/* =====================================================================
   CMA Study — components
   Class names follow reference/SecB-1.html. Colors come only from the
   semantic tokens in tokens.css so every component follows dark mode.
   ===================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}
button {
  -webkit-tap-highlight-color: transparent;
}
a {
  color: var(--accent-text);
  text-underline-offset: 2px;
}
[hidden] {
  display: none !important;
}
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.num,
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.icon {
  width: 1.1em;
  height: 1.1em;
  flex: 0 0 auto;
  vertical-align: -0.18em;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 14px;
  color: var(--on-brand);
  background: var(--brand);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}
.skip-link:focus {
  transform: translateY(0);
}

/* ---------- shell ---------- */
.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  color: var(--side-text);
  background: radial-gradient(circle at 10% 6%, rgba(20, 184, 166, 0.14), transparent 27%), var(--side-bg);
  border-right: 1px solid var(--side-border);
  scrollbar-width: thin;
  scrollbar-color: #284a66 transparent;
}
.brand {
  padding: 26px 24px 20px;
  border-bottom: 1px solid var(--side-border);
}
.brand-mark {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--white);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.brand-icon {
  width: 37px;
  height: 37px;
  display: grid;
  place-items: center;
  color: var(--navy-950);
  background: var(--teal-500);
  border-radius: 10px;
  box-shadow: 0 8px 22px rgba(20, 184, 166, 0.25);
}
.brand-icon svg {
  width: 19px;
  height: 19px;
}
.brand small {
  display: block;
  margin-top: 9px;
  color: var(--side-muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.side-nav {
  padding: 18px 14px;
}
.nav-label {
  margin: 14px 10px 8px;
  color: var(--side-muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.nav-label:first-child {
  margin-top: 0;
}
.nav-button {
  width: 100%;
  display: grid;
  grid-template-columns: 31px minmax(0, 1fr) 8px;
  gap: 10px;
  align-items: center;
  margin: 3px 0;
  padding: 9px 11px;
  color: var(--side-text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  text-decoration: none;
  transition:
    color 0.2s ease,
    background 0.2s ease,
    transform 0.2s ease;
}
.nav-button:hover {
  color: var(--white);
  background: var(--side-hover);
  transform: translateX(2px);
}
.nav-button[aria-current='page'] {
  color: var(--white);
  background: var(--side-active);
  border-color: rgba(45, 212, 191, 0.22);
}
.nav-num {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  color: #b3c5d6;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 8px;
  font-size: 0.72rem;
  font-weight: 800;
}
.nav-num svg {
  width: 16px;
  height: 16px;
}
.nav-button[aria-current='page'] .nav-num {
  color: var(--navy-950);
  background: var(--teal-500);
}
.nav-text {
  min-width: 0;
  font-size: 0.84rem;
  font-weight: 650;
  line-height: 1.3;
}
.nav-status {
  width: 7px;
  height: 7px;
  background: #3b5268;
  border-radius: 50%;
  transition: 0.25s ease;
}
.nav-status.done {
  background: var(--teal-500);
  box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.11);
}

.side-progress {
  margin: auto 16px 20px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 15px;
}
.side-progress-top {
  display: flex;
  align-items: center;
  gap: 13px;
}
.mini-ring {
  --p: 0deg;
  width: 58px;
  height: 58px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--teal-500) var(--p), rgba(255, 255, 255, 0.1) 0);
  position: relative;
}
.mini-ring::after {
  content: '';
  position: absolute;
  inset: 6px;
  background: #10283e;
  border-radius: 50%;
}
.mini-ring span {
  position: relative;
  z-index: 1;
  color: var(--white);
  font-size: 0.76rem;
  font-weight: 800;
}
.side-progress strong {
  display: block;
  color: var(--white);
  font-size: 0.88rem;
}
.side-progress p {
  margin: 2px 0 0;
  color: var(--side-muted);
  font-size: 0.74rem;
  line-height: 1.4;
}

.main-area {
  min-width: 0;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  min-height: 70px;
  padding: 12px clamp(18px, 4vw, 48px);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1 1 280px;
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.breadcrumb {
  min-width: 0;
  overflow: hidden;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}
.breadcrumb strong {
  color: var(--heading-2);
}
.top-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 170px;
}
.top-progress .label,
.top-progress output {
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 800;
}
.progress-track {
  flex: 1;
  height: 8px;
  min-width: 70px;
  overflow: hidden;
  background: var(--surface-3);
  border-radius: 999px;
}
.progress-fill {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--teal-600), #2dd4bf);
  border-radius: inherit;
  transition: width 0.55s var(--ease-out);
}
.icon-btn,
.home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 40px;
  min-height: 40px;
  padding: 7px 10px;
  color: var(--heading-2);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  transition:
    border-color 0.2s ease,
    background 0.2s ease;
}
.icon-btn:hover,
.home-link:hover {
  border-color: var(--accent-strong);
  background: var(--surface-2);
}
.icon-btn svg,
.home-link svg {
  width: 17px;
  height: 17px;
}
.part-switch {
  min-height: 40px;
  padding: 7px 30px 7px 10px;
  color: var(--heading-2);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 700;
}
.burger {
  display: none;
}
.drawer-overlay {
  display: none;
}

.page {
  width: min(1180px, calc(100% - 44px));
  margin: 0 auto;
  padding: 34px 0 70px;
}
.page:focus {
  outline: none;
}
.view {
  display: none;
}
.view.active {
  display: block;
}
/* Animate only views the user switches to; the first view paints at once (better LCP). */
.view.active.view-enter {
  animation: view-in 0.42s var(--ease-out);
}
@keyframes view-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- typography ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 13px;
  color: var(--accent-text);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: '';
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
}
h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}
h1 {
  max-width: 850px;
  margin-bottom: 16px;
  color: var(--heading);
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.05em;
}
h2 {
  margin-bottom: 11px;
  color: var(--heading);
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.04em;
}
h2:focus {
  outline: none;
}
h3,
h2.panel-title {
  color: var(--heading-2);
  font-size: 1.08rem;
  line-height: 1.3;
}
/* Panel titles are h2 for a correct heading outline (h1 → h2) but look like h3. */
h2.panel-title {
  margin-bottom: 1em;
  letter-spacing: normal;
}
.lede {
  max-width: 730px;
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: clamp(1rem, 1.4vw, 1.1rem);
}
.muted {
  color: var(--text-muted);
}
.small {
  font-size: 0.82rem;
}

/* ---------- buttons ---------- */
.primary-btn,
.secondary-btn,
.example-toggle,
.complete-btn,
.calc-btn,
.reset-btn,
.chip-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 43px;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-weight: 800;
  font-size: 0.84rem;
  cursor: pointer;
  text-decoration: none;
  transition:
    transform 0.2s ease,
    background 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}
.primary-btn,
.calc-btn {
  color: var(--on-brand);
  background: var(--brand);
  box-shadow: 0 8px 20px rgba(7, 26, 46, 0.14);
}
.primary-btn:hover,
.calc-btn:hover {
  background: var(--brand-hover);
  transform: translateY(-2px);
}
.secondary-btn,
.reset-btn {
  color: var(--heading-2);
  background: var(--surface);
  border-color: var(--border-strong);
}
.secondary-btn:hover,
.reset-btn:hover {
  border-color: var(--accent-strong);
  background: var(--surface-2);
}
.primary-btn svg,
.secondary-btn svg,
.reset-btn svg,
.calc-btn svg {
  width: 17px;
  height: 17px;
}
.btn-arrow {
  transition: transform 0.2s ease;
}
.primary-btn:hover .btn-arrow {
  transform: translateX(3px);
}
.danger-btn {
  color: var(--unfav);
  border-color: var(--unfav-border);
}
.danger-btn:hover {
  background: var(--unfav-bg);
  border-color: var(--unfav);
}
.chip-btn {
  min-height: 34px;
  padding: 6px 12px;
  color: var(--text-2);
  background: var(--surface);
  border-color: var(--border-strong);
  border-radius: 999px;
  font-size: 0.78rem;
}
.chip-btn[aria-pressed='true'] {
  color: var(--on-accent);
  background: var(--accent);
  border-color: var(--accent);
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none !important;
}

