:root {
  color-scheme: light;
  --ink: #18221e;
  --muted: #66716b;
  --line: #dce3de;
  --line-strong: #c8d1cb;
  --paper: #ffffff;
  --canvas: #f3f6f3;
  --sidebar: #eef2ee;
  --primary: #176b56;
  --primary-strong: #0e5141;
  --primary-soft: #e4f2ec;
  --amber: #c78216;
  --amber-soft: #fff5dc;
  --coral: #c94f45;
  --coral-soft: #fff0ed;
  --charcoal: #25332d;
  --on-accent: #ffffff;
  --surface-control: #ffffff;
  --surface-hover: #fafcfb;
  --topbar-surface: rgba(255, 255, 255, 0.96);
  --surface-overlay-strong: rgba(255, 255, 255, 0.78);
  --surface-overlay-medium: rgba(255, 255, 255, 0.7);
  --surface-overlay-soft: rgba(255, 255, 255, 0.45);
  --progress-muted: #edf0ed;
  --ring-track: #dfe5e1;
  --text-deep: #17211d;
  --text-body: #34403a;
  --text-detail: #536159;
  --text-heading: #415149;
  --mode-text: #48544e;
  --placeholder: #909a94;
  --analysis-surface: #f8fcfa;
  --wrong-analysis-surface: #fffafa;
  --clause-surface: #f6faf8;
  --focus-ring: rgba(23, 107, 86, 0.22);
  --focus-shadow: rgba(23, 107, 86, 0.08);
  --accent-divider: rgba(23, 107, 86, 0.15);
  --modal-backdrop: rgba(20, 30, 26, 0.5);
  --mobile-scrim: rgba(20, 30, 26, 0.42);
  --mobile-shadow: 0 -16px 36px rgba(25, 42, 34, 0.18);
  --primary-border-soft: #b8d8cb;
  --primary-border-hover: #9fb5aa;
  --control-border-hover: #aab7af;
  --analysis-border: #c7ddd3;
  --wrong-analysis-border: #edc3bd;
  --amber-border: #e2be79;
  --amber-heading: #87580f;
  --amber-text: #6f5a2a;
  --shadow: 0 18px 45px rgba(25, 42, 34, 0.12);
  --topbar-height: 64px;
  --sidebar-width: 248px;
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  font-synthesis: none;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: #edf3f7;
  --muted: #9cabb8;
  --line: #2d3b47;
  --line-strong: #465866;
  --paper: #111820;
  --canvas: #0b1118;
  --sidebar: #151e27;
  --primary: #51c9a8;
  --primary-strong: #7bdabb;
  --primary-soft: #14362f;
  --amber: #e6b85c;
  --amber-soft: #302917;
  --coral: #f1847d;
  --coral-soft: #392426;
  --charcoal: #1d2c38;
  --surface-control: #1a242e;
  --surface-hover: #212e39;
  --topbar-surface: rgba(17, 24, 32, 0.97);
  --surface-overlay-strong: rgba(255, 255, 255, 0.09);
  --surface-overlay-medium: rgba(255, 255, 255, 0.07);
  --surface-overlay-soft: rgba(255, 255, 255, 0.05);
  --progress-muted: #25323d;
  --ring-track: #34434f;
  --text-deep: #f3f7fa;
  --text-body: #d7e0e7;
  --text-detail: #b7c4ce;
  --text-heading: #cfdae2;
  --mode-text: #b5c2cc;
  --placeholder: #72818d;
  --analysis-surface: #12261f;
  --wrong-analysis-surface: #2c2022;
  --clause-surface: #162720;
  --focus-ring: rgba(81, 201, 168, 0.34);
  --focus-shadow: rgba(81, 201, 168, 0.14);
  --accent-divider: rgba(81, 201, 168, 0.23);
  --modal-backdrop: rgba(3, 7, 12, 0.72);
  --mobile-scrim: rgba(3, 7, 12, 0.68);
  --mobile-shadow: 0 -16px 36px rgba(0, 0, 0, 0.4);
  --primary-border-soft: #326a5d;
  --primary-border-hover: #55786f;
  --control-border-hover: #607382;
  --analysis-border: #2d5f51;
  --wrong-analysis-border: #714348;
  --amber-border: #75643b;
  --amber-heading: #f0ca77;
  --amber-text: #dfc17d;
  --shadow: 0 18px 45px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  min-width: 320px;
  min-height: 100%;
  background: var(--canvas);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  letter-spacing: 0;
}

