/* ── Variables ─────────────────────────────────────────── */
:root {
  --bg:    #ffffff;
  --ink:   #1a1916;
  --muted: #7a7570;
  --mark:  #d0cdc8;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:    #0f0f0f;
    --ink:   #ece8df;
    --muted: #7a7570;
    --mark:  #2a2a2a;
  }
}

[data-theme="dark"] {
  --bg:    #0f0f0f;
  --ink:   #ece8df;
  --muted: #7a7570;
  --mark:  #2a2a2a;
}

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

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 300;
  transition: background 0.4s, color 0.4s;
}

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--muted);
}

/* ── Nav ───────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 20px 40px;
  border-bottom: 1px solid var(--mark);
  background: var(--bg);
  transition: background 0.4s, border-color 0.4s;
  z-index: 10;
}

nav a {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--muted);
  transition: color 0.2s;
}

nav a:hover,
nav a.active {
  color: var(--ink);
}

/* ── Page container ────────────────────────────────────── */
.page {
  max-width: 700px;
  margin: 0 auto;
  padding: 120px 40px 80px;
}

/* ── Theme toggle ──────────────────────────────────────── */
.toggle {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  background: none;
  border: none;
  cursor: pointer;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.52rem;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--muted);
  padding: 4px 0;
  transition: color 0.2s;
}

.toggle:hover { color: var(--ink); }