/* ---------- overview ---------- */
.overview-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(32px, 7vw, 90px);
  align-items: center;
  padding: 26px 0 44px;
  border-bottom: 1px solid var(--border-strong);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 26px;
}
.weight-visual {
  display: grid;
  justify-items: center;
}
.weight-ring {
  --p: 72deg;
  width: 200px;
  height: 200px;
  display: grid;
  place-items: center;
  position: relative;
  border-radius: 50%;
  background: conic-gradient(var(--accent) 0 var(--p), var(--surface-3) var(--p) 360deg);
  box-shadow: var(--shadow);
  animation: ring-enter 0.9s var(--ease-out) both;
}
@keyframes ring-enter {
  from {
    opacity: 0;
    transform: rotate(-30deg) scale(0.82);
  }
  to {
    opacity: 1;
    transform: rotate(0) scale(1);
  }
}
.weight-ring::after {
  content: '';
  position: absolute;
  inset: 18px;
  background: var(--surface);
  border-radius: 50%;
}
.weight-copy {
  position: relative;
  z-index: 1;
  text-align: center;
}
.weight-copy strong {
  display: block;
  color: var(--heading);
  font-size: 3rem;
  line-height: 1;
  letter-spacing: -0.06em;
}
.weight-copy span {
  color: var(--text-muted);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.weight-note {
  max-width: 245px;
  margin: 16px 0 0;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(270px, 0.6fr);
  gap: 22px;
  margin-top: 28px;
}
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.panel-pad {
  padding: 22px 24px;
}
.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 24px 16px;
}
.panel-header h3 {
  margin-bottom: 4px;
}
.panel-header p {
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: 0.84rem;
}
.task-count {
  color: var(--accent-text);
  font-size: 0.8rem;
  font-weight: 850;
  white-space: nowrap;
}
.learning-path {
  padding: 0 12px 12px;
}
.path-row {
  width: 100%;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 13px;
  align-items: center;
  padding: 13px 12px;
  color: inherit;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--surface-3);
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  text-decoration: none;
  transition:
    background 0.2s ease,
    transform 0.2s ease;
}
.path-row:hover {
  background: var(--accent-soft);
  transform: translateX(3px);
}
.path-num {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: var(--heading-2);
  background: var(--surface-3);
  border-radius: 10px;
  font-size: 0.74rem;
  font-weight: 850;
}
.path-row.completed .path-num {
  color: var(--fav);
  background: var(--fav-bg);
}
.path-title {
  display: block;
  color: var(--heading-2);
  font-size: 0.9rem;
  font-weight: 800;
}
.path-meta {
  color: var(--text-muted);
  font-size: 0.78rem;
}
.path-state {
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 800;
}
.path-row.completed .path-state {
  color: var(--fav);
}

.exam-lens {
  padding: 24px;
  color: var(--white);
  background: linear-gradient(150deg, var(--navy-900), var(--navy-800));
  border-color: transparent;
}
.exam-lens h3,
.exam-lens h2.panel-title {
  color: var(--white);
}
.exam-lens > p {
  color: #c3d3e2;
  font-size: 0.86rem;
}
.lens-list {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}
.lens-item {
  display: grid;
  grid-template-columns: 27px 1fr;
  gap: 10px;
  align-items: start;
}
.lens-item > span {
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  color: var(--navy-950);
  background: var(--teal-500);
  border-radius: 7px;
  font-size: 0.7rem;
  font-weight: 900;
}
.lens-item p {
  margin: 1px 0 0;
  color: #dbe5ee;
  font-size: 0.82rem;
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 22px;
}
.stat {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.stat strong {
  display: block;
  color: var(--heading);
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
}
.stat span {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

/* ---------- topic views ---------- */
.topic-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  margin-bottom: 26px;
  padding-bottom: 25px;
  border-bottom: 1px solid var(--border-strong);
}
.topic-index {
  min-width: 110px;
  color: var(--decor);
  font-size: clamp(3.6rem, 8vw, 6.4rem);
  font-weight: 850;
  line-height: 0.8;
  letter-spacing: -0.08em;
  text-align: right;
}
.topic-heading .lede {
  max-width: 770px;
  font-size: 0.98rem;
}

.lesson {
  margin-bottom: 14px;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.lesson > summary {
  list-style: none;
  display: grid;
  grid-template-columns: 39px minmax(0, 1fr) 28px;
  gap: 13px;
  align-items: center;
  padding: 17px 19px;
  cursor: pointer;
  user-select: none;
}
.lesson > summary::-webkit-details-marker {
  display: none;
}
.lesson > summary:hover {
  background: var(--surface-2);
}
.lesson-icon {
  width: 37px;
  height: 37px;
  display: grid;
  place-items: center;
  color: var(--accent-text);
  background: var(--accent-soft);
  border-radius: 10px;
}
.lesson-icon svg {
  width: 18px;
  height: 18px;
}
.lesson-title {
  color: var(--heading-2);
  font-size: 0.96rem;
  font-weight: 850;
}
.lesson-sub {
  display: block;
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
}
.lesson-chevron {
  color: var(--text-muted);
  font-size: 1.2rem;
  transition: transform 0.25s ease;
}
.lesson[open] .lesson-chevron {
  transform: rotate(45deg);
}
.lesson-body {
  padding: 4px 22px 24px 74px;
  border-top: 1px solid var(--surface-3);
}
.lesson[open] .lesson-body {
  animation: lesson-open 0.25s ease both;
}
@keyframes lesson-open {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.lesson-body > p,
.lesson-body li {
  color: var(--text-2);
  font-size: 0.92rem;
}
.lesson-body h4 {
  margin: 22px 0 9px;
  color: var(--heading-2);
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.study-list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.study-list li {
  position: relative;
  margin: 8px 0;
  padding-left: 20px;
  color: var(--text-2);
  font-size: 0.9rem;
}
.study-list li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}
.study-list strong {
  color: var(--heading-2);
}
abbr[data-term] {
  text-decoration: underline dotted var(--accent-strong);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  cursor: help;
  border-radius: 3px;
}

/* formula */
.formula-box {
  position: relative;
  margin: 15px 0;
  padding: 17px 19px 17px 23px;
  overflow: hidden;
  color: var(--code-text);
  background: var(--code-bg);
  border-radius: 12px;
}
.formula-box::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--teal-500);
}
.formula-label {
  margin-bottom: 6px;
  color: var(--code-label);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.formula {
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 1.2vw, 0.92rem);
  line-height: 1.9;
  overflow-x: auto;
  overflow-y: hidden;
}
.formula .katex {
  color: var(--code-strong);
  font-size: 1.12em;
}
.formula .katex-display {
  margin: 0.3em 0;
  text-align: left;
}
.formula .katex-display > .katex {
  text-align: left;
}
.formula strong {
  color: var(--code-strong);
}
.formula-note {
  margin: 9px 0 0;
  color: var(--code-note);
  font-size: 0.76rem;
}
.formula-note .katex {
  color: var(--code-text);
}
.formula-vars {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 12px;
  margin: 10px 0 0;
  color: var(--code-note);
  font-size: 0.76rem;
}
.formula-vars dt {
  color: var(--code-text);
  font-family: var(--font-mono);
}
.formula-vars dd {
  margin: 0;
}
.convention-flag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 7px;
  color: var(--navy-950);
  background: #fbbf24;
  border-radius: 999px;
  font-size: 0.62rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  vertical-align: 1px;
}
.formula-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

/* worked example */
.example-toggle {
  min-height: 38px;
  margin-top: 2px;
  padding: 8px 13px;
  color: var(--accent-text);
  background: var(--accent-soft);
  border-color: var(--accent-border);
  box-shadow: none;
}
.example-toggle:hover {
  color: var(--heading-2);
  background: var(--accent-soft-2);
  transform: translateY(-1px);
}
.example-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.25s ease;
}
.example-toggle[aria-expanded='true'] svg {
  transform: rotate(180deg);
}
.worked-example {
  margin: 13px 0 4px;
  padding: 18px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.worked-example h4 {
  margin: 0 0 8px;
  color: var(--heading-2);
  font-size: 0.86rem;
  letter-spacing: 0;
  text-transform: none;
}
.scenario {
  margin-bottom: 13px;
  color: var(--text-2);
  font-size: 0.88rem;
}
.solution-steps {
  display: grid;
  gap: 9px;
  counter-reset: steps;
}
.solution-steps[hidden] {
  display: none;
}
.solution-step {
  position: relative;
  padding-left: 31px;
  color: var(--text-2);
  font-size: 0.86rem;
}
.solution-step::before {
  counter-increment: steps;
  content: counter(steps);
  position: absolute;
  left: 0;
  top: 0;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--navy-800);
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 850;
}
.answer-line {
  margin-top: 13px;
  padding: 10px 12px;
  color: var(--fav);
  background: var(--fav-bg);
  border-left: 3px solid var(--fav-solid);
  border-radius: 7px;
  font-size: 0.86rem;
  font-weight: 700;
}

/* callouts */
.exam-trap,
.instructor-note {
  margin: 16px 0;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 0.86rem;
}
.exam-trap {
  color: var(--trap-text);
  background: var(--trap-bg);
  border: 1px solid var(--trap-border);
}
.instructor-note {
  color: var(--note-text);
  background: var(--note-bg);
  border: 1px solid var(--note-border);
}
.exam-trap > strong:first-child,
.instructor-note > strong:first-child {
  display: block;
  margin-bottom: 3px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* tables */
.data-table-wrap {
  margin: 15px 0;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 11px;
}
.data-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  background: var(--surface);
  font-size: 0.84rem;
}
.data-table th {
  padding: 11px 13px;
  color: var(--white);
  background: var(--navy-900);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-align: left;
  text-transform: uppercase;
}
.data-table td {
  padding: 11px 13px;
  color: var(--text-2);
  border-top: 1px solid var(--border);
  vertical-align: top;
}
.data-table tr:nth-child(even) td {
  background: var(--surface-2);
}
.data-table td:first-child {
  color: var(--heading-2);
  font-weight: 800;
}
.data-table .num {
  text-align: right;
  white-space: nowrap;
}

