:root {
  --bg: #edf3f5;
  --panel: rgba(248, 252, 253, 0.9);
  --line: rgba(112, 134, 145, 0.2);
  --text: #233641;
  --muted: #617784;
  --accent: #6e8f9d;
  --accent-soft: #dce8ed;
  --success: #2f7a4a;
  --danger: #a1462f;
  --shadow: 0 18px 42px rgba(78, 103, 117, 0.12);
  --radius: 16px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-size: 13px;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(174, 201, 214, 0.34), transparent 28%),
    radial-gradient(circle at right, rgba(132, 161, 174, 0.16), transparent 22%),
    linear-gradient(180deg, #f2f7f8 0%, #e5eef1 100%);
}
button, input, textarea, select { font: inherit; }
body.auth-pending .app-shell,
body.auth-pending .mobile-sidebar-toggle {
  display: none;
}
body.auth-ready .login-screen {
  display: none;
}
.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}
.login-panel {
  width: min(100%, 360px);
  display: grid;
  gap: 14px;
  padding: 22px;
  border-radius: var(--radius);
  backdrop-filter: blur(16px);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.login-logo {
  width: min(100%, 272px);
  height: auto;
  justify-self: center;
  display: block;
}
.login-panel h1 {
  margin: 0;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 25px;
  letter-spacing: 0;
}
.logout-button {
  width: 100%;
}
.app-shell { display: grid; grid-template-columns: 256px minmax(0, 1fr); gap: 14px; padding: 14px; }
.mobile-sidebar-toggle,
.mobile-sidebar-backdrop {
  display: none;
}
.sidebar, .card { backdrop-filter: blur(16px); background: var(--panel); border: 1px solid var(--line); box-shadow: var(--shadow); }
.sidebar {
  position: sticky;
  top: 14px;
  height: calc(100vh - 28px);
  padding: 16px;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}
.sidebar > * {
  flex-shrink: 0;
}
.brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: block;
  flex: 0 0 auto;
}
.brand h1 {
  margin: 2px 0 0;
  font-family: "Avenir Next", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 23px;
  letter-spacing: 0;
}
.brand h1, .daily-line h2, .panel-head h3, .card h4 { letter-spacing: 0.01em; }
.panel-head h3, .card h4 { font-family: Georgia, "Times New Roman", serif; }
.daily-line h2 {
  margin: 3px 0 0;
  font-size: 24px;
  font-weight: 800;
  line-height: 1.18;
}
.panel-head h3 { margin: 2px 0 0; font-size: 21px; }
.card h4 { margin: 0 0 12px; font-size: 16px; }
.eyebrow { margin: 0; color: var(--accent); text-transform: uppercase; letter-spacing: 0.14em; font-size: 11px; font-weight: 700; }
.subtitle, .history-item p, label, .summary-card label, .feedback-box, .sentence-zh, .prompt-chip, .status-box { color: var(--muted); }
.nav-tabs { display: grid; gap: 6px; }
.nav-tab, button {
  border: none;
  cursor: pointer;
  transition: transform 140ms ease, background 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
}
.nav-tab {
  text-align: left;
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(255,255,255,0.56);
  color: var(--text);
  font-weight: 600;
  border: 1px solid transparent;
}
.nav-tab:hover {
  transform: translateX(2px);
  background: rgba(220, 232, 237, 0.72);
}
.nav-tab:active {
  transform: scale(0.98);
}
.nav-tab.active {
  background: linear-gradient(135deg, #86a5b2 0%, #6e8f9d 100%);
  color: white;
  box-shadow: 0 10px 22px rgba(110, 143, 157, 0.28);
  border-color: rgba(110, 143, 157, 0.32);
}
button:not(.ghost) {
  background: linear-gradient(135deg, #86a5b2 0%, #6e8f9d 100%);
  color: white;
}
button {
  padding: 9px 12px;
  border-radius: 11px;
  font-weight: 700;
}
button:hover {
  transform: translateY(-1px);
}
button:active {
  transform: scale(0.98);
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}
button.ghost { background: rgba(255,255,255,0.65); color: var(--text); border: 1px solid var(--line); }
.summary-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 8px; }
.summary-grid div, .status-box {
  padding: 10px; border-radius: 12px; background: rgba(255,255,255,0.62); border: 1px solid var(--line);
