:root{
  --ink:#1e293b; --muted:#64748b; --line:#e2e8f0; --bg:#f8fafc; --card:#ffffff;
  --brand:#4f46e5; --brand-d:#4338ca; --ok:#16a34a; --warn:#d97706; --bad:#dc2626;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;font-size:16px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
main.wrap{max-width:780px}
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.header-in{display:flex;justify-content:space-between;align-items:center;height:60px}
.brand{font-weight:800;font-size:20px;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:8px}
.brand-mark{display:inline-flex;width:28px;height:28px;border-radius:8px;background:var(--brand);color:#fff;
  align-items:center;justify-content:center;font-size:16px}
.site-header nav a{color:var(--muted);text-decoration:none;font-weight:600}
.site-header nav a:hover{color:var(--brand)}
main{padding:36px 20px 60px}
h1{font-size:32px;line-height:1.25;margin-bottom:8px;letter-spacing:-.5px}
.tagline{color:var(--muted);font-size:18px;margin-bottom:28px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;margin-bottom:32px;
  box-shadow:0 1px 3px rgba(0,0,0,.04)}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;margin-bottom:6px;font-size:14px}
.field input[type=text],.field input[type=number],.field input[type=date],
.field input[type=datetime-local],.field textarea,.field select{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-size:16px;
  font-family:inherit;background:#fff;color:var(--ink)}
.field textarea{min-height:130px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row .field{flex:1;min-width:140px}
.btn{display:inline-block;background:var(--brand);color:#fff;border:none;border-radius:10px;
  padding:12px 26px;font-size:16px;font-weight:700;cursor:pointer;font-family:inherit}
.btn:hover{background:var(--brand-d)}
.btn.ghost{background:#eef2ff;color:var(--brand)}
.btn.ghost:hover{background:#e0e7ff}
.btn.ghost.on{background:var(--brand);color:#fff}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin:6px 0 4px}
.result{background:#f1f5f9;border:1px dashed #cbd5e1;border-radius:10px;padding:18px;margin-top:18px;
  font-size:15px;word-break:break-word}
.result:empty{display:none}
.result .big{font-size:30px;font-weight:800;color:var(--brand)}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-top:16px}
.stat{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px;text-align:center}
.stat b{display:block;font-size:24px;color:var(--brand)}
.stat span{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.4px}
.seg{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.seg button{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:8px 18px;
  font-size:14px;font-weight:600;cursor:pointer;color:var(--muted)}
.seg button.on{background:var(--brand);border-color:var(--brand);color:#fff}
.copybtn{margin-top:10px}
pre.out{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:16px;overflow:auto;
  font-size:13.5px;margin-top:14px;max-height:320px}
.swatch{width:100%;height:90px;border-radius:10px;border:1px solid var(--line);margin-top:12px}
input[type=range]{width:100%;accent-color:var(--brand)}
input[type=color]{width:56px;height:42px;border:1px solid var(--line);border-radius:8px;padding:2px;background:#fff}
input[type=checkbox]{width:18px;height:18px;accent-color:var(--brand)}
.check{display:flex;align-items:center;gap:8px;margin:8px 0;font-size:15px}
section.block{margin:34px 0}
section.block h2{font-size:22px;margin-bottom:12px}
section.block ol,section.block ul{padding-left:22px;color:#334155}
section.block li{margin-bottom:8px}
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:14px 4px}
.faq summary{font-weight:700;cursor:pointer}
.faq summary:hover{color:var(--brand)}
.faq p{color:#475569;margin-top:8px;font-size:15px}
.disclaimer{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:14px 18px;
  font-size:14px;color:#92400e;margin:24px 0}
.privacy-badge{display:inline-flex;align-items:center;gap:8px;background:#f0fdf4;color:#166534;
  border:1px solid #bbf7d0;border-radius:999px;padding:8px 16px;font-size:13.5px;font-weight:600;margin-bottom:20px}
/* landing */
.hero{text-align:center;padding:44px 0 30px}
.hero h1{font-size:40px}
.hero p{color:var(--muted);font-size:18px;max-width:620px;margin:10px auto 0}
.cat{margin:36px 0}
.cat h2{font-size:20px;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.cat h2 .n{background:#eef2ff;color:var(--brand);font-size:13px;border-radius:999px;padding:2px 12px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.tcard{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;text-decoration:none;
  color:var(--ink);transition:transform .12s,box-shadow .12s;display:block}
.tcard:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(79,70,229,.10);border-color:#c7d2fe}
.tcard .ic{font-size:26px}
.tcard h3{font-size:16px;margin:8px 0 4px}
.tcard p{font-size:13.5px;color:var(--muted);line-height:1.5}
.about{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px;margin:40px 0}
.about h2{font-size:22px;margin-bottom:10px}
.about p{color:#475569;margin-bottom:10px;font-size:15.5px}
.site-footer{border-top:1px solid var(--line);background:#fff;margin-top:20px}
.footer-in{padding:32px 20px;text-align:center}
.fbrand{font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center;gap:8px}
.fnote{color:var(--muted);font-size:14px;margin:10px 0}
.flinks{display:flex;gap:20px;justify-content:center;margin:12px 0}
.flinks a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:600}
.flinks a:hover{color:var(--brand)}
.fcopy{color:#94a3b8;font-size:13px}
.legal h1{margin-bottom:16px}
.legal p,.legal li{color:#475569;font-size:15.5px;margin-bottom:12px}
.legal ul{padding-left:22px}
@media(max-width:640px){h1{font-size:26px}.hero h1{font-size:32px}.tool-card{padding:20px}}

.brand-logo{width:32px;height:32px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-slogan{font-size:11px;font-weight:600;color:var(--brand);letter-spacing:.2px;white-space:nowrap}
.fbrand .brand-logo{width:26px;height:26px}