/* =========================================================
   Minesweeper — Design Tokens & Themes
   ========================================================= */

:root {
  --radius-card: 16px;
  --radius-tile: 6px;
  --tile-size: 32px;
  --font-family: 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --transition-fast: 0.12s ease;
  --transition-med: 0.25s ease;
}

/* ---------- Dark (default) ---------- */
[data-theme='dark'] {
  --bg: #0f172a;
  --bg-gradient: radial-gradient(circle at 20% -10%, #1e293b 0%, #0f172a 45%, #060a14 100%);
  --surface: rgba(30, 41, 59, 0.6);
  --surface-solid: #1a2436;
  --border: rgba(148, 163, 184, 0.16);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --tile-bg: #334155;
  --tile-bg-hover: #3f4d63;
  --tile-revealed: #1c2635;
  --num-1: #3b82f6;
  --num-2: #22c55e;
  --num-3: #ef4444;
  --num-4: #a855f7;
  --num-5: #f97316;
  --num-6: #22d3ee;
  --num-7: #f8fafc;
  --num-8: #94a3b8;
}

/* ---------- Light ---------- */
[data-theme='light'] {
  --bg: #eef2f7;
  --bg-gradient: radial-gradient(circle at 20% -10%, #ffffff 0%, #e2e8f0 45%, #cbd5e1 100%);
  --surface: rgba(255, 255, 255, 0.65);
  --surface-solid: #ffffff;
  --border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --text-muted: #475569;
  --accent: #0284c7;
  --accent-2: #6366f1;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #d97706;
  --tile-bg: #cbd5e1;
  --tile-bg-hover: #b6c3d6;
  --tile-revealed: #f1f5f9;
  --num-1: #2563eb;
  --num-2: #15803d;
  --num-3: #dc2626;
  --num-4: #7e22ce;
  --num-5: #ea580c;
  --num-6: #0891b2;
  --num-7: #0f172a;
  --num-8: #64748b;
}

/* ---------- Neon ---------- */
[data-theme='neon'] {
  --bg: #05010d;
  --bg-gradient: radial-gradient(circle at 30% -10%, #1a0b2e 0%, #0a0316 45%, #05010d 100%);
  --surface: rgba(30, 12, 55, 0.55);
  --surface-solid: #180a2e;
  --border: rgba(217, 70, 239, 0.25);
  --text: #f3e8ff;
  --text-muted: #c4a6e6;
  --accent: #f0f;
  --accent-2: #00f6ff;
  --success: #39ff14;
  --danger: #ff2079;
  --warning: #ffea00;
  --tile-bg: #23103f;
  --tile-bg-hover: #34174f;
  --tile-revealed: #150a29;
  --num-1: #00f6ff;
  --num-2: #39ff14;
  --num-3: #ff2079;
  --num-4: #d946ef;
  --num-5: #ff9e00;
  --num-6: #22d3ee;
  --num-7: #ffffff;
  --num-8: #c4a6e6;
}

/* ---------- Cyberpunk ---------- */
[data-theme='cyberpunk'] {
  --bg: #08070c;
  --bg-gradient: linear-gradient(160deg, #0d0b14 0%, #170a1f 50%, #0a0e1c 100%);
  --surface: rgba(20, 16, 30, 0.6);
  --surface-solid: #14101e;
  --border: rgba(250, 204, 21, 0.2);
  --text: #fdf4e3;
  --text-muted: #b8a9c9;
  --accent: #facc15;
  --accent-2: #06b6d4;
  --success: #a3e635;
  --danger: #fb2c67;
  --warning: #facc15;
  --tile-bg: #1e1830;
  --tile-bg-hover: #2b2144;
  --tile-revealed: #120f1c;
  --num-1: #06b6d4;
  --num-2: #a3e635;
  --num-3: #fb2c67;
  --num-4: #c026d3;
  --num-5: #fb923c;
  --num-6: #22d3ee;
  --num-7: #fdf4e3;
  --num-8: #9d91b3;
}

/* =========================================================
   Reset & Base
   ========================================================= */

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

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--bg-gradient);
  color: var(--text);
  min-height: 100vh;
  overscroll-behavior: none;
  transition: background var(--transition-med), color var(--transition-med);
}

button, input {
  font-family: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* =========================================================
   Layout
   ========================================================= */

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ---------- Header ---------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 14px 22px;
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
}

.logo {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.header-center {
  display: flex;
  align-items: center;
  gap: 14px;
}

.counter {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  font-variant-numeric: tabular-nums;
}

.counter-icon {
  font-size: 1rem;
}

.counter-value {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  min-width: 3ch;
  text-align: center;
}

.status-btn {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.status-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.status-btn:active {
  transform: translateY(0) scale(0.94);
}

.controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.icon-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  background: var(--tile-bg-hover);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.25);
}

.icon-btn:active:not(:disabled) {
  transform: translateY(0) scale(0.94);
}

.icon-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.icon-btn[aria-pressed='true'] {
  border-color: var(--accent);
  color: var(--accent);
}

/* ---------- Difficulty Selector ---------- */

.difficulty-selector {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.difficulty-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 16px 10px;
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.difficulty-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
}

.difficulty-card.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent) inset, 0 8px 20px rgba(0, 0, 0, 0.25);
}

.difficulty-icon {
  font-size: 1.6rem;
}

.difficulty-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.difficulty-info {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ---------- Custom Panel ---------- */