/* completion */
.topic-complete {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 24px;
  padding: 20px 22px;
  color: var(--white);
  background: var(--brand-gradient);
  border-radius: var(--radius-md);
}
.topic-complete h3 {
  margin: 0 0 3px;
  color: var(--white);
  font-size: 0.98rem;
}
.topic-complete p {
  margin: 0;
  color: #c3d3e2;
  font-size: 0.8rem;
}
.complete-btn {
  min-width: 168px;
  color: var(--navy-950);
  background: var(--teal-500);
}
.complete-btn:hover {
  background: #2dd4bf;
  transform: translateY(-1px);
}
.complete-btn[aria-pressed='true'] {
  color: var(--white);
  background: var(--green-700);
}

.placeholder {
  padding: 26px;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  text-align: center;
}
.placeholder strong {
  display: block;
  margin-bottom: 4px;
  color: var(--heading-2);
}

/* ---------- calculators ---------- */
.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(340px, 1.05fr);
  gap: 22px;
  align-items: start;
  margin-bottom: 28px;
}
.tool-panel {
  padding: clamp(20px, 4vw, 30px);
}
.tool-panel > p {
  color: var(--text-muted);
  font-size: 0.86rem;
}
.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.field label {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
  color: var(--heading-2);
  font-size: 0.78rem;
  font-weight: 800;
}
.field label span {
  color: var(--text-muted);
  font-weight: 600;
}
.field input,
.field select,
.field textarea,
.text-input {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}
.field textarea,
.text-input {
  font-family: var(--font-sans);
}
.field input:focus,
.field select:focus,
.field textarea:focus,
.text-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.18);
}
.field input[aria-invalid='true'] {
  border-color: var(--unfav);
}
.field-error {
  min-height: 19px;
  margin: 9px 0 0;
  color: var(--unfav);
  font-size: 0.8rem;
}
.calc-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}
.calc-btn {
  flex: 1;
}
.results-panel {
  min-height: 100%;
  padding: clamp(20px, 4vw, 30px);
  color: var(--white);
  background: var(--code-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.results-panel h3 {
  color: var(--white);
}
.results-panel > p {
  color: #a9bccd;
  font-size: 0.84rem;
}
.empty-result {
  min-height: 200px;
  display: grid;
  place-items: center;
  color: #93a9bd;
  border: 1px dashed #33506a;
  border-radius: 12px;
  text-align: center;
  font-size: 0.84rem;
}
.result-list {
  display: grid;
  gap: 10px;
  animation: result-in 0.35s var(--ease-out);
}
@keyframes result-in {
  from {
    opacity: 0;
    transform: scale(0.97);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
.result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 14px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 10px;
}
.result-row span {
  color: #b5c6d6;
  font-size: 0.78rem;
}
.result-row strong {
  display: block;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
}
.variance-badge {
  min-width: 88px;
  padding: 5px 9px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 900;
  text-align: center;
  text-transform: uppercase;
}
.variance-badge.favorable {
  color: #75e0a7;
  background: rgba(18, 183, 106, 0.15);
}
.variance-badge.unfavorable {
  color: #fda29b;
  background: rgba(240, 68, 56, 0.15);
}
.variance-badge.neutral {
  color: var(--slate-300);
  background: rgba(255, 255, 255, 0.08);
}
.calc-steps {
  margin: 6px 0 0;
  padding: 12px 0 0 20px;
  color: #c5d4e2;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-size: 0.8rem;
}
.calc-steps li {
  margin: 4px 0;
}
.calc-proof {
  margin: 4px 0 0;
  padding-top: 12px;
  color: #9fb5c9;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}
.calc-verdict {
  margin-top: 6px;
  padding: 12px 14px;
  color: var(--navy-950);
  background: var(--teal-300);
  border-radius: 10px;
  font-weight: 800;
  font-size: 0.86rem;
}
.chart-frame {
  position: relative;
  height: 320px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.chart-frame canvas {
  width: 100% !important;
}
.chart-frame.tall {
  height: 480px;
}
.diagram-frame {
  padding: 18px;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.diagram-frame svg {
  max-width: 100%;
  height: auto;
}

/* ---------- quiz ---------- */
.quiz-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 20px;
  margin: 18px 0 14px;
}
.quiz-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.quiz-filters select {
  min-height: 38px;
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  font-size: 0.82rem;
}
.score-line {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 800;
}
.score-pill {
  padding: 5px 10px;
  color: var(--accent-text);
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  font-family: var(--font-mono);
}
.timer-pill {
  color: var(--trap-text);
  background: var(--trap-bg);
  border-color: var(--trap-border);
}
.question {
  margin-bottom: 15px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.question-top {
  display: grid;
  grid-template-columns: 35px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}
.question-num {
  width: 33px;
  height: 33px;
  display: grid;
  place-items: center;
  color: var(--on-brand);
  background: var(--brand);
  border-radius: 9px;
  font-size: 0.72rem;
  font-weight: 900;
}
.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}
.tag {
  padding: 2px 8px;
  color: var(--text-muted);
  background: var(--surface-3);
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.tag.hard {
  color: var(--unfav);
  background: var(--unfav-bg);
}
.tag.medium {
  color: var(--trap-text);
  background: var(--trap-bg);
}
.tag.easy {
  color: var(--fav);
  background: var(--fav-bg);
}
.question-stem {
  margin: 3px 0 16px;
  color: var(--heading-2);
  font-size: 0.98rem;
  font-weight: 650;
  line-height: 1.6;
}
.options {
  display: grid;
  gap: 9px;
  margin: 0 0 0 47px;
  padding: 0;
  border: 0;
}
.option-btn {
  width: 100%;
  display: grid;
  grid-template-columns: 29px minmax(0, 1fr);
  gap: 11px;
  align-items: center;
  padding: 11px 13px;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  transition:
    border-color 0.18s ease,
    background 0.18s ease,
    transform 0.18s ease;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateX(2px);
}
.option-btn:disabled {
  cursor: default;
  opacity: 1;
}
.option-btn[aria-pressed='true'] {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.option-letter {
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  color: var(--heading-2);
  background: var(--surface-3);
  border-radius: 7px;
  font-size: 0.72rem;
  font-weight: 900;
}
.option-btn.correct {
  color: var(--fav);
  background: var(--fav-bg);
  border-color: var(--fav-border);
}
.option-btn.correct .option-letter {
  color: var(--white);
  background: var(--fav-solid);
}
.option-btn.incorrect {
  color: var(--unfav);
  background: var(--unfav-bg);
  border-color: var(--unfav-border);
}
.option-btn.incorrect .option-letter {
  color: var(--white);
  background: var(--unfav-solid);
}
.feedback {
  margin: 14px 0 0 47px;
  padding: 13px 15px;
  border-radius: 9px;
  font-size: 0.86rem;
}
.feedback:empty {
  display: none;
}
.feedback.correct {
  color: var(--text);
  background: var(--fav-bg);
  border-left: 4px solid var(--fav-solid);
}
.feedback.incorrect {
  color: var(--text);
  background: var(--unfav-bg);
  border-left: 4px solid var(--unfav-solid);
}
.feedback .verdict {
  display: block;
  margin-bottom: 4px;
  font-weight: 850;
}
.feedback.correct .verdict {
  color: var(--fav);
}
.feedback.incorrect .verdict {
  color: var(--unfav);
}
.feedback ul {
  margin: 8px 0 0;
  padding-left: 18px;
}
.feedback li {
  margin: 4px 0;
}
.quiz-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
  padding: 24px;
  color: var(--white);
  background: var(--brand-gradient);
  border-radius: var(--radius-md);
}
.quiz-summary strong {
  display: block;
  font-size: 1.45rem;
}
.quiz-summary p {
  margin: 3px 0 0;
  color: #c3d3e2;
  font-size: 0.84rem;
}
.kbd-hint {
  color: var(--text-muted);
  font-size: 0.76rem;
}
kbd {
  padding: 1px 6px;
  color: var(--heading-2);
  background: var(--surface-3);
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

/* ---------- flashcards ---------- */
.fc-stage {
  display: grid;
  justify-items: center;
  gap: 16px;
  margin-top: 18px;
}
.flashcard {
  width: min(640px, 100%);
  min-height: 280px;
  perspective: 1400px;
  cursor: pointer;
  background: none;
  border: 0;
  padding: 0;
  text-align: left;
}
.flashcard-inner {
  position: relative;
  display: grid;
  width: 100%;
  min-height: 280px;
  transform-style: preserve-3d;
  transition: transform 0.55s var(--ease-out);
}
.flashcard[aria-pressed='true'] .flashcard-inner {
  transform: rotateY(180deg);
}
.flashcard-face {
  grid-area: 1 / 1;
  display: grid;
  align-content: center;
  gap: 10px;
  padding: 30px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.flashcard-face.back {
  transform: rotateY(180deg);
  background: var(--surface-2);
}
.flashcard-face .face-label {
  color: var(--accent-text);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.flashcard-face .face-text {
  color: var(--heading-2);
  font-size: 1.08rem;
  font-weight: 650;
}
.srs-buttons {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  width: min(640px, 100%);
}
.srs-btn {
  display: grid;
  gap: 2px;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 800;
}
.srs-btn small {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.72rem;
}
.srs-btn.again {
  color: var(--unfav);
}
.srs-btn.hard {
  color: var(--trap-text);
}
.srs-btn.good {
  color: var(--accent-text);
}
.srs-btn.easy {
  color: var(--fav);
}
.srs-btn:hover:not(:disabled) {
  background: var(--surface-2);
}

