:root {
  --bg-main: #0a0b0e;
  --bg-panel: #12141a;
  --bg-card: #1a1d26;
  --bg-card-hover: #232735;
  --accent-cross: #f5a623;
  --accent-f2l: #4f9eff;
  --accent-oll: #e84393;
  --accent-pll: #00d4aa;
  --accent-adv: #a78bfa;
  --text-main: #e8eaf0;
  --text-sub: #6b7080;
  --border: #2a2e3a;
}

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

html, body {
  height: 100%;
  background: var(--bg-main);
  color: var(--text-main);
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* === Header === */
.app-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.app-header .brand           { justify-self: start; }
.app-header .main-nav        { justify-self: center; }
.app-header .header-controls { justify-self: end; }
.brand { display: flex; align-items: baseline; gap: 10px; }
.logo { font-size: 22px; }
.title { font-size: 20px; font-weight: 700; letter-spacing: 1px; }
.subtitle { font-size: 12px; color: var(--text-sub); }

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mode-toggle {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 3px;
  gap: 2px;
}
.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-sub);
  padding: 5px 14px;
  font-size: 13px;
  border-radius: 16px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.mode-btn:hover { color: var(--text-main); }
.mode-btn.active[data-mode="forward"] {
  background: var(--accent-pll);
  color: #000;
  font-weight: 600;
}
.mode-btn.active[data-mode="reverse"] {
  background: var(--accent-cross);
  color: #000;
  font-weight: 600;
}

.mode-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  letter-spacing: 1px;
  font-weight: 600;
}
.mode-badge.mode-forward { background: var(--accent-pll); color: #000; }
.mode-badge.mode-reverse { background: var(--accent-cross); color: #000; }

.speed-control {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
}
.speed-label { font-size: 13px; color: var(--text-sub); }
#speed-slider { width: 140px; accent-color: var(--accent-f2l); }
.speed-value {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 13px;
  color: var(--accent-f2l);
  min-width: 36px;
  text-align: right;
}

/* === Main === */
.app-main {
  flex: 1;
  display: flex;
  min-height: 0;
}

.sidebar {
  width: 260px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px;
  flex-shrink: 0;
}

.category {
  margin-bottom: 8px;
  border-radius: 8px;
  overflow: hidden;
}
.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  cursor: pointer;
  user-select: none;
  background: var(--bg-card);
  font-weight: 600;
  letter-spacing: 1px;
}
.category-header:hover { background: var(--bg-card-hover); }
.category-header .arrow {
  font-size: 10px;
  color: var(--text-sub);
  transition: transform 0.2s;
}
.category.open .category-header .arrow { transform: rotate(90deg); }
.category-tag {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: auto;
  margin-right: 8px;
}
.tag-cross { background: var(--accent-cross); color: #000; }
.tag-f2l   { background: var(--accent-f2l);   color: #000; }
.tag-oll   { background: var(--accent-oll);   color: #fff; }
.tag-pll   { background: var(--accent-pll);   color: #000; }
.tag-adv   { background: var(--accent-adv);   color: #000; }
.tag-replay{ background: linear-gradient(135deg, #ffd700, #ffaa00); color: #000; }

.case-list {
  display: none;
  padding: 4px 0;
}
.category.open .case-list { display: block; }

.case-item {
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text-main);
  border-left: 3px solid transparent;
  transition: all 0.15s;
}
.case-item:hover {
  background: var(--bg-card);
  color: #fff;
}
.case-item.active {
  background: var(--bg-card-hover);
  border-left-color: var(--accent-f2l);
  color: var(--accent-f2l);
}
.case-item .case-alg {
  display: block;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 11px;
  color: var(--text-sub);
  margin-top: 2px;
}

/* === Stage === */
.stage {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}
.cube-canvas {
  width: 100%;
  height: 100%;
}
.hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-sub);
  font-size: 12px;
  pointer-events: none;
}

/* === Footer === */
.practice-footer {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  padding: 12px 20px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.formula-display {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.formula-label {
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 1px;
}
.formula-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}
.formula-moves {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 16px;
}
.move-token {
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border);
  transition: all 0.2s;
  min-width: 32px;
  text-align: center;
}
.move-token.done {
  background: var(--bg-card);
  color: var(--text-sub);
  opacity: 0.6;
}
.move-token.current {
  background: var(--accent-oll);
  color: #fff;
  border-color: var(--accent-oll);
  box-shadow: 0 0 14px rgba(232, 67, 147, 0.55);
  transform: scale(1.08);
}

.controls {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
}
.step-indicator {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 13px;
  color: var(--text-sub);
  margin-right: 16px;
}
.ctrl-btn {
  width: 44px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 16px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}
.ctrl-btn:hover:not(:disabled) {
  background: var(--bg-card-hover);
  color: #fff;
}
.ctrl-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.ctrl-play {
  width: 56px;
  background: var(--accent-oll);
  border-color: var(--accent-oll);
  color: #fff;
}
.ctrl-play:hover:not(:disabled) {
  filter: brightness(1.15);
  background: var(--accent-oll);
}

/* ============================================================
 * Multi-view system & main nav
 * ============================================================ */
.main-nav {
  display: flex;
  gap: 4px;
  background: var(--bg-card);
  padding: 4px;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.nav-tab {
  background: transparent;
  border: none;
  color: var(--text-sub);
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.nav-tab:hover { color: var(--text-main); }
.nav-tab.active { background: var(--accent-f2l); color: #000; }

