@layer reset,base,layout,components,responsive;
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  body,
  h1,
  h2,
  h3,
  p,
  figure {
    margin: 0;
  }
  button,
  input,
  select,
  textarea {
    font: inherit;
  }
  button,
  a {
    -webkit-tap-highlight-color: transparent;
  }
  button {
    cursor: pointer;
  }
  img,
  svg {
    max-width: 100%;
  }
  [hidden] {
    display: none !important;
  }
}
@layer base {
  :root {
    color-scheme: dark;
    --bg: #0b1519;
    --surface: #111e23;
    --raised: #17272d;
    --line: #293a40;
    --ink: #ebf2ef;
    --muted: #a2b4b8;
    --accent: #91f1c8;
    --accent-strong: #3bba89;
    --accent-ink: #09281b;
    --warn: #f2ca8b;
    --error: #ffb0ab;
    --shadow: 0 24px 80px #0003;
    --font: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
    --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  }
  html {
    scroll-behavior: smooth;
    scroll-padding-top: 110px;
  }
  body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--ink);
    line-height: 1.65;
    font-size: 16px;
  }
  body.light {
    color-scheme: light;
    --bg: #f1f5f0;
    --surface: #fafcf8;
    --raised: #e6eee5;
    --line: #bccdc3;
    --ink: #152c23;
    --muted: #486357;
    --accent: #08754d;
    --accent-strong: #08754d;
    --accent-ink: #f5fff9;
    --warn: #775219;
    --error: #a92222;
    --shadow: 0 20px 60px #24462b12;
  }
  a {
    color: inherit;
    text-decoration: none;
  }
  p {
    color: var(--muted);
  }
  p + p {
    margin-top: 1em;
  }
  h1,
  h2,
  h3 {
    font-weight: 550;
    letter-spacing: -0.045em;
    line-height: 1.1;
    text-wrap: balance;
  }
  h1 {
    font-size: clamp(2.35rem, 4.8vw, 4.5rem);
  }
  h2 {
    font-size: clamp(1.7rem, 3vw, 2.85rem);
  }
  h3 {
    font-size: 1.25rem;
    letter-spacing: -0.025em;
  }
  em {
    color: var(--accent);
    font-style: normal;
  }
  strong {
    font-weight: 650;
  }
  ul,
  ol {
    padding-left: 1.3rem;
  }
  li + li {
    margin-top: 0.55rem;
  }
  button,
  input,
  select,
  textarea {
    color: var(--ink);
  }
  input,
  select,
  textarea {
    background: var(--bg);
    border: 1px solid var(--line);
    border-radius: 9px;
    padding: 12px 14px;
    width: 100%;
    outline: none;
  }
  input:focus,
  textarea:focus,
  select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
  }
  textarea {
    font-family: var(--mono);
    font-size: 0.85rem;
    resize: vertical;
    line-height: 1.7;
  }
  label {
    display: block;
    font-size: 0.9rem;
    color: var(--muted);
  }
  label > input,
  label > select,
  label > textarea {
    margin-top: 7px;
  }
  button {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--surface);
    padding: 8px 14px;
  }
  button:hover {
    border-color: var(--accent);
  }
  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
  }
  ::selection {
    background: var(--accent);
    color: var(--bg);
  }
  code,
  pre {
    font-family: var(--mono);
  }
  pre {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    font-size: 0.85rem;
    line-height: 1.9;
  }
  section[id] {
    scroll-margin-top: 110px;
  }
  details {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 16px 20px;
    margin: 14px 0;
  }
  summary {
    font-weight: 600;
    cursor: pointer;
    color: var(--ink);
  }
  details p,
  details pre {
    margin-top: 18px;
  }
  table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
  }
  th,
  td {
    border-bottom: 1px solid var(--line);
    padding: 14px;
  }
  th {
    color: var(--accent);
    font-size: 0.8rem;
  }
  caption {
    text-align: left;
    color: var(--muted);
    margin-bottom: 12px;
    font-size: 0.9rem;
  }
  fieldset {
    border: 0;
    padding: 0;
    margin: 0;
  }
  legend {
    font-size: 0.9rem;
    color: var(--muted);
    margin-bottom: 12px;
  }
}
@layer layout {
  .wrap {
    width: min(1240px, calc(100% - 72px));
    margin-inline: auto;
  }
  .section {
    padding-block: 80px;
  }
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 20px 36px;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--bg) 93%, transparent);
    backdrop-filter: blur(20px);
  }
  .brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    letter-spacing: -0.035em;
    font-weight: 700;
    line-height: 1.1;
    white-space: nowrap;
  }
  .brand-mark {
    background: var(--accent);
    color: var(--accent-ink);
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 11px;
    font-size: 26px;
  }
  .brand-light {
    font-weight: 400;
  }
  .brand small {
    display: block;
    font-family: var(--mono);
    letter-spacing: 0.15em;
    font-weight: 400;
    color: var(--muted);
    font-size: 9px;
    margin-top: 7px;
  }
  .site-header nav {
    display: flex;
    align-items: center;
    gap: 24px;
    font-size: 13px;
  }
  .site-header nav a {
    color: var(--muted);
    padding: 6px 0;
    position: relative;
  }
  .site-header nav a.active,
  .site-header nav a:hover {
    color: var(--ink);
  }
  .site-header nav a.active::after {
    content: "";
    position: absolute;
    height: 2px;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--accent);
  }
  .header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .icon-btn {
    background: transparent;