button,
input,
select {
  color: inherit;
  font: inherit;
  letter-spacing: 0;
}

button,
select {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: fixed;
  z-index: 40;
  top: 0;
  right: 0;
  left: 0;
  height: var(--topbar-height);
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(220px, 620px) auto;
  align-items: center;
  gap: 24px;
  padding: 0 24px 0 20px;
  border-bottom: 1px solid var(--line);
  background: var(--topbar-surface);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 6px;
  color: var(--on-accent);
  background: var(--primary);
  font-size: 17px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 14px;
  line-height: 1.2;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
}

.topbar-search {
  min-width: 0;
}

.search-field {
  height: 38px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--canvas);
  color: var(--muted);
}

.search-field:focus-within {
  border-color: var(--primary);
  background: var(--surface-control);
  box-shadow: 0 0 0 3px var(--focus-shadow);
}

.search-field input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  font-size: 13px;
}

.search-field input::placeholder {
  color: var(--placeholder);
}

.icon-button {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-control);
  font-size: 19px;
  line-height: 1;
}

.icon-button:hover {
  border-color: var(--line-strong);
  background: var(--canvas);
}

.icon-button.is-favorite {
  border-color: var(--amber-border);
  color: var(--amber);
  background: var(--amber-soft);
}

.topbar-actions {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: 8px;
}

.theme-icon {
  font-size: 18px;
  transform: translateY(-1px);
}

#themeButton[aria-pressed="true"] {
  border-color: var(--primary-border-soft);
  color: var(--primary-strong);
  background: var(--primary-soft);
}

.mobile-only,
.mobile-close {
  display: none;
}

.sidebar {
  position: fixed;
  z-index: 30;
  top: var(--topbar-height);
  bottom: 0;
  left: 0;
  width: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
  background: var(--sidebar);
}

.sidebar-scroll {
  overflow-y: auto;
  flex: 1;
  padding: 20px 14px;
}

.sidebar-section + .sidebar-section {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.section-label,
.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
}

.section-label {
  text-transform: uppercase;
}

.section-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.tiny-meta {
  color: var(--muted);
  font-size: 11px;
}

.mode-nav {
  display: grid;
  gap: 4px;
  margin-top: 10px;
}

.mode-button {
  min-height: 40px;
  display: grid;
  grid-template-columns: 22px 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border: 0;
  border-radius: 5px;
  color: var(--mode-text);
  background: transparent;
  text-align: left;
  font-size: 13px;
}

.mode-button:hover {
  color: var(--ink);
  background: var(--surface-overlay-medium);
}

.mode-button.is-active {
  color: var(--on-accent);
  background: var(--charcoal);
  font-weight: 700;
}

.mode-icon {
  font-size: 17px;
  text-align: center;
}

.mode-count {
  min-width: 22px;
  height: 20px;
  display: inline-grid;
  place-items: center;
  padding: 0 6px;
  border-radius: 10px;
  color: var(--muted);
  background: var(--surface-overlay-strong);
  font-size: 10px;
}

.mode-button.is-active .mode-count {
  color: var(--charcoal);
}

.field-label {
  display: block;
  margin: 10px 0 6px;
  color: var(--muted);
  font-size: 11px;
}

.select-control {
  width: 100%;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--surface-control);
  font-size: 13px;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 5px;
  margin-top: 10px;
}

.segmented-control button {
  height: 32px;
  padding: 0 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  background: var(--surface-overlay-medium);
  font-size: 11px;
}

.segmented-control button.is-active {
  border-color: var(--primary);
  color: var(--primary-strong);
  background: var(--primary-soft);
  font-weight: 700;
}

