:root {
  color-scheme: light;
  --page: #f5f7fb;
  --surface: #ffffff;
  --ink: #0a1947;
  --ink-soft: #33456b;
  --muted: #62718d;
  --line: #d6deea;
  --line-strong: #9aabc5;
  --blue: #0b4edb;
  --blue-deep: #093eb4;
  --blue-soft: #edf3ff;
  --green: #057a3d;
  --green-deep: #045f31;
  --green-soft: #f0faf4;
  --red: #b42318;
  --red-soft: #fff2f0;
  --sidebar: #fbfcfe;
  --grid-line: rgba(10, 25, 71, 0.025);
  --section-current: linear-gradient(
    90deg,
    #edf3ff 0%,
    rgba(237, 243, 255, 0.2) 100%
  );
  --progress-track: #d7dde6;
  --disabled-ink: #8795ac;
  --disabled-surface: #e9edf3;
  --shadow: 0 20px 48px rgba(16, 42, 87, 0.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --content-width: 1180px;
  font-family:
    "Segoe UI",
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  font-synthesis: none;
}

[hidden] {
  display: none !important;
}

[data-theme="dark"] {
  color-scheme: dark;
  --page: #070d18;
  --surface: #101827;
  --ink: #f1f5ff;
  --ink-soft: #c3cce0;
  --muted: #93a1bb;
  --line: #25354d;
  --line-strong: #51627b;
  --blue: #75a7ff;
  --blue-deep: #a5c4ff;
  --blue-soft: #172945;
  --green: #43d17f;
  --green-deep: #8bebaf;
  --green-soft: #102c20;
  --red: #ff8c83;
  --red-soft: #37191c;
  --sidebar: #0c1423;
  --grid-line: rgba(166, 190, 231, 0.045);
  --section-current: linear-gradient(
    90deg,
    rgba(47, 94, 168, 0.35) 0%,
    rgba(23, 41, 69, 0.18) 100%
  );
  --progress-track: #2a3950;
  --disabled-ink: #71819a;
  --disabled-surface: #1b2739;
  --shadow: 0 20px 48px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--page);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    var(--page);
  background-size: 100% 64px;
  -webkit-font-smoothing: antialiased;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

a {
  color: var(--blue);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--blue-deep);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--surface);
  background: var(--ink);
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell {
  display: grid;
  min-height: 100vh;
  grid-template-rows: auto 1fr auto;
  background: var(--surface);
}

.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
  padding: 0 34px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--ink);
  font-size: clamp(1.45rem, 2.15vw, 2rem);
  font-weight: 720;
  letter-spacing: -0.045em;
  text-decoration: none;
}

.brand:hover {
  color: var(--ink);
}

.brand-mark-frame {
  display: grid;
  width: 50px;
  height: 50px;
  overflow: hidden;
  place-items: center;
  border-radius: 5px;
}

.brand-mark {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.68);
}

.topbar-meta,
.score-label {
  display: flex;
  align-items: center;
}

.topbar-meta {
  gap: 25px;
  color: var(--ink-soft);
  font-size: 1rem;
}

.cloud-sync-toggle {
  position: relative;
  display: grid;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  place-items: center;
  padding: 0;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  cursor: pointer;
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.cloud-sync-toggle:hover {
  color: var(--blue);
  background: var(--blue-soft);
  border-color: var(--blue);
  transform: translateY(-1px);
}

.cloud-status-dot {
  position: absolute;
  right: -1px;
  bottom: 1px;
  width: 10px;
  height: 10px;
  background: var(--muted);
  border: 2px solid var(--surface);
  border-radius: 50%;
}

.cloud-sync-check {
  opacity: 0;
}

.cloud-sync-toggle[data-cloud-status="signed-out"] {
  color: var(--blue);
  background: var(--blue-soft);
}

.cloud-sync-toggle[data-cloud-status="syncing"] {
  color: var(--blue);
  background: var(--blue-soft);
}

.cloud-sync-toggle[data-cloud-status="syncing"] svg {
  animation: cloud-pulse 1.4s ease-in-out infinite;
}

.cloud-sync-toggle[data-cloud-status="syncing"] .cloud-status-dot {
  background: var(--blue);
}

.cloud-sync-toggle[data-cloud-status="synced"] {
  color: var(--green);
  background: var(--green-soft);
  border-color: var(--green);
}

.cloud-sync-toggle[data-cloud-status="synced"] .cloud-sync-check {
  opacity: 1;
}

.cloud-sync-toggle[data-cloud-status="synced"] .cloud-status-dot {
  background: var(--green);
}

.cloud-sync-toggle[data-cloud-status="error"] {
  color: var(--red);
  background: var(--red-soft);
  border-color: var(--red);
}

.cloud-sync-toggle[data-cloud-status="error"] .cloud-status-dot {
  background: var(--red);
}

.theme-toggle {
  position: relative;
  display: grid;
  width: 54px;
  height: 30px;
  flex: 0 0 auto;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  justify-items: center;
  padding: 3px;
  color: var(--blue);
  background: var(--blue-soft);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
  transition:
    color 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease;
}

.theme-toggle:hover {
  border-color: var(--blue);
}

.theme-toggle-icon {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.theme-toggle-moon {
  color: var(--muted);
}

.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  background: var(--surface);
  border-radius: 50%;
  box-shadow: 0 2px 7px rgba(10, 25, 71, 0.22);
  transition:
    background-color 180ms ease,
    transform 180ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="dark"] .theme-toggle {
  color: var(--surface);
  background: var(--blue);
  border-color: var(--blue);
}

[data-theme="dark"] .theme-toggle-sun {
  color: var(--surface);
}

[data-theme="dark"] .theme-toggle-moon {
  color: var(--blue);
}

[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(24px);
}

.timer {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  white-space: nowrap;
}

