/* ── Reset & Custom Properties ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #F5F3EF;
  --surface:      #FFFFFF;
  --ink:          #1A1A18;
  --ink-muted:    #6B6966;
  --rule:         #E0DDD7;
  --accent:       #1A1A18;
  --accent-inv:   #F5F3EF;
  --source-bg:    #1A1A18;
  --source-text:  #F5F3EF;
  --err:          #B94040;

  --font-serif:   'Cormorant Garamond', Georgia, serif;
  --font-sans:    'Inter', system-ui, -apple-system, sans-serif;

  --radius:       6px;
  --container:    900px;
  --gap:          1.5rem;
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body { background: var(--bg); color: var(--ink); font-family: var(--font-sans); line-height: 1.6; }

/* ── Layout Utilities ────────────────────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--rule);
  padding-block: 1.1rem;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  text-decoration: none;
  color: var(--ink);
}

.logo-mark {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: .08em;
  background: var(--ink);
  color: var(--accent-inv);
  padding: .18em .48em;
  border-radius: 3px;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: .01em;
}
.logo-text em { font-style: italic; }

/* ── Hero ────────────────────────────────────────────────────────────────── */
.hero {
  padding-block: 4.5rem 3rem;
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -.01em;
  margin-bottom: 1.1rem;
}

.hero h1 em {
  font-style: italic;
  color: var(--ink-muted);
}

.hero-sub {
  font-size: .95rem;
  color: var(--ink-muted);
  max-width: 52ch;
  line-height: 1.7;
}

/* ── Converter Form ──────────────────────────────────────────────────────── */
.converter {
  padding-block: 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  flex: 1 1 180px;
}

.field-group--action { flex: 0 0 auto; }

label {
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: '';
  position: absolute;
  right: .9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--ink-muted);
  pointer-events: none;
}

select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: .65rem 2.4rem .65rem .85rem;
  font-family: var(--font-sans);
  font-size: .9rem;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s;
}

select:focus {
  outline: none;
  border-color: var(--ink);
}

select:disabled {
  opacity: .45;
  cursor: not-allowed;
}

button[type="submit"] {
  background: var(--ink);
  color: var(--accent-inv);
  border: none;
  border-radius: var(--radius);
  padding: .7rem 1.75rem;
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .02em;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
  white-space: nowrap;
}

button[type="submit"]:hover:not(:disabled) { opacity: .82; }
button[type="submit"]:active:not(:disabled) { transform: scale(.98); }
button[type="submit"]:disabled { opacity: .35; cursor: not-allowed; }

.form-error {
  margin-top: .6rem;
  font-size: .82rem;
  color: var(--err);
  min-height: 1.2em;
}

/* ── Results ─────────────────────────────────────────────────────────────── */
.results-section { padding-block: 2.75rem; }

.results-section[hidden] { display: none; }

.results-heading {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: .005em;
  margin-bottom: 1.6rem;
}

.results-heading em { font-style: italic; }

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: .85rem;
  margin-bottom: 1.75rem;
}

.result-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1rem .95rem;
  display: flex;
  flex-direction: column;
  gap: .3rem;
  transition: border-color .15s;
}

.result-card:hover { border-color: var(--ink-muted); }

.result-card--source {
  background: var(--source-bg);
  border-color: var(--source-bg);
  color: var(--source-text);
}

.result-card--source:hover { border-color: var(--source-bg); }

.card-region {
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.result-card--source .card-region {
  color: rgba(245, 243, 239, .55);
}

.card-size {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
}

.card-source-badge {
  font-size: .65rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: rgba(245, 243, 239, .55);
  margin-top: .15rem;
}

/* ── Disclaimer ──────────────────────────────────────────────────────────── */
.disclaimer {
  font-size: .78rem;
  color: var(--ink-muted);
  line-height: 1.65;
  max-width: 60ch;
  padding-top: .5rem;
  border-top: 1px solid var(--rule);
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: 1.4rem;
  margin-top: 2rem;
}

.site-footer p {
  font-size: .78rem;
  color: var(--ink-muted);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero { padding-block: 2.75rem 2rem; }

  .form-row { flex-direction: column; gap: .85rem; }
  .field-group { flex: 1 1 100%; }
  .field-group--action { width: 100%; }
  .field-group--action button { width: 100%; }

  .results-grid { grid-template-columns: repeat(2, 1fr); }

  .card-size { font-size: 1.75rem; }
}