/* public/css/style.css */
:root {
  --bg: #0a0a0f;
  --surface: #13131a;
  --surface2: #1c1c28;
  --border: rgba(255,255,255,0.08);
  --gold: #c9a84c;
  --gold-light: #f0d080;
  --text: #e8e8f0;
  --text-dim: #7a7a9a;
  --white-piece: #f5f0e0;
  --black-piece: #1a1410;
  --success: #4caf7d;
  --danger: #e05555;
  --blue: #4a9eff;

  --radius: 12px;
  --radius-lg: 20px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, sans-serif;
  font-size: 14px;
  user-select: none;
  -webkit-user-select: none;
}

/* ─── LOADING ─────────────────────────────────────────────── */
#loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.5s ease;
}

.loading-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.chess-icon {
  font-size: 72px;
  animation: float 2s ease-in-out infinite;
  filter: drop-shadow(0 0 20px var(--gold));
  color: var(--gold);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.loading-inner h1 {
  font-family: 'Cinzel', serif;
  font-size: 32px;
  color: var(--gold);
  letter-spacing: 4px;
  text-shadow: 0 0 30px rgba(201,168,76,0.5);
}

.loading-bar {
  width: 200px;
  height: 3px;
  background: var(--surface2);
  border-radius: 2px;
  overflow: hidden;
}

.loading-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  border-radius: 2px;
  animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
  0% { width: 0%; }
  50% { width: 80%; }
  100% { width: 100%; }
}

.loading-text {
  color: var(--text-dim);
  font-size: 13px;
}

/* ─── SCREENS ────────────────────────────────────────────── */
.screen {
  position: fixed;
  inset: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.hidden { display: none !important; }

/* ─── MAIN MENU ──────────────────────────────────────────── */
#main-menu {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100%;
}

.menu-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(201,168,76,0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(74,158,255,0.06) 0%, transparent 60%);
  pointer-events: none;
}

.menu-content {
  position: relative;
  width: 100%;
  max-width: 400px;
  padding: 40px 24px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.logo { text-align: center; }
.logo-icon {
  font-size: 56px;
  color: var(--gold);
  filter: drop-shadow(0 0 20px rgba(201,168,76,0.6));
  display: block;
  margin-bottom: 8px;
}

.logo-title {
  font-family: 'Cinzel', serif;
  font-size: 36px;
  color: var(--gold);
  letter-spacing: 6px;
  text-shadow: 0 0 40px rgba(201,168,76,0.4);
}

.logo-sub {
  color: var(--text-dim);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-top: 4px;
}

/* Player Card */
.player-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
  width: 100%;
  max-width: 340px;
}

.player-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold), #8b6914);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--bg);
  flex-shrink: 0;
}

.player-info { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.player-name { font-weight: 600; font-size: 15px; }
.player-elo { color: var(--gold); font-size: 12px; font-weight: 500; }

/* Menu Buttons */
.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 340px;
}

/* ─── BUTTONS ────────────────────────────────────────────── */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 15px 24px;
  border: none;
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.3px;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--gold), #8b6914);
  color: #0a0a0f;
  box-shadow: 0 4px 20px rgba(201,168,76,0.3);
}

.btn-primary:hover { box-shadow: 0 4px 28px rgba(201,168,76,0.45); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: var(--surface2); }

.btn-danger {
  background: rgba(224,85,85,0.15);
  color: var(--danger);
  border: 1px solid rgba(224,85,85,0.3);
}

.btn-icon { font-size: 18px; }

/* ─── MODE SELECT ────────────────────────────────────────── */
#mode-select {
  background: var(--bg);
  padding: 0 0 32px;
}

.screen-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.back-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.back-btn:active { background: var(--surface2); }

.screen-header h2 {
  font-family: 'Cinzel', serif;
  font-size: 18px;
  color: var(--gold);
}

.mode-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 24px 20px;
}

.mode-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.mode-card:active { transform: scale(0.98); }
.mode-card:hover { border-color: var(--gold); box-shadow: 0 4px 20px rgba(201,168,76,0.1); }

.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(201,168,76,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.mode-icon { font-size: 40px; margin-bottom: 12px; }
.mode-card h3 { font-family: 'Cinzel', serif; font-size: 18px; color: var(--gold); margin-bottom: 6px; }
.mode-card p { color: var(--text-dim); font-size: 13px; }

.mode-badge {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 12px;
  background: rgba(74,158,255,0.15);
  color: var(--blue);
  border: 1px solid rgba(74,158,255,0.3);
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.mode-difficulty {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.diff-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.diff-btn.active {
  background: rgba(201,168,76,0.15);
  border-color: var(--gold);
  color: var(--gold);
}

