/* ===== CSS Variables & Reset ===== */
:root {
  --primary: #DC2626;
  --primary-dark: #991B1B;
  --chinese: #F43F5E;
  --math: #0EA5E9;
  --english: #10B981;
  --physics: #F59E0B;
  --chemistry: #8B5CF6;
  --history: #D97706;
  --politics: #EC4899;
  --geography: #14B8A6;
  --biology: #84CC16;
  --bg: #FFF5F5;
  --card: #FFFFFF;
  --text: #1E293B;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border: #FEE2E2;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.10);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --nav-height: 64px;
  --header-height: 56px;
  --tag-key: #EF4444;
  --tag-exam: #3B82F6;
  --tag-difficult: #F59E0B;
  --tag-pitfall: #8B5CF6;
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-md: 1rem;
  --font-lg: 1.125rem;
  --font-xl: 1.375rem;
  --font-2xl: 1.75rem;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: calc(var(--nav-height) + 24px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { border: none; background: none; cursor: pointer; font: inherit; color: inherit; }
img { max-width: 100%; display: block; }

/* ===== Utility Classes ===== */
.container { max-width: 600px; margin: 0 auto; padding: 0 16px; }
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.card-sm {
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 14px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

/* ===== Header ===== */
.page-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
}
.page-header h1 {
  font-size: var(--font-xl);
  font-weight: 700;
}
.header-back {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-md);
  color: var(--primary);
  font-weight: 500;
}
.header-back svg { width: 20px; height: 20px; }

/* ===== Tags ===== */
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: var(--font-xs);
  font-weight: 600;
  line-height: 1.8;
}
.tag-key { background: #FFF0ED; color: var(--tag-key); }
.tag-exam { background: #E0F2FE; color: var(--tag-exam); }
.tag-difficult { background: #FFE4E6; color: var(--tag-difficult); }
.tag-pitfall { background: #F0EEFF; color: var(--tag-pitfall); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: var(--font-md);
  font-weight: 600;
  transition: all 0.2s;
  cursor: pointer;
}
.btn:active { transform: scale(0.96); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}
.btn-sm { padding: 6px 16px; font-size: var(--font-sm); border-radius: 20px; }
.btn-block { display: flex; width: 100%; }

/* ===== Bottom Navigation ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--card);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: var(--nav-height);
  padding-bottom: env(safe-area-inset-bottom, 0);
  box-shadow: 0 -2px 12px rgba(0,0,0,0.04);
}
.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: var(--font-xs);
  color: var(--text-muted);
  transition: color 0.2s;
  padding: 4px 12px;
  border-radius: 12px;
}
.nav-item.active { color: var(--primary); font-weight: 600; }
.nav-item svg { width: 24px; height: 24px; }

/* ===== Subject Cards ===== */
.subject-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.subject-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
  cursor: pointer;
}
.subject-card:active { transform: scale(0.95); }
.subject-card .subject-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 8px;
  font-size: 24px;
}
.subject-card .subject-icon.chinese { background: #FFE4E6; }
.subject-card .subject-icon.math { background: #E0F2FE; }
.subject-card .subject-icon.english { background: #D1FAE5; }
.subject-card .subject-icon.physics { background: #FEF3C7; }
.subject-card .subject-icon.chemistry { background: #EDE9FE; }
.subject-card .subject-icon.history { background: #FFF7ED; }
.subject-card .subject-icon.politics { background: #FCE7F3; }
.subject-card .subject-icon.geography { background: #CCFBF1; }
.subject-card .subject-icon.biology { background: #ECFCCB; }
.subject-card .subject-name {
  font-size: var(--font-md);
  font-weight: 700;
  margin-bottom: 2px;
}
.subject-card .subject-count {
  font-size: var(--font-xs);
  color: var(--text-muted);
}

/* ===== Section List ===== */
.section-list { margin-bottom: 16px; }
.section-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--card);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.15s;
}
.section-item:active { transform: scale(0.98); }
.section-item .section-info h3 {
  font-size: var(--font-md);
  font-weight: 600;
  margin-bottom: 2px;
}
.section-item .section-info p {
  font-size: var(--font-xs);
  color: var(--text-muted);
}
.section-item .section-arrow {
  color: var(--text-muted);
  font-size: var(--font-lg);
}