/* ---------- written practice ---------- */
.cbq {
  margin-bottom: 22px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.cbq-scenario {
  padding: 16px 18px;
  color: var(--text-2);
  background: var(--surface-2);
  border-radius: 12px;
  font-size: 0.9rem;
}
.cbq-part {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.cbq-part textarea {
  min-height: 130px;
  resize: vertical;
}
.cbq-model {
  margin-top: 12px;
  padding: 14px 16px;
  background: var(--note-bg);
  border: 1px solid var(--note-border);
  border-radius: 10px;
  color: var(--text);
  font-size: 0.88rem;
}
.rubric {
  width: 100%;
  margin-top: 10px;
  border-collapse: collapse;
  font-size: 0.84rem;
}
.rubric td {
  padding: 6px 8px;
  border-top: 1px solid var(--border);
  vertical-align: top;
}
.rubric td:last-child {
  text-align: right;
  white-space: nowrap;
}

/* ---------- glossary ---------- */
.glossary-list {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
}
.glossary-item {
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.glossary-item dt {
  color: var(--heading-2);
  font-weight: 800;
}
.glossary-item dd {
  margin: 4px 0 0;
  color: var(--text-2);
  font-size: 0.9rem;
}
.search-box {
  position: relative;
  max-width: 520px;
}
.search-box svg {
  position: absolute;
  left: 12px;
  top: 50%;
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transform: translateY(-50%);
}
.search-box input {
  padding-left: 40px;
}

/* ---------- drag & drop ---------- */
.drag-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.drag-item {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 11px 13px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  cursor: grab;
}
.drag-item:focus-visible {
  outline-offset: 1px;
}
.drag-item .grip {
  color: var(--text-muted);
}
.drag-item .move-btns {
  display: flex;
  gap: 4px;
}
.drag-item .move-btns button {
  min-width: 30px;
  min-height: 30px;
  padding: 2px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  cursor: pointer;
}
.sortable-ghost {
  opacity: 0.4;
}
.drag-item.correct {
  border-color: var(--fav-border);
  background: var(--fav-bg);
}
.drag-item.incorrect {
  border-color: var(--unfav-border);
  background: var(--unfav-bg);
}

/* ---------- formula sheet ---------- */
.formula-sheet {
  columns: 2 340px;
  column-gap: 18px;
}
.formula-sheet .formula-box {
  break-inside: avoid;
  margin-top: 0;
}
.formula-sheet h3 {
  column-span: all;
  margin: 18px 0 10px;
}

/* ---------- toast & notices ---------- */
.toast-region {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 300;
  display: grid;
  gap: 8px;
}
.toast {
  max-width: 340px;
  padding: 12px 16px;
  color: var(--white);
  background: var(--navy-900);
  border-radius: 10px;
  box-shadow: var(--shadow);
  font-size: 0.86rem;
  font-weight: 650;
  animation: result-in 0.3s var(--ease-out);
}
.notice {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 0 0 18px;
  padding: 14px 16px;
  color: var(--trap-text);
  background: var(--trap-bg);
  border: 1px solid var(--trap-border);
  border-radius: 12px;
  font-size: 0.86rem;
}
.notice svg {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  margin-top: 1px;
}
.notice p {
  margin: 0;
  flex: 1 1 auto;
}
.notice .reset-btn {
  flex: 0 0 auto;
  white-space: nowrap;
}
.notice.install-hint {
  color: var(--note-text);
  background: var(--note-bg);
  border-color: var(--note-border);
}

/* ---------- index (hub) ---------- */
.hub-shell {
  display: block;
}
.hub-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding: 12px clamp(16px, 4vw, 48px);
  background: var(--topbar-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
}
.hub-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--heading);
  font-weight: 850;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.hub-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  padding: 10px 0 30px;
}
.ring-group {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.ring-card {
  display: grid;
  justify-items: center;
  gap: 8px;
}
.readiness-ring {
  --p: 0deg;
  width: 132px;
  height: 132px;
}
.readiness-ring.small-ring {
  width: 96px;
  height: 96px;
}
.readiness-ring.small-ring::after {
  inset: 12px;
}
.readiness-ring.small-ring .weight-copy strong {
  font-size: 1.6rem;
}
.readiness-ring .weight-copy strong {
  font-size: 2.1rem;
}
.ring-card > span {
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.countdown {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.86rem;
}
.countdown strong {
  color: var(--heading);
  font-family: var(--font-mono);
  font-size: 1.3rem;
}
.countdown input {
  min-height: 38px;
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 9px;
}
.hub-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 22px;
}
.hub-side {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 22px;
}
.part-card {
  padding: 22px;
}
.part-card > header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.part-card h2 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}
.section-row {
  padding: 14px 0;
  border-top: 1px solid var(--border);
}
.section-head {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
}
.section-letter {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: var(--on-brand);
  background: var(--brand);
  border-radius: 10px;
  font-weight: 900;
}
.section-title {
  color: var(--heading-2);
  font-weight: 800;
  text-decoration: none;
}
.section-title:hover {
  text-decoration: underline;
}
.section-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin-top: 2px;
  color: var(--text-muted);
  font-size: 0.78rem;
}
.section-stats b {
  color: var(--text-2);
  font-family: var(--font-mono);
  font-weight: 700;
}
.section-bar {
  height: 5px;
  margin-top: 8px;
  overflow: hidden;
  background: var(--surface-3);
  border-radius: 999px;
}
.section-bar > span {
  display: block;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
}
.topic-list {
  margin-top: 6px;
}
.topic-list > summary {
  color: var(--accent-text);
  font-size: 0.8rem;
  font-weight: 750;
  cursor: pointer;
}
.topic-list ol {
  margin: 6px 0 0;
  padding-left: 22px;
}
.topic-list li {
  margin: 3px 0;
  font-size: 0.86rem;
}
.topic-list li.done::marker {
  color: var(--fav);
}
.topic-list .done-mark {
  color: var(--fav);
  font-weight: 800;
}
.mini-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.mini-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 0;
  border-top: 1px solid var(--border);
  font-size: 0.86rem;
}
.mini-list li:first-child {
  border-top: 0;
}
.search-results {
  display: grid;
  gap: 6px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.search-results a {
  display: block;
  padding: 10px 12px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
}
.search-results a:hover,
.search-results a:focus-visible {
  border-color: var(--accent);
}
.search-results .kind {
  color: var(--accent-text);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.search-results .where {
  display: block;
  color: var(--text-muted);
  font-size: 0.76rem;
}
.data-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.backup-age {
  padding: 4px 10px;
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}
.backup-age:empty {
  display: none;
}
/* Amber after 7 days without an export (or never exported while progress exists). */
.backup-age.is-stale {
  color: var(--trap-text);
  background: var(--trap-bg);
  border-color: var(--trap-border);
}

/* ---------- footer ---------- */
.page-footer {
  margin-top: 42px;
  padding-top: 18px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-strong);
  font-size: 0.76rem;
}

/* ---------- tippy theme ---------- */
.tippy-box[data-theme~='cma'] {
  max-width: 320px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  box-shadow: var(--shadow);
  font-size: 0.84rem;
  line-height: 1.5;
}
.tippy-box[data-theme~='cma'] .tippy-content {
  padding: 10px 12px;
}
.tippy-box[data-theme~='cma'] strong {
  color: var(--heading-2);
}
.tippy-box[data-theme~='cma'] > .tippy-arrow::before {
  color: var(--surface);
}

/* ---------- responsive ---------- */
@media (max-width: 1060px) {
  :root {
    --sidebar-w: 240px;
  }
  .overview-hero {
    grid-template-columns: minmax(0, 1fr) 230px;
    gap: 35px;
  }
  .weight-ring {
    width: 180px;
    height: 180px;
  }
  .dashboard-grid,
  .tool-layout,
  .hub-grid {
    grid-template-columns: 1fr;
  }
  .hub-side {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 899px) {
  .app-shell {
    display: block;
  }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 120;
    width: min(86vw, 300px);
    transform: translateX(-100%);
    transition: transform 0.3s var(--ease-out);
    visibility: hidden;
  }
  .sidebar.open {
    transform: translateX(0);
    visibility: visible;
  }
  .drawer-overlay.open {
    position: fixed;
    inset: 0;
    z-index: 110;
    display: block;
    background: var(--overlay);
  }
  .burger {
    display: inline-flex;
  }
  .breadcrumb {
    font-size: 0.72rem;
  }
  .page {
    width: min(100% - 32px, 760px);
    padding-top: 24px;
  }
  .overview-hero {
    grid-template-columns: 1fr;
  }
  .weight-visual {
    justify-items: start;
  }
  .weight-note {
    text-align: left;
  }
  .topic-index {
    display: none;
  }
  .topic-heading {
    grid-template-columns: 1fr;
  }
  .lesson-body {
    padding-left: 20px;
  }
  .formula-grid {
    grid-template-columns: 1fr;
  }
  .hub-hero {
    grid-template-columns: 1fr;
  }
  .hub-side {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 560px) {
  h1 {
    font-size: 2.1rem;
  }
  .topbar {
    padding: 10px 16px;
  }
  .top-progress {
    display: none;
  }
  .hero-actions {
    display: grid;
  }
  .hero-actions > * {
    width: 100%;
  }
  .panel-header {
    padding: 19px 18px 13px;
  }
  .path-row {
    grid-template-columns: 38px minmax(0, 1fr);
  }
  .path-state {
    display: none;
  }
  .lesson > summary {
    grid-template-columns: 35px minmax(0, 1fr) 20px;
    padding: 14px;
  }
  .lesson-body {
    padding: 3px 15px 20px;
  }
  .formula-box {
    padding: 15px 13px 15px 17px;
  }
  .topic-complete {
    display: block;
  }
  .complete-btn {
    width: 100%;
    margin-top: 14px;
  }
  .input-grid {
    grid-template-columns: 1fr;
  }
  .calc-actions {
    display: grid;
  }
  .question {
    padding: 17px 14px;
  }
  .options,
  .feedback {
    margin-left: 0;
  }
  .srs-buttons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .section-head {
    grid-template-columns: 34px minmax(0, 1fr);
  }
  .section-head > :last-child {
    grid-column: 1 / -1;
    justify-self: start;
  }
}
@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;
  }
}

