:root {
  /* MTI Daily 深色闯关（对齐 Issue 色板，无 Tailwind） */
  --color-bg-top: #0d0d1a;
  --color-bg-bottom: #1a1a2e;
  --color-bg: #12121f;
  --color-surface: #252542;
  --color-surface-muted: #1e1e36;
  --color-border: #3d3d5c;
  --color-text: #ececf4;
  --color-text-muted: #9898b8;
  --color-primary: #0984e3;
  --color-primary-strong: #0670c2;
  --color-secondary: #a8a8c8;
  --color-accent-blue: #0984e3;
  --color-accent-green: #00b894;
  --color-streak: #fdcb6e;
  --color-passage-bar: #0984e3;
  --color-passage-bg: #1a1a32;
  --color-success-bg: rgba(0, 184, 148, 0.12);
  --color-success-text: #55efc4;
  --color-success-border: #00b894;
  --color-warning-bg: rgba(225, 112, 85, 0.12);
  --color-warning-text: #fab1a0;
  --color-warning-border: #e17055;
  --color-locked: #4a4a6a;
  --color-nav-active: #0984e3;

  --font-family-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-md: 14px;
  --font-size-lg: 15px;
  --font-size-xl: 16px;
  --line-height-tight: 1.45;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.7;

  --space-1: 6px;
  --space-2: 8px;
  --space-3: 10px;
  --space-4: 12px;
  --space-5: 16px;

  --radius-sm: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35);
  --duration-fast: 140ms;
  --duration-normal: 220ms;
  --easing-standard: ease;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: linear-gradient(180deg, var(--color-bg-top) 0%, var(--color-bg-bottom) 100%);
  background-attachment: fixed;
  color: var(--color-text);
  font-family: var(--font-family-ui);
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 16px 16px calc(88px + env(safe-area-inset-bottom));
}

/* ── App shell ── */
.app-shell {
  min-height: 100vh;
  background: transparent;
}

.page-main {
  padding-bottom: 8px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px;
  margin: 0 -16px 12px;
  background: rgba(26, 26, 46, 0.92);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.topbar-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
  cursor: pointer;
}

.topbar-icon-btn:hover {
  color: var(--color-text);
  border-color: var(--color-accent-blue);
}

.icon-svg {
  display: block;
}

.streak-inline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.streak-inline .flame-svg {
  flex-shrink: 0;
  color: var(--color-streak);
}

.streak-unit {
  font-weight: 500;
  opacity: 0.85;
}

.topbar-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.streak {
  font-size: 14px;
  color: var(--color-secondary);
}

.streak strong {
  color: var(--color-streak);
}

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

.topbar-search {
  width: 120px;
  max-width: 36vw;
  padding: 8px 10px;
  font-size: 13px;
}

.btn-text {
  background: transparent !important;
  color: var(--color-secondary) !important;
  padding: 8px 10px !important;
  font-weight: 500 !important;
  border-radius: 8px !important;
}

.btn-text:hover {
  background: rgba(9, 132, 227, 0.12) !important;
  color: var(--color-text) !important;
}

.topbar-user {
  font-size: 13px;
  color: var(--color-text-muted);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

body.immersive-mode .topbar {
  padding: 8px 10px;
  margin-bottom: 6px;
  min-height: 44px;
  transition: opacity 180ms ease, transform 180ms ease, background 180ms ease;
}

body.immersive-mode .topbar-actions .topbar-icon-btn,
body.immersive-mode .topbar-actions .topbar-search,
body.immersive-mode .topbar-actions #btnForceFrontendReload,
body.immersive-mode .topbar-actions #userInfo,
body.immersive-mode .topbar-actions #btnLogout {
  display: none !important;
}

body.immersive-mode .topbar-right {
  gap: 0;
}

body.immersive-mode .topbar-title {
  font-size: 17px;
}

body.immersive-mode.immersive-scrolled .topbar {
  opacity: 0.18;
  transform: translateY(-8px);
  pointer-events: none;
  background: transparent;
  border-bottom-color: transparent;
}

.section-title--inline {
  margin-top: 16px;
  margin-bottom: 10px;
}

.home-welcome {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.today-header {
  text-align: center;
  padding: 24px 18px 22px;
}

.map-progress-track {
  display: flex;
  gap: 8px;
  margin: 0 auto 10px;
  max-width: 100%;
}

.map-seg {
  flex: 1;
  min-width: 0;
  border-radius: var(--radius-md);
  padding: 10px 8px;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.map-seg--done {
  border-color: var(--color-success-border);
  background: var(--color-success-bg);
  color: var(--color-success-text);
}

.map-seg--active {
  border-color: var(--color-accent-blue);
  background: rgba(9, 132, 227, 0.15);
  color: #74b9ff;
}

.map-seg--locked {
  opacity: 0.55;
  border-color: var(--color-locked);
  color: var(--color-locked);
}

.map-seg__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 22px;
}

.map-progress-caption {
  margin-bottom: 16px;
}

.level-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 8px;
}

.level-card {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  text-align: left;
  padding: 16px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: inherit;
  font: inherit;
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: border-color var(--duration-fast), transform var(--duration-fast);
}

.level-card:hover:not(:disabled) {
  border-color: var(--color-accent-blue);
}

.level-card:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.level-card--active {
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 0 1px var(--color-accent-blue), var(--shadow-card);
}

.level-card--done {
  border-color: var(--color-success-border);
}

.level-card--locked {
  border-color: var(--color-locked);
  opacity: 0.65;
}

.level-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-surface-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.level-card--active .level-card__icon {
  color: var(--color-accent-blue);
}

.level-card--done .level-card__icon {
  color: var(--color-accent-green);
}

.level-card__body {
  flex: 1;
  min-width: 0;
}

.level-card__title {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.level-card__desc {
  display: block;
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.level-card__badge {
  font-size: 12px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.stats-grid--compact {
  margin: 16px 0 12px;
}

.stats-grid--compact .stat-item {
  padding: 12px 8px;
}

.extra-board-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

.extra-board-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  width: 100%;
  padding: 18px 16px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  font: inherit;
  transition: border-color var(--duration-fast);
}

.extra-board-card:hover {
  border-color: var(--color-accent-blue);
}

.extra-board-card__icon {
  color: var(--color-accent-blue);
  margin-bottom: 4px;
}

.extra-board-card__title {
  font-size: 16px;
  font-weight: 600;
}

.extra-board-card__sub {
  font-size: 13px;
  color: var(--color-text-muted);
}

.extra-board-card--placeholder {
  cursor: default;
  opacity: 0.65;
  border-style: dashed;
}

