:root {
  --bg-color: #2c2c2c;
  --text-color: #e0d6c8;
  --text-muted: #c8bea8;
  --label-color: #a89878;
  --card-bg: #3a3428;
  --card-border: #5a4f3a;
  --heading-color: #d4c5a0;
  --accent-color: #c4a35a;
  --btn-bg: #4a4030;
  --btn-hover: #5a4f3a;
  --btn-active: #6a5f4a;
  --btn-primary-bg: #8b6914;
  --btn-primary-hover: #a07a1a;
  --btn-primary-border: #a07a1a;
  --input-bg: #2c2820;
  --scoring-bg: #332e22;
  --dialog-backdrop: rgba(0, 0, 0, 0.6);
  --radio-accent: #c4a35a;
  --move-highlight: rgba(196, 163, 90, 0.35);
  --move-hover: rgba(196, 163, 90, 0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Setup Screen */
.setup-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  width: 100%;
}

.setup-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 40px;
  width: 380px;
  max-width: calc(100vw - 32px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.setup-card h1 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 28px;
  color: var(--heading-color);
  letter-spacing: 0.05em;
}

.form-group {
  margin-bottom: 20px;
}

.form-group > label:first-child {
  display: block;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 8px;
}

.radio-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.95rem;
}

input[type="radio"] {
  accent-color: var(--radio-accent);
}

input[type="number"],
input[type="text"] {
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: var(--text-color);
  padding: 6px 10px;
  width: 80px;
  font-size: 0.95rem;
}

input[type="number"]:focus,
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent-color);
}

.btn {
  background: var(--btn-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: var(--text-color);
  padding: 8px 16px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.15s;
}

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

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

.btn-primary {
  display: block;
  width: 100%;
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-border);
  padding: 12px;
  font-size: 1rem;
  font-weight: 600;
  margin-top: 8px;
}

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

/* Import SGF button / file input */
.import-group {
  border-top: 1px solid var(--card-border);
  padding-top: 20px;
}

.file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.btn-import {
  display: block;
  width: 100%;
  background: var(--btn-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: var(--text-color);
  padding: 10px 16px;
  cursor: pointer;
  font-size: 0.9rem;
  text-align: center;
  transition: background 0.15s;
}

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

/* Setup section groups */
.setup-section-group {
  margin-top: 16px;
  border-top: 1px solid var(--card-border);
  padding-top: 14px;
}

.setup-section-header {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--label-color);
  margin-bottom: 8px;
}

.setup-section-buttons {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.setup-group-btn {
  width: 100%;
}

.setup-stats-btn {
  width: 100%;
  margin-top: 12px;
  border-style: dashed;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Checkbox accent */
input[type="checkbox"] {
  accent-color: var(--radio-accent);
}

/* Game Screen */
.game-screen {
  width: 100%;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.game-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.board-container {
  flex-shrink: 0;
  max-width: 100%;
}

#board-canvas {
  display: block;
  cursor: pointer;
  max-width: 100%;
  height: auto;
}

/* Info Panel */
.info-panel {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 20px;
  width: 220px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.turn-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  transition: opacity 0.2s ease-in-out;
}

.stone-icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  flex-shrink: 0;
}

.black-stone-icon {
  background: radial-gradient(circle at 35% 35%, #555, #000);
}

.white-stone-icon {
  background: radial-gradient(circle at 35% 35%, #fff, #ccc);
  border: 1px solid #999;
}

.captures-display {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.9rem;
}

.capture-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.move-number {
  font-size: 0.9rem;
}

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.action-buttons .btn {
  flex: 1 1 calc(50% - 3px);
  text-align: center;
  padding: 6px 8px;
  font-size: 0.85rem;
}

.action-buttons .btn:last-child:nth-child(odd) {
  flex-basis: 100%;
}

.move-list-container h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 6px;
}

.move-list {
  max-height: 300px;
  overflow-y: auto;
  font-size: 0.85rem;
  font-family: 'SF Mono', 'Menlo', 'Consolas', monospace;
  line-height: 1.6;
  color: var(--text-muted);
}

.move-list::-webkit-scrollbar {
  width: 6px;
}

.move-list::-webkit-scrollbar-track {
  background: transparent;
}

.move-list::-webkit-scrollbar-thumb {
  background: var(--card-border);
  border-radius: 3px;
}

/* Move list entry states */
.move-entry {
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
}

.move-entry:hover {
  background: var(--move-hover);
}

.move-entry.move-current {
  background: var(--move-highlight);
  font-weight: 600;
}

.move-entry.move-future {
  opacity: 0.4;
}

/* Disabled buttons */
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

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

/* Dialog overlay */
.dialog-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--dialog-backdrop);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.dialog-overlay.visible {
  display: flex;
}

.dialog-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 32px 40px;
  min-width: min(300px, calc(100vw - 32px));
  max-width: min(420px, calc(100vw - 32px));
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  text-align: center;
}

.dialog-card h2 {
  color: var(--heading-color);
  margin-bottom: 12px;
  font-size: 1.3rem;
}

.dialog-card p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 0.95rem;
  line-height: 1.5;
}

