:root {
  color-scheme: dark;
  --bg: #07111f;
  --panel: #0d1b2d;
  --panel-2: #11243a;
  --line: #263d56;
  --text: #f4f8fb;
  --muted: #9fb0c3;
  --cyan: #30d5c8;
  --blue: #6b8cff;
  --amber: #ffbd59;
  --red: #ff6b72;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(circle at 10% -10%, #173557 0, var(--bg) 36%); color: var(--text); }
a { color: var(--text); text-decoration: none; }
.topbar { height: 72px; padding: 0 max(24px, calc((100vw - 1180px) / 2)); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); background: rgba(7, 17, 31, .84); backdrop-filter: blur(14px); position: sticky; top: 0; z-index: 2; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; font-weight: 800; color: #06111d; background: linear-gradient(135deg, var(--cyan), #86f6e5); }
.brand strong, .brand small { display: block; }
.brand small { color: var(--muted); margin-top: 2px; }
main { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.hero { padding: 72px 0 40px; display: grid; grid-template-columns: 1fr auto; gap: 42px; align-items: end; }
.eyebrow, .section-label { color: var(--cyan); letter-spacing: .12em; font-size: 12px; font-weight: 800; }
h1 { font-size: clamp(38px, 5vw, 66px); max-width: 880px; line-height: 1.03; margin: 12px 0 20px; letter-spacing: -.04em; }
.lead { max-width: 760px; color: #c6d2df; line-height: 1.7; font-size: 18px; margin: 0; }
.guardrail { border: 1px solid #286657; background: #0d2b29; border-radius: 16px; padding: 18px 20px; min-width: 255px; }
.guardrail span { color: var(--cyan); font-weight: 800; font-size: 12px; letter-spacing: .1em; }
.guardrail p { margin: 8px 0 0; color: #c5eae3; font-size: 13px; }
.workspace { display: grid; grid-template-columns: 320px 1fr; background: rgba(13, 27, 45, .9); border: 1px solid var(--line); border-radius: 22px; overflow: hidden; box-shadow: 0 26px 80px rgba(0,0,0,.28); }
.controls { padding: 28px; border-right: 1px solid var(--line); background: rgba(8, 22, 38, .74); }
.controls label { display: block; color: #cbd7e4; font-size: 13px; margin: 24px 0 9px; }
.score-picker { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
button { border: 1px solid var(--line); border-radius: 12px; background: #0c1a2a; color: var(--text); padding: 12px 6px; font-size: 18px; cursor: pointer; }
button small { display: block; color: var(--muted); font-size: 10px; margin-top: 3px; }
button.active { border-color: var(--cyan); box-shadow: 0 0 0 1px var(--cyan) inset; background: #103437; }
.input-wrap { display: grid; grid-template-columns: 58px 1fr; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.input-wrap span { display: grid; place-items: center; color: var(--muted); font-size: 12px; background: #0a1726; border-right: 1px solid var(--line); }
input { min-width: 0; padding: 13px 12px; border: 0; color: var(--text); background: #102136; font: inherit; outline: 0; }
.hint { color: var(--muted); font-size: 12px; line-height: 1.55; margin: 24px 0 0; }
.results { padding: 28px; }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.metric-grid article { min-height: 126px; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: linear-gradient(155deg, var(--panel-2), #0b1929); }
.metric-grid span, .decision span { color: var(--muted); font-size: 12px; }
.metric-grid strong { display: block; margin: 16px 0 4px; font-size: 29px; letter-spacing: -.03em; }
.metric-grid small { color: #7f94aa; }
.metric-grid .accent { border-color: #326c6a; background: linear-gradient(145deg, #123a3b, #0d2631); }
.decision { margin-top: 16px; padding: 22px; border-radius: 16px; border: 1px solid var(--line); background: #091727; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 10px 20px; }
.decision strong { display: block; font-size: 32px; margin-top: 4px; }
.status { border-radius: 999px; padding: 8px 12px; font-weight: 700; font-size: 12px; }
.status.safe { background: #123c35; color: #71e8cd; }
.status.warning { background: #493814; color: #ffd06c; }
.status.danger { background: #4a2027; color: #ff9aa0; }
.health-track { grid-column: 1 / -1; height: 8px; border-radius: 99px; background: #1d3147; overflow: hidden; }
.health-track span { display: block; height: 100%; width: 70%; border-radius: inherit; background: linear-gradient(90deg, var(--red), var(--amber), var(--cyan)); transition: width .2s ease; }
.decision p { grid-column: 1 / -1; color: #afbdcb; margin: 4px 0 0; line-height: 1.5; }
.method { padding: 58px 0 72px; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 18px; }
.steps article { border-top: 2px solid var(--line); padding: 20px 8px 0 0; }
.steps b { color: var(--cyan); }
.steps h2 { font-size: 17px; margin: 14px 0 8px; }
.steps p { color: var(--muted); line-height: 1.55; font-size: 14px; }
footer { border-top: 1px solid var(--line); color: var(--muted); text-align: center; padding: 28px; font-size: 13px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .guardrail { width: fit-content; }
  .workspace { grid-template-columns: 1fr; }
  .controls { border-right: 0; border-bottom: 1px solid var(--line); }
  .metric-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .topbar { padding: 0 18px; }
  .topbar > a { display: none; }
  main { width: min(100% - 24px, 1180px); }
  .hero { padding-top: 42px; }
  .metric-grid, .steps { grid-template-columns: 1fr; }
  .results, .controls { padding: 20px; }
}