.stats-dash-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 12px 0 16px;
}

.stat-dash-card {
  padding: 14px 12px;
  border-radius: var(--radius-md);
  text-align: center;
}

.stat-dash-card__label {
  font-size: 11px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-dash-card__value {
  font-size: 20px;
  font-weight: 700;
  margin-top: 8px;
  color: var(--color-text);
}

.week-chart {
  padding: 16px;
  border-radius: var(--radius-lg);
  margin-bottom: 14px;
}

.week-chart__title {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.week-chart__bars {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 6px;
  height: 100px;
  padding-top: 8px;
}

.week-chart__bar {
  flex: 1;
  min-width: 0;
  background: linear-gradient(180deg, var(--color-accent-blue), rgba(9, 132, 227, 0.35));
  border-radius: 4px 4px 0 0;
  opacity: 0.85;
}

.settings-fold {
  padding: 0;
  overflow: hidden;
}

.settings-fold__summary {
  padding: 14px 16px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.settings-fold__summary::-webkit-details-marker {
  display: none;
}

.settings-fold__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--color-border);
}

.translation-progress-host {
  margin-top: 10px;
}

.translation-progress-dots {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.translation-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
}

.translation-dot--done {
  background: var(--color-accent-green);
}

.translation-dot--current {
  background: var(--color-accent-blue);
  box-shadow: 0 0 0 2px rgba(9, 132, 227, 0.35);
}

.reading-remediation-branch {
  margin-top: 14px;
  padding: 14px;
  border-radius: var(--radius-md);
  border: 1px dashed var(--color-border);
  background: var(--color-surface-muted);
}

.reading-remediation-branch textarea {
  width: 100%;
  margin-top: 10px;
  min-height: 80px;
}

label.answer-option.is-correct {
  border-color: var(--color-success-border) !important;
  background: var(--color-success-bg) !important;
}

label.answer-option.is-wrong {
  border-color: var(--color-warning-border) !important;
  background: var(--color-warning-bg) !important;
}

label.answer-option.is-correct .answer-option-letter {
  background: var(--color-accent-green) !important;
  border-color: var(--color-accent-green) !important;
  color: #fff !important;
}

label.answer-option.is-wrong .answer-option-letter {
  background: var(--color-warning-border) !important;
  border-color: var(--color-warning-border) !important;
  color: #fff !important;
}

.today-date {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.today-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-text);
}

.today-progress {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.progress-dots {
  display: flex;
  gap: 6px;
}

.progress-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #e5e5e5;
}

.progress-dot.done {
  background: var(--color-accent-green);
}

.progress-dot.current {
  background: var(--color-accent-blue);
}

.progress-text {
  font-size: 14px;
  color: var(--color-secondary);
}

.btn-primary {
  display: block;
  width: 100%;
  max-width: 280px;
  margin: 0 auto;
  padding: 16px 24px !important;
  background: var(--color-primary) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 8px !important;
  font-size: 16px !important;
  font-weight: 500 !important;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(9, 132, 227, 0.35);
}

.btn-primary:hover {
  background: var(--color-primary-strong) !important;
}

.btn-secondary {
  background: var(--color-surface-muted) !important;
  color: var(--color-text) !important;
  border: 1px solid var(--color-border) !important;
}

.btn-secondary:hover {
  border-color: var(--color-accent-blue) !important;
  color: var(--color-text) !important;
}

.input-dark,
.card-dark input,
.card-dark textarea,
.card-dark select {
  background: var(--color-surface-muted);
  border-color: var(--color-border);
  color: var(--color-text);
}

.card-dark {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
}

.btn-primary:active {
  transform: scale(0.98);
}

.section-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin: 20px 0 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-section-heading {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.module-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module-item {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 20px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: background 0.2s;
  border: none;
  width: 100%;
  text-align: left;
  box-shadow: var(--shadow-card);
  color: inherit;
  font: inherit;
}

.module-item:hover {
  background: #fafafa;
}

.module-item:active {
  background: #f0f0f0;
}

.module-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

.module-item.reading .module-icon {
  background: #e3f2fd;
}

.module-item.translation .module-icon {
  background: #fff3e0;
}

.module-item.grammar .module-icon {
  background: #e8f5e9;
}

.module-item.memory .module-icon {
  background: #f3e5f5;
}

.module-info {
  flex: 1;
  min-width: 0;
}

.module-info h3 {
  font-size: 16px;
  font-weight: 500;
  margin: 0 0 2px;
  color: var(--color-text);
}

.module-info p {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}

.module-status {
  font-size: 13px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.module-status .num {
  font-weight: 600;
  color: var(--color-text);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0 8px;
}

@media (min-width: 520px) {
  .stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.stat-item {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 18px 12px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.stat-value {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
}

.stat-label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.login-card {
  margin-top: 48px;
}

.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  justify-content: space-around;
  align-items: stretch;
  max-width: 480px;
  margin: 0 auto;
  padding: 6px 4px calc(8px + env(safe-area-inset-bottom));
  background: rgba(30, 30, 54, 0.96);
  border-top: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
}

.bottom-nav .nav-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex: 1;
  min-width: 0;
  color: var(--color-text-muted);
  font-size: 10px;
  font-weight: 500;
  background: none !important;
  border: none !important;
  padding: 8px 6px 10px !important;
  cursor: pointer;
  border-radius: 8px !important;
}

.bottom-nav .nav-item .nav-icon {
  display: block;
  stroke: currentColor;
}

.bottom-nav .nav-item.active {
  color: var(--color-nav-active);
  background: transparent !important;
}

.bottom-nav .nav-item.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-nav-active);
}

.feed-shell {
  min-height: calc(100dvh - 150px);
  display: grid;
  grid-template-rows: auto 1fr;
}

body.immersive-feed #feedCard {
  border: none;
  background: transparent;
  box-shadow: none;
  padding: 0;
}

body.immersive-feed {
  overflow: hidden;
}

body.immersive-feed .feed-shell__head {
  margin-bottom: 6px;
}

body.immersive-feed .feed-viewport {
  min-height: calc(100dvh - 170px);
}

body.immersive-feed .container {
  max-width: 100%;
  padding-left: 10px;
  padding-right: 10px;
}

.feed-shell__head {
  margin-bottom: 10px;
}

.feed-viewport {
  position: relative;
  overflow: hidden;
  min-height: min(84dvh, 820px);
  display: grid;
}

.feed-guide-overlay {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: grid;
  place-items: center;
  background: rgba(7, 14, 34, 0.62);
  backdrop-filter: blur(2px);
}

