding:9px;}
.nav-toggle span{display:block;height:2px;background:var(--text);border-radius:2px;margin:4px 0;transition:.2s;}

/* ===== 首屏 ===== */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 380px at 12% -10%,rgba(79,70,229,.13),transparent 60%),
    radial-gradient(700px 320px at 88% 0%,rgba(14,165,164,.12),transparent 60%),
    var(--bg);
  border-bottom:1px solid var(--line);
}
.hero-inner{padding:40px 20px 52px;max-width:860px;}

.crumb{margin-bottom:20px;}
.crumb ol{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);flex-wrap:wrap;}
.crumb a:hover{color:var(--brand);}
.crumb li+li::before{content:"›";margin-right:8px;color:#c3c7d4;}

.hero-title{font-size:clamp(28px,4.4vw,44px);font-weight:800;letter-spacing:-.03em;}
.hero-title .hl{
  display:block;margin-top:6px;font-size:.58em;font-weight:600;
  color:var(--brand);letter-spacing:-.01em;
}
.hero-desc{margin-top:18px;font-size:16px;color:var(--text-2);max-width:640px;}
.hero-desc strong{color:var(--text);}

.hero-search{
  margin-top:26px;display:flex;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:8px 8px 8px 16px;box-shadow:var(--shadow);
  max-width:620px;transition:border-color .18s,box-shadow .18s;
}
.hero-search:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px rgba(79,70,229,.12);}
.hero-search .icon{color:var(--muted);width:20px;height:20px;}
.hero-search input{
  flex:1;min-width:0;border:0;outline:0;background:none;
  font-size:16px;height:38px;color:var(--text);
}
.hero-search input::placeholder{color:#a2a8ba;}

.hot-words{margin-top:16px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;}
.hot-label{color:var(--muted);}
.hot-word{
  padding:5px 12px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--text-2);
  font-size:13px;transition:.18s;
}
.hot-word:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-50);}

.hero-stats{margin-top:34px;display:flex;gap:40px;flex-wrap:wrap;}
.hero-stats b{display:block;font-size:26px;font-weight:800;letter-spacing:-.02em;}
.hero-stats span{font-size:13px;color:var(--muted);}

/* ===== 区块通用 ===== */
.section{padding:64px 0;}
.section-soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.sec-head{margin-bottom:28px;}
.sec-title{font-size:clamp(21px,2.6vw,27px);letter-spacing:-.02em;}
.sec-sub{margin-top:8px;color:var(--muted);font-size:14.5px;}

/* ===== 场景卡片 ===== */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(258px,1fr));gap:16px;}
.cat-card{
  display:flex;gap:14px;padding:18px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.cat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#d5d9ea;}
.cat-ico{
  width:44px;height:44px;border-radius:12px;flex:none;
  display:grid;place-items:center;color:#fff;
}
.cat-ico .icon{width:22px;height:22px;}
.cat-body{display:block;min-width:0;}
.cat-name{display:block;font-size:16px;font-weight:700;}
.cat-meta{margin-top:4px;font-size:13px;color:var(--muted);}
.cat-tags{margin-top:10px;display:flex;gap:6px;flex-wrap:wrap;}
.cat-tags span{
  font-size:12px;color:var(--text-2);background:var(--bg-soft);
  border:1px solid var(--line);border-radius:6px;padding:2px 8px;
}

/* ===== 学科 chips ===== */
.chip-grid{display:flex;gap:10px;flex-wrap:wrap;}
.subj-chip{
  display:flex;align-items:center;gap:8px;
  padding:10px 18px;border-radius:999px;
  background:#fff;border:1px solid var(--line);
  font-size:15px;font-weight:600;transition:.18s;
}
.subj-chip:hover{border-color:var(--brand);color:var(--brand);box-shadow:var(--shadow);}
.subj-chip em{font-style:normal;font-size:12px;font-weight:500;color:var(--muted);}