/* ===== Knowledge Detail ===== */
.knowledge-detail { margin-bottom: 20px; }
.knowledge-detail .kd-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 12px;
}
.knowledge-detail .kd-title {
  font-size: var(--font-xl);
  font-weight: 700;
  flex: 1;
}
.knowledge-detail .kd-section-label {
  font-size: var(--font-sm);
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 8px;
}
.knowledge-detail .kd-detail {
  font-size: var(--font-md);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}
.knowledge-detail .kd-technique {
  background: #FFFBF5;
  border-left: 4px solid var(--primary);
  padding: 12px 16px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin-bottom: 14px;
  font-size: var(--font-sm);
  color: var(--text-secondary);
}
.knowledge-detail .kd-technique strong {
  color: var(--primary);
  display: block;
  margin-bottom: 4px;
}
.knowledge-detail .kd-examples {
  margin-bottom: 14px;
}
.knowledge-detail .kd-examples h4 {
  font-size: var(--font-sm);
  font-weight: 600;
  margin-bottom: 6px;
}
.knowledge-detail .kd-example-item {
  background: #F8F9FA;
  border-radius: var(--radius-xs);
  padding: 10px 14px;
  margin-bottom: 6px;
  font-size: var(--font-sm);
}
.knowledge-detail .kd-example-item .q { font-weight: 600; margin-bottom: 4px; }
.knowledge-detail .kd-example-item .a { color: var(--math); }
.knowledge-detail .kd-tips {
  background: #FFFBF0;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: var(--font-sm);
  color: var(--text-secondary);
}
.knowledge-detail .kd-tips strong { color: var(--primary); }

/* ===== Point Read Cards ===== */
.pointread-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.pointread-card {
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}
.pointread-card:active { transform: scale(0.95); background: #FFFBF5; }
.pointread-card.playing {
  border: 2px solid var(--primary);
  box-shadow: 0 0 0 4px rgba(79,70,229,0.15);
}
.pointread-card.loading {
  border: 2px solid var(--math);
  box-shadow: 0 0 0 4px rgba(74,144,217,0.15);
  animation: pulse-loading 1s ease-in-out infinite;
}
@keyframes pulse-loading {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.pointread-card .pc-word {
  font-size: var(--font-xl);
  font-weight: 700;
  margin-bottom: 6px;
}
.pointread-card .pc-reading {
  font-size: var(--font-sm);
  color: var(--text-muted);
  margin-bottom: 4px;
}
.pointread-card .pc-meaning {
  font-size: var(--font-xs);
  color: var(--text-secondary);
}
.pointread-card .pc-speaker {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  color: var(--primary);
}

/* ===== Recite ===== */
.recite-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
  cursor: pointer;
  position: relative;
}
.recite-card .rc-title {
  font-size: var(--font-lg);
  font-weight: 700;
  margin-bottom: 8px;
}
.recite-card .rc-content {
  font-size: var(--font-md);
  line-height: 2;
  color: var(--text-secondary);
  position: relative;
}
.recite-card .rc-content.masked {
  filter: blur(6px);
  user-select: none;
  cursor: pointer;
}
.recite-card .rc-content.masked .line-revealed {
  filter: none;
}
.recite-card .rc-content .line {
  display: block;
  padding: 4px 0;
  border-radius: 4px;
  transition: filter 0.3s;
}
.recite-card .rc-content .line-revealed {
  filter: none;
  background: rgba(79,70,229,0.05);
}
.recite-card .rc-notes {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  font-size: var(--font-sm);
  color: var(--text-muted);
}
.recite-card .rc-type-tag {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: var(--font-xs);
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
}
.recite-card .rc-type-tag.poem { background: #FFE4E6; color: var(--chinese); }
.recite-card .rc-type-tag.formula { background: #E0F2FE; color: var(--math); }
.recite-card .rc-type-tag.sentence { background: #D1FAE5; color: var(--english); }
.recite-card .rc-type-tag.fact { background: #F0F4FF; color: var(--primary); }

