:root {
  color-scheme: light;
  --ink: #14213d;
  --muted: #667085;
  --line: #d7dde5;
  --paper: #f6f7f9;
  --panel: #ffffff;
  --card: #ffffff;
  --teal: #0f766e;
  --rust: #9a3412;
  --gold: #b7791f;
  --blue: #1d4ed8;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  padding-bottom: 86px;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px clamp(16px, 4vw, 42px);
  border-bottom: 1px solid rgba(20, 33, 61, 0.12);
  background: rgba(246, 247, 249, 0.88);
  backdrop-filter: blur(16px);
}

.header-left {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.hamburger-button {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #ffffff;
  color: var(--ink);
  box-shadow: 0 10px 24px rgba(20, 33, 61, 0.08);
}

.hamburger-button span {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 35;
  background: rgba(20, 33, 61, 0.34);
}

.main-menu {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 40;
  width: min(390px, calc(100vw - 28px));
  overflow-y: auto;
  border-right: 1px solid var(--line);
  padding: 18px;
  background: var(--panel);
  box-shadow: 18px 0 44px rgba(20, 33, 61, 0.18);
  transform: translateX(-105%);
  transition: transform 0.2s ease;
}

body.menu-open .main-menu {
  transform: translateX(0);
}

.main-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.main-menu-header h2 {
  margin: 0;
}

.menu-groups {
  display: grid;
  gap: 14px;
}

.menu-groups section {
  display: grid;
  gap: 7px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: var(--card);
}

.menu-groups h3 {
  margin: 0 0 4px;
  color: var(--rust);
  font-size: 0.82rem;
  text-transform: uppercase;
}

.menu-groups button {
  min-height: 38px;
  border: 0;
  border-radius: 8px;
  padding: 8px 10px;
  background: transparent;
  color: var(--ink);
  font-weight: 780;
  text-align: left;
}

.menu-groups button:hover,
.menu-groups button:focus {
  background: #ecfdf5;
  color: var(--teal);
  outline: none;
}

.brand-block {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand-mark {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  color: white;
  background: linear-gradient(135deg, var(--teal), var(--rust));
  border-radius: 8px;
  font-size: 1.55rem;
  font-weight: 800;
}

.brand-block h1,
.brand-block p {
  margin: 0;
}

.brand-block h1 {
  font-size: clamp(1.25rem, 5vw, 1.7rem);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--rust);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.install-button,
.stage-toolbar button,
.formula-box button,
.mini-button,
.icon-button {
  min-height: 42px;
  border: 0;
  border-radius: 8px;
  padding: 0 14px;
  color: white;
  background: var(--teal);
  font-weight: 750;
}

.hero {
  position: relative;
  height: 78vh;
  min-height: 620px;
  max-height: 720px;
  display: grid;
  align-items: end;
  overflow: hidden;
  isolation: isolate;
  color: white;
}

#heroCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
}

.hero::after {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background: linear-gradient(90deg, rgba(5, 12, 20, 0.82), rgba(5, 12, 20, 0.28));
}

.hero-content {
  width: min(820px, 100%);
  padding: 84px clamp(18px, 6vw, 64px) 54px;
}

.hero h2 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.25rem, 9vw, 5.7rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero p:not(.eyebrow) {
  max-width: 620px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1rem, 3.2vw, 1.22rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-actions a,
.hero-actions button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 8px;
  padding: 0 16px;
  background: rgba(255, 255, 255, 0.14);
  color: white;
  text-decoration: none;
  font-weight: 760;
}

.app-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 15;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
  padding: 8px max(8px, env(safe-area-inset-left)) max(8px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-right));
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(16px);
}

.app-nav button {
  min-width: 0;
  min-height: 56px;
  display: grid;
  place-items: center;
  gap: 2px;
  border: 0;
  border-radius: 8px;
  padding: 6px 2px;
  color: var(--muted);
  background: transparent;
  font-size: clamp(0.55rem, 2.2vw, 0.78rem);
  font-weight: 820;
  line-height: 1.05;
}

.app-nav button.active {
  color: white;
  background: var(--teal);
}

.app-nav span {
  font-size: 1rem;
  line-height: 1;
}

.screen-section {
  display: none !important;
}

body:not(.app-ready) .screen-section[data-screen="home"],
.screen-section.screen-active {
  display: block !important;
}

.hero.screen-active,
body:not(.app-ready) .hero[data-screen="home"] {
  display: grid !important;
}

