:root {
  color-scheme: dark;

  /* Shared UI palette */
  --color-bg: #060608;
  --color-surface: #0d0d10;
  --color-surface-raised: #131318;
  --color-glass-solid: rgba(6, 6, 8, .97);
  --color-border: #1c1c24;
  --color-border-strong: #242430;
  --color-text-dim: #383848;
  --color-text-muted: #6b6b7b;
  --color-text: #c8c8d8;
  --color-text-strong: #e8e8f0;
  --color-accent: #00ff96;
  --color-accent-soft: rgba(0, 255, 150, .04);
  --color-accent-border: rgba(0, 255, 150, .38);
  --color-warning: #ffa000;
  --color-danger: #ff617c;

  /* Three-role type system */
  --font-display: 'Syne', sans-serif;
  --font-ui: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Noto Sans CJK SC', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, Consolas, monospace;

  /* Shared content scale */
  --type-section-title: 60px;
  --type-feature-title: 48px;
  --type-card-title: 24px;
  --type-card-compact: 18px;
  --type-card-body: 13px;
  --type-reading: 16px;
  --type-meta: 11px;

  /* Backward-compatible aliases used by existing page styles */
  --bg: var(--color-bg);
  --bg2: var(--color-surface);
  --bg3: var(--color-surface-raised);
  --surface: var(--color-surface);
  --surface-2: var(--color-surface-raised);
  --line: var(--color-border);
  --line2: var(--color-border-strong);
  --muted: var(--color-text-dim);
  --mid: var(--color-text-muted);
  --text: var(--color-text);
  --bright: var(--color-text-strong);
  --green: var(--color-accent);
  --green-bg: var(--color-accent-soft);
  --mono: var(--font-mono);
  --sans: var(--font-ui);
  --syne: var(--font-display);
  --display: var(--font-display);
  --serif: var(--font-ui);
}

/* Shared brand lockups */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--bright);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .12em;
  line-height: 1;
  text-decoration: none;
  text-transform: lowercase;
  transition: color .2s ease;
}

.brand-lockup img {
  width: 32px;
  height: 32px;
  display: block;
  flex: 0 0 32px;
  object-fit: contain;
  transition: transform .2s ease;
}

.brand-lockup:is(:hover, :focus-visible) { color: var(--green); }
.brand-lockup:is(:hover, :focus-visible) img { transform: scale(1.04); }

.brand-lockup:focus-visible {
  outline: 1px solid var(--green);
  outline-offset: 4px;
}

.site-logo.brand-lockup {
  position: fixed;
  top: max(18px, env(safe-area-inset-top));
  left: clamp(20px, 3vw, 48px);
  z-index: 1300;
  min-width: 44px;
  min-height: 44px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .08em;
  text-shadow: 0 2px 16px rgba(6, 6, 8, .88);
  transition: color .2s ease, transform .2s ease;
}

.site-logo.brand-lockup:is(:hover, :focus-visible) { transform: translateY(-1px); }

.brand-lockup--muted {
  flex: 0 0 auto;
  gap: 8px;
  color: var(--mid);
  font-size: 12px;
  font-weight: 600;
  opacity: .72;
}

.brand-lockup--muted img {
  width: 24px;
  height: 24px;
  flex-basis: 24px;
  filter: grayscale(1) saturate(0);
  opacity: .5;
}

.brand-lockup--muted:is(:hover, :focus-visible) {
  color: var(--text);
  opacity: .88;
}

.brand-lockup--muted:is(:hover, :focus-visible) img {
  transform: none;
  opacity: .68;
}

.site-footer-layout {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.site-footer-copy {
  margin: 0;
  color: var(--mid);
  font: 400 var(--type-meta)/1.4 var(--font-mono);
  letter-spacing: .1em;
  text-align: right;
}

.public-footer {
  box-sizing: border-box;
  padding: 32px clamp(24px, 6vw, 96px) 40px;
  background: var(--bg2);
  border-top: 1px solid var(--line);
}

.public-footer--full-bleed {
  position: relative;
  left: 50%;
  width: 100vw;
  margin-left: -50vw;
}

@media (max-width: 1099px) {
  :root {
    --type-section-title: clamp(40px, 5vw, 60px);
    --type-feature-title: 40px;
    --type-card-title: 22px;
  }
}

@media (max-width: 640px) {
  :root {
    --type-section-title: clamp(36px, 9.5vw, 42px);
    --type-feature-title: 32px;
    --type-card-title: 20px;
  }

  .brand-lockup { gap: 8px; font-size: 13px; }
  .brand-lockup img { width: 28px; height: 28px; flex-basis: 28px; }
  .site-logo.brand-lockup {
    top: max(10px, env(safe-area-inset-top));
    left: 16px;
    font-size: 15px;
  }
  .brand-lockup--muted { gap: 7px; font-size: 11px; }
  .brand-lockup--muted img { width: 21px; height: 21px; flex-basis: 21px; }
  .site-footer-layout { gap: 14px; }
  .site-footer-copy { max-width: 28ch; font-size: 10px; }
  .public-footer { padding: 28px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .brand-lockup,
  .brand-lockup img { transition: none; }
}