:root {
  color-scheme: light;
  --bg: #eef4f1;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --surface-soft: rgba(255, 255, 255, 0.62);
  --border: rgba(20, 32, 48, 0.08);
  --border-strong: rgba(20, 32, 48, 0.14);
  --text-primary: #132033;
  --text-secondary: #526171;
  --text-soft: #728090;
  --shadow-xl: 0 30px 80px rgba(16, 29, 45, 0.14);
  --shadow-lg: 0 18px 44px rgba(16, 29, 45, 0.1);
  --shadow-md: 0 12px 28px rgba(16, 29, 45, 0.08);
  --radius-xl: 30px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
  --sidebar-width-expanded: 320px;
  --sidebar-width-collapsed: 108px;
  --sidebar-width: var(--sidebar-width-expanded);
  --topbar-height: 96px;
  --accent: #bf4652;
  --accent-strong: #962d3a;
  --accent-soft: rgba(191, 70, 82, 0.14);
  --success: #17745d;
  --success-soft: rgba(23, 116, 93, 0.13);
  --warning: #b47d18;
  --warning-soft: rgba(180, 125, 24, 0.14);
  --danger: #c93f49;
  --danger-soft: rgba(201, 63, 73, 0.14);
  --purple: #8f5663;
  --purple-soft: rgba(143, 86, 99, 0.14);
  --pattern:
    radial-gradient(circle at 10% 12%, rgba(191, 70, 82, 0.16), transparent 22%),
    radial-gradient(circle at 82% 18%, rgba(42, 110, 220, 0.11), transparent 22%),
    radial-gradient(circle at 78% 82%, rgba(180, 125, 24, 0.1), transparent 20%),
    radial-gradient(circle at 20% 76%, rgba(23, 116, 93, 0.09), transparent 18%);
}

body[data-theme="blue"] {
  --accent: #2a6edc;
  --accent-strong: #154fb6;
  --accent-soft: rgba(42, 110, 220, 0.14);
}

body[data-theme="teal"] {
  --accent: #0f888f;
  --accent-strong: #0a6970;
  --accent-soft: rgba(15, 136, 143, 0.14);
}

body[data-theme="emerald"] {
  --accent: #17745d;
  --accent-strong: #0d5a47;
  --accent-soft: rgba(23, 116, 93, 0.14);
}

body[data-theme="amber"] {
  --accent: #b47d18;
  --accent-strong: #8e6210;
  --accent-soft: rgba(180, 125, 24, 0.16);
}

body[data-theme="red"] {
  --accent: #c93f49;
  --accent-strong: #9e2632;
  --accent-soft: rgba(201, 63, 73, 0.16);
}

body[data-theme="purple"] {
  --accent: #8f5663;
  --accent-strong: #6f404d;
  --accent-soft: rgba(143, 86, 99, 0.14);
}

body[data-theme="slate"] {
  --accent: #5c6f84;
  --accent-strong: #46586b;
  --accent-soft: rgba(92, 111, 132, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "SF Pro Display", "SF Pro Text", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--text-primary);
  background:
    var(--pattern),
    linear-gradient(180deg, #fbfdfc 0%, var(--bg) 100%);
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}

img {
  max-width: 100%;
}

code {
  padding: 0.16rem 0.42rem;
  border-radius: 8px;
  background: rgba(17, 33, 54, 0.06);
  font-family: "SF Mono", "Menlo", monospace;
  font-size: 0.92em;
}

.mobile-scrim {
  position: fixed;
  inset: 0;
  background: rgba(7, 18, 34, 0.28);
  backdrop-filter: blur(6px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 240ms ease, visibility 240ms ease;
  z-index: 20;
}

body.menu-open .mobile-scrim {
  opacity: 1;
  visibility: visible;
}

.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns 260ms ease;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 18px;
  overflow: hidden;
}

.sidebar-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: calc(100vh - 36px);
  padding: 18px;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(247, 250, 255, 0.78) 100%);
  border: 1px solid rgba(255, 255, 255, 0.74);
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(24px);
}

