/* BJC Chess Lessons — Front-end styles */
:root {
  --bjc-bg: #f7f5f0;
  --bjc-surface: #ffffff;
  --bjc-border: #e2ddd6;
  --bjc-text: #1a1714;
  --bjc-text-2: #6b6560;
  --bjc-text-3: #a09890;
  --bjc-accent: #1a3a5c;
  --bjc-accent-light: #e8eef5;
  --bjc-board-light: #f0d9b5;
  --bjc-board-dark: #b58863;
  --bjc-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --bjc-mono: 'Courier New', monospace;
  --bjc-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.06);
}

.bjc-chess-root { font-family: var(--bjc-font); color: var(--bjc-text); line-height: 1.5; }
.bjc-chess-root * { box-sizing: border-box; }
.bjc-chess-root button { font-family: var(--bjc-font); cursor: pointer; border: none; background: none; }

/* Library */
.bjc-library { background: var(--bjc-bg); min-height: 400px; }
.bjc-library-hero { background: var(--bjc-accent); padding: 28px 24px; border-radius: 8px 8px 0 0; margin-bottom: 20px; }
.bjc-library-hero h2 { color: #fff; margin: 0 0 6px; font-size: 22px; }
.bjc-library-hero p  { color: rgba(255,255,255,0.8); margin: 0; font-size: 14px; }
.bjc-filter-bar { display: flex; gap: 8px; flex-wrap: wrap; padding: 0 0 16px; align-items: center; }
.bjc-filter-btn { padding: 5px 16px; border-radius: 20px; font-size: 13px; font-weight: 600; border: 1px solid var(--bjc-border); background: var(--bjc-surface); color: var(--bjc-text-2); cursor: pointer; transition: all .15s; }
.bjc-filter-btn.active { background: var(--bjc-accent); color: #fff; border-color: var(--bjc-accent); }
.bjc-search { padding: 6px 12px; border-radius: 6px; border: 1px solid var(--bjc-border); font-size: 13px; margin-left: auto; width: 180px; }
.bjc-category-section { margin-bottom: 24px; }
.bjc-category-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.bjc-category-header span { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--bjc-text-3); }
.bjc-category-header hr { flex: 1; border: none; border-top: 1px solid var(--bjc-border); }
.bjc-lessons-list { background: var(--bjc-surface); border: 1px solid var(--bjc-border); border-radius: 10px; overflow: hidden; box-shadow: var(--bjc-shadow); }
.bjc-lesson-row { display: flex; align-items: center; gap: 16px; padding: 14px 18px; border-bottom: 1px solid var(--bjc-border); cursor: pointer; transition: background .15s; }
.bjc-lesson-row:last-child { border-bottom: none; }
.bjc-lesson-row:hover { background: var(--bjc-bg); }
.bjc-lesson-miniboard { width: 44px; height: 44px; flex-shrink: 0; background-image: repeating-conic-gradient(#c8a97e 0% 25%, #f0d9b5 0% 50%) 0 0 / 11px 11px; border: 1px solid #8a7055; border-radius: 3px; }
.bjc-lesson-info { flex: 1; min-width: 0; }
.bjc-lesson-title { font-size: 15px; font-weight: 600; margin-bottom: 3px; }
.bjc-lesson-desc  { font-size: 13px; color: var(--bjc-text-2); }
.bjc-lesson-meta  { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; flex-shrink: 0; }
.bjc-diff-badge   { font-size: 11px; font-weight: 600; padding: 2px 10px; border-radius: 12px; }
.bjc-diff-beginner     { background: #e8eef5; color: #1a3a5c; }
.bjc-diff-intermediate { background: #fef3e8; color: #8a4a1a; }
.bjc-diff-advanced     { background: #fbeaea; color: #6a2d2d; }
.bjc-move-count { font-size: 12px; color: var(--bjc-text-3); }
.bjc-lesson-arrow { font-size: 20px; color: var(--bjc-accent); margin-left: 4px; }

/* Viewer */
.bjc-viewer { display: flex; flex-direction: column; background: var(--bjc-bg); }
.bjc-viewer-nav { height: 52px; background: var(--bjc-surface); border-bottom: 1px solid var(--bjc-border); display: flex; align-items: center; padding: 0 20px; gap: 14px; }
.bjc-back-btn { display: flex; align-items: center; gap: 6px; color: var(--bjc-accent); font-weight: 600; font-size: 13px; padding: 5px 12px; border-radius: 6px; background: var(--bjc-accent-light); cursor: pointer; }
.bjc-viewer-title { font-size: 15px; font-weight: 700; }
.bjc-viewer-meta  { font-size: 12px; color: var(--bjc-text-2); }
.bjc-progress-wrap { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.bjc-progress-bar  { width: 100px; height: 6px; background: var(--bjc-border); border-radius: 3px; overflow: hidden; }
.bjc-progress-fill { height: 100%; background: var(--bjc-accent); border-radius: 3px; transition: width .3s; }
.bjc-progress-label { font-size: 12px; color: var(--bjc-text-2); font-family: var(--bjc-mono); min-width: 70px; }

