:root {
  --bg: #f3f6fb;
  --panel: #ffffff;
  --panel-alt: #eef4ff;
  --text: #18212f;
  --muted: #607086;
  --line: #d7dfeb;
  --accent: #1565d8;
  --accent-soft: #dceafe;
  --success: #1d8a52;
  --danger: #c43d3d;
  --shadow: 0 18px 40px rgba(16, 30, 54, 0.08);
  --radius: 20px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top left, #f9fbff, var(--bg));
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  transition: grid-template-columns 180ms ease;
}

.app-shell.is-sidebar-collapsed {
  grid-template-columns: 76px minmax(0, 1fr);
}

.sidebar {
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  padding: 28px 20px;
}

.sidebar-toggle {
  position: absolute;
  top: 20px;
  right: 14px;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--accent);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 800;
  box-shadow: 0 8px 18px rgba(16, 30, 54, 0.08);
}

.sidebar-toggle:hover {
  background: var(--accent-soft);
}

.sidebar-toggle span {
  display: block;
  line-height: 1;
  transition: transform 180ms ease;
}

.app-shell.is-sidebar-collapsed .sidebar-toggle span {
  transform: rotate(180deg);
}

.brand {
  padding-right: 42px;
}

.brand h1,
.brand p,
.nav-links button {
  transition: opacity 160ms ease, color 160ms ease, background 160ms ease;
}

.app-shell.is-sidebar-collapsed .brand {
  padding-right: 0;
}

.app-shell.is-sidebar-collapsed .brand h1 {
  font-size: 0;
  margin: 0;
}

.app-shell.is-sidebar-collapsed .brand h1::before {
  content: "题";
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 20px;
}

.app-shell.is-sidebar-collapsed .brand p {
  display: none;
}

.nav-links {
  display: grid;
  gap: 10px;
  margin-top: 32px;
}

.sidebar-shortcuts {
  display: grid;
  gap: 8px;
  margin-top: 20px;
}

.sidebar-shortcuts a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-alt);
  color: var(--accent);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: background 160ms ease, border-color 160ms ease;
}

.sidebar-shortcuts a:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.sidebar-shortcuts a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.app-shell.is-sidebar-collapsed .sidebar-shortcuts a {
  justify-content: center;
  padding: 10px 0;
}

.app-shell.is-sidebar-collapsed .sidebar-shortcut-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.nav-links button {
  border: 0;
  border-radius: 14px;
  background: transparent;
  color: var(--text);
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  min-height: 44px;
  white-space: nowrap;
}

.nav-links button:hover,
.nav-links button.is-active {
  background: var(--accent-soft);
  color: var(--accent);
}

.app-shell.is-sidebar-collapsed .nav-links {
  margin-top: 26px;
}

.app-shell.is-sidebar-collapsed .nav-links button {
  display: grid;
  place-items: center;
  padding: 12px;
  font-size: 0;
}

.app-shell.is-sidebar-collapsed .nav-links button::before {
  content: attr(data-short);
  font-size: 1rem;
  font-weight: 800;
}

.content-area {
  padding: 28px;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(215, 223, 235, 0.7);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr;
  gap: 22px;
}

.hero-card,
.stats-card {
  padding: 28px;
}

.bank-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.hero-card h2 {
  margin: 8px 0 12px;
  font-size: 34px;
  line-height: 1.15;
}

.hero-copy {
  max-width: 52ch;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.primary-btn,
.secondary-btn {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
}

.primary-btn {
  background: var(--accent);
  color: #fff;
}

.secondary-btn {
  background: var(--accent-soft);
  color: var(--accent);
}

.primary-btn:disabled,
.secondary-btn:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.stat-row:last-child {
  border-bottom: 0;
}

.visual-entry-panel {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  margin-top: 20px;
  padding: 20px;
}

.visual-entry-panel h3,
.visual-entry-panel p {
  margin: 0;
}

.visual-entry-panel h3 {
  margin-top: 4px;
}

.visual-entry-panel p {
  color: var(--muted);
  line-height: 1.6;
}

.visual-entry-panel--compact {
  grid-template-columns: 190px minmax(0, 1fr);
  margin: 16px 0;
  border-radius: 14px;
  background: #fbfcff;
  box-shadow: none;
}

.visual-entry-panel--compact > div > strong {
  display: block;
  margin-bottom: 5px;
}