.sidebar-copy {
  margin: 4px 0 12px;
  color: var(--muted);
  font-size: 11px;
}

.sidebar-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 13px 14px;
  border-top: 1px solid var(--line);
  background: var(--surface-overlay-soft);
}

.data-status {
  color: var(--muted);
  font-size: 10px;
}

.data-status i {
  width: 6px;
  height: 6px;
  display: inline-block;
  margin-right: 4px;
  border-radius: 50%;
  background: var(--primary);
}

.text-button {
  padding: 3px;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-size: 10px;
}

.text-button:hover {
  color: var(--coral);
}

.workspace {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  margin-left: var(--sidebar-width);
  padding-top: var(--topbar-height);
}

.practice-panel {
  min-width: 0;
  background: var(--paper);
}

.session-bar {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px clamp(22px, 4vw, 54px);
  border-bottom: 1px solid var(--line);
}

.session-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.session-bar h1 {
  margin: 0;
  font-size: 16px;
  line-height: 1.3;
}

.session-bar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.small-button {
  height: 28px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--primary-strong);
  background: var(--primary-soft);
  font-size: 10px;
}

.session-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.progress-copy {
  min-width: 62px;
  display: flex;
  align-items: baseline;
  justify-content: flex-end;
  gap: 3px;
  color: var(--muted);
  font-size: 12px;
}

.progress-copy strong {
  color: var(--ink);
  font-size: 20px;
}

.progress-track {
  height: 3px;
  background: var(--progress-muted);
}

.progress-track span {
  width: 0;
  height: 100%;
  display: block;
  background: var(--primary);
  transition: width 180ms ease;
}

.question-view {
  width: min(100%, 880px);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 58px) clamp(22px, 5vw, 62px) 40px;
}

.question-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.question-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
}

.tag {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  background: var(--canvas);
  font-size: 10px;
}

.type-tag {
  border-color: var(--primary-border-soft);
  color: var(--primary-strong);
  background: var(--primary-soft);
  font-weight: 700;
}

.topic-text {
  color: var(--muted);
  font-size: 11px;
}

.answer-state {
  flex: 0 0 auto;
  font-size: 11px;
  font-weight: 700;
}

.answer-state.correct {
  color: var(--primary);
}

.answer-state.wrong {
  color: var(--coral);
}

.question-stem {
  margin: 25px 0 24px;
  color: var(--text-deep);
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 700;
  line-height: 1.75;
}

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

.option-button {
  width: 100%;
  min-height: 54px;
  display: grid;
  grid-template-columns: 32px 1fr 20px;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text-body);
  background: var(--surface-control);
  text-align: left;
  line-height: 1.6;
  transition: border-color 120ms ease, background 120ms ease, transform 120ms ease;
}

.option-button:hover:not(:disabled) {
  border-color: var(--primary-border-hover);
  background: var(--surface-hover);
  transform: translateY(-1px);
}

.option-letter {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--canvas);
  font-size: 12px;
  font-weight: 800;
}

.option-text {
  min-width: 0;
  overflow-wrap: anywhere;
  font-size: 13px;
}

.option-check {
  color: transparent;
  font-size: 16px;
  text-align: center;
}

.option-button.is-selected {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.option-button.is-selected .option-letter {
  border-color: var(--primary);
  color: var(--on-accent);
  background: var(--primary);
}

.option-button.is-selected .option-check {
  color: var(--primary);
}

.option-button.is-correct {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.option-button.is-correct .option-letter {
  border-color: var(--primary);
  color: var(--on-accent);
  background: var(--primary);
}

.option-button.is-correct .option-check {
  color: var(--primary);
}

.option-button.is-wrong {
  border-color: var(--coral);
  background: var(--coral-soft);
}

.option-button.is-wrong .option-letter {
  border-color: var(--coral);
  color: var(--on-accent);
  background: var(--coral);
}

.option-button.is-wrong .option-check {
  color: var(--coral);
}

.question-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.primary-button,
.secondary-button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 18px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 700;
}

.primary-button {
  border: 1px solid var(--primary);
  color: var(--on-accent);
  background: var(--primary);
}

