/* 5l5l Tools Design System 2026 — Linear/Vercel-inspired, light+dark auto */
/* 首页搜索/空态用 hidden 属性隐藏元素；.tool-card/.cat-tile 等有 display:flex，
   作者样式会覆盖 UA 的 [hidden]{display:none}，必须显式声明且加 !important。 */
[hidden]{display:none !important}
:root{
  --bg:#FAFAFB; --surface:#FFFFFF; --surface-2:#F4F4F6; --border:#E4E4E9;
  --text:#18181B; --muted:#64646E;
  --primary:#4F46E5; --primary-soft:#EEF0FE;
  --grad-a:#4F46E5; --grad-b:#7C3AED;
  --dot:rgba(24,24,27,.05); --ring:rgba(99,102,241,.28);
  --shadow-sm:0 1px 2px rgba(24,24,27,.04);
  --shadow-md:0 4px 16px -4px rgba(24,24,27,.08),0 1px 3px rgba(24,24,27,.05);
  --shadow-lg:0 12px 32px -8px rgba(79,70,229,.16),0 2px 8px rgba(24,24,27,.05);
  --header-bg:rgba(250,250,251,.82);
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0B0B0F; --surface:#15151B; --surface-2:#1D1D26; --border:#2A2A35;
    --text:#F4F4F5; --muted:#A1A1AB;
    --primary:#818CF8; --primary-soft:rgba(99,102,241,.14);
    --dot:rgba(244,244,245,.06); --ring:rgba(129,140,248,.35);
    --shadow-sm:0 1px 2px rgba(0,0,0,.3);
    --shadow-md:0 4px 16px -4px rgba(0,0,0,.45),0 1px 3px rgba(0,0,0,.3);
    --shadow-lg:0 12px 32px -8px rgba(0,0,0,.55),0 2px 8px rgba(0,0,0,.35);
    --header-bg:rgba(11,11,15,.78);
  }
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Inter","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  background-image:radial-gradient(circle at 1px 1px,var(--dot) 1px,transparent 0);
  background-size:26px 26px;
}
body::before{
  content:"";position:fixed;inset:0 0 auto 0;height:420px;pointer-events:none;z-index:0;
  background:radial-gradient(640px 320px at 50% -60px,var(--ring),transparent 70%);
  opacity:.55;
}
::selection{background:var(--primary);color:#fff}
a{color:var(--primary);text-decoration:none;transition:opacity .15s}
a:hover{opacity:.82}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}
.container{max-width:980px;margin:0 auto;padding:0 20px;position:relative;z-index:1}
/* ---- sticky glass header ---- */
header.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--header-bg);
  -webkit-backdrop-filter:saturate(180%) blur(14px);backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--border);
  padding:12px 0;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.brand{font-size:17px;font-weight:700;color:var(--text);display:inline-flex;align-items:center;gap:9px;letter-spacing:-.01em}
.brand::before{content:"";width:22px;height:22px;border-radius:7px;flex:0 0 auto;
  background:linear-gradient(135deg,var(--grad-a),var(--grad-b));
  box-shadow:0 2px 6px rgba(79,70,229,.4)}
.brand span{color:var(--muted);font-weight:500;font-size:13px;margin-left:2px}
.lang-switch{
  border:1px solid var(--border);background:var(--surface);color:var(--text);
  padding:6px 14px;border-radius:999px;font-size:13px;font-weight:500;
  box-shadow:var(--shadow-sm);transition:border-color .15s,background .15s,transform .15s;
}
.lang-switch:hover{border-color:var(--primary);opacity:1;transform:translateY(-1px)}
main{padding:36px 0 48px}
/* ---- hero ---- */
.hero{text-align:center;padding:20px 0 30px}
.hero-badge{
  display:inline-flex;align-items:center;gap:7px;
  font-size:13px;font-weight:500;color:var(--muted);
  background:var(--surface);border:1px solid var(--border);border-radius:999px;
  padding:6px 16px;margin-bottom:18px;box-shadow:var(--shadow-sm);
}
.hero-badge::before{content:"";width:7px;height:7px;border-radius:50%;
  background:linear-gradient(135deg,var(--grad-a),var(--grad-b));
  box-shadow:0 0 0 3px var(--primary-soft)}
.hero h1{
  font-size:clamp(30px,5vw,42px);font-weight:800;letter-spacing:-.03em;line-height:1.15;
  margin-bottom:10px;
}
.hero h1 span{