/* ─── GAME SCREEN ────────────────────────────────────────── */
#game-screen {
  background: #000;
  overflow: hidden;
}

#chess-canvas {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
  touch-action: none;
}

/* HUD TOP */
.hud-top {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.7) 0%, transparent 100%);
  z-index: 10;
}

/* HUD BOTTOM */
.hud-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, transparent 100%);
  z-index: 10;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.hud-player {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hud-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.hud-player--white .hud-avatar { background: rgba(255,255,255,0.15); }
.hud-player--black .hud-avatar { background: rgba(0,0,0,0.5); border: 1px solid rgba(255,255,255,0.2); }

.hud-info { display: flex; flex-direction: column; }
.hud-name { font-size: 13px; font-weight: 600; color: #fff; line-height: 1.2; }
.hud-elo { font-size: 11px; color: var(--gold); }

.hud-clock {
  margin-left: auto;
  background: rgba(0,0,0,0.6);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  padding: 5px 10px;
  font-size: 15px;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  color: #fff;
  min-width: 60px;
  text-align: center;
}

.hud-clock.urgent { color: var(--danger); border-color: var(--danger); animation: pulse 1s infinite; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }

/* Status Bar */
.status-bar {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  pointer-events: none;
}

#status-text {
  display: inline-block;
  background: rgba(0,0,0,0.7);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  backdrop-filter: blur(8px);
  transition: opacity 0.3s;
}

#status-text.check { background: rgba(224,85,85,0.7); border-color: var(--danger); }
#status-text.hidden-status { opacity: 0; }

/* Captured */
.captured-row {
  position: absolute;
  left: 16px;
  right: 16px;
  height: 24px;
  z-index: 10;
  display: flex;
  gap: 2px;
  align-items: center;
}

#captured-black { top: 72px; }
#captured-white { bottom: 72px; }

.captured-piece {
  font-size: 16px;
  opacity: 0.7;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.5));
}

/* Game Controls */
.game-controls {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.ctrl-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(0,0,0,0.5);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  backdrop-filter: blur(8px);
}

.ctrl-btn:active { transform: scale(0.9); }
.ctrl-btn--danger { border-color: rgba(224,85,85,0.4); }

/* ─── MODALS ─────────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  max-width: 340px;
  width: 100%;
  text-align: center;
  animation: modal-in 0.25s ease;
}

.modal-content--wide { max-width: 420px; text-align: left; padding: 0; }

@keyframes modal-in {
  from { transform: scale(0.9) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.modal-icon { font-size: 56px; margin-bottom: 16px; }
.modal-content h2 { font-family: 'Cinzel', serif; font-size: 22px; color: var(--gold); margin-bottom: 8px; }
.modal-content p { color: var(--text-dim); font-size: 14px; margin-bottom: 20px; }

.elo-change {
  font-size: 20px;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 24px;
}

.elo-change.negative { color: var(--danger); }

.modal-buttons { display: flex; gap: 10px; flex-direction: column; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 { font-family: 'Cinzel', serif; color: var(--gold); font-size: 18px; margin: 0; }

.close-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  border-radius: 50%;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Leaderboard */
.leaderboard-list { padding: 16px 24px; max-height: 400px; overflow-y: auto; }

.leaderboard-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.leaderboard-item:last-child { border-bottom: none; }
.lb-rank { font-size: 20px; width: 32px; text-align: center; flex-shrink: 0; }
.lb-info { flex: 1; }
.lb-name { font-weight: 600; font-size: 14px; }
.lb-record { color: var(--text-dim); font-size: 12px; }
.lb-elo { font-size: 18px; font-weight: 700; color: var(--gold); }

/* Waiting spinner */
.spinner {
  font-size: 48px;
  animation: spin 2s linear infinite;
  display: inline-block;
  margin-bottom: 16px;
}

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

/* Promotion */
.promotion-pieces {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.promo-btn {
  width: 64px;
  height: 64px;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 36px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.promo-btn:hover { border-color: var(--gold); background: rgba(201,168,76,0.1); }

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Turn indicator */
.turn-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  margin-right: 6px;
}
.turn-dot.white { background: #f0f0e0; box-shadow: 0 0 6px rgba(255,255,255,0.6); }
.turn-dot.black { background: #333; border: 1px solid rgba(255,255,255,0.3); }

/* Active player highlight */
.hud-player.active .hud-clock {
  border-color: var(--gold);
  box-shadow: 0 0 10px rgba(201,168,76,0.3);
}