.visual-entry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px;
}

.visual-entry {
  display: grid;
  gap: 6px;
  min-height: 86px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  padding: 14px;
  text-decoration: none;
}

.visual-entry:hover {
  border-color: rgba(21, 101, 216, 0.45);
  background: var(--accent-soft);
}

.visual-entry strong {
  color: var(--accent);
}

.visual-entry span {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 20px;
}

.workspace-grid.is-practice-progress-collapsed {
  grid-template-columns: minmax(0, 1fr) 76px;
}

.learning-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 20px;
}

.learning-layout.is-learning-nav-collapsed {
  grid-template-columns: minmax(0, 1fr) 76px;
}

.question-panel,
.navigator-panel,
.learning-panel {
  padding: 24px;
}

.question-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
}

.learning-topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.learning-topbar .question-meta {
  flex: 1;
}

.question-stem {
  font-size: 27px;
  font-weight: 500;
  line-height: 1.45;
  margin: 18px 0 22px;
}

.learning-stem {
  font-size: 24px;
  font-weight: 500;
}

.practice-question-panel {
  font-family: Arial, Helvetica, sans-serif;
  --practice-font-scale: 0.82;
}

.practice-question-panel .question-stem {
  font-size: calc(27px * var(--practice-font-scale, 0.82));
}

.practice-topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.practice-topbar .question-meta {
  flex: 1;
}

.practice-favorite-btn {
  flex: 0 0 auto;
}

.practice-progress-panel {
  align-self: start;
  display: grid;
  gap: 16px;
  transition: padding 160ms ease;
}

.practice-progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.practice-progress-header h3 {
  margin: 0;
}

.practice-progress-compact {
  display: none;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  line-height: 1.2;
}

.practice-progress-toggle {
  border: 1px solid rgba(215, 223, 235, 0.95);
  border-radius: 999px;
  background: #fff;
  color: var(--accent);
  cursor: pointer;
  display: grid;
  flex: 0 0 auto;
  font-size: 19px;
  font-weight: 800;
  height: 34px;
  place-items: center;
  width: 34px;
}

.practice-progress-toggle:hover {
  background: var(--accent-soft);
  border-color: rgba(21, 101, 216, 0.45);
}

.practice-progress-toggle span {
  display: block;
  line-height: 1;
  transform: rotate(180deg);
  transition: transform 160ms ease;
}

.practice-progress-body {
  display: grid;
  gap: 12px;
}

.practice-progress-body p {
  line-height: 1.5;
  margin: 0;
}

.practice-source-link {
  border: 1px solid rgba(21, 101, 216, 0.22);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.86rem;
  font-weight: 820;
  line-height: 1.35;
  padding: 7px 10px;
  text-decoration: none;
}

.practice-source-link:hover {
  border-color: rgba(21, 101, 216, 0.42);
  text-decoration: underline;
}

.practice-progress-panel.is-collapsed {
  justify-self: end;
  gap: 0;
  padding: 14px 12px;
  width: 76px;
}

.practice-progress-panel.is-collapsed .practice-progress-header {
  display: grid;
  justify-items: center;
}

.practice-progress-panel.is-collapsed h3 {
  margin: 0;
  max-width: 2.5em;
  text-align: center;
  word-break: keep-all;
}

.practice-progress-panel.is-collapsed .practice-progress-compact {
  display: block;
  text-align: center;
}

.practice-progress-panel.is-collapsed .practice-progress-toggle {
  order: -1;
}

.practice-progress-panel.is-collapsed .practice-progress-toggle span {
  transform: rotate(0deg);
}

.question-jump-control {
  display: grid;
  gap: 8px;
}

.question-jump-control label {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.question-jump-control__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.question-jump-control input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  font: inherit;
  font-weight: 700;
  padding: 9px 10px;
}

.question-jump-control .secondary-btn {
  padding: 9px 12px;
}

.practice-font-control {
  display: grid;
  gap: 8px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
}

.practice-font-control__header,
.practice-font-control__ticks {
  align-items: center;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.practice-font-control label {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.practice-font-control strong {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 900;
}

.practice-font-control input[type="range"] {
  accent-color: var(--accent);
  width: 100%;
}

.practice-font-control__ticks {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.2;
}

.favorite-sync-panel {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.favorite-sync-panel__head {
  align-items: baseline;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

.favorite-sync-panel__head strong {
  font-weight: 850;
}

.favorite-sync-panel__head small {
  color: var(--muted);
  font-size: 0.82rem;
}

