:root{
  --bg:#0b1220; --surface:#111c31; --text:#e9eef7; --muted:#93a4bd; --line:rgba(140,170,220,.16);
  --accent:#ff7a1a; --accent-soft:rgba(255,122,26,.14); --todo:#5a4a00; --warn:#ffb36b;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background-image:linear-gradient(rgba(140,170,220,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(140,170,220,.05) 1px,transparent 1px);background-size:44px 44px;background-attachment:fixed;font-family:Inter,system-ui,sans-serif;background-color:var(--bg);color:var(--text);line-height:1.6;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1000px;margin:0 auto;padding:0 20px}
mark.todo{background:var(--todo);color:inherit;padding:0 3px;border-radius:3px}

nav{position:sticky;top:0;z-index:10;background:rgba(11,18,32,.85);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;justify-content:space-between;align-items:center;height:60px}
nav .logo{font-weight:600;color:var(--text);font-family:"Space Grotesk",Inter,sans-serif;display:flex;align-items:center;gap:10px}
nav .logo:before{content:"AA";width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,#ff7a1a,#ff4d4d);display:grid;place-items:center;font-size:13px;font-weight:700;color:#fff}
nav .logo:hover{text-decoration:none}
nav ul{display:flex;gap:22px;list-style:none;font-size:14px}
nav ul a{color:var(--muted)}

header.page{padding:48px 0 24px}
.crumb{font-size:14px;color:var(--muted)}
h1{font-family:"Space Grotesk",Inter,sans-serif;font-size:clamp(28px,5vw,40px);line-height:1.15;margin:8px 0 10px;letter-spacing:-.02em}
.lead{color:var(--muted);max-width:680px}
h2{font-size:20px;margin-bottom:12px}

.calc{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0 48px}
@media (max-width:780px){.calc{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:22px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:12px}
.row.three{grid-template-columns:1fr 1fr 1fr}
@media (max-width:480px){.row,.row.three{grid-template-columns:1fr 1fr}}
label{display:block;font-size:13px;font-weight:600;margin-bottom:4px}
label small{font-weight:400;color:var(--muted)}
input,select{width:100%;padding:9px 10px;font:inherit;font-size:15px;border:1px solid var(--line);border-radius:7px;background:var(--bg);color:var(--text)}
input:focus,select:focus{outline:2px solid var(--accent);outline-offset:-1px}
.hint{font-size:13px;color:var(--muted);margin-top:-4px;margin-bottom:12px}
.btn{display:inline-block;padding:8px 14px;border-radius:7px;font:inherit;font-size:14px;font-weight:600;border:1px solid var(--line);background:var(--surface);color:var(--text);cursor:pointer}
.btn:hover{border-color:var(--accent)}
.btn.small{padding:4px 10px;font-size:13px}

.result{background:var(--accent-soft);border-radius:10px;padding:18px;margin-bottom:16px}
.result .big{font-family:"Space Grotesk",Inter,sans-serif;font-size:34px;font-weight:700;color:var(--accent);line-height:1.2}
.result .label{font-size:13px;color:var(--muted)}
.err{color:var(--warn);font-size:14px;font-weight:500}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:right;padding:6px 8px;border-bottom:1px solid var(--line);font-variant-numeric:tabular-nums}
th:first-child,td:first-child{text-align:left}
th{color:var(--muted);font-weight:600}

.notes{margin-bottom:48px}
.notes ul{padding-left:20px;color:var(--muted)}
.notes li{margin-bottom:6px}
code{font-family:"JetBrains Mono",monospace;font-size:13px;background:var(--accent-soft);padding:1px 5px;border-radius:4px}

.tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin:24px 0 64px}
.tool{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:22px;color:var(--text);display:block}
.tool:hover{border-color:var(--accent);text-decoration:none}
.tool h3{font-size:18px;margin-bottom:6px}
.tool p{color:var(--muted);font-size:15px}
.tool .go{color:var(--accent);font-weight:600;font-size:14px;margin-top:10px;display:block}
.tool.soon{opacity:.6;pointer-events:none}

svg text{font-family:Inter,system-ui,sans-serif}
footer{padding:32px 0;color:var(--muted);font-size:14px;text-align:center;border-top:1px solid var(--line)}