:root {
  --bg: #f4f6fa;
  --surface: #fff;
  --ink: #182438;
  --muted: #637189;
  --line: #e1e6ef;
  --blue: #365fe8;
  --blue-light: #eef2ff;
  --green: #16856c;
  --amber: #a7640b;
  --red: #be4053;
  --radius: 16px;
  --sidebar: #132033;
}
* {
  box-sizing: border-box;
}
html {
  font-size: 16px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font:
    1rem/1.7 -apple-system,
    BlinkMacSystemFont,
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
}
a {
  color: var(--blue);
  text-underline-offset: 4px;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
input,
select,
textarea {
  touch-action: manipulation;
}
button {
  cursor: pointer;
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}
:focus-visible {
  outline: 3px solid #8eabff;
  outline-offset: 3px;
}
.app-shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  min-height: 100vh;
}
.sidebar {
  background: var(--sidebar);
  padding: 32px 22px;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  color: white;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 650;
}
.brand-mark {
  display: grid;
  place-content: center;
  width: 42px;
  height: 42px;
  background: #365fe8;
  border-radius: 12px;
  font-size: 24px;
  position: relative;
}
.brand-mark > span {
  position: absolute;
  right: 6px;
  bottom: 5px;
  color: #a4baff;
}
.brand small {
  display: block;
  color: #a6b3c8;
  font-size: 0.8rem;
  font-weight: 400;
  margin-top: 2px;
}
.nav-caption {
  color: #8e9fb7;
  font-size: 0.8rem;
  margin: 44px 12px 12px;
}
.nav-link {
  display: block;
  color: #aebbd0;
  text-decoration: none;
  padding: 12px 16px;
  margin-bottom: 6px;
  border-radius: 9px;
  font-weight: 550;
}
.nav-link.active {
  background: #2c4163;
  color: white;
}
.nav-link:hover {
  background: #243752;
  color: white;
}
.sidebar-bottom {
  margin-top: auto;
  padding: 30px 10px 0;
}
.goal-label {
  color: #9babc3;
  font-size: 0.8rem;
  display: block;
}
.sidebar-bottom strong {
  font-size: 0.95rem;
}
.sidebar-bottom p {
  color: #8d9eb7;
  font-size: 0.9rem;
  line-height: 1.8;
}
.sidebar-bottom a {
  color: #becdff;
  font-size: 0.85rem;
}
main {
  min-width: 0;
}
.topbar {
  height: 76px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  background: #fff;
  font-size: 0.9rem;
}
.local-badge {
  color: var(--muted);
  font-size: 0.8rem;
  background: #f3f5f9;
  padding: 5px 12px;
  border-radius: 30px;
}
.content {
  max-width: 1320px;
  margin: auto;
  padding: 38px 40px 64px;
}
.page-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}
.eyebrow {
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 1.4px;
}
h1 {
  font-size: 2rem;
  line-height: 1.3;
  letter-spacing: -0.6px;
  margin: 8px 0 12px;
}
h2 {
  font-size: 1.35rem;
  line-height: 1.5;
  margin: 10px 0 16px;
}
h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}
p {
  margin: 8px 0 14px;
}
.muted {
  color: var(--muted);
  margin: 0;
}
.button {
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 10px 17px;
  background: #fff;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 550;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
}
.button:hover {
  border-color: #9db0dc;
  background: #f8faff;
}
.button.primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.button.primary:hover {
  background: #234ad0;
}
.button.ghost {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
}
.button.small {
  padding: 6px 12px;
  font-size: 0.85rem;
}
.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}
.stat {
  background: #fff;
  border: 1px solid var(--line);
  padding: 22px 24px;
  border-radius: var(--radius);
}
.stat > span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}
.stat > strong {