/* ===== Check-in ===== */
.checkin-stats {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}
.checkin-stat-card {
  flex: 1;
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow);
}
.checkin-stat-card .stat-number {
  font-size: var(--font-2xl);
  font-weight: 800;
  color: var(--primary);
}
.checkin-stat-card .stat-label {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-top: 2px;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-bottom: 4px;
}
.calendar-day-header {
  text-align: center;
  font-size: var(--font-xs);
  color: var(--text-muted);
  font-weight: 600;
  padding: 4px 0;
}
.calendar-day {
  aspect-ratio: 1;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-xs);
  font-weight: 500;
  cursor: default;
  transition: transform 0.15s;
}
.calendar-day.empty { background: transparent; }
.calendar-day.today {
  border: 2px solid var(--primary);
  color: var(--primary);
  font-weight: 700;
}
.calendar-day.checked { background: var(--primary); color: #fff; }
.calendar-day.checked-light {
  background: rgba(79,70,229,0.2);
  color: var(--primary);
}
.calendar-day.unchecked {
  background: #F5F5F5;
  color: var(--text-muted);
}
.calendar-day.future { color: var(--text-muted); opacity: 0.4; }

.calendar-month-label {
  text-align: center;
  font-size: var(--font-md);
  font-weight: 700;
  margin: 16px 0 8px;
}

/* ===== Achievement Badges ===== */
.badge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.badge-item {
  text-align: center;
  padding: 12px 8px;
  border-radius: var(--radius-sm);
  background: var(--card);
  box-shadow: var(--shadow);
}
.badge-item .badge-icon {
  font-size: 36px;
  margin-bottom: 6px;
}
.badge-item .badge-name {
  font-size: var(--font-xs);
  font-weight: 600;
  margin-bottom: 2px;
}
.badge-item .badge-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
}
.badge-item.locked {
  opacity: 0.4;
  filter: grayscale(1);
}
.badge-item.locked .badge-icon { filter: grayscale(1); }

/* ===== Today Tasks ===== */
.task-list { margin-bottom: 20px; }
.task-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--card);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  box-shadow: var(--shadow);
}
.task-item .task-check {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  cursor: pointer;
}
.task-item .task-check.done {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.task-item .task-info { flex: 1; }
.task-item .task-info .task-name {
  font-size: var(--font-md);
  font-weight: 600;
  margin-bottom: 2px;
}
.task-item .task-info .task-meta {
  font-size: var(--font-xs);
  color: var(--text-muted);
}
.task-item .task-points {
  font-size: var(--font-sm);
  color: var(--primary);
  font-weight: 700;
}
}

/* ===== Search Bar ===== */
.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border-radius: 24px;
  padding: 8px 16px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.search-bar input {
  flex: 1;
  border: none;
  outline: none;
  font-size: var(--font-md);
  background: transparent;
  color: var(--text);
}
.search-bar input::placeholder { color: var(--text-muted); }

/* ===== Filter Tabs ===== */
.filter-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}
.filter-tabs::-webkit-scrollbar { display: none; }
.filter-tab {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: var(--font-sm);
  font-weight: 600;
  white-space: nowrap;
  background: var(--card);
  color: var(--text-secondary);
  box-shadow: var(--shadow);
  transition: all 0.2s;
  flex-shrink: 0;
}
.filter-tab.active {
  background: var(--primary);
  color: #fff;
}

/* ===== Subject Selector ===== */
.subject-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.subject-tab {
  padding: 8px 12px;
  border-radius: 10px;
  font-size: var(--font-sm);
  font-weight: 600;
  text-align: center;
  background: var(--card);
  box-shadow: var(--shadow);
  transition: all 0.2s;
  white-space: nowrap;
}
.subject-tab.active { color: #fff; }
.subject-tab.chinese.active { background: var(--chinese); }
.subject-tab.math.active { background: var(--math); }
.subject-tab.english.active { background: var(--english); }
.subject-tab.physics.active { background: var(--physics); }
.subject-tab.chemistry.active { background: var(--chemistry); }
.subject-tab.history.active { background: var(--history); }
.subject-tab.politics.active { background: var(--politics); }
.subject-tab.geography.active { background: var(--geography); }
.subject-tab.biology.active { background: var(--biology); }

/* ===== Expand/collapse ===== */
.expand-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 8px;
  font-size: var(--font-sm);
  color: var(--primary);
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  border-top: 1px solid var(--border);
  margin-top: 12px;
  padding-top: 12px;
}