.favorite-sync-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.favorite-sync-panel__actions .secondary-btn {
  padding: 9px 11px;
}

.favorite-sync-panel textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
  line-height: 1.45;
  padding: 10px 11px;
  resize: vertical;
}

.favorite-sync-panel__output {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.8rem;
}

.favorite-sync-panel__input {
  min-height: 72px;
}

.favorite-sync-panel__message {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.favorite-sync-panel__message.is-success {
  color: var(--success);
}

.favorite-sync-panel__message.is-warning {
  color: var(--danger);
}

.question-panel .question-stem {
  font-weight: 500;
}

.practice-question-panel .question-stem {
  font-weight: 400;
}

.practice-answer-prompt {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: -8px 0 16px;
  color: #111827;
  font-size: 0.96rem;
}

.practice-answer-prompt strong {
  border: 1px solid rgba(21, 101, 216, 0.24);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 850;
  padding: 4px 9px;
}

.practice-answer-prompt.is-complete strong {
  border-color: rgba(13, 148, 136, 0.28);
  background: #e8fbf6;
  color: #0f766e;
}

.practice-answer-prompt span {
  line-height: 1.5;
}

.practice-study-strip {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  justify-content: space-between;
  margin: -10px 0 18px;
}

.practice-tags {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.practice-tags strong {
  color: var(--muted);
  font-size: 0.82rem;
}

.practice-tags a {
  border: 1px solid rgba(21, 101, 216, 0.24);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  padding: 5px 9px;
  text-decoration: none;
}

.practice-tags a:hover {
  border-color: rgba(21, 101, 216, 0.42);
  background: #edf5ff;
}

.practice-visual-link {
  border: 1px solid rgba(21, 101, 216, 0.28);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  padding: 6px 10px;
  text-decoration: none;
}

.practice-visual-link:hover {
  background: var(--accent-soft);
}

.learning-stem strong,
.learning-keypoint strong,
.learning-explanation strong {
  font-weight: 900;
}

.learning-stem strong {
  background: rgba(21, 101, 216, 0.12);
  border-radius: 6px;
  padding: 0 0.08em;
}

.favorite-btn {
  border: 1px solid rgba(215, 223, 235, 0.9);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  flex: 0 0 auto;
  font-weight: 700;
  padding: 10px 14px;
}

.favorite-btn span {
  margin-right: 4px;
}

.favorite-btn:hover,
.favorite-btn.is-active {
  border-color: rgba(21, 101, 216, 0.55);
  background: var(--accent-soft);
  color: var(--accent);
}

.learning-bank-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 4px;
}

.learning-bank-tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  font-weight: 700;
  padding: 10px 14px;
}

.learning-bank-tab:hover,
.learning-bank-tab.is-active {
  border-color: rgba(21, 101, 216, 0.55);
  background: var(--accent-soft);
  color: var(--accent);
}

.module-study {
  margin: 16px 0 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
}

.module-study__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
}

.module-study__header p {
  margin: 4px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.module-study__practice {
  flex: 0 0 auto;
}

.module-study__list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.module-study__item {
  min-height: 92px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  display: grid;
  align-content: start;
  gap: 5px;
  padding: 10px;
  text-align: left;
}

.module-study__item:hover,
.module-study__item.is-active {
  border-color: rgba(21, 101, 216, 0.55);
  background: var(--accent-soft);
}

.module-study__item:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.module-study__item span,
.module-study__item strong {
  font-weight: 800;
}

.module-study__item small {
  color: var(--muted);
  line-height: 1.35;
}

.learning-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: -8px 0 18px;
}

.learning-tags span {
  border: 1px solid rgba(21, 101, 216, 0.24);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  padding: 5px 9px;
}

.learning-keypoint {
  margin: 0 0 20px;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: var(--panel-alt);
}

.learning-speed-tip,
.learning-study-note {
  margin: 0 0 20px;
  padding: 14px 16px;
  border-radius: 12px;
  background: #fbfcff;
  border: 1px solid var(--line);
}

.learning-speed-tip {
  border-color: rgba(29, 138, 82, 0.26);
  background: #f2fbf6;
}

.learning-keypoint > strong,
.learning-speed-tip > strong,
.learning-study-note > strong {
  display: block;
  margin-bottom: 8px;
}

.learning-keypoint p,
.learning-speed-tip p {
  margin: 0;
  line-height: 1.7;
}

.learning-study-note ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  line-height: 1.7;
}

