:root{
  --bg:#f6f8f8;--surface:#fff;--text:#0f172a;--muted:#5b6b7c;--border:#dde5ea;
  --primary:#0f766e;--primary-2:#2563eb;--on-primary:#fff;--soft:#e6f4f2;--danger:#dc2626;
  --shadow:0 10px 30px rgba(15,23,42,.08);--radius:16px;
}
:root[data-theme="dark"]{
  --bg:#0a1114;--surface:#121b20;--text:#e7eef2;--muted:#93a4b3;--border:#223039;
  --primary:#2dd4bf;--primary-2:#60a5fa;--on-primary:#04201d;--soft:#12292b;--danger:#f87171;
  --shadow:0 10px 30px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
.wrap{width:min(1040px,100% - 32px);margin-inline:auto}
a{color:var(--primary)}

.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--text);text-decoration:none;flex:none}
.logo{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:var(--on-primary);font-weight:800}
.nav{display:flex;align-items:center;gap:6px;overflow-x:auto;white-space:nowrap;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{color:var(--muted);text-decoration:none;font-weight:500;font-size:.93rem;padding:8px 12px;border-radius:8px}
.nav a:hover{color:var(--text);background:var(--soft)}
.nav a[aria-current="page"]{color:var(--primary);background:var(--soft);font-weight:600}
.icon-btn{flex:none;display:grid;place-items:center;width:38px;height:38px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;font-size:1.05rem}

.hero{padding:56px 0 30px;text-align:center;background:radial-gradient(60% 80% at 50% 0%,color-mix(in srgb,var(--primary) 16%,transparent),transparent)}
.hero.small{padding:40px 0 20px}
.eyebrow{display:inline-block;margin:0 0 14px;padding:6px 14px;border-radius:999px;background:var(--soft);color:var(--primary);font-weight:600;font-size:.78rem;letter-spacing:.05em;text-transform:uppercase}
h1{margin:0 0 12px;font-size:clamp(1.9rem,5vw,3rem);line-height:1.12;letter-spacing:-.02em}
h2{font-size:1.5rem;margin:0 0 16px;letter-spacing:-.01em}
h3{margin:0 0 6px;font-size:1.05rem}
.lead{max-width:640px;margin:0 auto;color:var(--muted);font-size:1.08rem}
main section{margin-block:28px}

.tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}
.tool{display:block;padding:22px;border:1px solid var(--border);border-radius:14px;background:var(--surface);color:var(--text);text-decoration:none;transition:transform .12s,border-color .12s,box-shadow .12s}
.tool:hover{transform:translateY(-2px);border-color:var(--primary);box-shadow:var(--shadow)}
.tool .ico{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--soft);color:var(--primary);font-weight:800;font-size:1.1rem;margin-bottom:12px}
.tool p{margin:0;color:var(--muted);font-size:.95rem}

.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.calc h3{margin-bottom:14px}
.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.row span{color:var(--muted);font-size:.95rem}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
label{font-weight:600;font-size:.9rem}
.opt{font-weight:400;color:var(--muted)}
input[type=number],input[type=date],input[type=time],select{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text);font:inherit}
.row input[type=number]{width:130px;flex:1 1 110px}
select{cursor:pointer}
input:focus-visible,button:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 45%,transparent);outline-offset:2px}

.out{margin-top:14px;padding:16px;border-radius:12px;background:var(--soft)}
.out .big{font-size:clamp(1.3rem,3.4vw,1.8rem);font-weight:800;color:var(--primary);letter-spacing:-.01em;word-break:break-word}
.out .sub{color:var(--muted);font-size:.9rem;margin-top:2px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:16px}
.stat{padding:14px;border-radius:12px;background:var(--surface);border:1px solid var(--border)}
.stat b{display:block;font-size:1.2rem;word-break:break-word}
.stat span{color:var(--muted);font-size:.82rem}
.stat.accent b{color:var(--primary)}

.btn{padding:12px 20px;border:0;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:var(--on-primary);font:inherit;font-weight:700;cursor:pointer}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 14px}
.chip{padding:7px 14px;border:1px solid var(--border);border-radius:999px;background:var(--bg);color:var(--text);font:inherit;font-size:.85rem;cursor:pointer}
.chip:hover,.chip.active{border-color:var(--primary);color:var(--primary);background:var(--soft)}
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.tabs .chip{padding:9px 16px;font-weight:600}
.two{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:end}
.swap{height:46px;width:46px;padding:0;font-size:1.1rem}
.note{color:var(--muted);font-size:.9rem;margin:10px 0 0}
.status{display:inline-block;margin-top:10px;font-size:.85rem;color:var(--muted)}
.error{color:var(--danger);font-weight:500}

.tbl-wrap{overflow-x:auto;margin-top:16px;border:1px solid var(--border);border-radius:12px}
table{width:100%;border-collapse:collapse;background:var(--surface);font-size:.95rem}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}
th{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:var(--bg)}
tr:last-child td{border-bottom:0}
td.time{font-weight:800;font-size:1.05rem}
tr.src td{background:var(--soft)}
.rm{border:0;background:none;color:var(--muted);cursor:pointer;font-size:1.1rem;padding:2px 8px;border-radius:6px}
.rm:hover{color:var(--danger)}

.prose{max-width:760px}
.prose p,.prose li{color:var(--muted)}
.prose h2{margin-top:28px}
details{border:1px solid var(--border);border-radius:12px;background:var(--surface);margin-bottom:10px;padding:0 18px}
summary{cursor:pointer;padding:15px 0;font-weight:600}
details p{margin:0 0 15px;color:var(--muted)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.site-footer{border-top:1px solid var(--border);margin-top:56px;padding:28px 0;color:var(--muted);text-align:center;font-size:.9rem}
.site-footer p{margin:0}
.site-footer a{color:var(--primary);text-decoration:none;font-weight:500}
.site-footer a:hover{text-decoration:underline}

@media (max-width:640px){
  .header-inner{flex-wrap:wrap;padding-block:8px}
  .nav{width:100%;order:3}
  .hero{padding:40px 0 22px}
  .two{grid-template-columns:1fr}
  .swap{width:100%}
  .card{padding:18px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}