/* ==========================================================================
   Chess from Zero — by Enchantly
   --------------------------------------------------------------------------
   Layout: 3-column desktop grid (lesson panel · board · side panel).
   Theme: light/dark wood squares (Lichess defaults), Cinzel headers (matches
   Enchantly), Inter body. Hand-drawn SVG pieces inlined via pieces.js.
   ========================================================================== */

:root {
  --bg-page: #1d1429;
  --bg-card: #2a1d3e;
  --bg-card-2: #3a2a52;
  --text: #f4ebff;
  --text-2: rgba(244,235,255,0.78);
  --text-3: rgba(244,235,255,0.55);
  --text-muted: rgba(244,235,255,0.4);
  --accent: #ffd580;       /* gold — matches Enchantly Cinzel */
  --accent-2: #c88eff;
  --good: #6bffa5;
  --warn: #f97316;
  --danger: #ef4444;
  --board-light: #f0d9b5;  /* Lichess default light square */
  --board-dark:  #b58863;  /* Lichess default dark square */
  --board-frame: #2a1810;
  --highlight-move: rgba(255,213,128,0.45);
  --highlight-last: rgba(255,213,128,0.25);
  --highlight-check: rgba(239,68,68,0.55);
  --legal-dot: rgba(0,0,0,0.20);
  --legal-capture: rgba(239,68,68,0.45);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg-page);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  min-height: 100vh;
}
/* Subtle background atmosphere — matches Enchantly's painted style */
body {
  background:
    radial-gradient(ellipse at 20% 10%, rgba(200,142,255,0.08) 0, transparent 50%),
    radial-gradient(ellipse at 85% 90%, rgba(255,213,128,0.05) 0, transparent 50%),
    linear-gradient(180deg, #0d0518 0%, #1d1429 100%);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* TOP BAR -------------------------------------------------------------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 1px solid rgba(255,213,128,0.12);
  background: rgba(13,5,24,0.6);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
}
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark {
  font-size: 26px;
  color: var(--accent);
  filter: drop-shadow(0 0 12px rgba(255,213,128,0.4));
}
.brand-name {
  font-family: 'Cinzel', serif;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
}
.brand-by {
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.5px;
}
.topbar-right { display: flex; gap: 8px; align-items: center; }
.topbar-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  background: rgba(255,213,128,0.08);
  border: 1px solid rgba(255,213,128,0.25);
  border-radius: 999px;
  color: var(--accent);
  font-family: 'Inter', sans-serif;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.topbar-btn:hover { background: rgba(255,213,128,0.15); }

/* MAIN GRID ------------------------------------------------------------ */
.main-grid {
  display: grid;
  grid-template-columns: 320px 1fr 280px;
  gap: 28px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 28px;
  align-items: start;
}
@media (max-width: 1100px) {
  .main-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 18px;
  }
  .side-panel { order: 3; }
  .board-wrap { order: 2; }
  .lesson-panel { order: 1; position: static; }
}