/* ===== 筛选条 ===== */
.filter-bar{
  display:flex;flex-direction:column;gap:12px;
  padding:16px 18px;margin-bottom:24px;
  background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);
}
.filter-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap;}
.filter-label{font-size:13px;color:var(--muted);flex:none;width:32px;}
.chips{display:flex;gap:8px;flex-wrap:wrap;}
.chip{
  padding:6px 14px;border-radius:999px;font-size:13.5px;
  background:#fff;border:1px solid var(--line);color:var(--text-2);transition:.16s;
}
.chip:hover{border-color:var(--brand);color:var(--brand);}
.chip.is-on{background:var(--brand);border-color:var(--brand);color:#fff;}

/* ===== 工具卡片 ===== */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(288px,1fr));gap:16px;}
.tool-card{
  position:relative;display:flex;flex-direction:column;
  padding:18px;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.tool-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#d5d9ea;}
.tool-top{display:flex;gap:12px;align-items:flex-start;}
.tool-logo{
  width:46px;height:46px;border-radius:12px;flex:none;
  display:grid;place-items:center;
  color:#fff;font-weight:700;font-size:17px;
}
.tool-name{font-size:16px;font-weight:700;line-height:1.35;}
.tool-badges{margin-top:5px;display:flex;gap:6px;flex-wrap:wrap;}
.badge{
  font-size:11.5px;font-weight:600;padding:2px 8px;border-radius:6px;line-height:1.6;
}
.badge-free{background:#ecfdf5;color:#047857;}
.badge-freemium{background:#eff6ff;color:#1d4ed8;}
.badge-paid{background:#fef3c7;color:#92400e;}
.badge-new{background:#fdf2f8;color:#be185d;}

.tool-desc{
  margin-top:12px;font-size:13.5px;color:var(--text-2);line-height:1.7;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.tool-tags{margin-top:12px;display:flex;gap:6px;flex-wrap:wrap;}
.tool-tags span{font-size:12px;color:var(--muted);background:var(--bg-soft);border-radius:6px;padding:2px 8px;}

.tool-foot{
  margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:10px;
}
.tool-rating{display:flex;align-items:center;gap:5px;font-size:13px;color:var(--text-2);}
.stars{color:var(--warn);letter-spacing:1px;font-size:13px;}
.tool-actions{display:flex;align-items:center;gap:6px;}
.icon-btn{
  width:32px;height:32px;border-radius:8px;display:grid;place-items:center;
  color:var(--muted);transition:.16s;
}
.icon-btn:hover{background:var(--bg-soft);color:var(--brand);}
.icon-btn.is-fav{color:var(--danger);}
.go-link{font-size:13px;font-weight:600;color:var(--brand);padding:6px 10px;border-radius:8px;}
.go-link:hover{background:var(--brand-50);}

/* ===== 空状态 ===== */
.empty-state{padding:60px 20px;text-align:center;}
.empty-title{font-size:17px;font-weight:700;}
.empty-desc{margin-top:8px;color:var(--muted);font-size:14px;}
.empty-desc a{color:var(--brand);text-decoration:underline;}

/* ===== 榜单 ===== */
.rank-list{display:grid;gap:10px;}
.rank-item{
  display:flex;align-items:center;gap:16px;
  padding:14px 18px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius-sm);
  transition:transform .18s,box-shadow .18s,border-color .18s;
}
.rank-item:hover{transform:translateX(3px);border-color:#d5d9ea;box-shadow:var(--shadow);}
.rank-no{
  width:26px;height:26px;flex:none;border-radius:8px;
  display:grid;place-items:center;font-size:13px;font-weight:800;
  background:var(--bg-soft);color:var(--muted);
}
.rank-item:nth-child(1) .rank-no{background:linear-gradient(135deg,#f59e0b,#f97316);color:#fff;}
.rank-item:nth-child(2) .rank-no{background:linear-gradient(135deg,#94a3b8,#64748b);color:#fff;}
.rank-item:nth-child(3) .rank-no{background:linear-gradient(135deg,#d6a06a,#b4774a);color:#fff;}
.rank-main{flex:1;min-width:0;}
.rank-title{font-size:15.5px;font-weight:600;}
.rank-desc{
  margin-top:3px;font-size:13px;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.rank-score{flex:none;display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-2);}
.score-num{font-size:16px;font-weight:800;color:var(--brand);}
.more-row{margin-top:22px;text-align:center;}

