/* Matches frontiermachines.ai: near-black, Inter 500 tight-tracked headings,
   mono pill labels with a green dot, 19px dark cards, white pill buttons. */
:root {
  --bg: #0d0d0d; --card: #141414; --field: #0f0f0f;
  --ink: rgba(255, 255, 255, .9); --muted: rgba(255, 255, 255, .6); --faint: rgba(255, 255, 255, .4);
  --line: rgba(255, 255, 255, .08); --line-strong: rgba(255, 255, 255, .18);
  --green: #3ddc84; --error: #ff7a6b;
  --sans: Inter, system-ui, -apple-system, sans-serif;
  --mono: "Google Sans Code", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.5 var(--sans); -webkit-font-smoothing: antialiased; }

.top { display: flex; align-items: center; justify-content: space-between; max-width: 1080px; margin: 0 auto; padding: 20px 16px; }
.top img { display: block; height: 36px; width: auto; }
.top a.back { color: var(--muted); font: 500 14px var(--sans); text-decoration: none; }
.top a.back:hover { color: #fff; }

main { max-width: 600px; margin: 0 auto; padding: 32px 16px 72px; }

.pill { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px 6px 10px; border: 1px solid rgba(61, 220, 132, .35);
  border-radius: 100px; background: rgba(61, 220, 132, .06); font: 400 13px var(--mono); letter-spacing: -.03em;
  color: rgba(255, 255, 255, .8); text-transform: capitalize; }
.pill::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); }

h1 { margin: 16px 0 12px; font: 500 48px/1.05 var(--sans); letter-spacing: -.04em; color: #fff; }
.lede { margin: 0 0 32px; color: var(--muted); font-size: 17px; letter-spacing: -.01em; }

.card { margin: 0 0 16px; padding: 28px; border: 1px solid var(--line); border-radius: 19px;
  background: linear-gradient(180deg, #171717 0%, var(--card) 100%); }
.card h2 { margin: 0 0 20px; font: 500 22px var(--sans); letter-spacing: -.03em; color: #fff; }
fieldset.card { min-width: 0; }
legend { float: left; width: 100%; padding: 0; margin: 0 0 20px; font: 500 22px var(--sans); letter-spacing: -.03em; color: #fff; }
legend + * { clear: both; }

label { display: block; margin: 0 0 16px; font-size: 14px; color: var(--muted); }
label:last-child { margin-bottom: 0; }
input:not([type=radio]) { display: block; width: 100%; margin-top: 6px; padding: 12px 14px; font: 400 16px var(--sans); color: #fff;
  background: var(--field); border: 1px solid var(--line-strong); border-radius: 12px; transition: border-color .15s; }
input:not([type=radio]):hover { border-color: rgba(255, 255, 255, .3); }
input:focus { outline: none; border-color: var(--green) !important; box-shadow: 0 0 0 3px rgba(61, 220, 132, .15); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
.grid2 label { margin-bottom: 16px; }
@media (max-width: 520px) { .grid2 { grid-template-columns: 1fr; } }

.total { display: flex; justify-content: space-between; align-items: flex-end; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.total .label { font: 400 13px var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: .02em; }
.total strong { display: block; font: 500 52px/1 var(--sans); letter-spacing: -.04em; color: #fff; text-align: right; }
.total small { display: block; margin-top: 6px; color: var(--muted); font-size: 14px; text-align: right; }

.choice { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 10px; padding: 16px; border: 1px solid var(--line-strong);
  border-radius: 14px; color: #fff; cursor: pointer; transition: border-color .15s, background .15s; }
.choice:last-child { margin-bottom: 0; }
.choice:hover { border-color: rgba(255, 255, 255, .3); }
.choice:has(input:checked) { border-color: var(--green); background: rgba(61, 220, 132, .05); }
.choice input { margin: 3px 0 0; accent-color: var(--green); }
.choice b { font-weight: 500; letter-spacing: -.01em; }
.choice small { display: block; margin-top: 2px; color: var(--muted); font-size: 14px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 0 24px; height: 52px;
  font: 500 16px var(--sans); color: #000; background: #fff; border: 0; border-radius: 40px; cursor: pointer; text-decoration: none;
  transition: opacity .15s; }
.btn::after { content: "↗"; font-size: 15px; }
.btn:hover { opacity: .88; }
.btn:disabled { opacity: .5; cursor: wait; }
form .btn { width: 100%; margin-top: 8px; }

.fine { margin-top: 16px; font: 400 12px var(--mono); color: var(--faint); text-align: center; letter-spacing: -.02em; }
.error { margin: 0 0 16px; padding: 14px 16px; border: 1px solid rgba(255, 122, 107, .4); border-radius: 12px;
  background: rgba(255, 122, 107, .06); color: var(--error); }

footer { max-width: 1080px; margin: 0 auto; padding: 32px 16px 40px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font: 400 12px var(--mono); color: var(--faint); }

@media (max-width: 520px) { h1 { font-size: 38px; } .card { padding: 22px; } .total strong { font-size: 44px; } }