/* =====================================================
   Custom Properties
   ===================================================== */
:root {
  --bg:      oklch(97% 0.018 70);
  --surface: oklch(99% 0.008 70);
  --fg:      oklch(22% 0.02 50);
  --muted:   oklch(50% 0.018 50);
  --border:  oklch(90% 0.014 70);
  --accent:  oklch(64% 0.13 28);
  --accent-tint: color-mix(in oklch, var(--accent) 12%, var(--surface));
  --accent-line: color-mix(in oklch, var(--accent) 30%, var(--border));

  --font-display: 'Newsreader', 'Tiempos Headline', 'Iowan Old Style', Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  --radius: 16px;
  --radius-sm: 11px;
  --maxw: 1100px;
}

/* =====================================================
   Reset & Base
   ===================================================== */
* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

/* =====================================================
   Header
   ===================================================== */
header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklch, var(--surface) 70%, transparent);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 560;
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 9px;
}

.wordmark .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  transform: translateY(-1px);
}

/* =====================================================
   Language Selector
   ===================================================== */
.lang-wrap {
  display: flex;
  align-items: center;
  gap: 9px;
}

.lang-wrap label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 550;
}

select.lang {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease;
}

select.lang:focus-visible {
  outline: none;
  border-color: var(--accent-line);
  box-shadow: 0 0 0 3px var(--accent-tint);
}

/* =====================================================
   Ad Slots
   ===================================================== */
.ad {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--accent-line);
  border-radius: var(--radius-sm);
  background:
    repeating-linear-gradient(135deg,
      transparent 0 14px,
      color-mix(in oklch, var(--accent) 4%, transparent) 14px 15px),
    var(--surface);
  color: var(--muted);
  position: relative;
  overflow: hidden;
}

.ad span {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 550;
}

.ad-leaderboard {
  width: 100%;
  max-width: 728px;
  height: 90px;
  margin: 22px auto 0;
}

.ad-rectangle {
  width: 300px;
  height: 250px;
  max-width: 100%;
}

/* =====================================================
   Main Layout
   ===================================================== */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 8px 24px 56px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.content { min-width: 0; }

aside {
  position: sticky;
  top: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

/* =====================================================
   Hero
   ===================================================== */
.hero { margin: 40px 0 26px; }

.hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(34px, 5.2vw, 56px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: 0 0 14px;
  max-width: 16ch;
  text-wrap: balance;
}

/* =====================================================
   Converter Card
   ===================================================== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow:
    inset 0 1px 0 color-mix(in oklch, white 60%, transparent),
    0 1px 2px color-mix(in oklch, var(--fg) 6%, transparent);
}

/* Category field sits above the three-column grid */
.category-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.category-field label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
}

.category-field select {
  font-family: var(--font-body);
  font-size: 17px;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 14px;
  width: auto;
  max-width: 240px;
  cursor: pointer;
  transition: border-color .18s ease, box-shadow .18s ease;
}

.field-grid {
  display: grid;
  grid-template-columns: 1.2fr auto 1fr;
  gap: 16px;
  align-items: end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
}

.input-row { display: flex; gap: 10px; }

input[type="text"], .card select, .sys-select {
  font-family: var(--font-body);
  font-size: 17px;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 14px;
  width: 100%;
  transition: border-color .18s ease, box-shadow .18s ease;
}

input[type="text"] {
  width: 96px;
  font-variant-numeric: tabular-nums;
  font-weight: 550;
}

input:focus-visible, .card select:focus-visible, .sys-select:focus-visible,
.category-field select:focus-visible {
  outline: none;
  border-color: var(--accent-line);
  box-shadow: 0 0 0 3px var(--accent-tint);
}

input.err {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-tint);
}

/* =====================================================
   Swap Button
   ===================================================== */
.swap {
  width: 46px;
  height: 46px;
  flex: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 50%;
  cursor: pointer;
  color: var(--muted);
  display: grid;
  place-items: center;
  margin-bottom: 1px;
  transition: transform .25s ease, color .18s ease, border-color .18s ease;
}

.swap:hover { color: var(--fg); border-color: var(--accent-line); }
.swap:active { transform: rotate(180deg); }
.swap svg { width: 19px; height: 19px; }

/* =====================================================
   Convert Button & Error
   ===================================================== */
.convert-row {
  margin-top: 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

button.convert {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: oklch(99% 0.01 70);
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px 30px;
  cursor: pointer;
  transition: filter .18s ease, transform .06s ease;
}

button.convert:hover { filter: brightness(1.05); }
button.convert:active { transform: translateY(1px); }
button.convert:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-tint), 0 0 0 4px var(--accent-line);
}

.error-msg {
  color: var(--accent);
  font-size: 14px;
  margin: 0;
  display: none;
}

.error-msg.show { display: block; }

/* =====================================================
   Result
   ===================================================== */
.result {
  margin-top: 30px;
  display: none;
}

.result.show {
  display: block;
  animation: rise .5s cubic-bezier(.2,.7,.2,1) both;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}

.result-headline {
  display: flex;
  align-items: baseline;
  gap: 18px;
  flex-wrap: wrap;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}

.result-lead {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-weight: 600;
}

.result-big {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(56px, 11vw, 96px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.result-sys {
  font-family: var(--font-display);
  font-size: clamp(19px, 3vw, 24px);
  color: var(--fg);
  font-style: italic;
}

/* =====================================================
   Comparison Grid
   ===================================================== */
.compare-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
  margin: 24px 0 14px;
}

.compare-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(108px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.cell {
  background: var(--surface);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.cell .c-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cell .c-val {
  font-family: var(--font-display);
  font-size: 27px;
  font-weight: 500;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.cell.is-target {
  background: var(--accent-tint);
}

.cell.is-target .c-val { color: var(--accent); }

.cell.is-source .c-label::after {
  content: "•";
  margin-inline-start: 5px;
  color: var(--muted);
}

/* =====================================================
   Disclaimer & Footer
   ===================================================== */
.disclaimer {
  margin-top: 28px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--muted);
  max-width: 62ch;
}

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px 24px;
}

/* =====================================================
   RTL
   ===================================================== */
html[dir="rtl"] .wordmark .dot { transform: translateY(-1px); }

/* =====================================================
   Responsive — ≤ 860px
   ===================================================== */
@media (max-width: 860px) {
  main {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  aside {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }

  .field-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .swap {
    transform: rotate(90deg);
    justify-self: center;
  }

  html[dir="rtl"] .swap { transform: rotate(90deg); }

  .swap:active { transform: rotate(270deg); }
}

/* =====================================================
   Focus indicators (accessibility)
   ===================================================== */
a:focus-visible,
select:focus-visible,
input:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}