  background:linear-gradient(92deg,var(--grad-a),var(--grad-b));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{color:var(--muted);max-width:620px;margin:0 auto;font-size:16px}
/* ---- tool shell ---- */
.tool-shell{
  background:var(--surface);border:1px solid var(--border);border-radius:18px;
  padding:28px;margin:24px 0;box-shadow:var(--shadow-lg);
}
.tool-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:20px;background:var(--surface-2);border-radius:12px;padding:4px}
.tool-tabs button{
  border:none;background:transparent;padding:8px 18px;border-radius:9px;cursor:pointer;
  font-size:14px;font-weight:500;color:var(--muted);transition:all .18s;font-family:inherit;
}
.tool-tabs button:hover{color:var(--text)}
.tool-tabs button.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm);font-weight:600}
.tool-panel{display:none}
.tool-panel.active{display:block;animation:fadein .25s ease}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
/* ---- forms ---- */
.form-row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end;margin-bottom:16px}
.form-group{display:flex;flex-direction:column;gap:6px;flex:1;min-width:140px}
.form-group label{font-size:13px;font-weight:500;color:var(--muted)}
.form-group input,.form-group select,.form-group textarea{
  padding:10px 12px;border:1px solid var(--border);border-radius:10px;font-size:15px;
  background:var(--surface-2);color:var(--text);width:100%;font-family:inherit;
  transition:border-color .15s,box-shadow .15s,background .15s;
}
.form-group input:hover,.form-group select:hover,.form-group textarea:hover{border-color:var(--muted)}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  outline:none;border-color:var(--primary);background:var(--surface);
  box-shadow:0 0 0 3px var(--ring);
}
.form-group textarea{resize:vertical;line-height:1.6}
.checkline{display:inline-flex;align-items:center;gap:7px;font-size:14px;color:var(--muted);cursor:pointer;transition:color .15s}
.checkline:hover{color:var(--text)}
.checkline input{width:auto;accent-color:var(--primary)}
/* ---- buttons ---- */
button.primary-btn{
  background:linear-gradient(135deg,var(--grad-a),var(--grad-b));color:#fff;border:none;
  padding:11px 24px;border-radius:10px;cursor:pointer;font-size:15px;font-weight:600;font-family:inherit;
  box-shadow:0 4px 12px -2px rgba(79,70,229,.4);
  transition:transform .15s,box-shadow .15s,filter .15s;
}
button.primary-btn:hover{transform:translateY(-1px);box-shadow:0 8px 20px -4px rgba(79,70,229,.5);filter:brightness(1.06);opacity:1}
button.primary-btn:active{transform:translateY(0) scale(.98)}
button.secondary-btn{
  background:var(--surface);color:var(--primary);border:1px solid var(--border);
  padding:10px 18px;border-radius:10px;cursor:pointer;font-size:14px;font-weight:500;font-family:inherit;
  transition:border-color .15s,background .15s,transform .15s;
}
button.secondary-btn:hover{border-color:var(--primary);background:var(--primary-soft);transform:translateY(-1px);opacity:1}
button.secondary-btn:active{transform:scale(.98)}
/* ---- results ---- */
.result-label{font-size:13px;font-weight:500;color:var(--muted);margin-bottom:8px;text-transform:uppercase;letter-spacing:.04em}
.result-unit{color:var(--muted);margin-left:4px;font-size:.85em}
.result-box{
  background:var(--surface-2);border:1px solid var(--border);border-radius:12px;
  padding:18px;margin-top:16px;font-size:16px;
}
.result-box .big{
  font-size:clamp(24px,4vw,30px);font-weight:800;letter-spacing:-.02em;
  background:linear-gradient(92deg,var(--grad-a),var(--grad-b));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.result-box textarea{