.feed-guide-overlay__panel {
  width: min(92%, 320px);
  border-radius: 14px;
  border: 1px solid rgba(116, 185, 255, 0.3);
  background: linear-gradient(180deg, rgba(26, 42, 73, 0.96), rgba(18, 31, 58, 0.96));
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.42);
  padding: 14px 14px 12px;
  color: #d9ebff;
}

.feed-guide-overlay__title {
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feed-guide-overlay__line {
  font-size: 12px;
  line-height: 1.5;
  margin-bottom: 3px;
}

.feed-guide-overlay__hint {
  margin-top: 8px;
  font-size: 11px;
  color: #aac9ef;
}

.feed-card-stage {
  border: 1px solid rgba(116, 185, 255, 0.28);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(25, 40, 68, 0.86), rgba(20, 31, 55, 0.92));
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
  padding: 18px 16px 14px;
  min-height: min(84dvh, 820px);
  display: grid;
  grid-template-rows: auto auto 1fr auto auto auto;
  gap: 12px;
  touch-action: none;
}

.feed-card-stack {
  position: relative;
  min-height: min(84dvh, 820px);
}

.feed-card-back {
  position: absolute;
  left: 10px;
  right: 10px;
  border-radius: 14px;
  border: 1px solid rgba(116, 185, 255, 0.12);
  background: linear-gradient(180deg, rgba(20, 34, 59, 0.72), rgba(16, 28, 49, 0.78));
  pointer-events: none;
  transition: transform 180ms ease, opacity 180ms ease;
}

.feed-card-back--1 {
  top: 8px;
  bottom: -8px;
  opacity: 0.58;
}

.feed-card-back--2 {
  left: 18px;
  right: 18px;
  top: 16px;
  bottom: -16px;
  opacity: 0.38;
}

.feed-card-stack.is-advance .feed-card-back--1 {
  animation: feedBackLift1 210ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.feed-card-stack.is-advance .feed-card-back--2 {
  animation: feedBackLift2 210ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.feed-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.feed-gesture-guide {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.feed-gesture-guide__left,
.feed-gesture-guide__up,
.feed-gesture-guide__right {
  border-radius: 999px;
  text-align: center;
  font-size: 11px;
  line-height: 1.2;
  padding: 5px 8px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.03);
  color: #d7e8ff;
}

.feed-gesture-guide__left {
  border-color: rgba(255, 107, 107, 0.28);
  color: #ffb5b5;
}

.feed-gesture-guide__up {
  border-color: rgba(116, 185, 255, 0.32);
  color: #b9ddff;
}

.feed-gesture-guide__right {
  border-color: rgba(46, 213, 115, 0.3);
  color: #b9ffd4;
}

.feed-chip {
  display: inline-block;
  max-width: 72%;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(116, 185, 255, 0.3);
  background: rgba(116, 185, 255, 0.1);
  color: #a8d8ff;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.feed-main-text {
  font-size: clamp(26px, 4.8vw, 40px);
  line-height: 1.48;
  font-weight: 700;
  color: #f5f8ff;
  letter-spacing: 0.1px;
}

.feed-main-text-cn {
  font-size: clamp(16px, 2.8vw, 22px);
  line-height: 1.7;
  color: #d8e6ff;
  border-left: 3px solid rgba(85, 239, 196, 0.35);
  background: rgba(255, 255, 255, 0.03);
  padding: 10px 12px;
  border-radius: 10px;
}

.feed-main-text-cn--placeholder {
  color: #9fb0ca;
  border-left-color: rgba(159, 176, 202, 0.35);
}

.feed-sub-text {
  margin-top: 4px;
  font-size: 13px;
  color: #c5d8f8;
  line-height: 1.6;
  border-left: 2px solid rgba(116, 185, 255, 0.35);
  padding-left: 8px;
}

.feed-insight {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.feed-insight__summary {
  list-style: none;
  cursor: pointer;
  padding: 8px 12px;
  font-size: 12px;
  color: #c7ddff;
}

.feed-insight__summary::-webkit-details-marker {
  display: none;
}

.feed-insight__body {
  padding: 0 12px 10px;
}

.feed-actions {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.feed-hint {
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  opacity: 0.82;
}

.feed-gesture-status {
  text-align: center;
  font-size: 12px;
  color: #cbe0ff;
  min-height: 18px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 120ms ease, transform 120ms ease;
}

.feed-gesture-status.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.feed-card-stage {
  position: relative;
  z-index: 2;
  transition: transform 120ms ease, box-shadow 120ms ease, border-color 120ms ease;
  will-change: transform;
}

.feed-card-stage.feed-enter-from-up {
  animation: feedEnterFromUp 220ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.feed-card-stage.feed-enter-from-down {
  animation: feedEnterFromDown 220ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.feed-card-stage.feed-enter-from-left {
  animation: feedEnterFromLeft 220ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.feed-card-stage.feed-enter-from-right {
  animation: feedEnterFromRight 220ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.feed-card-stage.feed-exit-dynamic {
  transition:
    transform var(--feed-exit-duration, 180ms) cubic-bezier(0.22, 0.85, 0.2, 1),
    opacity var(--feed-exit-duration, 180ms) ease;
  transform: translate3d(var(--feed-exit-x, 0), var(--feed-exit-y, 0), 0) rotate(var(--feed-exit-rot, 0deg)) scale(0.975);
  opacity: 0;
}

.feed-card-stage.is-drag-left {
  border-color: rgba(255, 107, 107, 0.65);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 107, 107, 0.28) inset;
}

.feed-card-stage.is-drag-right {
  border-color: rgba(46, 213, 115, 0.65);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(46, 213, 115, 0.28) inset;
}

.feed-card-stage.is-drag-up {
  border-color: rgba(116, 185, 255, 0.72);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(116, 185, 255, 0.28) inset;
}

.feed-card-stage.is-snapping {
  transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.feed-card-stage.feed-exit-up {
  animation: feedExitUp 180ms ease forwards;
}

.feed-card-stage.feed-exit-left {
  animation: feedExitLeft 180ms ease forwards;
}

.feed-card-stage.feed-exit-right {
  animation: feedExitRight 180ms ease forwards;
}

@keyframes feedExitUp {
  from {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
  to {
    transform: translate3d(0, -44px, 0);
    opacity: 0;
  }
}

@keyframes feedExitLeft {
  from {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
  to {
    transform: translate3d(-44px, 0, 0);
    opacity: 0;
  }
}