/* ===== Related Links ===== */
.related-section { margin-top: 20px; }
.related-section h3 {
  font-size: var(--font-md);
  font-weight: 700;
  margin-bottom: 10px;
}
.related-link {
  display: block;
  padding: 10px 14px;
  background: var(--card);
  border-radius: var(--radius-xs);
  margin-bottom: 6px;
  font-size: var(--font-sm);
  color: var(--math);
  box-shadow: var(--shadow);
}

/* ===== Welcome Banner ===== */
.welcome-banner {
  background: linear-gradient(135deg, var(--primary), #FF8C42);
  color: #fff;
  border-radius: var(--radius);
  padding: 24px 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-lg);
}
.welcome-banner .greeting {
  font-size: var(--font-xs);
  opacity: 0.9;
  margin-bottom: 4px;
}
.welcome-banner .user-name {
  font-size: var(--font-2xl);
  font-weight: 800;
  margin-bottom: 8px;
}
.welcome-banner .streak-info {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-sm);
  opacity: 0.95;
}

/* ===== Quick Actions ===== */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
.quick-action {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 16px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.15s;
}
.quick-action:active { transform: scale(0.96); }
.quick-action .qa-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.quick-action .qa-text { font-size: var(--font-sm); font-weight: 600; }
.quick-action .qa-sub { font-size: var(--font-xs); color: var(--text-muted); }

/* ===== Toast ===== */
.toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #2D3436;
  color: #fff;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: var(--font-sm);
  font-weight: 500;
  z-index: 999;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.toast.show { opacity: 1; }

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: var(--font-sm); }

/* ===== Playlist mode ===== */
.playlist-bar {
  position: fixed;
  bottom: calc(var(--nav-height) + 8px);
  left: 16px;
  right: 16px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 12px 16px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 150;
}
.playlist-bar .pl-info {
  font-size: var(--font-sm);
  font-weight: 600;
}
.playlist-bar .pl-controls {
  display: flex;
  gap: 8px;
}

/* ===== Responsive ===== */
@media (max-width: 360px) {
  .subject-cards { gap: 8px; }
  .subject-card { padding: 12px 8px; }
  .pointread-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .badge-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
}

/* ===== Progress Bar ===== */
.progress-bar {
  height: 8px;
  background: #E0E7FF;
  border-radius: 4px;
  overflow: hidden;
  margin: 4px 0;
}
.progress-bar .fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.4s ease;
}
.fill.primary { background: var(--primary); }
.fill.green { background: var(--english); }
.fill.blue { background: var(--math); }
.fill.orange { background: var(--chinese); }
.fill.red { background: var(--tag-key); }

/* ===== Horizontal Chart Bars ===== */
.chart-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.chart-bar-label {
  width: 70px;
  font-size: var(--font-xs);
  font-weight: 600;
  text-align: right;
  flex-shrink: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chart-bar-track {
  flex: 1;
  height: 24px;
  background: #E0E7FF;
  border-radius: 12px;
  overflow: hidden;
  position: relative;
}
.chart-bar-fill {
  height: 100%;
  border-radius: 12px;
  transition: width 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 8px;
  font-size: var(--font-xs);
  font-weight: 700;
  color: #fff;
  min-width: 30px;
}
.chart-bar-fill.high { background: var(--english); }
.chart-bar-fill.mid { background: var(--chinese); }
.chart-bar-fill.low { background: var(--tag-key); }
.chart-bar-value {
  width: 36px;
  font-size: var(--font-xs);
  font-weight: 700;
  text-align: left;
  flex-shrink: 0;
}

/* ===== FAB (Floating Action Button) ===== */
.fab {
  position: fixed;
  bottom: calc(var(--nav-height) + 24px);
  right: 20px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(79,70,229,0.4);
  z-index: 150;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}
.fab:active { transform: scale(0.9); box-shadow: 0 2px 8px rgba(79,70,229,0.3); }

/* ===== Loading Spinner ===== */
.loading-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  gap: 12px;
}
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #E0E7FF;
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

/* ===== Score Circle ===== */
.score-circle-wrap {
  text-align: center;
  padding: 20px 0;
}
.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  border: 6px solid var(--border);
  margin: 0 auto;
}
.score-circle .score-number {
  font-size: 2.5rem;
  line-height: 1;
}
.score-circle .score-total {
  font-size: var(--font-xs);
  color: var(--text-muted);
}
.score-circle.excellent { border-color: var(--english); color: var(--english); }
.score-circle.good { border-color: var(--math); color: var(--math); }
.score-circle.fair { border-color: var(--chinese); color: var(--chinese); }
.score-circle.poor { border-color: var(--tag-key); color: var(--tag-key); }

