@import url('https://fonts.googleapis.com/css2?family=Syne:wght@700;800;900&family=JetBrains+Mono:wght@400;600;700&family=Inter:wght@400;500;600;700&display=swap');

/* ─── Design tokens — Deep Space Amber ──────────────────────────────────── */
:root {
  --bg:        #080a0e;
  --surface:   #0d1117;
  --panel:     rgba(13, 17, 23, 0.96);
  --border:    rgba(255, 180, 60, 0.12);
  --border-hi: rgba(0, 229, 204, 0.40);
  --text:      #f2ede4;
  --muted:     #8a8070;
  --dim:       #4a4438;
  --amber:     #ffaa00;
  --amber-dim: rgba(255, 170, 0, 0.12);
  --teal:      #00e5cc;
  --teal-dim:  rgba(0, 229, 204, 0.11);
  --coral:     #ff6b4a;
  --coral-dim: rgba(255, 107, 74, 0.12);
  --lime:      #c8f135;
  --lime-dim:  rgba(200, 241, 53, 0.10);
  --danger:    #ff4d6d;
  --wall:      #e0f0ff;
  --cell-bg:   #05080a;
  --visited:   rgba(0, 229, 204, 0.18);
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --shadow:    0 24px 80px rgba(0, 0, 0, 0.7);

  --font-display: 'Syne', ui-sans-serif, system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;
  --font-body:    'Inter', ui-sans-serif, system-ui, sans-serif;

  /* semantic aliases */
  --cyan:      var(--teal);
  --cyan-dim:  var(--teal-dim);
  --green:     var(--lime);
  --green-dim: var(--lime-dim);
  --orange:    var(--amber);
  --pink:      var(--coral);
  --pink-dim:  var(--coral-dim);
  --purple:    var(--teal);
  --purple-dim:var(--teal-dim);
  --gold:      var(--amber);
  --acid:      var(--lime);
  --acid-dim:  var(--lime-dim);
}

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

html { min-height: 100%; background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  padding: 20px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  background:
    radial-gradient(ellipse at 15% 0%,   rgba(234, 233, 231, 0.622)  0%, transparent 40%),
    radial-gradient(ellipse at 88% 12%,  rgba(233, 242, 241, 0.702)  0%, transparent 38%),
    radial-gradient(ellipse at 50% 95%,  rgb(232, 230, 229) 0%, transparent 40%),
    linear-gradient(170deg, #06080c 0%, #c0ddde 55%, #070a0d 100%);
}

button, select, textarea { font: inherit; }

button {
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  background: rgba(15, 23, 42, 0.8);
  transition: border-color 0.18s, box-shadow 0.18s, transform 0.12s, background 0.18s;
}

button:hover  { border-color: var(--border-hi); }
button:active { transform: translateY(1px) scale(0.98); }

button:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ─── Start screen ───────────────────────────────────────────────────────── */
.start-screen {
  position: fixed;
  z-index: 30;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  padding: 32px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 30%, rgba(255, 170, 0, 0.08)  0%, transparent 50%),
    radial-gradient(ellipse at 70% 70%, rgba(0, 229, 204, 0.06)  0%, transparent 40%),
    #06080c;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.start-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.start-logo {
  font-size: 3.2rem;
  color: var(--amber);
  margin-bottom: 16px;
  opacity: 0.9;
  text-shadow: 0 0 32px rgba(255, 170, 0, 0.45);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.start-screen h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 9vw, 6.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 0.95;
  background: linear-gradient(120deg, #ffe066 10%, #ffaa00 45%, #ff6b4a 85%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.start-copy {
  max-width: 420px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.start-modes {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
}

.start-mode {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.03);
  min-width: 130px;
}

.start-mode .mode-icon { font-size: 1.5rem; }
.start-mode strong { color: var(--text); font-size: 0.85rem; font-family: var(--font-display); }
.start-mode span   { color: var(--muted); font-size: 0.72rem; }

.start-mode-divider {
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.start-btn {
  padding: 14px 36px;
  border: 1px solid rgba(255, 170, 0, 0.5);
  border-radius: var(--radius);
  color: #0a0800;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, #ffe066, #ffaa00 55%, #ff8c42);
  box-shadow: 0 12px 40px rgba(255, 170, 0, 0.25);
}

.start-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 50px rgba(255, 170, 0, 0.35); }

.start-hint {
  margin: 16px 0 0;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ─── App shell ──────────────────────────────────────────────────────────── */
.app-shell {
  width: min(1400px, 100%);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ─── Topbar ─────────────────────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  backdrop-filter: blur(16px);
}

.topbar-brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  background: linear-gradient(120deg, #ffe066 10%, #ffaa00 50%, #ff6b4a 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.topbar-sub {
  margin: 3px 0 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.topbar-right { display: flex; align-items: center; gap: 10px; }

.difficulty-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

select {
  padding: 7px 11px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  background: rgba(15, 23, 42, 0.8);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

select:hover { border-color: var(--border-hi); }

/* ─── 3-column layout ────────────────────────────────────────────────────── */
.game-layout {
  display: grid;
  grid-template-columns: 220px 1fr 260px;
  gap: 14px;
  align-items: start;
}