@keyframes feedExitRight {
  from {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
  to {
    transform: translate3d(44px, 0, 0);
    opacity: 0;
  }
}

@keyframes feedEnterFromUp {
  from {
    transform: translate3d(0, 26px, 0) scale(0.985);
    opacity: 0.72;
  }
  to {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 1;
  }
}

@keyframes feedEnterFromDown {
  from {
    transform: translate3d(0, -26px, 0) scale(0.985);
    opacity: 0.72;
  }
  to {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 1;
  }
}

@keyframes feedEnterFromLeft {
  from {
    transform: translate3d(-22px, 0, 0) scale(0.988);
    opacity: 0.78;
  }
  to {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 1;
  }
}

@keyframes feedEnterFromRight {
  from {
    transform: translate3d(22px, 0, 0) scale(0.988);
    opacity: 0.78;
  }
  to {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 1;
  }
}

@keyframes feedBackLift1 {
  from {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.58;
  }
  to {
    transform: translate3d(0, -6px, 0) scale(1.005);
    opacity: 0.72;
  }
}

@keyframes feedBackLift2 {
  from {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.38;
  }
  to {
    transform: translate3d(0, -8px, 0) scale(1.01);
    opacity: 0.56;
  }
}

/* 练习页卡片头（对齐 answer-header） */
.answer-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.answer-progress {
  font-size: 14px;
  color: var(--color-text-muted);
}

.answer-type {
  font-size: 13px;
  color: var(--color-text-muted);
  background: #f5f5f5;
  padding: 4px 10px;
  border-radius: 4px;
}

.answer-question {
  color: var(--color-text);
}

.translation-source {
  background: var(--color-passage-bg);
  border-left: 3px solid var(--color-passage-bar);
  padding: 16px 20px;
  margin: 12px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  border-radius: 0 8px 8px 0;
  white-space: pre-wrap;
}

.quiz-card-head {
  margin-bottom: 0;
}

.quiz-booklet-title {
  margin: 0;
  font-size: 1.05rem;
}

.quiz-stage-meta--toolbar {
  margin-top: 8px;
}

.quiz-toolbar-actions {
  margin: 0;
  justify-content: flex-end;
}

.translation-textarea:focus {
  outline: none;
  border-color: var(--color-text);
}

.translation-textarea {
  width: 100%;
  min-height: 120px;
  padding: 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}

.translation-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
  align-items: stretch;
}

.translation-stack .btn-submit {
  width: 100%;
  max-width: none;
}

.btn-submit {
  width: 100%;
  padding: 14px 16px !important;
  background: var(--color-primary) !important;
  color: #fff !important;
  border: none !important;
  border-radius: 8px !important;
  font-size: 15px !important;
  font-weight: 500 !important;
  cursor: pointer;
}

.btn-submit:hover {
  background: var(--color-primary-strong) !important;
}

.btn-submit:disabled {
  background: #ccc !important;
  cursor: not-allowed;
}

.submit-bar {
  margin-top: 16px;
  padding-top: 12px;
  flex-direction: column;
  align-items: stretch;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.feature-grid--boards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 720px) {
  .feature-grid--boards {
    grid-template-columns: 1fr;
  }
}

.quiz-board-toolbar {
  margin-bottom: var(--space-4);
  padding: 16px;
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.quiz-board-toolbar--compact {
  padding: 8px 12px;
  margin-bottom: var(--space-3);
}

.quiz-path-details {
  border: none;
  background: transparent;
}

.quiz-path-details__summary {
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  list-style: none;
  user-select: none;
}

.quiz-path-details__summary::-webkit-details-marker {
  display: none;
}

.quiz-path-details[open] .quiz-path-details__summary {
  margin-bottom: var(--space-2);
}

.quiz-path-details .quiz-stage-row {
  margin-top: var(--space-2);
}

.quiz-stage-row {
  align-items: center;
  gap: var(--space-2);
}

.quiz-stage-label {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text-muted);
  margin-right: var(--space-2);
}

.quiz-stage-btn.active,
.quiz-extra-btn.active {
  background: var(--color-primary) !important;
  color: #fff !important;
  border: 1px solid var(--color-primary) !important;
}

.quiz-stage-btn.stage-locked,
.quiz-extra-btn.stage-locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.feature-card {
  border: 1px solid #dfe6f0;
  background: #fff;
  color: #1f355e;
  border-radius: 12px;
  padding: 14px 10px;
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(32, 60, 120, 0.08);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.feature-card:hover {
  transform: translateY(-2px);
}

.feature-title {
  font-size: 15px;
  font-weight: 700;
}

.feature-sub {
  font-size: 12px;
  color: #66758d;
  font-weight: 500;
}

.feature-disabled {
  opacity: 0.72;
  background: #f8fafc;
  border-style: dashed;
}

.feature-locked {
  opacity: 0.55;
  filter: grayscale(0.15);
  position: relative;
}

.feature-locked::after {
  content: "先完成上一步";
  position: absolute;
  right: 8px;
  top: 8px;
  font-size: 11px;
  color: #9d174d;
  background: #ffe4ef;
  border-radius: 999px;
  padding: 2px 8px;
}

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

.stat-card {
  border: 1px solid #e3e8f2;
  border-radius: 10px;
  background: #fafcff;
  padding: 10px;
}

.stat-card .k {
  color: var(--color-text-muted);
  font-size: 12px;
}

.stat-card .v {
  font-size: 18px;
  font-weight: 700;
  margin-top: 6px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-top: 14px;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--duration-normal) var(--easing-standard);
}

.hidden {
  display: none;
}

.row {
  display: flex;
  gap: 10px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.between {
  justify-content: space-between;
  align-items: center;
}

input,
button,
textarea {
  font-size: var(--font-size-md);
}

input,
textarea {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px;
  width: 100%;
}

button {
  background: var(--color-primary);
  border: none;
  color: #fff;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--easing-standard), background var(--duration-fast) var(--easing-standard);
}

button:hover {
  background: var(--color-primary-strong);
}

button:active {
  transform: translateY(1px);
}

button.secondary {
  background: var(--color-surface-muted);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

button.secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-accent-blue);
  color: var(--color-text);
}

.msg {
  min-height: 20px;
}

.question-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px;
  margin-top: 12px;
}

.question-item.answer-card {
  background: var(--color-surface);
  padding: 24px 20px;
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.reading-layout {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-surface-muted) 100%);
}

.question-item.answer-card.reading-layout {
  background: var(--color-surface);
}

