/* ==========================================================================
   CFOP LEARN ACADEMY — Full-Screen Studio
   ========================================================================== */

.learn-panel-container {
  position: fixed;
  top: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  display: none;
}

.learn-panel-container.learn-open {
  display: block;
}

.learn-mode #main {
  opacity: 0;
  pointer-events: none;
}

.learn-panel {
  display: grid;
  grid-template-columns: 248px 1fr;
  height: 100%;
  background: #000000;
  overflow: hidden;
}

.learn-sidebar {
  display: flex;
  flex-direction: column;
  background: rgba(7, 8, 12, 0.94);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  overflow-y: auto;
}

.learn-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px 10px;
}

.learn-header-badge {
  display: block;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-tertiary);
}

.learn-sidebar-header h2 {
  font-size: 1.08rem;
  font-weight: 700;
  color: #F5F5F7;
}

.learn-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.18s var(--ease-apple), background 0.18s var(--ease-apple), color 0.18s var(--ease-apple), border-color 0.18s var(--ease-apple);
}

.learn-close-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.28);
  transform: scale(1.06);
}

.learn-close-btn:active {
  transform: scale(0.92);
}

.learn-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 10px 20px;
}

.learn-nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  cursor: pointer;
  text-align: left;
  transition: background 0.16s var(--ease-apple), color 0.16s var(--ease-apple), border-color 0.16s var(--ease-apple);
}

.learn-nav-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #F5F5F7;
}

.learn-nav-item.active {
  background: rgba(var(--accent-rgb), 0.16) !important;
  color: #FFFFFF;
  border-color: rgba(var(--accent-rgb), 0.42) !important;
}

.learn-nav-item.active .learn-nav-icon {
  color: var(--accent-light);
}

.learn-nav-icon {
  font-size: 1.0rem;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.learn-nav-label {
  font-size: 0.84rem;
  font-weight: 600;
  display: block;
}

.learn-nav-desc {
  font-size: 0.68rem;
  color: var(--text-tertiary);
  display: block;
}

.learn-content {
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px 28px 60px;
  -webkit-overflow-scrolling: touch;
}

.learn-overview,
.learn-section-content {
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

.overview-hero,
.section-hero {
  text-align: center;
  margin-bottom: 16px;
  padding: 18px 20px 16px;
  background: var(--glass-capsule-fill);
  border-radius: var(--r-xl);
  box-shadow: var(--liquid-shadow-md);
  position: relative;
}

.section-hero.compact-hero {
  padding: 14px 18px 12px;
  margin-bottom: 14px;
}

.overview-hero::before,
.section-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--r-xl);
  padding: 1px;
  background: var(--liquid-rim-refraction);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.hero-eyebrow {
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  color: var(--text-tertiary);
  margin-bottom: 4px;
}

.overview-hero h2,
.section-hero h2 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 5px;
}

.overview-intro,
.section-hero p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.45;
}

.overview-intro {
  margin-bottom: 12px;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 7px;
  flex-wrap: wrap;
}

.hero-badge {
  font-size: 0.7rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.11);
  padding: 4px 11px;
  border-radius: var(--r-pill);
}

.learn-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.learn-search-bar {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  min-width: 0;
}

.learn-search-input {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  outline: none;
}

.learn-filter-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.learn-fav-filter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 13px;
  border-radius: var(--r-pill);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.learn-fav-filter.active {
  background: rgba(255, 214, 10, 0.14);
  border-color: rgba(255, 214, 10, 0.40);
  color: var(--yellow);
}

.trainer-mode-btn {
  height: 36px;
  padding: 0 13px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(var(--accent-rgb), 0.36);
  background: rgba(var(--accent-rgb), 0.14);
  color: var(--accent-light);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

.cfop-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}

.cfop-step-card {
  padding: 16px 14px;
  background: var(--glass-card-fill);
  border-radius: var(--r-lg);
  box-shadow: var(--liquid-shadow-sm);
  text-align: center;
  cursor: pointer;
  position: relative;
}

.cfop-step-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  padding: 1px;
  background: var(--liquid-rim-soft);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.step-number {
  font-size: 1.6rem;
  font-weight: 800;
  color: #F5F5F7;
  margin-bottom: 4px;
}

.cfop-step-card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 5px;
}

.cfop-step-card p {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.4;
  margin-bottom: 10px;
}

.step-badge {
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
  padding: 3px 9px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.time-targets,
.notation-ref,
.alg-group,
.tips-group {
  margin-bottom: 22px;
}

.time-targets h3,
.notation-ref h3,
.tips-group-title,
.alg-group-title {
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.targets-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 9px;
}

.target-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 10px;
  background: var(--glass-card-fill);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  text-align: center;
  cursor: pointer;
}

/* The stage you're at: the theme's accent, like every other "current" highlight */
.active-target {
  border-color: rgba(var(--accent-light-rgb), 0.38);
  background: rgba(var(--accent-rgb), 0.08);
}

.target-level {
  font-size: 0.64rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}

.target-time {
  font-family: var(--font-mono);
  font-size: 1.18rem;
  font-weight: 700;
}

.active-target .target-time {
  color: var(--accent-light);
}

.target-desc {
  font-size: 0.68rem;
  color: var(--text-tertiary);
}

.notation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(135px, 1fr));
  gap: 8px;
}

.notation-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}

/* "R / R'" stays on one line; the description wraps instead */
.notation-item code {
  flex-shrink: 0;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: #F5F5F7;
}

