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

:root {
  --navy:        #0f1b2d;
  --navy-mid:    #162033;
  --navy-light:  #1e2f47;
  --border:      #2a3f5a;
  --text:        #e0e8f0;
  --muted:       #7a92a8;
  --accent:      #4d79ff;
  --orange:      #f0ad4e;
  --red:         #e84040;
  --red-bg:      rgba(232,64,64,0.12);
  --red-border:  rgba(232,64,64,0.45);
  --blue:        #4488ff;
  --blue-bg:     rgba(68,136,255,0.12);
  --blue-border: rgba(68,136,255,0.45);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--navy);
  color: var(--text);
  min-height: 100vh;
}

/* ── Layout ─────────────────────────────────────────────────────── */

main {
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

/* ── Settings card ──────────────────────────────────────────────── */

#settings-screen { width: 100%; max-width: 560px; }

.game-title {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1.2rem;
}

.card {
  background: var(--navy-mid);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.8rem;
}

.card h2 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.1rem 0.2rem;
  transition: color 0.2s;
}
.btn-close:hover { color: var(--text); }

.field { margin-bottom: 1.5rem; }

.field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.55rem;
}

/* ── Slider ──────────────────────────────────────────────────────── */

.slider-wrap { margin-top: 0.3rem; }

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
  height: 6px;
  display: block;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.82rem;
}

#cols-display, #size-display {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

/* ── Radio ───────────────────────────────────────────────────────── */

.radio-group { display: flex; flex-wrap: wrap; gap: 0.45rem 1.2rem; }

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
}
.radio-label input[type="radio"] { accent-color: var(--accent); width: 15px; height: 15px; cursor: pointer; }

.tag {
  font-size: 0.7rem;
  background: var(--navy-light);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  color: var(--muted);
}

.hint { color: var(--muted); font-size: 0.88em; }

/* ── Buttons ─────────────────────────────────────────────────────── */

.btn-primary {
  background: var(--accent);
  border: none;
  color: #fff;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s;
  width: 100%;
  margin-top: 0.5rem;
}
.btn-primary:hover { filter: brightness(1.15); }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 0.4rem 0.9rem;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: var(--muted); color: var(--text); }

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

#game-screen { width: 100%; max-width: 660px; }

/* ── Game bar ────────────────────────────────────────────────────── */

.game-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.1rem;
}

.game-bar-actions { display: flex; gap: 0.5rem; }

.turn-indicator {
  font-size: 1.05rem;
  font-weight: 700;
  padding: 0.4rem 1.1rem;
  border-radius: 20px;
  border: 2px solid transparent;
  transition: color 0.3s, background 0.3s, border-color 0.3s;
}
.turn-indicator.p1 { color: var(--red);  background: var(--red-bg);  border-color: var(--red-border); }
.turn-indicator.p2 { color: var(--blue); background: var(--blue-bg); border-color: var(--blue-border); }

/* ── Grid ────────────────────────────────────────────────────────── */

.grid-wrap {
  background: var(--navy-mid);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 1rem;
}

.chomp-grid {
  display: grid;
  gap: 5px;
}

.chomp-cell {
  width: 100%;
  aspect-ratio: 1;
  background: var(--navy-light);
  border: 1.5px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.18s, border-color 0.18s, transform 0.12s;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chomp-cell:hover:not(.removed) {
  border-color: var(--accent);
}

.chomp-cell.will-chomp:not(.removed) {
  transform: scale(1.04);
}

.chomp-cell.will-chomp.p1:not(.removed) {
  background: var(--red-bg);
  border-color: var(--red-border);
}

.chomp-cell.will-chomp.p2:not(.removed) {
  background: var(--blue-bg);
  border-color: var(--blue-border);
}

.chomp-cell.removed {
  background: #1a2535;
  border-color: #1f2d40;
  cursor: default;
  transform: none;
}

.chomp-cell.poison img {
  width: 90%;
  height: 90%;
  object-fit: contain;
  pointer-events: none;
  display: block;
}

.chomp-cell.poison.removed img {
  opacity: 0.25;
}

/* ── Prompt / thinking indicator ────────────────────────────────────
   These occupy the same slot (stacked via grid) so that whichever one
   is showing, the slot is always the same height — the badge below
   never jumps, regardless of how the two texts compare in size. */

.status-slot {
  display: grid;
  margin-bottom: 1rem;
}

.status-slot > * {
  grid-area: 1 / 1;
}

#prompt-section[hidden],
#thinking-indicator[hidden] {
  display: block;
  visibility: hidden;
}

.moves-section { text-align: center; }

.moves-label {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 0.7rem;
}

.thinking-indicator {
  text-align: center;
  color: var(--muted);
  font-style: italic;
  font-size: 0.92rem;
  margin-bottom: 0.7rem;
  animation: pulse 1.3s ease-in-out infinite;
}

@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }

/* ── Rules panel ─────────────────────────────────────────────────── */

.rules-panel {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 27, 45, 0.8);
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: overlayFadeIn 0.2s ease;
}
.rules-panel.active { display: flex; }

.rules-box {
  background: var(--navy-mid);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  max-width: 420px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  animation: boxSlideUp 0.3s ease;
}

.rules-panel-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  color: var(--text);
}

.rules-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
}

.rules-list li {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
  padding-left: 1.2rem;
  position: relative;
}

.rules-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ── Game-over panel ─────────────────────────────────────────────── */

.game-over-panel {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 27, 45, 0.8);
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: overlayFadeIn 0.2s ease;
}
.game-over-panel.active { display: flex; }

.game-over-box {
  background: var(--navy-mid);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  max-width: 360px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  animation: boxSlideUp 0.3s ease;
}

@keyframes overlayFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes boxSlideUp {
  from { opacity: 0; transform: translateY(16px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}

.winner-text {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.3rem;
}
.winner-text.p1 { color: var(--red); }
.winner-text.p2 { color: var(--blue); }

.game-over-actions {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
}
.game-over-actions .btn-primary { width: auto; margin-top: 0; }

/* ── Mobile ──────────────────────────────────────────────────────── */

@media (max-width: 480px) {
  main { padding: 1rem 0.75rem; }
  .card { padding: 1.2rem; }
  .grid-wrap { padding: 0.8rem; }
}