/* WORD-DRIFT public site (site.css)
   Design language: light editorial data product. Warm off-white canvas,
   crisp white cards with soft shadows, dark readable text, and a lively
   multi-hue accent palette for the data encodings.
   Light is the default theme; the original dark palette lives under
   [data-theme="dark"] so nothing is lost.
   No build step. Vanilla CSS only. */

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

:root {
  /* ── LIGHT palette (default) ──────────────────────────────────── */
  --bg:          #faf7f2;   /* warm off-white canvas */
  --bg-panel:    #f2eee6;   /* slightly deeper warm panel */
  --bg-card:     #ffffff;   /* crisp white card */
  --bg-card2:    #f4f1fb;   /* faint indigo-tinted inset */
  --border:      #e4dfd4;   /* warm hairline */
  --border-soft: #ede9e0;

  --text:        #1b1b2a;   /* near-black slate */
  --text-sub:    #5a5f72;   /* medium grey */
  --text-faint:  #73788c;   /* lighter grey (AA on canvas) */

  --accent:      #4338ca;   /* deep indigo — brand / drift arrows */
  --accent-hi:   #5b4fd6;
  --gold:        #b26a00;   /* trigger events (AA on white) */
  --positive:    #15803d;   /* fresh green */
  --negative:    #dc2626;   /* clear red */
  --neutral:     #6b7280;   /* warm grey-blue */

  /* soft card shadow + hero gradient (light only) */
  --shadow-card:  0 1px 2px rgba(27,27,42,0.04), 0 4px 16px rgba(27,27,42,0.06);
  --shadow-pop:   0 8px 28px rgba(27,27,42,0.14);
  --hero-gradient: radial-gradient(900px 420px at 12% -10%, rgba(67,56,202,0.10), transparent 60%),
                   radial-gradient(700px 400px at 95% 0%, rgba(178,106,0,0.08), transparent 55%);

  /* type scale */
  --font:        "Inter", "Segoe UI", system-ui, sans-serif;
  --font-mono:   "JetBrains Mono", "Fira Mono", "Consolas", monospace;

  --radius:      8px;
  --radius-lg:   14px;
}

/* ── DARK palette (original, opt-in) ──────────────────────────────── */
[data-theme="dark"] {
  --bg:          #0c0d14;
  --bg-panel:    #13141f;
  --bg-card:     #181a28;
  --bg-card2:    #1e2032;
  --border:      #272a3e;
  --border-soft: #1d2033;

  --text:        #dde1f0;
  --text-sub:    #8b93b4;
  --text-faint:  #4e556d;

  --accent:      #5b7cf8;   /* blue — drift arrows */
  --accent-hi:   #8aaeff;
  --gold:        #f5a623;   /* trigger events */
  --positive:    #2ecc7a;
  --negative:    #f05252;
  --neutral:     #8a94b0;

  --shadow-card:  0 1px 2px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.35);
  --shadow-pop:   0 8px 28px rgba(0,0,0,0.45);
  --hero-gradient: radial-gradient(900px 420px at 12% -10%, rgba(91,124,248,0.16), transparent 60%),
                   radial-gradient(700px 400px at 95% 0%, rgba(245,166,35,0.10), transparent 55%);
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img { display: block; max-width: 100%; }

/* ── Site nav ─────────────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 52px;
}

.site-nav .wordmark {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text);
  white-space: nowrap;
  text-decoration: none;
}

.site-nav .wordmark span { color: var(--accent); }

.site-nav ul {
  display: flex;
  gap: 0;
  list-style: none;
  margin-left: auto;
}