  display: block;
  font-size: 2rem;
  line-height: 1.5;
  margin-top: 8px;
  letter-spacing: -0.7px;
}
.stat small {
  color: #94a0b2;
  font-size: 0.95rem;
  font-weight: 400;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.today-card {
  border-top: 3px solid var(--blue);
}
.task-preview {
  color: var(--muted);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.notice {
  font-size: 0.9rem;
  border: 1px solid #d6e1ff;
  background: #f0f4ff;
  border-radius: 10px;
  padding: 13px 16px;
  line-height: 1.7;
}
.warning {
  background: #fff7e7;
  border-color: #f0ddb5;
  color: #84521a;
}
#storage-warning {
  margin: 20px 40px 0;
}
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #152c45;
  color: #fff;
  padding: 10px 20px;
  border-radius: 10px;
  box-shadow: 0 8px 30px #14243a22;
  z-index: 10;
  font-size: 0.9rem;
  max-width: 90vw;
  display: none;
}
#toast.visible {
  display: block;
}
[hidden] {
  display: none !important;
}
@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 190px minmax(0, 1fr);
  }
  .sidebar {
    padding: 24px 14px;
  }
  .brand {
    font-size: 0.9rem;
  }
  .brand-mark {
    width: 35px;
    height: 35px;
  }
  .content {
    padding: 28px 24px;
  }
  .topbar {
    padding: 0 24px;
  }
  .stat {
    padding: 18px;
  }
}
@media (max-width: 720px) {
  .app-shell {
    display: block;
  }
  .sidebar {
    position: static;
    height: auto;
    padding: 16px 18px;
  }
  .brand small,
  .nav-caption,
  .sidebar-bottom {
    display: none;
  }
  .brand {
    font-size: 1rem;
  }
  .sidebar nav {
    display: flex;
    gap: 6px;
    margin-top: 18px;
  }
  .nav-link {
    flex: 1;
    text-align: center;
    padding: 8px 5px;
    font-size: 0.85rem;
    margin: 0;
  }
  .topbar {
    height: 54px;
    padding: 0 20px;
  }
  .content {
    padding: 24px 16px 48px;
  }
  .page-heading {
    align-items: flex-start;
    gap: 14px;
  }
  h1 {
    font-size: 1.65rem;
  }
  .stats {
    gap: 9px;
  }
  .stat {
    padding: 13px 10px;
  }
  .stat > span {
    font-size: 0.75rem;
  }
  .stat > strong {
    font-size: 1.5rem;
  }
  .stat small {
    font-size: 0.75rem;
  }
  .card {
    padding: 20px;
  }
  .button {
    padding: 9px 13px;
  }
  .page-heading .button {
    white-space: nowrap;
  }
  .local-badge {
    font-size: 0.75rem;
  }
  #storage-warning {
    margin: 16px;
  }
}
.nav-link > span {
  font-size: 0.75rem;
  color: #8094b4;
  margin-right: 14px;
}
.row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.spread {
  justify-content: space-between;
}
.card-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.card-heading h2 {
  margin: 0;
}
.compact {
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 12px 0;
}
.tag {
  display: inline-block;
  border: 1px solid var(--line);
  background: #f7f8fb;
  padding: 4px 10px;
  border-radius: 6px;
  white-space: nowrap;
  font-size: 0.8rem;
  color: var(--muted);
}
.tag.blue {
  color: #2b51cd;
  background: #f0f4ff;
  border-color: #dbe4ff;
}
.learn-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 1fr);
  gap: 24px;
  align-items: start;
}
.learning-aside {
  display: grid;
  gap: 20px;
}
.tasks {
  margin: 18px 0 26px;
}
.task {
  display: flex;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}
.task:last-child {
  border-bottom: 0;
}
.task input {
  width: 20px;
  height: 20px;
  accent-color: var(--blue);
  flex-shrink: 0;
  margin-top: 4px;
}
.task-title {
  font-weight: 650;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}
.task-title small {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.8rem;
}
.task-text {
  font-size: 0.95rem;
  line-height: 1.8;
  display: block;
  color: #48586d;
}
.task.checked .task-title {