.view {
  display: none;
  flex: 1;
  flex-direction: column;
  min-height: 0;
  width: 100%;
}
.view.active { display: flex; }

body:not([data-view="practice"]) #practice-header-controls { display: none; }

/* === Practice layout：包住 sidebar + stage + footer === */
#view-practice .practice-layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

/* ============================================================
 * Timer view
 * ============================================================ */
#view-timer { padding: 20px; overflow-y: auto; }

.timer-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 20px;
  min-height: 0;
}

.timer-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  min-height: 500px;
  padding: 20px;
}

.timer-scramble-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  padding: 14px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  max-width: 100%;
}
.timer-scramble {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 18px;
  letter-spacing: 1px;
  color: var(--accent-f2l);
  word-break: keep-all;
  white-space: pre-wrap;
}
.timer-newscramble {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-sub);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  flex-shrink: 0;
}
.timer-newscramble:hover { color: var(--text-main); border-color: var(--text-sub); }

.timer-display {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 140px;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1;
  color: var(--text-main);
  transition: color 0.1s;
  user-select: none;
}
.timer-display.inspection { color: var(--accent-cross); }
.timer-display.warn       { color: var(--accent-oll); }
.timer-display.danger     { color: #ff3030; }
.timer-display.ready      { color: #ff5050; }
.timer-display.primed     { color: var(--accent-pll); }
.timer-display.running    { color: var(--text-main); }
.timer-display.stopped    { color: var(--accent-pll); }

.timer-state-hint {
  color: var(--text-sub);
  font-size: 14px;
  letter-spacing: 1px;
  min-height: 20px;
}

.timer-options {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}
.opt-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-sub);
  cursor: pointer;
}
.opt-toggle input { accent-color: var(--accent-f2l); }
.quick-actions { display: flex; gap: 6px; }
.qa {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}
.qa:hover { background: var(--bg-card-hover); }
.qa-danger { color: #ff8a8a; }
.qa-danger:hover { background: #3a1818; border-color: #6a2020; }

.timer-side {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow: hidden;
  min-height: 0;
}
.timer-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  flex-shrink: 0;
}
.stat-block {
  background: var(--bg-card);
  border-radius: 8px;
  padding: 10px 12px;
  text-align: center;
}
.stat-label { font-size: 11px; color: var(--text-sub); letter-spacing: 1px; }
.stat-value {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}

.timer-history-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-height: 0;
}
.timer-history-header {
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 1px;
  padding: 0 4px;
}
.timer-history {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}
.history-empty {
  color: var(--text-sub);
  padding: 20px;
  text-align: center;
  font-size: 13px;
}
.solve-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
}
.solve-row:hover { background: var(--bg-card); }
.solve-num {
  color: var(--text-sub);
  width: 38px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 11px;
}
.solve-time {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  flex: 1;
  color: var(--text-main);
}
.solve-penalty {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}
.pen-plus2 { background: var(--accent-cross); color: #000; }
.pen-dnf   { background: #ff3030; color: #fff; }

@media (max-width: 880px) {
  .timer-layout { grid-template-columns: 1fr; }
  .timer-display { font-size: 96px; }
}

/* ============================================================
 * Trainer placeholder
 * ============================================================ */
.placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 40px;
  color: var(--text-sub);
  text-align: center;
}
.placeholder h2 { color: var(--text-main); font-size: 28px; }
.placeholder p { font-size: 16px; }
.placeholder-features {
  list-style: none;
  margin-top: 14px;
  background: var(--bg-card);
  padding: 18px 28px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 14px;
  line-height: 2;
  text-align: left;
}

/* ============================================================
 * Trainer view
 * ============================================================ */
#view-trainer { padding: 16px; overflow: hidden; }

.trainer-layout {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 14px;
  height: 100%;
  min-height: 0;
}

.trainer-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  flex-shrink: 0;
}
.trainer-select {
  padding: 8px 14px;
  background: var(--bg-panel);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  min-width: 220px;
}
.trainer-pool-info {
  color: var(--text-sub);
  font-size: 13px;
  margin-right: auto;
}

.trainer-body {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 14px;
  min-height: 0;
}

.trainer-cube-area {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  min-height: 320px;
}

.trainer-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  overflow-y: auto;
  min-height: 0;
}
.trainer-case-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
}
.trainer-alg-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.trainer-alg {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 13px;
  color: var(--accent-f2l);
  word-break: break-all;
  min-height: 36px;
}
.trainer-alg.hidden-alg {
  color: var(--text-sub);
  letter-spacing: 4px;
  text-align: center;
}

.trainer-timer-display {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 56px;
  font-weight: 700;
  text-align: center;
  color: var(--text-main);
  letter-spacing: -1px;
  line-height: 1;
  user-select: none;
}
.trainer-timer-display.ready    { color: #ff5050; }
.trainer-timer-display.primed   { color: var(--accent-pll); }
.trainer-timer-display.running  { color: var(--text-main); }
.trainer-timer-display.stopped  { color: var(--accent-pll); }

.trainer-state-hint {
  text-align: center;
  color: var(--text-sub);
  font-size: 12px;
  letter-spacing: 1px;
  min-height: 16px;
}

