:root {
  color-scheme: light;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background: #eef2f6;
  color: #142033;
  --line: #d7dee9;
  --muted: #667085;
  --panel: #ffffff;
  --green: #1b7f55;
  --blue: #255fbd;
  --red: #c13d36;
  --amber: #9a6700;
  --ink: #142033;
  --soft: #f7f9fc;
  --z-sticky: 10;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 6px;
  padding: 10px 12px;
  cursor: pointer;
}

button:hover {
  border-color: #7b8da5;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.danger {
  border-color: var(--red);
  color: var(--red);
}

#app {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: #fff;
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  align-items: center;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--green);
  color: #fff;
  border-radius: 7px;
  font-weight: 800;
}

.brand h1 {
  margin: 0;
  font-size: 17px;
  line-height: 1.25;
}

.brand p,
.side-stat span,
.eyebrow,
.muted,
.section-kicker {
  color: var(--muted);
}

.brand p {
  margin: 5px 0 0;
  font-size: 12px;
}

.nav {
  display: grid;
  gap: 8px;
}

.nav-button {
  text-align: left;
  background: #f8fafc;
  border-color: #e4eaf2;
  font-weight: 700;
}

.nav-button.active {
  background: #eaf5ef;
  color: #0f5132;
  border-color: #92ccb0;
}

.side-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.sidebar-bottom {
  display: grid;
  gap: 12px;
  margin-top: auto;
}

.sidebar-github {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  margin-top: 0;
  color: #475467;
  font-size: 11px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
}

.sidebar-github:hover {
  color: var(--green);
}

.sidebar-github svg {
  width: 17px;
  height: 17px;
  fill: currentColor;
  flex: 0 0 auto;
}

.main {
  padding: 18px 22px 28px;
  min-width: 0;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.toolbar h2 {
  margin: 0;
  font-size: 26px;
}

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.toolbar-actions button,
.toolbar-actions select {
  height: 44px;
}

.subject-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.subject-switch select {
  min-width: 156px;
  padding: 0 28px 0 10px;
}

@media (min-width: 781px) {
  body {
    height: 100vh;
    overflow: hidden;
  }

  #app {
    height: 100vh;
    min-height: 0;
    overflow: hidden;
  }

  .sidebar {
    min-height: 0;
    overflow-y: auto;
  }

  .main {
    height: 100vh;
    overflow-y: auto;
    padding: 0 22px 28px;
    scrollbar-gutter: stable;
  }

  .toolbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    margin-bottom: 10px;
    padding: 18px 0 12px;
    background: #eef2f6;
  }
}

.eyebrow,
.section-kicker {
  margin: 0 0 3px;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 12px;
  font-weight: 800;
}

.notice {
  position: fixed;
  top: 18px;
  left: 50%;
  z-index: 1000;
  width: min(360px, calc(100vw - 32px));
  padding: 12px 14px;
  border-radius: 6px;
  background: #e9f5ff;
  border: 1px solid #a9d7ff;
  box-shadow: 0 8px 24px rgba(18, 35, 52, 0.14);
  pointer-events: none;
  transform: translateX(-50%);
  animation: notice-in 180ms ease-out;
}

@keyframes notice-in {
  from { opacity: 0; transform: translate(-50%, -8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.notice.error {
  background: #fff0f0;
  border-color: #ffb4b4;
}

.notice.warn {
  background: #fff8e7;
  border-color: #f3cf72;
}

.study-drawer,
.filter-drawer {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 10px;
}

.study-drawer > summary,
.filter-drawer > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  cursor: pointer;
  font-weight: 800;
}

.study-drawer > summary strong {
  color: var(--blue);
  font-size: 13px;
}

.overview-board {
  display: grid;
  grid-template-columns: minmax(320px, 1.5fr) minmax(260px, 1fr) minmax(240px, 0.9fr);
  gap: 12px;
  padding: 0 14px 14px;
}