/* MASCOT --------------------------------------------------------------- */
.mascot {
  position: relative;
  width: 90px;
  height: 110px;
  margin: -8px auto 4px;
  animation: mascotIdle 2.4s ease-in-out infinite;
  transition: transform 0.3s;
}
@keyframes mascotIdle {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50%      { transform: translateY(-3px) rotate(1deg); }
}
.mascot svg { width: 100%; height: 100%; overflow: visible; }
/* Mouth state visibility — only one is shown at a time per state class */
.mascot .mascot-mouth-idle, .mascot .mascot-mouth-happy,
.mascot .mascot-mouth-sad, .mascot .mascot-mouth-think { display: none; }
.mascot.mascot-idle .mascot-mouth-idle { display: inline; }
.mascot.mascot-happy .mascot-mouth-happy { display: inline; }
.mascot.mascot-sad .mascot-mouth-sad { display: inline; }
.mascot.mascot-thinking .mascot-mouth-think { display: inline; }
/* Happy: bigger bounce + cheek glow */
.mascot.mascot-happy { animation: mascotCheer 0.6s ease-out 2; }
@keyframes mascotCheer {
  0%, 100% { transform: translateY(0) rotate(0); }
  25%      { transform: translateY(-12px) rotate(-4deg); }
  50%      { transform: translateY(-6px) rotate(4deg); }
  75%      { transform: translateY(-10px) rotate(-2deg); }
}
/* Sad: tilt + slow */
.mascot.mascot-sad { animation: mascotSad 1.6s ease-in-out infinite; }
@keyframes mascotSad {
  0%, 100% { transform: translateY(0) rotate(-3deg); }
  50%      { transform: translateY(2px) rotate(-3deg); }
}
/* Thinking: hand-stroke beard / longer pondering */
.mascot.mascot-thinking { animation: mascotThink 1.8s ease-in-out infinite; }
@keyframes mascotThink {
  0%, 100% { transform: translateY(0) rotate(2deg); }
  50%      { transform: translateY(-2px) rotate(-2deg); }
}
.mascot .mascot-arm-right { transform-origin: 60px 75px; transition: transform 0.3s; }
.mascot.mascot-happy .mascot-arm-right {
  animation: mascotWave 0.5s ease-in-out 4;
  transform-origin: 30px 75px;
}
@keyframes mascotWave {
  0%, 100% { transform: rotate(0); }
  50%      { transform: rotate(-25deg); }
}
.mascot-bubble {
  position: absolute;
  top: 8px;
  right: -6px;
  background: #ffd580;
  color: #2a1810;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 800;
  padding: 4px 8px;
  border-radius: 10px 10px 10px 2px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.4);
  opacity: 0;
  transform: scale(0.6);
  transition: all 0.25s cubic-bezier(.4, 1.5, .6, 1);
  pointer-events: none;
  white-space: nowrap;
}
.mascot-bubble.show {
  opacity: 1;
  transform: scale(1);
}

/* LESSON PANEL --------------------------------------------------------- */
.lesson-panel {
  background: var(--bg-card);
  border: 1px solid rgba(255,213,128,0.18);
  border-radius: 14px;
  padding: 22px 22px 18px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
  position: sticky;
  top: 76px;
}
.lesson-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.lesson-num {
  font-family: 'Cinzel', serif;
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--accent);
  text-transform: uppercase;
}
.lesson-progress {
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}
.lesson-title {
  font-family: 'Cinzel', serif;
  font-size: 26px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--text);
  letter-spacing: 1px;
}
.lesson-desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-2);
  margin: 0 0 16px;
}
.lesson-objective {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: rgba(255,213,128,0.08);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  margin-bottom: 14px;
}
.objective-label {
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
}
.objective-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.5;
}
.lesson-feedback {
  min-height: 20px;
  margin-bottom: 14px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.5;
  display: none;
}
.lesson-feedback.show { display: block; }
.lesson-feedback.good {
  background: rgba(107,255,165,0.1);
  border-left: 3px solid var(--good);
  color: #b8ffd0;
}
.lesson-feedback.bad {
  background: rgba(239,68,68,0.1);
  border-left: 3px solid var(--danger);
  color: #ffb8b8;
}
.lesson-feedback.hint {
  background: rgba(95,224,255,0.1);
  border-left: 3px solid #5fe0ff;
  color: #b8e8ff;
}
.lesson-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.lesson-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 9px 12px;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s;
  white-space: nowrap;
}
.lesson-btn-primary {
  background: var(--accent);
  color: #2a1810;
}
.lesson-btn-primary:hover { background: #ffaa33; transform: translateY(-1px); }
.lesson-btn-primary:disabled {
  background: rgba(255,213,128,0.15);
  color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
}
.lesson-btn-secondary {
  background: transparent;
  border-color: rgba(255,213,128,0.3);
  color: var(--accent);
}
.lesson-btn-secondary:hover {
  background: rgba(255,213,128,0.1);
}

