/* BigData shared design system. No network fonts or runtime dependencies. */
:root {
  --bg: #f5f5f7;
  --surface: #fff;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --blue: #0071e3;
  --blue-soft: #eaf3ff;
  --purple: #7856cc;
  --line: #e4e4e9;
  --sidebar: 258px;
  --header: 68px;
  --radius: 22px;
  --shadow: 0 8px 28px #1d1d1f05;
  --font:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 95px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: -0.025em;
  word-break: keep-all;
  overflow-wrap: break-word;
}
button,
input,
select {
  font: inherit;
}
button,
a,
input,
select {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
}
a {
  color: var(--blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
summary:focus-visible,
select:focus-visible {
  outline: 3px solid #0071e3;
  outline-offset: 4px;
}
button {
  color: inherit;
}
h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}
h1,
h2,
h3,
h4 {
  line-height: 1.35;
  letter-spacing: -0.055em;
}
p {
  margin-bottom: 16px;
}
h1 {
  font-size: 48px;
  font-weight: 750;
}
h2 {
  font-size: 30px;
  font-weight: 720;
}
h3 {
  font-size: 19px;
  font-weight: 700;
}
h4 {
  font-size: 16px;
}
strong {
  font-weight: 680;
}
img {
  max-width: 100%;
  height: auto;
}
button svg,
svg.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}
button:disabled {
  cursor: default;
  opacity: 0.42;
}
button:hover:not(:disabled) {
  filter: brightness(0.97);
}
[hidden] {
  display: none !important;
}
.muted {
  color: var(--muted);
}
.lead {
  font-size: 18px;
  line-height: 1.9;
}
.skip-link {
  position: fixed;
  top: -70px;
  left: 20px;
  z-index: 100;
  background: var(--ink);
  color: white;
  padding: 12px 20px;
  border-radius: 10px;
}
.skip-link:focus {
  top: 10px;
}
.site-header {
  height: var(--header);
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  border-bottom: 1px solid #dddde580;
  background: #fafafce8;
  backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  padding: 0 28px;
  gap: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 21px;
  letter-spacing: -0.055em;
  font-weight: 750;
  white-space: nowrap;
}
.brand:hover {
  text-decoration: none;
}
.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: white;
  border-radius: 9px;
  width: 30px;
  height: 30px;
  font-size: 16px;
  letter-spacing: -0.12em;
  padding-right: 2px;
}
.brand-divider {
  height: 19px;
  width: 1px;
  background: #d8d8df;
  margin: 0 7px;
}
.header-subtitle {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.015em;
}
.header-actions {
  margin-left: auto;
  display: flex;
  gap: 14px;
  align-items: center;
}
.header-course {
  font-size: 12px;
  color: var(--muted);
}
.icon-button {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  border-radius: 9px;
  flex-shrink: 0;
}
.icon-button:hover {
  background: #e9e9ee;
}
.search-button {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 12px;
  background: #eeeef2;
  border: 1px solid #e6e6ec;
  border-radius: 9px;
  color: var(--muted);
  font-size: 12px;
}
.search-button kbd {
  font: 10px var(--font);
  padding: 0 4px;
  border: 1px solid #d8d8df;
  border-radius: 3px;
  background: #f8f8fa;
  margin-left: 16px;
}
.sidebar {
  position: fixed;
  top: var(--header);
  bottom: 0;
  left: 0;
  z-index: 35;
  width: var(--sidebar);
  border-right: 1px solid var(--line);
  background: #f8f8fa;
  display: flex;
  flex-direction: column;
  padding: 29px 18px 20px;
  transition: transform 0.24s ease;
  overflow-y: auto;
}
.sidebar-label {
  font-size: 10px;
  font-weight: 700;
  color: #88888f;
  letter-spacing: 0.12em;
  margin: 0 13px 13px;
}
.sidebar-home {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 13px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 26px;
}
.sidebar-home.active {
  color: var(--blue);
  background: #e8effa;
  font-weight: 650;
}
.sidebar-home svg {
  width: 17px;
  height: 17px;
}
.chapter-nav {
  display: block;
  color: var(--ink);
  padding: 12px 13px;
  border-radius: 10px;
  margin-bottom: 3px;
  font-size: 12px;
  font-weight: 650;
}
.chapter-nav small {
  display: block;
  font-size: 10px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  margin-bottom: 3px;
}
.chapter-nav.active {
  background: white;
  box-shadow: 0 2px 10px #00000004;
}
.chapter-nav.active small {
  color: var(--blue);
}
.chapter-nav:hover,
.toc-link:hover,
.sidebar-home:hover {