.learning-discussion {
  margin: 0 0 20px;
  padding: 14px 16px;
  border: 1px solid rgba(111, 66, 193, 0.26);
  border-radius: 12px;
  background: #faf7ff;
}

.learning-discussion__header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.learning-discussion__header span,
.learning-discussion__votes span,
.learning-discussion blockquote em {
  border-radius: 999px;
  background: #f1eafe;
  color: #6334ad;
  font-size: 0.78rem;
  font-style: normal;
  font-weight: 800;
  padding: 4px 8px;
}

.learning-discussion__votes {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.learning-discussion > p,
.learning-discussion blockquote p {
  margin: 10px 0 0;
  line-height: 1.7;
}

.learning-discussion details {
  margin-top: 12px;
}

.learning-discussion summary {
  color: #6334ad;
  cursor: pointer;
  font-weight: 800;
}

.learning-discussion__highlights {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.learning-discussion blockquote {
  margin: 0;
  padding: 10px 12px;
  border-left: 3px solid #8b5fc4;
  border-radius: 8px;
  background: #fff;
}

.learning-discussion blockquote em {
  margin-left: 6px;
}

.learning-option-list {
  display: grid;
  gap: 14px;
}

.learning-option {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
}

.learning-option.is-correct {
  border-color: rgba(29, 138, 82, 0.45);
  background: #f2fbf6;
}

.learning-option__choice {
  display: flex;
  gap: 10px;
  line-height: 1.6;
}

.learning-explanation {
  margin: 12px 0 0;
  line-height: 1.75;
}

.learning-explanation.is-correct {
  color: #111827;
  font-size: 1.08rem;
}

.learning-explanation.is-wrong {
  color: #111827;
}

.learning-nav p {
  color: var(--muted);
  line-height: 1.7;
}

.learning-nav {
  align-self: start;
  display: grid;
  gap: 12px;
  transition: padding 160ms ease;
}

.learning-nav__header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.learning-nav__header h3 {
  margin: 0 0 12px;
}

.learning-nav__compact {
  display: none;
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  line-height: 1.2;
}

.learning-nav-toggle {
  border: 1px solid rgba(215, 223, 235, 0.95);
  border-radius: 999px;
  background: #fff;
  color: var(--accent);
  cursor: pointer;
  display: grid;
  flex: 0 0 auto;
  font-size: 19px;
  font-weight: 800;
  height: 34px;
  place-items: center;
  width: 34px;
}

.learning-nav-toggle:hover {
  background: var(--accent-soft);
  border-color: rgba(21, 101, 216, 0.45);
}

.learning-nav-toggle span {
  display: block;
  line-height: 1;
  transform: rotate(180deg);
  transition: transform 160ms ease;
}

.learning-nav__body {
  display: grid;
  gap: 12px;
}

.learning-nav__body p {
  margin: 0;
}

.learning-nav__favorite-entry {
  justify-self: start;
}

.learning-nav.is-collapsed {
  justify-self: end;
  padding: 14px 12px;
  width: 76px;
}

.learning-nav.is-collapsed .learning-nav__header {
  display: grid;
  justify-items: center;
}

.learning-nav.is-collapsed h3 {
  margin: 0;
  max-width: 2.5em;
  text-align: center;
  word-break: keep-all;
}

.learning-nav.is-collapsed .learning-nav__compact {
  display: block;
  margin-top: 8px;
  text-align: center;
}

.learning-nav.is-collapsed .learning-nav-toggle {
  order: -1;
}

.learning-nav.is-collapsed .learning-nav-toggle span {
  transform: rotate(0deg);
}

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

.practice-question-panel .option-list {
  align-items: stretch;
  grid-template-columns: 1fr;
}

.option-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fbfcff;
}

.practice-question-panel .option-item {
  min-height: 74px;
}

.question-panel .option-item span {
  font-weight: 400;
}

.practice-question-panel .option-item span {
  font-size: calc(1rem * var(--practice-font-scale, 0.82));
  font-weight: 400;
  line-height: 1.48;
}

.practice-question-panel .practice-answer-prompt,
.practice-question-panel .practice-study-strip,
.practice-question-panel .feedback,
.practice-question-panel .practice-option-explanations,
.practice-question-panel .practice-exam-decision,
.practice-question-panel .practice-mistake-reason,
.practice-question-panel .practice-learning-summary,
.practice-question-panel .question-analysis {
  font-size: calc(1rem * var(--practice-font-scale, 0.82));
}