.timer-icon {
  color: var(--blue);
}

.timer-copy {
  display: grid;
  gap: 1px;
}

.timer-label {
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 720;
  letter-spacing: 0.055em;
  line-height: 1;
  text-transform: uppercase;
}

.timer-value {
  min-width: 72px;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.timer-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.timer-toggle {
  min-width: 58px;
  padding: 7px 10px;
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 720;
  line-height: 1;
  background: var(--blue-soft);
  border: 1px solid rgba(11, 78, 219, 0.2);
  border-radius: 999px;
  cursor: pointer;
  transition:
    color 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease;
}

.timer-reset {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px 9px;
  color: var(--ink-soft);
  font-size: 0.74rem;
  font-weight: 690;
  line-height: 1;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
  transition:
    color 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease;
}

.timer-reset:hover {
  color: var(--blue);
  background: var(--blue-soft);
  border-color: rgba(11, 78, 219, 0.28);
}

.timer-toggle:hover {
  color: var(--surface);
  background: var(--blue);
  border-color: var(--blue);
}

.timer.is-running .timer-icon {
  animation: timer-pulse 1.8s ease-in-out infinite;
}

.timer.is-warning,
.timer.is-warning .timer-icon,
.timer.is-expired,
.timer.is-expired .timer-icon {
  color: var(--red);
}

.timer.is-warning .timer-toggle,
.timer.is-expired .timer-toggle {
  color: var(--red);
  background: var(--red-soft);
  border-color: rgba(181, 35, 48, 0.24);
}

.timer-toggle:disabled {
  cursor: default;
  opacity: 0.72;
}

.score-label {
  gap: 9px;
  color: var(--green);
  white-space: nowrap;
}

.score-label strong {
  font-weight: 650;
}

.meta-divider {
  width: 1px;
  height: 34px;
  background: var(--line);
}

.question-count {
  color: var(--ink);
  font-weight: 570;
  white-space: nowrap;
}

.quiz-layout {
  display: grid;
  min-height: 0;
  grid-template-columns: minmax(260px, 300px) minmax(0, 1fr);
  background: var(--surface);
  transition: grid-template-columns 240ms cubic-bezier(0.22, 1, 0.36, 1);
}

.section-nav {
  min-width: 0;
  overflow: hidden;
  padding: 28px 0;
  background: var(--sidebar);
  border-right: 1px solid var(--line);
}

.section-toolbar {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 0 20px 22px 24px;
}

.test-picker {
  display: grid;
  min-width: 0;
  flex: 1;
  gap: 7px;
}

.test-picker label {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 760;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.test-select-wrap {
  position: relative;
  display: block;
}

.test-select-wrap select {
  width: 100%;
  min-height: 42px;
  appearance: none;
  padding: 9px 36px 9px 12px;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 650;
  background: var(--surface);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.test-select-wrap svg {
  position: absolute;
  top: 50%;
  right: 11px;
  color: var(--blue);
  pointer-events: none;
  transform: translateY(-50%);
}

.sidebar-toggle {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  padding: 0;
  color: var(--blue);
  background: var(--surface);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    color 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease;
}

.sidebar-toggle:hover {
  color: var(--surface);
  background: var(--blue);
  border-color: var(--blue);
}

.sidebar-toggle svg {
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.section-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.section-button {
  position: relative;
  display: grid;
  width: 100%;
  min-height: 70px;
  grid-template-columns: 48px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 14px;
  padding: 12px 24px;
  color: var(--ink);
  text-align: left;
  background: transparent;
  border: 0;
  cursor: pointer;
  transition:
    color 160ms ease,
    background-color 160ms ease,
    padding 220ms ease;
}

.section-button::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  content: "";
  background: transparent;
}

.section-button:hover {
  background: var(--blue-soft);
}

.section-button.is-current {
  background: var(--section-current);
}

.section-button.is-current::before {
  background: var(--blue);
}

.section-number {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  color: var(--blue);
  font-size: 1.18rem;
  font-weight: 650;
  border: 1.5px solid var(--blue);
  border-radius: var(--radius-sm);
}

.section-copy {
  display: grid;
  gap: 4px;
  font-size: 1rem;
  font-weight: 630;
  line-height: 1.24;
}

.section-copy small {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 560;
}

.section-state {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  color: var(--line-strong);
  border: 1.5px solid currentColor;
  border-radius: 50%;
}

.section-button.is-complete .section-state {
  color: var(--green);
}

.section-button.is-complete .section-state svg {
  display: block;
}

.section-state svg {
  display: none;
  width: 15px;
  height: 15px;
}

.mobile-progress-label {
  display: none;
}

.is-sidebar-collapsed .quiz-layout {
  grid-template-columns: 86px minmax(0, 1fr);
}

.is-sidebar-collapsed .section-toolbar {
  justify-content: center;
  padding: 0 0 22px;
}

.is-sidebar-collapsed .test-picker {
  display: none;
}

.is-sidebar-collapsed .sidebar-toggle svg {
  transform: rotate(180deg);
}

.is-sidebar-collapsed .section-button {
  display: grid;
  grid-template-columns: 46px;
  justify-content: center;
  padding-inline: 0;
}

.is-sidebar-collapsed .section-copy,
.is-sidebar-collapsed .section-state {
  display: none;
}

.quiz-workspace {
  width: 100%;
  min-width: 0;
  padding: 28px clamp(28px, 4vw, 54px) 22px;
  outline: none;
}

.quiz-view,
.results-view {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
}

.question-meta {
  margin-bottom: 24px;
}

.function-label {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  font-weight: 680;
  letter-spacing: -0.01em;
}