.plan-card,
.site-card,
.source-card,
.panel,
.metric,
.question-paper,
.source-box,
.queue-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

.plan-card,
.site-card,
.source-card,
.panel,
.question-paper,
.source-box,
.queue-panel {
  padding: 16px;
}

.plan-card h3,
.site-card h3,
.source-card h3,
.panel h3,
.queue-panel h3 {
  margin: 4px 0 10px;
}

.plan-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.plan-step {
  border-left: 3px solid var(--green);
  background: #f4fbf7;
  padding: 9px 11px;
  border-radius: 6px;
}

.plan-step strong,
.plan-step span {
  display: block;
}

.plan-step span,
.feature-list,
.source-card p {
  color: #475467;
  line-height: 1.55;
  font-size: 14px;
}

.feature-list {
  margin: 0;
  padding-left: 18px;
}

.view {
  display: none;
}

.active-view {
  display: block;
}

.type-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(170px, 1fr));
  gap: 9px;
  margin-bottom: 10px;
}

.type-button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3px 10px;
  align-items: center;
  min-height: 54px;
  text-align: left;
  background: #fff;
}

.type-button span {
  font-weight: 800;
}

.type-button strong {
  color: var(--blue);
  font-size: 18px;
}

.type-button small {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 12px;
  display: none;
}

.type-button.active {
  border-color: var(--green);
  background: #eef8f2;
  box-shadow: inset 0 0 0 1px rgba(27, 127, 85, 0.12);
}

.mode-board {
  display: flex;
  gap: 9px;
  margin-bottom: 10px;
  overflow-x: auto;
  padding-bottom: 4px;
  scroll-snap-type: x proximity;
}

.mode-button {
  flex: 1 0 132px;
  text-align: left;
  display: grid;
  gap: 3px;
  min-height: 58px;
  background: #fff;
  scroll-snap-align: start;
}

.mode-button b,
.mode-button strong,
.mode-button span {
  display: block;
}

.mode-button strong {
  color: var(--blue);
  font-size: 17px;
  line-height: 1.15;
}

.mode-button span {
  color: var(--muted);
  font-size: 12px;
}

.mode-button.active {
  border-color: var(--blue);
  background: #edf4ff;
  box-shadow: inset 0 0 0 1px rgba(37, 95, 189, 0.12);
}

.chapter-drawer {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 10px;
}

.chapter-drawer > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
  font-weight: 800;
}

.chapter-drawer > summary strong {
  color: var(--muted);
  font-size: 12px;
}

.chapter-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 0 10px 10px;
  scroll-snap-type: x proximity;
}

.chapter-item {
  flex: 0 0 220px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5px 8px;
  min-height: 66px;
  padding: 9px;
  text-align: left;
  scroll-snap-align: start;
}

.chapter-item span,
.chapter-item b,
.chapter-item small,
.chapter-item em,
.chapter-item i {
  display: block;
}

.chapter-item b {
  margin-bottom: 2px;
}

.chapter-item small,
.chapter-item em {
  color: var(--muted);
  font-size: 12px;
  font-style: normal;
}

.chapter-item strong {
  color: var(--red);
  font-size: 13px;
}

.chapter-item i {
  grid-column: 1 / -1;
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: #eef2f7;
}

.chapter-item mark {
  display: block;
  height: 100%;
  background: var(--green);
}

.chapter-item.active {
  border-color: var(--blue);
  background: #edf4ff;
}

.filters {
  display: grid;
  grid-template-columns: 100px repeat(4, minmax(120px, 1fr)) minmax(150px, 1fr) auto;
  gap: 10px;
  border: 0;
  box-shadow: none;
  padding-top: 0;
}

.filters label {
  display: grid;
  gap: 6px;
  font-size: 12px;
  color: #526070;
  font-weight: 800;
}

select,
input {
  width: 100%;
  border: 1px solid #c8d1dc;
  border-radius: 6px;
  padding: 10px;
  background: #fff;
  color: #172033;
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 248px;
  gap: 14px;
  align-items: start;
}