.split.screen-active {
  display: grid !important;
}

.section {
  padding: 54px clamp(16px, 4vw, 42px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 22px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 6vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.daily-grid,
.visual-grid,
.module-grid,
.domain-grid,
.object-grid,
.learning-grid,
.person-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

.daily-card,
.result-card,
.visual-stage,
.module-grid article,
.search-panel,
.domain-card,
.object-card,
.practice-panel,
.problem-card,
.reference-panel,
.library-panel,
.mode-panel,
.map-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.media-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.media-showcase-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.media-showcase-controls button {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-weight: 820;
}

.home-media-card {
  overflow: hidden;
  display: grid;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.home-media-card:hover,
.home-media-card:focus,
.media-card:hover,
.media-card:focus {
  border-color: rgba(15, 118, 110, 0.45);
  box-shadow: 0 16px 42px rgba(20, 33, 61, 0.12);
  outline: none;
  transform: translateY(-1px);
}

.home-media-card .media-visual {
  aspect-ratio: 16 / 10;
}

.home-media-card > div:not(.media-visual) {
  display: grid;
  gap: 6px;
  padding: 12px;
}

.home-media-card .home-media-meta {
  color: var(--rust);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.home-media-card h3,
.home-media-card p {
  margin: 0;
}

.home-media-card h3 {
  font-size: 1rem;
}

.home-media-card p {
  color: var(--muted);
  font-size: 0.9rem;
}

.home-media-card small {
  color: var(--blue);
  font-weight: 800;
}

.section-action {
  min-height: 44px;
  width: fit-content;
  margin-top: 16px;
  border: 0;
  border-radius: 8px;
  padding: 0 16px;
  background: var(--teal);
  color: white;
  font: inherit;
  font-weight: 850;
}

.person-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 430px), 1fr));
}

.person-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.portrait {
  display: grid;
  width: 76px;
  height: 92px;
  place-items: center;
  border-radius: 8px;
  color: white;
  background:
    radial-gradient(circle at 52% 36%, rgba(255,255,255,.24), transparent 28%),
    linear-gradient(135deg, var(--teal), var(--rust));
  font-size: 2rem;
  font-weight: 900;
}

.person-card span {
  color: var(--blue);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.person-card h3 {
  margin: 6px 0 8px;
}

.person-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.person-card dl {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 12px;
  margin: 0;
}

.person-card dt {
  color: var(--rust);
  font-weight: 850;
}

.person-card dd {
  margin: 0;
  color: var(--muted);
}

.person-card .mini-button {
  grid-column: 1 / -1;
}

.formula-render {
  margin: 8px 0;
  color: var(--ink);
  font-size: 1.12rem;
}

.daily-card {
  min-height: 184px;
  padding: 18px;
}

.daily-card span,
.result-card span {
  color: var(--blue);
  font-size: 0.77rem;
  font-weight: 850;
  text-transform: uppercase;
}

.daily-card h3,
.result-card h3 {
  margin: 10px 0 8px;
  font-size: 1.16rem;
}

.daily-card p,
.result-card p,
.domain-card p,
.object-card p,
.problem-card p,
.muted {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 22px;
  align-items: start;
}

.search-panel {
  padding: 16px;
}

.search-panel label,
.formula-box label {
  display: block;
  margin-bottom: 8px;
  font-weight: 800;
}

.search-panel input,
.formula-box input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  background: white;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.chips button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 11px;
  background: white;
  color: var(--ink);
  font-weight: 700;
}

.chips .active {
  color: white;
  border-color: var(--teal);
  background: var(--teal);
}

.result-list {
  display: grid;
  gap: 12px;
}

.result-card {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.favorites-tools {
  display: grid;
  grid-template-columns: minmax(180px, 260px) auto 1fr;
  gap: 12px;
  align-items: end;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.favorites-tools label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-weight: 800;
}

.favorites-tools select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
}

.mini-button {
  width: fit-content;
  min-height: 38px;
  font-size: 0.9rem;
}

.mini-button.active,
.favorite-button.active {
  background: var(--rust);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.search-score {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  background: #ffffff;
  color: var(--blue);
  font-size: 0.84rem;
  font-weight: 820;
}

.advanced-filters {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.advanced-filters label {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.advanced-filters select {
  width: 100%;
  min-height: 42px;
  margin-top: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: white;
  color: var(--ink);
}

.detail-panel {
  position: sticky;
  top: 124px;
  z-index: 12;
  width: min(980px, calc(100% - 32px));
  max-height: calc(100vh - 146px);
  overflow: auto;
  margin: 18px auto 0;
  border: 1px solid rgba(20, 33, 61, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 26px 80px rgba(20, 33, 61, 0.18);
}