/* ---------- refinements after visual review ---------- */
.field .text-input,
.field textarea {
  font-family: var(--font-sans);
}
.countdown strong {
  font-family: var(--font-sans);
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
}
.tag {
  white-space: nowrap;
}
@media (max-width: 899px) {
  .part-switch {
    display: none;
  }
  .topbar {
    flex-wrap: nowrap;
    gap: 8px;
  }
  .topbar-left {
    flex: 1 1 0;
  }
  .topbar-right {
    flex-wrap: nowrap;
    gap: 6px;
  }
}
@media (max-width: 560px) {
  .home-link {
    padding: 7px 9px;
  }
  .breadcrumb {
    display: none;
  }
}

/* Inline math in prose matches the surrounding text size (KaTeX defaults to 1.21em). */
.solution-step .katex,
.scenario .katex,
.answer-line .katex,
.lesson-body p .katex,
.lesson-body li .katex,
.feedback .katex,
.question-stem .katex,
.option-btn .katex,
.flashcard-face .katex,
.cbq .katex,
.formula-note .katex,
.exam-trap .katex,
.instructor-note .katex {
  font-size: 1em;
}

/* ---------- overview quick-jump cards ---------- */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
  margin-top: 22px;
}
.quick-card {
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  transition:
    border-color 0.2s ease,
    transform 0.2s ease;
}
.quick-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.quick-card strong {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--heading-2);
}
.quick-card span {
  color: var(--text-muted);
  font-size: 0.82rem;
}
.conventions {
  margin-top: 22px;
}
.conventions h3 {
  margin-bottom: 10px;
}
.mode-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}
.tool-block + .tool-block {
  margin-top: 28px;
}
.tool-block > h3 {
  margin-bottom: 4px;
}
.tool-block > p {
  color: var(--text-muted);
  font-size: 0.86rem;
}
.input-grid .field-span {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  color: var(--heading-2);
  font-size: 0.74rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Tables inside the dark results panel (schedules, comparisons). */
.result-table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
}
.result-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
.result-table th,
.result-table td {
  padding: 8px 10px;
  color: #dbe5ee;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: right;
  white-space: nowrap;
}
.result-table th {
  color: #9fb5c9;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-top: 0;
}
.result-table th:first-child,
.result-table td:first-child {
  text-align: left;
}
.result-table td {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.input-grid .field-wide {
  grid-column: 1 / -1;
}
.result-table th,
.result-table td {
  padding: 7px 8px;
}
.result-table {
  font-size: 0.76rem;
}

/* ---------- P1E: COSO matching game & segregation-of-duties checker ---------- */
.coso-game {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 16px;
  margin-bottom: 14px;
}
.coso-buckets {
  display: grid;
  gap: 12px;
}
.coso-pool,
.coso-bucket {
  padding: 14px;
}
.coso-pool h4,
.coso-bucket h4 {
  margin: 0 0 10px;
  font-size: 0.9rem;
}
.coso-list {
  min-height: 52px;
  padding: 6px;
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
}
.coso-card {
  grid-template-columns: 22px minmax(0, 1fr);
  font-size: 0.86rem;
}
.coso-card select {
  grid-column: 2;
  max-width: 100%;
  font-size: 0.8rem;
}
.coso-why {
  grid-column: 2;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.coso-status {
  margin-top: 10px;
  font-weight: 700;
}
.sod-table th[scope='row'] {
  font-weight: 600;
  letter-spacing: normal;
  text-transform: none;
  text-align: left;
}
.sod-table td {
  text-align: center;
}
.sod-table input[type='radio'] {
  width: 18px;
  height: 18px;
}
.sod-fn {
  display: block;
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-muted);
}
.sod-summary.unfavorable {
  color: var(--white);
  background: #b42318;
}
.sod-conflict {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.86rem;
}
.sod-conflict h5 {
  margin: 0 0 6px;
  color: var(--teal-300);
  font-size: 0.9rem;
}
.sod-conflict p {
  margin: 4px 0;
  color: #d5e1ec;
}
#sod-tool {
  grid-template-columns: minmax(0, 1fr);
}
@media (max-width: 900px) {
  .coso-game {
    grid-template-columns: 1fr;
  }
}

/* ---------- P1F: analytics classifier & SDLC ordering ---------- */
.cls-panel,
.sdlc-panel {
  padding: clamp(16px, 3vw, 24px);
}
.cls-progress {
  margin: 0 0 6px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
}
.cls-scenario {
  min-height: 3em;
  margin: 0 0 14px;
  font-size: 1.02rem;
  font-weight: 600;
}
.cls-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 10px;
}
.cls-option {
  display: grid;
  gap: 2px;
  justify-items: start;
  text-align: left;
}
.cls-option span {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
}
.cls-option.correct {
  border-color: var(--fav-border);
  background: var(--fav-bg);
}
.cls-option.incorrect {
  border-color: var(--unfav-border);
  background: var(--unfav-bg);
}
.cls-option:disabled {
  cursor: default;
}
.cls-feedback {
  min-height: 1.5em;
  margin: 12px 0 0;
  font-size: 0.9rem;
}
.cls-feedback.favorable {
  color: var(--fav);
}
.cls-feedback.unfavorable {
  color: var(--unfav);
}

/* ---------- P2C: relevant-cost tables ---------- */
.rel-why {
  display: block;
  margin-top: 2px;
  font-family: var(--font-sans, inherit);
  font-size: 0.74rem;
  opacity: 0.75;
  white-space: normal;
}

/* ---------- interest tables (P2B, P2E formula sheets) ---------- */
.tvm-tables {
  margin-top: 28px;
}
.tvm-head h3 {
  margin: 0 0 6px;
}
.tvm-head p {
  max-width: 760px;
  color: var(--text-muted);
}
.tvm-head .mode-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 16px;
}
.tvm-head .mode-switch [aria-pressed='true'] {
  border-color: var(--teal-500, currentColor);
  box-shadow: inset 0 0 0 1px var(--teal-500, currentColor);
}
.tvm-table {
  margin: 0 0 22px;
}
.tvm-table figcaption {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  margin-bottom: 8px;
}
.tvm-table figcaption span {
  color: var(--text-muted);
  font-size: 0.8rem;
}
.tvm-grid {
  font-family: var(--font-mono, monospace);
  font-variant-numeric: tabular-nums;
  font-size: 0.74rem;
}
.tvm-grid th,
.tvm-grid td {
  padding: 4px 6px;
  text-align: right;
  white-space: nowrap;
}
.tvm-grid tbody th {
  position: sticky;
  left: 0;
  color: var(--white);
  background: var(--navy-900);
  text-align: center;
}
.tvm-hidden {
  display: none;
}

/* ---------- P2A: data panel above ratio lessons ---------- */
.data-note {
  margin-bottom: 16px;
  padding: 14px 18px;
  font-size: 0.88rem;
}
.data-note p {
  margin: 0;
}

/* Long labels wrap; figures stay on one line. */
.result-table td:first-child {
  white-space: normal;
}

/* ---------- P2F: ethics scenario simulator ---------- */
.eth-panel {
  padding: clamp(16px, 3vw, 24px);
}
.eth-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}
.eth-head label {
  font-weight: 700;
}
.eth-head select {
  flex: 1 1 220px;
}
.eth-progress {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
}
.eth-story {
  font-size: 1rem;
}
.eth-choices {
  display: grid;
  gap: 10px;
  margin: 12px 0;
}
.eth-choice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  text-align: left;
  white-space: normal;
}
.eth-key {
  flex: none;
  min-width: 1.6em;
  font-weight: 800;
}
.eth-feedback {
  min-height: 1.5em;
  font-size: 0.9rem;
}
.eth-feedback.favorable {
  color: var(--fav);
}
.eth-feedback.unfavorable {
  color: var(--unfav);
}
.eth-score {
  font-weight: 800;
}
.eth-log {
  margin: 12px 0 0;
  padding-left: 1.2em;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.eth-tag {
  display: inline-block;
  margin-left: 6px;
  font-weight: 700;
}