.question-panel {
  min-width: 0;
}

.question-paper {
  min-height: 560px;
}

.question-topline {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 14px;
  align-items: start;
  border-bottom: 1px solid #eef2f7;
  padding-bottom: 13px;
  margin-bottom: 16px;
}

.question-progress {
  border: 1px solid #bad0ef;
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--blue);
  background: #f4f8ff;
  font-weight: 800;
  min-width: 58px;
  text-align: center;
}

.question-paper h3 {
  margin: 10px 0 0;
  line-height: 1.62;
  font-size: 22px;
  font-weight: 800;
}

.question-paper h3 p,
.analysis-body p {
  margin: 0 0 10px;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.question-meta span,
.meta-warn {
  display: inline-flex;
  align-items: center;
  border: 1px solid #dce5f1;
  background: #f8fafc;
  border-radius: 999px;
  padding: 4px 8px;
}

.question-meta .meta-warn {
  color: var(--amber);
  border-color: #efd48a;
  background: #fff8e7;
}

.question-meta .memory-chip {
  font-weight: 800;
}

.question-meta .memory-new {
  color: #475467;
}

.question-meta .memory-due {
  color: var(--red);
  border-color: #ffb4b4;
  background: #fff1f1;
}

.question-meta .memory-learning {
  color: var(--blue);
  border-color: #bad0ef;
  background: #f4f8ff;
}

.question-meta .memory-mastered {
  color: var(--green);
  border-color: #9ed8b5;
  background: #edf9f2;
}

.question-meta .bookmark-chip {
  color: var(--amber);
  border-color: #efd48a;
  background: #fff8e7;
  font-weight: 800;
}

.question-meta .figure-chip {
  color: #285f9f;
  border-color: #bad0ef;
  background: #f4f8ff;
  font-weight: 800;
}

.question-figure {
  margin: -2px 0 16px;
}

.question-diagram,
.figure-unavailable {
  margin: 0;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  background: #f8fafc;
}

.diagram-scroll {
  overflow-x: auto;
  padding: 14px;
}

.question-diagram svg {
  display: block;
  min-width: 620px;
  width: 100%;
  height: auto;
}

.question-diagram figcaption {
  padding: 9px 14px 11px;
  border-top: 1px solid #dbe3ef;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.figure-layer,
.figure-node,
.figure-class-card {
  fill: #ffffff;
  stroke: #9fb6d2;
  stroke-width: 1.5;
}

.figure-hardware {
  fill: #edf9f2;
  stroke: #71c499;
}

.figure-label,
.figure-node-label,
.figure-class-title,
.figure-class-text,
.figure-edge-label {
  fill: #172033;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

.figure-label,
.figure-node-label,
.figure-class-title {
  font-size: 18px;
  font-weight: 800;
}

.figure-class-text,
.figure-edge-label {
  font-size: 13px;
}

.figure-edge,
.figure-class-divider {
  stroke: #6b89aa;
  stroke-width: 1.5;
}

.figure-arrow-head {
  fill: #6b89aa;
}

.figure-unavailable {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  color: #475467;
  line-height: 1.55;
}

.figure-unavailable strong {
  color: var(--amber);
}

.option-list {
  display: grid;
  gap: 10px;
}

.option {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  text-align: left;
  align-items: start;
  line-height: 1.6;
  padding: 13px 14px;
  min-height: 56px;
  border-color: #dbe3ef;
}

.option b {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  background: #eef2f7;
  border-radius: 50%;
  color: #344054;
}