  text-decoration: none;
  background: #eeeef3;
}
.toc {
  margin: 9px 0 16px 24px;
  padding-left: 13px;
  border-left: 1px solid #dddde5;
}
.toc-link {
  display: block;
  border-radius: 6px;
  padding: 7px 8px;
  font-size: 11px;
  color: var(--muted);
  line-height: 1.65;
}
.toc-link.active {
  color: var(--blue);
  font-weight: 650;
}
.sidebar-bottom {
  margin-top: auto;
  padding: 32px 13px 0;
}
.sidebar-progress-label {
  font-size: 11px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  color: var(--muted);
  margin-bottom: 8px;
}
.progress-track {
  height: 4px;
  background: #e4e4eb;
  border-radius: 8px;
  overflow: hidden;
}
.progress-track span {
  display: block;
  background: var(--blue);
  height: 100%;
  width: 0;
  transition: width 0.25s;
}
.sidebar-hint {
  font-size: 10px;
  line-height: 1.8;
  color: #89898e;
  margin: 10px 0;
}
.sidebar-sources {
  display: block;
  margin-top: 18px;
  font-size: 11px;
  color: var(--muted);
}
.main-content {
  margin: var(--header) 0 0 var(--sidebar);
  padding: 44px clamp(28px, 5vw, 84px) 0;
  max-width: 1600px;
  transition: margin-left 0.24s;
}
.sidebar-collapsed .sidebar {
  transform: translateX(-100%);
}
.sidebar-collapsed .main-content {
  margin-left: 0;
}
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: var(--header) 0 0;
  z-index: 30;
  background: #1d1d1f40;
  backdrop-filter: blur(3px);
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 0.13em;
  font-weight: 650;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}
.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}
.home-hero {
  display: grid;
  grid-template-columns: 1.22fr 1fr;
  align-items: center;
  min-height: 420px;
  gap: 20px;
  position: relative;
  padding: 30px 0 40px;
}
.home-hero h1 {
  font-size: clamp(37px, 3.5vw, 57px);
  line-height: 1.28;
  margin-bottom: 22px;
}
.gradient-text {
  background: linear-gradient(110deg, #0573e1 10%, #535cde 80%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}
.hero-description {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.95;
  letter-spacing: -0.025em;
  margin-bottom: 25px;
}
.hero-actions {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}
.button {
  border: 1px solid transparent;
  background: var(--blue);
  color: white;
  border-radius: 50px;
  padding: 11px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  font-size: 12px;
  font-weight: 550;
  line-height: 1.65;
  transition:
    background 0.18s,
    transform 0.18s;
}
.button:hover {
  text-decoration: none;
  background: #0066cc;
  transform: translateY(-1px);
}
.button.secondary {
  background: white;
  color: var(--ink);
  border-color: var(--line);
}
.text-link {
  font-size: 12px;
  display: inline-flex;
  gap: 12px;
  align-items: center;
}
.hero-caption {
  margin-top: 16px;
  font-size: 10px;
  color: #939399;
}
.hero-art {
  height: 320px;
  position: relative;
  isolation: isolate;
  min-width: 0;
}
.hero-art:before {
  content: '';
  position: absolute;
  inset: 5% -5%;
  background: radial-gradient(ellipse, #c1d3ff64, transparent 68%);
  z-index: -1;
}
.art-orbit {
  border: 1px solid #bbc9e245;
  position: absolute;
  width: 300px;
  height: 215px;
  border-radius: 50%;
  top: 49px;
  left: 50%;
  transform: translateX(-50%) rotate(-25deg);
}
.orbit-two {
  width: 230px;
  height: 290px;
  top: 10px;
  transform: translateX(-50%) rotate(50deg);
}
.data-stack {
  width: 190px;
  height: 190px;
  position: absolute;
  top: 66px;
  left: 50%;
  transform: translateX(-50%) rotate(-10deg);
}
.stack-disc {
  position: absolute;
  width: 178px;
  height: 95px;
  border-radius: 50%;
  background: linear-gradient(160deg, #fafcff 0%, #d7e2ff 30%, #7098e8 75%, #b1c6fc);
  box-shadow:
    0 15px 0 #7799e6,
    0 18px 1px #d3defb,
    0 22px 30px #5161a527;
  border: 1px solid #ffffffac;
}
.disc-top {
  z-index: 3;
  top: 0;
  background: linear-gradient(160deg, #ffffff 0%, #e2eaff 45%, #a9bff0);
  display: flex;
  align-items: center;
  justify-content: center;
}
.disc-middle {
  z-index: 2;
  top: 41px;
}
.disc-bottom {
  z-index: 1;
  top: 82px;
}
.stack-symbol {
  font-size: 55px;
  font-weight: 200;
  line-height: 1;
  color: #637cc0;
  transform: scaleY(0.62);
  text-shadow: 0 1px #fff;
}
.stack-glow {
  position: absolute;
  bottom: -12px;
  left: 10px;
  width: 170px;
  height: 45px;
  background: #677fca30;
  filter: blur(22px);