.bjc-viewer-body { display: flex; gap: 0; flex: 1; overflow: hidden; }

/* Board panel */
.bjc-board-panel { display: flex; flex-direction: column; align-items: center; padding: 20px 24px; gap: 14px; flex-shrink: 0; }
.bjc-board-wrap { border: 3px solid #6b4f2a; border-radius: 4px; overflow: hidden; box-shadow: 0 6px 28px rgba(0,0,0,.22); }
.bjc-board-controls { display: flex; gap: 8px; align-items: center; }
.bjc-ctrl-btn { width: 38px; height: 38px; border-radius: 6px; border: 1px solid var(--bjc-border); background: var(--bjc-surface); font-size: 15px; display: flex; align-items: center; justify-content: center; transition: all .15s; }
.bjc-ctrl-btn:disabled { opacity: .4; cursor: default; }
.bjc-play-btn { width: 42px; height: 42px; border-radius: 21px; border: 2px solid var(--bjc-accent); font-size: 16px; display: flex; align-items: center; justify-content: center; transition: all .15s; }
.bjc-play-btn.playing { background: var(--bjc-accent); color: #fff; }
.bjc-play-btn:not(.playing) { background: var(--bjc-surface); color: var(--bjc-accent); }

.bjc-coach-box { border-left: 6px solid var(--bjc-border); border-radius: 0 10px 10px 0; padding: 14px 18px; transition: all .3s; min-height: 90px; }
.bjc-coach-box.has-comment { background: #fffbf0; border-left-color: #c8a020; box-shadow: 0 2px 12px rgba(200,160,32,.1); }
.bjc-coach-box.empty { background: var(--bjc-surface); border-color: var(--bjc-border); }
.bjc-coach-label { font-size: 11px; font-weight: 700; color: #8a6a10; text-transform: uppercase; letter-spacing: .07em; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.bjc-coach-move-badge { margin-left: auto; font-family: var(--bjc-mono); font-size: 13px; font-weight: 600; background: #f0e0a0; color: #5a4a10; padding: 2px 10px; border-radius: 12px; }
.bjc-coach-text { font-size: 15px; color: #3a2a08; line-height: 1.7; font-style: italic; }
.bjc-coach-empty { display: flex; align-items: center; gap: 12px; color: var(--bjc-text-3); font-style: italic; font-size: 13px; }
.bjc-turn-indicator { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--bjc-text-2); }
.bjc-turn-dot { width: 16px; height: 16px; border-radius: 50%; border: 2px solid #8a7055; }

/* Move list panel */
.bjc-movelist-panel { flex: 1; border-left: 1px solid var(--bjc-border); display: flex; flex-direction: column; overflow: hidden; min-width: 260px; }
.bjc-movelist-header { padding: 14px 16px 12px; border-bottom: 1px solid var(--bjc-border); flex-shrink: 0; }
.bjc-movelist-header h3 { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--bjc-text-2); margin: 0 0 2px; }
.bjc-movelist-header p  { font-size: 12px; color: var(--bjc-text-3); margin: 0; }
.bjc-movelist-scroll { flex: 1; overflow-y: auto; padding: 6px 0; }
.bjc-move-pair { border-bottom: 1px solid var(--bjc-border); }
.bjc-move-row   { display: flex; align-items: flex-start; }
.bjc-move-num   { width: 34px; padding: 8px 0 8px 14px; font-family: var(--bjc-mono); font-size: 12px; color: var(--bjc-text-3); flex-shrink: 0; }
.bjc-move-cell  { flex: 1; display: flex; flex-direction: column; border-left: 1px solid var(--bjc-border); }
.bjc-move-btn   { text-align: left; padding: 8px 10px; font-family: var(--bjc-mono); font-size: 14px; font-weight: 500; border-radius: 4px; transition: background .15s; color: var(--bjc-text); }
.bjc-move-btn:hover   { background: var(--bjc-bg); }
.bjc-move-btn.active  { background: var(--bjc-accent-light); color: var(--bjc-accent); font-weight: 700; }
.bjc-move-comment { margin: 0 8px 8px 10px; padding: 8px 12px; background: #fffbf0; border: 1px solid #e8d8a0; border-left: 3px solid #c8a020; border-radius: 0 4px 4px 0; font-size: 13px; color: #5a4a10; line-height: 1.55; }
.bjc-move-comment-label { font-size: 11px; font-weight: 600; color: #8a6a10; display: block; margin-bottom: 3px; }

/* Responsive */
@media (max-width: 700px) {
  .bjc-viewer-body { flex-direction: column; }
  .bjc-movelist-panel { border-left: none; border-top: 1px solid var(--bjc-border); min-height: 200px; }
  .bjc-board-panel { padding: 12px; }
}