.option-text {
  min-width: 0;
  padding-top: 1px;
}

.option.locked {
  cursor: default;
}

.option.selected {
  border-color: var(--blue);
  background: #f4f8ff;
}

.option.correct-choice {
  border-color: #71c499;
  background: #edf9f2;
}

.option.correct-choice b {
  background: var(--green);
  color: #fff;
}

.option.wrong-choice {
  border-color: #ef9a9a;
  background: #fff1f1;
}

.option.wrong-choice b {
  background: var(--red);
  color: #fff;
}

.answer-row,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.answer-row .marked {
  border-color: #efd48a;
  background: #fff8e7;
  color: var(--amber);
  font-weight: 800;
}

.answer-result {
  margin-top: 16px;
  padding: 15px;
  border-radius: 8px;
  line-height: 1.7;
}

.answer-result.correct {
  background: #edf9f2;
  border: 1px solid #9ed8b5;
}

.answer-result.wrong {
  background: #fff2f2;
  border: 1px solid #ffb4b4;
}

.answer-title {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  margin-bottom: 8px;
}

.answer-title h4 {
  margin: 0;
  font-size: 18px;
}

.answer-title span {
  color: #475467;
}

.analysis-body {
  color: #253044;
}

.analysis-body h5 {
  margin: 0 0 8px;
  font-size: 16px;
}

.analysis-muted {
  color: #5f6b7a;
}

.retry-answer {
  margin-top: 10px;
  background: #fff;
}

.ai-explanation {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid currentColor;
}

.case-ai-explanation {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.case-ai-explanation h5 {
  margin: 0 0 8px;
  font-size: 16px;
}

.case-ai-explanation button {
  margin-top: 8px;
  background: #fff;
}

.case-reference {
  color: #475467;
  white-space: normal;
}

.case-reference > p {
  white-space: pre-wrap;
}

.ai-explanation h5 {
  margin: 0 0 8px;
  font-size: 16px;
}

.ai-stream-status {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
}

.ai-stream-output {
  min-height: 1.7em;
  white-space: pre-wrap;
}

.ai-explain-button {
  margin-top: 8px;
  background: #fff;
}

.ai-error {
  color: var(--red);
}

.essay-sample {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.essay-template summary {
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
}

.essay-template p {
  color: #475467;
  line-height: 1.65;
}

.essay-sample-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.essay-sample-heading h5,
.essay-sample-stream h5,
.essay-sample-content h5 {
  margin: 0 0 8px;
  font-size: 16px;
}

.essay-sample-heading span {
  color: var(--muted);
  font-size: 12px;
}

.essay-sample-content {
  line-height: 1.75;
}

.essay-sample-content h5:not(:first-child) {
  margin-top: 18px;
}

.essay-sample-content h5 small {
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
}

.essay-sample-content p {
  margin: 0 0 10px;
}

.essay-sample-stream {
  margin-top: 12px;
}

.essay-sample-draft {
  margin-top: 12px;
  padding: 12px;
  border: 1px solid #efd48a;
  background: #fff8e7;
}

.essay-sample-draft .essay-sample-heading span {
  color: var(--amber);
}

.essay-sample-actions {
  margin-top: 12px;
}

.essay-sample-warning {
  color: var(--amber);
  line-height: 1.65;
}

.essay-sample-note {
  color: #475467;
  line-height: 1.65;
}

.ai-key-field {
  display: grid;
  gap: 6px;
  font-weight: 800;
}

.source-box {
  margin-top: 10px;
  display: grid;
  gap: 8px;
  box-shadow: none;
}

.source-box div {
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 10px;
  color: #475467;
  font-size: 13px;
}

.source-box b {
  color: var(--ink);
}

.queue-panel {
  align-self: start;
  position: sticky;
  top: 14px;
}

.queue-panel p {
  margin: 0 0 12px;
  color: var(--muted);
}

.queue-toolbar {
  display: grid;
  grid-template-columns: 34px 1fr 34px;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}

.queue-toolbar button {
  padding: 6px 0;
  min-width: 0;
  font-size: 18px;
  line-height: 1;
}

.queue-toolbar span {
  color: #475467;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}