.detail-panel[hidden] {
  display: none;
}

.detail-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  background: white;
}

.detail-header h2 {
  margin: 0;
  font-size: clamp(1.45rem, 4vw, 2.2rem);
}

.icon-button {
  display: grid;
  min-width: 42px;
  place-items: center;
  padding: 0;
  background: var(--ink);
  font-size: 1.45rem;
}

.detail-body {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.detail-body section {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fbfcfe;
}

.detail-body h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.detail-body p,
.detail-body ul {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.detail-body ul {
  padding-left: 20px;
}

.detail-lead {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
}

.detail-actions {
  display: flex;
  justify-content: end;
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-controls {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.timeline-controls label {
  font-weight: 850;
}

.timeline-controls input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  font: inherit;
}

.timeline-periods,
.timeline-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.timeline-periods button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 11px;
  background: var(--card);
  color: var(--ink);
  font-weight: 780;
  cursor: pointer;
}

.timeline-periods button.active {
  border-color: var(--teal);
  background: var(--teal);
  color: white;
}

.timeline-stats span {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  background: var(--card);
  color: var(--muted);
}

.timeline-stats strong {
  color: var(--ink);
}

.timeline-track {
  display: grid;
  gap: 14px;
  border-left: 3px solid var(--teal);
  padding-left: 18px;
}

.timeline-card {
  position: relative;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 14px 0 18px;
}

.timeline-card::before {
  position: absolute;
  left: -27px;
  top: 19px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  content: "";
  background: var(--rust);
}

.timeline-marker {
  display: grid;
  align-content: start;
  gap: 4px;
}

.timeline time {
  font-weight: 850;
}

.timeline-marker span {
  color: var(--muted);
  font-size: 0.9rem;
}

.timeline p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.timeline-content {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.timeline-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.timeline-list {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--card);
}

.timeline-list h3 {
  margin: 0 0 8px;
  font-size: 0.88rem;
}

.timeline-list ul {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.35;
}

.visual-stage {
  overflow: hidden;
}

.stage-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 58px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}

.stage-toolbar input,
.stage-toolbar select {
  max-width: 190px;
}

.stage-toolbar select {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
}

.visual-stage canvas,
#plotCanvas {
  display: block;
  width: 100%;
  height: auto;
  background: white;
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 310px), 1fr));
  gap: 14px;
}

.lab-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.lab-body {
  display: grid;
  gap: 9px;
  padding: 14px;
}

.lab-body label {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.lab-body input,
.lab-body textarea,
.lab-body select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
}

.lab-body textarea {
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.lab-body output {
  display: grid;
  gap: 5px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #ffffff;
  color: var(--ink);
  line-height: 1.45;
}

.three-cols {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: end;
}

.three-cols output {
  grid-column: 1 / -1;
}

.converter-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: end;
}

.converter-row output {
  grid-column: 1 / -1;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, auto);
  align-items: center;
  justify-content: start;
  gap: 7px 10px;
  margin-top: 12px;
  color: var(--muted);
}

.stats-row strong {
  color: var(--ink);
  font-size: 1.25rem;
}

.map-filters {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.map-filters label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
}

.map-filters select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
}

.map-panel {
  overflow: hidden;
}

#worldMap {
  width: 100%;
  min-height: 260px;
  display: block;
  background: linear-gradient(180deg, #ecfeff, #f8fafc);
}

.land {
  fill: #dbeafe;
  stroke: rgba(29, 78, 216, 0.24);
  stroke-width: 2;
}

.muted-land {
  fill: #ccfbf1;
}

.map-pin circle {
  fill: var(--rust);
  stroke: white;
  stroke-width: 4;
  transition: r 0.18s ease, fill 0.18s ease;
}

.map-pin text {
  fill: var(--ink);
  font-size: 14px;
  font-weight: 850;
  paint-order: stroke;
  stroke: white;
  stroke-width: 5px;
  pointer-events: none;
}

.map-pin {
  cursor: pointer;
  outline: none;
}

.map-pin.active circle,
.map-pin:focus-visible circle {
  r: 15px;
  fill: var(--teal);
}

.map-detail {
  border-top: 1px solid var(--line);
  padding: 14px;
  background: var(--card);
}

.map-detail article {
  display: grid;
  gap: 10px;
}

.map-detail span,
.map-list-item span,
.map-list-item small {
  color: var(--muted);
  font-size: 0.86rem;
}

