/* ══════════════════════════════════════════════════════
   CHESS PUZZLE BOARD
   ══════════════════════════════════════════════════════ */
.puzzle-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-4);
  margin-top: var(--s-4);
  max-width: 1080px;
  margin-left: auto;
  margin-right: auto;
}
.chess-board-wrap { position: relative; width: 100%; max-width: 480px; margin: 0 auto; }
.chess-board {
  display: grid; grid-template-columns: repeat(8, 1fr);
  border: 2px solid var(--border); border-radius: 6px; overflow: hidden;
  aspect-ratio: 1; user-select: none;
}
.chess-sq {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font-size: 0; position: relative; cursor: pointer; transition: background .15s;
}
.chess-sq .piece { font-size: clamp(24px, 5.5vw, 48px); line-height: 1; pointer-events: none; filter: drop-shadow(0 1px 2px rgba(0,0,0,.4)); }
.chess-sq.light { background: #b8b090; }
.chess-sq.dark { background: #6b8a5e; }
.chess-sq.selected { background: #f0c040 !important; }
.chess-sq.hint { background: rgba(240,192,64,.35) !important; }
.chess-sq.last-move { background: rgba(56,139,253,.25) !important; }
.chess-sq.correct { background: rgba(63,185,80,.35) !important; }
.chess-sq.wrong { background: rgba(248,81,73,.35) !important; }
.puzzle-info {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: var(--s-4);
}
.puzzle-rating { font-size: 1.6rem; font-weight: 900; color: var(--gold); }
.puzzle-themes { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.puzzle-theme-tag {
  background: var(--surface2); border: 1px solid var(--border-light);
  border-radius: 12px; padding: 2px 10px; font-size: var(--fs-1); color: var(--muted);
}
.puzzle-status { font-size: 1rem; font-weight: 700; margin: var(--s-3) 0; min-height: 28px; }
.puzzle-nav { display: flex; gap: var(--s-2); margin-top: var(--s-3); flex-wrap: wrap; }
.puzzle-btn {
  padding: 10px 16px;
  min-height: var(--touch);
  border-radius: 6px; font-weight: 600; font-size: var(--fs-2);
  cursor: pointer; transition: opacity .2s; border: 1px solid var(--border);
  background: var(--surface2); color: var(--text);
}
.puzzle-btn:hover { opacity: .8; }
.puzzle-btn.primary { background: var(--gold); color: var(--signal-ink); border-color: var(--gold); }
.puzzle-btn:disabled { opacity: .4; cursor: not-allowed; }
.puzzle-progress { display: flex; gap: 6px; margin: var(--s-3) 0; flex-wrap: wrap; }
.puzzle-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--surface3); border: 1px solid var(--border);
  transition: background .3s;
}
.puzzle-dot.solved { background: var(--green); border-color: var(--green); }
.puzzle-dot.failed { background: var(--red); border-color: var(--red); }
.puzzle-dot.current { border-color: var(--gold); box-shadow: 0 0 6px var(--gold); }
.puzzle-score { font-size: var(--fs-3); color: var(--muted); margin-top: 4px; }

/* History card */
.history-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: var(--s-4); margin-top: var(--s-4);
}
.history-card h3 { font-size: var(--fs-4); font-weight: 700; color: var(--gold); margin-bottom: var(--s-3); }
.history-event {
  padding: 10px 0; border-bottom: 1px solid var(--border-light);
  font-size: var(--fs-3); line-height: 1.5;
}
.history-event:last-child { border-bottom: none; }
.history-year { font-weight: 700; color: var(--blue); margin-right: 6px; }
.history-cat {
  display: inline-block; font-size: var(--fs-1); padding: 1px 6px; border-radius: 8px;
  text-transform: uppercase; letter-spacing: .5px; margin-left: 6px;
  background: var(--surface2); color: var(--muted); border: 1px solid var(--border-light);
}