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

:root {
  /* ── Themeable tokens ── */
  --bg:        #20292C;
  --fg:        #FFFFFF;
  --muted:     #999999;
  --dim:       #555555;
  --border:    #616566;
  --ghost-bd:  #828282;
  --swatch-bd: rgba(255, 255, 255, 0.1);
  /* ── Fixed tokens ── */
  --white:    #FFFFFF;
  --accent:   #26ACE8;
  --font-int: 'Inter', sans-serif;
  --font-mon: 'JetBrains Mono', monospace;
}

html[data-theme="light"] {
  --bg:        #FFFFFF;
  --fg:        #1A1A1A;
  --muted:     #666666;
  --dim:       #AAAAAA;
  --border:    #CCCCCC;
  --ghost-bd:  #AAAAAA;
  --swatch-bd: rgba(0, 0, 0, 0.1);
}

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-int);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ─── Layout wrapper ─── */
.guide {
  max-width: 1160px;
  margin: 0 auto;
  padding: 30px 20px 90px 20px;
}

/* ─── Guide header ─── */
.guide-meta {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 72px;
}
.guide-meta__top {
  display: flex;
  align-items: center;
}
.guide-meta__brand {
  display: block;
}
#theme-toggle {
  margin-left: auto;
}
.guide-meta__logo {
  height: 40px;
  width: auto;
  display: block;
}
.guide-meta__label {
  font-family: var(--font-mon);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}

/* ─── Row ─── */
.row {
  display: grid;
  grid-template-columns: 148px 268px 1fr;
  gap: 0 40px;
  padding: 44px 0;
  border-top: 1px solid var(--border);
  align-items: start;
}
.row:last-child {
  border-bottom: 1px solid var(--border);
}

/* label */
.row__label {
  font-family: var(--font-int);
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.4px;
  line-height: 22px;
  padding-top: 3px;
}

/* specs */
.row__specs {
  font-family: var(--font-mon);
  font-size: 10.5px;
  font-weight: 800;
  color: var(--muted);
  letter-spacing: 0.4px;
  line-height: 19px;
  white-space: pre;
}
.row__specs .note {
  color: var(--dim);
}

/* example */
.row__example {
  /* children define their own display rules */
}

/* ════════════════════════════════════════
   TYPOGRAPHY TOKENS
════════════════════════════════════════ */

.t-h1 {
  font-family: var(--font-int);
  font-optical-sizing: auto;
  font-size: 72px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.5px;
  line-height: 70px;
}
.t-h1 .m { color: var(--muted); }

.t-h2 {
  font-family: var(--font-int);
  font-optical-sizing: auto;
  font-size: 48px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.3px;
  line-height: 52px;
}

.t-h3 {
  font-family: var(--font-int);
  font-optical-sizing: auto;
  font-size: 36px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.2px;
  line-height: 40px;
}

.t-h4 {
  font-family: var(--font-int);
  font-optical-sizing: auto;
  font-size: 28px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -0.1px;
  line-height: 34px;
}

.t-h5 {
  font-family: var(--font-int);
  font-size: 20px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: 0px;
  line-height: 26px;
}

.t-h6 {
  font-family: var(--font-int);
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.4px;
  line-height: 22px;
}

.t-lead {
  font-family: var(--font-int);
  font-size: 20px;
  font-weight: 300;
  color: var(--fg);
  letter-spacing: 0.2px;
  line-height: 28px;
}

.t-pullquote {
  font-family: var(--font-int);
  font-size: 20px;
  font-weight: 300;
  font-style: italic;
  color: var(--fg);
  letter-spacing: 0.2px;
  line-height: 28px;
}

.t-body {
  font-family: var(--font-int);
  font-size: 16px;
  font-weight: 400;
  color: var(--fg);
  letter-spacing: 0.4px;
  line-height: 24px;
}

.t-small {
  font-family: var(--font-int);
  font-size: 14px;
  font-weight: 400;
  color: var(--fg);
  letter-spacing: 0.4px;
  line-height: 22px;
}

.t-legal {
  font-family: var(--font-int);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.37px;
  line-height: 18px;
}

.t-eyebrow {
  font-family: var(--font-mon);
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 1px;
  line-height: 18px;
  text-transform: uppercase;
}

/* ════════════════════════════════════════
   BUTTONS
════════════════════════════════════════ */

.btn-pair {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.btn-pair__hover-label {
  font-family: var(--font-mon);
  font-size: 10px;
  font-weight: 600;
  color: var(--dim);
  letter-spacing: 1px;
  text-transform: uppercase;
  align-self: center;
}

.btn {
  font-family: var(--font-mon);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  text-align: center;
  text-transform: uppercase;
  border-radius: 99px;
  padding: 20px 24px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
  line-height: 1;
}

/* Medium size modifier */
.btn-md {
  padding: 14px 22px;
}

/* Small size modifier */
.btn-sm {
  font-size: 11px;
  letter-spacing: 1.5px;
  padding: 8px 16px;
}