  width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;font-size:14px;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;resize:vertical;line-height:1.6;
  background:var(--surface);color:var(--text);
}
.result-box textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--ring)}
.result-box .secondary-btn{margin-top:12px}
.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-top:14px}
.result-item{
  background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 14px;
  transition:border-color .15s,box-shadow .15s;
}
.result-item:hover{border-color:var(--primary);box-shadow:var(--shadow-sm)}
.result-item .label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.result-item .value{font-size:19px;font-weight:700;color:var(--primary);margin-top:2px}
table.detail{width:100%;border-collapse:separate;border-spacing:0;margin-top:16px;font-size:14px;border:1px solid var(--border);border-radius:10px;overflow:hidden}
table.detail th,table.detail td{border-bottom:1px solid var(--border);padding:9px 12px;text-align:right}
table.detail tr:last-child td{border-bottom:none}
table.detail th{background:var(--surface-2);color:var(--muted);font-weight:600;font-size:13px}
table.detail td:first-child,table.detail th:first-child{text-align:left}
/* ---- preview / password / batch ---- */
.preview-wrap{text-align:center;margin-bottom:16px}
.preview-wrap img{max-width:100%;max-height:320px;border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-md)}
.pwd-list{display:flex;flex-direction:column;gap:8px}
.pwd-item{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:15px;
  background:var(--surface-2);border:1px solid var(--border);border-radius:10px;
  padding:11px 14px;cursor:pointer;word-break:break-all;
  transition:border-color .15s,background .15s,transform .15s;
}
.pwd-item:hover{border-color:var(--primary);background:var(--primary-soft);transform:translateY(-1px)}
.pwd-item.copied{background:rgba(46,125,50,.12);border-color:#2E7D32}
.strength-bar{height:10px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;overflow:hidden;margin-bottom:14px}
.strength-fill{height:100%;width:0;background:var(--muted);border-radius:999px;transition:width .35s cubic-bezier(.22,1,.36,1)}
.strength-fill.lv0{background:#EF4444}
.strength-fill.lv1{background:#F97316}
.strength-fill.lv2{background:#F59E0B}
.strength-fill.lv3{background:#84CC16}
.strength-fill.lv4{background:#22C55E}
.strength-tips{margin-top:12px}
.strength-tips p{font-size:14px;color:var(--muted);margin-top:4px}
.batch-list{display:flex;flex-direction:column;gap:6px;max-height:360px;overflow:auto}
.batch-row{
  display:flex;justify-content:space-between;gap:12px;padding:9px 12px;
  background:var(--surface-2);border:1px solid var(--border);border-radius:10px;font-size:14px;
}
.batch-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.batch-status{color:var(--muted);white-space:nowrap}
/* ---- content sections ---- */
.content-section{margin:40px 0}
.content-section h2{
  font-size:22px;font-weight:700;letter-spacing:-.02em;margin-bottom:16px;
  display:flex;align-items:center;gap:10px;
}
.content-section h2::before{content:"";width:4px;height:20px;border-radius:2px;background:linear-gradient(180deg,var(--grad-a),var(--grad-b))}
.guide-list{list-style:none;display:grid;gap:12px;counter-reset:guide}
.guide-list li{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:16px 18px;box-shadow:var(--shadow-sm);transition:border-color .15s,box-shadow .15s;
}
.guide-list li:hover{border-color:var(--primary);box-shadow:var(--shadow-md)}
.guide-list strong{color:var(--primary)}
.guide-list p{color:var(--muted);font-size:14px;margin-top:4px}
.faq-section{display:grid;gap:14px}
.faq-section h3{font-size:16px;font-weight:600}