/* ===== Quiz Option Buttons ===== */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}
.quiz-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  background: var(--card);
  font-size: var(--font-md);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}
.quiz-option:active { transform: scale(0.98); }
.quiz-option.selected { border-color: var(--math); background: #E0F2FE; }
.quiz-option.correct { border-color: var(--english); background: #D1FAE5; }
.quiz-option.wrong { border-color: var(--tag-key); background: #FFF0ED; }
.quiz-option .opt-letter {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: #E0E7FF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-sm);
  flex-shrink: 0;
}
.quiz-option.correct .opt-letter { background: var(--english); color: #fff; }
.quiz-option.wrong .opt-letter { background: var(--tag-key); color: #fff; }

/* ===== Quiz Question Card ===== */
.quiz-question-num {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-bottom: 8px;
}
.quiz-question-text {
  font-size: var(--font-lg);
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.6;
}
.quiz-section-tag {
  display: inline-block;
  padding: 2px 8px;
  background: #FFFBF5;
  border-radius: 10px;
  font-size: var(--font-xs);
  color: var(--chinese);
  margin-bottom: 8px;
}

/* ===== Timer ===== */
.quiz-timer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: var(--font-md);
  font-weight: 700;
  padding: 8px;
  margin-bottom: 12px;
  border-radius: 12px;
  background: var(--card);
  box-shadow: var(--shadow);
}
.quiz-timer.urgent { color: var(--tag-key); }

/* ===== Result Card ===== */
.result-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}
.result-card .result-q {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: var(--font-sm);
}
.result-card .result-info {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-bottom: 4px;
}
.result-card.correct { border-left: 4px solid var(--english); }
.result-card.wrong { border-left: 4px solid var(--tag-key); }

/* ===== Essay Textarea ===== */
.essay-textarea {
  width: 100%;
  min-height: 300px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  font-size: var(--font-md);
  font-family: inherit;
  line-height: 1.8;
  resize: vertical;
  background: var(--card);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.essay-textarea:focus { border-color: var(--primary); }
.essay-textarea::placeholder { color: var(--text-muted); }

/* ===== PIN Pad ===== */
.pin-dots {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}
.pin-dot {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border);
  transition: all 0.2s;
}
.pin-dot.filled { background: var(--primary); border-color: var(--primary); }
.pin-keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  max-width: 240px;
  margin: 0 auto;
}
.pin-key {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-xl);
  font-weight: 700;
  background: var(--card);
  border-radius: 50%;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: all 0.15s;
}
.pin-key:active { transform: scale(0.9); background: #E0E7FF; }
.pin-key.del { font-size: var(--font-sm); color: var(--text-muted); }

/* ===== Section Box ===== */
.section-box {
  margin-bottom: 16px;
}
.section-box h4 {
  font-size: var(--font-sm);
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

/* ===== Modal / Dialog ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 300;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.modal-sheet {
  background: var(--card);
  border-radius: var(--radius) var(--radius) 0 0;
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 24px 20px;
  padding-bottom: calc(24px + env(safe-area-inset-bottom, 0));
}
.modal-sheet h3 {
  font-size: var(--font-lg);
  font-weight: 700;
  margin-bottom: 16px;
}
.modal-sheet .form-group {
  margin-bottom: 14px;
}
.modal-sheet label {
  display: block;
  font-size: var(--font-sm);
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-secondary);
}
.modal-sheet input,
.modal-sheet textarea,
.modal-sheet select {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: var(--font-md);
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
  background: #FAFAFA;
}
.modal-sheet input:focus,
.modal-sheet textarea:focus,
.modal-sheet select:focus {
  border-color: var(--primary);
}
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.modal-actions .btn { flex: 1; }