.primary-button:hover:not(:disabled) {
  border-color: var(--primary-strong);
  background: var(--primary-strong);
}

.secondary-button {
  border: 1px solid var(--line-strong);
  color: var(--text-body);
  background: var(--surface-control);
}

.secondary-button:hover:not(:disabled) {
  border-color: var(--control-border-hover);
  background: var(--canvas);
}

.full-width {
  width: 100%;
}

.explanation {
  margin-top: 30px;
  padding: 24px;
  border: 1px solid var(--analysis-border);
  border-left: 4px solid var(--primary);
  border-radius: 6px;
  background: var(--analysis-surface);
}

.explanation.is-wrong {
  border-color: var(--wrong-analysis-border);
  border-left-color: var(--coral);
  background: var(--wrong-analysis-surface);
}

.explanation-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.explanation h3,
.explanation h4,
.insight-section h2 {
  margin: 0;
}

.explanation h3 {
  margin-top: 3px;
  font-size: 17px;
}

.result-mark {
  width: 34px;
  height: 34px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  color: var(--on-accent);
  background: var(--primary);
  font-size: 18px;
  font-weight: 800;
}

.explanation.is-wrong .result-mark {
  background: var(--coral);
}

.analysis-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--accent-divider);
}

.analysis-grid h4,
.option-analysis-section h4,
.web-sources h4,
.mistake-note strong {
  color: var(--text-heading);
  font-size: 11px;
}

.analysis-grid p,
.mistake-note p {
  margin: 7px 0 0;
  color: var(--text-detail);
  font-size: 12px;
  line-height: 1.8;
}

.mistake-note {
  margin-top: 18px;
  padding: 13px 14px;
  border-radius: 5px;
  background: var(--amber-soft);
}

.option-analysis-section {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--accent-divider);
}

.option-analysis-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 18px;
  margin-top: 10px;
}

.option-analysis-item {
  display: grid;
  grid-template-columns: 22px 1fr;
  align-items: start;
  gap: 8px;
}

.option-analysis-item > span {
  width: 21px;
  height: 21px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--muted);
  background: var(--surface-control);
  font-size: 9px;
  font-weight: 800;
}

.option-analysis-item.is-correct > span {
  border-color: var(--primary);
  color: var(--on-accent);
  background: var(--primary);
}

.option-analysis-item p {
  margin: 0;
  color: var(--text-detail);
  font-size: 11px;
  line-height: 1.7;
}

.clause-section {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--accent-divider);
}

.clause-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.clause-section h4 {
  margin: 3px 0 0;
  color: var(--text-heading);
  font-size: 12px;
  line-height: 1.5;
}

.clause-label {
  flex: none;
  padding: 4px 8px;
  border-radius: 4px;
  color: var(--primary-strong);
  background: var(--primary-soft);
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
}

.clause-text {
  margin: 10px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--primary);
  border-radius: 0 5px 5px 0;
  background: var(--clause-surface);
  color: var(--text-body);
  font-size: 12px;
  line-height: 1.9;
  text-align: justify;
}

.clause-link {
  display: inline-block;
  margin-top: 9px;
  color: var(--primary-strong);
  font-size: 11px;
  font-weight: 600;
  text-decoration: none;
}

.clause-link:hover {
  text-decoration: underline;
}

.web-sources {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--accent-divider);
}

.source-heading-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.web-sources h4 {
  margin-top: 3px;
  font-size: 13px;
}

.verified-badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 7px;
  border-radius: 4px;
  color: var(--primary-strong);
  background: var(--primary-soft);
  font-size: 9px;
  font-weight: 700;
}

.verified-badge.is-principle {
  color: var(--amber-text);
  background: var(--amber-soft);
}

.source-list {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}

.source-list a {
  min-width: 0;
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr) 16px;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: inherit;
  background: var(--surface-control);
  text-decoration: none;
}