.map-detail h3 {
  margin: 0;
}

.map-detail p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.map-detail dl {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 8px 12px;
  margin: 0;
}

.map-detail dt {
  color: var(--muted);
  font-weight: 800;
}

.map-detail dd {
  margin: 0;
}

.map-list,
.reference-panel,
.library-panel,
.mode-panel,
.problem-list {
  display: grid;
  gap: 12px;
}

.map-list {
  max-height: 360px;
  overflow: auto;
  padding: 12px;
  border-top: 1px solid var(--line);
}

.map-list-item {
  display: grid;
  gap: 4px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--card);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.map-list-item.active {
  border-color: var(--teal);
  box-shadow: inset 4px 0 0 var(--teal);
}

.domain-card,
.object-card,
.practice-panel,
.problem-card {
  padding: 16px;
}

.domain-tools {
  display: grid;
  gap: 12px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.theorem-tools {
  display: grid;
  gap: 12px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.formula-tools {
  display: grid;
  gap: 12px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.object-tools {
  display: grid;
  gap: 12px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.exercise-tools {
  display: grid;
  gap: 12px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.quote-tools {
  display: grid;
  gap: 12px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.book-tools {
  display: grid;
  gap: 12px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.glossary-tools {
  display: grid;
  gap: 12px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.media-tools {
  display: grid;
  gap: 12px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.problem-tools {
  display: grid;
  gap: 12px;
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.domain-tools > label,
.domain-tool-row label,
.theorem-tools > label,
.theorem-tool-row label,
.formula-tools > label,
.formula-tool-row label,
.object-tools > label,
.object-tool-row label,
.exercise-tools > label,
.exercise-tool-row label,
.quote-tools > label,
.quote-tool-row label,
.book-tools > label,
.book-tool-row label,
.glossary-tools > label,
.glossary-tool-row label,
.media-tools > label,
.media-tool-row label,
.problem-tools > label,
.problem-tool-row label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-weight: 800;
}

.domain-tools input,
.domain-tool-row select,
.theorem-tools input,
.theorem-tool-row select,
.formula-tools input,
.formula-tool-row select,
.object-tools input,
.object-tool-row select,
.exercise-tools input,
.exercise-tool-row select,
.quote-tools input,
.quote-tool-row select,
.book-tools input,
.book-tool-row select,
.glossary-tools input,
.glossary-tool-row select,
.media-tools input,
.media-tool-row select,
.problem-tools input,
.problem-tool-row select {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 11px;
  background: var(--card);
  color: var(--ink);
  font: inherit;
}

.domain-tool-row {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: 12px;
  align-items: end;
}

.theorem-tool-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.formula-tool-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.object-tool-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.exercise-tool-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.quote-tool-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.book-tool-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.glossary-tool-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.media-tool-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.problem-tool-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.domain-card {
  display: grid;
  gap: 12px;
}

.domain-card-header,
.theorem-card-header,
.formula-card-header {
  display: grid;
  gap: 5px;
}

.domain-card-header span,
.theorem-card-header span,
.formula-card-header span {
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  background: var(--card);
  color: var(--rust);
  font-size: 0.82rem;
  font-weight: 850;
}

.domain-card h3,
.object-card h3,
.problem-card h3,
.practice-panel h3 {
  margin: 0 0 10px;
}

.domain-card h3 {
  margin: 0;
}

.domain-card p,
.theorem-card p,
.formula-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.theorem-card,
.formula-card {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
}

.theorem-card h3,
.formula-card h3 {
  margin: 0;
}

.domain-card dl,
.theorem-card dl,
.formula-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 12px;
  margin: 0;
}

.domain-card dt,
.theorem-card dt,
.formula-card dt {
  color: var(--rust);
  font-weight: 850;
}

.domain-card dd,
.theorem-card dd,
.formula-card dd {
  margin: 0;
  color: var(--muted);
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.segmented button,
.answer-grid button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 13px;
  background: white;
  color: var(--ink);
  font-weight: 780;
}

.segmented .active {
  border-color: var(--teal);
  color: white;
  background: var(--teal);
}

.object-card {
  overflow: hidden;
  display: grid;
  gap: 12px;
}

.object-figure {
  display: grid;
  place-items: center;
  height: 126px;
  margin: -16px -16px 14px;
  background:
    radial-gradient(circle at 35% 42%, rgba(255, 255, 255, 0.86) 0 8px, transparent 9px),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.26) 0 2px, transparent 2px 16px),
    linear-gradient(135deg, var(--teal), var(--blue));
  color: white;
  font-size: 2.6rem;
  font-weight: 950;
  letter-spacing: 0;
}