  z-index: 0;
  border-radius: 50%;
}
.floating-label {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 15px;
  border: 1px solid #ffffffc7;
  background: #ffffffdf;
  border-radius: 13px;
  box-shadow: 0 10px 25px #334f8410;
  z-index: 5;
  backdrop-filter: blur(8px);
  transform: rotate(-4deg);
}
.art-input {
  left: 0;
  top: 37px;
}
.art-output {
  right: -4px;
  bottom: 61px;
  transform: rotate(4deg);
}
.floating-label small {
  display: block;
  font-size: 8px;
  letter-spacing: 0.09em;
  color: #8b8b95;
  line-height: 1.3;
}
.floating-label strong {
  display: block;
  font-size: 11px;
  margin-top: 2px;
}
.mini-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #eaf1ff;
  color: #4e77ca;
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mini-icon.green {
  background: #e6f5f0;
  color: #209f78;
}
.art-caption {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  white-space: nowrap;
  color: #8b8b98;
  display: flex;
  align-items: center;
  gap: 12px;
}
.art-caption i {
  font-style: normal;
  color: #a1a9b9;
}
.art-caption span {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #839ed4;
}
.course-overview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 23px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 57px;
}
.course-overview > div {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  border-right: 1px solid var(--line);
}
.course-overview > div:first-child {
  justify-content: flex-start;
}
.course-overview > div:last-child {
  border: 0;
}
.course-overview strong {
  font-size: 25px;
  font-weight: 650;
  letter-spacing: -0.05em;
}
.course-overview span {
  color: var(--muted);
  font-size: 10px;
}
.course-overview .overview-word {
  font-size: 17px;
}
.section-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: space-between;
  margin-bottom: 23px;
}
.section-heading .eyebrow {
  margin-bottom: 9px;
  font-size: 9px;
}
.section-heading h2 {
  margin-bottom: 0;
}
.section-aside {
  font-size: 11px;
  color: var(--muted);
}
.home-section {
  margin-bottom: 53px;
}
.home-section h2 {
  font-size: 25px;
}
.chapter-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.chapter-card {
  border: 1px solid #e9e9ee;
  background: white;
  border-radius: var(--radius);
  padding: 23px 26px 21px;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  min-width: 0;
}
.chapter-card:hover {
  text-decoration: none;
  transform: translateY(-4px);
  box-shadow: 0 15px 35px #2934500c;
}
.chapter-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.chapter-tag {
  font-size: 9px;
  letter-spacing: 0.08em;
  background: #edf4ff;
  color: #417ccb;
  border-radius: 5px;
  padding: 3px 8px;
  font-weight: 650;
}
.chapter-tag.purple {
  background: #f2eefe;
  color: #8970ba;
}
.card-arrow {
  border: 1px solid var(--line);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: #76767b;
}
.chapter-illustration {
  height: 145px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 7px 0 10px;
}
.pipeline-mini {
  gap: 10px;
  background: radial-gradient(ellipse, #f0f6ff, transparent 65%);
}
.pipeline-mini span {
  font-size: 11px;
  padding: 14px 18px;
  border-radius: 12px;
  background: linear-gradient(150deg, white, #eff5ff);
  border: 1px solid #dce7f9;
  box-shadow: 0 7px 0 #e4ecfa;
  color: #547ba9;
}
.pipeline-mini span:nth-of-type(2) {
  background: linear-gradient(130deg, #7aa8f2, #427ae2);
  color: white;
  border-color: #6495e7;
  box-shadow: 0 7px 0 #c4d6f9;
}
.pipeline-mini i {
  font-style: normal;
  color: #a8b8cf;
}
.cluster-mini {
  flex-direction: column;
  gap: 24px;
  background: radial-gradient(ellipse, #f5f0ff, transparent 67%);
}
.mini-master {
  font-size: 11px;
  border: 1px solid #dcd0f3;
  background: #f6f1ff;
  border-radius: 9px;
  padding: 7px 30px;
  color: #8b6baf;
  position: relative;
}
.mini-master:after {
  content: '';
  height: 24px;
  border-left: 1px solid #d7cce7;
  position: absolute;
  top: 100%;
  left: 50%;
}
.mini-workers {
  display: flex;
  gap: 18px;
  position: relative;
}
.mini-workers:before {
  content: '';
  position: absolute;
  width: calc(50% + 9px);
  height: 12px;
  border: 1px solid #d7cce7;
  border-bottom: 0;
  left: 25%;
  top: -12px;
}
.mini-workers span {
  font-size: 9px;
  border: 1px solid #e3daf3;
  border-radius: 8px;
  padding: 7px 17px;
  background: #faf7ff;
  color: #8b769d;
  box-shadow: 0 4px 0 #ece4f7;
}