.exam-term-wrap {
  display: grid;
  gap: 5px;
  margin: -2px 0 12px;
  color: #5d6978;
  font-size: 12px;
  font-weight: 800;
}

.exam-term-wrap select {
  width: 100%;
  min-width: 0;
  padding: 8px 10px;
}

.exam-term-wrap[hidden] {
  display: none !important;
}

.queue-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 10px;
  margin-bottom: 12px;
  color: #5d6978;
  font-size: 12px;
}

.queue-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.queue-legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
}

.queue-legend .legend-current {
  border-color: var(--blue);
  background: #f4f8ff;
}

.queue-legend .legend-ok {
  border-color: #9ed8b5;
  background: #eaf8f0;
}

.queue-legend .legend-bad {
  border-color: #ffb4b4;
  background: #fff0f0;
}

.question-queue {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
  max-height: 560px;
  overflow: auto;
}

.queue-item {
  padding: 8px 0;
  min-width: 0;
}

.queue-item.active {
  border-color: var(--blue);
  color: var(--blue);
  font-weight: 800;
  background: #f4f8ff;
}

.queue-item.ok {
  background: #eaf8f0;
}

.queue-item.bad {
  background: #fff0f0;
}

.table-wrap {
  overflow-x: auto;
  margin: 10px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f3f6fa;
}

.stats-grid,
.data-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.data-grid {
  grid-template-columns: repeat(2, minmax(240px, 1fr));
}

.progress-preview {
  min-height: 72px;
  border: 1px dashed #c8d1dc;
  border-radius: 8px;
  padding: 10px;
  background: #fbfcfe;
  margin: 10px 0;
}

.progress-preview p {
  margin: 0;
}

.progress-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 8px;
}

.progress-preview-grid span {
  display: grid;
  gap: 3px;
  color: #253044;
  font-size: 13px;
}

.progress-preview-grid b {
  color: var(--muted);
  font-size: 12px;
}

.metric {
  padding: 16px;
}

.metric span {
  display: block;
  color: var(--muted);
  margin-bottom: 8px;
}

.metric strong {
  font-size: 28px;
}

.stat-table {
  display: grid;
  gap: 8px;
}

.stat-row {
  display: grid;
  grid-template-columns: 1fr 80px 80px;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid #eef2f7;
}

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

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

.item-card h4 {
  margin: 8px 0;
  line-height: 1.5;
}

.item-card p {
  line-height: 1.65;
}

.analysis {
  white-space: pre-wrap;
  background: #f4f6f8;
  border-radius: 6px;
  padding: 10px;
}

.file-button {
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  padding: 10px 12px;
  cursor: pointer;
}

.file-button input {
  display: none;
}

.materials-layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  align-items: start;
  gap: 16px;
}

.material-index {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 12px;
  max-height: calc(100vh - 108px);
  overflow: auto;
}

.material-search {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.material-search input {
  width: 100%;
}

.material-select {
  display: none;
}

.material-list {
  display: grid;
  gap: 6px;
}

.material-item {
  display: grid;
  gap: 3px;
  min-height: 52px;
  padding: 9px 10px;
  text-align: left;
  background: var(--soft);
}

.material-item span {
  color: var(--muted);
  font-size: 11px;
}

.material-item b {
  font-size: 13px;
  line-height: 1.35;
}

.material-item.active {
  border-color: #92ccb0;
  background: #eaf5ef;
  color: #0f5132;
}

.material-reader {
  min-width: 0;
  padding: 22px;
}

.material-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.material-header h3,
.material-header p {
  margin: 0;
}

.material-header h3 {
  margin: 4px 0 8px;
  font-size: 24px;
}

.material-header p:not(.section-kicker) {
  color: var(--muted);
  font-size: 13px;
}

.material-header a {
  flex: 0 0 auto;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.markdown-content {
  max-width: 75ch;
  overflow-wrap: anywhere;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
  margin: 1.6em 0 0.65em;
  line-height: 1.32;
}