/* ===== 共建 CTA ===== */
.cta-card{
  display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
  padding:34px;border-radius:18px;
  background:linear-gradient(120deg,#4f46e5,#6d5ef0 55%,#0ea5a4);
  color:#fff;
}
.cta-title{font-size:22px;}
.cta-desc{margin-top:10px;font-size:14.5px;opacity:.92;max-width:620px;line-height:1.75;}
.cta-actions{display:flex;gap:10px;flex-wrap:wrap;}
.cta-card .btn-primary{background:#fff;color:var(--brand);box-shadow:none;}
.cta-card .btn-primary:hover{background:#f2f3ff;}
.cta-card .btn-outline{background:transparent;border-color:rgba(255,255,255,.5);color:#fff;}
.cta-card .btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.12);color:#fff;}

/* ===== 页脚 ===== */
.site-footer{background:#12141d;color:#c9cddd;font-size:14px;padding:52px 0 24px;}
.footer-inner{display:grid;grid-template-columns:1.4fr 2fr;gap:40px;}
.footer-brand .logo-text{color:#fff;}
.footer-slogan{margin-top:14px;color:#8f95a6;font-size:13.5px;max-width:320px;line-height:1.8;}
.qr-block{margin-top:22px;display:flex;align-items:center;gap:14px;}
.qr-box{
  width:88px;height:88px;flex:none;border-radius:10px;
  background:#fff;color:#7b8194;font-size:11px;text-align:center;
  display:grid;place-items:center;line-height:1.5;
}
.qr-tip{font-size:12.5px;color:#8f95a6;line-height:1.7;}
.footer-nav{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.footer-col h3{font-size:14px;color:#fff;margin-bottom:14px;}
.footer-col a{display:block;padding:5px 0;color:#8f95a6;font-size:13.5px;transition:color .16s;}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid #23262f;
  color:#767c8d;font-size:12.5px;line-height:1.9;
}
.footer-note{margin-top:4px;}

/* ===== 回顶部 ===== */
.to-top{
  position:fixed;right:20px;bottom:20px;z-index:40;
  width:42px;height:42px;border-radius:12px;
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);
  display:grid;place-items:center;color:var(--text-2);
  opacity:0;pointer-events:none;transition:.22s;
}
.to-top.is-show{opacity:1;pointer-events:auto;}
.to-top:hover{color:var(--brand);border-color:var(--brand);}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .footer-inner{grid-template-columns:1fr;gap:32px;}
}
@media (max-width:820px){
  .main-nav{
    display:none;position:absolute;top:var(--header-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;
    background:#fff;border-bottom:1px solid var(--line);
    padding:10px 20px 16px;box-shadow:var(--shadow);
  }
  .main-nav.is-open{display:flex;}
  .main-nav .nav-item{padding:11px 12px;font-size:15.5px;}
  .nav-toggle{display:block;}
  .header-actions .btn-ghost{display:none;}
  .hero-inner{padding:30px 20px 40px;}
  .hero-stats{gap:26px;}
  .hero-stats b{font-size:22px;}
  .section{padding:48px 0;}
  .cta-card{padding:26px;}
  .footer-nav{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:560px){
  .hide-sm{display:none;}
  .logo-sub{display:none;}
  .cat-grid,.tool-grid{grid-template-columns:1fr;}
  .filter-row{flex-direction:column;align-items:flex-start;gap:8px;}
  .hero-stats{gap:20px;}
  .rank-desc{display:none;}
  .btn{height:36px;padding:0 14px;font-size:13.5px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
}

/* ===== 子主题补充：服务端直出卡片的显隐由 [hidden] 控制 ===== */
[hidden]{display:none!important;}
.tool-logo{object-fit:cover;}