.custom-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 14px;
  padding: 16px 20px;
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.custom-panel label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.custom-panel input {
  width: 90px;
  padding: 8px 10px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text);
}

/* ---------- Buttons (shared) ---------- */

.btn {
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

.btn:active {
  transform: translateY(0) scale(0.97);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #06111f;
  border-color: transparent;
}

.btn.danger {
  color: var(--danger);
  border-color: var(--danger);
}

/* =========================================================
   Board
   ========================================================= */

.board-wrapper {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  overflow: auto;
  overscroll-behavior: contain;
  padding: 20px;
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  min-height: 200px;
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--cols, 16), var(--tile-size));
  grid-template-rows: repeat(var(--rows, 16), var(--tile-size));
  gap: 3px;
  transition: filter var(--transition-med);
}

.board.board-hidden {
  filter: blur(10px);
  pointer-events: none;
}

.board.shake {
  animation: boardShake 0.5s ease;
}

.board-row {
  display: contents;
}

.cell {
  width: var(--tile-size);
  height: var(--tile-size);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--tile-bg);
  border-radius: var(--radius-tile);
  font-weight: 800;
  font-size: calc(var(--tile-size) * 0.48);
  user-select: none;
  cursor: pointer;
  touch-action: none;
  box-shadow:
    inset 0 -2px 0 rgba(0, 0, 0, 0.25),
    inset 0 2px 0 rgba(255, 255, 255, 0.08);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.cell:hover:not(.revealed) {
  transform: translateY(-2px);
  background: var(--tile-bg-hover);
  box-shadow:
    0 4px 10px rgba(0, 0, 0, 0.3),
    inset 0 -2px 0 rgba(0, 0, 0, 0.25);
}

.cell:active:not(.revealed) {
  transform: translateY(1px) scale(0.94);
}

.cell.revealed {
  cursor: default;
  background: var(--tile-revealed);
  box-shadow: inset 0 0 0 1px var(--border);
  animation: tileReveal 0.18s ease-out;
}

.cell.flagged {
  background: var(--tile-bg);
}

.cell.mine.revealed {
  background: var(--danger);
}

.cell.mine-exploded {
  animation: minePulse 1s ease-out infinite;
}

.cell.hint-flash {
  animation: hintFlash 1s ease-in-out;
}

.cell.num-1 { color: var(--num-1); }
.cell.num-2 { color: var(--num-2); }
.cell.num-3 { color: var(--num-3); }
.cell.num-4 { color: var(--num-4); }
.cell.num-5 { color: var(--num-5); }
.cell.num-6 { color: var(--num-6); }
.cell.num-7 { color: var(--num-7); }
.cell.num-8 { color: var(--num-8); }

/* =========================================================
   Animations
   ========================================================= */

@keyframes tileReveal {
  from { transform: scale(0.4); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes boardShake {
  10%, 90% { transform: translateX(-3px); }
  20%, 80% { transform: translateX(5px); }
  30%, 50%, 70% { transform: translateX(-9px); }
  40%, 60% { transform: translateX(9px); }
}

@keyframes minePulse {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.65); }
  70% { box-shadow: 0 0 0 16px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

@keyframes hintFlash {
  0%, 100% { box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.75); }
  50% { box-shadow: 0 0 0 12px rgba(56, 189, 248, 0); }
}

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

@keyframes popIn {
  from { opacity: 0; transform: scale(0.88) translateY(12px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* =========================================================
   Modals
   ========================================================= */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  animation: fadeIn 0.2s ease-out;
  backdrop-filter: blur(4px);
}

.modal {
  position: relative;
  width: 100%;
  max-width: 460px;
  max-height: 85vh;
  overflow-y: auto;
  background: var(--surface-solid);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow);
  animation: popIn 0.25s ease-out;
}

.modal h2 {
  margin-top: 0;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--tile-bg-hover);
}

.modal-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.result-modal #resultTitle {
  font-size: 1.6rem;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 18px;
}

.result-stats div {
  display: flex;
  flex-direction: column;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}

.result-stats span {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-stats strong {
  font-size: 1.1rem;
}

/* ---------- Stats Grid ---------- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 18px 0;
}

.stats-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
}

.stats-card h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  color: var(--accent);
}

.stats-card dl {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stats-card dl div {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
}

.stats-card dt {
  color: var(--text-muted);
}

.stats-card dd {
  margin: 0;
  font-weight: 700;
}

/* =========================================================
   Confetti
   ========================================================= */

.confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1100;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.confetti-canvas.active {
  opacity: 1;
}

/* =========================================================
   Responsive
   ========================================================= */

@media (max-width: 1024px) {
  .difficulty-selector {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .app-header {
    justify-content: center;
  }

  .header-left {
    order: -1;
    width: 100%;
    text-align: center;
  }

  .header-center {
    order: 0;
  }

  .controls {
    order: 1;
    justify-content: center;
    width: 100%;
  }

  :root {
    --tile-size: 26px;
  }
}

@media (max-width: 480px) {
  .app {
    padding: 12px 10px 30px;
  }

  .difficulty-selector {
    grid-template-columns: repeat(2, 1fr);
  }

  .difficulty-info {
    font-size: 0.68rem;
  }

  .icon-btn, .status-btn {
    width: 36px;
    height: 36px;
    font-size: 0.95rem;
  }

  .custom-panel {
    flex-direction: column;
    align-items: stretch;
  }

  .custom-panel input {
    width: 100%;
  }
}