:root {
  color-scheme: dark;
  --font-sans: "Aptos", "Segoe UI Variable", "Segoe UI", "Helvetica Neue", sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --page-bg: #07111f;
  --page-bg-alt: #0d1726;
  --surface: rgba(17, 26, 43, 0.88);
  --surface-strong: rgba(24, 36, 56, 0.96);
  --surface-soft: rgba(10, 18, 32, 0.76);
  --border: rgba(148, 163, 184, 0.16);
  --border-strong: rgba(148, 163, 184, 0.28);
  --text: #e5eefc;
  --text-dim: #94a9c8;
  --text-soft: #b9c8de;
  --accent: #41c8c6;
  --accent-strong: #12b8b1;
  --accent-contrast: #052227;
  --accent-glow: rgba(65, 200, 198, 0.18);
  --accent-soft: rgba(65, 200, 198, 0.1);
  --correct: #31c772;
  --correct-bg: rgba(49, 199, 114, 0.14);
  --wrong: #f05d67;
  --wrong-bg: rgba(240, 93, 103, 0.14);
  --gold: #f2b84b;
  --gold-soft: rgba(242, 184, 75, 0.18);
  --shadow-lg: 0 30px 70px rgba(2, 8, 23, 0.38);
  --shadow-md: 0 18px 36px rgba(2, 8, 23, 0.2);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 12px;
  --max-width: 1180px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --page-bg: #eef4fb;
  --page-bg-alt: #dfe8f4;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: rgba(255, 255, 255, 0.96);
  --surface-soft: rgba(248, 251, 255, 0.92);
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.18);
  --text: #172233;
  --text-dim: #60748d;
  --text-soft: #44556f;
  --accent-contrast: #ffffff;
  --shadow-lg: 0 28px 60px rgba(15, 23, 42, 0.12);
  --shadow-md: 0 14px 28px rgba(15, 23, 42, 0.08);
}

:root[data-accent="teal"] {
  --accent: #41c8c6;
  --accent-strong: #12b8b1;
  --accent-glow: rgba(65, 200, 198, 0.18);
  --accent-soft: rgba(65, 200, 198, 0.1);
}

:root[data-accent="blue"] {
  --accent: #4b82ff;
  --accent-strong: #2f67ec;
  --accent-glow: rgba(75, 130, 255, 0.18);
  --accent-soft: rgba(75, 130, 255, 0.1);
}

:root[data-accent="emerald"] {
  --accent: #22c98b;
  --accent-strong: #0fa76f;
  --accent-glow: rgba(34, 201, 139, 0.18);
  --accent-soft: rgba(34, 201, 139, 0.1);
}

:root[data-accent="rose"] {
  --accent: #ef648d;
  --accent-strong: #df3f71;
  --accent-glow: rgba(239, 100, 141, 0.18);
  --accent-soft: rgba(239, 100, 141, 0.1);
}

:root[data-accent="amber"] {
  --accent: #e9a931;
  --accent-strong: #cf8e14;
  --accent-glow: rgba(233, 169, 49, 0.18);
  --accent-soft: rgba(233, 169, 49, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(circle at top left, var(--accent-soft), transparent 28%),
    radial-gradient(circle at top right, rgba(242, 184, 75, 0.12), transparent 24%),
    linear-gradient(180deg, var(--page-bg) 0%, var(--page-bg-alt) 100%);
}

button,
select,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: var(--accent-strong);
}

.hidden {
  display: none !important;
}

.page-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-strong) 92%, transparent);
  backdrop-filter: blur(18px);
}

.brand-block,
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 2.8rem;
  height: 2.8rem;
}

.brand-logo {
  width: 2.8rem;
  height: 2.8rem;
  object-fit: contain;
  border-radius: 0;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.eyebrow,
.section-eyebrow,
.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--text-dim);
}

.logo {
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.logo span {
  color: var(--accent);
}

.nav {
  display: inline-flex;
  justify-self: center;
  gap: 0.45rem;
  padding: 0.3rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-soft);
}

