/* ============================================================
   ARCANE CIRCUIT — Cyberpunk Alchemist Chess
   style.css
   ============================================================ */

:root {
  --neon-cyan: #00f5ff;
  --neon-gold: #ffd700;
  --neon-purple: #bf5fff;
  --neon-red: #ff2a6d;
  --dark-bg: #050810;
  --board-dark: #0d1a2e;
  --board-light: #1a2f4e;
  --panel-bg: rgba(5, 8, 16, 0.95);
  --glow-cyan: 0 0 10px #00f5ff, 0 0 20px #00f5ff44, 0 0 40px #00f5ff22;
  --glow-gold: 0 0 10px #ffd700, 0 0 20px #ffd70044, 0 0 40px #ffd70022;
  --glow-purple: 0 0 10px #bf5fff, 0 0 20px #bf5fff44;
  --glow-red: 0 0 10px #ff2a6d, 0 0 20px #ff2a6d44;
}

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

body {
  background: var(--dark-bg);
  color: #c0d8ff;
  font-family: 'Rajdhani', sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

/* Animated background grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 245, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(191, 95, 255, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(0, 245, 255, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 90%, rgba(255, 215, 0, 0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ---- Header ---- */
header {
  position: relative;
  z-index: 10;
  text-align: center;
  padding: 20px 0 10px;
  width: 100%;
}

.game-title {
  font-family: 'Cinzel Decorative', serif;
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 900;
  letter-spacing: 0.3em;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-gold), var(--neon-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px rgba(0, 245, 255, 0.5));
}

.game-subtitle {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.6rem;
  letter-spacing: 0.5em;
  color: var(--neon-purple);
  opacity: 0.8;
  margin-top: 4px;
  text-shadow: var(--glow-purple);
}

.rune-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
  margin: 8px 0;
  opacity: 0.6;
}
.rune-divider::before,
.rune-divider::after {
  content: '';
  height: 1px;
  width: 80px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan));
}
.rune-divider::after { background: linear-gradient(90deg, var(--neon-cyan), transparent); }
.rune-symbol { color: var(--neon-gold); font-size: 0.9rem; }

/* ---- Layout ---- */
.game-container {
  position: relative;
  z-index: 10;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 10px 20px 20px;
  width: 100%;
  max-width: 1100px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Side Panels ---- */
.side-panel {
  width: 200px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-card {
  background: var(--panel-bg);
  border: 1px solid rgba(0, 245, 255, 0.15);
  border-radius: 4px;
  padding: 14px;
  position: relative;
  overflow: hidden;
}

.panel-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
}

.panel-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.55rem;
  letter-spacing: 0.3em;
  color: var(--neon-cyan);
  text-transform: uppercase;
  margin-bottom: 10px;
  opacity: 0.8;
}

/* ---- Mode Buttons ---- */
.mode-btn {
  width: 100%;
  padding: 8px 10px;
  background: transparent;
  border: 1px solid rgba(191, 95, 255, 0.3);
  color: #8899cc;
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: all 0.3s;
  border-radius: 2px;
  margin-bottom: 6px;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mode-btn:hover,
.mode-btn.active {
  border-color: var(--neon-purple);
  color: var(--neon-purple);
  background: rgba(191, 95, 255, 0.08);
  box-shadow: inset 0 0 10px rgba(191, 95, 255, 0.1), 0 0 10px rgba(191, 95, 255, 0.2);
}

.mode-btn .mode-icon { font-size: 1rem; }

/* ---- Player Info ---- */
.player-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.player-name {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
}
.player-name.white-player { color: var(--neon-gold); text-shadow: var(--glow-gold); }
.player-name.black-player { color: var(--neon-purple); text-shadow: var(--glow-purple); }

.player-faction {
  font-size: 0.75rem;
  color: #556688;
  font-style: italic;
}

.captured-pieces {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  min-height: 24px;
  font-size: 0.85rem;
  opacity: 0.7;
}

/* ---- Turn Indicator ---- */
.turn-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
}
.turn-indicator.active-gold   { background: var(--neon-gold);   box-shadow: var(--glow-gold);   animation: pulse 1.5s infinite; }
.turn-indicator.active-purple { background: var(--neon-purple); box-shadow: var(--glow-purple); animation: pulse 1.5s infinite; }
.turn-indicator.inactive      { background: #223; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.6; transform: scale(0.8); }
}