/* ─── Shared panel ───────────────────────────────────────────────────────── */
.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  backdrop-filter: blur(14px);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.panel-title {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ─── Controls panel ─────────────────────────────────────────────────────── */
.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.play-mode-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 8px 10px 4px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.mode-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 8px var(--amber);
  animation: dot-pulse 2s ease-in-out infinite;
}

@keyframes dot-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

.controls-hint {
  margin: 0 10px 10px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
}

/* D-pad */
.dpad {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 0 10px 10px;
}

.dpad-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.dpad-btn {
  width: 58px;
  height: 58px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(20, 18, 12, 0.92);
  color: var(--amber);
  font-size: 1.5rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}

.dpad-btn:hover {
  background: rgba(40, 30, 8, 0.98);
  border-color: rgba(255, 170, 0, 0.5);
  box-shadow: 0 0 20px rgba(255, 170, 0, 0.18);
}

.dpad-btn:active {
  transform: scale(0.92);
  background: rgba(255, 170, 0, 0.12);
}

.dpad-center {
  width: 58px;
  height: 58px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

/* Stats grid */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 0 10px 10px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
}

.stat-label {
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stat-value {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.status-val { color: var(--teal); font-size: 0.85rem; font-family: var(--font-mono); }

.bottom-controls {
  padding: 0 10px 10px;
  display: flex;
  gap: 8px;
}

.ghost-btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.ghost-btn:hover {
  border-color: rgba(255, 170, 0, 0.35);
  color: var(--amber);
  background: rgba(255, 170, 0, 0.05);
}

.ghost-btn-sm { padding: 5px 10px; font-size: 0.72rem; }

.continue-ai-btn {
  flex: 1;
  padding: 8px 10px;
  border: 1.5px solid rgba(0, 229, 204, 0.35);
  border-radius: var(--radius-sm);
  background: rgba(0, 229, 204, 0.07);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.continue-ai-btn:hover {
  background: rgba(0, 229, 204, 0.14);
  border-color: rgba(0, 229, 204, 0.6);
  box-shadow: 0 0 16px rgba(0, 229, 204, 0.12);
}

.continue-ai-btn:active { transform: scale(0.97); }

/* ─── Maze panel ─────────────────────────────────────────────────────────── */
.maze-panel {
  border: 1px solid rgba(255, 170, 0, 0.25);
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, #1a0f2e 0%, #0a1f14 50%, #1f0e04 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px;
  gap: 4px;
  box-shadow:
    0 8px 40px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,170,0,0.10),
    0 0 0 1px rgba(0,229,204,0.06);
}

.maze-labels {
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 4px;
}

.maze-label-start,
.maze-label-exit {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.maze-label-start { color: var(--amber); }
.maze-label-exit  { color: var(--teal); }

.maze-board {
  width: min(68vh, 660px, 100%);
  aspect-ratio: 1;
  display: grid;
  border: 1.5px solid rgba(255, 170, 0, 0.22);
  border-radius: 12px;
  overflow: hidden;
  background: #04060a;
  box-shadow:
    0 0 0 4px rgba(0, 229, 204, 0.06),
    0 0 0 8px rgba(255, 170, 0, 0.04),
    0 20px 60px rgba(0, 0, 0, 0.7),
    inset 0 0 100px rgba(0, 229, 204, 0.07),
    inset 0 0 50px rgba(255, 170, 0, 0.05);
}

/* Per-size wall thickness and emoji scaling */
.maze-board[data-size="10"] .cell {
  border-width: 2px;
}
.maze-board[data-size="20"] .cell {
  border-width: 1px;
}
.maze-board[data-size="30"] .cell {
  border-width: 1px;
}

.maze-board[data-size="10"] .cell.player::before,
.maze-board[data-size="10"] .cell.goal::before {
  font-size: clamp(10px, 4cqi, 28px);
}
.maze-board[data-size="20"] .cell.player::before,
.maze-board[data-size="20"] .cell.goal::before {
  font-size: clamp(6px, 2.2cqi, 18px);
}
.maze-board[data-size="30"] .cell.player::before,
.maze-board[data-size="30"] .cell.goal::before {
  font-size: clamp(4px, 1.4cqi, 12px);
}

/* Cells */
.cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  background: var(--cell-bg);
  border-top:    var(--cell-border, 2px) solid transparent;
  border-right:  var(--cell-border, 2px) solid transparent;
  border-bottom: var(--cell-border, 2px) solid transparent;
  border-left:   var(--cell-border, 2px) solid transparent;
  transition: background 0.15s;
}

.cell.visited { background: var(--visited); }

.cell.wall-n { border-top-color:    var(--wall); }
.cell.wall-e { border-right-color:  var(--wall); }
.cell.wall-s { border-bottom-color: var(--wall); }
.cell.wall-w { border-left-color:   var(--wall); }

/* Player */
.cell.player::after,
.cell.goal::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  display: block;
}

.cell.player::before {
  content: "👾";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(6px, 1.8cqi, 22px); /* overridden per data-size */
  line-height: 1;
  z-index: 2;
  animation: player-pulse 1.3s ease-in-out infinite;
  filter: drop-shadow(0 0 4px rgba(255,170,0,0.9));
}

