/* Design tokens, reset, typography and layout primitives. */
:root {
  --paper: #f3ead7;
  --paper-dark: #e6d9bd;
  --ink: #2b2520;
  --ink-soft: #5d544b;
  --muted: #7b7166;
  --line: #d6c7a8;
  --card: #fffdf7;
  --accent: #c2410c;
  --accent-ink: #ffffff;
  --accent-soft: #fde7d6;
  --focus: #1d4ed8;
  --ok: #166534;
  --ok-soft: #dcfce7;
  --err: #b91c1c;
  --err-soft: #fee2e2;
  --info-soft: #e0ecff;

  --note-yellow: #fff3a3;
  --note-pink: #ffd3e1;
  --note-blue: #cfe6ff;
  --note-green: #d6f5c9;
  --note-orange: #ffdcb3;
  --note-purple: #e6d8ff;

  --radius: 10px;
  --radius-small: 6px;
  --shadow: 0 1px 2px rgba(43, 37, 32, 0.12), 0 6px 16px rgba(43, 37, 32, 0.08);
  --shadow-note: 0 2px 3px rgba(43, 37, 32, 0.18), 0 10px 18px rgba(43, 37, 32, 0.12);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --max: 1200px;
  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-note: ui-rounded, "SF Pro Rounded", "Nunito", "Segoe UI", system-ui, sans-serif;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(rgba(120, 90, 40, 0.06) 1px, transparent 1px),
    radial-gradient(rgba(120, 90, 40, 0.04) 1px, transparent 1px);
  background-size: 22px 22px, 37px 37px;
  background-position: 0 0, 11px 17px;
  display: flex;
  flex-direction: column;
}

main { flex: 1; width: 100%; max-width: var(--max); margin: 0 auto; padding: var(--space-5) var(--space-4) var(--space-7); }
main:focus { outline: none; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 var(--space-3); }
h2 { font-size: 1.2rem; }
h3 { font-size: 1rem; margin-top: var(--space-4); }
p { margin: 0 0 var(--space-3); }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; }
code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
/* Headings receive programmatic focus on navigation (for screen readers); no ring. */
[tabindex="-1"]:focus { outline: none; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip-link { position: absolute; left: -999px; top: 0; z-index: 100; background: var(--card); padding: var(--space-2) var(--space-3); }
.skip-link:focus { left: var(--space-3); top: var(--space-3); }

[hidden] { display: none !important; }

.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.stack > * + * { margin-top: var(--space-3); }
.row { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.row--tight { gap: var(--space-1); }
.narrow { max-width: 640px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.card--wide { grid-column: 1 / -1; }
.plain-list { list-style: none; padding: 0; margin: 0; }
.plain-list > li { padding: var(--space-2) 0; border-bottom: 1px dashed var(--line); }
.plain-list > li:last-child { border-bottom: 0; }

.boot { color: var(--muted); text-align: center; padding: var(--space-7) 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}