.dialog-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.dialog-actions .btn-primary {
  display: inline-block;
  width: auto;
}

/* Scoring Panel */
.scoring-panel {
  background: var(--scoring-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 14px;
}

.scoring-panel-header {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 10px;
}

.score-breakdown {
  margin-bottom: 12px;
}

.score-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  padding: 3px 0;
  color: var(--text-muted);
}

.score-total {
  border-top: 1px solid var(--card-border);
  margin-top: 4px;
  padding-top: 6px;
  font-weight: 600;
  color: var(--text-color);
}

.score-winner {
  text-align: center;
  font-weight: 700;
  color: var(--accent-color);
  margin-top: 6px;
  font-size: 0.9rem;
}

.scoring-actions {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}

.scoring-actions .btn {
  flex: 1;
  text-align: center;
  font-size: 0.85rem;
  padding: 6px 8px;
}

.scoring-actions .btn-primary {
  display: inline-block;
  width: auto;
  margin-top: 0;
}

.scoring-hint {
  font-size: 0.78rem;
  color: var(--label-color);
  text-align: center;
  font-style: italic;
}

/* Score table in game-over dialog */
.score-table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 0.9rem;
  text-align: left;
}

.score-table th,
.score-table td {
  padding: 4px 10px;
  border-bottom: 1px solid var(--card-border);
}

.score-table th {
  color: var(--label-color);
  font-size: 0.8rem;
  text-transform: uppercase;
}

.score-total-row {
  font-weight: 700;
  color: var(--text-color);
}

.score-total-row td {
  border-top: 2px solid var(--card-border);
  padding-top: 6px;
}

/* Settings Panel (inline collapsible) */
.settings-section {
  border-top: 1px solid var(--card-border);
  padding-top: 12px;
}

.settings-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--label-color);
  cursor: pointer;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0;
  width: 100%;
}

.settings-toggle:hover {
  color: var(--text-color);
}

.settings-toggle .gear-icon {
  font-size: 1rem;
}

.settings-body {
  display: none;
  padding-top: 10px;
}

.settings-body.open {
  display: block;
}

.settings-body .form-group {
  margin-bottom: 12px;
}

.settings-body .form-group > label:first-child {
  font-size: 0.78rem;
  margin-bottom: 6px;
}

.settings-body .radio-group {
  gap: 10px;
}

.settings-body .radio-group label {
  font-size: 0.85rem;
}

/* Analysis */
.analysis-panel-container {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 14px;
  width: 220px;
}

.analysis-header {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 8px;
}

.analysis-move-info {
  font-size: 0.9rem;
  margin-bottom: 10px;
  min-height: 2.5em;
}

.analysis-toggles {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.analysis-toggles label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.score-graph-canvas {
  border: 1px solid var(--card-border);
  border-radius: 8px;
  max-width: 100%;
}

/* Tutorial */
.tutorial-lesson-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tutorial-lesson-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--btn-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-color);
  font-size: 0.9rem;
  transition: background 0.15s;
}

.tutorial-lesson-item:hover {
  background: var(--btn-hover);
}

.tutorial-lesson-item .lesson-category {
  font-size: 0.75rem;
  color: var(--label-color);
  text-transform: uppercase;
}

.tutorial-lesson-item .lesson-check {
  color: var(--accent-color);
  font-size: 1.1rem;
}

.tutorial-panel {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 16px 20px;
  max-width: 480px;
  width: calc(100% - 40px);
  z-index: 500;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.tutorial-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.85rem;
  color: var(--label-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tutorial-text {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-color);
  margin-bottom: 12px;
}

.tutorial-feedback {
  font-size: 0.85rem;
  min-height: 1.2em;
  margin-bottom: 8px;
}

.tutorial-feedback.correct {
  color: #4caf50;
}

.tutorial-feedback.wrong {
  color: #f44336;
}

.tutorial-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.tutorial-actions .btn-primary {
  margin-top: 0;
}

/* Tsumego */
.tsumego-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.tsumego-tab {
  flex: 1;
  background: var(--btn-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: var(--text-muted);
  padding: 8px 4px;
  cursor: pointer;
  font-size: 0.85rem;
  text-align: center;
  transition: background 0.15s;
}

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

.tsumego-tab.active {
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-border);
  color: var(--text-color);
  font-weight: 600;
}

.tsumego-progress-summary {
  font-size: 0.82rem;
  color: var(--label-color);
  text-align: center;
  margin-bottom: 8px;
}

/* Stats */
.stats-content { display: flex; flex-direction: column; gap: 8px; }
.stats-card { background: var(--btn-bg); border: 1px solid var(--card-border); border-radius: 6px; padding: 10px 14px; }
.stats-label { font-size: 0.78rem; color: var(--label-color); text-transform: uppercase; margin-bottom: 2px; }
.stats-value { font-size: 1.3rem; font-weight: 600; color: var(--text-color); }
.stats-row { display: flex; justify-content: space-between; font-size: 0.85rem; padding: 4px 0; border-bottom: 1px solid var(--card-border); }
.stats-row:last-child { border-bottom: none; }