.nav button,
.segmented-btn,
.chip,
.icon-btn,
.nav-grid button {
  transition: 180ms ease;
}

.nav button {
  border: none;
  background: transparent;
  color: var(--text-dim);
  padding: 0.7rem 1.05rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
}

.nav button:hover,
.nav button.active {
  color: var(--text);
  background: var(--accent-soft);
}

.status-pill {
  padding: 0.72rem 0.95rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--text-dim);
  font-size: 0.84rem;
  white-space: nowrap;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.78rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--text);
}

.icon-btn:hover,
.icon-btn:focus-visible {
  border-color: var(--border-strong);
  box-shadow: 0 0 0 4px var(--accent-soft);
  outline: none;
}

.icon-btn-symbol {
  font-size: 1rem;
}

.icon-btn-quiet {
  padding: 0.6rem 0.8rem;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 2rem 0 3.5rem;
}

.view-stack > * + * {
  margin-top: 1.1rem;
}

.card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  background: var(--surface);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(16px);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 22%);
  pointer-events: none;
}

.card-tight {
  padding: 1.2rem;
}

.hero {
  display: grid;
  gap: 1.15rem;
  overflow: hidden;
}

.hero-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
}

.hero-head-copy {
  min-width: 0;
}

.hero-top {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.95fr);
  gap: 1.25rem;
  align-items: start;
}

.hero-top.collapsed {
  display: none;
}

.hero-copy {
  min-width: 0;
}

.hero-copy h1 {
  margin-top: 0.75rem;
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
  max-width: 14ch;
}

.hero-copy p {
  margin-top: 1rem;
  max-width: 56ch;
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.75;
}

.exam-overview-card {
  padding: 1rem 1.05rem;
  border: 1px solid color-mix(in srgb, var(--accent) 26%, var(--border));
  border-radius: var(--radius-xl);
  background: linear-gradient(
    145deg,
    color-mix(in srgb, var(--accent-soft) 38%, var(--surface-soft)),
    color-mix(in srgb, var(--surface) 90%, transparent)
  );
  box-shadow: 0 16px 34px color-mix(in srgb, var(--accent) 10%, transparent);
}

.exam-overview-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.9rem;
}

.exam-overview-head h2 {
  margin-top: 0.3rem;
  font-size: 1rem;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.exam-overview-total {
  min-width: 120px;
  padding: 0.8rem 0.95rem;
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--border));
  background: color-mix(in srgb, var(--accent-soft) 62%, var(--surface-soft));
  text-align: center;
}

.exam-overview-total strong {
  display: block;
  font-size: 1.45rem;
  letter-spacing: -0.04em;
  color: var(--text);
}

.exam-overview-total span {
  display: block;
  margin-top: 0.2rem;
  color: var(--text-dim);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.exam-overview-copy {
  margin-top: 0.85rem;
  color: var(--text-soft);
  line-height: 1.65;
  max-width: 62ch;
}

.exam-breakdown {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 0.95rem;
}

.exam-breakdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-soft) 92%, transparent);
}

.exam-breakdown-item span {
  color: var(--text-soft);
  font-weight: 600;
  line-height: 1.45;
}

.exam-breakdown-item strong {
  color: var(--accent);
  font-size: 1.05rem;
  letter-spacing: -0.03em;
}

.exam-overview-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  margin-top: 0.95rem;
}

.exam-overview-note {
  color: var(--text-dim);
  line-height: 1.5;
}

.exam-overview-note strong {
  color: var(--text);
}

.exam-overview-link {
  border-color: color-mix(in srgb, var(--accent) 44%, var(--border));
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--surface-soft));
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.metric-card,
.stat-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.05rem;
  background: var(--surface-soft);
}

.metric-label,
.stat-card .label {
  color: var(--text-dim);
  font-size: 0.82rem;
}

.metric-value,
.stat-card .val {
  margin-top: 0.45rem;
  font-size: clamp(1.45rem, 2vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.section-head.compact {
  margin-bottom: 0.9rem;
}

