/* ═══════════════════════════════════════════════
   GAME OF LIFE — STYLESHEET
   Aesthetic: Industrial Brutalist / Monochrome
   ═══════════════════════════════════════════════ */

/* ── TOKENS ─────────────────────────────── */
:root {
  --cell-alive:   #0a0a0a;
  --cell-dead:    #f5f4f0;
  --grid-line:    rgba(0,0,0,0.07);

  --bg:           #ede9e3;
  --sidebar-bg:   #1a1a1a;
  --sidebar-txt:  #f0ede8;
  --sidebar-dim:  #888;
  --accent:       #e8ff3a;
  --accent-dark:  #b8cc00;
  --danger:       #ff4545;
  --border:       rgba(255,255,255,0.08);

  --font-display: 'Syne', sans-serif;
  --font-mono:    'Space Mono', monospace;

  --sidebar-w:    260px;
  --panel-gap:    1.5rem;
  --radius:       2px;
  --transition:   0.18s ease;
}

body.dark {
  --cell-alive:   #f5f4f0;
  --cell-dead:    #0a0a0a;
  --grid-line:    rgba(255,255,255,0.05);
  --bg:           #0a0a0a;
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  font-family: var(--font-mono);
}

/* ── LAYOUT ─────────────────────────────── */
body {
  display: flex;
  background: var(--bg);
  transition: background var(--transition);
}

/* ── SIDEBAR ────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100vh;
  background: var(--sidebar-bg);
  color: var(--sidebar-txt);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: #333 transparent;
  z-index: 10;
  border-right: 3px solid var(--accent);
}

#sidebar::-webkit-scrollbar { width: 4px; }
#sidebar::-webkit-scrollbar-thumb { background: #333; }

/* Logo */
.logo {
  padding: 1.4rem 1.2rem 1rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-symbol {
  font-size: 1.8rem;
  line-height: 1;
  filter: drop-shadow(0 0 8px var(--accent));
}

.logo h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--accent);
}

/* Panels */
.panel {
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.panel-title {
  font-family: var(--font-display);
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--sidebar-dim);
  font-weight: 700;
  margin-bottom: 0.1rem;
}

/* ── BUTTONS ────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #000;
}
.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: transparent;
  color: var(--sidebar-txt);
  border: 1px solid rgba(255,255,255,0.2);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--sidebar-dim);
  border: 1px solid rgba(255,255,255,0.08);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: var(--sidebar-txt);
}

.btn-row {
  display: flex;
  gap: 0.5rem;
}

.full-width { width: 100%; }

/* File label as button */
.file-label {
  text-align: center;
  cursor: pointer;
}

/* ── SLIDERS ────────────────────────────── */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.slider-group label {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--sidebar-dim);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform var(--transition);
}
input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

/* ── STATS ──────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.stat-box {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius);
  padding: 0.6rem 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.stat-wide {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius);
  padding: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-label {
  font-size: 0.56rem;
  letter-spacing: 0.14em;
  color: var(--sidebar-dim);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.stat-value.small { font-size: 0.72rem; }

/* ── SELECT ─────────────────────────────── */
.select-field {
  width: 100%;
  background: rgba(255,255,255,0.05);
  color: var(--sidebar-txt);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition);
}
.select-field:focus {
  border-color: var(--accent);
}
.select-field option, .select-field optgroup {
  background: #1e1e1e;
  color: #f0ede8;
}

/* ── THEME TOGGLE ───────────────────────── */
.theme-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.2rem;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--sidebar-dim);
  border-bottom: 1px solid var(--border);
}

.theme-toggle {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50%;
  width: 2rem; height: 2rem;
  font-size: 1rem;
  color: var(--accent);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
  transform: rotate(30deg);
}

/* ── LOGO CANVAS ────────────────────────── */
#logo-canvas {
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 3px;
  flex-shrink: 0;
}