  color: var(--green);
}
.task.checked input {
  accent-color: var(--green);
}
.field-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin: 20px 0 8px;
}
input:not([type="checkbox"]),
select,
textarea {
  border: 1px solid #cfd8e7;
  border-radius: 9px;
  padding: 11px 13px;
  width: 100%;
  background: #fff;
  color: var(--ink);
  outline-offset: 2px;
}
textarea {
  resize: vertical;
  line-height: 1.8;
  min-height: 96px;
}
input[type="checkbox"] {
  accent-color: var(--blue);
}
.save-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
}
.save-row .muted {
  font-size: 0.8rem;
}
.day-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}
.day {
  position: relative;
  border: 1px solid var(--line);
  background: #f7f9fc;
  min-height: 39px;
  border-radius: 8px;
  color: #516079;
  font-size: 0.9rem;
}
.day.selected {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.day.done:not(.selected) {
  background: #e9f7f2;
  color: #167355;
  border-color: #c4e8d8;
}
.day.done:after {
  content: "✓";
  position: absolute;
  right: 2px;
  bottom: -3px;
  font-size: 10px;
}
.legend {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 12px 0;
}
.resource {
  display: block;
  text-decoration: none;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.resource:last-child {
  border: 0;
  padding-bottom: 0;
}
.resource strong {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.6;
  display: block;
}
.resource span {
  display: block;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--muted);
  margin-top: 5px;
}
.question-strip {
  margin-top: 24px;
}
.question-row {
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 17px 0;
  color: var(--ink);
}
.question-row:last-child {
  border: 0;
}
.question-row:hover {
  color: var(--blue);
}
.qid {
  color: var(--blue);
  font-size: 0.85rem;
  font-weight: 650;
}
.arrow {
  margin-left: auto;
}
.practice-layout {
  display: grid;
  grid-template-columns: 285px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}
.question-bank {
  padding: 20px;
  position: sticky;
  top: 20px;
}
.question-bank .field-label {
  margin-top: 0;
}
.filter-row {
  display: grid;
  grid-template-columns: 85px minmax(0, 1fr);
  gap: 8px;
  margin-top: 10px;
}
.filter-row select {
  font-size: 0.8rem;
  padding: 9px 4px;
}
.check-label {
  display: flex;
  align-items: flex-start;
  gap: 5px;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 14px 0;
}
.check-label input {
  margin-top: 6px;
}
.question-list {
  max-height: 580px;
  overflow: auto;
  padding-right: 3px;
}
.bank-item {
  display: block;
  text-align: left;
  width: 100%;
  background: #fff;
  border: 1px solid transparent;
  padding: 13px;
  border-radius: 9px;
  line-height: 1.7;
  color: #4c5a70;
  font-size: 0.875rem;
  margin-bottom: 5px;
}
.bank-item > span {
  display: flex;
  justify-content: space-between;
  margin-bottom: 4px;
}
.bank-item b {
  font-size: 0.8rem;
  color: #7d8ba1;
}
.bank-item small {
  font-size: 0.75rem;
}
.bank-item:hover {
  background: #f5f7fc;
}
.bank-item.selected {
  background: #edf2ff;
  border-color: #dbe3fb;
  color: #2548bb;
}
.bank-item.selected b {
  color: #365fe8;
}
.answer-workspace {
  min-width: 0;
}
.question-title {
  font-size: 1.4rem;
  margin: 22px 0 14px;
  line-height: 1.6;
}
.answer-card .field-label {
  margin-top: 24px;
}
.answer-card textarea {
  background: #fcfdff;
  min-height: 235px;
}
.answer-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 6px 0 18px;
}
.answer-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.reference {
  padding: 22px;
  background: #f5f7fc;
  margin-top: 24px;
  border-radius: 10px;
}
.reference p {
  font-size: 0.95rem;
}
.reference small {
