@font-face {
  font-family: "Monaspace Neon";
  src: url("https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.301/fonts/Web%20Fonts/Variable%20Web%20Fonts/Monaspace%20Neon/Monaspace%20Neon%20Var.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
}

@font-face {
  font-family: "Monaspace Argon";
  src: url("https://cdn.jsdelivr.net/gh/githubnext/monaspace@v1.301/fonts/Web%20Fonts/Variable%20Web%20Fonts/Monaspace%20Argon/Monaspace%20Argon%20Var.woff2") format("woff2");
  font-weight: 200 800;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #0d1117;
  --ink: #e6edf3;
  --muted: #8b949e;
  --panel: #161b22;
  --accent: #58a6ff;
  --accent-2: #79c0ff;
  --line: #30363d;
  --shadow: rgba(0, 0, 0, 0.3);
  --radius: 18px;
  --font-body: "Monaspace Neon", ui-monospace, "Cascadia Code", monospace;
  --font-heading: "Monaspace Argon", ui-monospace, "Cascadia Code", monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
}

.page {
  min-height: 100vh;
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.hero {
  max-width: 760px;
  text-align: left;
  margin-bottom: 24px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.7rem;
  color: var(--accent);
  margin: 0 0 12px;
}

.hero h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.lede {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0;
}

.card {
  width: min(920px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 20px 50px var(--shadow);
}

.flow {
  display: grid;
  gap: 26px;
}

.question {
  border-radius: 14px;
  padding: 20px 22px;
  background: #1c2129;
  border: 1px solid var(--line);
  opacity: 1;
  transform: translateY(0);
  transition: opacity 220ms ease, transform 220ms ease;
}

.question.hidden {
  display: none;
}

.question h2 {
  font-size: 1.05rem;
  margin: 0 0 14px;
}

.options {
  display: grid;
  gap: 10px;
}

.option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: var(--panel);
  cursor: pointer;
  transition: border 150ms ease, background 150ms ease, transform 150ms ease;
}

.option:hover {
  border-color: var(--line);
  transform: translateY(-1px);
}

.option:has(input:checked) {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
}

.option:has(input:focus-visible) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.option input {
  accent-color: var(--accent);
}

.option span {
  font-size: 0.95rem;
  color: var(--ink);
  margin: 0;
}

.inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}

.inputs.single {
  grid-template-columns: minmax(220px, 280px);
}

.inputs label span {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 6px;
}

input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 150ms ease;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.hint {
  margin: 12px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.result {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 28px;
  padding: 20px 22px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, #1a2332, #151d28);
  animation: rise 260ms ease;
}

.result.hidden {
  display: none;
}

.result-label {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.result-value {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 6px 0 0;
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.result-note {
  margin: 0;
  color: var(--accent-2);
  font-size: 0.9rem;
}

.footnote {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
  font-size: 0.9rem;
  color: var(--muted);
}

.footnote a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.footnote a:hover {
  text-decoration: underline;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  .card {
    padding: 24px;
  }

  .result {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}