.toolbar {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.feedback {
  margin-top: 20px;
  padding: 16px 18px;
  border-radius: 16px;
}

.feedback.is-correct {
  background: #e8f7ef;
  color: var(--success);
}

.feedback.is-wrong {
  background: #feefef;
  color: var(--danger);
}

.feedback p {
  margin: 8px 0 0;
}

.feedback-explanation {
  color: var(--text);
  line-height: 1.7;
}

.practice-exam-decision {
  margin-top: 12px;
  padding: 14px 16px;
  border: 1px solid rgba(21, 101, 216, 0.18);
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  background: #fff;
}

.practice-exam-decision.is-correct {
  border-left-color: var(--success);
  background: #f6fcf8;
}

.practice-exam-decision.is-wrong {
  border-left-color: var(--danger);
  background: #fff8f8;
}

.practice-exam-decision strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
  font-weight: 900;
}

.practice-exam-decision p {
  margin: 0;
  color: #111827;
  line-height: 1.7;
}

.practice-exam-decision__link {
  display: inline-flex;
  margin-top: 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 850;
  padding: 7px 10px;
  text-decoration: none;
}

.practice-exam-decision__link:hover {
  text-decoration: underline;
}

.practice-exam-decision__review {
  align-items: center;
  color: var(--muted);
  display: inline-flex;
  flex-wrap: wrap;
  font-size: 0.86rem;
  gap: 6px;
  margin: 10px 0 0 10px;
}

.practice-exam-decision__review strong {
  color: var(--text);
  display: inline;
  font-size: inherit;
  margin: 0;
}

.practice-mistake-reason {
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(177, 48, 48, 0.18);
  border-radius: 12px;
  background: #fffafa;
  display: grid;
  gap: 6px;
}

.practice-mistake-reason strong {
  color: var(--danger);
  font-size: 0.94rem;
  font-weight: 900;
}

.practice-mistake-reason p,
.practice-mistake-reason span,
.practice-mistake-reason small {
  margin: 0;
  color: #111827;
  line-height: 1.55;
}

.practice-mistake-reason small {
  color: var(--muted);
  font-size: 0.88rem;
}

.practice-learning-summary {
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid rgba(21, 101, 216, 0.18);
  border-radius: 14px;
  background: #f8fbff;
  display: grid;
  gap: 12px;
}

.practice-learning-summary__item > strong {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
  font-size: 0.94rem;
  font-weight: 900;
}

.practice-learning-summary__item p {
  margin: 0;
  color: #111827;
  line-height: 1.7;
}

.practice-learning-summary__item ul {
  margin: 0;
  padding-left: 20px;
  color: #111827;
  display: grid;
  gap: 8px;
  line-height: 1.65;
}

.practice-learning-summary strong {
  font-weight: 900;
}

.practice-next-review {
  align-items: center;
  background: #fff;
  border: 1px solid rgba(21, 101, 216, 0.14);
  border-radius: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  padding: 10px 12px;
}

.practice-next-review > strong {
  margin: 0;
}

.practice-next-review__button {
  padding: 9px 12px;
}

.practice-module-snapshot {
  display: grid;
  gap: 10px;
}

.practice-module-snapshot__group {
  border: 1px solid rgba(21, 101, 216, 0.14);
  border-radius: 12px;
  background: #fff;
  padding: 10px 12px;
}

.practice-module-snapshot__head {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  justify-content: space-between;
  margin-bottom: 8px;
}

.practice-module-snapshot__head a,
.practice-module-snapshot li a {
  color: var(--accent);
  font-weight: 850;
  text-decoration: none;
}

.practice-module-snapshot__head a:hover,
.practice-module-snapshot li a:hover {
  text-decoration: underline;
}

.practice-module-snapshot__head span {
  border-radius: 999px;
  background: rgba(21, 101, 216, 0.11);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 850;
  padding: 3px 8px;
}

.practice-symptom-guide ul {
  padding-left: 0;
  list-style: none;
}

.practice-symptom-guide li {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.practice-symptom-guide a {
  color: #111827;
  font-weight: 800;
  text-decoration: none;
}

.practice-symptom-guide a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.practice-symptom-guide em {
  color: var(--muted);
  font-style: normal;
  font-weight: 800;
}

