/* style.css — Chess Opening Trainer main stylesheet */

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

:root {
  --bg-primary: #312e2b;
  --bg-secondary: #272421;
  --bg-surface: #3d3a37;
  --bg-hover: #4a4643;
  --text-primary: #d4d0c9;
  --text-secondary: #a09d98;
  --accent: #629924;
  --accent-hover: #7ab82f;
  --danger: #c62828;
  --danger-hover: #e53935;
  --border: #504d49;
  --white-move: #e0dcd6;
  --black-move: #b0ada8;
  --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;
}

html, body {
  height: 100%;
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
}

/* ── Nav Bar ── */
nav {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
}

nav a {
  display: inline-block;
  padding: 12px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

nav a:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Page Container ── */
#page-container {
  min-height: calc(100vh - 52px);
  padding: 16px;
}

/* ── Two-Panel Layout ── */
.study-body,
.browse-body,
.practice-body {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

/* ── Board Container ── (Chessground needs explicit dimensions) */
.board-container,
#study-board-container,
#practice-board-container,
.detail-board-container {
  width: 400px;
  height: 400px;
}

cg-board {
  width: 400px;
  height: 400px;
}

.detail-board-container,
.detail-board-container cg-board {
  width: 240px;
  height: 240px;
}

/* ── Buttons ── */
button {
  padding: 8px 16px;
  font-size: 14px;
  font-family: var(--font-main);
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

button:hover {
  background: var(--bg-hover);
  border-color: var(--text-secondary);
}

button.danger {
  color: var(--danger);
  border-color: var(--danger);
}

button.danger:hover {
  background: var(--danger);
  color: #fff;
}

button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

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

/* ── Inputs ── */
input[type="text"],
input[type="search"],
textarea,
select {
  padding: 6px 10px;
  font-size: 14px;
  font-family: var(--font-main);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Study Page ── */
.study-page {}

.study-board-area {}

.study-board-controls {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

.mark-start-btn {
  margin-top: 8px;
  display: block;
}

.study-status {
  margin-top: 8px;
  padding: 8px;
  background: var(--bg-surface);
  border-radius: 4px;
  min-height: 20px;
  font-size: 13px;
}

.study-sidebar {
  min-width: 280px;
  max-width: 400px;
}

.color-selector {
  margin-bottom: 12px;
}

.color-selector label {
  margin-right: 12px;
  cursor: pointer;
}

.study-move-list {
  min-height: 80px;
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  margin: 8px 0;
  background: var(--bg-secondary);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
}

.setup-move {
  color: var(--text-secondary);
  opacity: 0.6;
}

.start-divider {
  color: var(--accent);
  font-weight: bold;
  margin: 4px 0;
  font-family: var(--font-main);
  font-size: 12px;
}

.active-move {
  cursor: pointer;
}

.active-move:hover {
  text-decoration: underline;
}

.edit-reason-btn {
  cursor: pointer;
  border: none;
  background: none;
  font-size: 14px;
  padding: 0 2px;
  color: var(--text-secondary);
}

.edit-reason-btn:hover {
  color: var(--accent);
}

.move-list-header {
  font-weight: bold;
  font-size: 13px;
  color: var(--text-secondary);
}

.reason-area {
  margin: 8px 0;
}

.reason-area label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.reason-area input {
  width: 100%;
}

.study-actions {
  margin-top: 12px;
  display: flex;
  gap: 8px;
}

/* ── Practice Page ── */
.practice-page {
  position: relative;
}

.practice-sidebar {
  min-width: 280px;
  max-width: 400px;
}

.practice-message {
  padding: 8px 12px;
  background: var(--bg-surface);
  border-radius: 4px;
  margin-top: 8px;
  font-size: 13px;
}

.line-result-overlay,
.session-summary-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-secondary);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* ── Browse Page ── */
.browse-page {}

.browse-tree-panel {
  min-width: 320px;
  max-width: 500px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.browse-search {
  margin-bottom: 8px;
}

.browse-search input {
  width: 100%;
}

.browse-tree {
  min-height: 80px;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  background: var(--bg-secondary);
}

.browse-detail-panel {
  min-width: 280px;
  max-width: 450px;
}

.tree-node {
  padding: 3px 4px;
  cursor: pointer;
  border-radius: 3px;
}

.tree-node:hover {
  background: var(--bg-hover);
}

.tree-node.selected {
  background: var(--bg-surface);
  border-left: 3px solid var(--accent);
  padding-left: 6px;
}

.tree-toggle {
  cursor: pointer;
  font-size: 11px;
  display: inline-block;
  width: 16px;
  color: var(--text-secondary);
}

.tree-children {
  margin-left: 20px;
}

.tree-empty {
  color: var(--text-secondary);
  padding: 12px;
  font-style: italic;
}

.node-name {
  color: var(--accent);
  font-style: italic;
  margin-left: 4px;
}

.move-white {
  color: var(--white-move);
}

.move-black {
  color: var(--black-move);
}

.detail-empty {
  color: var(--text-secondary);
  padding: 16px;
  font-style: italic;
}

.detail-fields {
  margin-top: 8px;
}

.detail-fields label {
  display: block;
  margin-top: 10px;
  font-weight: 600;
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.detail-fields input[type="text"],
.detail-fields textarea {
  width: 100%;
  margin-top: 4px;
}

.detail-full-name {
  padding: 6px 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  font-size: 13px;
  margin-top: 4px;
}

.detail-reason {
  padding: 6px 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  font-size: 13px;
  margin-top: 4px;
}

.detail-stats {
  margin-top: 12px;
  display: flex;
  gap: 20px;
  font-size: 13px;
}

.detail-actions {
  margin-top: 16px;
  display: flex;
  gap: 8px;
}

/* ── Manage Page ── */
.manage-page {
  max-width: 700px;
}

.manage-section {
  margin-bottom: 24px;
  padding: 16px;
  background: var(--bg-surface);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.manage-section h2 {
  font-size: 16px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.manage-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.manage-stats {
  list-style: none;
  line-height: 2;
}

.manage-stats li::before {
  content: '•';
  margin-right: 8px;
  color: var(--accent);
}

.manage-status {
  margin-top: 12px;
  padding: 8px;
  border-radius: 4px;
  font-size: 13px;
  min-height: 20px;
}

.manage-settings label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 14px;
}

.manage-settings select,
.manage-settings input[type="number"] {
  width: 120px;
}

/* ── Board Square Highlights ── */
.cg-board .hint {
  background-color: rgba(22, 155, 0, 0.5);
  border-radius: 50%;
}

.cg-board .error {
  background-color: rgba(204, 0, 0, 0.5);
}

/* ── Responsive adjustments ── */
@media (max-width: 768px) {
  .board-container,
  #study-board-container,
  #practice-board-container,
  cg-board {
    width: 320px;
    height: 320px;
  }

  .study-body,
  .browse-body,
  .practice-body {
    flex-direction: column;
  }

  .study-sidebar,
  .practice-sidebar,
  .browse-tree-panel,
  .browse-detail-panel {
    max-width: 100%;
    min-width: auto;
  }

  nav a {
    padding: 10px 12px;
    font-size: 12px;
  }
}

/* ── Move Number ── */
.move-number {
  color: var(--text-secondary);
  font-size: 12px;
}

/* ── Promotion Dialog ── */
.promotion-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.promotion-overlay button {
  padding: 8px 14px;
  font-size: 16px;
  cursor: pointer;
}