/* Shared visual foundation for the Alpha public portal. */
:root {
  --bg: oklch(0.973 0.011 88);
  --surface: oklch(0.995 0.004 90);
  --surface-2: oklch(0.955 0.012 90);
  --raised: oklch(0.995 0.004 90);
  --inset: oklch(0.955 0.012 90);
  --line: oklch(0.845 0.018 90);
  --line-2: oklch(0.79 0.022 90);
  --line-soft: oklch(0.905 0.012 90);
  --ink: oklch(0.255 0.025 245);
  --ink-2: oklch(0.395 0.020 245);
  --body: oklch(0.395 0.020 245);
  --muted: oklch(0.52 0.018 245);
  --brand: oklch(0.38 0.085 178);
  --brand-deep: oklch(0.31 0.070 178);
  --up: oklch(0.48 0.120 155);
  --down: oklch(0.49 0.160 30);
  --warn: oklch(0.58 0.120 78);
  --gold: oklch(0.56 0.120 78);
  --blue: oklch(0.48 0.110 245);
  --violet: oklch(0.48 0.120 305);
  --i-jade: oklch(0.38 0.085 178);
  --i-blue: oklch(0.48 0.110 245);
  --i-violet: oklch(0.48 0.120 305);
  --i-pink: oklch(0.58 0.120 78);
  --grad: var(--brand);
  --font: "Noto Sans Thai", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --sans: var(--font);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --radius: 8px;
  --radius-sm: 5px;
  --maxw: 1200px;
}

html { background: var(--bg); }
body { background: var(--bg) !important; background-image: none !important; color: var(--ink); font-family: var(--font); }

.alpha-topbar {
  position: sticky !important;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--line) !important;
  background: color-mix(in oklab, var(--bg) 94%, transparent) !important;
  backdrop-filter: saturate(1.05) blur(8px);
}
.alpha-shell {
  max-width: var(--maxw);
  min-height: 68px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 22px;
}
.alpha-shell > .row { width: 100%; display: flex; align-items: center; }
.alpha-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink) !important;
  font-weight: 700;
  letter-spacing: .015em;
  text-decoration: none;
  white-space: nowrap;
}
.alpha-brand-mark {
  width: 14px;
  height: 14px;
  display: inline-block;
  background: var(--ink);
  box-shadow: 3px -3px 0 var(--surface), 3px -3px 0 1px var(--line);
}
.alpha-brand .alpha-brand-mark {
  border-radius: 0;
  background: var(--ink);
  box-shadow: 3px -3px 0 var(--surface), 3px -3px 0 1px var(--line);
}
.alpha-global-nav {
  min-width: 0;
  margin-left: auto;
  display: flex;
  align-items: stretch;
  gap: 0;
  white-space: nowrap;
}
.alpha-global-nav a,
.alpha-global-nav .nav-active {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  padding: 0 11px;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--ink-2);
  font-size: .84rem;
  font-weight: 500;
  text-decoration: none;
}
.alpha-global-nav a:hover { color: var(--ink); background: var(--surface-2); }
.alpha-global-nav a:focus-visible,
.alpha-brand:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }
.alpha-global-nav .nav-active,
.alpha-global-nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--brand); font-weight: 700; }
.alpha-ver {
  align-self: center;
  margin-left: 8px;
  padding: 4px 7px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-family: var(--mono);
  font-size: .68rem;
  font-variant-numeric: tabular-nums;
}
.proposal-section-nav {
  position: relative !important;
  top: auto !important;
  z-index: 1 !important;
  border-bottom: 1px solid var(--line-soft) !important;
  background: var(--surface) !important;
  backdrop-filter: none !important;
}
.proposal-section-nav .wrap { min-height: 48px; }
.proposal-section-nav nav { overflow-x: auto; scrollbar-width: none; }
.proposal-section-nav nav::-webkit-scrollbar { display: none; }

@media (max-width: 760px) {
  .alpha-shell { min-height: 60px; padding: 0 16px; gap: 14px; }
  .alpha-global-nav { overflow-x: auto; scrollbar-width: none; }
  .alpha-global-nav::-webkit-scrollbar { display: none; }
  .alpha-global-nav a, .alpha-global-nav .nav-active { flex: none; min-height: 48px; padding: 0 10px; }
  .alpha-ver { display: none; }
}