/* ===== Stat Grid ===== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}
.stat-grid .stat-item {
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
  box-shadow: var(--shadow);
}
.stat-item .stat-val {
  font-size: var(--font-2xl);
  font-weight: 800;
}
.stat-item .stat-lbl {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 24px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 8px; top: 4px; bottom: 4px;
  width: 2px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  margin-bottom: 14px;
  padding-left: 8px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -20px; top: 6px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--primary);
}
.timeline-item .tl-title {
  font-size: var(--font-sm);
  font-weight: 600;
}
.timeline-item .tl-date {
  font-size: var(--font-xs);
  color: var(--text-muted);
}

/* ===== 4-col grid for quick actions ===== */
.quick-actions-8 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
.quick-action-sm {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--card);
  border-radius: var(--radius-sm);
  padding: 14px 8px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.15s;
  text-align: center;
}
.quick-action-sm:active { transform: scale(0.95); }
.quick-action-sm .qasm-icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.quick-action-sm .qasm-text { font-size: var(--font-xs); font-weight: 600; }
.quick-action-sm.coming-soon { opacity: 0.65; }
.quick-action-sm.coming-soon::after {
  content: '即将开放';
  position: absolute;
  top: 4px;
  right: 6px;
  font-size: 0.6rem;
  background: #F59E0B;
  color: #fff;
  padding: 1px 5px;
  border-radius: 6px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ===== Parent Dashboard ===== */
.parent-lock {
  text-align: center;
  padding: 60px 20px;
}
.parent-lock .lock-icon { font-size: 56px; margin-bottom: 16px; }
.parent-lock h2 { font-size: var(--font-xl); font-weight: 700; margin-bottom: 8px; }
.parent-lock p { font-size: var(--font-sm); color: var(--text-muted); margin-bottom: 24px; }

/* ===== Warning Card ===== */
.warning-card {
  background: #FFF5F5;
  border-left: 4px solid var(--tag-key);
  padding: 12px 16px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  margin-bottom: 10px;
  font-size: var(--font-sm);
}
.warning-card strong { color: var(--tag-key); }

/* ===== Recommendation Card ===== */
.rec-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.rec-card .rec-icon {
  font-size: 24px; flex-shrink: 0;
}
.rec-card .rec-info { flex: 1; }
.rec-card .rec-info .rec-title { font-size: var(--font-sm); font-weight: 600; }
.rec-card .rec-info .rec-sub { font-size: var(--font-xs); color: var(--text-muted); }

/* ===== Task Progress (new checkin system) ===== */
.task-item-progress {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px; background: var(--card);
  border-radius: var(--radius-sm); margin-bottom: 8px;
  box-shadow: var(--shadow);
}
.task-progress-icon {
  width: 38px; height: 38px; border-radius: 50%;
  background: #E0E7FF; display: flex;
  align-items: center; justify-content: center;
  font-size: 18px; flex-shrink: 0;
}
.task-progress-icon.done { background: #E8F5E9; }
.task-progress-info { flex: 1; min-width: 0; }
.task-progress-name {
  font-size: var(--font-sm); font-weight: 600;
  margin-bottom: 4px; color: var(--text);
}
.task-progress-bar-wrap { display: flex; align-items: center; gap: 8px; }
.task-progress-bar {
  flex: 1; height: 6px; background: #E0E7FF;
  border-radius: 3px; overflow: hidden;
}
.task-progress-fill {
  height: 100%; background: var(--primary);
  border-radius: 3px; transition: width 0.5s ease;
}
.task-progress-fill.all-done { background: #4CAF50; }
.task-progress-num { font-size: 0.7rem; color: var(--text-muted); white-space: nowrap; }
.task-progress-status { font-size: 1.1rem; }