/* ── PATTERN PREVIEW ────────────────────── */
#pattern-preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  background: rgba(0,0,0,0.25);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 0.5rem;
  min-height: 106px;
}

#pattern-preview {
  display: block;
  border-radius: 1px;
  width: 100%;
  height: 90px;
  object-fit: contain;
}

#pattern-preview-name {
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-align: center;
  min-height: 0.9em;
}

/* ── HELP HINT ──────────────────────────── */
.help-hint {
  margin-top: auto;
  padding: 0.8rem 1.2rem 1.4rem;
  border-top: 1px solid var(--border);
}

.help-title {
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--sidebar-dim);
  margin-bottom: 0.6rem;
}

.help-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.28rem 0.6rem;
  align-items: center;
}

.help-grid span {
  font-size: 0.6rem;
  color: #666;
  letter-spacing: 0.03em;
}

kbd {
  display: inline-block;
  background: #2a2a2a;
  border: 1px solid #3a3a3a;
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 0.08em 0.4em;
  font-family: var(--font-mono);
  font-size: 0.56rem;
  color: #ccc;
  white-space: nowrap;
  justify-self: start;
}

/* ── CANVAS AREA ────────────────────────── */
#canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--cell-dead);
  transition: background var(--transition);
}

#life-canvas {
  display: block;
  position: absolute;
  top: 0; left: 0;
  /* cursor set by JS */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* ── HUD ────────────────────────────────── */
#hud {
  position: absolute;
  top: 1rem; right: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  pointer-events: none;
}

#hud-gen {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--sidebar-bg);
  background: rgba(255,255,255,0.7);
  padding: 0.25rem 0.65rem;
  border-radius: 2px;
  backdrop-filter: blur(4px);
}

body.dark #hud-gen {
  color: var(--accent);
  background: rgba(0,0,0,0.6);
}

.mode-badge {
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  padding: 0.25rem 0.55rem;
  border-radius: 2px;
  background: var(--accent);
  color: #000;
}
.mode-badge.pan { background: #4af; color: #000; }

/* ── TOAST ──────────────────────────────── */
#toast {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--sidebar-bg);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  white-space: nowrap;
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── MODAL ──────────────────────────────── */
#modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(3px);
}
#modal-overlay[hidden] { display: none !important; }

#modal {
  background: #1a1a1a;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: min(560px, 90vw);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#modal-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  color: var(--accent);
}

#modal-text {
  width: 100%;
  height: 200px;
  background: #111;
  color: #ccc;
  border: 1px solid #333;
  border-radius: var(--radius);
  padding: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  resize: vertical;
  outline: none;
}

/* ── TRANSFORM CONTROLS ─────────────────── */
.transform-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: wrap;
}

.transform-row label {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--sidebar-dim);
  width: 100%;
  margin-bottom: 0.1rem;
}

.btn-icon {
  flex: 1;
  min-width: 0;
  padding: 0.45rem 0.3rem;
  font-size: 0.85rem;
  background: rgba(255,255,255,0.05);
  color: var(--sidebar-txt);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.btn-icon:hover {
  background: rgba(255,255,255,0.12);
  border-color: var(--accent);
  color: var(--accent);
}
.btn-icon.active {
  background: var(--accent);
  color: #000;
  border-color: var(--accent);
}

.rotation-display {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent);
  text-align: center;
  letter-spacing: 0.06em;
}

.place-mode-hint {
  font-size: 0.6rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-align: center;
  animation: pulse 1s infinite;
  display: none;
}
.place-mode-hint.visible { display: block; }

/* ── RESPONSIVE ─────────────────────────── */
@media (max-width: 640px) {
  :root { --sidebar-w: 220px; }
  .logo h1 { font-size: 0.9rem; }
}

/* ── ANIMATION ──────────────────────────── */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
#btn-play.running #play-icon {
  display: inline-block;
  animation: pulse 1s infinite;
}

/* ── SCROLLBAR (CANVAS AREA) ────────────── */
#canvas-area::-webkit-scrollbar { display: none; }