.trainer-actions {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 6px;
}

.trainer-case-stats { padding: 4px 0; }
.cs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.cs-grid > div {
  background: var(--bg-card);
  border-radius: 6px;
  padding: 8px 10px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}
.cs-label { color: var(--text-sub); }
.cs-val {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-weight: 700;
  color: var(--text-main);
}
.cs-empty {
  color: var(--text-sub);
  font-size: 12px;
  text-align: center;
  padding: 8px;
}

.trainer-heatmap {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  max-height: 200px;
  overflow-y: auto;
  flex-shrink: 0;
}
.trainer-heatmap-header {
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.heatmap-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hm-row {
  display: grid;
  grid-template-columns: 140px 1fr 50px 30px;
  gap: 8px;
  align-items: center;
  font-size: 12px;
  padding: 2px 4px;
  border-radius: 4px;
}
.hm-row:hover { background: var(--bg-card); }
.hm-name {
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.hm-bar-wrap {
  height: 10px;
  background: var(--bg-card);
  border-radius: 5px;
  overflow: hidden;
}
.hm-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cross), var(--accent-oll));
  transition: width 0.3s;
}
.hm-time {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  color: var(--text-main);
  text-align: right;
}
.hm-mistake { color: #ff8a8a; font-size: 11px; text-align: right; }
.hm-empty {
  color: var(--text-sub);
  font-size: 12px;
  text-align: center;
  padding: 16px;
}

@media (max-width: 880px) {
  .trainer-body { grid-template-columns: 1fr; }
}

/* ============================================================
 * Trainer — Recognition mode
 * ============================================================ */
.trainer-mode-toggle {
  display: flex;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
  margin-right: 4px;
}
.mode-pill {
  background: transparent;
  border: none;
  color: var(--text-sub);
  padding: 5px 12px;
  font-size: 13px;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  transition: all 0.15s;
}
.mode-pill:hover { color: var(--text-main); }
.mode-pill.active[data-mode="exec"] {
  background: var(--accent-pll);
  color: #000;
}
.mode-pill.active[data-mode="recognition"] {
  background: var(--accent-oll);
  color: #fff;
}

.hidden { display: none !important; }

/* Recognition panel */
.trainer-recog {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  overflow-y: auto;
  min-height: 0;
}
.recog-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
  letter-spacing: 1px;
}
.recog-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.recog-option {
  background: var(--bg-card);
  border: 2px solid var(--border);
  color: var(--text-main);
  padding: 14px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  text-align: center;
  min-height: 64px;
  word-break: break-word;
}
.recog-option:not(:disabled):hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-f2l);
  color: var(--accent-f2l);
  transform: translateY(-1px);
}
.recog-option.correct {
  background: rgba(0, 212, 170, 0.18);
  border-color: var(--accent-pll);
  color: var(--accent-pll);
}
.recog-option.wrong {
  background: rgba(255, 48, 48, 0.18);
  border-color: #ff3030;
  color: #ff8a8a;
}
.recog-option:disabled {
  cursor: not-allowed;
  transform: none;
}
.recog-feedback {
  text-align: center;
  font-size: 14px;
  min-height: 22px;
  font-weight: 600;
}
.recog-feedback .fb-ok { color: var(--accent-pll); }
.recog-feedback .fb-no { color: #ff8a8a; }
.recog-hint {
  font-size: 11px;
  color: var(--text-sub);
  text-align: center;
  letter-spacing: 1px;
  font-style: italic;
}
.recog-empty {
  color: var(--text-sub);
  text-align: center;
  padding: 16px;
  font-size: 13px;
}

/* ============================================================
 * Stage strip (Classic Replay 階段標籤)
 * ============================================================ */
.formula-stages {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  width: 100%;
  margin-bottom: 4px;
}
.stage-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 12px;
  letter-spacing: 0.5px;
  transition: all 0.2s;
}
.stage-pill-name { font-weight: 600; }
.stage-pill-count {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 10px;
  background: rgba(255,255,255,0.07);
  padding: 1px 5px;
  border-radius: 8px;
}
.stage-pill.done {
  color: var(--accent-pll);
  border-color: rgba(0, 212, 170, 0.3);
}
.stage-pill.current {
  background: var(--accent-cross);
  color: #000;
  border-color: var(--accent-cross);
  box-shadow: 0 0 12px rgba(245, 166, 35, 0.45);
  transform: scale(1.05);
}
.stage-pill.current .stage-pill-count {
  background: rgba(0, 0, 0, 0.18);
  color: #000;
}
.stage-arrow {
  color: var(--text-sub);
  font-size: 14px;
  margin: 0 2px;
}

/* ============================================================
 * Mock Comp mode
 * ============================================================ */
.timer-comp-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.timer-comp-status {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 13px;
  color: var(--accent-cross);
  background: rgba(245, 166, 35, 0.12);
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid rgba(245, 166, 35, 0.3);
}
.timer-comp-status b { color: #fff; }

.timer-comp-summary {
  background: var(--bg-card);
  border: 2px solid var(--accent-cross);
  border-radius: 12px;
  padding: 18px;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: 0 4px 20px rgba(245, 166, 35, 0.2);
}
.comp-summary-header {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-cross);
  text-align: center;
}
.comp-summary-ao5 {
  text-align: center;
  font-size: 16px;
  color: var(--text-main);
}
.comp-summary-ao5 b {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 22px;
  color: var(--accent-pll);
}
.comp-summary-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.comp-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  padding: 4px 8px;
  border-radius: 4px;
}
.comp-row:hover { background: var(--bg-panel); }
.comp-num {
  color: var(--text-sub);
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  width: 30px;
}
.comp-time {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  flex: 1;
  color: var(--text-main);
}
.comp-time small { color: var(--text-sub); font-size: 10px; }
.comp-summary-note {
  font-size: 11px;
  color: var(--text-sub);
  text-align: center;
  font-style: italic;
}