}
.summary-grid span { display: block; font-size: 20px; font-weight: 800; }
.status-box { margin-top: 8px; line-height: 1.4; font-size: 12px; }
.main-panel { display: grid; gap: 14px; }
.daily-line {
  padding: 4px 2px 2px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.daily-line-copy {
  min-width: 0;
}
.daily-line-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}
.tab-panel { display: none; gap: 14px; }
.tab-panel.active { display: grid; }
.grid { display: grid; gap: 14px; }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { padding: 15px; border-radius: var(--radius); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.form-grid.compact-form {
  grid-template-columns: 1fr;
}
.form-grid .full { grid-column: 1 / -1; }
label { display: grid; gap: 5px; font-size: 12px; font-weight: 600; }
.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; }
input, textarea, select { width: 100%; border-radius: 11px; border: 1px solid var(--line); background: rgba(255,255,255,0.76); padding: 9px 10px; color: var(--text); resize: vertical; }
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: rgba(110, 143, 157, 0.45);
  box-shadow: 0 0 0 3px rgba(110, 143, 157, 0.14);
}
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.history-list { display: grid; gap: 8px; }
.collapsible-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.collapsible-head h4 { margin: 0; }
.collapsible-body { display: grid; gap: 10px; }
.collapsible-body[hidden] { display: none; }
.collapsible-card.is-collapsed .collapsible-head { margin-bottom: 0; }
.history-item { padding: 12px; border-radius: 13px; background: rgba(255,255,255,0.68); border: 1px solid var(--line); }
.history-item.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(110,143,157,0.14); }
.history-item.nested-card {
  padding: 10px;
  border-radius: 12px;
  background: rgba(255,255,255,0.56);
}
.history-item h5, .history-item p { margin: 0; }
.history-item h5 + p, .history-item p + p { margin-top: 5px; }
.history-item strong.action-title { display: block; font-size: 15px; margin-bottom: 5px; }
.daily-task-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.daily-task.done {
  border-color: rgba(47,122,74,0.24);
  background: rgba(238, 248, 242, 0.72);
}
.stat-item {
  background: linear-gradient(180deg, rgba(255,255,255,0.86), rgba(220,232,237,0.64));
}
.stat-number {
  color: var(--text);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.1;
}
.stat-number.small {
  font-size: 16px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.stats-grid div {
  padding: 9px;
  border-radius: 12px;
  background: rgba(255,255,255,0.62);
  border: 1px solid var(--line);
}
.stats-grid p {
  margin-top: 5px;
}
.review-session-card {
  display: grid;
  gap: 10px;
}
.review-session-metrics {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.review-activity-chart {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
  align-items: end;
  min-height: 106px;
  margin-top: 8px;
}
.review-activity-day {
  display: grid;
  gap: 5px;
  justify-items: center;
  align-items: end;
  color: var(--muted);
  font-size: 11px;
  min-width: 0;
}
.review-activity-day strong {
  color: var(--text);
  font-size: 12px;
}
.review-activity-bar {
  width: 100%;
  max-width: 32px;
  min-height: 8px;
  border-radius: 8px 8px 3px 3px;
  background: linear-gradient(180deg, var(--accent), rgba(110,143,157,0.35));
}
.step-list { display: grid; gap: 6px; }
.step {
  display: flex; gap: 9px; align-items: start; padding: 9px 10px; border-radius: 12px;
  background: rgba(255,255,255,0.62); border: 1px solid var(--line);
}
.step-index {
  width: 22px; height: 22px; border-radius: 999px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--text); font-weight: 800; flex: 0 0 auto;
  font-size: 11px;
}
.step.done .step-index {
  background: rgba(47,122,74,0.18);
  color: var(--success);
}
.step-body h5, .step-body p { margin: 0; }
.step-body h5 { font-size: 13px; }