    padding: 5px 8px;
    min-width: 35px;
    border: 0;
    font-size: 22px;
  }
  .icon-btn kbd {
    font-size: 12px;
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 0 5px;
    margin-left: 4px;
  }
  .progress-link {
    font-size: 13px;
    background: var(--raised);
    padding: 8px 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    white-space: nowrap;
  }
  .hero {
    display: grid;
    grid-template-columns: 1.06fr 1fr;
    gap: 30px;
    align-items: center;
    min-height: 690px;
    padding-block: 65px;
  }
  .hero h1 {
    font-size: clamp(3rem, 5.3vw, 5.1rem);
    margin: 24px 0;
    letter-spacing: -0.065em;
  }
  .hero-copy > p {
    max-width: 500px;
    font-size: 1.12rem;
    line-height: 1.8;
  }
  .hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 34px 0;
  }
  .hero-proof {
    display: flex;
    gap: 25px;
    padding-top: 25px;
    border-top: 1px solid var(--line);
    max-width: 500px;
    font-size: 0.8rem;
    color: var(--muted);
  }
  .hero-proof strong {
    color: var(--ink);
    font-size: 1.5rem;
    display: block;
    letter-spacing: -0.04em;
    font-weight: 550;
  }
  .hero-map {
    position: relative;
    align-self: center;
    background-image: radial-gradient(var(--line) 0.8px, transparent 0.8px);
    background-size: 24px 24px;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 25px 20px 18px;
    box-shadow: var(--shadow);
  }
  .hero-map svg {
    width: 100%;
    margin-top: 15px;
  }
  .map-label {
    font: 9px var(--mono);
    letter-spacing: 0.16em;
    color: var(--muted);
  }
  .hero-map > p {
    font-size: 12px;
    min-height: 46px;
    text-align: center;
    max-width: 440px;
    margin: 13px auto 0;
  }
  .network-explorer {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
  }
  .network-explorer button {
    font: 11px var(--mono);
    border-radius: 20px;
    padding: 7px 12px;
  }
  .hero-device rect,
  .hero-device circle {
    fill: var(--raised);
    stroke: var(--accent-strong);
    stroke-width: 1.4;
  }
  .hero-device path {
    stroke: var(--accent);
    stroke-width: 1.5;
    fill: none;
  }
  .hero-device text {
    text-anchor: middle;
    fill: var(--muted);
    font: 10px var(--mono);
    letter-spacing: 1px;
  }
  .hero-wires path {
    stroke: var(--line);
    stroke-width: 2;
    fill: none;
  }
  .hero-wires .packet {
    stroke: var(--accent);
    stroke-width: 2;
    stroke-dasharray: 10 160;
    animation: packet 8s linear infinite;
  }
  .hero-wires .second {
    animation-delay: -4s;
  }
  .hero-label {
    fill: var(--muted);
    font: 9px var(--mono);
  }
  @keyframes packet {
    to {
      stroke-dashoffset: -680;
    }
  }
  .signal-strip {
    border-block: 1px solid var(--line);
    background: var(--surface);
  }
  .signal-strip > div {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 24px 0;
    font: 11px var(--mono);
    letter-spacing: 0.1em;
  }
  .signal-strip i {
    color: var(--accent);
    font-style: normal;
  }
  .section-heading {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 30px;
    margin-bottom: 32px;
  }
  .section-heading h2 {
    margin-top: 14px;
  }
  .section-heading.compact h2 {
    margin: 0;
    font-size: 1.55rem;
  }
  .section-heading.compact {
    margin-bottom: 20px;
  }
  .module-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  .module-card {
    border: 1px solid var(--line);
    border-radius: 15px;
    padding: 25px;
    background: var(--surface);
    position: relative;
    overflow: hidden;
    transition:
      transform 0.2s,
      border-color 0.2s;
  }
  .module-card:hover {
    border-color: var(--accent-strong);
    transform: translateY(-5px);
  }
  .module-top,
  .module-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
  }
  .module-number {
    font: 14px var(--mono);
    color: var(--muted);
  }
  .module-symbol {
    font: 36px var(--mono);
    letter-spacing: -0.08em;
    color: var(--accent);
    height: 80px;
    display: flex;
    align-items: center;
  }
  .module-card h3 {
    font-size: 1.5rem;
  }
  .module-card p {
    font-size: 0.9rem;
    margin: 12px 0 28px;
    min-height: 46px;
  }
  .module-bottom {
    font-size: 11px;
    color: var(--muted);
  }
  .module-bottom > span:last-child {
    font-size: 21px;
    color: var(--accent);
  }
  .mini-progress {
    height: 2px;
    background: var(--line);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
  }
  .mini-progress i {
    display: block;
    height: 100%;
    width: 0;
    background: var(--accent);
  }
  .centered {
    display: table;
    margin: 30px auto 0;
  }
  .feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .feature-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 42px;
    overflow: hidden;
  }
  .feature-panel h2 {
    margin: 18px 0 24px;
    font-size: 2.55rem;
  }
  .feature-panel > p {
    margin-bottom: 25px;
  }
  .feature-panel.alt {
    background: var(--raised);
  }
  .code-preview,
  .quiz-preview {
    border: 1px solid var(--line);
    background: var(--bg);
    border-radius: 12px;
    padding: 25px;
    margin-top: 30px;
    font-family: var(--mono);
    font-size: 12px;
  }
  .code-preview > span,
  .quiz-preview > span {
    color: var(--accent);
    font-size: 11px;
  }