.progress-track {
  position: relative;
  width: 100%;
  height: 6px;
  overflow: hidden;
  background: var(--progress-track);
  border-radius: 999px;
}

.progress-bar {
  display: block;
  width: 25%;
  height: 100%;
  background: var(--blue);
  border-radius: inherit;
  transition: width 440ms cubic-bezier(0.22, 1, 0.36, 1);
}

.question-region {
  animation: question-in 300ms ease both;
}

.question-heading {
  max-width: 1040px;
  margin: 0 0 22px;
  font-size: clamp(1.65rem, 2.7vw, 2.05rem);
  font-weight: 690;
  line-height: 1.22;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.question-style {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 720;
  letter-spacing: 0.02em;
}

.answers {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  border: 0;
}

.answer-choice {
  width: 100%;
  overflow: hidden;
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 0 rgba(10, 25, 71, 0.03);
  transition:
    transform 150ms ease,
    border-color 150ms ease,
    background-color 150ms ease,
    box-shadow 150ms ease;
}

.answer-choice:not(.is-locked):hover {
  z-index: 1;
  border-color: var(--blue);
  box-shadow: 0 8px 24px rgba(11, 78, 219, 0.09);
  transform: translateY(-2px);
}

.answer-button {
  display: block;
  width: 100%;
  padding: 0;
  color: inherit;
  text-align: left;
  background: transparent;
  border: 0;
  border-radius: inherit;
  cursor: pointer;
}

.answer-topline {
  display: grid;
  min-height: 64px;
  grid-template-columns: 42px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 12px;
  padding: 13px 20px;
}

.answer-letter {
  font-size: 1.25rem;
  font-weight: 760;
}

.answer-text {
  font-size: clamp(1rem, 1.65vw, 1.18rem);
  font-weight: 500;
  line-height: 1.42;
}

.answer-indicator {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  color: var(--line-strong);
  border: 1.5px solid currentColor;
  border-radius: 50%;
}

.answer-indicator svg {
  width: 15px;
  height: 15px;
  opacity: 0;
}

.answer-button[aria-disabled="true"] {
  cursor: default;
}

.answer-choice.is-correct {
  color: var(--green-deep);
  background: var(--green-soft);
  border-color: var(--green);
  box-shadow: 0 0 0 1px rgba(5, 122, 61, 0.08);
}

.answer-choice.is-correct .answer-indicator {
  color: var(--surface);
  background: var(--green);
  border-color: var(--green);
  animation: success-pop 420ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.answer-choice.is-correct .answer-indicator svg {
  opacity: 1;
}

.answer-choice.is-incorrect {
  color: var(--red);
  background: var(--red-soft);
  border-color: var(--red);
  animation: gentle-shake 320ms ease;
}

.answer-choice.is-incorrect .answer-indicator {
  color: var(--surface);
  background: var(--red);
  border-color: var(--red);
}

.answer-choice.is-incorrect .answer-indicator svg {
  opacity: 1;
}

.answer-retry-hint {
  display: block;
  padding: 11px 20px 12px 74px;
  color: var(--red);
  font-size: 0.82rem;
  font-weight: 720;
  letter-spacing: 0.01em;
  border-top: 1px solid rgba(183, 28, 28, 0.24);
}

.answer-explanation {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 20px 16px 62px;
  color: var(--ink);
  border-top: 1px solid rgba(5, 122, 61, 0.38);
  animation: explanation-open 360ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.answer-explanation-icon {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  color: var(--green);
  border: 1.5px solid currentColor;
  border-radius: 50%;
}

.answer-explanation-icon svg {
  width: 18px;
  height: 18px;
}

.answer-explanation p {
  margin: 1px 0 0;
  font-size: 0.98rem;
  line-height: 1.48;
}

.answer-explanation strong {
  color: var(--green-deep);
}

.review-cues {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
  gap: 14px;
  margin: 12px 0 0;
}

.review-cues > div {
  min-width: 0;
  padding-top: 9px;
  border-top: 1px solid rgba(5, 122, 61, 0.22);
}

.review-cues dt {
  margin: 0 0 3px;
  color: var(--green-deep);
  font-size: 0.7rem;
  font-weight: 760;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.review-cues dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
  line-height: 1.4;
}

.question-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 20px;
}

.button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 1rem;
  font-weight: 650;
  line-height: 1;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    transform 150ms ease,
    background-color 150ms ease,
    border-color 150ms ease,
    box-shadow 150ms ease,
    opacity 150ms ease;
}

.button:not(:disabled):hover {
  transform: translateY(-2px);
}

.button-secondary {
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--blue);
}

.button-secondary:hover {
  background: var(--blue-soft);
  box-shadow: 0 8px 22px rgba(11, 78, 219, 0.08);
}

.button-primary {
  min-width: 176px;
  color: var(--surface);
  background: var(--blue);
  border: 1.5px solid var(--blue);
  box-shadow: 0 8px 20px rgba(11, 78, 219, 0.2);
}

.button-primary:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
}

.button:disabled {
  color: var(--disabled-ink);
  background: var(--disabled-surface);
  border-color: var(--disabled-surface);
  box-shadow: none;
  cursor: not-allowed;
}

.results-view {
  padding: 20px 0 24px;
  animation: question-in 320ms ease both;
}

.results-kicker {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 1rem;
  font-weight: 700;
}

.results-heading {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3.75rem);
  letter-spacing: -0.055em;
}

.results-summary {
  max-width: 650px;
  margin: 16px 0 32px;
  color: var(--ink-soft);
  font-size: 1.08rem;
  line-height: 1.65;
}

.result-score {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--green);
}

.result-score strong {
  font-size: clamp(3rem, 7vw, 5.2rem);
  line-height: 1;
  letter-spacing: -0.07em;
}