.section-head h2,
.card h3 {
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}

.section-head p {
  max-width: 44ch;
  color: var(--text-dim);
  line-height: 1.6;
}

.setup-grid {
  display: grid;
  gap: 1rem;
}

.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.85rem;
}

.compact-focus-grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
}

.vertical-setup-stack {
  grid-template-columns: minmax(0, 420px);
  gap: 0.72rem;
  align-items: start;
}

.setup-section h3,
.settings-section h3 {
  margin-bottom: 0.75rem;
  color: var(--text-soft);
  font-size: 0.95rem;
  font-weight: 600;
}

.filter-row,
.actions,
.control-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.chip {
  border: 1px solid var(--border);
  background: var(--surface-soft);
  color: var(--text-dim);
  padding: 0.62rem 0.92rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

.chip:hover,
.chip.active {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--accent-soft);
}

.chip .count {
  margin-left: 0.35rem;
  opacity: 0.7;
}

.control-row {
  align-items: end;
  margin-top: 1.2rem;
}

.compact-control-row {
  margin-top: 0.95rem;
  align-items: center;
}

.vertical-setup-actions {
  margin-top: 0.8rem;
  justify-content: flex-start;
  align-items: center;
}

.control-row-wrap {
  align-items: center;
}

.field {
  display: grid;
  gap: 0.4rem;
  min-width: 11rem;
}

.compact-setup-card {
  padding-top: 1.15rem;
  padding-bottom: 1.1rem;
}

.compact-setup-card .focus-grid + .compact-control-row {
  max-width: 420px;
}

.compact-setup-card .section-head {
  margin-bottom: 0.85rem;
}

.compact-setup-card .section-head p {
  max-width: 56ch;
  font-size: 0.94rem;
  line-height: 1.55;
}

.compact-setup-card .field {
  min-width: 0;
}

.compact-setup-card .field span,
.compact-setup-card .toggle span,
.compact-setup-card .inline-note {
  font-size: 0.8rem;
}

.compact-setup-card select {
  min-height: 2.55rem;
  padding: 0.62rem 0.8rem;
}

.vertical-setup-stack .toggle {
  min-height: auto;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
}

.vertical-setup-actions .inline-note {
  min-height: 2.55rem;
  display: inline-flex;
  align-items: center;
}

.field-action {
  align-content: end;
}

.toggle-field {
  align-content: end;
}

.vertical-setup-stack .toggle-field {
  align-content: start;
}

.field span,
.toggle span,
.inline-note {
  color: var(--text-dim);
  font-size: 0.85rem;
}

select,
input[type="number"] {
  min-height: 2.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.72rem 0.9rem;
  background: var(--surface-soft);
  color: var(--text);
}

select:focus,
input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 2.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.8rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
}

.btn-small {
  min-height: 2.25rem;
  padding: 0.55rem 0.85rem;
  font-size: 0.84rem;
  font-weight: 600;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--accent-contrast);
  box-shadow: 0 10px 24px var(--accent-glow);
}

.btn-secondary {
  border-color: var(--border);
  background: var(--surface-soft);
  color: var(--text);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--border-strong);
}

.btn-danger {
  border-color: color-mix(in srgb, var(--wrong) 50%, var(--border));
  background: rgba(240, 93, 103, 0.08);
  color: var(--wrong);
}

.score-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0.95rem 1.1rem;
  background: var(--surface-soft);
  box-shadow: var(--shadow-md);
}

.stat {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-soft);
}

.stat-muted {
  color: var(--text-dim);
}

.num,
.pct,
.timer {
  font-weight: 700;
  letter-spacing: -0.03em;
}

.num,
.pct {
  font-size: 1.2rem;
}

.num.green {
  color: var(--correct);
}

.num.red {
  color: var(--wrong);
}

.pct {
  color: var(--gold);
}

.timer {
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 1.35rem;
}

.sep {
  width: 1px;
  height: 1.25rem;
  background: var(--border);
}

.spacer {
  flex: 1;
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
}

.study-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.study-toolbar .toolbar-group .btn:last-child {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--border));
  background: linear-gradient(135deg, var(--accent-soft), color-mix(in srgb, var(--surface-soft) 78%, transparent));
  color: var(--text);
}

