:root {
  --bg:           #fafcf6;
  --bg-warm:      #f0f4e8;
  --ink:          #1a241e;
  --ink-soft:     #4e5b50;
  --ink-faint:    #8a978e;
  --rule:         #d4ddc8;
  --rule-soft:    #e4ebda;
  --accent:       #4d8c5a;
  --accent-soft:  #7aaf86;
  --accent-tint:  #e3efd9;
  --card:         #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Newsreader', Georgia, serif;
  font-size: 16.5px;
  line-height: 1.65;
  font-weight: 380;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-image:
    radial-gradient(ellipse 80% 50% at 80% 0%, rgba(122, 175, 134, 0.10) 0%, transparent 60%),
    radial-gradient(ellipse 100% 60% at 0% 100%, rgba(77, 140, 90, 0.06) 0%, transparent 55%);
  background-attachment: fixed;
  min-height: 100vh;
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

/* ============ TAB NAV (shell) ============ */
nav.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 500;
}

nav.tabs a {
  color: var(--ink-faint);
  text-decoration: none;
  padding: 12px 0;
  margin-bottom: -1px;
  border-bottom: 1.5px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

nav.tabs a:hover {
  color: var(--ink-soft);
}

nav.tabs a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

nav.tabs a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (min-width: 640px) {
  body { font-size: 17px; }
  .page { padding: 56px 36px 100px; }
  nav.tabs {
    font-size: 11px;
    gap: 32px;
    margin-bottom: 40px;
  }
}

@media (min-width: 900px) {
  body { font-size: 18px; }
  .page { padding: 80px 56px 120px; }
}

@media print {
  body { background: white; background-image: none; }
  .page { padding: 24px; max-width: 100%; }
  nav.tabs { display: none; }
}