.notation-item span {
  font-size: 0.72rem;
  color: var(--text-tertiary);
}

.tips-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tip-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.tip-bullet {
  color: #FFFFFF;
  font-weight: 700;
}

.exercise-item .tip-bullet {
  color: var(--accent-light);
}

/* Algorithm Cards Grid (Untruncated Full-Width Notation!) */
.alg-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 10px;
  width: 100%;
}

.alg-card {
  background: var(--glass-card-fill);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  box-shadow: var(--liquid-shadow-sm);
  padding: 12px 14px;
  position: relative;
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  transition: transform 0.20s var(--ease-apple), border-color 0.20s var(--ease-apple), box-shadow 0.20s var(--ease-apple);
}

.alg-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: var(--liquid-shadow-md);
}

.alg-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 9px;
  min-width: 0;
}

.alg-card-visual {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
}

.visual-play-hint {
  position: absolute;
  bottom: -2px;
  right: -2px;
  font-size: 0.54rem;
  font-weight: 800;
  padding: 1px 5px;
  border-radius: var(--r-pill);
  background: rgba(var(--accent-rgb), 0.85);
  color: #FFFFFF;
  opacity: 0;
  transition: opacity 0.16s var(--ease-apple);
}

.alg-card:hover .visual-play-hint {
  opacity: 1;
}

.ll-diagram-svg {
  display: block;
  width: 58px;
  height: 58px;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.5));
}

.f2l-diagram-svg {
  display: block;
  width: 62px;
  height: 52px;
  filter: drop-shadow(0 6px 14px rgba(0, 0, 0, 0.65));
}

.alg-card-meta {
  flex: 1;
  min-width: 0;
}

.alg-card-title-row {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 2px;
  flex-wrap: wrap;
}

.alg-card-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: #F5F5F7;
}

.alg-prob-pill {
  font-size: 0.62rem;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.09);
  padding: 1px 7px;
  border-radius: var(--r-pill);
}

.alg-stat-pill {
  font-size: 0.62rem;
  font-family: var(--font-mono);
  color: var(--green);
  background: rgba(48, 209, 88, 0.10);
  border: 1px solid rgba(48, 209, 88, 0.24);
  padding: 1px 7px;
  border-radius: var(--r-pill);
}

.alg-card-desc {
  display: block;
  font-size: 0.74rem;
  color: var(--text-secondary);
  line-height: 1.35;
}

.alg-fav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: none;
  background: none;
  color: var(--text-tertiary);
  cursor: pointer;
  border-radius: 50%;
  flex-shrink: 0;
}

.alg-fav-btn.fav-active {
  color: var(--yellow);
}

.alg-notation {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  width: 100%;
}

.alg-code {
  flex: 1;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: #F5F5F7;
  background: rgba(255, 255, 255, 0.05);
  padding: 7px 10px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border);
  line-height: 1.35;
  word-break: break-word;
}

.alg-action-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 10px;
  border-radius: var(--r-xs);
  border: 1px solid rgba(var(--accent-rgb), 0.36);
  background: rgba(var(--accent-rgb), 0.14);
  color: var(--accent-light);
  font-family: var(--font-sans);
  font-size: 0.73rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
}

.alg-copy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: var(--r-xs);
  cursor: pointer;
  flex-shrink: 0;
}

.alg-copy-btn.copied {
  color: var(--green);
  border-color: var(--green);
}

.alg-mirror {
  font-size: 0.71rem;
  color: var(--text-tertiary);
  margin-top: 5px;
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

.alg-mirror code {
  font-family: var(--font-mono);
}

.alg-swap-alt-btn {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: var(--accent-light);
  font-size: 0.64rem;
  font-weight: 600;
  padding: 1px 7px;
  border-radius: var(--r-pill);
  cursor: pointer;
}

.finger-tricks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 8px;
}

.finger-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}

.finger-move {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: #F5F5F7;
  min-width: 36px;
  text-align: center;
  background: rgba(255, 255, 255, 0.07);
  padding: 5px 8px;
  border-radius: var(--r-xs);
}

.finger-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Interactive 3D Step Player Modal */
.alg-player-card {
  max-width: 480px;
}

.player-modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #F5F5F7;
}

.alg-player-stage-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-lg);
  padding: 10px;
  position: relative;
}

.alg-player-3d-stage {
  cursor: grab;
  touch-action: none;
}

.alg-player-step-badge {
  font-family: var(--font-mono);
  font-size: 0.70rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.alg-player-moves-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  padding: 10px 12px;
  background: rgba(0, 0, 0, 0.45);
  border-radius: var(--r-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  max-height: 96px;
  overflow-y: auto;
}

.player-move-token {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  color: var(--text-secondary);
  cursor: pointer;
}

.player-move-token.done-move {
  color: rgba(48, 209, 88, 0.85);
  border-color: rgba(48, 209, 88, 0.25);
}

.player-move-token.active-move {
  background: var(--accent);
  border-color: var(--accent-light);
  color: #FFFFFF;
  transform: scale(1.08);
}

.alg-player-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
}


/* ── 3D Step Player Sizing & Trigger Badges ── */
.alg-player-3d-stage svg {
  width: 196px !important;
  height: 162px !important;
  display: block;
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.85));
}

.alg-player-controls .btn-pill,
.alg-player-controls .btn {
  white-space: nowrap;
  height: 34px;
  padding: 0 14px;
  font-size: 0.78rem;
}

/* Every player control reads as a button, not as loose text */
.alg-player-controls .btn-pill:not(.active) {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.alg-player-controls .btn-pill.active {
  background: var(--accent);
  color: #fff;
}

.player-triggers-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
}