/* 阅读一页一题：主流 App 式信息层级（进度 / 文章 / 题干卡 / 底部操作条） */
.question-item.answer-card.reading-layout-modern {
  padding: 16px 14px 20px;
  border-radius: 16px;
}

.reading-q-head {
  margin-bottom: 10px;
}

.reading-q-head__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.reading-type-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: #b8dcff;
  background: rgba(9, 132, 227, 0.18);
  border: 1px solid rgba(116, 185, 255, 0.35);
}

.reading-q-head__seq {
  font-size: 12px;
  color: var(--color-text-muted);
}

.reading-progress {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  margin-bottom: 8px;
}

.reading-progress__fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #0984e3, #55efc4);
  transition: width 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reading-q-head__sub {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
}

.reading-slide-label {
  font-weight: 700;
  color: var(--color-text);
}

.reading-slide-hint {
  color: var(--color-text-muted);
  font-size: 12px;
}

.reading-brief {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--color-text-muted);
}

.reading-passage-shell {
  border-radius: 12px;
  border: 1px solid rgba(116, 185, 255, 0.2);
  background: rgba(10, 14, 34, 0.35);
}

.reading-passage-shell .q-content.reading-passage {
  margin-top: 0;
  border-radius: 0 10px 10px 0;
}

.reading-anno-details {
  margin: 10px 0 12px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: rgba(30, 30, 54, 0.55);
  overflow: hidden;
}

.reading-anno-details__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 36px 10px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  user-select: none;
  position: relative;
}

.reading-anno-details__summary::-webkit-details-marker {
  display: none;
}

.reading-anno-details__summary::after {
  content: "";
  position: absolute;
  right: 14px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -5px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  transition: transform 0.2s var(--easing-standard, ease);
  opacity: 0.85;
}

.reading-anno-details[open] .reading-anno-details__summary::after {
  margin-top: -2px;
  transform: rotate(225deg);
}

.reading-anno-count {
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: rgba(9, 132, 227, 0.55);
}

.reading-anno-details__body {
  padding: 0 10px 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.reading-part-pill {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  color: #cbe0ff;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.reading-subq.reading-subq--single {
  border: 1px solid rgba(116, 185, 255, 0.22);
  border-radius: 16px;
  padding: 14px 12px 16px;
  background: linear-gradient(180deg, rgba(37, 37, 66, 0.95), rgba(30, 30, 54, 0.92));
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
}

.reading-option-grid label.answer-option {
  min-height: 52px;
  align-items: center;
  border-radius: 12px;
  padding: 14px 14px;
}

.reading-option-grid .answer-option-letter {
  width: 28px;
  height: 28px;
  font-size: 14px;
}

.reading-option-grid .answer-option-text {
  font-size: 16px;
  line-height: 1.5;
}

.reading-post-answer {
  margin-top: 12px;
}

.reading-unified-actions--bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr);
  gap: 10px;
  align-items: stretch;
  margin-top: 14px;
  padding-top: 4px;
}

.reading-nav-pill {
  border-radius: 12px !important;
  border: 1px solid var(--color-border) !important;
  background: rgba(30, 30, 54, 0.85) !important;
  color: var(--color-text) !important;
  font-size: 13px !important;
  font-weight: 600 !important;
  padding: 12px 8px !important;
}

.reading-nav-pill:disabled {
  opacity: 0.45;
}

.reading-submit-main {
  border-radius: 12px !important;
  font-weight: 700 !important;
  padding: 12px 10px !important;
  font-size: 14px !important;
}

@media (max-width: 600px) {
  .quiz-reading-pane.reading-pane-fixed {
    max-height: min(38vh, 340px);
  }

  .reading-unified-actions--bar {
    padding-bottom: calc(4px + env(safe-area-inset-bottom, 0px));
  }

  .reading-slide-hint {
    max-width: 52%;
    text-align: right;
    line-height: 1.35;
  }
}

.q-header-compact {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 12px;
}

.q-prompt-reading {
  font-size: 15px;
  color: var(--color-text-muted);
}

.q-prompt-translation {
  font-size: 17px;
  line-height: 1.8;
}

.q-header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-weight: 600;
}

.q-prompt {
  margin-top: 8px;
  color: var(--color-text-muted);
}

.q-content {
  margin-top: 10px;
  padding: 10px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  border: 1px solid var(--color-border);
  white-space: pre-wrap;
  line-height: var(--line-height-normal);
}

.reading-passage {
  max-width: 78ch;
  margin-left: auto;
  margin-right: auto;
  padding: 16px 20px;
  background: var(--color-passage-bg);
  border: none;
  border-left: 3px solid var(--color-passage-bar);
  border-radius: 0 8px 8px 0;
  color: var(--color-text);
  line-height: 1.8;
  letter-spacing: 0.02em;
  text-align: left;
}

.quiz-reading-pane {
  max-height: 40vh;
  overflow-y: auto;
  padding-right: 4px;
}

.quiz-reading-pane.reading-pane-fixed {
  max-height: 36vh;
}

.reading-slide-shell {
  position: relative;
  overflow: hidden;
}

.reading-subq--single {
  min-height: 220px;
}

.reading-subq--single .reading-stem-main {
  margin-top: 10px;
  margin-bottom: 8px;
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
}

.reading-unified-actions {
  margin-top: 10px;
}

.reading-slide-shell.slide-left .reading-subq--single {
  animation: readingSlideLeft 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reading-slide-shell.slide-right .reading-subq--single {
  animation: readingSlideRight 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes readingSlideLeft {
  0% {
    transform: translate3d(28px, 0, 0);
    opacity: 0.55;
  }
  100% {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
}

@keyframes readingSlideRight {
  0% {
    transform: translate3d(-28px, 0, 0);
    opacity: 0.55;
  }
  100% {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
}

.reading-nav {
  position: sticky;
  top: 8px;
  z-index: 3;
  background: rgba(30, 30, 54, 0.9);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px;
  backdrop-filter: blur(4px);
}

.reading-part h3 {
  font-size: var(--font-size-xl);
  letter-spacing: 0.2px;
}

.reading-subq {
  background: var(--color-surface-muted);
  border-color: var(--color-border);
}

.reading-stem {
  line-height: var(--line-height-normal);
  color: var(--color-text);
}

.reading-subq .option-grid label.answer-option {
  display: flex;
  min-width: 0;
}

.option-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.option-grid label,
label.answer-option {
  width: 100%;
  min-height: auto;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--color-surface-muted);
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  margin: 0;
}

.option-grid label:hover,
label.answer-option:hover {
  background: rgba(9, 132, 227, 0.08);
}

