:root{--bg:#07090d;--card:#12151c;--line:#2a3140;--text:#e8ecf4;--muted:#9aa3b5;--dim:#6f778a;--teal:#1abc9c;--teal2:#16a085}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif}
a{color:var(--teal)}
header.top{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap;padding:14px 18px;border-bottom:1px solid var(--line);max-width:980px;margin:0 auto}
.mark{color:var(--teal);font-weight:800;letter-spacing:.14em;font-size:13px;text-decoration:none}
nav{display:flex;gap:8px;flex-wrap:wrap}
nav a{min-height:40px;display:inline-flex;align-items:center;padding:8px 12px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--text);font-weight:700;font-size:13px}
main{max-width:980px;margin:0 auto;padding:28px 18px 64px}
h1{font-size:clamp(28px,4vw,40px);line-height:1.15;margin:0 0 8px}
.lede{color:var(--muted);font-size:17px;line-height:1.5;max-width:62ch}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:22px 0}
.card,article.tool{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.card h2,article h2{margin:0 0 6px;font-size:18px}
.card p,article p{margin:0;color:var(--muted);line-height:1.45}
form.calc{display:grid;gap:10px;margin:16px 0}
label{display:grid;gap:4px;font-size:13px;font-weight:700;color:var(--muted)}
input,select,button{min-height:44px;border-radius:10px;border:1px solid var(--line);background:#0e1218;color:var(--text);padding:8px 10px;font-size:15px}
button,.btn{background:linear-gradient(180deg,var(--teal),var(--teal2));color:#041410;font-weight:800;border:0;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border-radius:10px}
.out{background:#0e1218;border:1px solid var(--line);border-radius:12px;padding:12px;font-variant-numeric:tabular-nums}
.out b{font-size:22px}
.err{color:#e74c3c;font-weight:700}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--dim);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.note,.disc{color:var(--dim);font-size:12px;line-height:1.45}
.faq details{border-bottom:1px solid var(--line);padding:10px 0}
.faq summary{cursor:pointer;font-weight:800;min-height:36px}
pre.prompt{white-space:pre-wrap;background:#0e1218;border:1px solid var(--line);border-radius:10px;padding:12px;font-size:13px;line-height:1.45}
.featured{border-color:#d4a017}
@media(max-width:640px){header.top{padding:12px}main{padding:20px 14px 72px}table{font-size:13px}}