/* BOARD ---------------------------------------------------------------- */
.board-wrap {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}
.board-frame {
  position: relative;
  display: grid;
  grid-template-columns: 22px 1fr 22px;
  grid-template-rows: 22px 1fr 22px;
  background: var(--board-frame);
  padding: 0;
  border-radius: 8px;
  box-shadow:
    0 0 0 4px rgba(255,213,128,0.08),
    0 24px 50px rgba(0,0,0,0.55);
  width: min(640px, 90vmin);
}
.chess-board {
  grid-column: 2;
  grid-row: 2;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  aspect-ratio: 1;
  user-select: none;
  -webkit-user-select: none;
}
.square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.12s;
}
.square.light { background: var(--board-light); }
.square.dark  { background: var(--board-dark); }
.square.selected {
  background: var(--highlight-move) !important;
  box-shadow: inset 0 0 0 3px var(--accent);
}
.square.last-move {
  box-shadow: inset 0 0 0 3px var(--highlight-last);
}
.square.in-check {
  background: var(--highlight-check) !important;
  animation: checkPulse 0.6s ease-in-out 3;
}
@keyframes checkPulse {
  0%, 100% { box-shadow: inset 0 0 0 3px var(--danger); }
  50%      { box-shadow: inset 0 0 0 6px var(--danger); }
}
/* Legal-move indicator dots */
.square.legal-move::after {
  content: '';
  position: absolute;
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: var(--legal-dot);
  pointer-events: none;
}
.square.legal-capture::after {
  content: '';
  position: absolute;
  inset: 6%;
  border: 4px solid var(--legal-capture);
  border-radius: 50%;
  pointer-events: none;
  background: transparent;
}
/* Highlighted/hint squares for tutorial demos */
.square.hint-target {
  box-shadow: inset 0 0 0 4px #5fe0ff;
  animation: hintPulse 1.2s ease-in-out infinite;
}
@keyframes hintPulse {
  0%, 100% { box-shadow: inset 0 0 0 4px #5fe0ff; }
  50%      { box-shadow: inset 0 0 0 7px rgba(95,224,255,0.7); }
}

.piece {
  width: 92%;
  height: 92%;
  pointer-events: none;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,0.35));
  transition: transform 0.18s cubic-bezier(.4,0,.2,1);
}
.square.dragging .piece { opacity: 0.4; }

/* Drag ghost */
.drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 1000;
  width: 70px; height: 70px;
  filter: drop-shadow(0 6px 14px rgba(0,0,0,0.55));
}

/* Rank/file labels */
.board-rank-labels, .board-rank-labels-right {
  grid-row: 2;
  display: grid;
  grid-template-rows: repeat(8, 1fr);
  align-items: center;
  justify-items: center;
  font-family: 'Cinzel', serif;
  font-size: 11px;
  color: rgba(255,213,128,0.6);
  letter-spacing: 1px;
}
.board-rank-labels { grid-column: 1; }
.board-rank-labels-right { grid-column: 3; }
.board-file-labels, .board-file-labels-top {
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  align-items: center;
  justify-items: center;
  font-family: 'Cinzel', serif;
  font-size: 11px;
  color: rgba(255,213,128,0.6);
  letter-spacing: 1px;
}
.board-file-labels-top { grid-row: 1; }
.board-file-labels { grid-row: 3; }

/* Promotion picker */
.promotion-picker {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  gap: 4px;
  background: rgba(13,5,24,0.95);
  border: 2px solid var(--accent);
  border-radius: 10px;
  padding: 8px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.6);
  z-index: 20;
}
.promo-piece {
  width: 60px; height: 60px;
  font-size: 42px;
  background: var(--bg-card-2);
  color: var(--text);
  border: 1px solid rgba(255,213,128,0.2);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s;
}
.promo-piece:hover {
  background: var(--accent);
  color: #2a1810;
  transform: scale(1.06);
}