/* ============================================================
 * Goals dashboard
 * ============================================================ */
.timer-goals {
  background: var(--bg-card);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}
.goals-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 1px;
  font-weight: 600;
}
.goals-streak b { color: var(--accent-pll); font-family: 'JetBrains Mono', monospace; }

.goal-row {
  display: grid;
  grid-template-columns: 60px 1fr 60px 56px;
  gap: 6px;
  align-items: center;
  font-size: 12px;
}
.goal-label { color: var(--text-sub); }
.goal-bar-wrap {
  height: 8px;
  background: var(--bg-panel);
  border-radius: 4px;
  overflow: hidden;
}
.goal-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cross), var(--accent-pll));
  transition: width 0.4s;
}
.goal-current {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  color: var(--text-main);
  text-align: right;
  font-size: 11px;
}
.goal-target {
  width: 56px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  color: var(--text-main);
  border-radius: 4px;
  padding: 3px 6px;
  font-size: 11px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  text-align: right;
}
.goal-target:focus {
  outline: none;
  border-color: var(--accent-f2l);
}
.goal-row.reached {
  background: rgba(0, 212, 170, 0.08);
  border-radius: 4px;
}
.goal-row.reached .goal-bar { background: var(--accent-pll); }
.goal-row.reached .goal-current { color: var(--accent-pll); font-weight: 700; }

.goals-hint {
  font-size: 10px;
  color: var(--text-sub);
  text-align: center;
  font-style: italic;
  letter-spacing: 0.5px;
}

/* ============================================================
 * Case actions: favorite / mastery / alg variants
 * ============================================================ */
.case-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.case-action-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}
.case-action-btn:hover {
  background: var(--bg-card-hover);
  color: #fff;
}
.case-action-btn.active {
  background: linear-gradient(135deg, #ffd700, #ffaa00);
  color: #000;
  border-color: #ffaa00;
}

.case-mastery {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
}
.case-mastery:focus { outline: none; border-color: var(--accent-f2l); }

.case-alg-variants {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.case-alg-variants.hidden { display: none; }
.variant-chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.5px;
}
.variant-chip:hover {
  color: var(--text-main);
  border-color: var(--text-sub);
}
.variant-chip.active {
  background: var(--accent-f2l);
  color: #000;
  border-color: var(--accent-f2l);
  font-weight: 600;
}

/* Sidebar：favorite star + mastery 邊框 + 收藏分類標籤 */
.tag-fav { background: linear-gradient(135deg, #ffd700, #ffaa00); color: #000; }

.case-name {
  display: flex;
  align-items: center;
  gap: 4px;
}
.case-fav-star {
  font-size: 11px;
  width: 14px;
}

.case-item.mastery-learning { border-left-color: #f5a623 !important; }
.case-item.mastery-familiar { border-left-color: #4f9eff !important; }
.case-item.mastery-mastered { border-left-color: #00d4aa !important; }
.case-item.mastery-learning,
.case-item.mastery-familiar,
.case-item.mastery-mastered {
  border-left-style: solid;
  border-left-width: 3px;
}

/* ============================================================
 * Brand footer (公司資訊)
 * ============================================================ */
.brand-footer {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  color: var(--text-sub);
  font-size: 11px;
  letter-spacing: 0.5px;
  user-select: none;
}
.brand-footer-text {
  white-space: nowrap;
}
.brand-footer-sep {
  opacity: 0.4;
}
@media (max-width: 760px) {
  .brand-footer {
    flex-direction: column;
    gap: 2px;
  }
  .brand-footer-sep { display: none; }
}

/* ============================================================
 * F2L hint toggle button
 * ============================================================ */
#f2l-hint-toggle {
  font-size: 12px;
  white-space: nowrap;
}
#f2l-hint-toggle.active {
  background: linear-gradient(135deg, #ffd700, #ffaa00);
  color: #000;
  border-color: #ffaa00;
}
#f2l-hint-toggle.hidden { display: none; }

/* ============================================================
 * Solver view
 * ============================================================ */
#view-solver { padding: 24px; overflow-y: auto; }

.solver-layout {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.solver-intro h2 {
  color: var(--text-main);
  font-size: 22px;
  margin-bottom: 4px;
}
.solver-intro p {
  color: var(--text-sub);
  font-size: 13px;
}

.solver-main {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.solver-left {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.solver-palette {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--bg-card);
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.palette-swatch {
  width: 80px;
  padding: 8px 12px;
  border-radius: 6px;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  font-family: inherit;
  transition: all 0.15s;
}
.palette-swatch:hover { transform: translateY(-1px); }
.palette-swatch.selected {
  border-color: #fff;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.4);
  transform: scale(1.05);
}
.solver-legend {
  font-size: 11px;
  color: var(--text-sub);
  text-align: center;
  font-style: italic;
}

.solver-net {
  display: grid;
  grid-template-columns: repeat(12, 32px);
  grid-template-rows: repeat(9, 32px);
  gap: 2px;
  background: var(--bg-panel);
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.solver-sticker {
  width: 32px;
  height: 32px;
  border: 1px solid #1a1a1a;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.1s;
}
.solver-sticker:not(.center):hover {
  transform: scale(1.1);
  z-index: 1;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}
.solver-sticker.center {
  cursor: not-allowed;
  outline: 2px solid rgba(255, 255, 255, 0.4);
  outline-offset: -3px;
}