/* ---- Status ---- */
.status-text {
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  padding: 8px;
  border-radius: 2px;
  letter-spacing: 0.05em;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.status-normal   { color: var(--neon-cyan); }
.status-check    { color: var(--neon-red);    text-shadow: var(--glow-red);  animation: flicker 0.5s infinite; }
.status-win      { color: var(--neon-gold);   text-shadow: var(--glow-gold); }
.status-thinking { color: var(--neon-purple); }

@keyframes flicker {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.7; }
}

/* ---- Move History ---- */
.move-list {
  max-height: 200px;
  overflow-y: auto;
  font-size: 0.78rem;
  line-height: 1.8;
  color: #667799;
  scrollbar-width: thin;
  scrollbar-color: var(--neon-cyan) transparent;
}
.move-list::-webkit-scrollbar       { width: 3px; }
.move-list::-webkit-scrollbar-thumb { background: var(--neon-cyan); }

.move-entry { display: flex; gap: 6px; }
.move-num   { color: #334455; width: 20px; }
.move-white { color: #aabbcc; }
.move-black { color: #8877aa; }

/* ---- Action Buttons ---- */
.action-btn {
  width: 100%;
  padding: 8px;
  background: transparent;
  border: 1px solid rgba(0, 245, 255, 0.2);
  color: #667799;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  cursor: pointer;
  transition: all 0.3s;
  border-radius: 2px;
  margin-bottom: 6px;
}
.action-btn:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 10px rgba(0, 245, 255, 0.2);
}

/* ---- Difficulty ---- */
.diff-row { display: flex; gap: 4px; }

.diff-btn {
  padding: 5px 8px;
  background: transparent;
  border: 1px solid rgba(0, 245, 255, 0.15);
  color: #556688;
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 2px;
  flex: 1;
}
.diff-btn.active,
.diff-btn:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  background: rgba(0, 245, 255, 0.07);
}

/* ---- Board Wrapper ---- */
.board-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.board-outer {
  position: relative;
  padding: 16px;
  background: linear-gradient(135deg, #0a0f1e, #0d1520, #080d18);
  border: 1px solid rgba(0, 245, 255, 0.2);
  border-radius: 4px;
  box-shadow:
    0 0 30px rgba(0, 245, 255, 0.1),
    0 0 60px rgba(191, 95, 255, 0.08),
    inset 0 0 30px rgba(0, 0, 0, 0.5);
}

/* Scan line overlay */
.board-outer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.05) 2px,
    rgba(0, 0, 0, 0.05) 4px
  );
  pointer-events: none;
  z-index: 10;
  border-radius: 4px;
}

/* Corner runes */
.corner-rune {
  position: absolute;
  font-size: 0.6rem;
  opacity: 0.4;
  font-family: 'Orbitron', sans-serif;
}
.corner-rune.tl { top: 5px;    left: 5px;  color: var(--neon-gold);   }
.corner-rune.tr { top: 5px;    right: 5px; color: var(--neon-cyan);   }
.corner-rune.bl { bottom: 5px; left: 5px;  color: var(--neon-purple); }
.corner-rune.br { bottom: 5px; right: 5px; color: var(--neon-red);    }

/* ---- Board Labels ---- */
.board-labels-row {
  display: flex;
  padding: 0 0 4px 20px;
}

.board-label {
  width: 60px;
  text-align: center;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.5rem;
  color: rgba(0, 245, 255, 0.3);
  letter-spacing: 0.1em;
}

.board-with-ranks {
  display: flex;
  align-items: center;
  gap: 4px;
}

.rank-labels { display: flex; flex-direction: column; }

.rank-label {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.5rem;
  color: rgba(0, 245, 255, 0.3);
  letter-spacing: 0.1em;
  width: 16px;
}

/* ---- Chess Board Grid ---- */
#chess-board {
  display: grid;
  grid-template-columns: repeat(8, 60px);
  grid-template-rows: repeat(8, 60px);
  border: 1px solid rgba(0, 245, 255, 0.25);
  box-shadow:
    inset 0 0 20px rgba(0, 0, 0, 0.8),
    0 0 20px rgba(0, 245, 255, 0.05);
}

