/* ──────────────────────────────────────────────
   Nezr Kaan — base.css
   Shared across all pages (home, archive, articles)
   Theme variables · reset · header · footer · theme toggle
   ────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #EDE6D0;
  --bg-elevated: #F4EFE1;
  --text: #201C18;
  --text-muted: #5C5148;
  --text-faint: #9A8C7E;
  --border: #CEC3AB;
  --border-strong: #A8987E;
  --accent-purple: #5E3FA3;
  --accent-orange: #B85A28;

  --serif: 'Newsreader', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  --t: 0.3s ease;
}

html[data-theme="dark"] {
  --bg: #1D1A15;
  --bg-elevated: #252119;
  --text: #EDE6D0;
  --text-muted: #B8AE9A;
  --text-faint: #8F8678;
  --border: #3A342B;
  --border-strong: #5C5148;
  --accent-purple: #9278D9;
  --accent-orange: #D68357;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.75;
  font-feature-settings: "onum" 1, "liga" 1;
  font-variation-settings: "opsz" 16;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  min-height: 100dvh;
  transition: background var(--t), color var(--t);
  overflow-x: hidden;
}

::selection { background: var(--accent-purple); color: var(--bg); }

/* ─── HEADER ─── */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: background var(--t), border-color var(--t);
}

.header-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 1.1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-mark {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
  transition: color var(--t);
  white-space: nowrap;
}
.site-mark:hover { color: var(--accent-purple); }
.site-mark .dim { color: var(--text-faint); }

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--t);
  white-space: nowrap;
  padding: 0.4rem 0;
  position: relative;
}
.nav-link:hover { color: var(--accent-purple); }
.nav-link.active { color: var(--text); }
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--accent-orange);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-strong);
  background: transparent;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  transition: border-color var(--t), color var(--t), transform var(--t);
  flex-shrink: 0;
}
.theme-toggle:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
  transform: rotate(15deg);
}
.theme-toggle svg { width: 15px; height: 15px; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ─── LAYOUT ─── */
.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ─── FOOTER ─── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 3rem;
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--t);
}
footer a:hover { color: var(--accent-orange); }

/* ─── MOBILE ─── */
@media (max-width: 600px) {
  body { font-size: 17px; }
  .header-inner { padding: 0.9rem 1.75rem; }
  .container { padding: 0 1.75rem; }
  .site-mark { font-size: 0.65rem; letter-spacing: 0.15em; }
  .header-nav { gap: 0.85rem; }
  .nav-link { font-size: 0.62rem; letter-spacing: 0.12em; padding: 0.3rem 0; }
  .theme-toggle { width: 38px; height: 38px; }
}

@media (max-width: 380px) {
  .header-nav { gap: 0.6rem; }
  .nav-link { font-size: 0.56rem; }
}

/* ─── SHARED KEYFRAMES ─── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .theme-toggle:hover { transform: none; }
}