.cell.player::after { background: none; box-shadow: none; animation: none; }

.cell.goal::before {
  content: "🔮";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(6px, 1.8cqi, 22px); /* overridden per data-size */
  line-height: 1;
  z-index: 2;
  animation: goal-pulse 1.5s ease-in-out infinite;
  filter: drop-shadow(0 0 5px rgba(0,229,204,0.9));
}

.cell.goal::after { background: none; box-shadow: none; animation: none; }

.cell.player.goal::before { content: "💥"; }

@keyframes player-pulse {
  0%, 100% { transform: scale(0.9); }
  50%       { transform: scale(1); }
}

@keyframes goal-pulse {
  0%, 100% { transform: scale(0.88); opacity: 0.8; }
  50%       { transform: scale(1); opacity: 1; }
}

/* ─── AI panel ───────────────────────────────────────────────────────────── */
.ai-panel {
  display: flex;
  flex-direction: column;
}

.webmcp-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.webmcp-badge.online {
  color: #c8f135;
  background: rgba(200, 241, 53, 0.12);
  border: 1px solid rgba(200, 241, 53, 0.28);
}

.webmcp-badge.offline {
  color: var(--muted);
  background: rgba(148, 163, 184, 0.07);
  border: 1px solid var(--border);
}

.ai-status-block {
  padding: 10px 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.ai-phase {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  color: var(--text);
  letter-spacing: 0.01em;
}

.ai-progress {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--teal);
  min-height: 1.2em;
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* Solve button */
.solve-btn {
  margin: 0 10px 10px;
  padding: 12px 14px;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #ffaa00, #00e5cc);
  color: #06080c;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: 0 6px 24px rgba(255, 170, 0, 0.28);
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}

.solve-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 32px rgba(255, 170, 0, 0.38);
}

.solve-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.solve-btn-success {
  background: linear-gradient(135deg, #00e5cc, #c8f135) !important;
  box-shadow: 0 6px 24px rgba(0, 229, 204, 0.28) !important;
}

.solve-btn-icon { font-size: 1.1rem; }

/* Success block */
.ai-success {
  margin: 0 10px 10px;
  padding: 10px;
  border: 1px solid rgba(0, 229, 204, 0.28);
  border-radius: var(--radius);
  background: rgba(0, 229, 204, 0.07);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ai-success-icon { font-size: 1.8rem; color: var(--teal); }

.ai-success-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 900;
  color: var(--teal);
  letter-spacing: 0.04em;
}

.ai-success-detail {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

.ai-divider {
  height: 1px;
  background: var(--border);
  margin: 0 10px;
}

.ai-log-block {
  margin: 0 10px 8px;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.18);
}

.ai-log-label {
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.ai-log-value {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.5;
  word-break: break-word;
}

.ai-prompt-block {
  margin: 0 10px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Dev log */
.dev-log { margin: 0; }

.dev-log-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  cursor: pointer;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  list-style: none;
  user-select: none;
  transition: color 0.15s;
}

.dev-log-toggle::-webkit-details-marker { display: none; }
.dev-log-toggle:hover { color: var(--muted); }

.dev-log-body {
  padding: 0 10px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dev-log-section { display: flex; flex-direction: column; gap: 4px; }

.dev-log-label {
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.dev-log-value {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.5;
  margin: 0;
  word-break: break-word;
}

.dev-tools-list {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-direction: column; gap: 2px;
}

.dev-tools-list li {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 3px 6px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.03);
}

.dev-tools-list li::before { content: "\25B8  "; color: var(--teal); }

.dev-prompt {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.20);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.45;
  outline: none;
}

.dev-prompt::placeholder { color: var(--dim); }
.dev-prompt:focus { border-color: rgba(0, 229, 204, 0.45); }

.dev-note {
  margin: 0;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  line-height: 1.4;
}

/* ─── Footer ─────────────────────────────────────────────────────────────── */
.app-footer {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 4px 0 8px;
}

/* ─── Responsive: tablet ─────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .game-layout {
    grid-template-columns: 200px 1fr 240px;
    gap: 12px;
  }
}

@media (max-width: 900px) {
  body { padding: 12px; }

  .game-layout {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
  }

  .maze-panel {
    grid-column: 1 / -1;
    order: 1;
  }

  .controls-panel {
    order: 2;
  }

  .ai-panel {
    order: 3;
  }

  .maze-board { width: min(75vw, 600px); }
}

/* ─── Responsive: mobile ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
  body { padding: 8px; }

  .topbar { flex-direction: column; align-items: flex-start; gap: 10px; }

  .game-layout {
    grid-template-columns: 1fr;
  }

  .maze-panel  { order: 1; }
  .controls-panel { order: 2; }
  .ai-panel    { order: 3; }

  .maze-board { width: 100%; }

  .stats-grid { grid-template-columns: 1fr 1fr; }

  .start-modes { flex-direction: column; gap: 10px; }
  .start-mode-divider { transform: rotate(90deg); }
}

/* ─── Reduced motion ─────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}