.solver-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.solver-solve-btn {
  background: var(--accent-pll);
  color: #000;
  border-color: var(--accent-pll);
  font-weight: 700;
  padding: 8px 22px;
}
.solver-solve-btn:hover { filter: brightness(1.15); }

.solver-output {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  min-height: 60px;
}
.solver-status {
  color: var(--text-sub);
  font-size: 14px;
  letter-spacing: 0.5px;
}
.solver-status.ok {
  color: var(--accent-pll);
  font-weight: 700;
  margin-bottom: 10px;
}
.solver-solution {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 16px;
}
.sol-move {
  background: var(--bg-card);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--accent-f2l);
  min-width: 32px;
  text-align: center;
}

/* ============================================================
 * Comp History panel
 * ============================================================ */
.timer-comp-history {
  background: var(--bg-card);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}
.timer-comp-history:empty { display: none; }

.comp-hist-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 1px;
  font-weight: 600;
}
.comp-hist-count {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  color: var(--accent-cross);
}

.comp-hist-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-panel);
  padding: 8px 12px;
  border-radius: 6px;
}
.comp-hist-best {
  font-size: 12px;
  color: var(--text-sub);
}
.comp-hist-best b {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  color: var(--accent-pll);
  font-size: 14px;
}
.comp-hist-spark {
  color: var(--accent-cross);
  display: flex;
  align-items: center;
}

.comp-hist-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 160px;
  overflow-y: auto;
}
.comp-hist-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
}
.comp-hist-row:hover { background: var(--bg-panel); }
.comp-hist-row.best {
  background: rgba(245, 166, 35, 0.12);
  border-left: 2px solid var(--accent-cross);
  padding-left: 6px;
}
.comp-hist-date {
  color: var(--text-sub);
  font-family: 'JetBrains Mono', 'Courier New', monospace;
}
.comp-hist-date small { opacity: 0.6; margin-left: 4px; }
.comp-hist-ao5 {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-weight: 700;
  color: var(--text-main);
}

/* ============================================================
 * Learning suggestions (Sidebar)
 * ============================================================ */
.tag-sug {
  background: linear-gradient(135deg, #4f9eff, #00d4aa);
  color: #000;
}
.case-item .case-alg:has-text("👉") { color: var(--accent-pll); }

/* 推薦分類的 case-item 邊框視覺加強 */
.category:first-child .case-item {
  border-left-color: rgba(79, 158, 255, 0.4);
}
.category:first-child .case-item:hover {
  border-left-color: var(--accent-f2l);
}


/* ============================================================
 * Dashboard view
 * ============================================================ */
#view-dashboard { padding: 20px; overflow-y: auto; }

.dash-layout {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dash-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.dash-title {
  color: var(--text-main);
  font-size: 22px;
}

/* === Stat cards === */
.dash-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.dash-stat-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 16px;
  text-align: center;
}
.dash-stat-value {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1;
}
.dash-stat-label {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 1px;
}
.tone-f2l   { color: var(--accent-f2l); }
.tone-pll   { color: var(--accent-pll); }
.tone-oll   { color: var(--accent-oll); }
.tone-cross { color: var(--accent-cross); }

/* === Two-column rows === */
.dash-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.dash-panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 180px;
}
.dash-panel-header {
  font-size: 13px;
  color: var(--text-sub);
  letter-spacing: 1px;
  font-weight: 600;
}
.dash-empty {
  color: var(--text-sub);
  font-size: 13px;
  text-align: center;
  padding: 24px;
  font-style: italic;
}

/* === Mastery breakdown === */
.mastery-row {
  display: grid;
  grid-template-columns: 70px 1fr 50px;
  gap: 10px;
  align-items: center;
}
.mastery-label {
  font-size: 13px;
  color: var(--text-main);
  font-weight: 600;
}
.mastery-label small {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-sub);
  font-weight: 400;
  font-size: 11px;
}
.mastery-bar {
  display: flex;
  height: 16px;
  background: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
}
.mastery-seg { transition: width 0.4s; }
.mastery-pct {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text-main);
  text-align: right;
}
.seg-mastered { background: var(--accent-pll); }
.seg-familiar { background: var(--accent-f2l); }
.seg-learning { background: var(--accent-cross); }

.mastery-legend {
  display: flex;
  justify-content: center;
  gap: 16px;
  font-size: 11px;
  color: var(--text-sub);
  margin-top: 4px;
}
.mastery-legend span { display: inline-flex; align-items: center; gap: 4px; }
.legend-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
}

/* === Activity heatmap === */
.activity-summary {
  font-size: 12px;
  color: var(--text-sub);
}
.activity-summary b { color: var(--text-main); font-family: 'JetBrains Mono', monospace; }
.activity-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
}
.activity-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  cursor: default;
}
.activity-cell.intensity-0 { background: rgba(255,255,255,0.04); color: var(--text-sub); }
.activity-cell.intensity-1 { background: rgba(0, 212, 170, 0.18); }
.activity-cell.intensity-2 { background: rgba(0, 212, 170, 0.42); }
.activity-cell.intensity-3 { background: rgba(0, 212, 170, 0.7); color: #000; }
.activity-cell.intensity-4 { background: var(--accent-pll); color: #000; }