/* Connection status */
.connection-status {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 4px;
  text-align: center;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.connection-status.connected {
  background: rgba(76, 175, 80, 0.15);
  color: #4caf50;
}

.connection-status.disconnected {
  background: rgba(244, 67, 54, 0.15);
  color: #f44336;
}

/* Chat panel */
.chat-panel {
  border-top: 1px solid var(--card-border);
  padding-top: 12px;
}

.chat-panel h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 6px;
}

.chat-messages {
  max-height: 140px;
  overflow-y: auto;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-muted);
  margin-bottom: 6px;
  padding: 4px 0;
}

.chat-messages::-webkit-scrollbar {
  width: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--card-border);
  border-radius: 2px;
}

.chat-message {
  padding: 2px 0;
  word-break: break-word;
}

.chat-message.chat-local strong {
  color: var(--accent-color);
}

.chat-message.chat-remote strong {
  color: var(--text-color);
}

.chat-input-row {
  display: flex;
  gap: 4px;
}

.chat-input-row input {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: 4px;
  color: var(--text-color);
  padding: 5px 8px;
  font-size: 0.82rem;
}

.chat-input-row input:focus {
  outline: none;
  border-color: var(--accent-color);
}

.chat-input-row .btn {
  padding: 5px 10px;
  font-size: 0.78rem;
}

/* Touch & Mobile */
#board-canvas {
  touch-action: manipulation;
}

.game-screen {
  user-select: none;
  -webkit-user-select: none;
}

/* Touch preview stone indicator */
.touch-confirm-hint {
  text-align: center;
  font-size: 0.78rem;
  color: var(--label-color);
  font-style: italic;
  padding: 4px 0;
}

/* Responsive: tablet / landscape phone */
@media (max-width: 768px) {
  body {
    align-items: flex-start;
  }

  .game-screen {
    align-items: flex-start;
  }

  .tutorial-panel {
    bottom: 8px;
    padding: 12px 16px;
    max-height: 35vh;
    overflow-y: auto;
  }

  .game-layout {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .info-panel {
    width: 100%;
    max-width: 480px;
  }

  .action-buttons .btn {
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .scoring-actions .btn {
    min-height: 44px;
  }

  .dialog-card {
    padding: 24px 28px;
  }

  .move-entry {
    padding: 6px 8px;
  }

  .analysis-panel-container {
    width: 100%;
    max-width: 480px;
  }

  .chat-input-row .btn {
    min-height: 44px;
  }

  .tsumego-tab {
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .annotation-tool-btn {
    min-height: 44px;
    min-width: 44px;
  }
}

/* Responsive: landscape phone */
@media (max-width: 768px) and (orientation: landscape) {
  .game-screen {
    padding: 10px;
    align-items: flex-start;
  }

  .game-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 12px;
  }

  .info-panel {
    width: 200px;
    max-height: calc(100vh - 20px);
    max-height: calc(100dvh - 20px);
    overflow-y: auto;
    gap: 8px;
    padding: 10px;
    font-size: 0.85rem;
  }

  .info-panel .action-buttons .btn {
    min-height: 36px;
    font-size: 0.8rem;
    padding: 4px 6px;
  }

  .move-list {
    max-height: 80px;
  }
}

/* Zoom wrapper */
.board-zoom-wrapper {
  transform-origin: 0 0;
  will-change: transform;
}

/* Zoom control buttons */
.zoom-controls {
  position: absolute;
  bottom: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  z-index: 10;
}

.zoom-btn {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-color);
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.85;
  touch-action: manipulation;
}

.zoom-btn:active { opacity: 1; }
.zoom-btn:disabled { opacity: 0.3; }

/* Annotation toolbar */
.annotation-toolbar {
  border-top: 1px solid var(--card-border);
  padding-top: 12px;
}

.annotation-toolbar-header {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 8px;
}

.annotation-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 8px;
}

.annotation-tool-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  line-height: 1;
}

.annotation-tool-btn.active {
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-border);
  color: var(--text-color);
}

.annotation-label-select {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-bottom: 8px;
}

.annotation-label-btn {
  width: 28px;
  height: 28px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
}

.annotation-label-btn.active {
  background: var(--btn-primary-bg);
  border-color: var(--btn-primary-border);
  color: var(--text-color);
}

.annotation-comment-section {
  margin-bottom: 8px;
}

.annotation-comment-section label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--label-color);
  margin-bottom: 4px;
}

.annotation-comment-section textarea {
  width: 100%;
  min-height: 50px;
  background: var(--input-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  color: var(--text-color);
  padding: 6px 8px;
  font-size: 0.85rem;
  font-family: inherit;
  resize: vertical;
}

.annotation-comment-section textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

.annotation-comment-display {
  background: var(--scoring-bg);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Responsive: small phone */
@media (max-width: 480px) {
  .game-screen {
    padding: 10px;
  }

  .game-layout {
    gap: 12px;
  }

  .info-panel {
    padding: 14px;
    gap: 10px;
  }

  .move-list {
    max-height: 150px;
  }

  .setup-card {
    padding: 24px;
  }

  .dialog-card {
    padding: 24px;
  }
}