.result-score span {
  color: var(--muted);
  font-size: 1.15rem;
  font-weight: 600;
}

.result-list {
  display: grid;
  gap: 10px;
  max-width: 880px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
}

.result-item {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.result-item-number {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--blue);
  font-weight: 700;
  border: 1px solid currentColor;
  border-radius: var(--radius-sm);
}

.result-item-copy strong,
.result-item-copy span {
  display: block;
}

.result-item-copy strong {
  margin-bottom: 3px;
}

.result-item-copy span {
  color: var(--muted);
  font-size: 0.92rem;
}

.result-status {
  font-size: 0.9rem;
  font-weight: 720;
}

.result-status.is-correct {
  color: var(--green);
}

.result-status.is-incorrect {
  color: var(--red);
}

.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.study-sequence {
  max-width: 880px;
  margin: 0 0 26px;
  padding: 20px 22px;
  background: var(--blue-soft);
  border-left: 3px solid var(--blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.study-sequence h2 {
  margin: 0 0 12px;
  font-size: 1.12rem;
  letter-spacing: -0.02em;
}

.study-sequence ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
  margin: 0;
  padding-left: 20px;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.48;
}

.study-sequence strong {
  color: var(--ink);
}

.app-footer {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 34px;
  color: var(--muted);
  font-size: 0.87rem;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.app-footer p {
  margin: 0;
}

.cloud-sync-dialog {
  width: min(470px, calc(100vw - 32px));
  max-height: min(720px, calc(100vh - 32px));
  padding: 0;
  overflow: auto;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 28px 80px rgba(4, 14, 34, 0.28);
}

.cloud-sync-dialog::backdrop {
  background: rgba(4, 14, 34, 0.58);
  backdrop-filter: blur(4px);
}

.cloud-sync-dialog[open] {
  animation: dialog-in 220ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.cloud-dialog-header {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 26px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.cloud-dialog-kicker {
  margin: 0 0 5px;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 760;
  letter-spacing: 0.065em;
  text-transform: uppercase;
}

.cloud-dialog-header h2 {
  margin: 0;
  font-size: 1.65rem;
  letter-spacing: -0.035em;
}

.cloud-dialog-close {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  place-items: center;
  padding: 0;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 50%;
  cursor: pointer;
}

.cloud-dialog-close:hover {
  color: var(--ink);
  background: var(--blue-soft);
  border-color: var(--blue);
}

.cloud-dialog-body {
  padding: 26px;
}

.cloud-view {
  text-align: center;
}

.cloud-view h3 {
  margin: 14px 0 8px;
  font-size: 1.24rem;
  letter-spacing: -0.025em;
}

.cloud-view > p {
  max-width: 380px;
  margin: 0 auto;
  color: var(--ink-soft);
  line-height: 1.55;
}

.cloud-state-icon {
  display: grid;
  width: 60px;
  height: 60px;
  margin: 0 auto;
  place-items: center;
  color: var(--muted);
  background: var(--page);
  border: 1px solid var(--line);
  border-radius: 50%;
}

.cloud-state-icon.is-ready {
  color: var(--blue);
  background: var(--blue-soft);
  border-color: var(--blue);
}

.cloud-state-icon.is-synced {
  width: 48px;
  height: 48px;
  margin: 0;
  color: var(--green);
  background: var(--green-soft);
  border-color: var(--green);
}

.google-signin-button {
  display: flex;
  width: 100%;
  min-height: 50px;
  margin-top: 22px;
  align-items: center;
  justify-content: center;
  gap: 11px;
  color: var(--ink);
  font: inherit;
  font-weight: 720;
  background: var(--surface);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    border-color 150ms ease,
    background 150ms ease,
    transform 150ms ease;
}

.google-signin-button:hover:not(:disabled) {
  background: var(--page);
  border-color: var(--blue);
  transform: translateY(-1px);
}

.google-signin-button:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--blue) 28%, transparent);
  outline-offset: 2px;
}

.google-signin-button:disabled {
  cursor: wait;
  opacity: 0.68;
}

.google-signin-button svg {
  flex: 0 0 auto;
}

.cloud-auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 18px 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.cloud-auth-divider::before,
.cloud-auth-divider::after {
  height: 1px;
  flex: 1;
  content: "";
  background: var(--line);
}

.cloud-form {
  display: grid;
  gap: 10px;
  margin-top: 0;
  text-align: left;
}

.cloud-form label {
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 720;
}

.cloud-form input {
  width: 100%;
  min-height: 50px;
  padding: 11px 13px;
  color: var(--ink);
  font: inherit;
  background: var(--surface);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
}

.cloud-form input::placeholder {
  color: var(--muted);
}

.cloud-form input:focus {
  border-color: var(--blue);
}

.cloud-form .button {
  width: 100%;
  margin-top: 2px;
}

.cloud-account-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px;
  text-align: left;
  background: var(--green-soft);
  border: 1px solid var(--green);
  border-radius: var(--radius-md);
}

.cloud-account-copy {
  display: grid;
  min-width: 0;
  gap: 3px;
}

.cloud-account-copy strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cloud-account-copy span {
  color: var(--green-deep);
  font-size: 0.82rem;
}

.cloud-account-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

.cloud-account-actions .button {
  width: 100%;
  min-width: 0;
}

.cloud-auth-message {
  min-height: 43px;
  margin: 22px 0 0;
  padding: 11px 13px;
  color: var(--ink-soft);
  font-size: 0.85rem;
  line-height: 1.45;
  text-align: center;
  background: var(--page);
  border-radius: var(--radius-sm);
}