.faq-section p{color:var(--muted);font-size:14px}
/* ---- related tools ---- */
.related-tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.tool-card{
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:16px;display:flex;flex-direction:column;gap:4px;position:relative;
  box-shadow:var(--shadow-sm);
  transition:border-color .18s,box-shadow .18s,transform .18s;
}
.tool-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md);transform:translateY(-3px);opacity:1}
.tool-card::after{
  content:"→";position:absolute;top:14px;right:16px;font-size:15px;color:var(--muted);
  transition:transform .18s,color .18s;
}
.tool-card:hover::after{transform:translateX(3px);color:var(--primary)}
.tool-card-name{font-weight:700;color:var(--primary)}
.tool-card-desc{font-size:13px;color:var(--muted);padding-right:20px}
/* ---- footer ---- */
footer.site-footer{border-top:1px solid var(--border);padding:30px 0 26px;color:var(--muted);font-size:13px;text-align:center;background:var(--bg)}
.footer-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:12px}
.footer-nav a{color:var(--text);text-decoration:none;font-weight:500;font-size:13px}
.footer-nav a:hover{color:var(--primary);text-decoration:underline}
.footer-copy{font-size:12.5px;line-height:1.7}
.static-page{max-width:780px;padding:34px 0 10px}
.static-page h1{font-size:28px;margin:0 0 4px;letter-spacing:-.01em}
.static-page .lead{color:var(--muted);margin:0 0 4px;font-size:15px}
.static-page .updated{font-size:13px;color:var(--muted);margin:0 0 20px}
.static-page h2{font-size:19px;margin:26px 0 10px;padding-top:16px;border-top:1px solid var(--border)}
.static-page p,.static-page li{line-height:1.85;font-size:15px;color:var(--text)}
.static-page ul{padding-left:22px;margin:10px 0}
.static-page li{margin:5px 0}
.static-page a{color:var(--primary);text-decoration:none}
.static-page a:hover{text-decoration:underline}
@media (max-width:640px){.static-page{padding-top:22px}.static-page h1{font-size:24px}}
.result-grid.cols-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:640px){
  .hero h1{font-size:26px}
  .tool-shell{padding:18px;border-radius:14px}
  .form-group{min-width:100%}
  .result-grid{grid-template-columns:1fr 1fr}
  .result-grid.cols-4{grid-template-columns:1fr 1fr}
  body{background-size:20px 20px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* ============================================================
   Home / category / hub additions (100-tool directory)
   ============================================================ */
.hero-search{position:relative;max-width:560px;margin:24px auto 0}
.hero-search input{
  width:100%;padding:14px 18px 14px 48px;border:1px solid var(--border);border-radius:14px;
  font-size:16px;background:var(--surface);color:var(--text);font-family:inherit;
  box-shadow:var(--shadow-md);transition:border-color .15s,box-shadow .15s;
}
.hero-search input::placeholder{color:var(--muted)}
.hero-search input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--ring),var(--shadow-md)}
.hero-search .search-icon{
  position:absolute;left:17px;top:50%;transform:translateY(-50%);
  font-size:17px;color:var(--muted);pointer-events:none;line-height:1;
}
.search-empty{text-align:center;color:var(--muted);padding:40px 0;font-size:15px}

/* category tiles —— 固定 3 列，9 类正好 3×3，6 类 3×2 */
.cat-tiles{
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:34px 0 8px;
}
.cat-tile{
  display:flex;align-items:flex-start;gap:11px;padding:14px 15px;border-radius:13px;
  background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-sm);
  color:var(--text);font-size:14px;font-weight:600;
  transition:border-color .16s,transform .16s,box-shadow .16s;