  .code-preview p {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    margin-top: 15px;
    font-size: 10px;
  }
  .code-preview b {
    color: var(--ink);
    font-size: 12px;
  }
  .quiz-preview p {
    font-size: 2rem;
    margin: 15px 0;
    color: var(--ink);
  }
  .quiz-preview strong {
    color: var(--accent);
  }
  .quiz-preview small {
    display: block;
    color: var(--muted);
    margin-top: 15px;
    line-height: 1.8;
  }
  .quiz-preview {
    margin-top: 0;
    margin-bottom: 25px;
  }
  .domain-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 14px;
  }
  .domain-card {
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
  }
  .domain-card strong {
    font-size: 2.1rem;
    letter-spacing: -0.055em;
    color: var(--accent);
    font-weight: 500;
  }
  .domain-card strong small {
    font-size: 1rem;
    margin-left: 3px;
  }
  .domain-card > span {
    display: block;
    font-size: 12px;
    line-height: 1.4;
    margin-top: 9px;
    min-height: 36px;
  }
  .weight {
    height: 3px;
    background: var(--line);
    margin-top: 20px;
  }
  .weight i {
    display: block;
    height: 100%;
    background: var(--accent);
  }
  .page-heading {
    padding-block: 64px 42px;
  }
  .page-heading h1 {
    margin: 20px 0 24px;
  }
  .page-heading p {
    max-width: 750px;
    font-size: 1.08rem;
  }
  .module-overview > p {
    margin: 25px 0;
  }
  .lesson-list {
    display: grid;
    gap: 12px;
  }
  .lesson-card {
    display: flex;
    align-items: center;
    gap: 24px;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 24px;
    background: var(--surface);
    transition: border-color 0.2s;
  }
  .lesson-card:hover {
    border-color: var(--accent);
  }
  .lesson-index {
    font: 22px var(--mono);
    color: var(--accent);
    width: 34px;
    flex-shrink: 0;
  }
  .lesson-card h3 {
    margin: 7px 0;
    font-size: 1.3rem;
  }
  .lesson-card p {
    font-size: 0.9rem;
  }
  .lesson-card .arrow {
    margin-left: auto;
    color: var(--accent);
    font-size: 25px;
  }
  .breadcrumb {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--muted);
    padding-block: 27px;
  }
  .breadcrumb a:hover {
    color: var(--accent);
  }
  .course-layout {
    display: grid;
    grid-template-columns: 245px minmax(0, 1fr);
    gap: 64px;
  }
  .course-sidebar {
    align-self: start;
    position: sticky;
    top: 115px;
    max-height: calc(100vh - 145px);
    overflow: auto;
    padding-right: 12px;
  }
  .course-sidebar h2 {
    font-size: 1.25rem;
    margin: 15px 0 22px;
  }
  .course-sidebar nav {
    display: grid;
    gap: 6px;
  }
  .course-sidebar nav a {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 12px;
    color: var(--muted);
    padding: 10px;
    border-left: 2px solid transparent;
    border-radius: 0 6px 6px 0;
  }
  .course-sidebar nav a[aria-current] {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--surface);
  }
  .course-sidebar nav .completion-dot {
    margin-top: 5px;
    flex-shrink: 0;
  }
  .sidebar-note {
    font-size: 11px;
    color: var(--muted);
    padding: 20px 10px;
    border-top: 1px solid var(--line);
    margin-top: 20px;
  }
  .course-content {
    min-width: 0;
  }
  .course-header h1 {
    font-size: clamp(2.2rem, 4vw, 3.7rem);
    margin: 18px 0 22px;
  }
  .course-header .lead {
    margin-top: 28px;
    font-size: 1.09rem;
    line-height: 1.9;
  }
  .tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
  }
  .lesson-toc {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 12px;
    padding: 20px 0;
    border-block: 1px solid var(--line);
    margin-top: 30px;
    color: var(--muted);
  }
  .lesson-toc a:hover {
    color: var(--accent);
  }
  .course-content > section {
    padding-top: 44px;
  }
  .course-content section h2 {
    font-size: 1.8rem;
    margin-bottom: 22px;
  }
  .course-content section h3 {
    margin: 24px 0 15px;
  }
  .course-content p {
    line-height: 1.9;
  }
  .objectives-list {
    font-size: 0.9rem;
    color: var(--muted);
    list-style: none;
    padding: 0;
  }
  .objectives-list li {
    display: flex;
    gap: 15px;
  }
  .objectives-list strong {
    color: var(--accent);
    font-family: var(--mono);
    flex-shrink: 0;
  }
  .schema-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 20px;
    overflow: hidden;
  }
  .schema-panel svg {
    width: 100%;
    display: block;
    color: var(--accent);
  }
  .schema-node rect {
    fill: var(--raised);
    stroke: var(--line);
    stroke-width: 1.5;
    transition: stroke 0.3s;
  }
  .schema-node circle {
    fill: var(--accent);
  }
  .schema-node text {
    fill: var(--ink);
    font: 10px var(--mono);
  }
  .schema-node text.node-number {
    fill: var(--muted);
    font-size: 9px;
  }
  .schema-node.active rect {
    stroke: var(--accent);
  }
  .schema-link {
    stroke: var(--accent);
    stroke-width: 1.4;
    fill: none;
  }
  .schema-grid {
    stroke: var(--line);
    stroke-width: 0.6;
    stroke-dasharray: 2 5;
    opacity: 0.5;
  }
  .schema-caption {
    font: 8px var(--mono);
    letter-spacing: 1px;
    fill: var(--muted);
  }
  figcaption {
    font-size: 11px;
    color: var(--muted);
    padding-bottom: 10px;
  }
  .topology-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px 20px;
