/* ============================================================
   Ana's Chess — Premium Stylesheet
   ============================================================ */

/* --- CSS Variables (default: Pink Princess theme) --- */
:root {
  --bg-primary: #1a0a1e;
  --bg-secondary: rgba(80, 20, 60, 0.4);
  --bg-panel: rgba(120, 40, 80, 0.15);
  --accent: #ff69b4;
  --accent-glow: rgba(255, 105, 180, 0.3);
  --accent-secondary: #ff9fd5;
  --text-primary: #fff0f6;
  --text-secondary: #d4a0b9;
  --board-light: #ffd6e7;
  --board-dark: #d4669e;
  --board-highlight: rgba(255, 105, 180, 0.5);
  --board-selected: rgba(255, 215, 0, 0.5);
  --board-move-dot: rgba(255, 105, 180, 0.6);
  --board-check: rgba(255, 50, 50, 0.6);
  --board-last-move: rgba(255, 200, 50, 0.35);
  --gradient-start: #2d0a24;
  --gradient-end: #0d0610;
  --border-color: rgba(255, 105, 180, 0.2);

  --board-size: min(70vh, 560px);
  --square-size: calc(var(--board-size) / 8);
  --font: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--transition);
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 3px;
  opacity: 0.5;
}

/* ==========================================
   WELCOME SCREEN
   ========================================== */

.welcome-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.welcome-screen.fade-out {
  opacity: 0;
  transform: scale(1.05);
  pointer-events: none;
}

.welcome-content {
  text-align: center;
  max-width: 600px;
  padding: 3rem 2rem;
  position: relative;
}

.welcome-crown {
  font-size: 4rem;
  animation: crown-bounce 2s ease-in-out infinite;
  margin-bottom: 0.5rem;
}

@keyframes crown-bounce {
  0%, 100% { transform: translateY(0) rotate(-5deg); }
  50% { transform: translateY(-15px) rotate(5deg); }
}

.welcome-title {
  margin-bottom: 0.75rem;
}

.title-line1 {
  display: block;
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.title-name {
  display: block;
  font-size: 3.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.welcome-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  font-weight: 300;
}

/* Welcome Settings */
.welcome-settings {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.setting-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.color-selector {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.color-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.5rem;
  border: 2px solid var(--border-color);
  background: var(--bg-panel);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
}

.color-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.color-btn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 0 20px var(--accent-glow);
}

.color-piece {
  font-size: 1.4rem;
}

.difficulty-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.diff-btn {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border-color);
  background: var(--bg-panel);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
}

.diff-btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.diff-btn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 0 15px var(--accent-glow);
}

.difficulty-selector.compact {
  flex-direction: column;
}

.difficulty-selector.compact .diff-btn {
  font-size: 1.1rem;
  padding: 0.4rem 0.6rem;
}

/* Start Button */
.start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  font-family: var(--font);
  font-size: 1.2rem;
  font-weight: 700;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 25px var(--accent-glow);
}

.start-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 8px 35px var(--accent-glow);
}

.start-btn:active {
  transform: translateY(0) scale(0.98);
}

.start-arrow {
  transition: transform var(--transition);
}

.start-btn:hover .start-arrow {
  transform: translateX(5px);
}

/* Floating Pieces */
.floating-pieces {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.float-piece {
  position: absolute;
  top: -2rem;
  left: var(--x);
  font-size: 2rem;
  opacity: 0.15;
  animation: float-down 8s ease-in-out infinite;
  animation-delay: var(--delay);
}

@keyframes float-down {
  0% { transform: translateY(-50px) rotate(0deg); opacity: 0; }
  10% { opacity: 0.15; }
  90% { opacity: 0.15; }
  100% { transform: translateY(calc(100vh + 50px)) rotate(360deg); opacity: 0; }
}

/* ==========================================
   GAME CONTAINER
   ========================================== */

.game-container {
  display: none;
  flex-direction: column;
  min-height: 100vh;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.game-container.visible {
  display: flex;
  opacity: 1;
}

/* --- Top Bar --- */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo {
  font-size: 1.3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.badge {
  padding: 0.25rem 0.75rem;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.badge-small {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.2rem;
  height: 1.2rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  margin-left: 0.25rem;
}

.top-bar-right {
  display: flex;
  gap: 0.5rem;
}

.icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  background: var(--bg-panel);
  border-radius: var(--radius-sm);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
}

.icon-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

/* --- Game Layout --- */
.game-layout {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem;
  flex: 1;
}

/* --- Panels --- */
.panel {
  width: 200px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex-shrink: 0;
}

.panel-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1rem;
  backdrop-filter: blur(20px);
}

.panel-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
}

/* Captured Pieces */
.captured-pieces {
  font-size: 1.3rem;
  line-height: 1.8;
  min-height: 2rem;
  word-spacing: 2px;
  color: var(--text-secondary);
}

/* Move List */
.move-list {
  max-height: 280px;
  overflow-y: auto;
  font-size: 0.85rem;
}

.move-row {
  display: grid;
  grid-template-columns: 2rem 1fr 1fr;
  gap: 0.25rem;
  padding: 0.2rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.move-num {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.75rem;
}

.move-san {
  font-weight: 500;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

/* Theme Picker */
.theme-picker {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border-color);
  background: var(--bg-panel);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}

.theme-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.theme-btn.active {
  border-color: var(--accent);
  background: var(--accent-glow);
  box-shadow: 0 0 10px var(--accent-glow);
}

.theme-emoji {
  font-size: 1rem;
}

.theme-name {
  flex: 1;
}

/* ==========================================
   CHESS BOARD
   ========================================== */

.board-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.status-bar {
  width: var(--board-size);
  padding: 0.6rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  text-align: center;
}