.option-grid label:has(input:checked),
label.answer-option:has(input:checked),
label.answer-option.answer-option-selected {
  background: rgba(9, 132, 227, 0.18);
  border-color: var(--color-accent-blue);
}

.option-grid label .answer-option-letter,
.answer-option-letter {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.option-grid label:has(input:checked) .answer-option-letter,
label.answer-option:has(input:checked) .answer-option-letter,
label.answer-option.answer-option-selected .answer-option-letter {
  background: var(--color-accent-blue);
  color: #fff;
  border-color: var(--color-accent-blue);
}

.answer-option-text {
  flex: 1;
  font-size: 15px;
  line-height: 1.5;
  color: var(--color-text);
}

.quiz-stage-meta {
  margin-top: 8px;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface-muted);
}

.home-cta-block {
  display: grid;
  gap: 8px;
}

.btn-cta-main {
  width: 100%;
}

.home-continue-hint {
  margin: 0;
  min-height: 18px;
}

.todo-details > summary {
  list-style: none;
}

.todo-details > summary::-webkit-details-marker {
  display: none;
}

.todo-details__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.todo-details__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.todo-details__chev {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(45deg);
  transition: transform var(--duration-fast) var(--easing-standard);
}

.todo-details[open] .todo-details__chev {
  transform: rotate(225deg);
}

.todo-details__body {
  margin-top: 10px;
}

.reading-subq input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.anno-mark {
  background: #fff3a3;
  padding: 0 2px;
  border-radius: 3px;
}

.reading-annot-actions {
  margin-top: 8px;
}

.reading-annotation-panel {
  margin-top: 8px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px;
  background: var(--color-surface-muted);
}

.answer-wrap {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}

textarea {
  min-height: 140px;
  resize: vertical;
  line-height: var(--line-height-tight);
}

.result {
  margin-top: 16px;
  padding: 20px;
  background: var(--color-surface-muted);
  border-radius: 8px;
  border-left: none;
  line-height: 1.7;
  word-break: break-word;
  font-size: 14px;
  color: var(--color-text);
}

/* 文题同屏：保证原文和输入区都可见，避免输入框遮挡原文 */
@media (max-width: 900px) {
  .answer-wrap {
    grid-template-columns: 1fr;
  }
  .reading-passage {
    max-width: 100%;
    padding: 12px;
  }
  .reading-nav {
    position: static;
  }
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .feature-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .option-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .container {
    padding: 10px;
  }
  .card {
    padding: 12px;
  }
  textarea {
    min-height: 120px;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 8px 10px calc(82px + env(safe-area-inset-bottom));
  }

  .topbar {
    padding: 10px;
    margin: 0 -10px 8px;
    gap: 8px;
    flex-wrap: nowrap;
  }

  .topbar-title {
    font-size: 18px;
  }

  .topbar-right,
  .topbar-actions {
    gap: 6px;
    flex-wrap: nowrap;
    min-width: 0;
  }

  .topbar-search,
  #btnForceFrontendReload {
    display: none !important;
  }

  .topbar-icon-btn {
    width: 30px;
    height: 30px;
  }

  .topbar-user {
    max-width: 84px;
    font-size: 12px;
  }

  #btnLogout.btn-text.small {
    padding: 5px 6px !important;
    font-size: 12px !important;
  }

  #appMemory .card {
    padding: 10px;
  }

  .memory-goal-line {
    font-size: 13px;
  }

  .memory-goal-sub,
  .memory-session-meta,
  .memory-clue {
    font-size: 12px;
    line-height: 1.45;
  }

  .memory-item {
    padding: 12px;
    margin-top: 10px;
  }

  .memory-trainer-card {
    min-height: 320px;
  }

  .word-trainer-stack-wrap {
    min-height: 250px;
  }

  .word-stack-card--back1,
  .word-stack-card--back2 {
    height: 202px;
    top: 12px;
  }

  .word-stack-card--front {
    min-height: 216px;
  }

  .word-stack-front {
    margin-top: 32px;
    font-size: 22px;
  }

  .word-flip-main {
    font-size: 24px;
  }

  .rating-btn {
    padding: 11px 8px !important;
    font-size: 13px !important;
  }
}

/* 旧 .bottom-tabbar 已合并为 .bottom-nav（UI V3） */

/* ── 真题管理 ── */
.hint-text {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  margin: 4px 0;
}

.sub-section {
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  margin-top: 14px;
}

.sub-section h3 {
  margin: 0 0 8px;
  font-size: var(--font-size-lg);
  color: var(--color-text);
}

.row.wrap {
  flex-wrap: wrap;
  align-items: center;
}

select {
  font-size: var(--font-size-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px;
  background: var(--color-surface-muted);
  color: var(--color-text);
  cursor: pointer;
}

button.small {
  padding: 6px 10px;
  font-size: var(--font-size-sm);
}

button.btn-primary.small {
  padding: 8px 14px !important;
  font-size: var(--font-size-sm) !important;
  max-width: none;
  margin: 0;
  display: inline-block;
}

.paper-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
  max-height: 320px;
  overflow-y: auto;
}

.paper-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-muted);
  flex-wrap: wrap;
  font-size: var(--font-size-sm);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  white-space: nowrap;
}

.badge.tem4 {
  background: var(--color-success-bg);
  color: var(--color-success-text);
}

.badge.tem8 {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
}

.preview-text {
  font-size: var(--font-size-xs);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
  background: var(--color-surface-muted);
  border-radius: var(--space-1);
  padding: 8px;
  margin: 6px 0 0;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

.memory-item {
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px;
  margin-top: 12px;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

body.immersive-memory #memoryCard {
  border: none;
  background: transparent;
  box-shadow: none;
  padding: 0;
}

body.immersive-memory #memoryCard > .row.between {
  display: none;
}

body.immersive-memory #memoryStats {
  margin: 0 0 6px;
  font-size: 12px;
}

body.immersive-memory .memory-subtabs {
  margin-top: 0;
  margin-bottom: 8px;
}

body.immersive-memory #memoryWordPanel,
body.immersive-memory #memoryPassagePanel {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

body.immersive-memory .memory-session-meta,
body.immersive-memory .memory-clue {
  font-size: 12px;
  margin-bottom: 4px !important;
}

body.immersive-memory #memoryPractice > .memory-clue:nth-of-type(2) {
  display: none;
}

