/* howmanytokens.io — system fonts only, no external resources */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-card: #ffffff;
  --fg: #0b0c0f;
  --fg-soft: #555a66;
  --fg-mute: #8a8f9c;
  --border: #e6e8ec;
  --accent: #0b0c0f;
  --accent-fg: #c8ff5e;
  --link: #2a4cf2;
  --warn-bg: #fff8e1;
  --warn-fg: #6b4f00;
  --warn-border: #f0d875;
  --good: #0a7a3b;
  --approx: #b25e00;
  --code-bg: #f1f3f6;
  --shadow: 0 1px 2px rgba(15, 17, 26, 0.04), 0 4px 16px rgba(15, 17, 26, 0.04);
  --radius: 10px;
  --maxw: 920px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c0f;
    --bg-soft: #14161b;
    --bg-card: #14161b;
    --fg: #f3f5f8;
    --fg-soft: #b3b8c2;
    --fg-mute: #7a8090;
    --border: #25282f;
    --accent: #c8ff5e;
    --accent-fg: #0b0c0f;
    --link: #8aa2ff;
    --warn-bg: #2a2410;
    --warn-fg: #f3d77a;
    --warn-border: #5a4a1e;
    --good: #6cd498;
    --approx: #f3a85a;
    --code-bg: #1c1f26;
  }
}

[data-theme="light"] {
  --bg: #ffffff; --bg-soft: #f6f7f9; --bg-card: #ffffff; --fg: #0b0c0f;
  --fg-soft: #555a66; --fg-mute: #8a8f9c; --border: #e6e8ec; --accent: #0b0c0f;
  --accent-fg: #c8ff5e; --link: #2a4cf2; --warn-bg: #fff8e1; --warn-fg: #6b4f00;
  --warn-border: #f0d875; --good: #0a7a3b; --approx: #b25e00; --code-bg: #f1f3f6;
}
[data-theme="dark"] {
  --bg: #0b0c0f; --bg-soft: #14161b; --bg-card: #14161b; --fg: #f3f5f8;
  --fg-soft: #b3b8c2; --fg-mute: #7a8090; --border: #25282f; --accent: #c8ff5e;
  --accent-fg: #0b0c0f; --link: #8aa2ff; --warn-bg: #2a2410; --warn-fg: #f3d77a;
  --warn-border: #5a4a1e; --good: #6cd498; --approx: #f3a85a; --code-bg: #1c1f26;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  background: var(--code-bg);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}
pre {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 14px 0;
}
pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(1.1) blur(6px);
}
.brand {
  font-size: 1.05rem;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.topbar nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
  font-size: 0.92rem;
}
.topbar nav a { color: var(--fg-soft); }
.topbar nav a:hover { color: var(--fg); }
#theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  width: 32px; height: 32px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
#theme-toggle:hover { background: var(--bg-soft); }

/* ---------- main / hero ---------- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.hero { margin-bottom: 28px; }
.hero h1 {
  font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}
.subtitle {
  color: var(--fg-soft);
  font-size: 1.05rem;
  margin: 0;
  max-width: 64ch;
}

/* ---------- counter ---------- */
.counter {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

textarea#input {
  width: 100%;
  min-height: 160px;
  resize: vertical;
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  transition: border-color 0.12s;
}
textarea#input:focus { border-color: var(--fg-mute); }

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--fg-soft);
  padding: 10px 2px 4px;
}
.meta-row .staleness { margin-left: auto; }

.split {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 2px 4px;
  font-size: 0.92rem;
  color: var(--fg-soft);
}
.split label { white-space: nowrap; }
.split input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}
.split-help {
  color: var(--fg-mute);
  font-size: 0.78rem;
  white-space: nowrap;
}
@media (max-width: 640px) {
  .split { flex-wrap: wrap; }
  .split-help { flex-basis: 100%; padding-left: 0; }
}

/* ---------- results table ---------- */
.results-wrap { overflow-x: auto; margin-top: 8px; }
.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}
.results th, .results td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.results th {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-mute);
}
.results td.num, .results th.num { text-align: right; font-family: var(--mono); }
.results .empty {
  color: var(--fg-mute);
  text-align: center;
  padding: 32px 12px;
}
.results .model-cell {
  display: flex;
  align-items: center;
  gap: 10px;
}
.results .model-cell .swatch {
  width: 8px; height: 8px; border-radius: 50%; flex: none;
}
.results .model-cell a { color: var(--fg); }
.results .model-cell a:hover { color: var(--link); text-decoration: underline; }
.results .family { color: var(--fg-mute); font-size: 0.78rem; }

.confidence {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid currentColor;
}
.confidence.exact { color: var(--good); }
.confidence.approx { color: var(--approx); }
.confidence.degraded { color: var(--warn-fg); border-style: dashed; }

.cost-zero { color: var(--fg-mute); }

/* ---------- banner ---------- */
.banner {
  margin-top: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
}
.banner-warn {
  background: var(--warn-bg);
  border-color: var(--warn-border);
  color: var(--warn-fg);
}

/* ---------- SEO content ---------- */
.seo-content {
  margin-top: 48px;
  max-width: 70ch;
}
.seo-content h2 {
  font-size: 1.25rem;
  margin: 28px 0 8px;
  letter-spacing: -0.01em;
}
.seo-content h3 {
  font-size: 1.02rem;
  margin: 22px 0 4px;
  color: var(--fg);
}
.seo-content p {
  color: var(--fg-soft);
  margin: 8px 0;
}

.compare-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 6px 16px;
}
.compare-list li {
  padding: 6px 10px;
  border-left: 2px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 0 6px 6px 0;
  font-size: 0.92rem;
}
.compare-list a { color: var(--fg); font-weight: 600; }
.compare-list a:hover { color: var(--link); }
.compare-list .family { color: var(--fg-mute); font-weight: 400; font-size: 0.82rem; }

/* ---------- footer ---------- */
.foot {
  border-top: 1px solid var(--border);
  margin-top: 56px;
  padding: 24px;
  text-align: center;
  color: var(--fg-mute);
  font-size: 0.88rem;
}
.foot p { margin: 0 0 6px; max-width: 60ch; margin-left: auto; margin-right: auto; }
.foot nav a { color: var(--fg-soft); margin: 0 2px; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .topbar { padding: 12px 14px; gap: 14px; }
  .topbar nav { gap: 12px; font-size: 0.85rem; }
  main { padding: 22px 14px 60px; }
  .counter { padding: 12px; }
  .results th, .results td { padding: 8px 8px; font-size: 0.88rem; }
}