.object-twist,
.object-surface {
  background:
    conic-gradient(from 90deg, #0f766e, #f59e0b, #9a3412, #0f766e);
}

.object-mandelbrot,
.object-julia {
  background:
    radial-gradient(circle at 50% 50%, #07111f 0 10%, #0f766e 11% 18%, #f59e0b 19% 21%, #14213d 22% 100%);
}

.object-sierpinski,
.object-koch,
.object-menger {
  background:
    linear-gradient(30deg, transparent 40%, rgba(255,255,255,.72) 41% 43%, transparent 44%),
    linear-gradient(150deg, transparent 40%, rgba(255,255,255,.7) 41% 43%, transparent 44%),
    linear-gradient(135deg, #7c2d12, #1d4ed8);
}

.object-polyhedra,
.object-tiling,
.object-platonic,
.object-archimedean {
  background:
    repeating-linear-gradient(60deg, rgba(255,255,255,.24) 0 2px, transparent 2px 18px),
    linear-gradient(135deg, #1d4ed8, #0f766e);
}

.object-minimal {
  background:
    radial-gradient(circle at 50% 35%, rgba(255,255,255,.7), transparent 22%),
    linear-gradient(135deg, #0f766e, #14213d);
}

.object-card-header {
  display: grid;
  gap: 6px;
}

.object-card-header span,
.badge {
  display: inline-flex;
  width: fit-content;
  border-radius: 999px;
  padding: 6px 9px;
  color: white;
  background: var(--blue);
  font-size: 0.78rem;
  font-weight: 850;
}

.object-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 12px;
  margin: 0;
}

.object-card dt {
  color: var(--rust);
  font-weight: 850;
}

.object-card dd {
  margin: 0;
  color: var(--muted);
}

.practice-panel {
  min-height: 265px;
}

.learning-grid .practice-panel:first-child {
  grid-column: span 2;
}

.practice-panel .stage-toolbar {
  margin: -16px -16px 16px;
}

.exercise-layout {
  display: grid;
  grid-template-columns: minmax(210px, 0.86fr) minmax(0, 1.14fr);
  gap: 14px;
}

.exercise-list {
  display: grid;
  align-content: start;
  gap: 8px;
  max-height: 620px;
  overflow: auto;
  padding-right: 4px;
}

.exercise-list button {
  display: grid;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--card);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.exercise-list button.active {
  border-color: var(--teal);
  box-shadow: inset 4px 0 0 var(--teal);
}

.exercise-list span,
.exercise-list small {
  color: var(--muted);
  font-size: 0.84rem;
}

.exercise-detail {
  display: grid;
  align-content: start;
  gap: 12px;
}

.exercise-detail h3 {
  margin: 0;
}

.exercise-detail p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.exercise-detail dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 12px;
  margin: 0;
}

.exercise-detail dt {
  color: var(--rust);
  font-weight: 850;
}

.exercise-detail dd {
  margin: 0;
  color: var(--muted);
}

.exercise-solution {
  display: grid;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #ffffff;
}

.exercise-solution h4 {
  margin: 0;
}

.exercise-solution ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.answer-grid {
  display: grid;
  gap: 8px;
}

.answer-grid button {
  text-align: left;
}

.quiz-head {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
}

.quiz-score {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.quiz-score span,
.quiz-lobby span {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 9px;
  background: #ffffff;
  color: var(--muted);
}

.quiz-score strong,
.quiz-lobby strong {
  color: var(--ink);
}

.quiz-question {
  display: grid;
  gap: 12px;
}

.quiz-question > span {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 800;
}

.quiz-question h3 {
  margin: 0;
}

.quiz-question p {
  margin: 0;
  line-height: 1.45;
}

.quiz-timer {
  overflow: hidden;
  height: 10px;
  border-radius: 999px;
  background: #e5e7eb;
}

.quiz-timer span {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: var(--teal);
  transition: width 0.25s ease;
}

.answer-grid button.correct {
  border-color: var(--teal);
  background: #ccfbf1;
}

.answer-grid button.wrong {
  border-color: var(--rust);
  background: #ffedd5;
}

.quiz-lobby {
  display: grid;
  gap: 8px;
}

.meter {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: #e5e7eb;
}

.meter span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--gold));
}

.meter.small {
  height: 8px;
}

.progress-detail-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.progress-detail-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--card);
}