.step-body p { margin-top: 3px; color: var(--muted); font-size: 12px; }
.result-box {
  white-space: pre-wrap; min-height: 100px; padding: 10px 12px; border-radius: 13px; background: rgba(255,255,255,0.68);
  border: 1px solid var(--line); line-height: 1.65; overflow: auto;
}
.teaching-result {
  display: grid;
  gap: 8px;
  white-space: normal;
}
.collocation-list {
  display: grid;
  gap: 8px;
}
.collocation-item {
  display: grid;
  gap: 3px;
  padding: 8px 10px;
  border: 1px solid rgba(110, 143, 157, 0.18);
  border-radius: 10px;
  background: rgba(255,255,255,0.54);
}
.collocation-item strong {
  color: var(--text);
  font-size: 13px;
}
.collocation-item span {
  color: var(--muted);
  font-size: 12px;
}
.speech-list {
  display: grid;
  gap: 7px;
}
.speech-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}
.speech-row p {
  flex: 1 1 220px;
  margin: 0;
  min-width: 0;
}
.speech-button {
  flex: 0 0 auto;
  white-space: nowrap;
}
.result-box.compact { min-height: 0; }
.prompt-chip { display: inline-flex; width: fit-content; padding: 4px 8px; border-radius: 999px; background: var(--accent-soft); font-size: 10px; font-weight: 700; }
.sentence-zh { font-size: 18px; color: var(--text); line-height: 1.4; }
.sentence-card-detail {
  margin: 8px 0;
}
.sentence-pattern-card {
  display: grid;
  gap: 8px;
  padding: 10px;
  border-radius: 13px;
  background: rgba(255,255,255,0.58);
  border: 1px solid rgba(110,143,157,0.2);
}
.sentence-reveal {
  display: grid;
  gap: 3px;
  padding: 8px 9px;
  border-radius: 12px;
  background: rgba(248,252,253,0.78);
  border: 1px solid rgba(110,143,157,0.16);
}
.sentence-reveal span {
  color: var(--accent);
  font-size: 10px;
  font-weight: 800;
}
.sentence-reveal p {
  margin: 0;
  line-height: 1.45;
  color: var(--text);
}
.sentence-reveal.locked p {
  color: var(--muted);
}
.feedback-box { min-height: 66px; padding: 10px 12px; border-radius: 13px; background: rgba(255,255,255,0.6); border: 1px solid var(--line); line-height: 1.5; }
.feedback-box.success { color: var(--success); border-color: rgba(47,122,74,0.2); }
.feedback-box.error { color: var(--danger); border-color: rgba(161,70,47,0.2); }
.route-pill {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  margin: 0 6px 6px 0;
  padding: 3px 8px;
  border-radius: 8px;
  background: rgba(67, 96, 117, 0.08);
  color: var(--text);
  font-size: 12px;
}
.sentence-diff {
  margin-top: 0;
}
.sentence-diff-card {
  display: grid;
  gap: 9px;
  padding: 10px 12px;
  border-radius: 13px;
  background: rgba(255,255,255,0.68);
  border: 1px solid rgba(110,143,157,0.2);
}
.sentence-diff-card.is-correct {
  border-color: rgba(47,122,74,0.22);
  background: rgba(238,248,242,0.74);
}
.diff-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.diff-head h5,
.diff-summary {
  margin: 0;
}
.diff-summary {
  color: var(--muted);
  line-height: 1.45;
}
.diff-section {
  display: grid;
  gap: 5px;
}
.diff-label {
  color: var(--text);
  font-size: 11px;
  font-weight: 800;
}
.diff-tokens {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  max-height: 76px;
  overflow-y: auto;
  padding-right: 2px;
}
.diff-token {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: rgba(220,232,237,0.58);
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}
.diff-token.ok {
  background: rgba(47,122,74,0.1);
  color: var(--success);
}
.diff-token.missing {
  border-color: rgba(161,70,47,0.24);
  background: rgba(253,238,232,0.82);
  color: var(--danger);
}
.diff-token.extra {
  border-color: rgba(166,117,42,0.28);
  background: rgba(250,239,214,0.84);
  color: #8a5b1f;
}
.diff-token.moved {
  border-color: rgba(110,143,157,0.34);
  background: rgba(220,232,237,0.9);
  color: var(--accent);
}
.diff-empty {
  color: var(--muted);
  font-size: 12px;
}
.diff-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 11px;
}
.diff-legend span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.legend-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: rgba(110,143,157,0.38);
