:root {
  color-scheme: light;
  --bg: #f7f8f4;
  --surface: #ffffff;
  --surface-soft: #eef5f1;
  --ink: #202522;
  --muted: #65716a;
  --line: #d9e1db;
  --teal: #1f7a6d;
  --teal-dark: #14564c;
  --coral: #c95f4a;
  --gold: #b8841f;
  --green-soft: #dceee7;
  --red-soft: #fae5df;
  --radius: 8px;
  --shadow: 0 18px 40px rgba(35, 49, 43, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100%;
  margin: 0;
  background:
    linear-gradient(180deg, rgba(31, 122, 109, 0.08), rgba(247, 248, 244, 0) 280px),
    var(--bg);
  color: var(--ink);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0;
}

button,
input,
select {
  font: inherit;
  letter-spacing: 0;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0 14px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.35rem;
}

h3 {
  font-size: 1.18rem;
}

.source-line {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.progress-badge {
  min-width: 86px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  text-align: center;
}

.progress-badge strong {
  display: block;
  color: var(--teal-dark);
  font-size: 1.3rem;
  line-height: 1.1;
}

.progress-badge span {
  color: var(--muted);
  font-size: 0.78rem;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 8px 0 18px;
}

.metric-strip div {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.78);
}

.metric-strip strong {
  display: block;
  font-size: 1.25rem;
  line-height: 1.1;
}

.metric-strip span {
  color: var(--muted);
  font-size: 0.82rem;
}

.tabs {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.tab {
  min-height: 42px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 800;
}

.tab.is-active {
  background: var(--teal);
  color: white;
}

main {
  padding-top: 18px;
}

.view {
  display: none;
}

.view.is-active {
  display: block;
}

.panel-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.controls-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 180px) auto;
  gap: 10px;
  align-items: end;
  margin-bottom: 14px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 700;
}

select,
input {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  padding: 0 12px;
  outline: 0;
}

select:focus,
input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(31, 122, 109, 0.15);
}

.primary-button,
.ghost-button {
  min-height: 44px;
  border-radius: 6px;
  padding: 0 16px;
  border: 1px solid transparent;
  font-weight: 850;
}

.primary-button {
  background: var(--teal);
  color: #fff;
}

.primary-button:hover {
  background: var(--teal-dark);
}

.ghost-button {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.ghost-button:hover {
  border-color: var(--teal);
  color: var(--teal-dark);
}

.quiz-card,
.flashcard,
.note-card,
.disease-card,
.point-card,
.mistake-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.quiz-card {
  padding: 22px;
}

.quiz-status,
.card-counter {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.type-pill {
  display: inline-flex;
  max-width: 100%;
  margin: 14px 0 8px;
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--teal-dark);
  font-size: 0.8rem;
  font-weight: 800;
}

.option-list {
  display: grid;
  gap: 10px;
  margin: 20px 0;
}

.option-button {
  width: 100%;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  padding: 12px 14px;
  text-align: left;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.option-button:hover:not(:disabled) {
  border-color: var(--teal);
  background: var(--surface-soft);
}

.option-button.is-correct {
  border-color: var(--teal);
  background: var(--green-soft);
}

.option-button.is-wrong {
  border-color: var(--coral);
  background: var(--red-soft);
}

.feedback {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--teal);
  border-radius: 6px;
  background: var(--surface-soft);
  color: var(--ink);
  overflow-wrap: anywhere;
}

.feedback.is-wrong {
  border-left-color: var(--coral);
  background: var(--red-soft);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

.flashcard {
  min-height: 300px;
  display: grid;
  align-content: center;
  padding: 28px;
  user-select: none;
}

.flashcard h3 {
  font-size: 1.55rem;
}

.flashcard p:last-child {
  margin: 16px 0 0;
  color: var(--ink);
  font-size: 1.05rem;
  white-space: pre-line;
}

.compact-label {
  min-width: 180px;
}

.search-box {
  width: min(360px, 100%);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 14px;
}

.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  padding: 8px 12px;
  font-size: 0.86rem;
  font-weight: 800;
}

.chip.is-active {
  border-color: var(--teal);
  background: var(--teal);
  color: #fff;
}

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

.point-card {
  padding: 16px;
}

.point-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.point-head h3 {
  font-size: 1.12rem;
}

.point-head span {
  color: var(--muted);
  font-size: 0.82rem;
  text-align: right;
}

.point-meta {
  margin: 0 0 10px;
  color: var(--gold);
  font-weight: 800;
  font-size: 0.86rem;
}

.field-list {
  display: grid;
  gap: 8px;
  margin: 0;
}

.field-list div {
  display: grid;
  gap: 3px;
}

.field-list dt {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 850;
}

.field-list dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.notes-grid,
.disease-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.disease-grid {
  margin-top: 12px;
}

.note-card,
.disease-card,
.mistake-card {
  padding: 16px;
}

.note-card ul,
.disease-card ul {
  margin: 10px 0 0;
  padding-left: 1.15rem;
}

.note-card li,
.disease-card li {
  margin: 6px 0;
}

.disease-card p {
  margin: 8px 0 0;
}

.mistake-card {
  display: grid;
  gap: 8px;
}

.mistake-card p {
  margin: 0;
}

.mistake-card strong {
  color: var(--coral);
}

.empty-state {
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  color: var(--muted);
  padding: 24px;
  text-align: center;
}

.wide-button {
  width: 100%;
  margin-top: 14px;
}

.footer-note {
  padding: 24px 0 6px;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
}

@media (max-width: 760px) {
  .app-shell {
    padding: 14px 14px 24px;
  }

  .topbar {
    align-items: stretch;
  }

  h1 {
    font-size: 1.55rem;
  }

  .progress-badge {
    min-width: 76px;
    padding: 10px;
  }

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

  .tabs {
    position: sticky;
    top: 0;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 4px;
    padding: 6px;
    border-radius: var(--radius);
    box-shadow: 0 12px 28px rgba(35, 49, 43, 0.12);
  }

  .tab {
    min-height: 46px;
    padding: 0 4px;
    font-size: 0.82rem;
  }

  .panel-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }

  .quiz-card,
  .flashcard,
  .note-card,
  .disease-card,
  .point-card,
  .mistake-card {
    padding: 16px;
  }

  .flashcard {
    min-height: 260px;
  }

  .flashcard h3 {
    font-size: 1.25rem;
  }

  .compact-label,
  .search-box {
    width: 100%;
    min-width: 0;
  }

  .notes-grid,
  .disease-grid {
    grid-template-columns: 1fr;
  }

  .action-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .action-row .primary-button,
  .action-row .ghost-button {
    width: 100%;
  }

  .point-head {
    display: grid;
  }

  .point-head span {
    text-align: left;
  }
}

@media (max-width: 390px) {
  body {
    font-size: 15px;
  }

  .topbar {
    gap: 10px;
  }

  .metric-strip div {
    padding: 10px;
  }

  .tab {
    font-size: 0.76rem;
  }
}