.progress-detail-grid strong {
  display: block;
  color: var(--ink);
  font-size: 1.05rem;
}

.progress-detail-grid span,
.domain-progress span,
.achievement-grid span {
  color: var(--muted);
  font-size: 0.84rem;
}

.progress-section {
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.progress-section h3 {
  margin: 0;
  font-size: 1rem;
}

.domain-progress {
  display: grid;
  gap: 7px;
}

.domain-progress > div:first-child {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}

.achievement-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.achievement-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #ffffff;
  opacity: 0.62;
}

.achievement-grid article.unlocked {
  border-color: var(--teal);
  background: #ecfeff;
  opacity: 1;
}

.achievement-grid strong {
  display: block;
  color: var(--ink);
}

.problem-card {
  display: grid;
  gap: 10px;
}

.problem-card strong {
  color: var(--ink);
}

.problem-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.problem-card-header small {
  color: var(--muted);
  font-weight: 750;
}

.status-open,
.status-solved,
.status-active {
  width: fit-content;
  border-radius: 999px;
  padding: 6px 9px;
  color: white;
  font-size: 0.78rem;
  font-weight: 850;
}

.status-open {
  background: var(--rust);
}

.status-solved {
  background: var(--teal);
}

.status-active {
  background: #1d4ed8;
}

.problem-card dl {
  display: grid;
  grid-template-columns: 145px 1fr;
  gap: 8px 12px;
  margin: 0;
}

.problem-card dt {
  color: var(--rust);
  font-weight: 850;
}

.problem-card dd {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.problem-references {
  display: grid;
  gap: 7px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.problem-references ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.problem-references li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 8px;
  background: #ffffff;
  color: var(--muted);
  font-size: 0.86rem;
}

.quote-card {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.quote-card blockquote {
  margin: 0;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 760;
  line-height: 1.45;
}

.quote-card div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.quote-card strong {
  color: var(--rust);
}

.quote-card span {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 750;
}

.book-card {
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.book-card-header {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.book-card-header span {
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  background: var(--card);
  color: var(--rust);
  font-size: 0.82rem;
  font-weight: 850;
}

.book-card-header small,
.book-card p {
  color: var(--muted);
}

.book-card h3,
.book-card p {
  margin: 0;
}

.book-card h3 {
  font-size: 1.14rem;
}

.book-card strong {
  color: var(--ink);
}

.glossary-card {
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.glossary-card-header {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.glossary-card-header span {
  display: inline-grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 999px;
  background: var(--teal);
  color: white;
  font-weight: 900;
}

.glossary-card h3,
.glossary-card p {
  margin: 0;
}

.glossary-card p {
  color: var(--muted);
  line-height: 1.5;
}

.glossary-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.glossary-links button {
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 9px;
  background: #ffffff;
  color: var(--ink);
  font-weight: 760;
}

.media-card {
  overflow: hidden;
  display: grid;
  grid-template-columns: 168px 1fr;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
  cursor: pointer;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.media-card-body {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.media-card-header {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.media-card-header span,
.media-tags span {
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  background: var(--card);
  color: var(--rust);
  font-size: 0.82rem;
  font-weight: 850;
}

.media-card-header small {
  color: var(--muted);
  font-weight: 780;
}

.media-card h3,
.media-card p,
.media-card dl {
  margin: 0;
}

.media-card h3 {
  font-size: 1.12rem;
}

.media-card p {
  color: var(--muted);
  line-height: 1.5;
}

.media-card dl,
.detail-kv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 10px;
}

.media-card dt,
.detail-kv dt {
  color: var(--rust);
  font-weight: 850;
}

.media-card dd,
.detail-kv dd {
  margin: 0;
  color: var(--muted);
}

.media-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.media-tags span {
  color: var(--blue);
}

.media-detail-visual {
  margin-bottom: 14px;
}

.media-visual {
  --media-accent: var(--teal);
  position: relative;
  min-height: 100%;
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--media-accent) 20%, white), white 48%),
    var(--card);
}

.media-visual.large {
  min-height: 230px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.media-visual.accent-rust {
  --media-accent: var(--rust);
}

.media-visual.accent-blue {
  --media-accent: var(--blue);
}

.media-visual.accent-ink {
  --media-accent: var(--ink);
}

.media-visual svg {
  width: 82%;
  height: 82%;
  fill: none;
  stroke: var(--media-accent);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.media-asset {
  margin: 0;
  background: #f8fafc;
}

.media-asset img {
  width: 100%;
  height: 100%;
  min-height: inherit;
  object-fit: cover;
  object-position: center;
}