}
.legend-dot.ok { background: var(--success); }
.legend-dot.missing { background: var(--danger); }
.legend-dot.extra { background: #b98231; }
.legend-dot.moved { background: var(--accent); }
.sentence-analysis {
  margin-top: 8px;
}
.sentence-analysis .history-item {
  padding: 10px 12px;
}
.sentence-analysis h5 {
  margin-bottom: 4px;
}
.sentence-analysis p {
  margin: 4px 0;
}
.sentence-analysis .tag-row {
  padding-bottom: 2px;
}
.analysis-list {
  display: grid;
  gap: 4px;
  margin-top: 6px;
}
.sentence-analysis .analysis-list p {
  padding: 7px 9px;
  border-radius: 12px;
  background: rgba(220,232,237,0.62);
  line-height: 1.45;
}
.sentence-practice-grid {
  align-items: start;
  grid-template-columns: minmax(0, 1fr);
}
.sentence-progress-grid {
  display: grid;
  gap: 14px;
  align-items: start;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
}
.sentence-progress-stack {
  display: grid;
  gap: 14px;
  min-width: 0;
}
.sentence-today-card {
  min-width: 0;
}
.sentence-today-card #sentence-today-learned {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.sentence-practice-grid > .card {
  height: auto;
}
.sentence-dictation-card {
  display: flex;
  flex-direction: column;
}
.sentence-dictation-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 14px;
  align-items: start;
}
.sentence-dictation-compose,
.sentence-dictation-result {
  min-width: 0;
}
.sentence-dictation-compose {
  display: grid;
  gap: 10px;
}
.sentence-dictation-result {
  display: grid;
  gap: 10px;
}
.sentence-settings-card {
  display: flex;
  flex-direction: column;
}
.sentence-settings-note {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding-top: 0;
}
.sentence-bank-item h5 {
  margin: 0;
}
.sentence-bank-item p {
  line-height: 1.45;
}
.sentence-bank-head {
  margin-bottom: 10px;
}
.collapsible-card.is-collapsed .sentence-bank-head {
  margin-bottom: 0;
}
.sentence-bank-head h4 {
  margin: 0;
}
.sentence-bank-tools {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 8px;
  margin-bottom: 12px;
}
.pagination-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}
.selectable { cursor: pointer; }
.selectable.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(110,143,157,0.14); }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.action-card {
  padding: 13px; border-radius: 14px; background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(220,232,237,0.9));
  border: 1px solid rgba(110,143,157,0.22);
}
.action-row {
  display: flex; flex-wrap: wrap; gap: 7px; margin-top: 10px;
}
.mini-button {
  display: inline-flex; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--line);
  background: rgba(255,255,255,0.82); cursor: pointer; font-size: 12px; font-weight: 700;
}
.danger-button {
  color: var(--danger);
  border-color: rgba(161,70,47,0.24);
}
.admin-user-card.is-disabled {
  opacity: 0.72;
}
.admin-stats {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 8px;
}
.admin-stats span {
  display: block;
  color: var(--text);
  font-size: 18px;
  font-weight: 800;
}
.quota-panel {
  margin-top: 12px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,0.58);
}
.quota-panel h6 {
  margin: 0;
  font-size: 13px;
}
.quota-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin: 8px 0;
}
.quota-grid label {
  display: grid;
  gap: 4px;
  font-size: 12px;
  font-weight: 700;
}
.quota-grid input {
  width: 100%;
  padding: 7px 8px;
}
.quota-grid small {
  color: var(--muted);
  font-weight: 600;
}
.tag {
  display: inline-flex; padding: 3px 8px; border-radius: 999px; background: rgba(220,232,237,0.82);
  color: var(--text); font-size: 12px; font-weight: 600;
}
.error-tag-row {
  margin-top: 5px;
}
.tag.error-tag {
  background: rgba(253,238,232,0.88);
  color: var(--danger);
  border: 1px solid rgba(161,70,47,0.18);
}
.word-network-core {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  margin-bottom: 10px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(110,143,157,0.14), rgba(174,201,214,0.22));