/* Primary */
.btn-primary {
  background: var(--accent);
  color: #000000;
  border: 1px solid var(--accent);
}
.btn-primary:hover {
  background: var(--white);
  border-color: var(--white);
}
/* static hover preview */
.btn-primary.is-hover {
  background: var(--white);
  border-color: var(--white);
}

/* Secondary */
.btn-secondary {
  background: var(--white);
  color: #000000;
  border: 1px solid var(--white);
}
.btn-secondary:hover {
  background: var(--accent);
  border-color: var(--accent);
}
.btn-secondary.is-hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* Light mode — secondary inverts to dark fill */
html[data-theme="light"] .btn-secondary {
  background: #1A1A1A;
  color: #FFFFFF;
  border-color: #1A1A1A;
}
html[data-theme="light"] .btn-secondary:hover,
html[data-theme="light"] .btn-secondary.is-hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--ghost-bd);
}
.btn-ghost:hover {
  border-color: var(--fg);
}
/* static hover preview */
.btn-ghost.is-hover {
  border-color: var(--fg);
}

/* Light mode — primary button default: white text */
html[data-theme="light"] .btn-primary {
  color: #FFFFFF;
}

/* Light mode — primary button hover goes dark */
html[data-theme="light"] .btn-primary:hover,
html[data-theme="light"] .btn-primary.is-hover {
  background: #1A1A1A;
  border-color: #1A1A1A;
  color: #FFFFFF;
}

/* ════════════════════════════════════════
   NAV TOKENS
════════════════════════════════════════ */

.nav-pair {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-main {
  font-family: var(--font-mon);
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 1px;
  line-height: 18px;
  text-transform: uppercase;
  padding: 14px 22px;
  border-radius: 99px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-block;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.nav-main:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.nav-main.is-hover {
  color: var(--accent);
  border-color: var(--accent);
}

.nav-footer {
  font-family: var(--font-mon);
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 1px;
  line-height: 14px;
  text-transform: uppercase;
  padding: 6px 0px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-block;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.nav-footer:hover {
  color: var(--accent);
}
.nav-footer.is-hover {
  color: var(--accent);
}

/* ════════════════════════════════════════
   COLOR SWATCHES
════════════════════════════════════════ */

.swatches {
  display: flex;
  column-gap: 12px;
  row-gap: 24px;
  flex-wrap: wrap;
  align-items: flex-start;
}

.swatch {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100px;
}

.swatch__color {
  width: 100px;
  height: 72px;
  border-radius: 8px;
  border: 1px solid var(--swatch-bd);
}

.swatch__meta {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.swatch__name {
  font-family: var(--font-mon);
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  line-height: 14px;
}

.swatch__hex {
  font-family: var(--font-mon);
  font-size: 11px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: 0.5px;
  line-height: 16px;
}

/* ─── Hover-state annotation ─── */
.state-stack {
  display: flex;
  flex-direction: column;
  gap: 0px;
}
.state-row {
  display: flex;
  align-items: center;
  gap: 0px;
}
.state-tag {
  font-family: var(--font-mon);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--dim);
  min-width: 52px;
}

/* ════════════════════════════════════════
   RESPONSIVE
════════════════════════════════════════ */

/* ── Tablet (≤ 900px): label spans full width,
      specs + example sit side-by-side below it ── */
@media (max-width: 900px) {

  .row {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "label  label"
      "specs  example";
    gap: 20px 40px;
    padding: 36px 0;
  }
  .row__label   { grid-area: label;   }
  .row__specs   { grid-area: specs;   }
  .row__example { grid-area: example; }

  /* allow spec text to wrap on narrower columns */
  .row__specs { white-space: pre-wrap; word-break: break-word; }

  /* scale large display type */
  .t-h1 { font-size: 52px; line-height: 54px; }
  .t-h2 { font-size: 38px; line-height: 42px; }
  .t-h3 { font-size: 28px; line-height: 32px; }
  .t-h4 { font-size: 22px; line-height: 28px; }

  /* tighten body-scale type */
  .t-lead, .t-pullquote { line-height: 26px; }

  /* guide header */
  .guide-meta { margin-bottom: 48px; }

}

/* ── Mobile (≤ 600px): fully single-column ── */
@media (max-width: 600px) {

  .guide { padding: 24px 16px 64px; }

  .row {
    grid-template-columns: 1fr;
    grid-template-areas:
      "label"
      "specs"
      "example";
    gap: 16px;
    padding: 28px 0;
  }

  /* scale display type down further */
  .t-h1 { font-size: 36px; line-height: 38px; }
  .t-h2 { font-size: 28px; line-height: 32px; }
  .t-h3 { font-size: 22px; line-height: 26px; }
  .t-h4 { font-size: 18px; line-height: 24px; }

  /* tighten body-scale type */
  .t-lead, .t-pullquote { line-height: 26px; }

  /* tighter swatches */
  .swatches { gap: 8px; }
  .swatch   { width: 76px; }
  .swatch__color { width: 76px; height: 56px; }

  /* keep buttons from overflowing */
  .btn { white-space: nowrap; }
  .state-stack { gap: 12px; }

  /* guide header */
  .guide-meta { gap: 16px; margin-bottom: 40px; }

}