/* Milestone 14: Puzzle Library overlay becomes the single puzzle-start hub. */
body.library-open {
  overflow: hidden;
}

.puzzle-library-overlay[hidden] {
  display: none;
}

.puzzle-library-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(248, 250, 252, 0.98), rgba(239, 246, 255, 0.98));
  overflow: hidden;
  padding: max(16px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
}

.library-shell {
  width: min(1180px, 100%);
  height: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 14px;
}

.library-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.library-header h2 {
  margin: 2px 0 6px;
  font-size: clamp(1.45rem, 4vw, 2.15rem);
  letter-spacing: -0.04em;
}

.library-layout {
  min-height: 0;
  overflow: auto;
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(360px, 1.22fr);
  gap: 14px;
  align-items: start;
  padding-bottom: 4px;
}

.library-card {
  box-shadow: var(--shadow-soft);
}

.library-start-card {
  grid-column: 1 / -1;
}

.curated-library-card {
  grid-column: 1 / -1;
}

.library-action-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}

.library-choice-card,
.library-puzzle-card {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  min-width: 0;
  display: grid;
  gap: 7px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  color: var(--ink);
  padding: 14px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.library-choice-card:hover,
.library-puzzle-card:hover,
.library-choice-card:focus-visible,
.library-puzzle-card:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(59, 130, 246, 0.6);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.1);
  outline: none;
}

.library-choice-card strong,
.library-puzzle-card strong {
  color: var(--brand-deep);
  font-weight: 900;
}

.library-choice-card span,
.library-puzzle-summary,
.library-puzzle-meta {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.35;
}

.library-choice-card.featured-choice {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(16, 185, 129, 0.08));
  border-color: rgba(37, 99, 235, 0.24);
}

.library-choice-card.is-loading {
  border-color: rgba(37, 99, 235, 0.5);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(245, 158, 11, 0.1));
  cursor: wait;
}

.library-choice-card.is-loading strong::after {
  content: '';
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  margin-left: 8px;
  border: 2px solid rgba(37, 99, 235, 0.3);
  border-top-color: var(--brand);
  border-radius: 999px;
  vertical-align: -0.12em;
  animation: library-card-spin 0.8s linear infinite;
}

@keyframes library-card-spin {
  to { transform: rotate(360deg); }
}

.library-filter-bar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) repeat(2, minmax(168px, auto));
  gap: 10px;
  margin-bottom: 16px;
  align-items: start;
}

.library-search-input,
.library-filter-select,
.library-filter-menu > summary,
.library-filter-panel {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 10px 12px;
}

.library-filter-menu {
  position: relative;
  min-width: 0;
}

#libraryTagMenu .library-filter-panel {
  left: auto;
  right: 0;
}

.library-filter-menu > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  min-height: 44px;
}

.library-filter-menu > summary::-webkit-details-marker {
  display: none;
}

.library-filter-menu > summary::after {
  content: '';
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translateY(-2px);
  transition: transform 0.16s ease;
}

.library-filter-menu[open] > summary::after {
  transform: rotate(225deg) translateY(-1px);
}

.library-filter-summary {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  white-space: nowrap;
}

.library-filter-panel {
  position: absolute;
  z-index: 4;
  top: calc(100% + 8px);
  left: 0;
  display: grid;
  gap: 8px;
  min-width: min(320px, calc(100vw - 40px));
  max-width: min(420px, calc(100vw - 40px));
  max-height: min(420px, 58vh);
  box-sizing: border-box;
  overflow: auto;
  margin: 0;
  padding: 12px;
  box-shadow: 0 20px 44px rgba(15, 23, 42, 0.14);
}

.library-filter-panel legend {
  padding: 0;
}

.library-checkbox-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: flex-start;
  min-width: 0;
}

.library-checkbox-list label {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  max-width: 100%;
  border: 1px solid rgba(122, 92, 58, 0.16);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.2;
  padding: 6px 9px;
  user-select: none;
}

.library-checkbox-list input {
  flex: 0 0 auto;
  accent-color: var(--brand);
}

.library-filter-empty {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.manual-logic-detail .manual-candidate-line {
  margin-bottom: 0;
}

.manual-candidate-line span {
  color: var(--muted);
  font-weight: 850;
}

.library-search-input::placeholder {
  color: var(--muted);
  font-weight: 700;
}