.legend-swatch.intensity-0 { background: rgba(255,255,255,0.04); border: 1px solid var(--border); }
.legend-swatch.intensity-1 { background: rgba(0, 212, 170, 0.18); }
.legend-swatch.intensity-2 { background: rgba(0, 212, 170, 0.42); }
.legend-swatch.intensity-3 { background: rgba(0, 212, 170, 0.7); }
.legend-swatch.intensity-4 { background: var(--accent-pll); }

.activity-legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  font-size: 10px;
  color: var(--text-sub);
  margin-top: 4px;
}

/* === Weakness Top 5 === */
.weak-row {
  display: grid;
  grid-template-columns: 130px 1fr 50px 30px;
  gap: 8px;
  align-items: center;
  padding: 4px 4px;
  font-size: 12px;
}
.weak-name {
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.weak-bar {
  height: 10px;
  background: var(--bg-card);
  border-radius: 5px;
  overflow: hidden;
}
.weak-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cross), var(--accent-oll));
}
.weak-time {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-main);
  text-align: right;
}
.weak-mis { color: #ff8a8a; font-size: 11px; }

/* === Comp 戰績 === */
.comp-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.comp-stat {
  background: var(--bg-card);
  padding: 10px;
  border-radius: 8px;
  text-align: center;
}
.comp-stat-label {
  font-size: 11px;
  color: var(--text-sub);
  letter-spacing: 1px;
}
.comp-stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}
.comp-trend-label {
  font-size: 11px;
  color: var(--text-sub);
  letter-spacing: 1px;
  margin-top: 8px;
}
.comp-trend {
  color: var(--accent-cross);
}

@media (max-width: 760px) {
  .dash-stats { grid-template-columns: repeat(2, 1fr); }
  .dash-row { grid-template-columns: 1fr; }
  .activity-grid { grid-template-columns: repeat(6, 1fr); }
}

/* ============================================================
 * Achievements
 * ============================================================ */
.dash-achievements-panel {
  min-height: 0;
}
.ach-count {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  color: var(--accent-pll);
  font-weight: 700;
  margin-left: 8px;
}

.ach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 10px;
}
.ach-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  position: relative;
  transition: transform 0.15s, box-shadow 0.15s;
}
.ach-badge.unlocked {
  border-color: rgba(255, 215, 0, 0.4);
  background: linear-gradient(180deg, rgba(255,215,0,0.06), var(--bg-card));
}
.ach-badge.unlocked:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(255, 215, 0, 0.2);
}
.ach-badge.locked {
  opacity: 0.55;
  filter: grayscale(0.6);
}
.ach-icon {
  font-size: 28px;
  line-height: 1;
}
.ach-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}
.ach-desc {
  font-size: 11px;
  color: var(--text-sub);
  line-height: 1.3;
}
.ach-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-panel);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 4px;
}
.ach-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cross), var(--accent-pll));
  transition: width 0.4s;
}
.ach-progress {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 10px;
  color: var(--text-sub);
}

/* Tier 邊框色（解鎖時加強） */
.ach-badge.unlocked.tier-bronze   { border-color: #cd7f32; box-shadow: 0 0 0 1px rgba(205, 127, 50, 0.3) inset; }
.ach-badge.unlocked.tier-silver   { border-color: #c0c0c0; box-shadow: 0 0 0 1px rgba(192, 192, 192, 0.3) inset; }
.ach-badge.unlocked.tier-gold     { border-color: #ffd700; box-shadow: 0 0 0 1px rgba(255, 215, 0, 0.4) inset; }
.ach-badge.unlocked.tier-platinum {
  border-color: #b9f2ff;
  background: linear-gradient(180deg, rgba(185, 242, 255, 0.1), var(--bg-card));
  box-shadow: 0 0 14px rgba(185, 242, 255, 0.3);
}

/* ============================================================
 * Achievement Toast Notification
 * ============================================================ */
.achievement-toast {
  position: fixed;
  bottom: 70px;
  right: -400px;
  z-index: 9999;
  background: var(--bg-panel);
  border: 2px solid var(--accent-cross);
  border-radius: 12px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 280px;
  max-width: 360px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5), 0 0 24px rgba(255, 215, 0, 0.25);
  transition: right 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}
.achievement-toast.show { right: 24px; }

.achievement-toast.tier-bronze   { border-color: #cd7f32; box-shadow: 0 8px 28px rgba(0,0,0,0.5), 0 0 24px rgba(205, 127, 50, 0.4); }
.achievement-toast.tier-silver   { border-color: #c0c0c0; box-shadow: 0 8px 28px rgba(0,0,0,0.5), 0 0 24px rgba(192, 192, 192, 0.35); }
.achievement-toast.tier-gold     { border-color: #ffd700; box-shadow: 0 8px 28px rgba(0,0,0,0.5), 0 0 28px rgba(255, 215, 0, 0.5); }
.achievement-toast.tier-platinum { border-color: #b9f2ff; box-shadow: 0 8px 28px rgba(0,0,0,0.5), 0 0 32px rgba(185, 242, 255, 0.6); }

.achievement-toast .toast-icon {
  font-size: 36px;
  flex-shrink: 0;
}
.achievement-toast .toast-content { flex: 1; }
.achievement-toast .toast-header {
  font-size: 11px;
  color: var(--accent-cross);
  font-weight: 700;
  letter-spacing: 1px;
}
.achievement-toast .toast-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 2px;
}
.achievement-toast .toast-desc {
  font-size: 12px;
  color: var(--text-sub);
  margin-top: 2px;
}