.flashcard-shell,
.review-card {
  display: grid;
  gap: 0.9rem;
}

.flashcard-meta,
.review-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
}

.flashcard-stage {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, var(--surface-soft), color-mix(in srgb, var(--surface) 82%, transparent));
  padding: 1.15rem 1.2rem;
  text-align: left;
  box-shadow: var(--shadow-md);
  white-space: normal;
}

.flashcard-face {
  display: grid;
  gap: 0.85rem;
  min-height: 0;
  align-content: start;
}

.flashcard-answer-block,
.flashcard-explanation-block {
  display: grid;
  gap: 0.8rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.flashcard-face-label,
.review-kicker {
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
}

.flashcard-copy {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: normal;
}

.flashcard-copy strong {
  color: var(--accent);
}

.flashcard-answer {
  padding: 0.95rem 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in srgb, var(--accent) 32%, var(--border));
  background: color-mix(in srgb, var(--accent-soft) 62%, transparent);
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text);
  white-space: normal;
  overflow-wrap: anywhere;
}

.flashcard-answer strong {
  color: var(--accent);
}

.flashcard-help-toolbar {
  margin-bottom: 0.2rem;
}

.helper-action-btn {
  border-color: color-mix(in srgb, var(--accent) 42%, var(--border));
  background: color-mix(in srgb, var(--accent-soft) 78%, var(--surface-soft));
  color: var(--text);
  box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 14%, transparent);
}

.helper-action-btn:hover,
.helper-action-btn:focus-visible {
  border-color: color-mix(in srgb, var(--accent) 62%, var(--border));
  background: color-mix(in srgb, var(--accent-soft) 94%, var(--surface-soft));
  outline: none;
}

.helper-action-btn-premium {
  border-color: color-mix(in srgb, var(--accent) 58%, var(--border));
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--accent-soft) 92%, var(--surface-soft)),
    color-mix(in srgb, var(--accent) 18%, var(--surface))
  );
  box-shadow:
    0 10px 26px color-mix(in srgb, var(--accent) 16%, transparent),
    inset 0 1px 0 color-mix(in srgb, white 22%, transparent);
}

.flag-action-btn {
  border-color: color-mix(in srgb, var(--accent) 32%, var(--border));
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--accent-soft) 52%, var(--surface-soft)),
    color-mix(in srgb, var(--surface) 88%, transparent)
  );
  color: var(--text);
  box-shadow: 0 8px 18px color-mix(in srgb, var(--accent) 10%, transparent);
}

.flag-action-btn:hover,
.flag-action-btn:focus-visible,
.flag-action-btn.is-open {
  border-color: color-mix(in srgb, var(--accent) 52%, var(--border));
  background: color-mix(in srgb, var(--accent-soft) 80%, var(--surface-soft));
  outline: none;
}

.flag-action-btn.has-flags {
  border-color: color-mix(in srgb, var(--accent) 62%, var(--border));
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--accent-soft) 88%, var(--surface-soft)),
    color-mix(in srgb, var(--accent) 16%, var(--surface))
  );
  box-shadow:
    0 10px 24px color-mix(in srgb, var(--accent) 14%, transparent),
    inset 0 1px 0 color-mix(in srgb, white 18%, transparent);
}

.review-card h3 {
  font-size: 1.3rem;
  letter-spacing: -0.03em;
  line-height: 1.35;
}

.review-summary {
  color: var(--text-soft);
  line-height: 1.8;
  font-size: 1rem;
  white-space: normal;
  overflow-wrap: anywhere;
}

.review-takeaway {
  padding: 1rem 1.05rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--surface-soft);
  color: var(--text);
  line-height: 1.7;
  white-space: normal;
  overflow-wrap: anywhere;
}