.sidebar-panel__top {
  display: grid;
  gap: 16px;
}

.sidebar-toolbar,
.brand,
.sidebar-progress__meta,
.topbar-actions,
.button-row,
.tag-row,
.quiz-toolbar,
.stats-row,
.status-row,
.flash-controls,
.update-card__head {
  display: flex;
  align-items: center;
}

.brand {
  gap: 14px;
  padding: 14px;
  border-radius: 22px;
  text-decoration: none;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.42) 100%);
  border: 1px solid rgba(255, 255, 255, 0.72);
}

.brand__orb {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 58%, #ffffff 42%) 100%);
  color: #fff;
  font-size: 0.98rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  box-shadow: 0 16px 28px color-mix(in srgb, var(--accent) 26%, transparent 74%);
}

.brand__copy {
  display: grid;
  gap: 4px;
}

.brand h1,
.section-card__title h3,
.page-card h3,
.mini-card p,
.flow-card h3,
.timeline-card p,
.tip-card h3,
.mnemonic-card p,
.comparison-table th,
.comparison-table td,
.quiz-card h4,
.flashcard-face h3,
.check-item strong,
.hero h1,
.topbar-copy h2,
.stat-card strong,
.quiz-results h4,
.update-card h3,
.mini-quiz-meta h4 {
  margin: 0;
}

.brand h1 {
  font-size: 1.16rem;
  letter-spacing: -0.03em;
}

.brand p,
.sidebar-footer p,
.sidebar-progress p,
.topbar-copy p,
.section-card__title p,
.stat-card p,
.hero p,
.page-card p,
.timeline-card p,
.flow-card p,
.mini-card p,
.tip-card p,
.mnemonic-card small,
.special-card p,
.subtle,
.flashcard-face p,
.quiz-result-card p,
.feedback-box,
.check-item small,
.mini-quiz-meta p,
.update-card p,
.update-card__impact p {
  color: var(--text-secondary);
}

.brand p,
.section-card__title p,
.stat-card p,
.page-card p,
.timeline-card p,
.flow-card p,
.tip-card p,
.mnemonic-card small,
.special-card p,
.subtle,
.quiz-result-card p,
.update-card p,
.update-card__impact p {
  line-height: 1.6;
}

.sidebar-toolbar {
  justify-content: space-between;
  gap: 10px;
}

.sidebar-toolbar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-kicker,
.topbar-kicker,
.section-kicker,
.card-kicker,
.metric-label {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.74rem;
  font-weight: 800;
}

.sidebar-kicker,
.topbar-kicker,
.section-kicker,
.card-kicker {
  color: var(--accent);
}

.metric-label {
  color: var(--text-soft);
}

.sidebar-nav {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 6px;
  scrollbar-gutter: stable;
}

.sidebar-nav::-webkit-scrollbar {
  width: 8px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(81, 98, 114, 0.22);
  border-radius: 999px;
}

.nav-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-section-title {
  padding: 6px 8px 4px;
  color: var(--text-soft);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-link {
  position: relative;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: 18px;
  text-decoration: none;
  color: inherit;
  border: 1px solid transparent;
  transition: transform 220ms ease, background 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
}

.nav-link:hover {
  transform: translateX(2px);
  background: rgba(255, 255, 255, 0.64);
  border-color: rgba(17, 32, 51, 0.05);
}

.nav-link.is-active {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.84) 0%, rgba(255, 255, 255, 0.64) 100%);
  border-color: color-mix(in srgb, var(--accent) 28%, rgba(17, 32, 51, 0.05));
  box-shadow: 0 16px 34px color-mix(in srgb, var(--accent) 12%, transparent 88%);
}

.nav-link__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 800;
}

.nav-link__copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.nav-link__copy strong {
  font-size: 0.96rem;
  letter-spacing: -0.01em;
}

.nav-link__copy small {
  color: var(--text-secondary);
  font-size: 0.79rem;
  line-height: 1.4;
}

.nav-link__meta {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(17, 32, 51, 0.05);
  font-size: 0.76rem;
  font-weight: 800;
  color: var(--text-secondary);
}