    margin-top: 24px;
    overflow-x: auto;
  }
  .topology-panel svg {
    width: 100%;
    min-width: 480px;
    display: block;
  }
  .topology-device rect {
    fill: var(--raised);
    stroke: var(--accent-strong);
    stroke-width: 1.3;
  }
  .topology-device circle {
    fill: var(--accent);
  }
  .topology-device text {
    fill: var(--ink);
    font: 9px var(--mono);
  }
  .topology-links path {
    stroke: var(--accent-strong);
    stroke-width: 1.5;
    fill: none;
  }
  .topology-panel figcaption {
    font-size: 12px;
    line-height: 1.8;
  }
  .schema-controls {
    display: flex;
    gap: 9px;
    margin: 15px 0;
  }
  .schema-controls button {
    font: 12px var(--mono);
  }
  .selected {
    border-color: var(--accent) !important;
    background: color-mix(
      in srgb,
      var(--accent) 12%,
      var(--surface)
    ) !important;
    color: var(--accent) !important;
  }
  .schema-explanation {
    font-size: 0.9rem;
    padding: 18px;
    background: var(--surface);
    border-left: 2px solid var(--accent);
    min-height: 85px;
  }
  .learning-step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 22px 0;
    border-top: 1px solid var(--line);
  }
  .learning-step > span {
    font: 15px var(--mono);
    color: var(--accent);
    margin-top: 5px;
  }
  .learning-step p {
    font-size: 1rem;
  }
  .code-block {
    border: 1px solid var(--line);
    border-radius: 12px;
    overflow: hidden;
    background: var(--surface);
  }
  .code-head {
    padding: 10px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--line);
    font: 10px var(--mono);
    color: var(--muted);
  }
  .code-head button {
    font-size: 11px;
  }
  .code-block pre {
    padding: 24px;
    color: var(--accent);
  }
  .exercise-panel {
    padding: 25px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
  }
  .related-labs > a {
    display: flex;
    justify-content: space-between;
    gap: 15px;
    padding: 15px 0;
    border-bottom: 1px solid var(--line);
    color: var(--accent);
    font-size: 0.9rem;
  }
  .related-labs span {
    white-space: nowrap;
  }
  .takeaways {
    margin-top: 44px;
    padding: 30px !important;
    border: 1px solid var(--accent-strong);
    border-radius: 12px;
    background: var(--surface);
  }
  .takeaways .btn {
    margin: 24px 0 12px;
  }
  .sources-block a {
    color: var(--accent);
    font-size: 0.85rem;
  }
  .sources-block h2 {
    font-size: 1.3rem !important;
  }
  .lesson-navigation {
    display: flex;
    justify-content: space-between;
    gap: 25px;
    border-top: 1px solid var(--line);
    margin-top: 40px;
    padding-top: 25px;
  }
  .lesson-navigation a {
    flex: 1;
    max-width: 50%;
    font-size: 1rem;
  }
  .lesson-navigation a:last-child {
    text-align: right;
  }
  .lesson-navigation small {
    display: block;
    font: 10px var(--mono);
    color: var(--accent);
    margin-bottom: 10px;
  }
  .lab-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }
  .lab-card {
    padding: 25px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
  }
  .lab-card:hover {
    border-color: var(--accent);
  }
  .lab-card h2 {
    font-size: 1.4rem;
    margin: 20px 0 15px;
  }
  .lab-card p {
    font-size: 0.85rem;
    margin-bottom: 25px;
  }
  .lab-article,
  .sources-article {
    max-width: 900px;
  }
  .lab-article > h2,
  .sources-article > h2 {
    margin: 45px 0 20px;
    font-size: 1.8rem;
  }
  .lab-article figure {
    margin: 25px 0;
  }
  .lab-article .btn {
    margin-top: 30px;
  }
  .quiz-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(250px, 1fr);
    gap: 30px;
    align-items: start;
  }
  .quiz-sidebar {
    padding: 25px;
  }
  .quiz-sidebar h2 {
    font-size: 2rem;
    margin: 22px 0;
  }
  .quiz-sidebar li {
    color: var(--muted);
    font-size: 0.9rem;
  }
  .quiz-sidebar a {
    color: var(--accent);
    font-size: 0.9rem;
  }
  .quiz-layout:has(#quiz-session:not([hidden])),
  .quiz-layout:has(#quiz-results:not([hidden])) {
    display: block;
    max-width: 900px;
  }
  .quiz-layout:has(#quiz-session:not([hidden])) .quiz-sidebar,
  .quiz-layout:has(#quiz-results:not([hidden])) .quiz-sidebar {
    display: none;
  }
  .quiz-layout h2 {
    margin-bottom: 25px;
    font-size: 1.8rem;
  }
  .mode-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 25px;
  }
  .mode-grid legend {
    grid-column: 1/-1;
  }
  .mode-grid label {
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 15px 10px;
    position: relative;
  }
  .mode-grid label:has(input:checked) {
    border-color: var(--accent);
    background: var(--raised);
  }
  .mode-grid input {
    width: auto;
    accent-color: var(--accent);
  }
  .mode-grid strong {
    display: block;
    font-size: 0.9rem;
    color: var(--ink);
    margin-top: 8px;
  }
  .mode-grid small {
    font-size: 11px;
  }
  .form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 20px;
  }
  .form-grid + label {
    margin-bottom: 15px;
  }
  form > .btn {
    margin-top: 20px;
  }
  .quiz-status {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    font: 12px var(--mono);
    color: var(--muted);
    margin-bottom: 12px;
  }
  .quiz-bar {
    height: 4px;
    background: var(--line);
    border-radius: 2px;
    margin-bottom: 28px;
  }
  .quiz-bar i {