  border: 1px solid rgba(110,143,157,0.22);
  color: var(--text);
  font-size: 19px;
  font-weight: 800;
  text-transform: lowercase;
}
.word-network-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.network-cluster {
  padding: 10px;
  border-radius: 12px;
  background: rgba(255,255,255,0.62);
  border: 1px solid var(--line);
}
.network-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.network-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.network-node {
  display: inline-flex;
  padding: 5px 8px;
  border-radius: 999px;
  background: rgba(220,232,237,0.9);
  color: var(--text);
  font-size: 11px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
}
.network-node.active {
  background: rgba(110,143,157,0.16);
  border-color: rgba(110,143,157,0.3);
  color: var(--accent);
}
.trend-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.trend-badge {
  display: inline-flex;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(110,143,157,0.12);
  color: var(--accent);
  font-size: 10px;
  font-weight: 700;
}
.progress-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.progress-track {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: rgba(110,143,157,0.12);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(135deg, #86a5b2 0%, #6e8f9d 100%);
}
.custom-panel {
  margin-top: 12px;
  padding: 12px;
  border-radius: 13px;
  background: rgba(255,255,255,0.56);
  border: 1px solid var(--line);
}
.hidden {
  display: none;
}
.mobile-sidebar-backdrop.hidden {
  display: none;
}
.muted-note { color: var(--muted); font-size: 11px; }
.sidebar::-webkit-scrollbar {
  width: 8px;
}
.sidebar::-webkit-scrollbar-thumb {
  background: rgba(110, 143, 157, 0.28);
  border-radius: 999px;
}
.sidebar::-webkit-scrollbar-track {
  background: transparent;
}
@media (max-width: 1100px) {
  .app-shell { grid-template-columns: 1fr; }
  .mobile-sidebar-toggle {
    position: sticky;
    top: 10px;
    z-index: 40;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    margin: 10px 0 0 10px;
    padding: 0;
    box-shadow: var(--shadow);
  }
  .mobile-toggle-icon {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 18px;
  }
  .mobile-toggle-icon span {
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: var(--text);
    transition: transform 140ms ease, opacity 140ms ease;
  }
  body.mobile-sidebar-open .mobile-toggle-icon span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  body.mobile-sidebar-open .mobile-toggle-icon span:nth-child(2) {
    opacity: 0;
  }
  body.mobile-sidebar-open .mobile-toggle-icon span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
  .mobile-sidebar-backdrop {
    position: fixed;
    inset: 0;
    z-index: 34;
    display: block;
    background: rgba(20, 34, 41, 0.28);
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 35;
    width: min(80vw, 288px);
    height: 100vh;
    border-radius: 0 18px 18px 0;
    transform: translateX(-108%);
    transition: transform 180ms ease;
  }
  body.mobile-sidebar-open {
    overflow: hidden;
  }
  body.mobile-sidebar-open .sidebar {
    transform: translateX(0);
  }
  body.mobile-sidebar-open .mobile-sidebar-backdrop {
    display: block;
  }
  .two-col, .form-grid { grid-template-columns: 1fr; }
  .sentence-progress-grid { grid-template-columns: 1fr; }
  .sentence-today-card #sentence-today-learned { grid-template-columns: 1fr; }
  .sentence-dictation-layout { grid-template-columns: 1fr; }
  .sentence-bank-tools { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .review-session-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .admin-stats,
  .quota-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .word-network-grid { grid-template-columns: 1fr; }
  .daily-task-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .daily-line { align-items: flex-start; flex-direction: column; }
  .main-panel {
    padding-bottom: 14px;
  }
}
@media (max-width: 640px) {
  .daily-task-grid { grid-template-columns: 1fr; }
}