/* Choice buttons read as text: left-aligned, normal weight for the body. */
.eth-choice,
.cls-option {
  justify-content: flex-start;
  justify-items: start;
  text-align: left;
}
.eth-choice {
  font-weight: 500;
}

/* ---------- P2D: risk heat map ---------- */
.heat-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 22px;
  align-items: start;
  margin-bottom: 18px;
}
.heat-panel {
  padding: clamp(14px, 3vw, 22px);
}
.heat-grid {
  width: 100%;
  border-collapse: separate;
  border-spacing: 4px;
  table-layout: fixed;
}
.heat-grid caption {
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: left;
}
.heat-grid th {
  width: 2em;
  color: var(--text-muted);
  font-size: 0.78rem;
}
.heat-cell {
  height: 54px;
  padding: 4px;
  border-radius: 8px;
  vertical-align: middle;
  text-align: center;
}
.heat-low {
  background: rgba(18, 183, 106, 0.22);
}
.heat-medium {
  background: rgba(247, 144, 9, 0.28);
}
.heat-high {
  background: rgba(240, 68, 56, 0.32);
}
.heat-dot {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  margin: 1px;
  color: var(--white);
  background: var(--navy-900);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 800;
}
.heat-summary {
  margin: 12px 0 0;
  font-size: 0.88rem;
}
.heat-warning {
  display: block;
  margin-top: 6px;
  color: var(--unfav);
  font-weight: 700;
}
.heat-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
}
.heat-list .heat-flag td {
  background: var(--unfav-bg);
}
@media (max-width: 900px) {
  .heat-layout {
    grid-template-columns: 1fr;
  }
}

/* Keep visually hidden (.sr-only) labels inside scrollable tables from widening the page. */
.data-table-wrap,
.result-table-wrap {
  position: relative;
}

/* Hub rings on phones: keep all three on one row. */
@media (max-width: 600px) {
  .ring-group {
    flex-wrap: nowrap;
    justify-content: space-between;
    gap: 10px;
  }
  .readiness-ring {
    width: 104px;
    height: 104px;
  }
  .readiness-ring.small-ring {
    width: 84px;
    height: 84px;
  }
  .readiness-ring .weight-copy strong {
    font-size: 1.6rem;
  }
  .readiness-ring.small-ring .weight-copy strong {
    font-size: 1.3rem;
  }
  .readiness-ring .weight-copy span {
    font-size: 0.6rem;
  }
}

/* Hub header stays on one row on phones, even when the Install button appears (no layout shift). */
.hub-header {
  flex-wrap: nowrap;
}
.hub-header .topbar-right {
  flex-wrap: nowrap;
}
.hub-brand {
  min-width: 0;
  white-space: nowrap;
}
@media (max-width: 480px) {
  .hide-narrow {
    display: none;
  }
  .hub-header .topbar-right {
    gap: 6px;
  }
}
.hub-header .topbar-right > .secondary-btn {
  min-height: 0;
  height: 40px;
  padding-block: 0;
}
@media (max-width: 350px) {
  .hub-brand .brand-text {
    display: none;
  }
}

/* ---------- mock exam (mock.html) ---------- */
/* The exam bar (timer, count, submit) is what stays on screen, so the site header scrolls away here. */
body[data-page='mock'] .hub-header {
  position: static;
}
.mock-hero {
  margin-bottom: 22px;
}
.mock-big {
  color: var(--accent-text);
  font-variant-numeric: tabular-nums;
}
.notice.note {
  color: var(--note-text);
  background: var(--note-bg);
  border-color: var(--note-border);
}
.notice .primary-btn,
.notice .secondary-btn {
  flex: 0 0 auto;
}
.mock-parts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 22px;
}
.mock-part h2 {
  margin-bottom: 4px;
  font-size: 1.45rem;
}
.mock-part.is-chosen {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus);
}
.mock-mix {
  margin: 14px 0;
  padding: 0;
  list-style: none;
  font-size: 0.88rem;
}
.mock-mix li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.mock-mix b {
  font-family: var(--font-mono);
}
.mock-bar {
  position: sticky;
  top: 0;
  z-index: 25;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: -14px 0 18px;
  padding: 10px 14px;
  background: var(--topbar-bg);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px);
}
.mock-bar-title {
  color: var(--heading);
}
.mock-timer {
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}
.mock-timer.is-low {
  color: var(--unfav);
  background: var(--unfav-bg);
  border-color: var(--unfav-border);
}
.mock-count {
  color: var(--text-muted);
  font-size: 0.86rem;
}
.mock-bar [data-submit] {
  margin-left: auto;
}
.mock-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 104px;
  gap: 22px;
  align-items: start;
}
.mock-actions,
.mock-actions-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.mock-actions {
  justify-content: space-between;
}
.mock-actions-row {
  margin: 4px 0 14px;
}
.mock-flag-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--trap-text);
  background: var(--trap-bg);
}
.mock-flag-tag svg,
.question-meta .tag svg {
  width: 13px;
  height: 13px;
}
[data-flag][aria-pressed='true'] {
  color: var(--trap-text);
  background: var(--trap-bg);
  border-color: var(--trap-border);
}
.mock-grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 4px;
  margin: 10px 0 12px;
}
.mock-cell {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  height: 26px;
  padding: 0;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  cursor: pointer;
}
.mock-cell.is-answered {
  color: var(--accent-text);
  background: var(--accent-soft);
  border-color: var(--accent-border);
}
.mock-cell.is-correct {
  color: var(--fav);
  background: var(--fav-bg);
  border-color: var(--fav-border);
}
.mock-cell.is-wrong {
  color: var(--unfav);
  background: var(--unfav-bg);
  border-color: var(--unfav-border);
}
/* Flag marker: a corner triangle, so the cell's answered/correct color stays readable. */
.mock-cell.is-flagged::after {
  content: '';
  position: absolute;
  top: -1px;
  right: -1px;
  border-top: 9px solid var(--chart-3);
  border-left: 9px solid transparent;
  border-top-right-radius: 6px;
}
.mock-cell[aria-current='true'] {
  outline: 2px solid var(--accent-strong);
  outline-offset: 1px;
}
.mock-nav-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.mock-nav-actions .chip-btn {
  min-height: 36px;
  padding: 6px 10px;
  font-size: 0.78rem;
}
.mock-nav-toggle {
  display: none;
}
.mock-results-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 22px;
  margin-bottom: 22px;
}
.mock-review-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.mock-review-head h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}
.mock-answer {
  margin: 10px 0;
  padding: 12px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
}
.mock-answer-text {
  margin-top: 6px;
  white-space: pre-wrap;
}
.mock-self input {
  max-width: 120px;
}
.cbq.panel {
  margin-bottom: 22px;
}
.cbq h2 {
  font-size: 1.25rem;
}
.mock-trends {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-bottom: 14px;
}
.mock-trend {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
}
.mock-trend b {
  font-family: var(--font-mono);
}
.sparkline polyline {
  fill: none;
  stroke: var(--accent-strong);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.sparkline circle {
  fill: var(--accent-strong);
}
.mock-dialog {
  width: min(480px, calc(100% - 32px));
  padding: 22px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}
.mock-dialog::backdrop {
  background: var(--overlay);
}
.mock-dialog h2 {
  font-size: 1.3rem;
}
.mock-dialog .calc-actions {
  justify-content: flex-end;
}
/* Hub: mock exam summary */
.mock-panel {
  margin-top: 22px;
}
.mock-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.mock-summary-part {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
}
.mock-summary-part h4 {
  margin: 0 0 6px;
}
@media (max-width: 899px) {
  .mock-layout,
  .mock-results-grid,
  .mock-parts,
  .mock-summary {
    grid-template-columns: minmax(0, 1fr);
  }
  /* On phones the question grid folds away behind the "Questions" button. */
  .mock-nav-toggle {
    display: inline-flex;
  }
  .mock-bar [data-submit] {
    margin-left: 0;
  }
}
/* Row headers (<th scope="row">) in tables read like the first data cell, not like column headers. */
.data-table tbody th {
  padding: 11px 13px;
  color: var(--heading-2);
  background: none;
  border-top: 1px solid var(--border);
  font-size: inherit;
  font-weight: 800;
  letter-spacing: normal;
  text-transform: none;
  vertical-align: top;
}
.data-table tr:nth-child(even) th[scope='row'] {
  background: var(--surface-2);
}
/* Headings receive focus after each mock view change (for screen readers); no ring for that programmatic focus. */
.mock-page h1[tabindex='-1']:focus,
.mock-page h2[tabindex='-1']:focus {
  outline: none;
}
.mini-list + h3 {
  margin-top: 18px;
}
@media (max-width: 560px) {
  /* Phones: one compact row of timer, count and buttons; the part name is in the page heading for screen readers. */
  .mock-bar {
    gap: 8px;
    padding: 8px 10px;
  }
  .mock-bar-title {
    display: none;
  }
  .mock-bar .chip-btn,
  .mock-bar .primary-btn {
    min-height: 38px;
    padding: 6px 10px;
  }
  .mock-count {
    flex: 1 1 100%;
    order: 5;
    font-size: 0.78rem;
  }
}
@media (max-width: 560px) {
  .mock-actions {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 6px;
  }
  .mock-actions > * {
    min-height: 40px;
    padding: 6px 10px;
    font-size: 0.8rem;
  }
}
/* Mock: timer mode chooser */
.mock-mode {
  margin: 0 0 22px;
  border: 1px solid var(--border);
}
.mock-mode legend {
  padding: 0 6px;
  color: var(--heading-2);
  font-weight: 800;
}
.mock-mode label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 8px 0;
  font-size: 0.9rem;
  cursor: pointer;
}
.mock-mode input {
  margin-top: 4px;
  accent-color: var(--accent-strong);
}
.mock-mode-tag {
  white-space: nowrap;
}
/* Mock: cross-out of answer options */
.option-row {
  display: flex;
  align-items: stretch;
  gap: 6px;
}
.option-row .option-btn {
  flex: 1 1 auto;
  min-width: 0;
}
.option-btn.is-struck > span:last-child {
  color: var(--text-muted);
  text-decoration: line-through;
  text-decoration-thickness: 2px;
}
.option-btn.is-struck .option-letter {
  opacity: 0.55;
}
.strike-btn {
  flex: 0 0 40px;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-weight: 800;
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  cursor: pointer;
}
.strike-btn:hover {
  border-color: var(--accent-strong);
}
.strike-btn[aria-pressed='true'] {
  color: var(--unfav);
  background: var(--unfav-bg);
  border-color: var(--unfav-border);
}
/* Mock: on-screen calculator (non-modal, stays open while answering) */
.mock-calc {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 40;
  width: 288px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}
.mock-calc:focus-visible {
  outline: 3px solid var(--focus);
}
.mock-calc-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.mock-calc-head .icon-btn {
  margin-left: auto;
  min-height: 32px;
  width: 32px;
}
.mock-calc-mem {
  padding: 1px 7px;
  color: var(--accent-text);
  background: var(--accent-soft);
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 800;
}
.mock-calc-screen {
  display: grid;
  justify-items: end;
  margin-bottom: 10px;
  padding: 8px 12px;
  background: var(--code-bg);
  border-radius: 9px;
}
.mock-calc-pending {
  min-height: 1.1em;
  color: var(--code-note);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.mock-calc-display {
  overflow: hidden;
  max-width: 100%;
  color: var(--code-strong);
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.mock-calc-keys {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}
.mock-calc-keys button {
  min-height: 40px;
  color: var(--heading-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  cursor: pointer;
}
.mock-calc-keys button:hover {
  border-color: var(--accent-strong);
}
.mock-calc-keys button.wide {
  grid-column: span 2;
}
.mock-calc-keys [data-calc='='] {
  color: var(--on-brand);
  background: var(--brand);
}
.mock-calc .small {
  margin: 8px 0 0;
  font-size: 0.72rem;
}
@media (max-width: 560px) {
  .mock-calc {
    right: 8px;
    bottom: 8px;
    left: 8px;
    width: auto;
  }
  .mock-calc .small {
    display: none;
  }
  .mock-bar [data-calc-toggle] {
    padding: 6px 10px;
  }
}
/* Private question bank (local only): source tag, tables, total rules and exhibits from the documents */
.tag.pq-tag {
  color: var(--note-text);
  background: var(--note-bg);
}
.pq-table-wrap {
  margin: 10px 0;
}
.pq-table td {
  vertical-align: top;
}
.pq-table td.num {
  text-align: right;
  white-space: nowrap;
}
.pq-hr {
  display: block;
  min-width: 3em;
  margin: 2px 0;
  border-top: 1px solid currentColor;
}
hr.pq-hr {
  border: 0;
  border-top: 1px solid var(--border-strong);
}
.pq-img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 10px 0;
  background: #fff;
  border-radius: 8px;
}
.question-stem p,
.feedback p {
  margin: 0 0 8px;
}