    display: block;
    height: 100%;
    background: var(--accent);
  }
  .question-title {
    font-size: 1.5rem !important;
    line-height: 1.45;
    letter-spacing: -0.025em;
    margin: 15px 0 25px;
  }
  .choices {
    display: grid;
    gap: 12px;
    border: 0;
  }
  .choice {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--ink);
    font-size: 0.95rem;
  }
  .choice input {
    width: auto;
    flex-shrink: 0;
    margin-top: 5px;
    accent-color: var(--accent);
  }
  .choice:has(input:checked) {
    border-color: var(--accent);
    background: var(--raised);
  }
  .choice.correct {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  }
  .choice.incorrect {
    border-color: var(--error);
  }
  .feedback {
    margin-top: 22px;
    border-left: 3px solid var(--accent);
    background: var(--raised);
    padding: 20px;
  }
  .feedback.bad {
    border-color: var(--error);
  }
  .feedback strong {
    display: block;
    margin-bottom: 10px;
  }
  .feedback a {
    color: var(--accent);
    text-decoration: underline;
    font-size: 0.85rem;
  }
  .feedback ul {
    font-size: 0.85rem;
    color: var(--muted);
  }
  .quiz-buttons {
    display: flex;
    gap: 12px;
    justify-content: space-between;
    margin-top: 24px;
    flex-wrap: wrap;
  }
  .score-big {
    font-size: 5rem;
    color: var(--accent);
    letter-spacing: -0.08em;
    line-height: 1.2;
    margin: 25px 0;
  }
  .score-big small {
    font-size: 1.5rem;
    color: var(--muted);
    letter-spacing: 0;
  }
  .results-domains {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 25px 0;
  }
  .results-domains > div {
    padding: 15px;
    background: var(--raised);
    border-radius: 9px;
    font-size: 0.8rem;
  }
  .results-domains strong {
    display: block;
    font-size: 1.2rem;
    color: var(--accent);
  }
  .tools-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .tool h2 {
    font-size: 1.65rem;
    margin: 15px 0 25px;
  }
  .tool.full {
    grid-column: 1/-1;
  }
  .tool form > label {
    margin-bottom: 15px;
  }
  .tool-result {
    margin-top: 22px;
  }
  .tool-result:empty {
    display: none;
  }
  .result-pairs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .result-pairs > div {
    padding: 13px;
    background: var(--raised);
    border-radius: 9px;
  }
  .result-pairs span {
    display: block;
    font: 10px var(--mono);
    color: var(--muted);
  }
  .result-pairs strong {
    font: 15px var(--mono);
    color: var(--accent);
  }
  .bit-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 6px;
    margin: 20px 0;
  }
  .bit-grid > div {
    text-align: center;
    background: var(--raised);
    border: 1px solid var(--line);
    padding: 10px 0;
    border-radius: 6px;
  }
  .bit-grid strong {
    color: var(--accent);
    font: 22px var(--mono);
    display: block;
  }
  .bit-grid small {
    font-size: 9px;
    color: var(--muted);
  }
  .tool a {
    font-size: 0.85rem;
    color: var(--accent);
  }
  .tool .tool-result table {
    font-size: 0.75rem;
  }
  .glossary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .glossary-card {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
    padding: 25px;
  }
  .glossary-card h2 {
    font-size: 1.6rem;
    margin-bottom: 10px;
    color: var(--accent);
  }
  .glossary-card p {
    font-size: 0.9rem;
    margin: 17px 0;
  }
  .glossary-card a {
    font-size: 0.8rem;
    color: var(--accent);
  }
  .command-table {
    overflow-x: auto;
  }
  .command-table code {
    color: var(--accent);
    font-size: 0.85rem;
  }
  .stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 28px;
  }
  .stat {
    padding: 25px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: var(--surface);
  }
  .stat strong {
    display: block;
    color: var(--accent);
    font-size: 2.6rem;
    letter-spacing: -0.04em;
    line-height: 1.4;
  }
  .stat span {
    font-size: 0.9rem;
    color: var(--muted);
  }
  .progress-row {
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    font-size: 0.9rem;
  }
  .progress-row > a {
    display: flex;
    justify-content: space-between;
    gap: 12px;
  }
  .progress-row small {
    color: var(--accent);
  }
  .progress-bar {
    height: 4px;
    background: var(--line);
    margin-top: 12px;
    border-radius: 2px;
  }
  .progress-bar i {
    display: block;
    height: 100%;
    background: var(--accent);
  }
  .history-row {
    font-size: 0.8rem;
    color: var(--muted);
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }
  .recommendation {
    display: block;
    color: var(--accent);
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    font-size: 0.9rem;
  }
  .data-controls {
    margin-top: 25px;
  }
  .data-controls > p {
    margin: 15px 0 22px;
  }
  .data-controls .btn {
    margin: 0 10px 10px 0;
  }
  .file-button {
    position: relative;
    cursor: pointer;
  }
  .file-button input {
    position: absolute;
    inset: 0;
    opacity: 0;
    width: 100%;
    cursor: pointer;
  }
  .source-list article {
    padding: 25px 0;
    border-bottom: 1px solid var(--line);
    overflow-wrap: anywhere;
  }
  .source-list h3 {
    font-size: 1.2rem;
    color: var(--accent);
    margin-bottom: 14px;
  }
  .source-list small {
    display: block;
    margin-top: 10px;