/* ============================================================
 * Keyboard key styling
 * ============================================================ */
kbd {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: 0.5px;
  min-width: 22px;
  text-align: center;
}

.kbd-mouse {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: 4px;
  font-size: 11px;
  color: var(--text-sub);
}

/* ============================================================
 * First-time Welcome Banner
 * ============================================================ */
.welcome-banner {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: fadeIn 0.3s ease;
}
.welcome-banner.hidden { display: none; }

.welcome-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 32px;
  max-width: 720px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  animation: slideUp 0.4s cubic-bezier(0.2, 0.9, 0.3, 1.1);
}
.welcome-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  text-align: center;
}
.welcome-subtitle {
  font-size: 13px;
  color: var(--text-sub);
  text-align: center;
  margin-top: 6px;
  letter-spacing: 0.5px;
}

.welcome-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin: 22px 0;
}
.welcome-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 10px;
  cursor: pointer;
  font-family: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: all 0.15s;
  text-align: center;
}
.welcome-step:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-f2l);
  transform: translateY(-2px);
}
.ws-icon { font-size: 28px; line-height: 1; }
.ws-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}
.ws-desc {
  font-size: 11px;
  color: var(--text-sub);
  line-height: 1.4;
}

.welcome-tip {
  text-align: center;
  font-size: 12px;
  color: var(--text-sub);
  margin: 8px 0 18px;
}

.welcome-dismiss {
  display: block;
  margin: 0 auto;
  background: var(--accent-f2l);
  color: #000;
  border: none;
  padding: 10px 28px;
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s;
}
.welcome-dismiss:hover { filter: brightness(1.1); }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 720px) {
  .welcome-steps { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
 * Help overlay (?)
 * ============================================================ */
.help-overlay {
  position: fixed;
  inset: 0;
  z-index: 9500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.help-overlay.hidden { display: none; }

.help-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
}
.help-dialog {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0;
  max-width: 520px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
  animation: slideUp 0.3s cubic-bezier(0.2, 0.9, 0.3, 1.1);
}
.help-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.help-header h3 {
  color: var(--text-main);
  font-size: 16px;
  letter-spacing: 1px;
}
.help-close {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
}
.help-close:hover { color: #fff; background: var(--bg-card-hover); }

.help-body {
  padding: 16px 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.help-section h4 {
  font-size: 12px;
  color: var(--accent-f2l);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.help-rows {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.help-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-main);
}
.help-row:hover { background: var(--bg-card); }
.help-row kbd, .help-row .kbd-mouse {
  flex-shrink: 0;
  min-width: 60px;
}

.help-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 11px;
  color: var(--text-sub);
}

/* Help trigger button (fixed bottom-left，避開右下成就 toast) */
.help-trigger {
  position: fixed;
  bottom: 50px;
  left: 18px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-family: inherit;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  z-index: 100;
  transition: all 0.15s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}
.help-trigger:hover {
  background: var(--accent-f2l);
  color: #000;
  border-color: var(--accent-f2l);
  transform: scale(1.08);
}

/* ============================================================
 * Notify (general toast)
 * ============================================================ */
.notify-stack {
  position: fixed;
  top: 80px;
  right: 18px;
  z-index: 9800;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  max-width: 360px;
}
.notify-toast {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-main);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.25s, transform 0.25s;
}
.notify-toast.show { opacity: 1; transform: translateX(0); }

.notify-toast.notify-info    { border-left-color: var(--accent-f2l); }
.notify-toast.notify-success { border-left-color: var(--accent-pll); }
.notify-toast.notify-warn    { border-left-color: var(--accent-cross); }
.notify-toast.notify-error   { border-left-color: #ff4040; background: rgba(60, 16, 16, 0.6); }

.notify-icon { font-size: 16px; flex-shrink: 0; }
.notify-msg { flex: 1; line-height: 1.4; }
.notify-close {
  background: transparent;
  border: none;
  color: var(--text-sub);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 4px;
  font-family: inherit;
}
.notify-close:hover { color: #fff; }

.solver-retry {
  display: inline-block;
  margin-top: 6px;
  color: var(--accent-f2l);
  text-decoration: underline;
}

/* ============================================================
 * Settings panel trigger + content
 * ============================================================ */
.settings-trigger {
  position: fixed;
  bottom: 50px;
  left: 60px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-family: inherit;
  font-size: 16px;
  cursor: pointer;
  z-index: 100;
  transition: all 0.15s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}
.settings-trigger:hover {
  background: var(--accent-adv);
  border-color: var(--accent-adv);
  transform: scale(1.08) rotate(60deg);
}

.settings-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.settings-row-actions { gap: 8px; flex-wrap: wrap; }
.settings-input {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  min-width: 160px;
}
.settings-input:focus { outline: none; border-color: var(--accent-f2l); }

.settings-hint {
  font-size: 11px;
  color: var(--text-sub);
  margin-top: 6px;
  font-style: italic;
}

.settings-about {
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}
.settings-about b { color: var(--text-main); }
.settings-about-links {
  margin-top: 6px;
}
.settings-about-links a {
  color: var(--accent-f2l);
  text-decoration: none;
}
.settings-about-links a:hover { text-decoration: underline; }

