/* ==================== VARIABLES ==================== */
:root {
  --bg: #eef1f8;
  --bg-secondary: #ffffff;
  --card-bg: #ffffff;
  --text: #1b1e2b;
  --text-muted: #5b6072;
  --border: #d7dbe8;
  --accent: #6c5ce7;
  --accent-2: #00b894;
  --accent-hover: #5849c4;
  --danger: #e74c3c;
  --warning: #f39c12;
  --shadow: 0 4px 16px rgba(30, 30, 60, 0.08);
  --cell-bg: #dfe4f2;
  --cell-bg-hover: #cfd6ec;
  --cell-revealed: #f6f7fb;
  --cell-flag-bg: #ffe6a7;
  --board-bg: #c7cde3;
  --radius: 12px;
}

[data-theme="dark"] {
  --bg: #14161f;
  --bg-secondary: #1c1f2e;
  --card-bg: #1c1f2e;
  --text: #eef0f8;
  --text-muted: #a2a7c0;
  --border: #33374a;
  --accent: #8b7cf6;
  --accent-2: #2dd4a7;
  --accent-hover: #a294fb;
  --danger: #ff6b6b;
  --warning: #ffb648;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
  --cell-bg: #2a2e42;
  --cell-bg-hover: #363b56;
  --cell-revealed: #22253590;
  --cell-flag-bg: #4a3f22;
  --board-bg: #10121b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  transition: background 0.25s ease, color 0.25s ease;
}

/* ==================== HEADER ==================== */
.app-header {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 20px 16px 8px;
}

.app-header h1 {
  margin: 0;
  font-size: 1.8rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 800;
}

.theme-toggle {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, background 0.2s ease;
}
.theme-toggle:hover { transform: translateY(-50%) scale(1.08); }

/* ==================== TABS ==================== */
.tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 16px 0;
}

.tab-btn {
  background: var(--card-bg);
  color: var(--text-muted);
  border: 2px solid var(--border);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.tab-btn:hover { border-color: var(--accent); color: var(--text); }
.tab-btn.active {
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow);
}

/* ==================== MAIN / PANELS ==================== */
#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}

.game-panel { display: none; }
.game-panel.active { display: block; animation: fadeIn 0.3s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.game-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.instructions {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
}
.instructions summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--accent);
}
.instructions p {
  margin: 10px 0 2px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==================== CONTROLS ==================== */
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.control-group input[type="number"] {
  width: 60px;
  padding: 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

select, .btn {
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}
select:hover, .btn:hover { border-color: var(--accent); }
.btn.primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  color: #fff;
  border: none;
}
.btn.primary:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn.active-toggle {
  background: var(--accent-2);
  color: #06281f;
  border-color: transparent;
}

/* ==================== STATS ==================== */
.stats-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.stat-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 16px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
}

.game-message {
  min-height: 1.4em;
  font-weight: 700;
  font-size: 1.05rem;
}
.game-message.win { color: var(--accent-2); }
.game-message.lose { color: var(--danger); }

/* ==================== BOARD WRAPPER ==================== */
.board-wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
  overflow: auto;
  padding: 4px;
}

/* ==================== MINESWEEPER ==================== */
.ms-board {
  display: grid;
  gap: 3px;
  background: var(--board-bg);
  padding: 6px;
  border-radius: 10px;
  touch-action: manipulation;
  user-select: none;
}

.ms-cell {
  aspect-ratio: 1 / 1;
  width: 100%;
  min-width: 18px;
  background: var(--cell-bg);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  cursor: pointer;
  font-size: var(--ms-cell-font, 14px);
  transition: background 0.12s ease, transform 0.08s ease;
}
.ms-cell:hover { background: var(--cell-bg-hover); }
.ms-cell.revealed {
  background: var(--cell-revealed);
  cursor: default;
}
.ms-cell.flagged { background: var(--cell-flag-bg); }
.ms-cell.mine-hit { background: var(--danger); }
.ms-cell.mine-revealed { background: var(--danger); opacity: 0.7; }
.ms-cell.mine-safe { background: var(--accent-2); opacity: 0.85; }
.ms-cell.pop { animation: pop 0.15s ease; }
@keyframes pop { 0% { transform: scale(0.7); } 100% { transform: scale(1); } }

.ms-cell[data-n="1"] { color: #3b82f6; }
.ms-cell[data-n="2"] { color: #16a34a; }
.ms-cell[data-n="3"] { color: #ef4444; }
.ms-cell[data-n="4"] { color: #7c3aed; }
.ms-cell[data-n="5"] { color: #b45309; }
.ms-cell[data-n="6"] { color: #0891b2; }
.ms-cell[data-n="7"] { color: #111827; }
.ms-cell[data-n="8"] { color: #6b7280; }

.custom-fields { flex-wrap: wrap; }
.custom-fields label { display: flex; align-items: center; gap: 4px; }

/* ==================== SUDOKU ==================== */
.sd-board {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  width: min(90vw, 480px);
  height: min(90vw, 480px);
  background: var(--board-bg);
  border: 3px solid var(--text);
  border-radius: 8px;
  overflow: hidden;
  user-select: none;
}

.sd-cell {
  background: var(--cell-revealed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(14px, 3.2vw, 22px);
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--border);
  color: var(--accent);
  position: relative;
  transition: background 0.15s ease;
}
.sd-cell.given { color: var(--text); background: var(--cell-bg); cursor: default; }
.sd-cell:hover { background: var(--cell-bg-hover); }
.sd-cell.selected { background: var(--accent); color: #fff !important; }
.sd-cell.given.selected { background: var(--accent-hover); color: #fff !important; }
.sd-cell.peer { background: rgba(108, 92, 231, 0.18); }
.sd-cell.error { color: var(--danger) !important; }

.sd-cell:nth-child(3n) { border-right: 3px solid var(--text); }
.sd-cell:nth-child(9n) { border-right: 1px solid var(--border); }
.sd-cell:nth-child(9n+1) { border-left: 3px solid var(--text); }
.sd-row-thick { border-bottom: 3px solid var(--text); }

.sd-notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  font-size: clamp(7px, 1.6vw, 11px);
  font-weight: 600;
  color: var(--text-muted);
  position: absolute;
  top: 0; left: 0;
}
.sd-notes span { display: flex; align-items: center; justify-content: center; }

.sd-numpad {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.sd-num-btn {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-weight: 800;
  font-size: 1.1rem;
  cursor: pointer;
}
.sd-num-btn:hover { border-color: var(--accent); background: var(--cell-bg-hover); }

/* ==================== SNAKE ==================== */
#sn-canvas {
  background: var(--board-bg);
  border-radius: 10px;
  max-width: 100%;
  touch-action: none;
}

/* ==================== FOOTER ==================== */
.app-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 24px 16px 32px;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 600px) {
  .app-header h1 { font-size: 1.4rem; }
  .tab-btn { padding: 8px 14px; font-size: 0.9rem; }
  .btn, select { padding: 8px 12px; font-size: 0.85rem; }
  .stat-box { padding: 6px 10px; font-size: 0.85rem; }
}