.sidebar-progress,
.sidebar-footer,
.topbar,
.hero,
.stat-card,
.page-card,
.section-card,
.checklist-card,
.timeline-card,
.flow-card,
.mini-card,
.special-card,
.mnemonic-card,
.tip-card,
.update-card,
.quiz-shell,
.quiz-card,
.quiz-result-card,
.flash-shell {
  background: var(--surface);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-lg);
}

.sidebar-progress,
.sidebar-footer {
  padding: 16px;
  border-radius: 22px;
}

.sidebar-progress h3,
.sidebar-footer strong,
.checklist-card h3,
.flow-card h3,
.timeline-card .metric-label,
.special-card h4,
.mnemonic-card .mnemonic-phrase,
.tip-card h3,
.quiz-result-card h4,
.update-card h3,
.mini-quiz-meta h4 {
  color: var(--text-primary);
}

.sidebar-progress h3,
.checklist-card h3,
.flow-card h3,
.special-card h4,
.tip-card h3,
.quiz-result-card h4,
.update-card h3 {
  margin: 0 0 10px;
}

.sidebar-progress__meta,
.topbar-actions,
.stats-row,
.status-row {
  justify-content: space-between;
}

.sidebar-progress__meta {
  margin-top: 10px;
  gap: 12px;
  font-size: 0.88rem;
}

.sidebar-footer {
  margin-top: auto;
}

.content-shell {
  min-width: 0;
  padding: 20px 20px 32px 0;
}

.topbar {
  position: sticky;
  top: 18px;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: var(--topbar-height);
  padding: 18px 22px;
  border-radius: 24px;
}

.topbar-copy {
  display: grid;
  gap: 8px;
}

.topbar-copy__lead {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.topbar-copy h2 {
  font-size: clamp(1.4rem, 2vw, 1.95rem);
  letter-spacing: -0.03em;
}

.topbar-copy p {
  margin: 0;
}

.topbar-actions {
  gap: 10px;
  flex-wrap: wrap;
}

.pill,
.category-pill,
.count-pill,
.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 800;
}

.pill,
.count-pill,
.category-pill {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(17, 32, 51, 0.05);
  color: var(--text-secondary);
}

.page-shell {
  padding: 20px 0 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.9fr);
  gap: 22px;
  padding: 28px;
  border-radius: 28px;
}

.hero__copy {
  display: grid;
  align-content: start;
  gap: 16px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  line-height: 0.96;
  letter-spacing: -0.05em;
}

.hero p {
  margin: 0;
  font-size: 1.03rem;
}

.hero__aside,
.hero-stats {
  display: grid;
  gap: 14px;
}

.tag-row,
.button-row,
.flash-controls,
.status-row,
.topbar-actions {
  gap: 10px;
  flex-wrap: wrap;
}

.tag {
  border: 1px solid transparent;
}

.tag--accent {
  background: var(--accent-soft);
  color: var(--accent);
}

.tag--success {
  background: var(--success-soft);
  color: var(--success);
}

.tag--warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.tag--danger {
  background: var(--danger-soft);
  color: var(--danger);
}

.tag--purple {
  background: var(--purple-soft);
  color: var(--purple);
}

.btn,
.icon-btn,
.answer-btn,
.status-toggle,
.check-item {
  transition: transform 220ms ease, box-shadow 220ms ease, background 220ms ease, border-color 220ms ease, color 220ms ease;
}

.btn,
.icon-btn {
  border: 0;
  cursor: pointer;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 16px;
  font-weight: 800;
  text-decoration: none;
}

.btn:hover,
.icon-btn:hover,
.answer-btn:hover,
.status-toggle:hover,
.check-item:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 65%, #ffffff 35%) 100%);
  color: #fff;
  box-shadow: 0 16px 30px color-mix(in srgb, var(--accent) 28%, transparent 72%);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.82);
  color: var(--text-primary);
  border: 1px solid rgba(17, 32, 51, 0.06);
}

