/* Frostpunk home menu — Icy Peaks scheme (shared palette, see wargame §1) */

:root {
  /* Backdrop */
  --ice-light: #dcebf4;
  --ice-mid: #b9d2e2;
  --crag: #2e3d4a;
  /* Parchment UI */
  --parchment: #f2e8d0;
  --parchment-light: #f7f0dd;
  --ink: #2e2116;
  /* Chrome */
  --chrome: #3a2b1e;
  --chrome-text: #f2e8d0;
  /* Pops */
  --amber: #e8940a;
  --gold: #b89b2e;
  --copper: #8a5a30;
  /* Focus */
  --focus-frost: #dcebf4;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--chrome-text);
  background: var(--crag);
  display: flex;
  flex-direction: column;
}

/* ---- Backdrop tier 1: painted icy peaks via layered gradients ---- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    /* crag silhouettes */
    linear-gradient(160deg, transparent 55%, rgba(46, 61, 74, 0.85) 56%, rgba(46, 61, 74, 0.95) 100%),
    linear-gradient(200deg, transparent 60%, rgba(46, 61, 74, 0.6) 61%, rgba(46, 61, 74, 0.9) 100%),
    /* pale ice sky */
    radial-gradient(ellipse at 50% 20%, var(--ice-light) 0%, var(--ice-mid) 45%, #7f99ac 75%, var(--crag) 100%);
}

/* soft amber generator glow low in frame */
.glow {
  position: absolute;
  left: 50%;
  bottom: -12%;
  width: 70vmin;
  height: 40vmin;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(232, 148, 10, 0.35) 0%, rgba(232, 148, 10, 0.12) 45%, transparent 70%);
  pointer-events: none;
}

/* ---- Backdrop tier 2: snow (transform/opacity only) ---- */
.snow { position: absolute; inset: 0; overflow: hidden; }
.flake {
  position: absolute;
  top: -6px;
  border-radius: 50%;
  background: #fff;
  will-change: transform;
}
@media (prefers-reduced-motion: no-preference) {
  .flake { animation: fall linear infinite; }
  @keyframes fall {
    from { transform: translate3d(0, -2vh, 0); }
    to   { transform: translate3d(4vw, 104vh, 0); }
  }
}

/* ---- Header ---- */
.site-header {
  text-align: center;
  padding: 12vh 1rem 4vh;
  /* pale frost halo so dark ink stays crisp over crag silhouettes too */
  text-shadow: 0 1px 10px rgba(247, 240, 221, 0.55);
}
.kicker {
  margin: 0 0 0.25rem;
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink);
}
.game-title {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.5rem, 10vw, 5rem);
  letter-spacing: 0.12em;
  color: var(--ink);
}
.subtitle {
  margin: 0.5rem 0 0;
  font-style: italic;
  font-family: Georgia, serif;
  color: var(--ink);
}

/* ---- Menu ---- */
main { flex: 1; display: flex; justify-content: center; padding: 0 1rem; }
.menu {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  width: 100%;
  max-width: 26rem;
}
.menu-btn {
  display: block;
  min-height: 48px;
  padding: 0.85rem 1.25rem;
  background: var(--parchment);
  color: var(--ink);
  text-decoration: none;
  border: 2px solid var(--chrome);
  border-radius: 6px;
  box-shadow: 0 3px 0 var(--chrome), 0 6px 18px rgba(46, 61, 74, 0.35);
  transition: transform 120ms ease, box-shadow 120ms ease;
}
.menu-btn:hover { background: var(--parchment-light); transform: translateY(-2px); }
.menu-btn:active { transform: translateY(1px); box-shadow: 0 1px 0 var(--chrome); }
.menu-btn:focus-visible {
  outline: 3px solid var(--focus-frost);
  outline-offset: 3px;
}
.menu-label {
  display: block;
  font-family: Georgia, serif;
  font-size: 1.25rem;
  font-weight: 700;
}
.menu-sub {
  display: block;
  font-size: 0.85rem;
  color: var(--copper);
}

/* ---- Footer ---- */
.site-footer {
  margin-top: 4vh;
  padding: 0.9rem 1rem;
  background: var(--chrome);
  color: var(--chrome-text);
  text-align: center;
  font-size: 0.85rem;
}
.site-footer p { margin: 0; }