.card-kicker {
  font-size: 10px;
  color: #8b8b92;
  margin-bottom: 6px;
}
.chapter-card h3 {
  font-size: 21px;
  margin-bottom: 12px;
}
.chapter-card-content > p:not(.card-kicker) {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.9;
}
.chapter-card-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 9px;
  color: #8c8c94;
  border-top: 1px solid #ededf1;
  padding-top: 16px;
  margin-top: 23px;
}
.chapter-progress {
  height: 3px;
  background: #f0f0f4;
  border-radius: 4px;
  margin-top: 17px;
  overflow: hidden;
}
.chapter-progress span {
  display: block;
  height: 100%;
  background: var(--blue);
  width: 0;
}
.progress-caption {
  font-size: 9px;
  color: #919199;
  display: block;
  margin-top: 6px;
}
.roadmap-note {
  font-size: 10px;
  margin-top: 16px;
}
.feature-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 35px;
}
.feature-row article {
  padding: 7px 0;
}
.feature-icon {
  width: 37px;
  height: 37px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 11px;
  font-size: 16px;
  margin-bottom: 18px;
  letter-spacing: -0.05em;
}
.blue {
  color: #327ece;
  background: #e8f0fc;
}
.purple {
  color: #8067b5;
  background: #eee9f8;
}
.green {
  color: #278969;
  background: #e2f1eb;
}
.feature-row h3 {
  font-size: 15px;
  margin-bottom: 10px;
}
.feature-row p {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.9;
}
.materials-banner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 35px;
  background: #ededf2;
  border: 1px solid #e4e4eb;
  border-radius: 18px;
  padding: 28px 32px;
  align-items: center;
}
.materials-banner .eyebrow {
  font-size: 9px;
  margin-bottom: 10px;
}
.materials-banner h2 {
  font-size: 22px;
  margin-bottom: 10px;
}
.materials-banner p:not(.eyebrow) {
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 0;
}
.material-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.material-links a {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  color: #51515b;
  font-size: 11px;
  padding: 8px 0;
  border-bottom: 1px solid #dbdbe4;
}
.material-links a:last-child {
  border-bottom: 0;
}
.material-links span {
  font-size: 9px;
  color: #8b8b96;
}
.page-footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 28px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  font-size: 10px;
  color: #95959c;
}
/* Reusable lesson components */
.chapter-hero {
  padding: 24px 0 37px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 42px;
}
.chapter-hero h1 {
  max-width: 830px;
  margin-bottom: 20px;
}
.chapter-hero .hero-description {
  font-size: 18px;
  max-width: 780px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
}
.hero-meta span,
.hero-meta a {
  padding: 5px 11px;
  background: #eaeaf0;
  border-radius: 6px;
}
.lesson-section {
  scroll-margin-top: 95px;
  min-width: 0;
}
.main-content:not(.home-main) > .lesson-section {
  margin-bottom: 64px;
  max-width: 1060px;
}
.section-number {
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 35px;
  height: 35px;
  border-radius: 10px;
  background: #e9eef8;
  color: #517eb3;
  flex-shrink: 0;
}
.lesson-section > .section-heading:has(.section-number) {
  justify-content: flex-start;
}
.source-note {
  color: #898990;
  font-size: 11px;
  margin: 8px 0 23px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 22px 0;
}
.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.card {
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 17px;
  background: white;
  min-width: 0;
  box-shadow: var(--shadow);
}
.card p:last-child {
  margin-bottom: 0;
}
.card h3 {
  margin-bottom: 12px;
}
.card p,
.card li {
  font-size: 14px;
}
.callout,
.analogy {
  border: 1px solid #dce7f6;
  border-radius: 15px;
  background: #edf4ff;
  padding: 21px 25px;
  margin: 24px 0;
  color: #34506d;
}
.callout p:last-child,
.analogy p:last-child {
  margin-bottom: 0;
}
.callout h3,
.analogy h3 {
  font-size: 16px;
}
.callout.tip {
  background: #edf7f2;
  border-color: #d6e9df;
  color: #315b48;
}
.callout.warning {
  background: #fff6e7;
  border-color: #f0e1c8;
  color: #725630;
}
.analogy {
  background: #f0edf8;
  border-color: #e4dff0;
  color: #645277;
}
.analogy:before {
  content: '이해를 돕는 비유';
  display: block;
  font-size: 10px;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
  font-weight: 650;
}
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 15px;
  margin: 24px 0;