.btn--soft {
  background: var(--accent-soft);
  color: var(--accent);
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--text-primary);
  border: 1px solid rgba(17, 32, 51, 0.06);
}

.mobile-only {
  display: none;
}

.desktop-only {
  display: inline-flex;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.76fr);
  gap: 22px;
  margin-top: 22px;
}

.main-column,
.rail-column,
.dashboard-group,
.hero-stats,
.card-grid,
.special-grid,
.tip-grid,
.mini-grid,
.quiz-summary,
.table-card-list,
.updates-grid {
  display: grid;
  gap: 18px;
}

.dashboard-group {
  margin-top: 22px;
}

.dashboard-group__title,
.section-headline {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 14px;
}

.section-headline h2 {
  margin: 0;
  font-size: clamp(1.45rem, 2vw, 2rem);
  letter-spacing: -0.03em;
}

.section-headline p {
  margin: 0;
  color: var(--text-secondary);
}

.card-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.updates-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.page-card,
.timeline-card,
.flow-card,
.stat-card,
.mini-card,
.special-card,
.mnemonic-card,
.tip-card,
.update-card {
  border-radius: 24px;
  padding: 18px;
}

.page-card {
  display: grid;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}

.page-card__header,
.section-card__header,
.quiz-card__header,
.mini-quiz-item__head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
}

.page-card__icon,
.section-card__icon,
.mini-card__icon,
.tip-card__icon,
.question-index {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
}

.page-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.count-pill {
  min-height: 32px;
}

.section-card {
  padding: 22px;
  border-radius: 28px;
}

.section-card--mini-quiz {
  border-color: color-mix(in srgb, var(--accent) 18%, rgba(255, 255, 255, 0.72));
}

.section-card__header {
  margin-bottom: 18px;
}

.section-card__icon {
  width: 50px;
  height: 50px;
}

.section-card__title {
  display: grid;
  gap: 6px;
}

.section-card__title h3 {
  font-size: 1.26rem;
  letter-spacing: -0.03em;
}

.section-card__body p,
.special-card p,
.tip-card p,
.mnemonic-card p,
.flashcard-face p,
.check-item small,
.quiz-result-card p,
.feedback-box,
.update-card__impact p,
.mini-quiz-meta p {
  margin: 0;
  line-height: 1.72;
}

.section-card__body p + p {
  margin-top: 10px;
}

.bullet-list,
.ordered-list,
.checklist {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.bullet-list,
.ordered-list {
  padding-left: 18px;
}

.bullet-list li,
.ordered-list li {
  color: var(--text-secondary);
  line-height: 1.7;
}

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.7);
}

.comparison-table thead th {
  padding: 14px 16px;
  background: rgba(17, 32, 51, 0.04);
  text-align: left;
  font-size: 0.88rem;
  color: var(--text-primary);
}

.comparison-table td {
  padding: 14px 16px;
  border-top: 1px solid rgba(17, 32, 51, 0.06);
  vertical-align: top;
  color: var(--text-secondary);
  line-height: 1.55;
  font-size: 0.92rem;
}

.table-wrap {
  overflow-x: auto;
}

.treatment-grid {
  display: grid;
  gap: 16px;
}

.treatment-card,
.warning-box,
.note-box {
  padding: 16px;
  border-radius: 20px;
}

.treatment-card {
  background: rgba(255, 255, 255, 0.76);
}

.warning-box {
  background: var(--warning-soft);
}

.note-box {
  background: rgba(17, 32, 51, 0.04);
}

.treatment-card h4,
.warning-box h4,
.note-box h4 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.med-list {
  display: grid;
  gap: 12px;
}

.med-row {
  display: grid;
  gap: 8px;
}

.med-row__meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.med-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(17, 32, 51, 0.05);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 800;
}

.mini-grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.mini-card {
  display: grid;
  gap: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.8) 0%, rgba(255, 255, 255, 0.62) 100%);
}

.mini-card__icon {
  width: 42px;
  height: 42px;
}

.special-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.mnemonic-card {
  display: grid;
  gap: 8px;
  background: linear-gradient(180deg, var(--purple-soft) 0%, rgba(255, 255, 255, 0.82) 100%);
}