.review-answer,
.review-reference {
  color: var(--text-soft);
  line-height: 1.7;
  white-space: normal;
  overflow-wrap: anywhere;
}

.review-answer {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--accent-soft) 58%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
}

.review-reference {
  font-size: 0.92rem;
  color: var(--text-dim);
}

.review-answer strong,
.review-reference strong {
  color: var(--text);
}

.session-insight {
  margin-bottom: 1rem;
  padding: 1rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  color: var(--text-soft);
  line-height: 1.7;
}

.weak-list,
.preset-list {
  display: grid;
  gap: 0.75rem;
}

.help-list {
  display: grid;
  gap: 0.75rem;
}

.weak-item,
.preset-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
}

.weak-copy,
.preset-copy {
  flex: 1;
  min-width: 220px;
}

.preset-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.help-item {
  display: grid;
  gap: 0.22rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
}

.help-item strong {
  color: var(--text);
  font-size: 0.92rem;
}

.help-item span {
  color: var(--text-dim);
  line-height: 1.55;
  font-size: 0.84rem;
}

.weak-title,
.preset-title {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text);
}

.weak-meta,
.preset-meta {
  margin-top: 0.2rem;
  color: var(--text-dim);
  font-size: 0.82rem;
  line-height: 1.5;
}

.weak-score {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gold);
}

.data-feedback {
  margin-top: 0.9rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--border);
  color: var(--text-dim);
  line-height: 1.6;
  font-size: 0.85rem;
}

.data-feedback.is-success {
  border-color: rgba(49, 199, 114, 0.35);
  background: var(--correct-bg);
  color: var(--text);
}

.data-feedback.is-error {
  border-color: rgba(255, 107, 107, 0.35);
  background: var(--wrong-bg);
  color: var(--text);
}

.danger-card {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in srgb, var(--wrong) 28%, var(--border));
  background: color-mix(in srgb, var(--wrong-bg) 68%, var(--surface));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
}

.danger-copy {
  flex: 1;
  min-width: 220px;
}

.danger-title {
  color: var(--text);
  font-weight: 700;
  font-size: 0.95rem;
}

.danger-meta {
  margin-top: 0.24rem;
  color: var(--text-dim);
  line-height: 1.55;
  font-size: 0.82rem;
}

.about-block {
  display: grid;
  gap: 1.25rem;
}

.mode-explainer {
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  border-left: 3px solid var(--accent);
  background: var(--surface-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.mode-explainer p {
  color: var(--text-soft);
  line-height: 1.7;
  font-size: 0.9rem;
  margin: 0;
}

.about-bio p {
  color: var(--text-soft);
  line-height: 1.75;
  font-size: 0.95rem;
}

.about-bio p + p {
  margin-top: 0.75rem;
}

.about-contact {
  padding: 1rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
}

.about-contact p {
  margin: 0.5rem 0 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
  font-size: 0.9rem;
}

.app-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0 0 1.5rem;
  color: var(--text-dim);
  font-size: 0.8rem;
}

@media (max-width: 720px) {
  .app-footer {
    justify-content: flex-start;
  }
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(92vw, 460px);
  padding: 1.1rem;
  border-radius: calc(var(--radius-xl) + 2px);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  z-index: 50;
}

.modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
}

.modal-body {
  display: grid;
  gap: 0.95rem;
}

.field input[type='text'] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--text);
  padding: 0.82rem 0.9rem;
  font: inherit;
}

.field input[type='text']:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-soft) 70%, transparent);
}

.toolbar-group,
.flag-preview,
.confidence-actions,
.flag-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.flag-preview {
  align-items: center;
}

.mini-flag,
.flag-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
}

.mini-flag {
  padding: 0.42rem 0.7rem;
  background: color-mix(in srgb, var(--accent-soft) 82%, var(--surface-soft));
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--border));
  box-shadow: 0 6px 14px color-mix(in srgb, var(--accent) 10%, transparent);
  font-size: 0.78rem;
}

.flag-panel,
.confidence-panel {
  margin-bottom: 1rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
}