  background: white;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 13px;
}
th,
td {
  text-align: left;
  vertical-align: top;
  padding: 15px 18px;
  border-bottom: 1px solid #ededf1;
}
th {
  background: #f0f1f5;
  font-size: 12px;
  font-weight: 650;
}
tr:last-child td {
  border-bottom: 0;
}
td code,
th code {
  white-space: normal;
}
code {
  font-family: 'Cascadia Code', Consolas, monospace;
  font-size: 0.88em;
  letter-spacing: 0;
  background: #e8eaf0;
  padding: 2px 5px;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
pre {
  position: relative;
  margin: 20px 0 24px;
  padding: 46px 22px 22px;
  border: 1px solid #323642;
  border-radius: 15px;
  background: #20242e;
  color: #e1e8f5;
  overflow-x: auto;
  line-height: 1.85;
  font-size: 13px;
  word-break: normal;
  tab-size: 2;
  white-space: pre;
}
pre code {
  background: none;
  border-radius: 0;
  padding: 0;
  font-size: inherit;
  color: inherit;
  overflow-wrap: normal;
  white-space: pre;
  display: block;
  min-width: max-content;
}
.copy-button {
  position: absolute;
  right: 12px;
  top: 9px;
  background: #ffffff0b;
  border: 1px solid #ffffff1c;
  color: #b6c1d6;
  border-radius: 6px;
  font-size: 10px;
  padding: 3px 10px;
}
.code-label {
  position: absolute;
  top: 12px;
  left: 20px;
  font-size: 9px;
  color: #8c9ab5;
  letter-spacing: 0.06em;
}
.steps {
  padding-left: 26px;
  counter-reset: steps;
}
.steps > .step,
.steps > li {
  padding: 0 0 18px 8px;
}
.step {
  margin: 26px 0;
}
.step h3 {
  font-size: 19px;
}
li {
  margin-bottom: 7px;
}
ul,
ol {
  padding-left: 24px;
}
.checklist {
  list-style: none;
  padding: 0;
}
.checklist li {
  padding: 9px 0 9px 28px;
  position: relative;
}
.checklist li:before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #247d60;
}
.completion {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  margin: 28px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  cursor: pointer;
  width: fit-content;
}
.completion input {
  accent-color: var(--blue);
  width: 17px;
  height: 17px;
  cursor: pointer;
}
.completion:has(input:checked) {
  color: var(--blue);
}
details {
  background: white;
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 17px 21px;
  margin: 15px 0;
}
summary {
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
}
details[open] > summary {
  margin-bottom: 17px;
}
details p {
  font-size: 14px;
}
details > pre:last-child {
  margin-bottom: 0;
}
.quiz {
  margin: 24px 0;
  padding: 25px;
  border: 1px solid #dce4f0;
  background: #fff;
  border-radius: 17px;
}
.quiz:before {
  content: 'CHECK YOUR UNDERSTANDING';
  display: block;
  font-size: 9px;
  color: #6485b4;
  letter-spacing: 0.1em;
  margin-bottom: 13px;
}
.quiz h3 {
  font-size: 17px;
}
.quiz-options {
  display: grid;
  gap: 9px;
}
.quiz-options button {
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 11px 15px;
  background: #f9f9fb;
  font-size: 13px;
  line-height: 1.8;
}
.quiz-options button.correct {
  border-color: #73b394;
  background: #eaf6ef;
  color: #256447;
}
.quiz-options button.incorrect {
  border-color: #d59b92;
  background: #fff0ed;
  color: #a34534;
}
.quiz-feedback {
  font-size: 13px;
  margin: 14px 0 0;
  min-height: 0;
}
.quiz-feedback:empty {
  display: none;
}
.chapter-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
}
.chapter-footer a {
  font-size: 13px;
}
.lesson-section figure {
  margin: 24px 0;
}
.lesson-section figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 10px;
}
/* Interactive concept illustrations */
.visual {
  background: linear-gradient(135deg, #ffffff, #f0f4fb);
  border: 1px solid #dfe5f0;
  border-radius: 20px;
  padding: 27px;
  margin: 25px 0;
  overflow: hidden;
}
.visual-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 20px;
}
.visual-header h3 {
  font-size: 17px;
  margin: 0;
}
.visual-badge {
  font-size: 9px;
  color: #7c879a;
  white-space: nowrap;
}
.visual-tabs {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.visual-tabs button {
  background: #fff;
  border: 1px solid #dbe1ec;
  border-radius: 9px;
  padding: 8px 13px;
  font-size: 12px;
  color: #68758b;
}
.visual-tabs button[aria-pressed='true'] {
  color: #006aca;
  border-color: #95bff0;
  background: #e7f1ff;
}
.visual-description {
  font-size: 14px;
  color: #56657d;
  background: #ffffffba;
  border-radius: 12px;
  padding: 17px 20px;
  margin: 20px 0 0;
  line-height: 1.9;