.mnemonic-card small {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 800;
}

.mnemonic-phrase {
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--purple);
}

.tip-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.tip-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
}

.tip-card--trap .tip-card__icon {
  background: var(--warning-soft);
  color: var(--warning);
}

.checklist-card {
  display: grid;
  gap: 16px;
  padding: 18px;
  border-radius: 24px;
}

.check-item {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: center;
  width: 100%;
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(17, 32, 51, 0.06);
  background: rgba(255, 255, 255, 0.74);
  cursor: pointer;
  text-align: left;
}

.check-item.is-done {
  border-color: color-mix(in srgb, var(--accent) 30%, rgba(17, 32, 51, 0.05));
  background: color-mix(in srgb, var(--accent-soft) 65%, #ffffff 35%);
}

.check-box {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: rgba(17, 32, 51, 0.06);
  color: var(--accent);
  font-weight: 900;
}

.progress-track {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(17, 32, 51, 0.08);
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent) 0%, color-mix(in srgb, var(--accent) 55%, #ffffff 45%) 100%);
}

.question-index {
  width: 52px;
  height: 52px;
  font-size: 1.1rem;
}

.quiz-shell,
.flash-shell {
  padding: 22px;
  border-radius: 28px;
}

.quiz-toolbar,
.flash-toolbar {
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.quiz-progress,
.flash-progress {
  flex: 1;
  min-width: 220px;
  display: grid;
  gap: 10px;
}

.quiz-card,
.quiz-result-card {
  padding: 20px;
  border-radius: 24px;
}

.quiz-card {
  display: grid;
  gap: 18px;
}

.quiz-question-text {
  margin: 10px 0 8px;
  color: var(--text-primary);
  font-weight: 800;
  line-height: 1.5;
}

.answer-list {
  display: grid;
  gap: 12px;
}

.answer-btn,
.status-toggle {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(17, 32, 51, 0.08);
  background: rgba(255, 255, 255, 0.78);
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  font-weight: 700;
}

.answer-btn--mini {
  padding: 13px 15px;
}

.answer-btn.is-correct {
  background: var(--success-soft);
  border-color: rgba(21, 149, 111, 0.24);
  color: var(--success);
}

.answer-btn.is-wrong {
  background: var(--danger-soft);
  border-color: rgba(212, 77, 88, 0.22);
  color: var(--danger);
}

.feedback-box {
  padding: 16px;
  border-radius: 18px;
}

.feedback-box--good {
  background: var(--success-soft);
}

.feedback-box--bad {
  background: var(--danger-soft);
}

.quiz-results {
  display: none;
  gap: 16px;
  margin-top: 18px;
}

.quiz-results.is-visible {
  display: grid;
}

.score {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.05em;
}

.hidden {
  display: none !important;
}

.mini-quiz-shell,
.mini-quiz-list {
  display: grid;
  gap: 18px;
}

.mini-quiz-item {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(17, 32, 51, 0.06);
}

.mini-quiz-meta {
  display: grid;
  gap: 6px;
}

.updates-grid {
  align-items: start;
}

.update-card {
  display: grid;
  gap: 14px;
}

.update-card__head {
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.source-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(17, 32, 51, 0.06);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--text-primary);
}

.update-card__impact {
  display: grid;
  gap: 8px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(17, 32, 51, 0.04);
}

.update-card__impact strong {
  color: var(--text-primary);
}

.flash-body {
  display: grid;
  gap: 18px;
}

.flashcard-scene {
  perspective: 1600px;
}

.flashcard-unit {
  position: relative;
  min-height: 360px;
  transform-style: preserve-3d;
  transition: transform 480ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.flashcard-unit.is-flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: start;
  gap: 16px;
  padding: 28px;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(244, 248, 255, 0.8) 100%);
  border: 1px solid rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow-lg);
  backface-visibility: hidden;
}

.flashcard-face--front {
  justify-content: center;
}

.flashcard-face--back {
  transform: rotateY(180deg);
}

.flashcard-face h3 {
  font-size: clamp(1.45rem, 2vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.status-toggle {
  text-align: center;
}