}
.cat-tile:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-md);opacity:1}
.cat-tile .cat-emoji{
  font-size:19px;line-height:1.25;flex:0 0 auto;
  font-family:"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji",sans-serif;
}
.cat-tile .cat-text{display:flex;flex-direction:column;gap:2px;flex:1;min-width:0}
.cat-tile .cat-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cat-tile .cat-tip{
  font-size:12px;font-weight:400;color:var(--muted);line-height:1.45;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.cat-tile .cat-count{
  font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-soft);
  border-radius:999px;padding:2px 8px;flex:0 0 auto;margin-top:1px;
}

/* category section */
.cat-section{margin:38px 0}
.cat-section:first-of-type{margin-top:30px}
.cat-section-head{display:flex;align-items:center;gap:10px;margin-bottom:6px;flex-wrap:wrap}
.cat-section-head h2{
  font-size:20px;font-weight:700;letter-spacing:-.02em;display:flex;align-items:center;gap:9px;
}
.cat-section-head h2::before{
  content:"";width:4px;height:19px;border-radius:2px;
  background:linear-gradient(180deg,var(--grad-a),var(--grad-b));
}
.cat-section-head .cat-desc{font-size:13px;color:var(--muted);flex:1 1 100%;padding-left:13px}
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(224px,1fr));gap:12px;margin-top:14px}
.home-card{flex-direction:row;align-items:flex-start;gap:12px;padding:15px 16px}
.home-card .card-emoji{
  font-size:22px;line-height:1.35;flex:0 0 auto;width:26px;text-align:center;
  transition:transform .18s;
}
.home-card:hover .card-emoji{transform:scale(1.12)}
.home-card .card-body{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}
.home-card .tool-card-name{font-size:15px}
.home-card .tool-card-desc{padding-right:14px;line-height:1.5}

/* breadcrumb */
.breadcrumb{
  font-size:13px;color:var(--muted);margin-bottom:16px;
  display:flex;align-items:center;gap:7px;flex-wrap:wrap;
}
.breadcrumb a{color:var(--muted);transition:color .15s}
.breadcrumb a:hover{color:var(--primary);opacity:1}
.breadcrumb .sep{opacity:.5}
.breadcrumb .current{color:var(--text);font-weight:500}
.tool-cat-chip{
  display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:500;
  color:var(--primary);background:var(--primary-soft);border-radius:999px;padding:3px 11px;
  margin-bottom:12px;
}
/* hero emoji for tool page */
.hero-emoji{
  font-size:40px;line-height:1;display:block;margin-bottom:12px;
  filter:drop-shadow(0 6px 14px rgba(79,70,229,.18));
}
/* stats strip on home */
.hero-stats{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin-top:18px;color:var(--muted);font-size:13px}
.hero-stats b{color:var(--text);font-weight:700;font-size:15px;margin-right:4px}
/* section divider */
.section-divider{height:1px;background:var(--border);margin:32px 0;border:none}
@media (max-width:640px){
  .cat-tiles{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
  .home-grid{grid-template-columns:1fr}
  .hero-search input{font-size:15px;padding:12px 16px 12px 44px}
  .hero-emoji{font-size:34px}
}

/* emoji 统一字体栈，避免部分环境回退成豆腐块 */
.hero-emoji,.card-emoji,.cat-emoji,.cat-section-head h2,
.tool-card-name,.related-tools .tool-card-name{
  font-family:inherit,"Apple Color Emoji","Segoe UI Emoji","Noto Color Emoji";
}
/* 搜索框内联 SVG 图标 */
.hero-search .search-icon{display:flex;align-items:center;justify-content:center;width:20px;height:20px}
.hero-search .search-icon svg{display:block}
.hero-search input{padding-left:48px}
@media (max-width:760px){
  .cat-tiles{grid-template-columns:repeat(2,1fr)}
  .cat-tile{padding:12px 13px;gap:9px}
  .cat-tile .cat-tip{display:none}
  .hero-search input{padding-left:44px}
}