.library-search-input:focus,
.library-filter-select:focus,
.library-filter-menu > summary:focus,
.library-filter-menu:focus-within > summary,
.library-filter-panel:focus-within {
  border-color: rgba(37, 99, 235, 0.55);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
  outline: none;
}

.library-puzzle-groups {
  display: grid;
  gap: 16px;
}

.library-difficulty-group {
  display: grid;
  gap: 10px;
}

.library-difficulty-group h3 {
  margin: 0;
  color: var(--brand-deep);
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.library-puzzle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.library-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}

.library-tag-list span {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-width: 0;
  border: 1px solid rgba(59, 130, 246, 0.18);
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.08);
  color: var(--brand-deep);
  font-size: 0.74rem;
  font-weight: 800;
  line-height: 1.2;
  overflow-wrap: anywhere;
  padding: 4px 8px;
}



.school-preview-landing {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(210px, 0.42fr);
  gap: 16px;
  align-items: stretch;
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: 22px;
  padding: clamp(16px, 3vw, 24px);
  background: radial-gradient(circle at 12% 15%, rgba(37, 99, 235, 0.15), transparent 36%), radial-gradient(circle at 88% 10%, rgba(16, 185, 129, 0.13), transparent 35%), #fff;
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.1);
}

.school-preview-landing-copy h3 {
  margin: 12px 0 10px;
  color: var(--ink);
  font-size: clamp(1.55rem, 3vw, 2.45rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
}

.school-preview-landing-copy p {
  max-width: 68ch;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.55;
}

.school-preview-award-card {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 8px;
  border: 1px solid rgba(76, 45, 127, 0.18);
  border-radius: 22px;
  padding: 18px;
  background: linear-gradient(135deg, rgba(250, 245, 255, 0.96), rgba(239, 247, 225, 0.78));
  text-align: center;
}

.school-preview-award-icon {
  width: 4.6rem;
  height: 4.6rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #4c2d7f;
  background: radial-gradient(circle at 35% 25%, rgba(255, 255, 255, 0.96), rgba(224, 214, 255, 0.96) 38%, rgba(76, 45, 127, 0.28));
  border: 1px solid rgba(76, 45, 127, 0.3);
  box-shadow: 0 18px 32px rgba(76, 45, 127, 0.16);
}

.school-preview-award-icon svg {
  width: 2.4rem;
  height: 2.4rem;
  fill: currentColor;
}

.school-preview-award-card strong {
  color: var(--ink);
  font-size: 1.1rem;
  font-weight: 950;
}

.school-preview-award-card span:last-child {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.42;
}

.school-preview-benefit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.school-preview-benefit-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 12px;
  align-items: start;
  border: 1px solid rgba(37, 99, 235, 0.13);
  border-radius: 20px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.88);
}

.school-preview-benefit-card > span {
  grid-row: 1 / span 2;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 950;
}

.school-preview-benefit-card strong {
  color: var(--ink);
  font-weight: 950;
  line-height: 1.2;
}

.school-preview-benefit-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.school-preview-benefit-card.is-wide {
  grid-column: 1 / -1;
}

@media (max-width: 720px) {
  .school-preview-landing,
  .school-preview-benefit-grid {
    grid-template-columns: 1fr;
  }
}

.school-coach-card {
  display: grid;
  gap: 12px;
  border-color: rgba(37, 99, 235, 0.2);
  background: radial-gradient(circle at 0 0, rgba(37, 99, 235, 0.12), transparent 34%), radial-gradient(circle at 100% 15%, rgba(16, 185, 129, 0.11), transparent 32%), var(--surface);
}

.school-coach-card[hidden] {
  display: none;
}

.school-coach-body {
  display: grid;
  gap: 12px;
}

.school-coach-objective {
  margin: 0;
  color: var(--muted);
  line-height: 1.48;
}

.school-coach-progress {
  border: 1px solid rgba(37, 99, 235, 0.13);
  border-radius: 16px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.78);
}

.school-coach-progress-bar {
  position: relative;
  display: block;
  height: 30px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.08);
}

.school-coach-progress-segment {
  position: absolute;
  top: 0;
  bottom: 0;
  display: block;
  transition: left 180ms ease, width 180ms ease;
}