/* Game-over overlay */
.game-over {
  position: absolute;
  inset: 0;
  background: rgba(13,5,24,0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 30;
  border-radius: 8px;
  animation: fadeIn 0.3s ease-out;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.game-over-card {
  text-align: center;
  padding: 32px 36px;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  border-radius: 14px;
  max-width: 360px;
}
.game-over-icon {
  font-size: 56px;
  margin-bottom: 8px;
  filter: drop-shadow(0 4px 12px rgba(255,213,128,0.4));
}
.game-over-card h2 {
  font-family: 'Cinzel', serif;
  font-size: 26px;
  margin: 0 0 8px;
  color: var(--accent);
  letter-spacing: 2px;
}
.game-over-card p {
  margin: 0 0 18px;
  color: var(--text-2);
  font-size: 14px;
}
.game-over-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* SIDE PANEL ----------------------------------------------------------- */
.side-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: sticky;
  top: 76px;
}
.status-card, .moves-card, .ai-difficulty-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,213,128,0.12);
  border-radius: 12px;
  padding: 16px 18px;
}
.status-label {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.status-value {
  font-family: 'Cinzel', serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
}
.moves-list {
  display: grid;
  grid-template-columns: 28px 1fr 1fr;
  gap: 4px 10px;
  max-height: 280px;
  overflow-y: auto;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}
.moves-list .move-num { color: var(--text-muted); text-align: right; }
.moves-list .move-w, .moves-list .move-b { padding: 2px 4px; border-radius: 4px; }
.moves-list .move-w:hover, .moves-list .move-b:hover { background: rgba(255,213,128,0.1); }
.moves-list .move-last { background: rgba(255,213,128,0.18); color: var(--accent); }
.ai-level-select {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-card-2);
  color: var(--text);
  border: 1px solid rgba(255,213,128,0.2);
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-size: 12.5px;
  cursor: pointer;
}

/* LESSON MENU ---------------------------------------------------------- */
.lesson-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(13,5,24,0.85);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 20px;
}
.hidden { display: none !important; }
.lesson-menu-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,213,128,0.25);
  border-radius: 14px;
  padding: 26px 28px;
  max-width: 580px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}
.lesson-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}
.lesson-menu-header h2 {
  font-family: 'Cinzel', serif;
  font-size: 22px;
  margin: 0;
  color: var(--accent);
  letter-spacing: 2px;
}
.lesson-menu-close {
  width: 36px; height: 36px;
  background: transparent;
  border: 1px solid rgba(255,213,128,0.25);
  border-radius: 50%;
  color: var(--text);
  font-size: 22px;
  cursor: pointer;
  line-height: 1;
}
.lesson-menu-sub {
  font-size: 13px;
  color: var(--text-3);
  margin: 0 0 18px;
  line-height: 1.55;
}
.lesson-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.lesson-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  background: var(--bg-card-2);
  border: 1px solid rgba(255,213,128,0.1);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.15s;
}
.lesson-row:hover:not(.locked) {
  background: rgba(255,213,128,0.08);
  border-color: rgba(255,213,128,0.4);
}
.lesson-row.locked { opacity: 0.4; cursor: not-allowed; }
.lesson-row.current {
  background: rgba(255,213,128,0.15);
  border-color: var(--accent);
}
.lesson-row.completed { border-color: rgba(107,255,165,0.4); }
.lesson-row-icon {
  width: 36px; height: 36px;
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.lesson-row-info { flex: 1; min-width: 0; }
.lesson-row-title {
  font-family: 'Cinzel', serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
}
.lesson-row-desc {
  font-size: 11.5px;
  color: var(--text-3);
  margin-top: 2px;
}
.lesson-row-status {
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.lesson-row.completed .lesson-row-status { color: var(--good); }
.lesson-menu-reset {
  width: 100%;
  margin-top: 8px;
  font-size: 11px;
  opacity: 0.7;
}

/* FOOTER --------------------------------------------------------------- */
.footer {
  text-align: center;
  padding: 18px;
  font-size: 11.5px;
  color: var(--text-muted);
  border-top: 1px solid rgba(255,213,128,0.08);
  margin-top: 40px;
}
.footer-sep { margin: 0 6px; opacity: 0.5; }