  font-size: 0.8rem;
  color: var(--muted);
}
.feedback {
  margin-top: 24px;
  border-top: 3px solid var(--green);
  scroll-margin-top: 20px;
}
.score-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.score-heading h2 {
  font-size: 1.15rem;
}
.score-number {
  font-size: 3rem;
  color: var(--blue);
  font-weight: 650;
  line-height: 1.1;
  white-space: nowrap;
}
.score-number small {
  display: block;
  font-size: 0.9rem;
  font-weight: 400;
  text-align: right;
  color: var(--muted);
  margin-top: 10px;
}
.dimensions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 28px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 20px 0;
}
.dimensions span {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
}
.dimensions p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 6px 0 0;
}
.dimensions progress {
  width: 100%;
  height: 6px;
  accent-color: var(--blue);
  border: 0;
  border-radius: 8px;
  display: block;
  margin-top: 9px;
}
progress::-webkit-progress-bar {
  background: #e9edf5;
  border-radius: 8px;
}
progress::-webkit-progress-value {
  background: var(--blue);
  border-radius: 8px;
}
.feedback-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.feedback-list {
  padding-left: 22px;
  margin: 10px 0 20px;
  font-size: 0.95rem;
}
.feedback-list li {
  margin: 7px 0;
}
.corrections {
  background: #fff5ef;
  border-radius: 10px;
  padding: 18px;
  margin: 16px 0;
}
blockquote {
  border-left: 3px solid #adc0ef;
  margin: 14px 0;
  padding: 6px 18px;
  font-size: 0.9rem;
  background: #f8faff;
}
blockquote span {
  color: var(--muted);
}
details summary {
  cursor: pointer;
  color: #3556aa;
  font-weight: 600;
  padding: 12px 0;
}
details p {
  font-size: 0.95rem;
}
.followup {
  padding: 18px 20px;
  border-radius: 10px;
  background: #f0f4ff;
  margin: 20px 0;
}
.followup p {
  margin-bottom: 0;
}
.preserve {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.settings-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 24px;
  align-items: start;
}
.settings-grid > div {
  display: grid;
  gap: 24px;
}
.settings-grid form button {
  margin: 20px 0 6px;
}
.settings-grid form .row {
  gap: 10px;
}
.schedule-note {
  padding-top: 20px;
  margin-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}
.schedule-note p {
  color: var(--muted);
  margin-bottom: 0;
}
.rubric-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}
.weak-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.history-list {
  margin-top: 22px;
}
.attempt {
  margin: 14px 0;
}
.attempt > summary {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--ink);
  padding: 0;
  list-style: none;
}
.attempt > summary::-webkit-details-marker {
  display: none;
}
.attempt > summary > span:nth-child(2) {
  flex: 1;
}
.attempt > summary strong {
  font-size: 0.95rem;
  font-weight: 600;
}
.attempt > summary small {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
  margin-top: 5px;
}
.history-score {
  font-size: 1.65rem;
  color: var(--blue);
  width: 46px;
  font-weight: 600;
  flex-shrink: 0;
}
.attempt[open] > summary {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}
.original-answer {
  padding: 18px;
  background: #f7f9fc;
  border-radius: 10px;
}
.attempt .feedback {
  margin-bottom: 20px;
}
.empty {
  text-align: center;
  padding: 45px 20px;
}
.empty .button {
  margin-top: 25px;
}
.empty-icon {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  background: #eaf0ff;
  color: var(--blue);
  border-radius: 15px;
  font-size: 28px;
  margin: 0 auto 20px;
}
.login-wrap {
  max-width: 480px;
  margin: 70px auto;
}
.login-wrap button {
  margin-top: 20px;
  width: 100%;
}
.login-wrap h1 {
  font-size: 1.7rem;
}
.notice button {
