:root {
  --bg: #0b0e14;
  --panel: #141926;
  --panel2: #1b2333;
  --fg: #e6edf3;
  --muted: #8b98a9;
  --accent: #4ade80;
  --accent2: #38bdf8;
  --border: #232c3d;
  --danger: #f87171;
  --radius: 12px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 70% -10%, #16243a 0%, var(--bg) 55%);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* nav */
nav.top { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.brand { font-weight: 800; font-size: 20px; letter-spacing: -0.02em; }
.brand .dot { color: var(--accent); }
nav.top .links a { color: var(--muted); margin-left: 22px; font-size: 15px; }
nav.top .links a:hover { color: var(--fg); }

/* hero */
.hero { text-align: center; padding: 70px 0 40px; }
.hero h1 { font-size: 52px; line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 16px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.sub { font-size: 21px; color: var(--muted); max-width: 640px; margin: 0 auto 28px; }
.cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn { display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 16px; cursor: pointer; border: 1px solid transparent; }
.btn.primary { background: var(--accent); color: #05210f; }
.btn.primary:hover { filter: brightness(1.08); text-decoration: none; }
.btn.ghost { background: transparent; border-color: var(--border); color: var(--fg); }
.btn.ghost:hover { border-color: var(--accent2); text-decoration: none; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* panels */
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.grid { display: grid; gap: 18px; }
.section { padding: 48px 0; }
.section h2 { font-size: 30px; letter-spacing: -0.02em; margin: 0 0 8px; }
.section .lead { color: var(--muted); margin: 0 0 26px; }

/* demo */
.demo textarea, .demo input, .field input, .field textarea {
  width: 100%; background: var(--panel2); color: var(--fg); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; font-family: var(--mono); font-size: 14px;
}
.demo .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 14px; }
.stat .b { background: var(--panel2); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.stat .b .k { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.stat .b .v { font-family: var(--mono); font-size: 19px; font-weight: 700; }
.stat .b .v.good { color: var(--accent); }
code, pre { font-family: var(--mono); }
pre { background: var(--panel2); border: 1px solid var(--border); border-radius: 10px; padding: 16px; overflow-x: auto; font-size: 14px; }

/* pricing */
.pricing { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.plan { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; }
.plan.pop { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.plan .name { font-weight: 700; font-size: 18px; }
.plan .price { font-size: 34px; font-weight: 800; margin: 10px 0 2px; }
.plan .price small { font-size: 15px; color: var(--muted); font-weight: 500; }
.plan .lim { color: var(--accent); font-family: var(--mono); margin: 6px 0 14px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 18px; color: var(--muted); font-size: 15px; }
.plan ul li { padding: 4px 0; }
.plan ul li::before { content: "✓ "; color: var(--accent); }
.plan .btn { margin-top: auto; text-align: center; }

/* billing toggle */
.toggle { display: inline-flex; gap: 4px; background: var(--panel2); border: 1px solid var(--border); border-radius: 999px; padding: 4px; margin: 0 0 22px; }
.toggle-btn { border: none; background: transparent; color: var(--muted); font: inherit; font-size: 14px; font-weight: 600; padding: 7px 16px; border-radius: 999px; cursor: pointer; }
.toggle-btn.active { background: var(--accent); color: #05210f; }
.save-badge { color: var(--accent); font-size: 13px; font-weight: 600; margin-left: 8px; }

/* misc */
.tag { display: inline-block; font-size: 12px; background: var(--panel2); border: 1px solid var(--border); color: var(--muted); padding: 3px 9px; border-radius: 999px; }
footer { border-top: 1px solid var(--border); margin-top: 40px; padding: 28px 0; color: var(--muted); font-size: 14px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: .06em; }
.notice { padding: 12px 14px; border-radius: 10px; font-size: 14px; margin: 12px 0; }
.notice.ok { background: #0f2a1a; border: 1px solid #1f5034; color: var(--accent); }
.notice.err { background: #2a1212; border: 1px solid #5a2525; color: var(--danger); }
.mono { font-family: var(--mono); }
.keybox { display: flex; gap: 10px; align-items: center; }
.keybox input { flex: 1; }
.bar { height: 10px; background: var(--panel2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.bar > i { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent2)); }
@media (max-width: 820px) {
  .pricing { grid-template-columns: 1fr 1fr; }
  .demo .row { grid-template-columns: 1fr; }
  .hero h1 { font-size: 38px; }
}