.cloud-auth-message[data-tone="success"] {
  color: var(--green-deep);
  background: var(--green-soft);
}

.cloud-auth-message[data-tone="error"] {
  color: var(--red);
  background: var(--red-soft);
}

.cloud-free-note {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.45;
  text-align: center;
}

.cloud-free-note strong {
  color: var(--ink-soft);
}

.noscript-message {
  position: fixed;
  inset: auto 16px 16px;
  z-index: 200;
  margin: 0;
  padding: 14px 18px;
  color: #fff;
  background: var(--red);
  border-radius: var(--radius-sm);
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

:focus-visible {
  outline: 3px solid rgba(11, 78, 219, 0.32);
  outline-offset: 3px;
}

@keyframes question-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes explanation-open {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes success-pop {
  0% {
    transform: scale(0.72);
  }
  65% {
    transform: scale(1.14);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes gentle-shake {
  0%,
  100% {
    transform: translateX(0);
  }
  33% {
    transform: translateX(-4px);
  }
  66% {
    transform: translateX(4px);
  }
}

@keyframes timer-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.62;
    transform: scale(0.94);
  }
}

/* ProTester marketplace */

.brand-mark-frame {
  display: grid;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid currentColor;
  border-radius: 0;
  place-items: center;
  overflow: visible;
}

.brand-monogram {
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: -0.08em;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1.1rem, 3vw, 2.8rem);
}

.site-nav a,
.site-nav button {
  padding: 0.4rem 0;
  color: inherit;
  font: inherit;
  font-size: 0.9rem;
  text-decoration: none;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.site-nav a:hover,
.site-nav button:hover {
  color: var(--blue);
}

.account-button {
  display: inline-flex;
  min-height: 38px;
  padding: 0 0.9rem;
  align-items: center;
  gap: 0.5rem;
  color: var(--surface);
  font: inherit;
  font-weight: 700;
  border: 1px solid var(--blue);
  border-radius: 5px;
  background: var(--blue);
  cursor: pointer;
}

.account-button-dot {
  width: 7px;
  height: 7px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.account-button.is-signed-in .account-button-dot {
  border-color: var(--green);
  background: var(--green);
}

.is-marketplace .topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: grid;
  grid-template-columns: minmax(220px, auto) minmax(320px, 1fr) auto;
  min-height: 76px;
  padding: 0 clamp(1.25rem, 3vw, 3rem);
  color: #fff;
  border-bottom: 0;
  background: #071a3d;
}

.is-marketplace .brand {
  color: #fff;
}

.is-marketplace .brand:hover {
  color: #fff;
}

.is-marketplace .topbar-meta {
  gap: 0.7rem;
}

.is-marketplace .practice-label,
.is-marketplace .timer,
.is-marketplace .score-label,
.is-marketplace .question-count,
.is-marketplace .topbar-meta > .meta-divider {
  display: none;
}

.is-marketplace .cloud-sync-toggle {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.42);
  background: transparent;
}

.is-marketplace .theme-toggle {
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.08);
}

.is-marketplace .theme-toggle-icon {
  color: #fff;
}

.is-marketplace .theme-toggle-thumb {
  background: #fff;
}

.is-quiz .site-nav,
.is-quiz .account-button {
  display: none;
}

.marketplace-view {
  color: var(--ink);
  background: var(--page);
}

.market-hero,
.exam-library,
.pricing-section,
.independence-note {
  width: min(100%, 1380px);
  margin: 0 auto;
  padding-right: clamp(1.25rem, 4vw, 4rem);
  padding-left: clamp(1.25rem, 4vw, 4rem);
}

.market-hero {
  display: grid;
  min-height: 620px;
  padding-top: clamp(4rem, 7vw, 7rem);
  padding-bottom: clamp(4rem, 7vw, 7rem);
  grid-template-columns: minmax(0, 1.03fr) minmax(420px, 0.87fr);
  align-items: center;
  gap: clamp(3rem, 8vw, 8rem);
}

.market-hero h1 {
  max-width: 730px;
  margin: 0;
  font-size: clamp(3.6rem, 7vw, 6.6rem);
  line-height: 0.94;
  letter-spacing: -0.072em;
}

.market-hero-lede {
  max-width: 650px;
  margin: 2rem 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.1rem, 1.8vw, 1.38rem);
  line-height: 1.55;
}

.market-hero-actions {
  display: flex;
  margin-top: 2.25rem;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.market-hero-actions .button {
  min-height: 54px;
  padding: 0 1.6rem;
  text-decoration: none;
}

.market-proof-list {
  display: flex;
  padding: 0;
  margin: 3.2rem 0 0;
  flex-wrap: wrap;
  gap: 0;
  list-style: none;
}

.market-proof-list li {
  padding: 0 1.2rem;
  color: var(--ink-soft);
  font-size: 0.88rem;
  border-left: 1px solid var(--line);
}

.market-proof-list li:first-child {
  padding-left: 0;
  border-left: 0;
}

.market-proof-list strong {
  color: var(--blue);
  font-size: 1.05rem;
}

.practice-preview {
  padding: clamp(1.6rem, 3vw, 2.4rem);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.preview-progress-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.84rem;
}

.preview-progress-track {
  height: 5px;
  margin: 0.8rem 0 2rem;
  overflow: hidden;
  background: var(--progress-track);
}

.preview-progress-track span {
  display: block;
  width: 72%;
  height: 100%;
  background: var(--blue);
}

.practice-preview h2 {
  margin: 0 0 1.35rem;
  font-size: clamp(1.3rem, 2vw, 1.75rem);
  line-height: 1.28;
  letter-spacing: -0.025em;
}

.preview-answers {
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: preview-answer;
}