@media (max-width: 600px) {
  body.immersive-mode .container {
    padding: 6px 8px calc(92px + env(safe-area-inset-bottom));
  }

  body.immersive-mode .bottom-nav {
    left: 10px;
    right: 10px;
    bottom: calc(8px + env(safe-area-inset-bottom));
    max-width: none;
    width: auto;
    margin: 0;
    border: 1px solid rgba(166, 195, 255, 0.16);
    border-radius: 18px;
    padding: 6px 6px;
    background: rgba(20, 25, 44, 0.78);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(14px);
  }

  body.immersive-mode .bottom-nav .nav-item {
    padding: 8px 2px !important;
    font-size: 10px;
  }

  body.immersive-memory #memoryStats {
    display: none;
  }

  body.immersive-memory .memory-subtabs {
    justify-content: center;
    margin-bottom: 6px;
  }

  body.immersive-memory .memory-subtab {
    padding: 6px 10px !important;
    font-size: 12px !important;
  }

  body.immersive-memory .word-trainer-stack-wrap {
    min-height: 68vh;
    margin-bottom: 6px;
  }

  body.immersive-memory .word-stack-card--back1,
  body.immersive-memory .word-stack-card--back2 {
    left: 6px;
    right: 6px;
    top: 10px;
    height: calc(68vh - 44px);
  }

  body.immersive-memory .word-stack-card--front {
    min-height: 68vh;
    border-radius: 18px;
    padding: 10px 8px;
  }

  body.immersive-memory .word-flip-card,
  body.immersive-memory .word-flip-face {
    border-radius: 18px;
  }

  body.immersive-memory .word-stack-front {
    margin-top: 24vh;
    font-size: clamp(34px, 8.4vw, 44px);
    line-height: 1.22;
    letter-spacing: 0.2px;
  }

  body.immersive-memory .word-flip-main {
    font-size: clamp(34px, 8.4vw, 44px);
    line-height: 1.22;
    letter-spacing: 0.2px;
  }

  body.immersive-memory .word-flip-sub,
  body.immersive-memory .word-stack-sub,
  body.immersive-memory .memory-session-meta,
  body.immersive-memory .memory-clue,
  body.immersive-memory .word-trainer-controls {
    opacity: 0.78;
  }

  body.immersive-memory .word-trainer-controls--immersive {
    position: sticky;
    bottom: calc(84px + env(safe-area-inset-bottom));
    z-index: 6;
    margin-top: 4px;
    padding: 0 2px;
  }

  body.immersive-memory .word-trainer-controls--immersive .memory-type-actions--duo {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 0;
  }

  body.immersive-memory .word-trainer-controls--immersive .rating-btn {
    border-radius: 14px !important;
    font-size: 14px !important;
    font-weight: 700 !important;
    letter-spacing: 0.2px;
    padding: 12px 10px !important;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.3);
  }

  body.immersive-memory .word-trainer-controls--immersive .hint-text {
    text-align: center;
    font-size: 12px;
    margin-top: 6px;
    opacity: 0.7;
  }

  body.immersive-memory .memory-trainer-card {
    border: none;
    background: transparent;
    box-shadow: none;
    min-height: 0;
    padding: 0;
  }

  body.immersive-feed .feed-viewport {
    min-height: calc(100dvh - 132px);
  }

  body.immersive-feed .feed-card-stage,
  body.immersive-feed .feed-card-stack {
    min-height: calc(100dvh - 148px);
    border-radius: 18px;
  }
}

.memory-item--flash .memory-head {
  font-size: 18px;
  margin-bottom: 6px;
}

.memory-session-meta {
  margin-top: 4px;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.memory-goal-line {
  font-size: 14px;
  color: var(--color-text);
  font-weight: 600;
}

.memory-goal-sub {
  margin-top: 4px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.memory-lock-hint {
  display: inline-block;
  margin-top: 6px;
  margin-right: 6px;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  color: #fdcb6e;
  background: rgba(253, 203, 110, 0.12);
  border: 1px solid rgba(253, 203, 110, 0.25);
}

.memory-subtabs {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  margin-bottom: 6px;
}

.memory-subtab {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
}

.memory-subtab.active {
  background: rgba(9, 132, 227, 0.22);
  border-color: var(--color-accent-blue);
  color: #fff;
}

.memory-back-face {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

/* 与 .hidden 同特异性时，后写的 .memory-back-face 会盖住 display:none，必须显式合并 */
.memory-back-face.hidden {
  display: none;
}

.memory-trainer-card {
  border: 1px solid rgba(116, 185, 255, 0.25);
  min-height: 380px;
  display: grid;
  align-content: start;
}

.memory-trainer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.memory-trainer-title {
  font-size: 16px;
  font-weight: 700;
}

.memory-stage-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.memory-stage-btn {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
}

.memory-stage-btn.active {
  color: #fff;
  border-color: var(--color-accent-blue);
  background: rgba(9, 132, 227, 0.25);
}

.memory-stage-body {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 10px;
  background: rgba(10, 14, 34, 0.35);
}

.memory-head--lg {
  font-size: 26px;
  letter-spacing: 0.2px;
  line-height: 1.3;
}

.memory-clue {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

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

.memory-options label.answer-option {
  align-items: center;
  padding: 12px 14px;
}

.memory-options .answer-option input[type="radio"] {
  width: 18px;
  height: 18px;
  margin: 0;
  flex-shrink: 0;
  accent-color: var(--color-accent-blue);
}

.memory-options .answer-option-text {
  flex: 1;
  min-width: 0;
  text-align: left;
  overflow-wrap: break-word;
  word-break: normal;
}

.memory-options label.answer-option:has(input[type="radio"]) {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  column-gap: 12px;
  align-items: center;
}

.memory-options label.answer-option:has(input[type="radio"]) input[type="radio"] {
  width: 18px;
  height: 18px;
  margin: 0;
  align-self: center;
}

.memory-options .answer-option.is-correct {
  border-color: rgba(0, 184, 148, 0.55);
  background: rgba(0, 184, 148, 0.12);
}

.memory-options .answer-option.is-wrong {
  border-color: rgba(225, 112, 85, 0.55);
  background: rgba(225, 112, 85, 0.1);
}

.memory-stage-body .result-ok {
  color: #55efc4;
}

.memory-stage-body .result-bad {
  color: #fab1a0;
}

.result--loading {
  border: 1px dashed var(--color-border);
  background: rgba(9, 132, 227, 0.08);
  padding: 10px;
  border-radius: var(--radius-sm);
}

.memory-head {
  font-weight: 600;
  color: var(--color-text);
}

.memory-rating {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

/* 记诵词条：按题型定制的操作区（非统一四键 SRS） */
.memory-type-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.memory-type-actions.memory-type-actions--single {
  grid-template-columns: 1fr;
  max-width: 280px;
}