.site-nav ul li a {
  display: block;
  padding: 0 1rem;
  height: 52px;
  line-height: 52px;
  font-size: 0.83rem;
  color: var(--text-sub);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.site-nav ul li a:hover,
.site-nav ul li a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ── Theme toggle button (sun / moon) ─────────────────────────────── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-sub);
  cursor: pointer;
  font-size: 0.95rem;
  line-height: 1;
  font-family: var(--font);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* Show the icon matching the action: in light mode show the moon (go dark),
   in dark mode show the sun (go light). Driven by data-theme on <html>. */
.theme-toggle .icon-dark { display: inline; }
.theme-toggle .icon-light { display: none; }
[data-theme="dark"] .theme-toggle .icon-dark { display: none; }
[data-theme="dark"] .theme-toggle .icon-light { display: inline; }

/* In the site nav the toggle sits after the link list. */
.site-nav .theme-toggle { margin-left: 0.75rem; }

/* ── Hero ─────────────────────────────────────────────────────────── */
.hero {
  padding: 5rem 2rem 4rem;
  max-width: 960px;
  margin: 0 auto;
}

/* Inviting, colourful hero wash behind the masthead. */
.hero-wrap {
  background: var(--hero-gradient);
}

.hero-eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1.5rem;
  max-width: 780px;
}

.hero h1 .drift-word {
  color: var(--accent);
  background: linear-gradient(90deg, var(--accent), var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-sub);
  max-width: 600px;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  align-items: center;
}

/* ── Buttons ──────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.35rem;
  border-radius: var(--radius);
  font-size: 0.87rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.1s;
  white-space: nowrap;
}

.btn:hover { opacity: 0.88; transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: none; }

.btn-primary { background: var(--accent); color: #fff; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-sub); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent-hi); }

/* ── Drift example card (hero showcase) ───────────────────────────── */
.drift-card {
  margin: 4rem auto;
  max-width: 960px;
  padding: 0 2rem;
}

.drift-card-inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
}

.drift-sense {
  background: var(--bg-card2);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  border-left: 3px solid currentColor;
}

.drift-sense.positive { color: var(--positive); }
.drift-sense.negative { color: var(--negative); }

.drift-sense-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  opacity: 0.8;
}

.drift-sense-year {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.4rem;
}

.drift-sense-gloss {
  font-size: 0.88rem;
  color: var(--text);
  line-height: 1.5;
}

.drift-arrow-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-faint);
  min-width: 120px;
}

.drift-arrow-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
}

.drift-arrow-svg {
  width: 80px;
  overflow: visible;
}

.drift-trigger-pill {
  background: color-mix(in srgb, var(--gold) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--gold) 30%, transparent);
  border-radius: 999px;
  padding: 0.25rem 0.85rem;
  font-size: 0.72rem;
  color: var(--gold);
  font-weight: 600;
  text-align: center;
  display: inline-block;
  text-decoration: none;
  transition: border-color 0.12s, background 0.12s;
}

a.drift-trigger-pill:hover {
  background: color-mix(in srgb, var(--gold) 20%, transparent);
  border-color: color-mix(in srgb, var(--gold) 55%, transparent);
}

.drift-trigger-label {
  font-size: 0.68rem;
  color: var(--text-faint);
  text-align: center;
}

.drift-confidence {
  font-size: 0.68rem;
  color: var(--text-faint);
  text-align: center;
}

/* ── Section layout ───────────────────────────────────────────────── */
.section {
  padding: 4rem 2rem;
  max-width: 960px;
  margin: 0 auto;
}

.section + .section {
  border-top: 1px solid var(--border-soft);
}

.section-full {
  padding: 4rem 2rem;
  background: var(--bg-panel);
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
}

.section-full-inner {
  max-width: 960px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.85rem;
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-body {
  color: var(--text-sub);
  font-size: 0.95rem;
  line-height: 1.75;
  max-width: 640px;
}

.section-body p + p { margin-top: 0.9rem; }

/* ── Feature grid ─────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 1.6rem;
}

.feature-card-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.feature-card h3 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.82rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ── Drift type taxonomy ──────────────────────────────────────────── */
.taxonomy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.taxonomy-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.taxonomy-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.taxonomy-item {
  font-size: 0.84rem;
  color: var(--text);
  padding: 0.2rem 0;
}