.practice-symptom-guide small {
  border-radius: 999px;
  background: rgba(21, 101, 216, 0.11);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 3px 7px;
}

.practice-symptom-guide__priority {
  border-radius: 999px;
  background: rgba(220, 38, 38, 0.08);
  color: #b91c1c;
  font-size: 0.78rem;
  font-weight: 900;
  padding: 3px 8px;
  text-decoration: none;
}

.practice-symptom-guide__priority:hover {
  text-decoration: underline;
}

.practice-symptom-guide__practice {
  border: 0;
  border-radius: 999px;
  background: var(--success-soft);
  color: var(--success);
  cursor: pointer;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 850;
  padding: 4px 8px;
}

.practice-symptom-guide__practice:hover {
  text-decoration: underline;
}

.practice-symptom-guide__evidence {
  flex: 1 0 100%;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.45;
}

.practice-module-guide a {
  color: var(--accent);
  font-weight: 900;
  text-decoration: none;
}

.practice-module-guide a:hover {
  text-decoration: underline;
}

.practice-confusion-guide ul {
  list-style: none;
  padding-left: 0;
}

.practice-confusion-guide li {
  border: 1px solid rgba(215, 223, 235, 0.9);
  border-radius: 10px;
  background: #fff;
  display: grid;
  gap: 5px;
  padding: 10px 12px;
}

.practice-confusion-guide a {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 850;
  text-decoration: none;
}

.practice-confusion-guide a:hover {
  text-decoration: underline;
}

.practice-confusion-guide strong {
  color: #111827;
}

.practice-confusion-guide em {
  color: var(--muted);
  font-style: normal;
  line-height: 1.55;
}

.practice-option-explanations {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.practice-option-explanations > strong {
  display: block;
}

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

.practice-option {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
}

.practice-option.is-correct {
  border-color: rgba(29, 138, 82, 0.45);
  background: #f2fbf6;
}

.practice-option.is-selected:not(.is-correct) {
  border-color: rgba(177, 48, 48, 0.35);
  background: #fff8f8;
}

.practice-option__choice {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  line-height: 1.6;
}

.practice-option__choice strong,
.practice-option__explanation strong {
  font-weight: 800;
}

.practice-option__choice em {
  border-radius: 999px;
  background: rgba(29, 138, 82, 0.12);
  color: var(--success);
  font-size: 0.82rem;
  font-style: normal;
  font-weight: 700;
  padding: 3px 8px;
}

.practice-option__choice .is-selected-badge {
  background: rgba(21, 101, 216, 0.12);
  color: var(--accent);
}

.practice-option__explanation {
  margin: 10px 0 0;
  color: #111827;
  line-height: 1.75;
}

.question-analysis {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

.analysis-section {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--panel-alt);
}

.analysis-section strong {
  display: block;
  margin-bottom: 8px;
}

.analysis-section p,
.analysis-section ul {
  margin: 0;
  color: var(--text);
  line-height: 1.7;
}

.analysis-section ul {
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.analysis-section li span {
  font-weight: 600;
}

.results-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
}

.results-summary,
.wrong-list {
  padding: 24px;
}

.results-summary p,
.wrong-list li,
.exam-nav p {
  color: var(--muted);
}

.mistakes-layout {
  display: grid;
  gap: 20px;
}

.mistakes-summary,
.mistakes-empty,
.archive-panel {
  padding: 24px;
}

.mistake-list {
  display: grid;
  gap: 16px;
}

.mistake-card {
  padding: 24px;
}

.mistake-card__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
}

.mistake-card__stem {
  margin: 14px 0 10px;
  font-size: 22px;
  line-height: 1.4;
}

.mistake-card__type {
  margin: 0 0 16px;
  color: var(--muted);
}

.mistake-card__answers strong {
  display: block;
  margin-bottom: 8px;
}

.mistake-card__answers ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  color: var(--muted);
}

.mistake-learning-summary {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 12px;
  background: #f8fbff;
  display: grid;
  gap: 12px;
}

.mistake-learning-summary__item > strong {
  display: block;
  margin-bottom: 6px;
  color: #0f172a;
  font-size: 0.94rem;
}

.mistake-learning-summary__item p {
  margin: 0;
  color: #111827;
  line-height: 1.7;
}

.mistake-learning-summary__item ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
  color: #111827;
  line-height: 1.65;
}