    color: var(--muted);
    font: 10px var(--mono);
    overflow-wrap: anywhere;
  }
  .coverage-domain {
    margin-top: 45px;
  }
  .objective-row {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid var(--line);
  }
  .objective-row > strong {
    font: 15px var(--mono);
    color: var(--accent);
    min-width: 55px;
  }
  .objective-row h3 {
    font-size: 1rem;
    letter-spacing: 0;
    line-height: 1.6;
  }
  .objective-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    font-size: 0.8rem;
    color: var(--muted);
    margin-top: 10px;
  }
  .objective-links a:hover {
    color: var(--accent);
  }
  .objective-row .covered {
    margin-left: auto;
    color: var(--accent);
  }
  .sub-objective {
    padding-left: 28px;
  }
  .site-footer {
    width: min(1240px, calc(100% - 72px));
    margin: 90px auto 0;
    border-top: 1px solid var(--line);
    padding: 36px 0 45px;
    display: flex;
    justify-content: space-between;
    gap: 30px;
  }
  .footer-brand p {
    font-size: 1.3rem;
    color: var(--ink);
    line-height: 1.5;
    margin-top: 15px;
    letter-spacing: -0.03em;
  }
  .site-footer > div:last-child {
    text-align: right;
  }
  .site-footer a {
    font-size: 12px;
    margin-left: 20px;
  }
  .site-footer > div:last-child p {
    font-size: 11px;
    margin-top: 20px;
    color: var(--muted);
  }
  dialog {
    background: var(--surface);
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 20px;
    width: min(680px, calc(100% - 32px));
    max-height: 85vh;
    padding: 32px;
    box-shadow: var(--shadow);
  }
  dialog::backdrop {
    background: #061015b8;
    backdrop-filter: blur(7px);
  }
  dialog h2 {
    font-size: 1.8rem;
    margin: 15px 0 22px;
  }
  .dialog-close {
    position: absolute;
    right: 15px;
    top: 10px;
  }
  #search-results {
    max-height: 50vh;
    overflow: auto;
    margin-top: 18px;
  }
  #search-results a {
    display: block;
    padding: 13px 5px;
    border-bottom: 1px solid var(--line);
    font-size: 0.9rem;
  }
  #search-results small {
    display: block;
    font: 9px var(--mono);
    color: var(--accent);
  }
  #search-results p {
    padding: 15px 0;
  }
  .toast {
    position: fixed;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    background: var(--accent);
    color: var(--accent-ink);
    padding: 12px 22px;
    border-radius: 12px;
    font-size: 0.85rem;
    box-shadow: var(--shadow);
    max-width: 90vw;
  }
}
@layer components {
  .eyebrow {
    font: 10px var(--mono);
    letter-spacing: 0.1em;
    color: var(--accent);
    line-height: 1.6;
  }
  .status-badge {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 20px;
    font: 10px var(--mono);
    letter-spacing: 0.04em;
    color: var(--muted);
    background: var(--surface);
  }
  .status-badge > span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 10%, transparent);
  }
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 22px;
    padding: 13px 19px;
    border-radius: 8px;
    border: 1px solid var(--line);
    font-size: 0.83rem;
    font-weight: 650;
    line-height: 1.5;
    transition:
      transform 0.2s,
      background 0.2s;
  }
  .btn:hover {
    transform: translateY(-2px);
  }
  .btn.primary {
    background: var(--accent);
    color: var(--accent-ink);
    border-color: var(--accent);
  }
  .btn.secondary {
    background: var(--surface);
    color: var(--ink);
  }
  .btn.danger {
    color: var(--error);
  }
  .btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
  }
  .text-link {
    font-size: 0.8rem;
    color: var(--accent);
    white-space: nowrap;
  }
  .pill {
    font: 9px var(--mono);
    color: var(--muted);
    background: var(--raised);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 5px 9px;
    white-space: nowrap;
  }
  .muted {
    color: var(--muted);
    font-size: 0.85rem;
  }
  .narrow {
    max-width: 370px;
  }
  .panel {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 32px;
  }
  .callout {
    border: 1px solid var(--line);
    border-left: 3px solid var(--accent);
    border-radius: 10px;
    background: var(--surface);
    padding: 22px 25px;
    margin: 24px 0;
  }
  .callout > p {
    margin-top: 10px;
    font-size: 0.9rem;
  }
  .callout.warning {
    border-left-color: var(--warn);
  }
  .warning > .eyebrow {
    color: var(--warn);
  }
  .callout li {
    color: var(--muted);
    font-size: 0.9rem;
  }
  .completion-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1px solid var(--muted);
    display: inline-block;
    flex-shrink: 0;
  }
  .completion-dot.done {
    background: var(--accent);
    border-color: var(--accent);
  }
  .filter-bar {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 18px 22px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 12px;
    margin-bottom: 25px;
  }
  .filter-bar input {
    flex: 1;
    max-width: 650px;
  }
  .filter-bar label {
    white-space: nowrap;
    font-size: 0.8rem;
  }
  .filter-bar > span {
    margin-left: auto;
    font: 11px var(--mono);
    color: var(--muted);
    white-space: nowrap;
  }
  .check-label {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .check-label input {
    width: auto;
    margin: 0;
    accent-color: var(--accent);
  }
  .error {
    color: var(--error);