.preview-answers li {
  position: relative;
  min-height: 54px;
  padding: 0.9rem 1rem 0.9rem 3.25rem;
  margin-top: 0.62rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.35;
  border: 1px solid var(--line);
  border-radius: 4px;
  counter-increment: preview-answer;
}

.preview-answers li::before {
  position: absolute;
  top: 0.9rem;
  left: 1rem;
  content: counter(preview-answer, upper-alpha) ".";
  color: var(--muted);
  font-weight: 800;
}

.preview-answers li.is-correct {
  color: var(--green-deep);
  border-color: var(--green);
  background: var(--green-soft);
}

.preview-answers li.is-correct::after {
  position: absolute;
  top: 50%;
  right: 1rem;
  content: "✓";
  color: var(--green);
  font-weight: 800;
  transform: translateY(-50%);
}

.preview-explanation {
  margin: 1.25rem 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.45;
}

.preview-explanation strong {
  color: var(--green);
}

.exam-library {
  padding-top: clamp(4rem, 7vw, 6rem);
  padding-bottom: clamp(4rem, 7vw, 6rem);
  border-top: 1px solid var(--line);
}

.section-heading-row {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(360px, 1fr);
  gap: 2rem;
  align-items: end;
}

.section-kicker {
  margin: 0 0 0.6rem;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-heading-row h2,
.pricing-intro h2 {
  margin: 0;
  font-size: clamp(2.35rem, 4.4vw, 4.3rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

.section-heading-row > p,
.pricing-intro > p:last-child {
  max-width: 680px;
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.65;
}

.catalog-search {
  display: flex;
  width: min(100%, 660px);
  height: 52px;
  padding: 0 1rem;
  margin-top: 2.5rem;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
}

.catalog-search svg {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.catalog-search input {
  width: 100%;
  color: var(--ink);
  font: inherit;
  border: 0;
  outline: 0;
  background: transparent;
}

.category-filters {
  display: flex;
  padding-top: 1.3rem;
  overflow-x: auto;
  gap: 2rem;
  border-bottom: 1px solid var(--line);
}

.category-filter {
  position: relative;
  padding: 0.8rem 0 0.9rem;
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.88rem;
  border: 0;
  background: transparent;
  cursor: pointer;
  white-space: nowrap;
}

.category-filter.is-active {
  color: var(--blue);
  font-weight: 700;
}

.category-filter.is-active::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--blue);
}

.catalog-summary {
  margin: 1.15rem 0;
  color: var(--muted);
  font-size: 0.78rem;
}

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

.exam-card {
  display: flex;
  min-height: 390px;
  padding: 1.35rem;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
}

.exam-card.is-available {
  border-color: rgba(5, 122, 61, 0.55);
}

.exam-card-heading {
  display: grid;
  grid-template-columns: minmax(76px, auto) 1fr;
  gap: 1rem;
  align-items: start;
}

.exam-code {
  color: var(--ink);
  font-size: clamp(2.8rem, 4.5vw, 4.3rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.07em;
}

.exam-status {
  display: inline-block;
  padding: 0.25rem 0.45rem;
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.055em;
  border: 1px solid var(--line);
  border-radius: 3px;
  text-transform: uppercase;
}

.is-available .exam-status {
  color: var(--green-deep);
  border-color: rgba(5, 122, 61, 0.28);
  background: var(--green-soft);
}

.exam-card h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.exam-card-heading p {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.exam-description {
  min-height: 4.6rem;
  margin: 1.35rem 0 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
  line-height: 1.5;
}

.difficulty-markers {
  display: grid;
  padding: 1rem 0;
  margin-top: auto;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.25rem;
  border-top: 1px solid var(--line);
}

.difficulty-markers span {
  display: flex;
  min-width: 0;
  align-items: center;
  flex-direction: column;
  gap: 0.48rem;
  color: var(--muted);
  font-size: 0.58rem;
}

.difficulty-markers i {
  width: 9px;
  height: 9px;
  border: 1px solid var(--blue);
  border-radius: 50%;
}

.exam-card-footer {
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.exam-card-footer > span {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 700;
}

.exam-card-footer button {
  display: flex;
  width: 100%;
  min-height: 42px;
  padding: 0 0.9rem;
  align-items: center;
  justify-content: space-between;
  color: var(--blue);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: transparent;
  cursor: pointer;
}

.is-available .exam-card-footer button {
  color: #fff;
  border-color: var(--blue);
  background: var(--blue);
}

.catalog-empty {
  display: flex;
  min-height: 260px;
  padding: 3rem;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.5rem;
  color: var(--muted);
  border: 1px dashed var(--line-strong);
  grid-column: 1 / -1;
}

.pricing-section {
  padding-top: clamp(4rem, 8vw, 7rem);
  padding-bottom: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--line);
}

.pricing-intro {
  max-width: 860px;
}

.pricing-intro > p:last-child {
  margin-top: 1.5rem;
}

.pricing-grid {
  display: grid;
  max-width: 920px;
  margin-top: 3rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.pricing-card {
  position: relative;
  display: flex;
  min-height: 450px;
  padding: 2rem;
  flex-direction: column;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: var(--surface);
}

.pricing-card.is-featured {
  border-color: var(--blue);
}

.pricing-badge {
  position: absolute;
  top: -1px;
  right: 1.5rem;
  padding: 0.35rem 0.7rem;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--blue);
}

.pricing-label {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 800;
}

.pricing-price {
  margin: 1rem 0 1.4rem;
  color: var(--muted);
}

.pricing-price strong {
  color: var(--ink);
  font-size: 3.6rem;
  letter-spacing: -0.06em;
}

.pricing-card > p:nth-of-type(3) {
  color: var(--ink-soft);
}

.pricing-card ul {
  padding: 1.2rem 0 1.6rem;
  margin: 1rem 0 1.5rem;
  list-style: none;
  border-top: 1px solid var(--line);
}