  margin-top: 10px;
}
.history-list .feedback .score-number {
  font-size: 2.4rem;
}
.card p,
.card li {
  overflow-wrap: anywhere;
}
@media (min-width: 1500px) {
  .content {
    padding-top: 44px;
  }
  .question-list {
    max-height: 650px;
  }
}
@media (max-width: 1180px) {
  .learn-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
  }
  .practice-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 18px;
  }
  .answer-card {
    padding: 23px;
  }
  .answer-actions .button {
    font-size: 0.85rem;
    padding: 10px 12px;
  }
  .task-title {
    flex-wrap: wrap;
  }
  .card-heading {
    align-items: flex-start;
  }
  .card-heading .muted {
    font-size: 0.8rem;
  }
  .settings-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 940px) {
  .learn-grid {
    grid-template-columns: 1fr;
  }
  .learning-aside {
    grid-template-columns: 1fr 1fr;
  }
  .practice-layout {
    grid-template-columns: 1fr;
  }
  .question-bank {
    position: static;
  }
  .question-list {
    max-height: 200px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }
  .filter-row {
    grid-template-columns: 1fr 2fr;
  }
  .feedback-columns {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .topbar .row {
    gap: 6px;
  }
}
@media (max-width: 720px) {
  .nav-link > span {
    display: none;
  }
  .sidebar nav {
    gap: 4px;
  }
  .nav-link {
    font-size: 0.875rem;
    white-space: nowrap;
  }
  .sidebar {
    padding: 16px 12px;
  }
  .brand {
    margin-left: 6px;
  }
  .learning-aside {
    grid-template-columns: 1fr;
  }
  .page-heading {
    flex-wrap: wrap;
    gap: 18px;
  }
  .page-heading .muted {
    font-size: 0.95rem;
  }
  .page-heading > .row {
    gap: 8px;
  }
  .stat > span {
    font-size: 0.8125rem;
    line-height: 1.6;
  }
  .stat > strong {
    font-size: 1.6rem;
  }
  .stat small {
    font-size: 0.8rem;
  }
  .stats {
    gap: 8px;
  }
  .learn-grid,
  .practice-layout {
    gap: 18px;
  }
  .day {
    min-height: 40px;
  }
  .question-list {
    grid-template-columns: 1fr 1fr;
    max-height: 220px;
  }
  .bank-item {
    padding: 10px;
    font-size: 0.875rem;
  }
  .answer-meta {
    flex-direction: column;
    gap: 4px;
  }
  .question-title {
    font-size: 1.2rem;
  }
  .task-text {
    font-size: 0.9375rem;
  }
  .save-row {
    align-items: flex-start;
    flex-direction: column;
  }
  .dimensions {
    gap: 18px;
    grid-template-columns: 1fr;
  }
  .score-heading {
    align-items: flex-start;
    gap: 14px;
  }
  .score-number {
    font-size: 2.4rem;
  }
  .card-heading {
    flex-wrap: wrap;
  }
  .feedback {
    padding: 20px;
  }
  .attempt {
    padding: 18px;
  }
  .attempt > summary {
    gap: 12px;
  }
  .attempt > summary > .tag {
    display: none;
  }
  .history-score {
    width: 35px;
    font-size: 1.4rem;
  }
  .attempt .feedback {
    padding: 15px;
  }
  .login-wrap {
    margin: 25px auto;
  }
  .question-row {
    gap: 10px;
  }
  .topbar {
    padding: 0 16px;
  }
  .local-badge {
    font-size: 0.8125rem;
  }
  .brand small {
    display: none;
  }
  .eyebrow {
    font-size: 0.8rem;
  }
  .settings-grid .card {
    padding: 22px;
  }
  .row.spread {
    align-items: flex-start;
  }
}

.bank-toggle {
  display: none;
}
@media (max-width: 940px) {
  .bank-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    width: 100%;
    background: transparent;
    border: 0;
    padding: 2px;
    color: var(--ink);
    font-size: 0.875rem;
    font-weight: 600;
  }
  .bank-toggle > span:last-child {
    color: var(--blue);
    white-space: nowrap;
  }
  .question-bank:not(.expanded) .bank-controls {
    display: none;
  }
  .question-bank.expanded .bank-controls {
    padding-top: 20px;
  }
}