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

:root {
  --bg:      #0f0f13;
  --surface: #1a1a24;
  --border:  #2a2a38;
  --text:    #e8e8f0;
  --muted:   #888;
  --accent:  #6c6cff;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Nav ─────────────────────────────────────────────── */

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0 1.5rem;
  height: 48px;
  background: #13131a;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.site-nav__brand {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
}

.site-nav__brand:hover { color: #fff; }

.site-nav__links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.site-nav__links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
}

.site-nav__links a:hover { color: var(--text); }

/* ── Screens ─────────────────────────────────────────── */

.screen { display: none; flex: 1; }
.screen.active { display: flex; }

/* ── Menu ────────────────────────────────────────────── */

#screen-menu {
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.menu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: 1.4rem;
}

.menu-card h1 { font-size: 2rem; }
.subtitle { color: var(--muted); font-size: 0.95rem; }

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field-group label { font-size: 0.85rem; color: var(--muted); }

.btn-group {
  display: flex;
  gap: 0.4rem;
}

.tog {
  flex: 1;
  padding: 0.4rem 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
}

.tog.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

input[type=range] {
  width: 100%;
  accent-color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
}

.btn-primary:hover { background: #8080ff; }

.btn-secondary {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  width: 100%;
}

.btn-secondary:hover { color: var(--text); border-color: var(--text); }

/* ── Game screen ─────────────────────────────────────── */

#screen-game {
  flex-direction: column;
  overflow: hidden;
}

#game-ui {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: #13131a;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 1rem;
}

#hud {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
  align-items: center;
}

#hud-cats { color: #f87;  }

#hud-right {
  display: flex;
  gap: 0.5rem;
}

.btn-sm {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
  font-family: inherit;
  cursor: pointer;
}

.btn-sm:hover { border-color: var(--accent); color: var(--accent); }

#canvas-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0.75rem;
}

#canvas {
  display: block;
  border: 2px solid var(--border);
  border-radius: 4px;
  image-rendering: pixelated;
}

#hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  padding: 0.4rem;
  flex-shrink: 0;
}

/* ── Overlays ────────────────────────────────────────── */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.overlay.hidden { display: none; }

.overlay-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 280px;
}

.overlay-box h2 { font-size: 1.8rem; }
.overlay-box p  { color: var(--muted); }