.school-coach-progress-givens {
  left: 0;
  width: 0%;
  background: rgba(37, 99, 235, 0.34);
}

.school-coach-progress-added {
  left: 0%;
  width: 0%;
  background: rgba(16, 185, 129, 0.58);
}

.school-coach-progress-seam-label,
.school-coach-progress-total {
  position: absolute;
  top: 50%;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  min-height: 20px;
  border-radius: 999px;
  padding: 0 7px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 1px 5px rgba(15, 23, 42, 0.08);
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 850;
  line-height: 1;
  white-space: nowrap;
}

.school-coach-progress-seam-label {
  left: 0%;
  transform: translate(-50%, -50%);
}

.school-coach-progress-total {
  right: 8px;
  transform: translateY(-50%);
}

.school-coach-prompt {
  display: grid;
  gap: 4px;
  border: 1px solid rgba(16, 185, 129, 0.18);
  border-radius: 16px;
  padding: 12px;
  background: rgba(239, 247, 225, 0.66);
  color: var(--muted);
  line-height: 1.45;
}

.school-coach-prompt strong {
  color: var(--brand-deep);
  font-size: 0.95rem;
}

.school-coach-prompt span {
  display: block;
}

.school-coach-reveal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 4px;
}

.school-coach-reveal-count {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.school-overlay[hidden] {
  display: none;
}

.school-overlay {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.school-shell {
  width: min(1180px, 100%);
  height: auto;
  min-height: 100%;
  grid-template-rows: auto auto;
  overflow: visible;
}

.school-scroll-area {
  min-height: 0;
  overflow: visible;
  display: grid;
  gap: 14px;
  align-content: start;
  padding-bottom: 4px;
}

.school-overview-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.75fr) minmax(320px, 1.25fr);
  gap: 14px;
  align-items: stretch;
  min-height: 0;
}

.school-card {
  box-shadow: var(--shadow-soft);
}

.school-next-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(16, 185, 129, 0.08));
}

.school-next-card h3 {
  margin: 3px 0 6px;
  color: var(--brand-deep);
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}

.school-next-card p {
  margin: 0 0 8px;
  color: var(--muted);
  line-height: 1.42;
}

.school-track-browser {
  min-height: 0;
  overflow: visible;
}

.school-track-grid {
  display: grid;
  gap: 14px;
}

.school-track-card {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface-soft);
  padding: 14px;
}

.school-track-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.school-track-heading h3 {
  margin: 2px 0 0;
  color: var(--ink);
  font-size: 1.05rem;
  letter-spacing: -0.025em;
}

.school-lesson-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 10px;
}

.school-lesson-card {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  padding: 12px;
}

.school-lesson-card.is-complete {
  border-color: rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.07);
}

.school-lesson-card.is-current {
  border-color: rgba(37, 99, 235, 0.38);
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(16, 185, 129, 0.07));
}

.school-lesson-card.is-locked {
  opacity: 0.66;
  background: rgba(248, 250, 252, 0.85);
}

.school-lesson-card.is-locked strong,
.school-lesson-card.is-locked p,
.school-lesson-card.is-locked .library-puzzle-meta {
  color: var(--muted);
}

.school-lesson-card > div {
  min-width: 0;
}

.school-lesson-number {
  display: inline-flex;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.school-lesson-card strong {
  display: block;
  color: var(--brand-deep);
  font-weight: 950;
  line-height: 1.2;
}

.school-lesson-card p {
  margin: 6px 0 8px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.38;
}

.school-lesson-card .button {
  flex: 0 0 auto;
}

@media (max-width: 900px) {
  .school-overview-grid {
    grid-template-columns: 1fr;
  }

  .school-next-card,
  .school-lesson-card {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 900px) {
  .library-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .library-header {
    flex-direction: column;
    align-items: stretch;
  }

  .library-header .button {
    width: 100%;
  }

  .library-filter-bar {
    grid-template-columns: 1fr;
  }

  .library-filter-panel,
  #libraryTagMenu .library-filter-panel {
    position: static;
    left: auto;
    right: auto;
    max-width: 100%;
    max-height: 42vh;
    margin-top: 8px;
  }

  .library-action-grid,
  .library-puzzle-grid {
    grid-template-columns: 1fr;
  }
}