.markdown-content h1 {
  font-size: 24px;
}

.markdown-content h2 {
  font-size: 21px;
}

.markdown-content h3 {
  font-size: 18px;
}

.markdown-content p,
.markdown-content li {
  line-height: 1.78;
}

.markdown-content ul,
.markdown-content ol {
  padding-left: 24px;
}

.markdown-content blockquote {
  margin: 16px 0;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  color: #475467;
}

.markdown-content pre {
  overflow: auto;
  padding: 14px;
  border-radius: 6px;
  background: #1f2937;
  color: #e5edf8;
}

.markdown-content code {
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
}

.markdown-content :not(pre) > code {
  padding: 1px 4px;
  border-radius: 4px;
  background: #eef2f6;
}

.markdown-content a {
  color: var(--blue);
}

@media (max-width: 1180px) {
  .overview-board,
  .mode-board,
  .filters,
  .practice-layout,
  .stats-grid,
  .data-grid {
    grid-template-columns: 1fr;
  }

  .plan-list {
    grid-template-columns: 1fr;
  }

  .queue-panel {
    position: static;
  }

  .materials-layout {
    grid-template-columns: 1fr;
  }

  .material-index {
    position: static;
    max-height: none;
  }
}

@media (max-width: 780px) {
  #app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    padding: 12px 16px;
    gap: 10px;
  }

  .brand {
    grid-template-columns: 38px 1fr;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand h1 {
    font-size: 16px;
  }

  .brand p,
  .side-stat {
    display: none;
  }

  .sidebar-bottom {
    margin-top: 0;
  }

  .sidebar-github {
    margin-top: 0;
  }

  .nav {
    grid-template-columns: repeat(3, 1fr);
    gap: 7px;
  }

  .nav-button {
    padding: 9px 11px;
  }

  .main {
    padding: 12px 16px 18px;
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
  }

  .toolbar-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    width: 100%;
  }

  .subject-switch,
  .subject-switch select {
    min-width: 0;
  }

  .toolbar h2 {
    font-size: 22px;
  }

  .toolbar-actions .primary {
    padding: 0 12px;
  }

  .study-drawer > summary,
  .filter-drawer > summary {
    align-items: flex-start;
    flex-direction: column;
  }

  .mode-board {
    display: flex;
    overflow-x: auto;
    padding-bottom: 4px;
    scroll-snap-type: x proximity;
  }

  .type-board {
    display: flex;
    overflow-x: auto;
    padding-bottom: 4px;
    scroll-snap-type: x proximity;
  }

  .type-button {
    flex: 0 0 206px;
    min-height: 54px;
    scroll-snap-align: start;
  }

  .mode-button {
    flex: 0 0 172px;
    min-height: 64px;
    scroll-snap-align: start;
  }

  .question-paper {
    min-height: auto;
    padding: 14px;
  }

  .question-topline {
    grid-template-columns: 1fr;
  }

  .question-progress {
    justify-self: start;
  }

  .question-paper h3 {
    font-size: 19px;
  }

  .option {
    grid-template-columns: 32px 1fr;
    padding: 12px;
  }

  .source-box div {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .material-index {
    padding: 14px;
  }

  .material-search,
  .material-list {
    display: none;
  }

  .material-select {
    display: grid;
    gap: 6px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
  }

  .material-select select {
    min-height: 44px;
    width: 100%;
  }

  .material-reader {
    padding: 16px;
  }

  .material-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .material-header h3 {
    font-size: 21px;
  }

  .markdown-content {
    max-width: none;
  }
}

@media (max-width: 480px) {
  .toolbar-actions {
    grid-template-columns: 1fr 1fr;
  }

  .subject-switch {
    grid-column: 1 / -1;
    display: block;
  }

  .toolbar-actions button {
    width: 100%;
  }
}