/* ===== 宠物养成 ===== */
.pet-card{display:flex;align-items:center;gap:16px;background:var(--card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:16px;border:2px solid #EEF2FF}
.pet-avatar-wrap{position:relative;flex-shrink:0}
.pet-avatar{font-size:4.5rem;display:block;animation:petBounce 2s ease-in-out infinite}
.pet-lv-badge{position:absolute;bottom:-4px;right:-8px;background:var(--primary);color:#fff;font-size:.65rem;font-weight:700;padding:2px 10px;border-radius:20px;box-shadow:0 2px 8px rgba(79,70,229,.35)}
@keyframes petBounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.pet-info{flex:1;min-width:0}
.pet-name-row{display:flex;align-items:center;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.pet-name{font-size:1.15rem;font-weight:700;color:var(--text)}
.pet-type-tag{font-size:.7rem;background:#EEF2FF;color:var(--primary);padding:2px 10px;border-radius:12px;font-weight:600}
.pet-stat{display:flex;align-items:center;gap:8px;margin:3px 0;font-size:.8rem;color:var(--text-secondary)}
.pet-bar{flex:1;height:7px;background:#f0f0f0;border-radius:4px;overflow:hidden}
.pet-bar-fill{height:100%;border-radius:4px;transition:width .5s ease}
.pet-exp-fill{background:linear-gradient(90deg,var(--primary),#FFB74D)}
.pet-coins{margin:4px 0;font-size:.85rem;color:var(--text)}
.pet-coins strong{color:var(--primary);font-size:1.05rem}
.pet-actions{display:flex;gap:8px;margin-top:6px;flex-wrap:wrap}
.btn-pet-feed{background:#EEF2FF;color:var(--primary);border:1.5px solid var(--primary);font-weight:600;font-size:.8rem;padding:6px 14px;border-radius:20px;cursor:pointer;transition:all .2s}
.btn-pet-feed:active{background:var(--primary);color:#fff;transform:scale(.95)}
.btn-pet-play{background:#E8F8E9;color:#4CAF50;border:1.5px solid #4CAF50;font-weight:600;font-size:.8rem;padding:6px 14px;border-radius:20px;cursor:pointer;transition:all .2s}
.btn-pet-play:active{background:#4CAF50;color:#fff;transform:scale(.95)}

/* 迷你宠物卡片（首页） */
.mini-pet-card{display:flex;align-items:center;gap:10px;background:linear-gradient(135deg,#F0F4FF,#EEF2FF);border:2px solid #C7D2FE;border-radius:var(--radius-sm);padding:12px 16px;cursor:pointer;text-decoration:none;transition:all .2s;margin-bottom:16px}
.mini-pet-card:active{border-color:var(--primary);transform:scale(.98)}
.mini-pet-avatar{font-size:2rem;animation:petBounce 2.5s ease-in-out infinite}
.mini-pet-info{display:flex;flex-direction:column;gap:1px;flex:1}
.mini-pet-name{font-size:.85rem;font-weight:700;color:var(--text)}
.mini-pet-lv{font-size:.65rem;color:var(--primary);font-weight:600}
.mini-pet-mood{font-size:.75rem}
.mini-pet-arrow{font-size:1.1rem}

/* 选择宠物 */
.pet-select-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:16px 0}
.pet-select-card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:20px 14px;background:var(--card);border:3px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all .2s;text-align:center}
.pet-select-card:active{transform:scale(.97)}
.pet-select-card.selected{border-color:var(--primary);background:#F0F4FF;box-shadow:0 0 0 3px rgba(79,70,229,.2)}
.pet-select-emoji{font-size:3rem}
.pet-select-name{font-size:1rem;font-weight:700;color:var(--text)}
.pet-select-desc{font-size:.75rem;color:var(--text-muted)}
.pet-select-evo{font-size:1.2rem;letter-spacing:3px}
.pet-name-input{margin:14px 0;text-align:center}
.pet-name-input label{display:block;font-weight:600;margin-bottom:6px;color:var(--text)}

/* ===== 段位卡片 ===== */
.rank-card{background:linear-gradient(135deg,#2D2D3F,#1a1a2e);color:#fff;border-radius:var(--radius);padding:18px 20px;margin-bottom:16px;box-shadow:0 6px 24px rgba(0,0,0,.15)}
.rank-main{display:flex;align-items:center;gap:14px;margin-bottom:10px}
.rank-emoji{font-size:2.5rem}
.rank-info{display:flex;flex-direction:column}
.rank-name{font-size:1.25rem;font-weight:700}
.rank-stars-total{font-size:.8rem;color:#ccc}
.rank-next{font-size:.75rem;color:#aaa}
.rank-next strong{color:#FFD54F}
.rank-progress-bar{height:5px;background:rgba(255,255,255,.15);border-radius:3px;margin-top:4px;overflow:hidden}
.rank-progress-fill{height:100%;background:linear-gradient(90deg,#FFD54F,var(--primary));border-radius:3px;transition:width .5s ease}
.rank-max{font-size:.85rem;color:#FFD54F;text-align:center;font-weight:700;animation:pulse 1.5s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}