.media-asset.large img {
  max-height: 460px;
  object-fit: contain;
  background: #f8fafc;
}

.media-asset figcaption {
  position: absolute;
  right: 8px;
  bottom: 8px;
  max-width: calc(100% - 16px);
  border-radius: 999px;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
}

.media-portrait::before {
  content: "";
  width: 58%;
  height: 72%;
  border-radius: 46% 46% 12px 12px;
  background:
    radial-gradient(circle at 50% 30%, #fff 0 11%, transparent 12%),
    linear-gradient(160deg, var(--media-accent), var(--blue));
  box-shadow: 0 14px 30px rgba(20, 33, 61, 0.16);
}

.media-portrait span {
  position: absolute;
  color: white;
  font-size: 1.4rem;
  font-weight: 950;
}

.media-manuscript {
  align-content: center;
  gap: 10px;
  padding: 22px;
}

.media-manuscript i,
.media-manuscript b {
  display: block;
  width: 72%;
  height: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--media-accent) 62%, white);
}

.media-manuscript i:nth-child(2) {
  width: 58%;
}

.media-manuscript i:nth-child(3) {
  width: 78%;
}

.media-manuscript b {
  width: 34%;
  height: 34px;
  border-radius: 6px;
  opacity: 0.72;
}

.media-fractal span {
  position: absolute;
  border: 2px solid var(--media-accent);
  border-radius: 50%;
}

.media-fractal span:nth-child(1) {
  width: 72%;
  height: 72%;
}

.media-fractal span:nth-child(2) {
  width: 42%;
  height: 42%;
  transform: translate(24%, -18%);
}

.media-fractal span:nth-child(3) {
  width: 28%;
  height: 28%;
  transform: translate(-36%, 18%);
}

.media-fractal span:nth-child(4) {
  width: 18%;
  height: 18%;
  transform: translate(6%, 42%);
}

.media-timeline {
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 24px;
}

.media-timeline span {
  align-self: end;
  width: 100%;
  min-height: 28px;
  border-radius: 8px 8px 0 0;
  background: var(--media-accent);
}

.media-timeline span:nth-child(2) {
  min-height: 58px;
  opacity: 0.72;
}

.media-timeline span:nth-child(3) {
  min-height: 42px;
  opacity: 0.84;
}

.media-timeline span:nth-child(4) {
  min-height: 74px;
  opacity: 0.62;
}

.media-infographic {
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 24px;
}

.media-infographic span,
.media-infographic b {
  display: block;
  aspect-ratio: 1;
  border-radius: 8px;
  background: var(--media-accent);
  opacity: 0.82;
}

.media-infographic b {
  grid-column: 1 / -1;
  aspect-ratio: auto;
  height: 12px;
  border-radius: 999px;
  opacity: 0.55;
}

.workflow {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.workflow article {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.workflow strong {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: var(--teal);
}

.teacher-workbench {
  display: grid;
  gap: 14px;
}

.teacher-controls {
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.8fr;
  gap: 12px;
}

.teacher-controls label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-weight: 800;
}

.teacher-controls select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
}

.teacher-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.teacher-sheet {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #ffffff;
}

.teacher-sheet header,
.teacher-sheet section {
  display: grid;
  gap: 8px;
}

.teacher-sheet h3,
.teacher-sheet h4,
.teacher-sheet ul,
.teacher-sheet ol {
  margin: 0;
}

.teacher-sheet ul,
.teacher-sheet ol {
  padding-left: 20px;
}

.teacher-sheet li {
  margin: 6px 0;
}

.teacher-sheet span {
  color: var(--muted);
}

.teacher-sheet:fullscreen {
  overflow: auto;
  padding: 42px;
  background: #ffffff;
}

.student-workbench {
  display: grid;
  gap: 14px;
}

.student-controls {
  display: grid;
  grid-template-columns: 1.2fr 1.2fr auto;
  gap: 12px;
  align-items: end;
}

.student-controls label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-weight: 800;
}

.student-controls select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
}

.student-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 12px;
}

.student-summary,
.flashcard,
.student-history {
  display: grid;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #ffffff;
}

.student-summary h3,
.student-summary p,
.flashcard h3,
.flashcard p,
.student-history h3,
.student-history ul {
  margin: 0;
}

.student-summary p,
.flashcard p,
.student-history li {
  color: var(--muted);
  line-height: 1.5;
}

.student-summary dl {
  display: grid;
  grid-template-columns: 105px 1fr;
  gap: 8px 10px;
  margin: 0;
}