    font-size: 0.9rem;
    margin-top: 15px;
  }
  .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;
  }
  .skip {
    position: fixed;
    top: -80px;
    left: 20px;
    background: var(--accent);
    color: var(--accent-ink);
    padding: 10px;
    z-index: 100;
  }
  .skip:focus {
    top: 10px;
  }
  .resume-banner {
    background: var(--raised);
    border: 1px solid var(--accent);
    padding: 20px 25px;
    border-radius: 12px;
    margin-bottom: 24px;
  }
  .resume-banner a {
    color: var(--accent);
  }
  .no-js {
    background: var(--raised);
    border: 1px solid var(--warn);
    padding: 15px;
    font-size: 0.9rem;
    text-align: center;
  }
  #quiz-resume {
    margin-top: 25px;
    border-top: 1px solid var(--line);
    padding-top: 20px;
  }
  #quiz-resume button {
    margin: 12px 8px 0 0;
  }
  #quiz-history h3 {
    margin-top: 30px;
  }
}
@layer responsive {
  @media (min-width: 1550px) {
    .hero {
      min-height: 760px;
    }
    .hero h1 {
      font-size: 5.5rem;
    }
  }
  @media (max-width: 1100px) {
    .site-header {
      gap: 15px;
      padding: 16px 24px;
    }
    .site-header nav {
      gap: 15px;
    }
    .progress-link span {
      display: none;
    }
    .header-actions {
      gap: 5px;
    }
    .hero {
      min-height: 590px;
    }
    .hero h1 {
      font-size: 3.8rem;
    }
    .hero-actions .btn {
      font-size: 0.78rem;
      padding: 12px 14px;
    }
    .domain-grid {
      grid-template-columns: repeat(3, 1fr);
    }
    .course-layout {
      gap: 32px;
      grid-template-columns: 210px minmax(0, 1fr);
    }
    .feature-panel {
      padding: 30px;
    }
    .feature-panel h2 {
      font-size: 2.2rem;
    }
  }
  @media (max-width: 800px) {
    .wrap {
      width: calc(100% - 40px);
    }
    .site-header {
      flex-wrap: wrap;
      padding: 14px 20px;
      row-gap: 14px;
    }
    .brand {
      font-size: 1rem;
    }
    .site-header nav {
      order: 3;
      width: 100%;
      justify-content: space-between;
      gap: 12px;
      overflow: auto;
      white-space: nowrap;
      font-size: 12px;
    }
    .header-actions {
      margin-left: auto;
    }
    .hero {
      grid-template-columns: 1fr;
      padding-block: 45px;
      gap: 40px;
      min-height: 0;
    }
    .hero h1 {
      font-size: clamp(3.1rem, 8.5vw, 5rem);
    }
    .hero-copy > p {
      max-width: 600px;
    }
    .hero-map {
      max-width: 620px;
      width: 100%;
      margin: auto;
    }
    .hero-proof {
      max-width: none;
    }
    .signal-strip > div {
      font-size: 9px;
      gap: 8px;
    }
    .module-grid,
    .lab-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .feature-grid {
      grid-template-columns: 1fr;
    }
    .section {
      padding-block: 50px;
    }
    .section-heading {
      align-items: flex-start;
    }
    .section-heading > .narrow {
      max-width: 250px;
    }
    .course-layout {
      display: block;
    }
    .course-sidebar {
      position: static;
      max-height: none;
      padding: 0;
      margin-bottom: 30px;
    }
    .course-sidebar nav {
      display: flex;
      gap: 10px;
      overflow: auto;
      max-height: 120px;
    }
    .course-sidebar nav a {
      min-width: 160px;
      max-width: 200px;
      align-items: center;
      border: 1px solid var(--line);
      border-radius: 8px;
      font-size: 11px;
      padding: 10px;
    }
    .course-sidebar h2 {
      margin: 10px 0 15px;
    }
    .sidebar-note {
      display: none;
    }
    .course-content {
      max-width: 780px;
    }
    .course-content .course-header h1 {
      font-size: 2.6rem;
    }
    .quiz-layout {
      grid-template-columns: 1fr;
    }
    .quiz-sidebar {
      display: none;
    }
    .tools-grid {
      grid-template-columns: 1fr;
    }
    .tool.full {
      grid-column: auto;
    }
    .glossary-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .site-footer {
      width: calc(100% - 40px);
      margin-top: 55px;
      flex-direction: column;
    }
    .site-footer > div:last-child {
      text-align: left;
    }
    .site-footer a {
      margin: 0 20px 0 0;
    }
    .page-heading {
      padding-block: 42px 30px;
    }
    .page-heading h1 {
      font-size: 2.8rem;
    }
    .panel {
      padding: 25px;
    }
    .filter-bar {
      gap: 12px;
      padding: 15px;
      flex-wrap: wrap;
    }
    .filter-bar input {
      min-width: 180px;
    }
    .filter-bar > span {
      font-size: 10px;
    }
    .stats-grid {
      gap: 12px;
    }
    .stat {
      padding: 18px;
    }
    .stat strong {
      font-size: 2.1rem;
    }
  }
  @media (max-width: 500px) {
    .hero h1 {
      font-size: 3.25rem;
      letter-spacing: -0.065em;
    }
    .hero-copy > p {
      font-size: 1rem;
    }
    .hero-actions {
      gap: 10px;
    }
    .hero-actions .btn {
      flex: 1;
      white-space: nowrap;
      gap: 10px;
      padding: 12px 10px;
      font-size: 11px;
    }
    .hero-proof {
      gap: 24px;
      font-size: 0.7rem;
    }
    .hero-map {
      padding: 18px 10px;
    }
    .hero-map > p {
      font-size: 11px;
    }
    .signal-strip i {
      display: none;
    }
    .signal-strip > div {
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px 22px;