.source-list a:hover {
  border-color: var(--primary-border-hover);
}

.source-domain {
  overflow: hidden;
  color: var(--primary-strong);
  font-size: 9px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-list strong {
  min-width: 0;
  overflow: hidden;
  font-size: 10px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.source-arrow {
  color: var(--primary);
  text-align: right;
}

.version-note,
.no-source-copy {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.6;
}

.no-source-copy {
  margin: 0;
  padding: 9px 10px;
  border-left: 2px solid var(--amber-border);
  background: var(--amber-soft);
}

.mistake-note strong {
  color: var(--amber-heading);
}

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 16px;
  color: var(--primary-strong);
  font-size: 11px;
  font-weight: 700;
  text-decoration: none;
}

.source-link:hover {
  text-decoration: underline;
}

.insights-panel {
  min-width: 0;
  border-left: 1px solid var(--line);
  background: var(--canvas);
}

.insight-section {
  padding: 24px 20px;
}

.insight-section + .insight-section {
  border-top: 1px solid var(--line);
}

.insight-section h2 {
  margin-top: 4px;
  font-size: 14px;
}

.accuracy-ring {
  --accuracy: 0deg;
  position: relative;
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--primary) var(--accuracy), var(--ring-track) 0);
}

.accuracy-ring::before {
  width: 44px;
  height: 44px;
  display: block;
  border-radius: 50%;
  background: var(--canvas);
  content: "";
}

.accuracy-ring strong {
  position: absolute;
  font-size: 11px;
}

.metric-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 18px 0 0;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--line);
  overflow: hidden;
}

.metric-list div {
  padding: 10px 6px;
  background: var(--surface-control);
  text-align: center;
}

.metric-list dt {
  color: var(--muted);
  font-size: 9px;
}

.metric-list dd {
  margin: 4px 0 0;
  font-size: 15px;
  font-weight: 800;
}

.type-progress {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.type-progress-item header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 10px;
}

.type-progress-item header strong {
  color: var(--ink);
  font-weight: 700;
}

.mini-track {
  height: 5px;
  overflow: hidden;
  border-radius: 3px;
  background: var(--ring-track);
}

.mini-track span {
  height: 100%;
  display: block;
  border-radius: inherit;
  background: var(--primary);
}

.map-legend {
  display: flex;
  gap: 12px;
  margin: 14px 0;
  color: var(--muted);
  font-size: 9px;
}

.map-legend span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.map-legend i {
  width: 7px;
  height: 7px;
  display: inline-block;
  border-radius: 2px;
  background: var(--line-strong);
}

.map-legend i.answered {
  background: var(--primary);
}

.map-legend i.wrong {
  background: var(--coral);
}

.map-legend i.current {
  border: 1px solid var(--primary);
  background: transparent;
}

.question-map {
  max-height: 300px;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 5px;
  overflow-y: auto;
  padding-right: 3px;
}

.map-button {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--muted);
  background: var(--surface-control);
  font-size: 8px;
}

.map-button.is-answered {
  border-color: var(--primary);
  color: var(--on-accent);
  background: var(--primary);
}

.map-button.is-wrong {
  border-color: var(--coral);
  color: var(--on-accent);
  background: var(--coral);
}

.map-button.is-current {
  box-shadow: 0 0 0 2px var(--canvas), 0 0 0 4px var(--primary);
}

.empty-view,
.exam-result-view {
  width: min(100%, 720px);
  margin: 0 auto;
  padding: 100px 24px;
  text-align: center;
}

.empty-symbol {
  width: 52px;
  height: 52px;
  display: grid;
  margin: 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: var(--canvas);
  font-size: 22px;
}

.empty-view h2 {
  margin: 18px 0 0;
  font-size: 18px;
}

.empty-view p {
  margin: 8px 0 24px;
  color: var(--muted);
  font-size: 12px;
}

.exam-score {
  font-size: 52px;
  font-weight: 800;
  color: var(--primary);
}

.exam-score small {
  color: var(--muted);
  font-size: 14px;
}

.result-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 26px 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.result-summary div {
  padding: 16px;
  background: var(--surface-control);
}

.result-summary strong,
.result-summary span {
  display: block;
}

.result-summary strong {
  font-size: 20px;
}

.result-summary span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.sidebar-scrim {
  display: none;
}

