@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:wght@400;600;700;800;900&family=DM+Mono:wght@400;500&family=Gilda+Display&display=swap');

:root {
  /* Topaz */
  --topaz-50: #EDF3FF;
  --topaz-100: #D6E4FF;
  --topaz-200: #B5CFFF;
  --topaz-300: #80ABFF;
  --topaz-400: #4883FF;
  --topaz-500: #1E6FFF;
  --topaz-600: #0056FF;
  --topaz-700: #0059FF;
  --topaz-800: #0844C5;
  --topaz-900: #0B3179;
  --topaz-950: #0A1C3E;

  /* Terra Cotta */
  --terra-500: #F6834B;
  --terra-600: #E33F1F;

  /* Slate */
  --slate-00: #FFFFFF;
  --slate-50: #F4F5F5;
  --slate-100: #E7E8E9;
  --slate-200: #DCDEE0;
  --slate-300: #B6BAC1;
  --slate-400: #969CA6;
  --slate-500: #767989;
  --slate-600: #545868;
  --slate-700: #393E48;
  --slate-800: #1B1F27;
  --slate-900: #151718;
  --slate-960: #101114;

  /* Vanilla */
  --vanilla-50: #FDFAF2;
  --vanilla-100: #F8F1DD;
  --vanilla-200: #E5E0D2;

  /* Fonts */
  --font-primary: 'Hanken Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'DM Mono', 'Courier New', monospace;
  --font-display: 'Gilda Display', Georgia, serif;

  /* Semantic */
  --color-bg: var(--vanilla-50);
  --color-surface: var(--slate-00);
  --color-text: var(--slate-800);
  --color-text-secondary: var(--slate-500);
  --color-text-tertiary: var(--slate-400);
  --color-border: var(--slate-100);
  --color-border-subtle: var(--slate-50);
  --color-accent: var(--topaz-700);
  --color-accent-light: var(--topaz-50);
  --color-code-bg: var(--slate-50);
  --max-width: 740px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: var(--slate-960);
    --color-surface: var(--slate-900);
    --color-text: #E6EDF3;
    --color-text-secondary: var(--slate-400);
    --color-text-tertiary: var(--slate-600);
    --color-border: var(--slate-700);
    --color-border-subtle: #1a1d24;
    --color-accent: var(--topaz-400);
    --color-accent-light: var(--topaz-950);
    --color-code-bg: #161b22;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  letter-spacing: -0.01em;
}

/* ── Header ─────────────────────────────────────────── */

header {
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  color: var(--color-text);
}

.header-logo {
  height: 28px;
  width: auto;
}

.header-logo-dark {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .header-logo-light {
    display: none;
  }
  .header-logo-dark {
    display: block;
  }
}

.header-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.1875rem 0.5rem;
}

/* ── Main ───────────────────────────────────────────── */

main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
}

/* ── Index Page ──────────────────────────────────────── */

.index {
  padding: 3rem 0;
}

.index h1 {
  font-family: var(--font-primary);
  font-size: 1.875rem;
  font-weight: 900;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
}

.index-intro {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.index-intro a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.index-intro a:hover {
  border-bottom-color: var(--color-accent);
}

.index-links {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.index-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-accent);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: background-color 0.15s, border-color 0.15s;
}

.index-link:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
}

.index-link svg {
  flex-shrink: 0;
}

/* ── Issue Page ──────────────────────────────────────── */

.issue-identifier {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.625rem;
  display: block;
}

.issue h1 {
  font-family: var(--font-primary);
  font-size: 1.875rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.issue-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.status {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex-shrink: 0;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  border-radius: 4px;
  border: 1px solid;
}

/* ── GitHub PRs ──────────────────────────────────────── */

.github-prs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  font-size: 0.875rem;
}

.github-prs-icon {
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.github-pr-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.github-pr-link:hover {
  border-bottom-color: var(--color-accent);
}

/* ── Description / Markdown ─────────────────────────── */

.description {
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: -0.01em;
}

.description h1,
.description h2,
.description h3,
.description h4 {
  font-family: var(--font-primary);
  letter-spacing: -0.02em;
  margin-top: 2em;
  margin-bottom: 0.5em;
}

.description h1 {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.25;
}

.description h2 {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.25;
}

.description h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.35;
}

.description h4 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
}

.description h5,
.description h6 {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 2em;
  margin-bottom: 0.5em;
  color: var(--color-text-secondary);
}

.description h5 { font-size: 0.875rem; }
.description h6 { font-size: 0.8125rem; }

.description p {
  margin-bottom: 1em;
}

.description ul,
.description ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

.description li {
  margin-bottom: 0.25em;
}

.description li + li {
  margin-top: 0.125em;
}

.description code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.description pre {
  background: var(--color-code-bg);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  overflow-x: auto;
  margin-bottom: 1.25em;
  font-size: 0.875rem;
  line-height: 1.6;
}

.description pre code {
  background: none;
  padding: 0;
  border: none;
  border-radius: 0;
  font-size: inherit;
}

.description blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.5rem 1rem;
  margin-bottom: 1em;
  color: var(--color-text-secondary);
  background: var(--color-accent-light);
  border-radius: 0 6px 6px 0;
}

.description blockquote p:last-child {
  margin-bottom: 0;
}

.description a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.description a:hover {
  border-bottom-color: var(--color-accent);
}

.description img {
  max-width: 100%;
  border-radius: 8px;
  margin: 0.5em 0;
}

.description table {
  border-collapse: collapse;
  width: 100%;
  margin-bottom: 1.25em;
  font-size: 0.9375rem;
}

.description th,
.description td {
  border: 1px solid var(--color-border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.description th {
  font-weight: 600;
  background: var(--color-code-bg);
}

.description hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2em 0;
}

/* Task list checkboxes (GFM) */
.description ul.contains-task-list {
  list-style: none;
  padding-left: 0;
}

.description .task-list-item {
  display: flex;
  align-items: baseline;
  gap: 0.5em;
}

.description .task-list-item input[type="checkbox"] {
  margin: 0;
  accent-color: var(--color-accent);
}

/* ── Stub / Not Found ───────────────────────────────── */

.stub,
.not-found {
  text-align: center;
  padding: 5rem 0;
}

.stub h1,
.not-found h1 {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.625rem;
}

.stub p,
.not-found p {
  color: var(--color-text-secondary);
  font-size: 1rem;
}

.stub .issue-identifier,
.not-found .issue-identifier {
  display: inline-block;
  margin-bottom: 1.5rem;
}

/* ── Footer ─────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  background: var(--color-surface);
}

footer svg {
  width: 14px;
  height: 14px;
  opacity: 0.5;
}

footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s;
}

footer a:hover {
  color: var(--color-accent);
}

/* ── Responsive ─────────────────────────────────────── */

@media (max-width: 640px) {
  main {
    padding: 1.75rem 1.25rem 2.5rem;
  }

  .issue h1 {
    font-size: 1.5rem;
  }

  .description pre {
    font-size: 0.8125rem;
    padding: 0.875rem 1rem;
  }
}