.pricing-card li {
  position: relative;
  padding: 0.42rem 0 0.42rem 1.6rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.pricing-card li::before {
  position: absolute;
  left: 0;
  content: "✓";
  color: var(--green);
  font-weight: 800;
}

.pricing-card .button {
  width: 100%;
  margin-top: auto;
}

.text-button {
  padding: 0;
  margin: 1.5rem 0 0;
  color: var(--blue);
  font: inherit;
  border: 0;
  background: transparent;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.independence-note {
  display: flex;
  padding-top: 1.6rem;
  padding-bottom: 1.6rem;
  align-items: center;
  gap: 0.8rem;
  color: #dbe7ff;
  font-size: 0.82rem;
  background: #071a3d;
}

.marketplace-view > .independence-note {
  max-width: none;
  width: 100%;
  padding-right: max(clamp(1.25rem, 4vw, 4rem), calc((100vw - 1250px) / 2));
  padding-left: max(clamp(1.25rem, 4vw, 4rem), calc((100vw - 1250px) / 2));
}

.access-dialog,
.exam-preview-dialog {
  width: min(calc(100% - 2rem), 560px);
  padding: 2.2rem;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
}

.access-dialog::backdrop,
.exam-preview-dialog::backdrop {
  background: rgba(3, 11, 27, 0.72);
}

.dialog-close {
  position: absolute;
  top: 0.9rem;
  right: 1rem;
  width: 38px;
  height: 38px;
  color: var(--ink);
  font: inherit;
  font-size: 1.5rem;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.access-icon {
  display: grid;
  width: 60px;
  height: 60px;
  margin-bottom: 1.2rem;
  color: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 50%;
  place-items: center;
}

.access-dialog h2,
.exam-preview-dialog h2 {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.7rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.access-dialog > p:not(.section-kicker):not(.access-status):not(.stripe-trust-note),
.exam-preview-dialog > p:not(.section-kicker) {
  color: var(--ink-soft);
  line-height: 1.55;
}

.access-auth-actions {
  display: grid;
  margin: 1.4rem 0;
  gap: 0.65rem;
}

.access-auth-actions .google-signin-button,
.access-auth-actions .button {
  width: 100%;
}

.access-plan-actions {
  display: grid;
  gap: 0.65rem;
}

.access-plan-button {
  display: flex;
  width: 100%;
  min-height: 76px;
  padding: 0.9rem 1rem;
  align-items: center;
  justify-content: space-between;
  color: var(--ink);
  font: inherit;
  text-align: left;
  border: 1px solid var(--blue);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
}

.access-plan-button span,
.access-plan-button small {
  display: block;
}

.access-plan-button small {
  margin-top: 0.22rem;
  color: var(--muted);
}

.access-status {
  min-height: 1.4em;
  margin: 1rem 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.45;
}

.access-status[data-tone="warning"] {
  color: #9a5b00;
}

.access-status[data-tone="error"] {
  color: var(--red);
}

.stripe-trust-note {
  padding-top: 1rem;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.72rem;
  border-top: 1px solid var(--line);
}

.preview-difficulty-list {
  display: grid;
  padding: 1rem 0;
  margin: 1.4rem 0;
  grid-template-columns: repeat(5, 1fr);
  color: var(--blue);
  font-size: 0.72rem;
  text-align: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.exam-preview-dialog .button {
  width: 100%;
  margin-top: 0.65rem;
  text-decoration: none;
}

@media (max-width: 1060px) {
  .is-marketplace .topbar {
    grid-template-columns: auto 1fr auto;
  }

  .site-nav {
    display: none;
  }

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

  .practice-preview {
    max-width: 680px;
  }

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

@media (max-width: 720px) {
  .is-marketplace .topbar {
    min-height: 66px;
    padding: 0 1rem;
    grid-template-columns: 1fr auto;
  }

  .is-marketplace .brand-name {
    font-size: 1.05rem;
  }

  .is-marketplace .brand-mark-frame {
    width: 38px;
    height: 38px;
  }

  .is-marketplace .cloud-sync-toggle {
    display: none;
  }

  .is-marketplace .account-button {
    min-width: 38px;
    padding: 0 0.65rem;
  }

  .is-marketplace .account-button-dot {
    display: none;
  }

  .market-hero {
    min-height: 0;
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
    gap: 3rem;
  }

  .market-hero h1 {
    font-size: clamp(3.2rem, 15vw, 5rem);
  }

  .market-proof-list {
    display: grid;
    gap: 0.8rem;
  }

  .market-proof-list li {
    padding: 0;
    border-left: 0;
  }

  .section-heading-row {
    grid-template-columns: 1fr;
  }

  .exam-card-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .exam-card {
    min-height: 360px;
  }

  .pricing-card {
    min-height: 420px;
  }

  .independence-note {
    align-items: flex-start;
    flex-direction: column;
  }

  .access-dialog,
  .exam-preview-dialog {
    padding: 1.5rem;
  }
}

@keyframes cloud-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.62;
    transform: scale(0.92);
  }
}

@keyframes dialog-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 1120px) {
  .practice-label,
  .meta-divider:first-of-type {
    display: none;
  }
}

@media (max-width: 920px) {
  .practice-label,
  .meta-divider:first-of-type {
    display: none;
  }

  .topbar-meta {
    gap: 16px;
  }

  .quiz-layout {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .section-button {
    grid-template-columns: 42px minmax(0, 1fr) 22px;
    gap: 10px;
    padding-inline: 18px;
  }