.flag-chip {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  padding: 0.55rem 0.82rem;
  font-size: 0.8rem;
}

.flag-chip.active,
.flag-chip:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--accent-soft);
  color: var(--text);
}

.confidence-label {
  margin-bottom: 0.7rem;
  color: var(--text-soft);
  font-size: 0.86rem;
  font-weight: 600;
}

.confidence-btn.is-active {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--accent-soft);
}

.q-id-badge,
.q-counter {
  color: var(--text-dim);
}

.q-id-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  font-size: 0.74rem;
  font-family: var(--font-mono);
}

.q-counter {
  font-size: 0.84rem;
}

.q-stem {
  margin-bottom: 1.25rem;
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.8;
  letter-spacing: -0.01em;
}

.options {
  display: grid;
  gap: 0.8rem;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  width: 100%;
  padding: 1rem 1.05rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  color: var(--text);
  text-align: left;
  line-height: 1.6;
}

.option-btn:hover:not(.locked),
.option-btn.is-selected:not(.locked) {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--accent-soft);
}

.option-btn .letter {
  display: inline-grid;
  place-items: center;
  min-width: 2rem;
  min-height: 2rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--accent);
  font-weight: 700;
}

.option-btn.correct {
  border-color: rgba(49, 199, 114, 0.45);
  background: var(--correct-bg);
}

.option-btn.correct .letter {
  color: var(--correct);
}

.option-btn.wrong {
  border-color: rgba(240, 93, 103, 0.45);
  background: var(--wrong-bg);
}

.option-btn.wrong .letter {
  color: var(--wrong);
}

.option-btn.locked {
  cursor: default;
  opacity: 0.82;
}

.rationale-box {
  margin-top: 1rem;
  padding: 1rem 1rem 1rem 1.1rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--surface-soft);
  animation: fadeIn 180ms ease;
}

.rationale-box .ref {
  margin-top: 0.7rem;
  color: var(--text-dim);
  font-size: 0.82rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
  margin-bottom: 1.15rem;
}

.domain-list {
  display: grid;
  gap: 0.85rem;
}

.domain-bar {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(120px, 2fr) auto;
  gap: 0.85rem;
  align-items: center;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--border);
}

.domain-bar:last-child {
  border-bottom: none;
}

.domain-bar .name {
  font-size: 0.95rem;
}

.domain-bar small {
  display: block;
  margin-top: 0.3rem;
  color: var(--text-dim);
  font-size: 0.74rem;
}

.bar-bg {
  overflow: hidden;
  height: 0.6rem;
  border-radius: 999px;
  background: var(--surface-soft);
}

.bar-fill {
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.domain-bar .pct {
  min-width: 3.25rem;
  text-align: right;
  font-size: 0.95rem;
}

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

.summary-table {
  width: 100%;
  border-collapse: collapse;
}

.summary-table th,
.summary-table td {
  padding: 0.9rem 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 0.92rem;
}

.summary-table th {
  color: var(--text-dim);
  font-weight: 600;
}

.summary-table .right {
  color: var(--correct);
  font-weight: 700;
}

.summary-table .wrong-text {
  color: var(--wrong);
  font-weight: 700;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
  gap: 0.5rem;
}

.nav-grid button {
  min-height: 2.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  color: var(--text-dim);
  font-size: 0.84rem;
  font-weight: 700;
}

.nav-grid button.is-answered {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--border));
  background: var(--accent);
  color: var(--accent-contrast);
}

.nav-grid button.is-current {
  box-shadow: 0 0 0 3px var(--gold-soft);
  border-color: var(--gold);
}

.nav-grid button.is-flagged {
  position: relative;
}

.nav-grid button.is-flagged::after {
  content: "";
  position: absolute;
  top: 3px;
  right: 3px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--gold);
  box-shadow: 0 0 0 1.5px var(--surface-soft);
}

.test-flag-btn {
  border-color: var(--border);
  background: var(--surface-soft);
  color: var(--text-dim);
}