/* ---------- MCQs by Topic (practice.html) ---------- */
body[data-page='practice'] .hub-header {
  position: static;
}
.ps-parts {
  margin: 0 0 16px;
}
.ps-sections {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.ps-section header {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.ps-section .panel-title {
  margin-bottom: 4px;
}
.ps-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.ps-open {
  margin: 0;
  padding: 0;
  list-style: none;
}
.ps-open li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.ps-row-actions {
  display: flex;
  gap: 6px;
}
.ps-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.ps-head h1 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
}
.ps-controls,
.ps-rows,
.ps-terms {
  font-size: 0.9rem;
}
.ps-controls {
  margin-bottom: 18px;
}
.ps-control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin: 6px 0;
}
.ps-control-row select {
  margin-left: 4px;
}
.ps-check {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.ps-quick .chip-btn,
.ps-control-row .chip-btn {
  min-height: 36px;
  padding: 6px 12px;
}
.ps-only {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ps-num {
  width: 64px;
  min-height: 34px;
  padding: 4px 6px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  font-family: var(--font-mono);
  text-align: right;
}
.ps-preset-name {
  max-width: 220px;
}
.ps-group {
  margin: 14px 0 6px;
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.ps-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto 72px;
  align-items: center;
  gap: 6px 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
}
.ps-row label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  white-space: nowrap;
}
.ps-row-name {
  color: var(--heading-2);
  font-weight: 650;
}
.ps-row-meta {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: right;
}
.ps-row.is-empty {
  opacity: 0.5;
}
.ps-mix {
  display: flex;
  height: 8px;
  overflow: hidden;
  background: var(--surface-3);
  border-radius: 999px;
}
.ps-mix i.e {
  background: var(--fav-solid);
}
.ps-mix i.m {
  background: var(--chart-3);
}
.ps-mix i.h {
  background: var(--unfav-solid);
}
.ps-terms {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
  margin-bottom: 8px;
}
.ps-startbar {
  position: sticky;
  bottom: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  margin-top: 18px;
  padding: 12px 14px;
  background: var(--topbar-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.ps-over {
  color: var(--unfav);
  font-weight: 700;
}
.ps-layout {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}
.ps-flag {
  min-height: 28px;
  padding: 2px 8px;
}
.ps-flag[aria-pressed='true'] {
  color: var(--trap-text);
  background: var(--trap-bg);
  border-color: var(--trap-border);
}
.ps-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
}
.ps-tools [data-report][aria-pressed='true'] {
  color: var(--unfav);
  background: var(--unfav-bg);
  border-color: var(--unfav-border);
}
.ps-note {
  margin-top: 10px;
}
.ps-note label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.85rem;
}
.ps-note textarea {
  width: 100%;
}
.question-meta .chip-btn svg {
  width: 14px;
  height: 14px;
}
@media (max-width: 899px) {
  .ps-sections,
  .ps-layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .ps-row {
    grid-template-columns: auto minmax(0, 1fr);
  }
  .ps-row-meta {
    grid-column: 1 / -1;
    text-align: left;
  }
  .ps-mix {
    grid-column: 1 / -1;
  }
}

/* MCQs by Topic, 7d: home links, quick sessions, results, history, progress */
.ps-home-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
}
.ps-quick-review {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.option-btn.is-static {
  cursor: default;
}
.pr-chart {
  position: relative;
  width: 100%;
}
.pr-table {
  margin-top: 12px;
}
.pr-review > h2 {
  margin: 24px 0 12px;
}
.pr-item {
  margin-bottom: 16px;
}
.question-meta .tag svg {
  width: 12px;
  height: 12px;
  margin-right: 3px;
  vertical-align: -1px;
}
.ph-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ph-topics {
  min-width: 180px;
}
.th-sort {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.th-sort::after {
  content: '';
  margin-left: 4px;
}
th[aria-sort='ascending'] .th-sort::after {
  content: '▲';
  font-size: 0.7em;
}
th[aria-sort='descending'] .th-sort::after {
  content: '▼';
  font-size: 0.7em;
}
.quiz-topic-link {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
}
@media (max-width: 699px) {
  /* session history as cards on phones */
  .ph-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }
  .ph-table,
  .ph-table tbody,
  .ph-table tr,
  .ph-table td {
    display: block;
    width: 100%;
  }
  .ph-table tr {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
  }
  .ph-table td {
    display: flex;
    gap: 10px;
    justify-content: space-between;
    padding: 3px 0;
    border: 0;
    text-align: right;
  }
  .ph-table td::before {
    content: attr(data-label);
    flex: none;
    font-weight: 700;
    text-align: left;
  }
  .ph-table td.ph-topics {
    display: block;
    text-align: left;
  }
  .ph-table td.ph-topics::before,
  .ph-table td.ph-actions::before {
    display: none;
  }
  .ph-table td.ph-actions {
    justify-content: flex-start;
    padding-top: 8px;
  }
}
#pp-section {
  max-width: 100%;
}
@media (max-width: 699px) {
  .ph-table,
  .pp-table {
    min-width: 0;
  }
  .pp-table th,
  .pp-table td {
    padding: 8px 5px;
    font-size: 0.76rem;
  }
  .pp-table th {
    letter-spacing: 0;
  }
}
.pp-sec {
  display: none;
}
@media (max-width: 699px) {
  .pp-filter {
    display: block;
    width: 100%;
  }
  .pp-filter select {
    display: block;
    width: 100%;
    margin-top: 4px;
  }
  .pp-table th:first-child,
  .pp-table td:first-child {
    display: none;
  }
  .pp-sec {
    display: inline;
    font-weight: 700;
  }
}
.pp-short {
  display: none;
}
@media (max-width: 699px) {
  .pp-long {
    display: none;
  }
  .pp-short {
    display: inline;
  }
  .pp-table td:nth-child(2) {
    min-width: 120px;
  }
}
@media (max-width: 699px) {
  .pp-table .th-sort {
    font-size: 0.68rem;
  }
  .pp-table th,
  .pp-table td {
    padding: 8px 4px;
  }
}