  min-height: 85px;
}
.flow-line {
  display: flex;
  gap: 10px;
  align-items: stretch;
  justify-content: center;
  flex-wrap: wrap;
}
.flow-node {
  flex: 1;
  min-width: 105px;
  padding: 20px 12px;
  text-align: center;
  border: 1px solid #dce3ef;
  border-radius: 13px;
  background: white;
  color: #78849a;
  transition:
    background 0.2s,
    border-color 0.2s;
}
.flow-node strong {
  display: block;
  font-size: 16px;
}
.flow-node small {
  display: block;
  font-size: 10px;
  margin-top: 7px;
}
.flow-node.active {
  color: #1668b5;
  border-color: #80b1ea;
  background: #eaf3ff;
  box-shadow: 0 4px 12px #1878cf0a;
}
.flow-arrow {
  align-self: center;
  color: #a5b6cd;
  font-size: 20px;
}
.cluster-canvas {
  border: 1px dashed #ced7e7;
  border-radius: 15px;
  padding: 17px;
}
.cluster-boundary {
  font-size: 10px;
  color: #8793a5;
  text-align: center;
  margin-bottom: 17px;
}
.cluster-top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: center;
  max-width: 650px;
  margin: auto;
}
.cluster-node {
  border: 1px solid #d7dfed;
  background: #fff;
  border-radius: 12px;
  padding: 15px;
  text-align: center;
  font-size: 13px;
  transition: 0.2s;
}
.cluster-node strong {
  display: block;
}
.cluster-node small {
  display: block;
  font-size: 11px;
  color: #8c96a7;
  margin-top: 3px;
}
.cluster-node.active {
  background: #edf4ff;
  border-color: #81aae1;
  color: #3068af;
}
.cluster-connect {
  font-size: 10px;
  text-align: center;
  color: #8d9bb0;
  max-width: 90px;
}
.cluster-workers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  max-width: 650px;
  margin: 27px auto 0;
}
.executor {
  border-radius: 7px;
  background: #eae5f8;
  border: 1px solid #d4c9eb;
  color: #7e62a6;
  padding: 6px;
  font-size: 11px;
  margin-top: 10px;
}
.executor.waiting {
  background: #f4f4f7;
  border-style: dashed;
  color: #9398a4;
  border-color: #e0e0e8;
}
.port-route {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 15px;
  align-items: center;
}
.port-route .flow-node {
  padding: 20px 13px;
}
.port-route code {
  font-size: 12px;
  display: inline-block;
  margin-top: 9px;
}
.port-bridge {
  font-size: 10px;
  text-align: center;
  color: #8d9bb0;
}
.partition-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.partition-block {
  background: #fff;
  border: 1px solid #d8e2f1;
  border-radius: 12px;
  padding: 18px 10px;
  text-align: center;
}
.partition-block small {
  font-size: 9px;
  color: #8c98aa;
}
.partition-block strong {
  display: block;
  font-size: 19px;
  margin: 9px 0;
  color: #5479ae;
}
.partition-result {
  font-size: 12px;
  color: #77899f;
}
.sum-result {
  font-size: 27px;
  font-weight: 700;
  text-align: center;
  color: var(--blue);
  margin-top: 20px;
}
.sum-result small {
  font-size: 12px;
  font-weight: 400;
  display: block;
  color: #7f8b9f;
}
.visual-controls {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 18px;
  align-items: center;
}
.visual-controls > span {
  font-size: 11px;
  color: var(--muted);
}
/* Search and status */
.search-dialog {
  border: 1px solid #dddde7;
  padding: 0;
  border-radius: 19px;
  background: #fbfbfd;
  max-width: 620px;
  width: calc(100% - 32px);
  max-height: 76vh;
  box-shadow: 0 25px 100px #10182733;
  margin: 14vh auto auto;
  overflow: hidden;
}
.search-dialog::backdrop {
  background: #1b233f45;
  backdrop-filter: blur(5px);
}
.search-field {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 17px 20px;
  border-bottom: 1px solid var(--line);
}
.search-field input {
  border: 0;
  background: none;
  outline: none;
  flex: 1;
  min-width: 0;
  font-size: 16px;
  color: var(--ink);
}
.search-field input:focus-visible {
  outline: none;
}
.search-results {
  padding: 12px;
  overflow-y: auto;
  max-height: 55vh;
}
.search-result {
  display: block;
  padding: 13px 15px;
  border-radius: 10px;
  color: var(--ink);
}
.search-result:hover {
  background: #edf2fb;
  text-decoration: none;
}
.search-result small {
  font-size: 10px;
  color: #7e8da7;
  display: block;
}
.search-result strong {
  font-size: 14px;
}
.search-empty {
  padding: 15px;
  color: var(--muted);
  font-size: 13px;
}
.search-shortcut-hint {
  font-size: 10px;
  color: var(--muted);
  padding: 12px 20px;
  border-top: 1px solid var(--line);
}
.toast {
  position: fixed;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%);
  background: #20252eee;
