:root {
  --page-bg: #eee;
  --text: #333;
  --text-secondary: #666;
  --text-muted: #888;
  --card-bg: #fff;
  --card-shadow: rgba(0, 0, 0, 0.12);
  --border: #ccc;
  --border-light: #eee;
  --input-bg: #fff;
  --panel-bg: #fafafa;
  --code-bg: #f0f0f0;
  --overlay-bg: rgba(0, 0, 0, 0.55);
  --danger: #c0392b;
  --danger-border: #e0a29b;
  --danger-bg-hover: #fdecea;
  --btn-secondary-hover: #f0f0f0;
  --warning-bg: #fff6d8;
  --warning-border: #e0c34d;
  --gm-green: #2e8b46;
}

html.theme-dark {
  --page-bg: #1b1d20;
  --text: #eee;
  --text-secondary: #bbb;
  --text-muted: #888;
  --card-bg: #26292d;
  --card-shadow: rgba(0, 0, 0, 0.5);
  --border: #444;
  --border-light: #34383d;
  --input-bg: #1f2226;
  --panel-bg: #202226;
  --code-bg: #33373c;
  --overlay-bg: rgba(0, 0, 0, 0.7);
  --danger: #ff7a68;
  --danger-border: #7a3a33;
  --danger-bg-hover: #3a2422;
  --btn-secondary-hover: #33373c;
  --warning-bg: #3a3320;
  --warning-border: #7a692c;
  --gm-green: #4caf6a;
}

body.chess-page {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--page-bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 12px 60px;
  box-sizing: border-box;
  transition: background 0.2s, color 0.2s;
}

.hidden {
  display: none !important;
}

/* --- top bar / theme switch --- */

.top-bar {
  width: 100%;
  max-width: 700px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.chess-page h1 {
  color: var(--text);
  margin: 10px 0 20px;
  text-align: center;
  flex: 1;
}

#back-btn {
  text-decoration: none;
  white-space: nowrap;
}

.theme-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  user-select: none;
}

.theme-icon {
  font-size: 0.9rem;
}

.theme-switch input {
  display: none;
}

.theme-slider {
  width: 40px;
  height: 20px;
  background: var(--border);
  border-radius: 20px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}

.theme-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  top: 2px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
}

.theme-switch input:checked + .theme-slider {
  background: #567d46;
}

.theme-switch input:checked + .theme-slider::before {
  transform: translateX(20px);
}

/* --- warning banner / pseudo row --- */

.warning-banner {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 6px;
  max-width: 500px;
  text-align: center;
  font-size: 0.9rem;
}

.warning-banner a {
  color: var(--text);
  font-weight: bold;
}

.pseudo-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

#pseudo-display {
  font-weight: bold;
  color: var(--text);
}

/* --- layout: main column + presence sidebar --- */

.chess-layout {
  display: flex;
  gap: 20px;
  width: 100%;
  max-width: 700px;
  align-items: flex-start;
  justify-content: center;
}

.chess-main {
  flex: 1;
  min-width: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.presence-panel {
  width: 200px;
  flex-shrink: 0;
  background: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 4px 14px var(--card-shadow);
  padding: 16px;
  box-sizing: border-box;
  max-height: 420px;
  overflow-y: auto;
}

.presence-panel h2 {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0 0 10px;
}

#presence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}

#presence-list li {
  padding: 4px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.presence-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--text-muted);
}

.presence-dot.present {
  background: var(--gm-green);
}

.presence-dot.away {
  background: var(--text-muted);
}

.opponent-bar .presence-dot {
  margin-left: auto;
}

.presence-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (max-width: 700px) {
  .chess-layout {
    flex-direction: column;
    align-items: center;
  }

  .presence-panel {
    width: 100%;
    max-width: 420px;
    order: 2;
  }
}

.card {
  background: var(--card-bg);
  border-radius: 10px;
  box-shadow: 0 4px 14px var(--card-shadow);
  padding: 24px;
  width: 100%;
  max-width: 420px;
  box-sizing: border-box;
}

/* --- lobby --- */

#lobby .lobby-section {
  margin-bottom: 20px;
}

#resume-banner {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

#lobby h2 {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin: 0 0 10px;
}

#lobby input[type="text"] {
  padding: 10px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 140px;
  background: var(--input-bg);
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 2px;
  text-align: center;
}

.ai-color-choice {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.gm-badge {
  display: inline-block;
  border: 2px solid var(--gm-green);
  color: var(--gm-green);
  background: rgba(46, 139, 70, 0.08);
  font-weight: bold;
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 4px;
  letter-spacing: 1px;
  margin-right: 6px;
  vertical-align: middle;
}

.btn {
  padding: 10px 18px;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid #567d46;
  background: #6aa84f;
  color: #fff;
  border-radius: 5px;
}

.btn:hover {
  background: #5c9342;
}

.btn.secondary {
  background: var(--card-bg);
  color: var(--text-secondary);
  border-color: var(--border);
}

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

.btn.danger {
  background: var(--card-bg);
  color: var(--danger);
  border-color: var(--danger-border);
}

.btn.danger:hover {
  background: var(--danger-bg-hover);
}

.btn.small {
  padding: 4px 10px;
  font-size: 0.8rem;
}

#lobby-error,
.error-text {
  color: var(--danger);
  min-height: 1.2em;
  font-size: 0.9rem;
}

/* --- game --- */

#game {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.game-topbar {
  width: 100%;
  max-width: 400px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 8px;
}

.room-code-box {
  font-family: monospace;
  font-size: 1.1rem;
  background: var(--code-bg);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 4px;
  letter-spacing: 3px;
}

#conn-status {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.opponent-bar {
  width: 100%;
  max-width: 400px;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  background: var(--panel-bg);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 6px 10px;
  box-sizing: border-box;
}

.opponent-name {
  font-weight: 600;
  color: var(--text);
}

.owl-logo {
  width: 28px;
  height: 28px;
  margin-left: auto;
}

.board {
  width: 400px;
  max-width: 90vw;
  height: 400px;
  max-height: 90vw;
  margin: 8px 0;
}

.game-info {
  width: 100%;
  max-width: 400px;
  text-align: center;
  margin-bottom: 10px;
}

#status {
  font-weight: bold;
  color: var(--text);
  min-height: 1.4em;
}

#my-color {
  font-weight: normal;
  color: var(--text-secondary);
}

#premove-badge {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 2px;
}

.game-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 10px 0;
}

.moves-panel {
  width: 100%;
  max-width: 400px;
  background: var(--panel-bg);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 8px;
  max-height: 140px;
  overflow-y: auto;
  box-sizing: border-box;
}

#moves-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--text);
}

#moves-list li {
  display: flex;
  gap: 8px;
  padding: 2px 0;
}

.move-num {
  color: var(--text-muted);
  min-width: 28px;
}

.move-white,
.move-black {
  min-width: 60px;
}

/* --- promotion modal / end overlay / pseudo modal --- */

.overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.overlay-box {
  background: var(--card-bg);
  color: var(--text);
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  max-width: 320px;
}

#pseudo-input {
  padding: 10px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 100%;
  box-sizing: border-box;
  margin-top: 10px;
  background: var(--input-bg);
  color: var(--text);
}

.promo-choices {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 14px;
}

.promo-choices button {
  font-size: 1rem;
  padding: 10px 14px;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  color: var(--text);
}

.promo-choices button:hover {
  background: var(--btn-secondary-hover);
}

#end-message {
  font-size: 1.1rem;
  font-weight: bold;
  margin-bottom: 16px;
}

.end-controls {
  display: flex;
  gap: 10px;
  justify-content: center;
}