:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #60707f;
  --line: #d9e1e6;
  --surface: #ffffff;
  --soft: #f4f7f8;
  --purple: #6d3a91;
  --rose: #b54967;
  --teal: #177f87;
  --orange: #dc6f24;
  --green: #587b3f;
  --shadow: 0 18px 50px rgba(25, 38, 52, 0.12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #f8fbfc 0%, #edf3f4 100%);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px clamp(18px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
  background: rgba(248, 251, 252, 0.94);
  backdrop-filter: blur(14px);
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  max-width: 860px;
  font-size: clamp(1.45rem, 2.8vw, 2.45rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  font-size: 1.05rem;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  font-size: 1rem;
  line-height: 1.25;
}

.eyebrow {
  margin-bottom: 6px;
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tabs {
  display: inline-grid;
  grid-template-columns: repeat(6, minmax(86px, 1fr));
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.tab {
  min-height: 38px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.tab.is-active {
  background: var(--ink);
  color: #fff;
}

main {
  padding: 28px clamp(18px, 4vw, 48px) 42px;
}

.view {
  display: none;
}

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

.overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 24px;
  align-items: start;
}

.visual-panel,
.summary-panel,
.finder,
.detail-panel,
.workflow,
.reference-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.visual-panel {
  overflow: hidden;
}

.panel-header,
.evidence-toolbar,
.study-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.visual-panel img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 800;
  cursor: pointer;
}

.text-button {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

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

.summary-panel {
  display: grid;
  gap: 20px;
  padding: 20px;
}

.summary-panel section {
  display: grid;
  gap: 8px;
}

.summary-panel p,
.detail-panel p,
.reference-card p,
.workflow li {
  color: var(--muted);
  line-height: 1.55;
}

.stat-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.stat-row div {
  min-height: 96px;
  padding: 14px;
  border-radius: 8px;
  background: var(--soft);
}

.stat-row strong {
  display: block;
  color: var(--purple);
  font-size: 2rem;
  line-height: 1;
}

.stat-row span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.88rem;
}

.finding-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 340px;
  gap: 22px;
  align-items: start;
}

.finder,
.detail-panel,
.workflow {
  padding: 18px;
}

.condition-list {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.condition-button {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 48px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.condition-button::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent, var(--purple));
}

.condition-button.is-active {
  border-color: color-mix(in srgb, var(--accent, var(--purple)) 60%, #fff);
  background: color-mix(in srgb, var(--accent, var(--purple)) 9%, #fff);
}

.detail-panel {
  display: grid;
  gap: 18px;
  min-height: 430px;
}

.detail-hero {
  display: grid;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

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

.note {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.note strong {
  display: block;
  margin-bottom: 6px;
}

.workflow ol {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 16px 0 0;
  list-style: none;
  counter-reset: steps;
}

.workflow li {
  position: relative;
  min-height: 64px;
  padding: 12px 12px 12px 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.workflow li::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute;
  left: 12px;
  top: 14px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-weight: 800;
}

.evidence-toolbar {
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.study-toolbar {
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.infograph-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  gap: 18px;
  align-items: start;
}

.source-infograph {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.source-infograph img {
  display: block;
  width: 100%;
  height: auto;
}

.micro-infographs {
  display: grid;
  gap: 14px;
}

.mini-graphic {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 14px;
  min-height: 126px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.mini-orbit {
  position: relative;
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 15%, #fff);
  color: var(--accent);
  font-size: 1.45rem;
  font-weight: 900;
}

.mini-orbit::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  border-right-color: transparent;
}

.mini-graphic div:last-child {
  display: grid;
  gap: 8px;
}

.mini-graphic ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.mini-graphic li {
  padding: 5px 8px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.card-actions,
.exam-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.flashcard-stage {
  display: grid;
  gap: 14px;
  max-width: 860px;
  margin: 0 auto;
}

.flashcard {
  display: grid;
  align-content: center;
  min-height: 360px;
  padding: clamp(22px, 5vw, 52px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: pointer;
}

.flashcard .face {
  display: grid;
  gap: 16px;
}

.flashcard .label {
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.flashcard .prompt {
  font-size: clamp(1.3rem, 3vw, 2rem);
  line-height: 1.18;
  font-weight: 850;
}

.flashcard .answer {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #dfe8eb;
}

.progress-track div {
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: var(--teal);
  transition: width 160ms ease;
}

.score-pill {
  display: inline-grid;
  place-items: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-weight: 900;
}

.exam-form {
  display: grid;
  gap: 14px;
}

.question-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.question-card fieldset {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0;
  border: 0;
}

.question-card legend {
  padding: 0;
  font-weight: 850;
  line-height: 1.35;
}

.choice {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 10px;
  align-items: start;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
  color: var(--muted);
  cursor: pointer;
}

.choice input {
  margin-top: 3px;
}

.question-card.correct {
  border-color: color-mix(in srgb, var(--green) 55%, #fff);
}

.question-card.incorrect {
  border-color: color-mix(in srgb, var(--rose) 55%, #fff);
}

.rationale {
  display: none;
  padding: 12px;
  border-radius: 8px;
  background: #eef6f4;
  color: var(--muted);
  line-height: 1.5;
}

.question-card.is-scored .rationale {
  display: block;
}

.exam-actions {
  margin-top: 18px;
}

.search {
  display: grid;
  gap: 6px;
  min-width: min(360px, 100%);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.search input {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--ink);
  text-transform: none;
  letter-spacing: 0;
  font-weight: 500;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.reference-card {
  display: grid;
  gap: 10px;
  padding: 16px;
  box-shadow: none;
}

.reference-card[data-hidden="true"] {
  display: none;
}

.reference-card .category {
  color: var(--purple);
  font-size: 0.8rem;
  font-weight: 800;
}

.reference-card cite {
  color: var(--ink);
  font-style: normal;
  font-weight: 800;
  line-height: 1.35;
}

.image-dialog {
  width: min(1180px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

.image-dialog::backdrop {
  background: rgba(14, 21, 30, 0.72);
}

.image-dialog img {
  display: block;
  width: 100%;
  height: auto;
}

.image-dialog .close {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(255, 255, 255, 0.95);
}

@media (max-width: 1100px) {
  .overview-grid,
  .finding-layout,
  .infograph-layout {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 760px) {
  .topbar,
  .panel-header,
  .evidence-toolbar,
  .study-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .tabs {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tab {
    min-width: 0;
  }

  .note-grid,
  .reference-grid {
    grid-template-columns: 1fr;
  }

  .mini-graphic {
    grid-template-columns: 1fr;
  }
}