  color: #fff;
  padding: 11px 20px;
  border-radius: 12px;
  font-size: 12px;
  z-index: 90;
  box-shadow: 0 8px 30px #0002;
  max-width: 90vw;
  text-align: center;
}
.back-to-top {
  position: fixed;
  right: 25px;
  bottom: 24px;
  background: #ffffffec;
  border: 1px solid var(--line);
  border-radius: 50%;
  box-shadow: 0 4px 20px #00000008;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #888;
  z-index: 20;
}
/* Meaningful color accents: planning / processing / data / checks. */
:root {
  --accent-blue: #1663ac;
  --accent-purple: #7450b4;
  --accent-teal: #18755e;
  --accent-amber: #965c14;
  --tint-blue: #e8f2ff;
  --tint-purple: #f0e9fc;
  --tint-teal: #e6f5ed;
  --tint-amber: #fff1d9;
}
.term {
  padding: 1px 5px;
  border-radius: 5px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  font-weight: 650;
}
.term-blue {
  color: var(--accent-blue);
  background: var(--tint-blue);
}
.term-purple {
  color: var(--accent-purple);
  background: var(--tint-purple);
}
.term-teal {
  color: var(--accent-teal);
  background: var(--tint-teal);
}
.term-amber {
  color: var(--accent-amber);
  background: var(--tint-amber);
}
.chapter-hero h1 .title-blue {
  color: var(--blue);
}
.chapter-hero h1 .title-purple {
  color: var(--accent-purple);
}
.card-grid .card {
  position: relative;
  border-top: 3px solid #c0d9f8;
}
.card-grid .card:nth-child(4n + 2) {
  border-top-color: #d6c3f0;
}
.card-grid .card:nth-child(4n + 3) {
  border-top-color: #afd9c5;
}
.card-grid .card:nth-child(4n + 4) {
  border-top-color: #efd09e;
}
.card-grid .card h3 {
  color: var(--accent-blue);
}
.card-grid .card:nth-child(4n + 2) h3 {
  color: var(--accent-purple);
}
.card-grid .card:nth-child(4n + 3) h3 {
  color: var(--accent-teal);
}
.card-grid .card:nth-child(4n + 4) h3 {
  color: var(--accent-amber);
}
.lesson-section:nth-of-type(4n + 2) .section-number {
  background: var(--tint-purple);
  color: var(--accent-purple);
}
.lesson-section:nth-of-type(4n + 3) .section-number {
  background: var(--tint-teal);
  color: var(--accent-teal);
}
.lesson-section:nth-of-type(4n + 4) .section-number {
  background: var(--tint-amber);
  color: var(--accent-amber);
}
.callout {
  border-left: 3px solid #8cb8ec;
}
.callout.tip {
  border-left-color: #64af8b;
}
.callout.warning {
  border-left-color: #dba546;
}
.callout > strong {
  display: block;
  margin-bottom: 8px;
}
.callout.tip > strong:before {
  content: '✓ ';
  font-weight: 750;
}
.callout.warning > strong:before {
  content: '! ';
  font-weight: 750;
}
.quiz:before {
  color: var(--accent-teal);
}
.quiz {
  border-top: 3px solid #a8d4bf;
}
.quiz-feedback {
  border-radius: 9px;
  background: #f1f5fa;
  padding: 13px 15px;
  color: #495d76;
}
.syntax-string {
  color: #a6dec1;
}
.syntax-option {
  color: #91c8f4;
}
.syntax-keyword {
  color: #d4b6f4;
}
.syntax-number {
  color: #f0cc8a;
}
.syntax-comment {
  color: #99a6bd;
}
.syntax-success {
  color: #99e0b7;
  font-weight: 650;
}
[data-visual='pipeline'] .flow-node:nth-of-type(1) {
  border-color: #c1d8f3;
  color: var(--accent-blue);
}
[data-visual='pipeline'] .flow-node:nth-of-type(2) {
  border-color: #d9c7ef;
  color: var(--accent-purple);
}
[data-visual='pipeline'] .flow-node:nth-of-type(3) {
  border-color: #baddce;
  color: var(--accent-teal);
}
[data-visual='pipeline'] .flow-node:nth-of-type(4) {
  border-color: #ebd2ad;
  color: var(--accent-amber);
}
[data-visual='pipeline'] .flow-node.active:nth-of-type(1) {
  background: var(--tint-blue);
}
[data-visual='pipeline'] .flow-node.active:nth-of-type(2) {
  background: var(--tint-purple);
}
[data-visual='pipeline'] .flow-node.active:nth-of-type(3) {
  background: var(--tint-teal);
}
[data-visual='pipeline'] .flow-node.active:nth-of-type(4) {
  background: var(--tint-amber);
}
.cluster-top .cluster-node:first-child strong {
  color: var(--accent-blue);
}
.cluster-top .cluster-node:last-child strong {
  color: var(--accent-amber);
}
.cluster-top .cluster-node:last-child.active {
  background: var(--tint-amber);
  border-color: #dab982;
}
.cluster-workers .cluster-node strong {
  color: var(--accent-teal);
}
.cluster-workers .cluster-node.active {
  border-color: #9bccb7;
  background: #f0f8f4;
}
.executor:not(.waiting) {
  color: #654299;
  background: #eee6fa;
  border-color: #cdb7e6;
}
.cluster-node small {
  color: #69758a;
}
.cluster-flow {
  margin: 20px auto -8px;