.mistake-learning-summary strong {
  font-weight: 900;
}

.mistake-card__options {
  margin-top: 18px;
}

.mistake-card__options > strong {
  display: block;
  margin-bottom: 10px;
}

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

.mistake-option {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fbfcff;
}

.mistake-option.is-correct {
  border-color: rgba(29, 138, 82, 0.45);
  background: #f2fbf6;
}

.mistake-option__choice {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: baseline;
  line-height: 1.6;
}

.mistake-option__choice strong,
.mistake-option__explanation strong {
  font-weight: 900;
}

.mistake-option__choice em {
  border-radius: 999px;
  background: rgba(29, 138, 82, 0.12);
  color: var(--success);
  font-size: 0.82rem;
  font-style: normal;
  font-weight: 800;
  padding: 3px 8px;
}

.mistake-option__explanation {
  margin: 10px 0 0;
  color: #111827;
  line-height: 1.75;
}

.mistake-option.is-correct .mistake-option__explanation {
  font-size: 1.05rem;
}

.mistake-card__explanation {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--panel-alt);
}

.mistake-card__explanation strong {
  display: block;
  margin-bottom: 8px;
}

.mistake-card__explanation p {
  margin: 0;
  color: var(--text);
  line-height: 1.7;
}

.archive-panel {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
}

.archive-panel h3 {
  margin: 6px 0 12px;
}

.archive-status,
.archive-meta {
  margin: 8px 0 0;
  color: var(--muted);
}

.wrong-list ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
}

.wrong-list li p {
  margin: 8px 0 0;
  line-height: 1.7;
}

@media (orientation: landscape) and (max-height: 620px) {
  .content-area {
    padding: 16px;
  }

  .question-panel,
  .navigator-panel,
  .learning-panel {
    padding: 18px;
  }

  .practice-question-panel .question-stem {
    font-size: 22px;
    line-height: 1.34;
    margin: 12px 0 16px;
  }

  .practice-question-panel .option-list {
    gap: 10px;
  }

  .practice-question-panel .option-item {
    min-height: 62px;
    padding: 12px 14px;
  }

  .practice-answer-prompt,
  .practice-study-strip {
    margin-bottom: 12px;
  }

  .toolbar {
    margin-top: 14px;
  }

  .feedback {
    margin-top: 14px;
    padding: 12px 14px;
  }
}

@media (max-width: 960px) {
  .app-shell,
  .hero-grid,
  .workspace-grid,
  .workspace-grid.is-practice-progress-collapsed,
  .learning-layout,
  .results-layout,
  .visual-entry-panel,
  .visual-entry-panel--compact {
    grid-template-columns: 1fr;
  }

  .visual-entry-grid {
    grid-template-columns: 1fr;
  }

  .module-study__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .module-study__header {
    align-items: stretch;
    flex-direction: column;
  }

  .learning-layout.is-learning-nav-collapsed {
    grid-template-columns: 1fr;
  }

  .app-shell.is-sidebar-collapsed {
    grid-template-columns: 1fr;
  }

  .app-shell.is-sidebar-collapsed .sidebar {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
    align-items: center;
  }

  .app-shell.is-sidebar-collapsed .nav-links {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin-top: 0;
  }
}

/* Bilingual AI annotations keep English source and Chinese translations visible. */
.ai-study-links{margin:20px 0;padding:18px;border:1px solid #cbd5e1;border-radius:12px;background:#f8fafc;font-size:14px}.ai-study-links dl{display:flex;flex-wrap:wrap;gap:12px 24px;margin:14px 0}.ai-study-links dl div{min-width:120px}.ai-study-links dt{font-weight:600}.ai-study-links dd{margin:4px 0;color:#475569}.ai-study-links a{color:#1d4ed8;text-decoration:underline;text-underline-offset:3px}.ai-study-links .toolbar{flex-wrap:wrap;gap:12px 24px}.practice-exam-decision p{white-space:pre-line}
.ai-stem-translation,.ai-option-translation{display:block;font-weight:400;font-size:.92em;line-height:1.7;margin-top:.55em;color:#475569}.ai-english{display:inline-block;margin-top:.35em;font-size:.94em}.ai-sources{margin-top:20px;padding:15px;border:1px solid #cbd5e1;border-radius:10px;font-size:12px;line-height:1.7}.ai-sources a{color:#1d4ed8;text-decoration:underline}.ai-sources p{margin:6px 0}.question-analysis p,.question-analysis li{white-space:pre-line}