.list-meta{margin:0 0 14px;font-size:14px;color:var(--muted);}
.list-meta b{color:var(--brand);font-size:16px;}

/* ===== 卡片标题进内页 ===== */
.tool-name a{transition:color .16s;}
.tool-card:hover .tool-name a{color:var(--brand);}
.go-link.go-out{color:var(--muted);}
.go-link.go-out:hover{color:var(--accent);background:var(--bg-soft);}

/* ===== 工具详情页 ===== */
.detail-hero{
  background:
    radial-gradient(800px 320px at 10% -20%,rgba(79,70,229,.12),transparent 60%),
    var(--bg-soft);
  border-bottom:1px solid var(--line);
  padding:28px 0 32px;
}
.detail-top{
  display:grid;grid-template-columns:auto 1fr auto;
  gap:20px;align-items:start;margin-top:18px;
}
.detail-logo{
  width:64px;height:64px;border-radius:16px;flex:none;
  background:linear-gradient(135deg,var(--brand),#7c73f0);
  color:#fff;font-size:28px;font-weight:700;display:grid;place-items:center;
  box-shadow:0 6px 18px rgba(79,70,229,.25);
}
.detail-head-main{min-width:0;}
.detail-title{font-size:clamp(24px,3.4vw,34px);font-weight:800;letter-spacing:-.02em;}
.detail-badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px;}
.badge-scene{background:var(--brand-50);color:var(--brand);}
.detail-desc{margin-top:12px;color:var(--text-2);font-size:15.5px;max-width:760px;}
.detail-score{
  text-align:center;padding:14px 18px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius-sm);box-shadow:var(--shadow);
}
.detail-score-num{display:block;font-size:30px;font-weight:800;color:var(--brand);line-height:1.1;}
.detail-score .stars{font-size:14px;}
.detail-score-tip{display:block;margin-top:4px;font-size:12px;color:var(--muted);}
.detail-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px;}

.detail-layout{display:grid;grid-template-columns:1fr 300px;gap:32px;align-items:start;}
.detail-h2{
  font-size:19px;margin:0 0 14px;padding-left:12px;
  border-left:4px solid var(--brand);
}
.detail-content{font-size:15.5px;color:var(--text-2);line-height:1.9;}
.detail-content p{margin:0 0 14px;}
.detail-content h3{font-size:16px;margin:22px 0 10px;color:var(--text);}
.detail-content ul{margin:0 0 14px;padding-left:20px;list-style:disc;}
.detail-content li{margin:4px 0;}
.detail-content a{color:var(--brand);text-decoration:underline;}
.detail-empty{color:var(--muted);}
.detail-empty a{color:var(--brand);text-decoration:underline;}

.detail-scene-list{display:grid;gap:10px;margin-top:4px;}
.detail-scene-list li{
  padding:12px 16px;background:var(--bg-soft);
  border-radius:var(--radius-sm);font-size:14.5px;color:var(--text-2);
}
.detail-scene-list b{color:var(--text);margin-right:6px;}

.side-card{
  padding:20px;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);position:sticky;top:calc(var(--header-h) + 16px);
}
.side-title{font-size:15px;margin-bottom:14px;}
.side-list{display:grid;gap:12px;margin:0;}
.side-list div{display:flex;justify-content:space-between;gap:12px;font-size:14px;}
.side-list dt{color:var(--muted);flex:none;}
.side-list dd{margin:0;text-align:right;word-break:break-all;}
.side-list a{color:var(--brand);}
.side-note{margin-top:16px;padding-top:12px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--muted);line-height:1.7;}

@media (max-width:900px){
  .detail-layout{grid-template-columns:1fr;}
  .detail-top{grid-template-columns:auto 1fr;}
  .detail-score{grid-column:1 / -1;justify-self:start;}
  .side-card{position:static;}
}
@media (max-width:560px){
  .detail-top{grid-template-columns:1fr;}
  .detail-logo{width:52px;height:52px;font-size:22px;}
}