/* ============================================================
   ALTERRELL DESIGN SYSTEM v2
   Shared across: index.html · about.html · reading.html
   ============================================================ */

:root {
  --bg:         #0a0a0a;
  --bg-card:    #111111;
  --bg-card-h:  #171717;
  --bg-btn:     #1a1a1a;
  --bg-btn-h:   #222222;
  --rule:       #1e1e1e;
  --rule-mid:   #2a2a2a;
  --rule-light: #333333;

  --ink:        #f8f6f1;
  --ink-2:      #c8c5bf;
  --ink-3:      #8a8780;
  --ink-4:      #555250;

  --c-i:  #0a7c72;
  --c-m:  #2B6CB0;
  --c-s:  #c95f1a;

  --font-mono: 'DM Mono', 'Fira Code', monospace;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-edit: 'DM Serif Display', Georgia, serif;

  --rad:  6px;
  --radc: 8px;
  --t:    0.18s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* ── NAV ── */
.a-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 52px;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
}
.a-nav-mark {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink);
  transition: color var(--t);
}
.a-nav-mark:hover { color: var(--ink-2); }

.a-nav-links {
  display: flex;
  gap: 2.25rem;
  align-items: center;
}
.a-nav-links a {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  transition: color var(--t);
}
.a-nav-links a:hover { color: var(--ink); }
.a-nav-links a.active { color: var(--ink); }

/* ── PAGE OFFSET ── */
.a-page { padding-top: 52px; flex: 1; }

/* ── FOOTER ── */
.a-footer {
  border-top: 1px solid var(--rule);
  padding: 2rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.a-footer-links {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}
.a-footer a {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  transition: color var(--t);
}
.a-footer a:hover { color: var(--ink); }
.a-footer-url {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.14em;
  color: var(--ink-4);
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-1 { animation: fadeUp 0.75s ease both; }
.fade-2 { animation: fadeUp 0.75s 0.08s ease both; }
.fade-3 { animation: fadeUp 0.75s 0.16s ease both; }
.fade-4 { animation: fadeUp 0.75s 0.24s ease both; }

/* ── MOBILE ── */
@media (max-width: 700px) {
  .a-nav { padding: 0 1.25rem; }
  .a-nav-links { gap: 1.25rem; }
  .a-footer { padding: 1.5rem 1.25rem; flex-direction: column; align-items: flex-start; }
}