.student-summary dt {
  color: var(--rust);
  font-weight: 850;
}

.student-summary dd {
  margin: 0;
  color: var(--muted);
}

.flashcard-header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  font-weight: 800;
}

.student-history ul {
  padding-left: 18px;
}

.formula-box {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  margin-top: 18px;
}

.formula-box label {
  grid-column: 1 / -1;
}

#plotCanvas {
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.network-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.network-tools {
  display: grid;
  gap: 12px;
  margin-bottom: 14px;
}

#knowledgeGraph {
  min-width: 760px;
  width: 100%;
  height: auto;
}

.edges line {
  stroke: rgba(20, 33, 61, 0.22);
  stroke-width: 3;
}

.node circle {
  fill: #f7fbfa;
  stroke: var(--teal);
  stroke-width: 3;
  transition: fill 0.16s ease, stroke-width 0.16s ease;
}

.node {
  cursor: pointer;
}

.node-domain circle {
  fill: #ecfeff;
}

.node-concept circle {
  stroke: var(--blue);
}

.node-person circle {
  stroke: var(--rust);
}

.node-theorem circle {
  stroke: #7c3aed;
}

.node-formula circle {
  stroke: var(--gold);
}

.node-object circle {
  stroke: #15803d;
}

.node.active circle,
.node:hover circle,
.node:focus circle {
  fill: #fff7ed;
  stroke-width: 5;
}

.node text {
  fill: var(--ink);
  font-size: 11px;
  font-weight: 800;
  pointer-events: none;
}

.node-domain text {
  font-size: 13px;
}

.network-detail {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: var(--panel);
  box-shadow: 0 12px 34px rgba(20, 33, 61, 0.07);
}

.network-detail-header {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.network-detail-header span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  background: var(--card);
  color: var(--rust);
  font-size: 0.82rem;
  font-weight: 850;
}

.network-detail-header small,
.network-detail p {
  color: var(--muted);
}

.network-detail h3,
.network-detail p {
  margin: 0;
}

.network-neighbors {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.network-neighbors button {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  background: #ffffff;
  color: var(--ink);
  font-weight: 760;
}

.module-grid article {
  min-height: 76px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px;
}

.module-grid strong {
  color: var(--rust);
  font-size: 0.88rem;
}

.module-grid span {
  font-weight: 780;
}

.module-grid small {
  border: 1px solid rgba(15, 118, 110, 0.28);
  border-radius: 999px;
  padding: 5px 9px;
  background: #ecfdf5;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

@media (max-width: 780px) {
  .app-shell {
    top: auto;
  }

  .split {
    grid-template-columns: 1fr;
  }

  .timeline-card {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .timeline-columns {
    grid-template-columns: 1fr;
  }

  .timeline-track {
    padding-left: 14px;
  }

  .formula-box {
    grid-template-columns: 1fr;
  }

  .person-card,
  .person-card dl,
  .advanced-filters,
  .favorites-tools,
  .detail-lead,
  .progress-detail-grid,
  .achievement-grid,
  .teacher-controls,
  .student-controls,
  .student-grid,
  .student-summary dl,
  .map-filters,
  .map-detail dl,
  .three-cols,
  .converter-row,
  .domain-tool-row,
  .domain-card dl,
  .theorem-tool-row,
  .theorem-card dl,
  .formula-tool-row,
  .formula-card dl,
  .object-tool-row,
  .object-card dl,
  .exercise-tool-row,
  .exercise-layout,
  .exercise-detail dl,
  .quote-tool-row,
  .book-tool-row,
  .glossary-tool-row,
  .media-tool-row,
  .media-card,
  .media-card dl,
  .detail-kv,
  .problem-tool-row,
  .problem-card dl {
    grid-template-columns: 1fr;
  }

  .learning-grid .practice-panel:first-child {
    grid-column: auto;
  }

  .detail-panel {
    top: 118px;
    width: calc(100% - 20px);
    max-height: calc(100vh - 132px);
  }

  .stats-row {
    grid-template-columns: repeat(2, auto);
  }

  .hero {
    height: 74vh;
    min-height: 620px;
    max-height: 700px;
  }
}

@media print {
  body.printing-teacher > * {
    visibility: hidden;
  }

  body.printing-teacher #teacherSheet,
  body.printing-teacher #teacherSheet * {
    visibility: visible;
  }

  body.printing-teacher #teacherSheet {
    position: absolute;
    inset: 0;
    width: auto;
    border: 0;
    box-shadow: none;
  }
}