/* ============================================================
   CHESS CLUB — Premium Stylesheet
   ============================================================ */

:root {
  --gold:        #c9a84c;
  --gold-light:  #e8d08a;
  --gold-dark:   #8b6914;
  --cream:       #f5efe0;
  --dark-wood:   #1a0f00;
  --mid-wood:    #2e1a00;
  --panel-bg:    #1c1108;
  --panel-border:#4a3010;
  --text-main:   #e8d5a0;
  --text-dim:    #8a7050;
  --green-dot:   #4caf50;
  --red-cap:     #e53935;
  --blue-last:   #1e88e5;
  --font-serif:  'Georgia', 'Times New Roman', serif;
  --font-sans:   'Segoe UI', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%;
  background: #0d0800;
  color: var(--text-main);
  font-family: var(--font-sans);
  overflow: hidden;
  user-select: none;
}

/* ============================================================
   SCREENS
   ============================================================ */
.screen { position: fixed; inset: 0; display: none; flex-direction: column; }
.screen.active { display: flex; }

/* ============================================================
   START SCREEN
   ============================================================ */
#startScreen {
  background:
    radial-gradient(ellipse at 50% 0%, #3d2200 0%, #0d0800 70%),
    url("data:image/svg+xml,%3Csvg width='200' height='200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  align-items: center;
  justify-content: center;
  overflow: auto;
}

.candle-left, .candle-right {
  position: absolute;
  bottom: 0;
  width: 12px;
  background: linear-gradient(to top, #b8860b, #daa520 80%, #fffacd);
  border-radius: 2px 2px 0 0;
}
.candle-left  { left: 12%; height: 120px; }
.candle-right { right: 12%; height: 140px; }
.candle-left::before, .candle-right::before {
  content: '🕯';
  position: absolute;
  top: -28px; left: 50%;
  transform: translateX(-50%);
  font-size: 28px;
  filter: drop-shadow(0 0 14px #ffaa00) drop-shadow(0 0 28px #ff6600);
  animation: flicker 2s ease-in-out infinite alternate;
}
@keyframes flicker {
  0%   { opacity: 1; transform: translateX(-50%) scale(1); }
  100% { opacity: 0.85; transform: translateX(-50%) scale(0.97); }
}

.start-inner {
  background: linear-gradient(160deg, #2a1a05 0%, #1a0f00 100%);
  border: 2px solid var(--gold-dark);
  border-radius: 16px;
  padding: 48px 56px;
  max-width: 540px;
  width: 92%;
  box-shadow: 0 0 60px #00000088, inset 0 1px 0 #c9a84c44;
  position: relative;
  z-index: 2;
}

.logo-wrap { text-align: center; margin-bottom: 36px; }
.logo-piece {
  font-size: 72px;
  line-height: 1;
  filter: drop-shadow(0 0 12px #c9a84c88);
  animation: glow-pulse 3s ease-in-out infinite;
}
@keyframes glow-pulse {
  0%, 100% { filter: drop-shadow(0 0 10px #c9a84c88); }
  50%       { filter: drop-shadow(0 0 24px #c9a84ccc); }
}
.logo-title {
  font-family: var(--font-serif);
  font-size: 42px;
  color: var(--gold);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-top: 8px;
  text-shadow: 0 2px 8px #00000080;
}
.logo-sub {
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 2px;
  margin-top: 6px;
  font-style: italic;
}

.form-block { margin-bottom: 28px; }
.form-block label {
  display: block;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold-dark);
  margin-bottom: 10px;
}
.form-block input {
  width: 100%;
  background: #0d0800;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 10px 14px;
  color: var(--cream);
  font-size: 15px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}
.form-block input:focus { border-color: var(--gold); }

.diff-btns { display: flex; gap: 10px; }
.diff-btn {
  flex: 1;
  background: #0d0800;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 12px 8px;
  color: var(--text-dim);
  cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  transition: all 0.2s;
  font-family: var(--font-sans);
}
.diff-btn:hover { border-color: var(--gold-dark); color: var(--text-main); }
.diff-btn.selected {
  border-color: var(--gold);
  background: #2a1a05;
  color: var(--gold-light);
  box-shadow: 0 0 12px #c9a84c33;
}
.diff-icon { font-size: 20px; }
.diff-name { font-size: 13px; font-weight: 600; }
.diff-desc { font-size: 10px; color: var(--text-dim); text-align: center; }