.taxonomy-item + .taxonomy-item {
  margin-top: 0.25rem;
}

/* ── Query showcase ───────────────────────────────────────────────── */
.query-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-top: 1.5rem;
}

.query-card + .query-card { margin-top: 1rem; }

.query-card-header {
  padding: 0.85rem 1.25rem;
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.query-card-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.query-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

.query-tag.novel { background: color-mix(in srgb, var(--gold) 12%, transparent); color: var(--gold); }

pre.query-code {
  margin: 0;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--text-sub);
  overflow-x: auto;
  white-space: pre;
}

/* SPARQL syntax colouring (lightweight), tuned for the light canvas */
pre.query-code .kw  { color: var(--accent); font-weight: 600; }
pre.query-code .pfx { color: var(--gold); }
pre.query-code .var { color: var(--positive); }
pre.query-code .str { color: var(--negative); }
pre.query-code .cmt { color: var(--text-faint); font-style: italic; }

[data-theme="dark"] pre.query-code .kw  { color: #7b97ff; font-weight: 400; }
[data-theme="dark"] pre.query-code .pfx { color: #f5a623; }
[data-theme="dark"] pre.query-code .var { color: #2ecc7a; }
[data-theme="dark"] pre.query-code .str { color: #e08080; }
[data-theme="dark"] pre.query-code .cmt { color: #4e556d; }

/* ── Example word strip ───────────────────────────────────────────── */
.words-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 2rem;
}

.word-pill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 1rem;
  font-size: 0.85rem;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.word-pill-badge {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.word-pill-badge.pejoration { background: color-mix(in srgb, var(--negative) 13%, transparent); color: var(--negative); }
.word-pill-badge.amelioration { background: color-mix(in srgb, var(--positive) 13%, transparent); color: var(--positive); }
.word-pill-badge.broadening { background: color-mix(in srgb, var(--accent) 13%, transparent); color: var(--accent); }
.word-pill-badge.narrowing { background: color-mix(in srgb, var(--neutral) 16%, transparent); color: var(--neutral); }
.word-pill-badge.reappropriation { background: color-mix(in srgb, var(--gold) 12%, transparent); color: var(--gold); }

/* ── Page footer ──────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: 0.78rem;
  max-width: 100%;
}

.site-footer a { color: var(--text-faint); }
.site-footer a:hover { color: var(--text-sub); }
.site-footer-links { display: flex; gap: 1.5rem; }

/* ── About page ───────────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
}

.about-block h3 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.6rem;
}

.about-block p, .about-block li {
  font-size: 0.85rem;
  color: var(--text-sub);
  line-height: 1.7;
}

.about-block ul {
  padding-left: 1.2rem;
}

.about-block ul li + li { margin-top: 0.3rem; }

.cite-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-top: 1rem;
  white-space: pre-wrap;
}

.license-badge {
  display: inline-block;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  border-radius: var(--radius);
  padding: 0.85rem 1.25rem;
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-top: 1rem;
}

.license-badge strong { color: var(--text); }

/* ── Explore page wrapper ─────────────────────────────────────────── */
.explore-header {
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--bg-panel);
}

.explore-header .wordmark {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text);
}

.explore-header .wordmark span { color: var(--accent); }

.explore-back {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-sub);
  text-decoration: none;
}

.explore-back:hover { color: var(--accent-hi); text-decoration: none; }

/* ── Responsive ───────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .drift-card-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .drift-arrow-col { flex-direction: row; justify-content: center; }
  .about-grid { grid-template-columns: 1fr; }
  .site-nav ul li a { padding: 0 0.6rem; font-size: 0.78rem; }
  .hero h1 { font-size: 1.9rem; }
}

@media (max-width: 480px) {
  .site-nav ul { gap: 0; }
  .site-nav ul li a { font-size: 0.72rem; padding: 0 0.4rem; }
  .hero { padding: 3rem 1.25rem 2.5rem; }
  .section, .section-full { padding: 2.5rem 1.25rem; }
}