      font-size: 8px;
    }
    .module-grid,
    .lab-grid {
      grid-template-columns: 1fr;
    }
    .module-symbol {
      height: 65px;
    }
    .module-card p {
      min-height: 0;
    }
    .module-card {
      padding: 24px;
    }
    .section-heading {
      flex-direction: column;
      gap: 18px;
    }
    .section-heading.compact {
      flex-direction: row;
      align-items: center;
      gap: 10px;
    }
    .section-heading > .narrow {
      max-width: none;
    }
    .feature-panel h2 {
      font-size: 2rem;
    }
    .feature-panel {
      padding: 25px;
    }
    .domain-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
    }
    .domain-card {
      padding: 16px;
    }
    .lesson-card {
      gap: 12px;
      padding: 18px 14px;
    }
    .lesson-index {
      font-size: 16px;
      width: 22px;
    }
    .lesson-card h3 {
      font-size: 1.1rem;
    }
    .lesson-card p {
      display: none;
    }
    .lesson-card .eyebrow {
      font-size: 8px;
    }
    .lesson-card .arrow {
      font-size: 18px;
    }
    .course-header .lead {
      font-size: 1rem;
    }
    .course-content .course-header h1 {
      font-size: 2.3rem;
    }
    .lesson-toc {
      gap: 10px 18px;
      font-size: 11px;
    }
    .schema-panel {
      padding: 10px;
    }
    .schema-panel svg {
      min-width: 480px;
    }
    .schema-panel {
      overflow-x: auto;
    }
    .schema-explanation {
      min-height: 120px;
      font-size: 0.85rem;
    }
    .course-content > section {
      padding-top: 35px;
    }
    .learning-step {
      gap: 14px;
    }
    .learning-step p {
      font-size: 0.95rem;
    }
    .code-block pre {
      padding: 18px;
      font-size: 0.75rem;
    }
    .exercise-panel {
      padding: 20px;
    }
    .takeaways {
      padding: 24px !important;
    }
    .lesson-navigation {
      gap: 18px;
    }
    .lesson-navigation a {
      font-size: 0.9rem;
    }
    .mode-grid {
      grid-template-columns: 1fr;
    }
    .mode-grid label {
      padding: 12px;
      display: grid;
      grid-template-columns: auto 1fr;
      column-gap: 12px;
      align-items: center;
    }
    .mode-grid input {
      grid-row: 1/3;
      margin: 0;
    }
    .mode-grid strong {
      margin: 0;
    }
    .mode-grid small {
      grid-column: 2;
    }
    .form-grid {
      grid-template-columns: 1fr;
      gap: 15px;
    }
    .panel {
      padding: 22px;
    }
    .quiz-status {
      font-size: 10px;
    }
    .question-title {
      font-size: 1.15rem !important;
    }
    .choice {
      padding: 15px 12px;
      font-size: 0.85rem;
    }
    .results-domains {
      grid-template-columns: repeat(2, 1fr);
    }
    .result-pairs {
      grid-template-columns: 1fr;
    }
    .glossary-grid {
      grid-template-columns: 1fr;
    }
    .stats-grid {
      grid-template-columns: 1fr;
    }
    .stat {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .stat strong {
      font-size: 2rem;
    }
    .objective-row {
      gap: 12px;
      padding: 18px 0;
    }
    .objective-row > strong {
      font-size: 12px;
      min-width: 45px;
    }
    .objective-row h3 {
      font-size: 0.9rem;
    }
    .sub-objective {
      padding-left: 12px;
    }
    .covered {
      display: none;
    }
    .source-list small {
      font-size: 9px;
    }
    .filter-bar label {
      width: 100%;
    }
    .filter-bar input {
      min-width: 0;
    }
    .site-footer a {
      display: inline-block;
      margin-bottom: 10px;
    }
    .toast {
      width: calc(100% - 40px);
      text-align: center;
    }
    .page-heading h1 {
      font-size: 2.5rem;
    }
    .data-controls .btn {
      display: flex;
      width: 100%;
      margin-right: 0;
    }
    .bit-grid {
      gap: 3px;
    }
    .bit-grid strong {
      font-size: 18px;
    }
    .bit-grid small {
      font-size: 8px;
    }
  }
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
      animation: none !important;
      transition: none !important;
    }
  }
  @media print {
    body {
      background: #fff !important;
      color: #111 !important;
      font-size: 11pt;
    }
    .site-header,
    .site-footer,
    .course-sidebar,
    .lesson-toc,
    .schema-controls,
    .header-actions,
    .btn,
    .copy-code,
    .toast,
    dialog,
    .mini-quiz,
    .lesson-navigation {
      display: none !important;
    }
    .wrap {
      width: 100%;
    }
    .course-layout {
      display: block;
    }
    .course-content p,
    figcaption,
    li {
      color: #222 !important;
    }
    .course-content h1 {
      font-size: 24pt !important;
    }
    .course-content section {
      break-inside: avoid;
      padding-top: 20px !important;
    }
    .schema-panel,
    .callout,
    .exercise-panel,
    .takeaways {
      background: white !important;
      border-color: #888 !important;
    }
    .schema-node rect {
      fill: #eee;
      stroke: #555;
    }
    .schema-node text,
    .schema-caption {
      fill: #111;
    }
    .schema-link {
      stroke: #555;
    }
    pre {
      color: #111 !important;
    }
    details:not([open]) > p,
    details:not([open]) > pre {
      display: block;
    }
    a {
      color: #111 !important;
      text-decoration: underline;
    }
  }
}