.btn-primary {
  width: 100%;
  background: linear-gradient(135deg, #c9a84c 0%, #8b6914 100%);
  border: none;
  border-radius: 8px;
  padding: 14px;
  color: #1a0f00;
  font-size: 16px;
  font-weight: 700;
  font-family: var(--font-serif);
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 16px #c9a84c44;
}
.btn-primary:hover {
  background: linear-gradient(135deg, #e8d08a 0%, #c9a84c 100%);
  box-shadow: 0 4px 24px #c9a84c66;
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  width: 100%;
  background: transparent;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 12px;
  color: var(--text-dim);
  font-size: 14px;
  font-family: var(--font-sans);
  cursor: pointer;
  margin-top: 10px;
  transition: all 0.2s;
}
.btn-secondary:hover { border-color: var(--gold-dark); color: var(--text-main); }

/* ============================================================
   GAME SCREEN
   ============================================================ */
#gameScreen {
  background: #0d0800;
  flex-direction: column;
}

/* TOP BAR */
#topBar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  background: linear-gradient(to bottom, #2a1a05, #1a0f00);
  border-bottom: 1px solid var(--panel-border);
  height: 48px;
  flex-shrink: 0;
  z-index: 10;
}
.player-info {
  display: flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 600; color: var(--gold-light);
}
.player-info.right { flex-direction: row-reverse; }
.clock {
  font-family: 'Courier New', monospace;
  font-size: 13px;
  background: #0d0800;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--panel-border);
  color: var(--gold);
}
#centerInfo {
  text-align: center;
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 1px;
}
#statusMsg { font-weight: 600; color: var(--text-main); }

/* MAIN LAYOUT */
#mainLayout {
  flex: 1;
  display: flex;
  min-height: 0;
  padding: 12px;
  gap: 12px;
}

/* SIDEBARS */
.sidebar {
  width: 180px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
@media (max-width: 900px) {
  .sidebar { width: 120px; }
}
@media (max-width: 700px) {
  .sidebar { display: none; }
}

.sidebar-section {
  background: linear-gradient(160deg, #201200, #150c00);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 12px;
}
.sidebar-title {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold-dark);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--panel-border);
}
.sidebar-controls { display: flex; flex-direction: column; gap: 6px; }
.btn-ctrl {
  background: #0d0800;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text-dim);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
  text-align: left;
}
.btn-ctrl:hover { border-color: var(--gold-dark); color: var(--text-main); background: #1a1000; }
.btn-ctrl:disabled { opacity: 0.3; cursor: not-allowed; }

.captured-label {
  font-size: 10px;
  color: var(--text-dim);
  margin-bottom: 4px;
  margin-top: 6px;
}
.captured-row {
  min-height: 22px;
  font-size: 16px;
  letter-spacing: 2px;
  color: var(--text-main);
  word-break: break-all;
  line-height: 1.3;
}

.move-history {
  flex: 1;
  overflow-y: auto;
  font-size: 12px;
  font-family: 'Courier New', monospace;
  color: var(--text-dim);
  scroll-behavior: smooth;
}
.move-history::-webkit-scrollbar { width: 4px; }
.move-history::-webkit-scrollbar-track { background: transparent; }
.move-history::-webkit-scrollbar-thumb { background: var(--panel-border); border-radius: 2px; }
.move-row { display: flex; gap: 4px; padding: 2px 0; border-bottom: 1px solid #1a1000; }
.move-num { color: var(--gold-dark); min-width: 22px; }
.move-w { color: var(--cream); min-width: 54px; }
.move-b { color: #aaa; }

.diff-label-display {
  font-size: 13px;
  color: var(--gold);
  font-weight: 600;
  letter-spacing: 1px;
}

/* BOARD WRAP */
#boardWrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
}
#chessCanvas {
  display: block;
  cursor: pointer;
  touch-action: none;
}

/* ============================================================
   OVERLAYS
   ============================================================ */
.overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
  backdrop-filter: blur(3px);
}
.overlay.hidden { display: none; }

.overlay-box {
  background: linear-gradient(160deg, #2a1a05, #1a0f00);
  border: 2px solid var(--gold-dark);
  border-radius: 16px;
  padding: 40px 48px;
  text-align: center;
  box-shadow: 0 0 60px #00000088;
  min-width: 300px;
}
.overlay-box h2 {
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--gold);
  margin-bottom: 12px;
}
.overlay-box p { color: var(--text-dim); margin-bottom: 24px; font-size: 15px; }

.go-icon {
  font-size: 64px;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 16px #c9a84caa);
}

.promo-box { padding: 32px 40px; }
.promo-choices {
  display: flex; gap: 12px; justify-content: center; margin-top: 16px;
}
.promo-choice {
  font-size: 48px;
  cursor: pointer;
  padding: 10px;
  border-radius: 8px;
  border: 2px solid var(--panel-border);
  background: #0d0800;
  transition: all 0.15s;
  line-height: 1;
}
.promo-choice:hover { border-color: var(--gold); background: #2a1a05; transform: scale(1.1); }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes check-flash {
  0%, 100% { box-shadow: none; }
  50% { box-shadow: 0 0 0 4px #e53935; }
}