:root {
  color-scheme: dark;
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #22c55e;
  --border: #334155;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: linear-gradient(180deg, #020617, var(--bg));
  color: var(--text);
}

.shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

.hero {
  margin-bottom: 20px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  font-size: 0.8rem;
}

h1, h2, h3 {
  margin-top: 0;
}

.subhead,
.hint,
.preset-card p,
.faq p {
  color: var(--muted);
  line-height: 1.6;
}

.compact {
  margin-bottom: 0;
}

.hero-actions,
.share-block {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button-link,
button {
  border: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #062033;
  font-weight: 700;
  padding: 12px 18px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.button-link-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.card {
  background: rgba(17, 24, 39, 0.95);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(2, 6, 23, 0.35);
}

.section-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 18px;
}

.field-grid,
.preset-grid,
.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.field-grid {
  margin: 18px 0;
}

.preset-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(31, 41, 55, 0.7);
}

.preset-button {
  width: 100%;
  margin-top: 8px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

input {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 12px 14px;
  font-size: 1rem;
}

.results {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px 16px;
  margin: 0 0 20px;
}

.results dt {
  color: var(--muted);
}

.results dd {
  margin: 0;
  font-weight: 700;
}

.share-block {
  align-items: flex-end;
}

.share-block label {
  flex: 1 1 320px;
}

.notes ul {
  margin: 0;
  padding-left: 20px;
  line-height: 1.7;
  color: var(--muted);
}

.faq {
  margin-top: 20px;
}

.faq article {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(31, 41, 55, 0.45);
}

@media (max-width: 640px) {
  .shell {
    padding: 24px 16px 48px;
  }

  .section-heading {
    align-items: flex-start;
  }

  .share-block,
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
}