.status-toggle.is-active {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 28%, rgba(17, 32, 51, 0.06));
  color: var(--accent);
}

.timeline-card,
.flow-card,
.special-card {
  display: grid;
  gap: 10px;
}

.flow-card ol {
  margin: 0;
  padding-left: 20px;
  color: var(--text-secondary);
  display: grid;
  gap: 8px;
  line-height: 1.65;
}

.animate-ready {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 460ms ease, transform 460ms ease;
}

.animate-ready.animate-in {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 981px) {
  body.sidebar-collapsed {
    --sidebar-width: var(--sidebar-width-collapsed);
  }

  /* Mostra apenas um toggle desktop por estado. */
  body:not(.sidebar-collapsed) #topbarSidebarToggle {
    display: none;
  }

  body.sidebar-collapsed #sidebarToggle {
    display: none;
  }

  body.sidebar-collapsed .sidebar-panel {
    padding: 16px 12px;
  }

  body.sidebar-collapsed .brand {
    justify-content: center;
    padding: 12px;
  }

  body.sidebar-collapsed .brand__copy,
  body.sidebar-collapsed .sidebar-kicker,
  body.sidebar-collapsed .nav-section-title,
  body.sidebar-collapsed .nav-link__copy,
  body.sidebar-collapsed .nav-link__meta,
  body.sidebar-collapsed .sidebar-progress,
  body.sidebar-collapsed .sidebar-footer {
    display: none;
  }

  body.sidebar-collapsed .sidebar-toolbar {
    justify-content: center;
  }

  body.sidebar-collapsed .sidebar-panel__top {
    gap: 12px;
  }

  body.sidebar-collapsed .sidebar-nav {
    padding-inline: 0;
    gap: 12px;
    overflow-x: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  /* No compacto, cada item vira um trilho de icone unico e centralizado. */
  body.sidebar-collapsed .nav-link {
    grid-template-columns: 1fr;
    place-items: center;
    justify-items: center;
    min-height: 64px;
    padding: 10px 0;
  }

  body.sidebar-collapsed .sidebar-nav::-webkit-scrollbar {
    width: 0;
    height: 0;
  }

  /* Reseta qualquer deslocamento e mantem a sigla no fluxo normal. */
  body.sidebar-collapsed .nav-link__icon {
    position: static;
    inset: auto;
    left: auto;
    top: auto;
    transform: none;
    margin: 0;
    width: 44px;
    height: 44px;
  }

  body.sidebar-collapsed .nav-link:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    top: 50%;
    left: calc(100% + 12px);
    transform: translateY(-50%);
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(17, 32, 51, 0.92);
    color: #fff;
    white-space: nowrap;
    font-size: 0.78rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
  }
}

@media (max-width: 1200px) {
  .hero,
  .page-grid {
    grid-template-columns: 1fr;
  }

  .content-shell {
    padding-right: 18px;
  }
}

@media (max-width: 980px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 30;
    width: min(92vw, 360px);
    transform: translateX(-108%);
    transition: transform 280ms ease;
  }

  body.menu-open {
    overflow: hidden;
  }

  body.menu-open .sidebar {
    transform: translateX(0);
  }

  .content-shell {
    padding: 16px;
  }

  .topbar {
    top: 0;
    border-radius: 22px;
  }

  .mobile-only {
    display: inline-flex;
  }

  .desktop-only {
    display: none;
  }
}

@media (max-width: 720px) {
  .hero,
  .section-card,
  .quiz-shell,
  .flash-shell,
  .topbar {
    padding: 18px;
  }

  .hero h1 {
    font-size: clamp(1.9rem, 8vw, 2.8rem);
  }

  .card-grid,
  .special-grid,
  .tip-grid,
  .mini-grid,
  .updates-grid {
    grid-template-columns: 1fr;
  }

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

  .page-card__footer,
  .stats-row,
  .sidebar-progress__meta {
    flex-wrap: wrap;
  }
}