.memory-type-actions.memory-type-actions--duo {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.word-mode-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.word-mode-btn {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
}

.word-mode-btn.active {
  border-color: var(--color-accent-blue);
  background: rgba(9, 132, 227, 0.24);
  color: #fff;
}

.word-trainer-stack-wrap {
  position: relative;
  min-height: 286px;
  perspective: 1100px;
  margin-bottom: 12px;
}

.word-trainer-controls {
  display: grid;
  gap: 10px;
}

.word-trainer-controls .word-detect-card {
  width: min(360px, 100%);
  justify-self: center;
}

.word-stack-card {
  border-radius: 14px;
  transition: transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 260ms ease, box-shadow 260ms ease;
}

.word-stack-card--back1,
.word-stack-card--back2 {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 228px;
  top: 16px;
  padding: 16px 14px;
  border: 1px solid rgba(116, 185, 255, 0.18);
  background: rgba(42, 53, 78, 0.46);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
  pointer-events: none;
}

.word-stack-card--back1 {
  transform: translate3d(0, 8px, 0) scale(0.97) rotate(1.1deg);
  opacity: 0.9;
  z-index: 1;
}

.word-stack-card--back2 {
  transform: translate3d(0, 16px, 0) scale(0.94) rotate(-1.4deg);
  opacity: 0.68;
  z-index: 0;
}

.word-stack-front {
  font-weight: 800;
  font-size: 24px;
  line-height: 1.35;
  text-align: center;
  margin-top: 44px;
  padding: 0 10px;
  word-break: break-word;
}

.word-stack-sub {
  margin-top: 10px;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
}

.word-stack-card--front {
  position: relative;
  inset: 0;
  min-height: 242px;
  padding: 10px;
  border: 1px solid rgba(116, 185, 255, 0.28);
  background: rgba(20, 29, 53, 0.52);
  z-index: 2;
  transform: translate3d(0, 0, 0) scale(1) rotate(0);
  box-shadow: 0 20px 34px rgba(0, 0, 0, 0.34);
  touch-action: pan-y;
}

.word-stack-card--front.is-entering {
  animation: wordCardEnter 320ms cubic-bezier(0.2, 0.9, 0.2, 1);
}

@keyframes wordCardEnter {
  0% {
    transform: translate3d(0, 8px, 0) scale(0.965) rotate(1deg);
    opacity: 0.9;
  }
  100% {
    transform: translate3d(0, 0, 0) scale(1) rotate(0);
    opacity: 1;
  }
}

.word-stack-card--front.word-stack-card--swipe {
  cursor: grab;
}

.word-stack-card--front.is-dragging {
  transition: none !important;
  cursor: grabbing;
}

.word-stack-card--front.is-exit-left {
  transform: translate3d(-130%, 0, 0) rotate(-16deg) scale(0.96);
  opacity: 0;
}

.word-stack-card--front.is-exit-right {
  transform: translate3d(130%, 0, 0) rotate(16deg) scale(0.96);
  opacity: 0;
}

.word-swipe-hint {
  position: absolute;
  top: 18px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.2px;
  opacity: 0;
  transform: translateY(-4px) scale(0.96);
  transition: all 140ms ease;
  pointer-events: none;
}

.word-swipe-hint--left {
  left: 14px;
  background: rgba(225, 112, 85, 0.2);
  color: #ffb2a2;
}

.word-swipe-hint--right {
  right: 14px;
  background: rgba(0, 184, 148, 0.2);
  color: #76ffd8;
}

.word-stack-card--front.is-peek-left .word-swipe-hint--left,
.word-stack-card--front.is-peek-right .word-swipe-hint--right {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.word-stack-card--back1.is-promote {
  transform: translate3d(0, 0, 0) scale(1) rotate(0);
  opacity: 1;
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.32);
}

.word-stack-card--back2.is-promote-next {
  transform: translate3d(0, 8px, 0) scale(0.97) rotate(1deg);
  opacity: 0.84;
}

.word-flip-card {
  position: relative;
  min-height: 222px;
  border-radius: 14px;
  transform-style: preserve-3d;
  transition: transform 320ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.word-flip-card.can-flip {
  cursor: pointer;
}

.word-flip-card.is-flipped {
  transform: rotateY(180deg);
}

.word-flip-face {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(180deg, rgba(57, 72, 98, 0.96), rgba(46, 60, 85, 0.92));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  backface-visibility: hidden;
}

.word-card-tools {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.word-card-tool {
  pointer-events: auto;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(9, 14, 31, 0.4);
  color: #dceaff;
  font-size: 16px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.word-card-tool.is-active {
  border-color: rgba(116, 185, 255, 0.66);
  background: rgba(9, 132, 227, 0.25);
  color: #fff;
}

.word-flip-face--back {
  transform: rotateY(180deg);
}

.word-flip-main {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
  word-break: break-word;
}

.word-flip-sub {
  margin-top: 12px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.rating-btn {
  padding: 14px 8px !important;
  border: none !important;
  border-radius: 8px !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  cursor: pointer;
  text-align: center;
  color: inherit;
}

.rating-btn .interval {
  font-size: 11px;
  opacity: 0.85;
  display: block;
  margin-top: 4px;
  font-weight: 400;
}

.rating-btn.again {
  background: rgba(225, 112, 85, 0.2) !important;
  color: #fab1a0 !important;
}

.rating-btn.hard {
  background: rgba(253, 203, 110, 0.15) !important;
  color: #fdcb6e !important;
}

.rating-btn.good {
  background: rgba(0, 184, 148, 0.18) !important;
  color: #55efc4 !important;
}

.rating-btn.easy {
  background: rgba(9, 132, 227, 0.22) !important;
  color: #74b9ff !important;
}

#todoList .memory-item .row.between {
  margin-top: 0;
}

.overlay-modal {
  position: fixed;
  inset: 0;
  z-index: 1800;
  background: rgba(0, 0, 0, 0.56);
  display: grid;
  place-items: center;
  padding: 16px;
}

.overlay-modal.hidden {
  display: none;
}

.overlay-modal__panel {
  width: min(420px, 100%);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.overlay-modal__panel h3 {
  margin: 0 0 8px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}

/* 管理台：保留高对比主按钮，避免与 V3 黑按钮混淆 */
#adminConsole button:not(.secondary):not(.small) {
  background: #2463eb;
  color: #fff;
}

#adminConsole button:not(.secondary):not(.small):hover {
  background: #1d4ed8;
}