/* ---------------------------------------------------------------- question navigator (mock exam, MCQs by Topic)
   Desktop: a narrow sticky column, one number per row, as tall as the question area (up to the viewport) and
   scrolling inside. Phones: a swipeable strip in the sticky bar and the full grid as a bottom sheet. */
.nav-col {
  align-self: stretch;
  min-width: 0;
  contain: size; /* the row's height comes from the question area, not from 100 numbers */
}
.nav-col > .mock-nav {
  position: sticky;
  top: 76px;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: min(320px, calc(100vh - 92px));
  max-height: calc(100vh - 92px);
  padding: 10px 8px;
}
.nav-col .mock-grid {
  flex: 1 1 auto;
  min-height: 0;
  grid-template-columns: minmax(0, 1fr);
  align-content: start;
  gap: 4px;
  margin: 8px 0 0;
  padding: 2px 3px 4px;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.nav-col .mock-cell {
  height: 30px;
  font-size: 0.8rem;
}
.nav-legend {
  display: grid;
  gap: 3px;
  margin: 0;
  padding: 0 2px 8px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  font-size: 0.68rem;
  line-height: 1.25;
  list-style: none;
}
.nav-legend li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-dot {
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
}
.nav-dot.is-answered {
  background: var(--accent);
  border-color: var(--accent);
}
.nav-dot.is-correct {
  background: var(--fav);
  border-color: var(--fav);
}
.nav-dot.is-wrong {
  background: var(--unfav);
  border-color: var(--unfav);
}
.nav-dot.is-flagged {
  background: var(--chart-3);
  border-color: var(--chart-3);
}
.nav-dot.is-current {
  background: transparent;
  border: 2px solid var(--accent-strong);
}
.nav-sheet-head,
.q-strip {
  display: none;
}
.mock-main .mock-nav-actions {
  margin-top: 12px;
}
@media (max-width: 899px) {
  .nav-col {
    contain: none;
    align-self: auto;
  }
  .nav-col > .mock-nav:not(.is-review) {
    display: none;
  }
  .nav-col > .mock-nav.is-review {
    position: static;
    height: auto;
    min-height: 0;
    max-height: none;
    padding: 14px;
  }
  .nav-col .mock-nav.is-review .mock-grid,
  .nav-col .mock-nav.is-open .mock-grid {
    grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
    gap: 6px;
  }
  .nav-col .mock-nav.is-review .mock-grid {
    overflow: visible;
  }
  .nav-col .mock-nav.is-review .mock-cell,
  .nav-col .mock-nav.is-open .mock-cell {
    height: 40px;
    font-size: 0.85rem;
  }
  .nav-col .mock-nav.is-review .nav-legend,
  .nav-col .mock-nav.is-open .nav-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 14px;
    font-size: 0.75rem;
  }
  /* the full grid as a bottom sheet */
  .nav-col > .mock-nav.is-open {
    position: fixed;
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 70;
    display: flex;
    height: auto;
    min-height: 0;
    max-height: 75vh;
    padding: 12px 16px calc(14px + env(safe-area-inset-bottom));
    border-radius: 18px 18px 0 0;
    box-shadow: var(--shadow);
  }
  .mock-nav.is-open .nav-sheet-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
  }
  .nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 65;
    background: rgb(4 12 24 / 0.5);
  }
  body.nav-sheet-open {
    overflow: hidden;
  }
  /* the always-visible strip of numbers in the sticky session bar */
  .q-strip {
    display: flex;
    flex: 1 0 100%;
    gap: 6px;
    max-width: 100%;
    padding: 2px 2px 4px;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
  }
  .q-strip .mock-cell {
    flex: 0 0 auto;
    width: 40px;
    height: 36px;
    font-size: 0.82rem;
  }
}
@media (prefers-reduced-motion: no-preference) {
  .q-strip {
    scroll-behavior: smooth;
  }
}
/* During a mock exam or a session the status bar is the sticky header: the site header scrolls away, so the bar
   (timer, buttons, number strip) is never hidden under it. */
body:has(.mock-bar) .hub-header {
  position: static;
}
@media (max-width: 899px) {
  .q-strip {
    order: 10;
  }
}

/* ---------------------------------------------------------------- question reading
   Every question screen (section practice, MCQs by Topic, mock exam, results and review): normal-weight text in the
   reading font, about 72 characters per line, line-height 1.6, 16–20 px (A− / A+); compact tables sized to their
   content; quiet chips on one line. Bold only for table section/total rows and the source's own emphasis. */
.question-stem,
.option-btn,
.feedback {
  font-family: var(--font-read);
  font-size: var(--read-size);
  line-height: 1.6;
}
.question-stem {
  max-width: var(--read-measure);
  color: var(--read-text);
  font-weight: 400;
}
.option-btn:not(.correct):not(.incorrect) {
  color: var(--read-text);
}
.option-btn > span:last-child {
  max-width: var(--read-measure);
}
.feedback {
  color: var(--read-text);
}
.feedback > *,
.feedback li {
  max-width: var(--read-measure);
}
.feedback .verdict {
  font-family: var(--font-sans);
  font-size: 0.92em;
  font-weight: 600;
}
.feedback li > strong:first-child {
  font-weight: 600;
}
.question-num,
.option-letter {
  font-weight: 600;
}
/* chips: small, normal case, muted, one line (a long topic is shortened with an ellipsis; full text on hover) */
.question-meta {
  flex-wrap: nowrap;
  align-items: center;
  min-width: 0;
}
.question-meta .tag {
  flex: 0 1 auto;
  min-width: 0;
  overflow: hidden;
  padding: 1px 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0;
  text-overflow: ellipsis;
  text-transform: none;
  white-space: nowrap;
}
.question-meta > :first-child,
.question-meta > .chip-btn {
  flex: none;
}
.question-meta .tag.pq-tag {
  color: var(--note-text);
}
/* tables inside questions and explanations */
.question-stem .data-table-wrap,
.feedback .data-table-wrap {
  width: fit-content;
  max-width: min(640px, 100%);
  margin: 10px 0 12px;
  background: var(--surface);
  border: 1px solid var(--table-rule);
  border-radius: 8px;
}
.question-stem .data-table,
.feedback .data-table {
  width: auto;
  min-width: 0;
  background: transparent;
  font-family: var(--font-read);
  font-size: 0.94em;
}
.question-stem .data-table td,
.question-stem .data-table th,
.feedback .data-table td,
.feedback .data-table th {
  padding: 6px 12px;
  color: var(--read-text);
  background: transparent;
  border-top: 1px solid var(--table-rule);
  font-weight: 400;
}
.question-stem .data-table tr:first-child > *,
.feedback .data-table tr:first-child > * {
  border-top: 0;
}
.question-stem .data-table th,
.feedback .data-table th {
  color: var(--heading-2);
  background: var(--surface-2);
  font-size: inherit;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
}
.question-stem .data-table .num,
.feedback .data-table .num {
  font-family: var(--font-read);
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.question-stem .data-table td:empty,
.feedback .data-table td:empty {
  padding: 0 4px;
}
.question-stem .data-table tr.is-section > td,
.question-stem .data-table tr.is-total > td,
.feedback .data-table tr.is-section > td,
.feedback .data-table tr.is-total > td {
  font-weight: 700;
}
/* the "Aa" menu: text size and reading font */
.read-menu {
  position: relative;
}
.read-menu > summary {
  list-style: none;
  cursor: pointer;
  font-weight: 600;
}
.read-menu > summary::-webkit-details-marker {
  display: none;
}
.read-menu-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  display: grid;
  gap: 10px;
  width: max-content;
  max-width: min(320px, calc(100vw - 32px));
  padding: 12px 14px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-size: 0.85rem;
}
.read-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 0;
  padding: 0;
  border: 0;
}
.read-label {
  width: 100%;
  padding: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
}
.read-row output {
  min-width: 3.2em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.read-row label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
@media (max-width: 560px) {
  .read-menu-panel {
    right: auto;
    left: 0;
  }
}
.ps-mock {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  margin-bottom: 18px;
}
.ps-mock .ps-actions {
  margin-top: 0;
}
.practice-resume {
  margin-top: 8px;
}
/* the chip row never widens the question card; on narrow phones the chips may wrap instead of being cut */
.question-top > div {
  min-width: 0;
}
@media (max-width: 560px) {
  .question-meta {
    flex-wrap: wrap;
  }
  .question-meta .tag {
    max-width: 100%;
  }
}