  .section-toolbar {
    padding-inline: 18px;
  }

  .section-number {
    width: 40px;
    height: 40px;
  }

  .quiz-workspace {
    padding-inline: 32px;
  }
}

@media (max-width: 760px) {
  .app-shell {
    display: block;
    min-height: 100vh;
  }

  .topbar {
    min-height: 72px;
    padding: 0 18px;
  }

  .brand {
    gap: 9px;
    font-size: 1.25rem;
  }

  .brand-mark-frame {
    width: 40px;
    height: 40px;
  }

  .meta-divider,
  .question-count,
  .score-label {
    display: none;
  }

  .topbar-meta {
    gap: 10px;
    font-size: 0.92rem;
  }

  .timer {
    gap: 8px;
  }

  .timer-label {
    display: none;
  }

  .timer-toggle {
    min-width: 54px;
    padding-inline: 8px;
  }

  .timer-reset {
    padding-inline: 8px;
  }

  .quiz-layout {
    display: block;
  }

  .section-nav {
    position: relative;
    padding: 22px 22px 24px;
    background: var(--surface);
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .section-toolbar,
  .is-sidebar-collapsed .section-toolbar {
    max-width: 420px;
    align-items: end;
    margin: 0 auto 18px;
    padding: 0;
  }

  .is-sidebar-collapsed .test-picker {
    display: grid;
  }

  .test-picker label {
    text-align: center;
  }

  .sidebar-toggle {
    display: none;
  }

  .mobile-progress-label {
    display: block;
    margin: 0 0 18px;
    color: var(--ink);
    font-size: 0.95rem;
    font-weight: 650;
    text-align: center;
  }

  .section-list {
    position: relative;
    display: flex;
    max-width: 420px;
    justify-content: space-between;
    gap: 0;
    margin: 0 auto;
  }

  .section-list::before {
    position: absolute;
    top: 19px;
    right: 22px;
    left: 22px;
    height: 3px;
    content: "";
    background:
      linear-gradient(
        90deg,
        var(--blue) 0 var(--mobile-progress, 0%),
        var(--line) var(--mobile-progress, 0%) 100%
      );
    border-radius: 999px;
  }

  .section-list li {
    position: relative;
    z-index: 1;
  }

  .section-button {
    display: block;
    width: auto;
    min-height: 0;
    padding: 0;
    background: var(--surface);
    border-radius: var(--radius-sm);
  }

  .is-sidebar-collapsed .section-button {
    display: block;
    grid-template-columns: none;
    justify-content: normal;
    padding: 0;
  }

  .section-button::before,
  .section-copy,
  .section-state {
    display: none;
  }

  .section-button:hover,
  .section-button.is-current {
    background: var(--surface);
  }

  .section-number {
    width: 40px;
    height: 40px;
    background: var(--surface);
  }

  .section-button.is-current .section-number {
    color: var(--surface);
    background: var(--blue);
    box-shadow: 0 5px 14px rgba(11, 78, 219, 0.22);
  }

  .section-button.is-complete:not(.is-current) .section-number {
    color: var(--green);
    border-color: var(--green);
  }

  .quiz-workspace {
    padding: 28px 20px 32px;
  }

  .question-meta {
    margin-bottom: 26px;
  }

  .function-label {
    margin-bottom: 14px;
  }

  .question-heading {
    margin-bottom: 24px;
    font-size: clamp(1.48rem, 7.1vw, 2rem);
    line-height: 1.3;
  }

  .answers {
    gap: 12px;
  }

  .answer-topline {
    min-height: 68px;
    grid-template-columns: 34px minmax(0, 1fr) 24px;
    gap: 10px;
    padding: 14px 16px;
  }

  .answer-letter {
    font-size: 1.13rem;
  }

  .answer-text {
    font-size: 1rem;
  }

  .answer-retry-hint {
    padding: 11px 16px 12px 60px;
  }

  .answer-explanation {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 10px;
    padding: 18px 16px;
  }

  .answer-explanation-icon {
    width: 28px;
    height: 28px;
  }

  .answer-explanation p {
    font-size: 0.96rem;
    line-height: 1.55;
  }

  .review-cues {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .question-actions {
    margin-top: 22px;
  }

  .button {
    min-height: 50px;
    padding-inline: 16px;
  }

  .button-primary {
    min-width: 150px;
  }

  .app-footer {
    display: block;
    padding: 18px 20px 24px;
    text-align: center;
  }

  .app-footer p + p {
    margin-top: 8px;
  }

  .result-item {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .result-status {
    grid-column: 2;
  }

  .study-sequence ol {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .brand-name {
    display: none;
  }

  .cloud-dialog-header {
    padding: 20px 20px 17px;
  }

  .cloud-dialog-body {
    padding: 22px 20px;
  }
}

@media (max-width: 420px) {
  .topbar {
    padding-inline: 14px;
  }

  .brand {
    font-size: 1.18rem;
  }

  .cloud-sync-toggle {
    width: 38px;
    height: 38px;
  }

  .brand-mark-frame {
    width: 38px;
    height: 38px;
  }

  .timer-icon {
    display: none;
  }

  .timer-value {
    min-width: 68px;
    font-size: 0.92rem;
  }

  .timer-toggle {
    min-width: 50px;
    font-size: 0.7rem;
  }

  .timer-actions {
    gap: 4px;
  }

  .timer-reset {
    width: 32px;
    min-width: 32px;
    min-height: 30px;
    padding: 0;
  }

  .timer-reset span {
    display: none;
  }

  .section-nav {
    padding-inline: 18px;
  }

  .quiz-workspace {
    padding-inline: 16px;
  }

  .question-actions {
    align-items: stretch;
  }

  .question-actions .button {
    flex: 1;
    min-width: 0;
  }

  .question-actions .button span {
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}