.status-text {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.chess-board {
  display: grid;
  grid-template-columns: repeat(8, var(--square-size));
  grid-template-rows: repeat(8, var(--square-size));
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow:
    0 0 0 3px var(--accent),
    0 0 40px var(--accent-glow),
    0 20px 60px rgba(0, 0, 0, 0.5);
  position: relative;
}

/* --- Squares --- */
.square {
  width: var(--square-size);
  height: var(--square-size);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

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

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

.square:hover {
  filter: brightness(1.1);
}

.square.selected {
  background: var(--board-selected) !important;
}

.square.last-move {
  background: var(--board-last-move) !important;
}

.square.in-check {
  background: var(--board-check) !important;
  animation: check-pulse 1s ease-in-out infinite;
}

.square.hint {
  background: rgba(100, 255, 100, 0.4) !important;
  animation: hint-glow 1s ease-in-out infinite;
}

.square.capture-target {
  background-image: radial-gradient(circle, transparent 55%, var(--board-move-dot) 56%, var(--board-move-dot) 70%, transparent 71%);
}

@keyframes check-pulse {
  0%, 100% { box-shadow: inset 0 0 10px rgba(255, 50, 50, 0.3); }
  50% { box-shadow: inset 0 0 25px rgba(255, 50, 50, 0.6); }
}

@keyframes hint-glow {
  0%, 100% { box-shadow: inset 0 0 10px rgba(100, 255, 100, 0.2); }
  50% { box-shadow: inset 0 0 20px rgba(100, 255, 100, 0.5); }
}

/* --- Move Dots --- */
.move-dot {
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: var(--board-move-dot);
  pointer-events: none;
  animation: dot-appear 0.2s ease;
}

@keyframes dot-appear {
  from { transform: scale(0); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* --- Pieces --- */
.piece {
  width: 85%;
  height: 85%;
  pointer-events: none;
  transition: transform 0.15s ease;
  filter: drop-shadow(1px 2px 3px rgba(0, 0, 0, 0.3));
  z-index: 1;
}

.piece svg {
  width: 100%;
  height: 100%;
}

.square:hover .piece {
  transform: scale(1.08);
}

.square.selected .piece {
  transform: scale(1.12);
  filter: drop-shadow(2px 4px 6px rgba(0, 0, 0, 0.5));
}

/* --- Coordinates --- */
.coord {
  position: absolute;
  font-size: 0.65rem;
  font-weight: 700;
  pointer-events: none;
  opacity: 0.6;
  z-index: 2;
}

.coord-rank {
  top: 3px;
  left: 4px;
}

.coord-file {
  bottom: 2px;
  right: 4px;
}

.light .coord { color: var(--board-dark); }
.dark .coord { color: var(--board-light); }

/* --- Board Controls --- */
.board-controls {
  display: flex;
  gap: 0.5rem;
  width: var(--board-size);
  justify-content: center;
}

.control-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  backdrop-filter: blur(10px);
}

.control-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

.control-btn:active {
  transform: translateY(0);
}

.control-btn.accent {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
  font-weight: 600;
}

.control-btn.accent:hover {
  box-shadow: 0 4px 20px var(--accent-glow);
}

.control-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

/* ==========================================
   PROMOTION DIALOG
   ========================================== */

.promotion-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(5px);
  animation: fade-in 0.2s ease;
}

.promotion-dialog {
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 0 40px var(--accent-glow);
}

.promotion-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.promotion-options {
  display: flex;
  gap: 0.75rem;
}

.promotion-btn {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border-color);
  background: var(--bg-secondary);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.promotion-btn svg {
  width: 44px;
  height: 44px;
}

.promotion-btn:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: scale(1.15);
}

/* ==========================================
   GAME OVER MODAL
   ========================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

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

.modal {
  background: linear-gradient(145deg, var(--bg-primary), var(--gradient-start));
  border: 2px solid var(--accent);
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  max-width: 420px;
  box-shadow: 0 0 60px var(--accent-glow);
  transform: scale(0.8);
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-overlay.visible .modal {
  transform: scale(1);
}

.modal-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-message {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.5;
}

/* ==========================================
   CONFETTI
   ========================================== */

.confetti-piece {
  position: fixed;
  top: -20px;
  z-index: 400;
  opacity: 0;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 1100px) {
  .game-layout {
    flex-wrap: wrap;
    justify-content: center;
  }

  .panel {
    width: 100%;
    max-width: 560px;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .panel-section {
    flex: 1;
    min-width: 150px;
  }

  .panel-left {
    order: 2;
  }

  .panel-right {
    order: 3;
  }

  .board-area {
    order: 1;
    width: 100%;
  }
}

@media (max-width: 620px) {
  :root {
    --board-size: min(90vw, 400px);
  }

  .welcome-content {
    padding: 2rem 1rem;
  }

  .title-name {
    font-size: 2.5rem;
  }

  .top-bar {
    padding: 0.5rem 1rem;
  }

  .logo {
    font-size: 1rem;
  }

  .game-layout {
    padding: 1rem 0.5rem;
    gap: 1rem;
  }

  .panel {
    flex-direction: column;
  }

  .board-controls {
    flex-wrap: wrap;
  }

  .control-btn {
    font-size: 0.78rem;
    padding: 0.4rem 0.75rem;
  }

  .difficulty-selector {
    gap: 0.35rem;
  }

  .diff-btn {
    padding: 0.35rem 0.6rem;
    font-size: 0.75rem;
  }

  .modal {
    padding: 2rem 1.5rem;
    margin: 1rem;
  }

  .modal-title {
    font-size: 1.5rem;
  }
}