/* ============================================================
   Artemis — System
   Typography, layout primitives, components.
   Depends on tokens.css.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,300;8..60,400;8..60,500;8..60,600&family=Inter+Tight:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

html, body {
  margin: 0;
  background: var(--atlas-paper);
  color: var(--atlas-ink);
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--atlas-accent); color: #fff; }

.shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--s-7);
}

a { color: var(--atlas-ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--atlas-rule-soft); }
a:hover { text-decoration-color: var(--atlas-ink); }

/* ---------- SITE NAV ---------- */
.site-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--s-4) var(--s-7);
  border-bottom: 1px solid var(--atlas-rule-soft);
  background: var(--atlas-paper);
  position: relative;
  z-index: 10;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--serif); font-style: italic; font-weight: 500;
  font-size: 22px; letter-spacing: -.005em;
  text-decoration: none;
}
.brand .mark {
  width: 22px; height: 22px; border-radius: 5px;
  background: linear-gradient(135deg, var(--atlas-ink) 0 50%, var(--atlas-accent-2) 50% 100%);
  display: inline-block;
}
.site-nav .links {
  display: flex; gap: var(--s-5);
  font-family: var(--mono); font-size: 12px;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--atlas-muted);
}
.site-nav .links a { color: inherit; text-decoration: none; }
.site-nav .links a:hover, .site-nav .links a[aria-current="page"] { color: var(--atlas-ink); }

/* ---------- THEME TOGGLE ---------- */
.theme-toggle .sun  { display: none; }
.theme-toggle .moon { display: block; }
[data-theme="dark"] .theme-toggle .sun  { display: block; }
[data-theme="dark"] .theme-toggle .moon { display: none; }

:focus-visible {
  outline: 2px solid var(--atlas-accent);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* ---------- MOBILE NAV ---------- */
@media (max-width: 768px) {
  .site-nav {
    flex-wrap: wrap;
    padding: var(--s-3) var(--s-4);
    gap: var(--s-2);
  }
  .site-nav .links {
    gap: var(--s-3);
    flex-wrap: wrap;
    order: 3;
    width: 100%;
    padding-top: var(--s-2);
    border-top: 1px solid var(--atlas-rule-soft);
    font-size: 10px;
  }
  .brand { font-size: 18px; }
}

@media print {
  body { background: #fff; color: #000; }
  .no-print { display: none !important; }
}