.test-flag-btn.is-flagged {
  border-color: color-mix(in srgb, var(--gold) 55%, var(--border));
  background: var(--gold-soft);
  color: var(--text);
}

.timer-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.timer-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.timer-sub.is-warning {
  color: var(--wrong);
  font-weight: 600;
}

.history-list {
  display: grid;
  gap: 0.75rem;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
}

.history-icon {
  display: inline-grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
}

.history-copy {
  flex: 1;
  min-width: 0;
}

.history-title {
  font-size: 0.92rem;
}

.history-time {
  margin-top: 0.2rem;
  color: var(--text-dim);
  font-size: 0.8rem;
}

.history-score {
  font-size: 1.1rem;
  font-weight: 700;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(2, 8, 23, 0.45);
  backdrop-filter: blur(4px);
}

.settings-panel {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 50;
  width: min(380px, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: color-mix(in srgb, var(--surface-strong) 94%, transparent);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(18px);
}

.settings-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.settings-section + .settings-section {
  margin-top: 1.1rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--border);
}

.settings-section p {
  color: var(--text-dim);
  line-height: 1.6;
  font-size: 0.9rem;
}

.segmented {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.45rem;
  width: 100%;
}

.segmented-btn {
  min-height: 2.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--text);
  font-weight: 700;
}

.segmented-btn.is-active {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--accent-soft);
}

.accent-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.accent-swatch {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-height: 3rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--text);
}

.accent-swatch span {
  width: 1rem;
  height: 1rem;
  border-radius: 999px;
  background: var(--swatch-color, var(--accent));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28);
}

.accent-swatch[data-accent="teal"] span { --swatch-color: #41c8c6; }
.accent-swatch[data-accent="blue"] span { --swatch-color: #4b82ff; }
.accent-swatch[data-accent="emerald"] span { --swatch-color: #22c98b; }
.accent-swatch[data-accent="rose"] span { --swatch-color: #ef648d; }
.accent-swatch[data-accent="amber"] span { --swatch-color: #e9a931; }

.accent-swatch.is-active {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  background: var(--accent-soft);
}

.toast {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 70;
  padding: 0.92rem 1.1rem;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--accent-contrast);
  font-weight: 700;
  box-shadow: var(--shadow-md);
  animation: fadeIn 180ms ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .nav {
    justify-self: stretch;
    flex-wrap: wrap;
  }

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

@media (max-width: 720px) {
  .container {
    width: min(calc(100% - 1rem), var(--max-width));
    padding-top: 1rem;
  }

  .card {
    padding: 1.15rem;
    border-radius: 20px;
  }

  .section-head {
    flex-direction: column;
  }

  .score-bar {
    flex-wrap: wrap;
  }

  .hero-top,
  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .exam-overview-head,
  .exam-overview-foot {
    flex-direction: column;
    align-items: stretch;
  }

  .exam-breakdown {
    grid-template-columns: 1fr;
  }

  .domain-bar {
    grid-template-columns: 1fr;
  }

  .actions .spacer,
  .score-bar .spacer {
    display: none;
  }

  .topbar-actions {
    flex-wrap: wrap;
  }

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

  .compact-focus-grid {
    grid-template-columns: 1fr;
  }

  .vertical-setup-stack,
  .compact-setup-card .focus-grid + .compact-control-row {
    max-width: none;
  }

  .nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    padding: 0.25rem;
  }

  .nav button {
    padding: 0.65rem 0.3rem;
    font-size: 0.82rem;
    text-align: center;
  }

  .flashcard-stage {
    padding: 1rem;
  }
}

@media (max-width: 520px) {
  .topbar {
    padding: 0.8rem 0.6rem;
    gap: 0.6rem;
  }

  .nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    width: 100%;
    border-radius: 18px;
    padding: 0.25rem;
  }

  .nav button {
    flex: none;
    min-width: 0;
    padding: 0.6rem 0.2rem;
    font-size: 0.72rem;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .status-pill,
  .icon-btn {
    width: 100%;
    justify-content: center;
  }

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