/* ========================================
   Queen's Game - Stylesheet
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-hover: #252540;
  --text-primary: #e8e8f0;
  --text-secondary: #8888a0;
  --text-muted: #555570;
  --accent: #c9a84c;
  --accent-glow: rgba(201, 168, 76, 0.3);
  --accent-hover: #ddb94f;
  --danger: #e05555;
  --danger-glow: rgba(224, 85, 85, 0.25);
  --success: #4caf7d;
  --success-glow: rgba(76, 175, 125, 0.25);
  --board-light: #2a2a42;
  --board-dark: #1e1e32;
  --board-highlight: rgba(201, 168, 76, 0.15);
  --board-conflict: rgba(224, 85, 85, 0.2);
  --border: #2a2a40;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 0 1rem;
}

/* --- Header --- */
.header {
  text-align: center;
  padding: 2.5rem 0 1rem;
  width: 100%;
}

.title {
  font-family: 'Times New Roman', 'Georgia', serif;
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
  text-shadow: 0 0 40px var(--accent-glow);
  margin-bottom: 0.35rem;
}

.subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.02em;
}

/* --- Board Size Selector --- */
.selector-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  max-width: 600px;
  width: 100%;
  margin: 1.5rem auto 2rem;
  position: relative;
}

.scroll-btn {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  line-height: 1;
}

.scroll-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent);
}

.selector-track {
  flex: 1;
  overflow: hidden;
  border-radius: var(--radius-md);
  mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
}

.selector-inner {
  display: flex;
  gap: 0.6rem;
  padding: 0.5rem 1rem;
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: grab;
  user-select: none;
}

.selector-inner:active {
  cursor: grabbing;
}

.size-btn {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-family: 'Pretendard', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  position: relative;
}

.size-btn .size-label {
  font-size: 0.55rem;
  font-weight: 400;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.size-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: var(--bg-hover);
  transform: translateY(-2px);
}

.size-btn.active {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.15), rgba(201, 168, 76, 0.05));
  color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.size-btn.active .size-label {
  color: var(--accent);
}

/* --- Game Area --- */
.game-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  width: 100%;
  max-width: 700px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.game-area.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Game Info --- */
.game-info {
  display: flex;
  gap: 2rem;
  justify-content: center;
  padding: 0.8rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.info-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.info-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.info-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
}

.info-separator {
  color: var(--text-muted);
  font-weight: 300;
}

.conflict-count {
  color: var(--danger);
}

/* --- Board --- */
.board-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.board {
  display: grid;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow), 0 0 60px rgba(201, 168, 76, 0.05);
}

.cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition);
  position: relative;
  font-size: 1.5rem;
}

.cell.light {
  background: var(--board-light);
}

.cell.dark {
  background: var(--board-dark);
}

.cell:hover:not(.hint) {
  background: var(--board-highlight);
}

.cell.conflict {
  background: var(--board-conflict) !important;
}

.cell.hint {
  cursor: default;
}

.cell .queen {
  font-size: inherit;
  line-height: 1;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s ease;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.cell .queen.user-queen {
  color: var(--accent);
  animation: placeQueen 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cell .queen.hint-queen {
  color: var(--success);
  text-shadow: 0 0 12px var(--success-glow);
}

.cell .queen.conflict-queen {
  color: var(--danger);
  animation: shake 0.4s ease;
}

@keyframes placeQueen {
  0% { transform: scale(0) rotate(-45deg); opacity: 0; }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-3px); }
  40% { transform: translateX(3px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

/* Cell row/col labels (optional visual) */
.cell::after {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity var(--transition);
}

/* --- Controls --- */
.controls {
  display: flex;
  gap: 0.8rem;
}

.btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-family: 'Pretendard', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

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

.btn-check {
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.2), rgba(201, 168, 76, 0.08));
  border-color: var(--accent);
  color: var(--accent);
}

.btn-check:hover {
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.3), rgba(201, 168, 76, 0.12));
  color: var(--accent-hover);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  max-width: 380px;
  width: 90%;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.modal-overlay.show .modal {
  transform: scale(1) translateY(0);
}

.modal-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  line-height: 1;
}

.modal-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.modal-message {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.btn-modal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.2), rgba(201, 168, 76, 0.08));
  color: var(--accent);
  font-family: 'Pretendard', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-modal:hover {
  background: linear-gradient(135deg, rgba(201, 168, 76, 0.35), rgba(201, 168, 76, 0.15));
  box-shadow: 0 0 20px var(--accent-glow);
}

/* --- Success Animation --- */
.board.success .cell .queen {
  animation: celebrate 0.6s ease forwards;
}

@keyframes celebrate {
  0% { transform: scale(1); }
  50% { transform: scale(1.2) rotate(10deg); }
  100% { transform: scale(1); }
}

.board.success {
  border-color: var(--success);
  box-shadow: var(--shadow), 0 0 40px var(--success-glow);
}

/* --- Footer --- */
.footer {
  margin-top: auto;
  padding: 2rem 0 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.footer a:hover {
  color: var(--accent);
}

/* --- Responsive --- */
@media (max-width: 600px) {
  .header {
    padding: 1.5rem 0 0.8rem;
  }

  .selector-wrapper {
    margin: 1rem auto 1.5rem;
  }

  .size-btn {
    width: 48px;
    height: 48px;
    font-size: 0.95rem;
  }

  .game-info {
    gap: 1.2rem;
    padding: 0.6rem 1rem;
  }

  .controls {
    gap: 0.6rem;
  }

  .btn {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 400px) {
  .size-btn {
    width: 42px;
    height: 42px;
    font-size: 0.85rem;
  }

  .size-btn .size-label {
    display: none;
  }
}

/* --- Drag Scrolling visual feedback --- */
.selector-inner.dragging {
  cursor: grabbing;
}

/* --- Subtle background pattern --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(201, 168, 76, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(100, 100, 180, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}