:root{--bg:#f6f7fb;--card:#fff;--ink:#111827;--muted:#6b7280;--brand:#7c3aed;--brand2:#a855f7;--border:#e5e7eb;--soft:#eef2ff}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
a{color:var(--brand);text-decoration:none}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.site{background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
header.site .wrap{display:flex;align-items:center;gap:24px;height:60px}.logo{font-weight:800;font-size:20px;color:var(--ink)}
.logo i{font-style:normal;color:var(--brand)}nav.main{margin-left:auto;display:flex;gap:16px;flex-wrap:wrap}
nav.main a{color:var(--muted);font-weight:500}nav.main a:hover{color:var(--brand)}main{padding:32px 0 56px}
.hero{text-align:center;padding:36px 16px 10px}.hero h1{font-size:32px;margin:0 0 10px}.hero p{color:var(--muted);font-size:17px;margin:0}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:18px 20px}
.card h2{font-size:18px;margin:0 0 10px}.card ul{list-style:none;margin:0;padding:0;columns:2;column-gap:14px}.card li{margin:4px 0;break-inside:avoid}
.crumb{font-size:13px;color:var(--muted);margin-bottom:12px}.crumb a{color:var(--muted)}
.tool-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:26px;margin:18px 0;box-shadow:0 1px 3px rgba(17,24,39,.05)}
.tool-card h1{margin:0 0 6px;font-size:26px}.tool-card .lead{color:var(--muted);margin:0 0 18px}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:14px}
.col label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:5px}
.t-in{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:8px;font-size:15px;background:#fff;color:var(--ink)}
.t-in:focus{outline:2px solid var(--brand)}textarea.t-in{min-height:150px;resize:vertical}textarea.tall{min-height:180px}
.mono{font-family:ui-monospace,Consolas,monospace}
.btn{display:inline-block;padding:11px 22px;border:0;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-size:15px;font-weight:600;cursor:pointer;margin-right:8px;margin-bottom:8px}
.btn2{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.result{background:var(--soft);border:1px solid #dbe3ff;border-radius:8px;padding:14px 16px;font-size:15px;margin-top:12px}
.result b{color:var(--brand)}.timer{font-size:56px;font-weight:800;text-align:center;margin:10px 0 20px}
.swatch{width:100%;height:60px;border-radius:8px;border:1px solid var(--border);margin:12px 0 0;display:flex;align-items:center;justify-content:center;font-weight:700}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin-top:14px}
.stat{background:var(--soft);border-radius:8px;padding:10px;text-align:center;font-size:13px;color:var(--muted)}
.stat b{display:block;font-size:20px;color:var(--ink)}.tbl{width:100%;border-collapse:collapse;margin-top:14px;font-size:14px}
.tbl th,.tbl td{border:1px solid var(--border);padding:7px 10px;text-align:left}.diffrow td{background:#fee2e2}
.note{background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:12px 14px;font-size:14px;color:#b45309;margin:14px 0}
.step,.show{margin-bottom:18px}.step h3{font-size:16px;margin:14px 0 8px}.small{font-size:13px;color:var(--muted);margin-top:8px}
.info{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px;margin:18px 0}.info p{margin:0 0 14px;color:#374151}
.faq{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px;margin:18px 0}
details{border:1px solid var(--border);border-radius:8px;padding:12px 16px;margin:8px 0;background:#fff}summary{font-weight:600;cursor:pointer}
.chips a{display:inline-block;background:var(--soft);color:var(--brand);border-radius:20px;padding:6px 14px;margin:4px 6px 4px 0;font-size:14px}
footer.site{background:var(--card);border-top:1px solid var(--border);padding:26px 0;color:var(--muted);font-size:14px;margin-top:40px}
footer.site .wrap{display:flex;flex-wrap:wrap;gap:18px;align-items:center}footer.site .copy{margin-left:auto}
@media(max-width:800px){.grid{grid-template-columns:repeat(2,1fr)}.hero h1{font-size:26px}.timer{font-size:40px}}
@media(max-width:520px){.grid{grid-template-columns:1fr}nav.main{gap:10px;font-size:14px}}