/* ===== 闯关岛屿 ===== */
.island-card{background:var(--card);border-radius:var(--radius);padding:16px;margin-bottom:14px;box-shadow:var(--shadow);border-top:4px solid var(--island-color,var(--primary))}
.island-header{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.island-icon{font-size:1.8rem}
.island-header h3{font-size:1rem;margin:0;color:var(--text)}
.island-header p{font-size:.75rem;margin:2px 0 0;color:var(--text-muted)}
.island-stages{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px}
.stage-node{display:flex;flex-direction:column;align-items:center;gap:5px;padding:14px 8px;border-radius:var(--radius-sm);text-align:center;transition:all .2s;border:2px solid var(--border);background:#FAFAFA}
.stage-node.available{cursor:pointer;border-color:var(--island-color,var(--primary));background:var(--card)}
.stage-node.available:active{transform:scale(.95)}
.stage-node.cleared{border-color:#4CAF50;background:#f1f8e9}
.stage-node.cleared.stars-3{border-color:#FFD54F;background:#fffde7}
.stage-node.locked{opacity:.4;cursor:not-allowed}
.stage-icon{font-size:1.3rem}
.stage-title{font-size:.75rem;font-weight:600;color:var(--text);line-height:1.3}
.stage-stars{font-size:.7rem;color:var(--text-muted)}
.available .stage-stars{color:var(--primary);font-weight:600}

/* ===== 闯关答题 ===== */
.adventure-play{padding:8px 0}
.adventure-header{display:flex;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}
.adventure-stage-title{font-weight:700;font-size:1rem;color:var(--text);flex:1}
.adventure-progress-text{font-size:.8rem;color:var(--text-muted)}
.adventure-q-card{background:var(--card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:14px}
.adventure-q-num{display:inline-block;background:#EEF2FF;color:var(--primary);font-size:.75rem;font-weight:700;padding:3px 10px;border-radius:10px;margin-bottom:10px}
.adventure-q-text{font-size:1.05rem;font-weight:600;color:var(--text);line-height:1.7;margin-bottom:16px}
.adventure-options{display:flex;flex-direction:column;gap:8px}
.adventure-option{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#FAFAFA;border:2px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all .15s;font-size:.95rem;text-align:left;width:100%;color:var(--text)}
.adventure-option:active:not(:disabled){transform:scale(.98)}
.adventure-option:disabled{cursor:default}
.adventure-option.correct{border-color:#4CAF50!important;background:#E8F5E9!important}
.adventure-option.correct .opt-letter{background:#4CAF50;color:#fff}
.adventure-option.wrong{border-color:#F44336!important;background:#FFEBEE!important}
.adventure-option.wrong .opt-letter{background:#F44336;color:#fff}
.opt-letter{display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:#E0E7FF;font-weight:700;font-size:.8rem;flex-shrink:0}
.adventure-nav-btns{display:flex;justify-content:space-between;align-items:center;margin-top:14px}
.adventure-feedback{background:var(--card);border-radius:var(--radius-sm);padding:14px;margin-top:10px;text-align:center;font-weight:600;box-shadow:var(--shadow)}
.fb-correct{color:#2E7D32}
.fb-wrong{color:#C62828}

/* 闯关结果 */
.adventure-result{text-align:center;padding:16px}
.result-icon{font-size:4.5rem;margin-bottom:10px}
.result-stars{display:flex;justify-content:center;gap:6px;margin:10px 0}
.result-detail{background:var(--card);border-radius:var(--radius-sm);padding:16px;margin:14px 0;box-shadow:var(--shadow)}
.result-detail p{margin:6px 0;font-size:.95rem}
.result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:14px}

/* ===== 响应式 ===== */
@media(max-width:768px){
  .pet-card{flex-direction:column;text-align:center;gap:10px}
  .pet-avatar{font-size:3.5rem}
  .pet-stat{justify-content:center}
  .pet-actions{justify-content:center}
  .island-stages{grid-template-columns:repeat(3,1fr)}
  .pet-select-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .island-stages{grid-template-columns:repeat(2,1fr)}
  .adventure-header{flex-direction:column;align-items:flex-start}
  .adventure-q-text{font-size:.95rem}
  .result-actions{flex-direction:column}
}