.modal-backdrop {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 18px;
  background: var(--modal-backdrop);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  width: min(100%, 420px);
  padding: 26px;
  border-radius: 7px;
  background: var(--surface-control);
  box-shadow: var(--shadow);
}

.modal h2 {
  margin: 6px 0 0;
  font-size: 20px;
}

.modal p:not(.eyebrow) {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

.toast {
  position: fixed;
  z-index: 120;
  right: 24px;
  bottom: 24px;
  max-width: min(360px, calc(100vw - 32px));
  padding: 11px 14px;
  border-radius: 5px;
  color: var(--on-accent);
  background: var(--charcoal);
  box-shadow: var(--shadow);
  font-size: 11px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr) 260px;
  }

  .question-view {
    padding-right: 32px;
    padding-left: 32px;
  }

  .question-map {
    grid-template-columns: repeat(7, 1fr);
  }
}

@media (max-width: 900px) {
  .topbar {
    grid-template-columns: 40px auto minmax(120px, 1fr) auto;
    gap: 10px;
    padding: 0 14px;
  }

  .mobile-only {
    display: inline-grid;
  }

  .brand small {
    display: none;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

  .sidebar {
    z-index: 70;
    top: 0;
    width: min(292px, calc(100vw - 48px));
    transform: translateX(-102%);
    transition: transform 180ms ease;
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-scrim.is-open {
    position: fixed;
    z-index: 60;
    inset: 0;
    display: block;
    background: var(--mobile-scrim);
  }

  .workspace {
    grid-template-columns: 1fr;
    margin-left: 0;
  }

  .insights-panel {
    position: fixed;
    z-index: 80;
    inset: auto 0 0;
    max-height: 75vh;
    display: none;
    overflow-y: auto;
    border-top: 1px solid var(--line);
    border-left: 0;
    background: var(--surface-control);
    box-shadow: var(--mobile-shadow);
  }

  .insights-panel.is-open {
    display: block;
  }

  .overview-section,
  .insights-panel .insight-section:nth-child(2) {
    display: none;
  }

  .mobile-close {
    display: inline-grid;
  }

  .question-map {
    max-height: 45vh;
    grid-template-columns: repeat(10, 1fr);
  }
}

@media (max-width: 640px) {
  :root {
    --topbar-height: 58px;
  }

  .topbar {
    grid-template-columns: 36px 34px minmax(0, 1fr) auto;
    gap: 8px;
  }

  .topbar-actions {
    gap: 4px;
  }

  .brand {
    width: 34px;
  }

  .brand > span:last-child {
    display: none;
  }

  .topbar-search {
    position: static;
    display: block;
    min-width: 0;
  }

  .search-field {
    height: 34px;
    padding: 0 9px;
  }

  .topbar .icon-button {
    width: 36px;
    height: 36px;
  }

  .session-bar {
    min-height: 72px;
    padding: 12px 18px;
  }

  .session-title-row {
    align-items: center;
    flex-direction: row;
    gap: 7px;
  }

  .session-title-row .small-button {
    position: static;
  }

  .session-actions {
    gap: 8px;
  }

  .question-view {
    padding: 26px 18px 28px;
  }

  .question-heading {
    align-items: flex-start;
  }

  .question-stem {
    margin: 20px 0;
    font-size: 18px;
    line-height: 1.65;
  }

  .option-button {
    grid-template-columns: 30px 1fr 18px;
    gap: 9px;
    padding: 9px 10px;
  }

  .analysis-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .source-list a {
    grid-template-columns: minmax(0, 1fr) 16px;
  }

  .source-domain {
    grid-column: 1 / -1;
  }

  .explanation {
    padding: 18px;
  }

  .question-footer {
    display: grid;
    grid-template-columns: auto 1fr;
  }

  .question-footer .primary-button {
    width: 100%;
  }

  .question-map {
    grid-template-columns: repeat(8, 1fr);
  }

  .toast {
    right: 16px;
    bottom: 16px;
    left: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}