/* ============================================================
 * Legal pages (privacy / terms / about)
 * ============================================================ */
body.legal-page {
  display: block;
  overflow-y: auto;
  height: auto;
  min-height: 100vh;
}

.legal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}
.legal-back {
  color: var(--accent-f2l);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}
.legal-back:hover { text-decoration: underline; }
.legal-brand {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-main);
}

.legal-main {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}
.legal-article {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 36px 40px;
  line-height: 1.7;
}
.legal-article h1 {
  font-size: 28px;
  color: var(--text-main);
  margin-bottom: 8px;
}
.legal-article h2 {
  font-size: 18px;
  color: var(--accent-f2l);
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.5px;
}
.legal-article p,
.legal-article ul {
  color: var(--text-main);
  font-size: 14px;
  margin-bottom: 14px;
}
.legal-article ul {
  padding-left: 20px;
}
.legal-article li {
  margin-bottom: 6px;
}
.legal-article code {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 12px;
  color: var(--accent-pll);
}
.legal-article a {
  color: var(--accent-f2l);
  text-decoration: none;
}
.legal-article a:hover { text-decoration: underline; }
.legal-article b { color: var(--text-main); font-weight: 700; }
.legal-meta {
  color: var(--text-sub);
  font-size: 12px;
  margin-bottom: 24px !important;
  letter-spacing: 0.5px;
}

.about-hero {
  font-size: 16px;
  color: var(--text-main);
  background: var(--bg-card);
  padding: 18px 22px;
  border-radius: 10px;
  border-left: 4px solid var(--accent-f2l);
  margin-bottom: 24px;
}
.about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  list-style: none !important;
  padding: 0 !important;
}
.about-stats li {
  background: var(--bg-card);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 13px;
}
.about-stats b {
  display: inline-block;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  color: var(--accent-pll);
  font-size: 18px;
  margin-right: 4px;
}

/* Footer links（在三個 legal 頁面 + 主 app 都用） */
.brand-footer-links a {
  color: var(--text-sub);
  text-decoration: none;
  margin: 0 4px;
}
.brand-footer-links a:hover {
  color: var(--accent-f2l);
  text-decoration: underline;
}

@media (max-width: 640px) {
  .legal-main { padding: 20px 12px; }
  .legal-article { padding: 22px 18px; }
}

/* ============================================================
 * Light theme overrides（透過 [data-theme="light"] 啟用）
 * ============================================================ */
html[data-theme="light"] {
  --bg-main:        #f5f6f9;
  --bg-panel:       #ffffff;
  --bg-card:        #f0f2f6;
  --bg-card-hover:  #e6e9ef;
  --text-main:      #1a1d24;
  --text-sub:       #6b7080;
  --border:         #d8dade;
  /* accent colours 維持不變，保留品牌一致性 */
}

html[data-theme="light"] body { background: var(--bg-main); }

/* 淺色下，部分原 dark-only 元素需個別調整 */
html[data-theme="light"] .timer-display.inspection.warn { color: #c75d12; }
html[data-theme="light"] .timer-display.inspection.danger { color: #c81717; }

/* 3D 場景背景在淺色時也跟著變（由 CubeScene.js 讀取，渲染端不變這邊負責 CSS 區） */
html[data-theme="light"] .cube-canvas { background: var(--bg-main); }

/* 淺色下卡片陰影更明顯 */
html[data-theme="light"] .ach-badge.unlocked:hover { box-shadow: 0 4px 14px rgba(255, 215, 0, 0.35); }
html[data-theme="light"] .achievement-toast { box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15); }
html[data-theme="light"] .notify-toast { box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1); }

/* welcome banner backdrop 在淺色變淡 */
html[data-theme="light"] .welcome-banner { background: rgba(255, 255, 255, 0.78); }
html[data-theme="light"] .help-backdrop  { background: rgba(255, 255, 255, 0.65); }

/* Theme toggle in settings */
.theme-toggle {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
}
.theme-btn {
  background: transparent;
  border: none;
  color: var(--text-sub);
  padding: 6px 14px;
  font-size: 13px;
  font-family: inherit;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  gap: 6px;
}
.theme-btn:hover { color: var(--text-main); }
.theme-btn.active[data-theme="dark"]  { background: var(--bg-card-hover); color: var(--text-main); }
.theme-btn.active[data-theme="light"] { background: var(--accent-cross); color: #000; }

/* ============================================================
 * AdSense 廣告位
 *   - 預埋位於 body 底部，AdSense 通過後填入 ins.adsbygoogle 即可上線
 *   - UX-critical views 自動隱藏（Timer 計時中、Trainer 辨識模式）
 * ============================================================ */
.ad-slot {
  width: 100%;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 0;
  /* 預設空容器不佔空間；填入 ins 後 min-height 由 ins 自身定義 */
}
.ad-slot:empty { display: none; }
.ad-slot ins.adsbygoogle { width: 100%; max-width: 970px; }

/* Timer / Trainer Recognition 模式不顯示廣告（保護沉浸體驗） */
body[data-view="timer"] .ad-slot,
body[data-view="trainer"] .ad-slot {
  display: none !important;
}

/* AdSense Auto Ads 也透過此規則隱藏（AdSense 注入的 ins 都加 .adsbygoogle 類） */
body[data-view="timer"] ins.adsbygoogle,
body[data-view="trainer"] ins.adsbygoogle {
  display: none !important;
}