/* ---- Squares ---- */
.square {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all 0.15s;
  user-select: none;
}

.square.light { background: linear-gradient(135deg, #1a2f4e, #1e3558); }
.square.dark  { background: linear-gradient(135deg, #0a0f1e, #0d1525); }

/* Circuit pattern on dark squares */
.square.dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 245, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 245, 255, 0.04) 1px, transparent 1px);
  background-size: 10px 10px;
  pointer-events: none;
}

.square:hover { filter: brightness(1.3); }

/* Selected square */
.square.selected {
  background: linear-gradient(135deg, #1a3a1a, #1e4a1e) !important;
  box-shadow: inset 0 0 15px rgba(0, 255, 100, 0.3), 0 0 10px rgba(0, 255, 100, 0.3);
}
.square.selected::after {
  content: '';
  position: absolute;
  inset: 2px;
  border: 1px solid rgba(0, 255, 100, 0.6);
  border-radius: 1px;
  pointer-events: none;
}

/* Valid move dot */
.square.valid-move::after {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(0, 245, 255, 0.25);
  border: 2px solid rgba(0, 245, 255, 0.5);
  box-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
  pointer-events: none;
  z-index: 2;
}

/* Valid capture ring */
.square.valid-capture::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  border: 3px solid rgba(255, 42, 109, 0.6);
  box-shadow: 0 0 10px rgba(255, 42, 109, 0.4);
  pointer-events: none;
  z-index: 2;
}

.square.last-move { background: linear-gradient(135deg, #1a2a1a, #1a2f2a) !important; }

.square.in-check {
  background: linear-gradient(135deg, #3a0a0a, #2a0808) !important;
  box-shadow: inset 0 0 20px rgba(255, 42, 109, 0.4), 0 0 15px rgba(255, 42, 109, 0.3) !important;
  animation: checkPulse 1s infinite;
}

@keyframes checkPulse {
  0%, 100% { box-shadow: inset 0 0 20px rgba(255,42,109,0.4), 0 0 15px rgba(255,42,109,0.3); }
  50%       { box-shadow: inset 0 0 30px rgba(255,42,109,0.6), 0 0 25px rgba(255,42,109,0.5); }
}

/* ---- Pieces ---- */
.piece {
  position: relative;
  z-index: 3;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  line-height: 1;
  transition: transform 0.15s;
}

.piece.white-piece {
  filter: drop-shadow(0 0 6px rgba(255, 215, 0, 0.7)) drop-shadow(0 2px 4px rgba(0,0,0,0.8));
}
.piece.black-piece {
  filter: drop-shadow(0 0 6px rgba(191, 95, 255, 0.7)) drop-shadow(0 2px 4px rgba(0,0,0,0.8));
}

.square:hover .piece { transform: translateY(-2px) scale(1.05); }

/* ---- AI Thinking Overlay ---- */
.thinking-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 16, 0.7);
  z-index: 20;
  border-radius: 2px;
  backdrop-filter: blur(2px);
}

.thinking-spinner {
  width: 40px; height: 40px;
  border: 2px solid rgba(191, 95, 255, 0.2);
  border-top: 2px solid var(--neon-purple);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ---- Promotion Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 16, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.modal {
  background: var(--panel-bg);
  border: 1px solid rgba(255, 215, 0, 0.3);
  border-radius: 4px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 0 40px rgba(255, 215, 0, 0.15);
}

.modal-title {
  font-family: 'Cinzel Decorative', serif;
  font-size: 1rem;
  color: var(--neon-gold);
  letter-spacing: 0.2em;
  margin-bottom: 16px;
  text-shadow: var(--glow-gold);
}

.promotion-choices {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.promo-btn {
  width: 64px; height: 64px;
  background: rgba(255, 215, 0, 0.05);
  border: 1px solid rgba(255, 215, 0, 0.3);
  border-radius: 4px;
  font-size: 2.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.promo-btn:hover {
  background: rgba(255, 215, 0, 0.15);
  border-color: var(--neon-gold);
  box-shadow: var(--glow-gold);
  transform: translateY(-2px);
}

/* ---- Utility ---- */
.hidden { display: none !important; }

::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0, 245, 255, 0.3); }