  text-align: center;
  font-size: 11px;
  color: #596d87;
  max-width: 650px;
  padding: 9px;
  background: #ffffffc7;
  border-radius: 8px;
}
.cluster-flow span {
  display: inline-block;
  padding: 2px 5px;
  border-radius: 4px;
}
.partition-block:nth-child(1) {
  background: #f0f6ff;
  border-color: #c1d8f3;
}
.partition-block:nth-child(2) {
  background: #f7f2ff;
  border-color: #d9c7ef;
}
.partition-block:nth-child(3) {
  background: #f0f8f3;
  border-color: #baddce;
}
.partition-block:nth-child(4) {
  background: #fff8eb;
  border-color: #ebd2ad;
}
.partition-block:nth-child(2) strong {
  color: var(--accent-purple);
}
.partition-block:nth-child(3) strong {
  color: var(--accent-teal);
}
.partition-block:nth-child(4) strong {
  color: var(--accent-amber);
}
.partition-result {
  color: #5f6d82;
}
.sum-result {
  color: var(--accent-teal);
  background: #eaf6ef;
  border: 1px solid #cde6d6;
  border-radius: 12px;
  padding: 15px;
}
.sum-result small {
  color: #546f60;
}
.port-route .flow-node:last-child {
  border-color: #d8c6ec;
  background: #f7f3fd;
  color: var(--accent-purple);
}
.pipeline-mini span:last-child {
  background: #edf8f2;
  border-color: #c7e5d5;
  box-shadow: 0 7px 0 #dbede3;
  color: #3b8566;
}
.progress-track span {
  background: linear-gradient(90deg, #438eeb, #8e70d5);
}
.analogy:has(> strong):before {
  display: none;
}
.analogy > strong {
  display: block;
  font-size: 13px;
  margin-bottom: 9px;
}
.chapter-hero .hero-meta + p {
  margin-top: 20px;
}
caption {
  text-align: left;
  padding: 12px 18px;
  font-size: 11px;
  color: var(--muted);
  background: #fafafd;
  border-bottom: 1px solid var(--line);
}
.main-content:not(.home-main) .card + .card {
  margin-top: 18px;
}
.toc-link {
  font-size: 12px;
}
.sidebar-label {
  color: #707079;
}
.visual-badge,
.cluster-boundary,
.cluster-connect,
.port-bridge {
  color: #64738b;
}
.hero-caption,
.roadmap-note,
.progress-caption {
  color: #72727c;
}
.flow-node small,
.partition-block small {
  color: #68758b;
}
@media (max-width: 760px) {
  .cluster-flow {
    font-size: 10px;
  }
  .chapter-hero h1 {
    line-height: 1.4;
  }
  .quiz-options button {
    padding: 13px 14px;
  }
  .visual-tabs button {
    min-height: 36px;
  }
  .flow-line {
    grid-template-columns: 1fr;
  }
  .flow-line .flow-arrow {
    justify-self: center;
    line-height: 1;
    transform: rotate(90deg);
  }
  .flow-line .flow-node {
    padding: 12px;
  }
  .flow-line .flow-node small {
    margin-top: 3px;
  }
}
@media (min-width: 1800px) {
  .main-content {
    margin-right: auto;
    margin-left: max(var(--sidebar), calc((100vw - 1350px) / 2));
    max-width: 1350px;
  }
}
@media (max-width: 1200px) {
  :root {
    --sidebar: 225px;
  }
  .site-header {
    padding: 0 20px;
  }
  .main-content {
    padding-right: 32px;
    padding-left: 32px;
  }
  .home-hero {
    gap: 5px;
  }
  .home-hero h1 {
    font-size: 38px;
  }
  .hero-art {
    transform: scale(0.92);
  }
  .hero-actions {
    gap: 13px;
  }
  .hero-actions .button {
    font-size: 11px;
    padding: 10px 16px;
  }
  .text-link {
    font-size: 11px;
  }
  .course-overview > div {
    gap: 7px;
  }
  .course-overview strong {
    font-size: 22px;
  }
  .course-overview .overview-word {
    font-size: 15px;
  }
  .course-overview span {
    font-size: 9px;
  }
  .chapter-card {
    padding: 20px;
  }
  .chapter-card h3 {
    font-size: 19px;
  }
  .card-grid.three {
    grid-template-columns: 1fr 1fr;
  }
  .header-course {
    display: none;
  }
  .chapter-card-meta {
    font-size: 8px;
  }
}
@media (max-width: 1000px) {
  .home-hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-top: 22px;
  }
  .hero-art {
    display: none;
  }
  .home-hero h1 {
    font-size: 46px;
  }
  .home-hero .hero-description br.desktop-break {
    display: none;
  }
  .course-overview {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 15px;
  }
  .course-overview > div:nth-child(2) {
    border: 0;
  }
  .course-overview > div:nth-child(3) {
    justify-content: flex-start;
  }
  .chapter-card-meta {
    flex-direction: column;
    gap: 3px;
  }
  .section-aside {
    display: none;
  }
  .feature-row {
    gap: 20px;
  }
  .materials-banner {
    grid-template-columns: 1fr;
    gap: 15px;
  }
  .chapter-hero h1 {
    font-size: 39px;
  }
  .card-grid.three {
    grid-template-columns: 1fr;
  }
  .partition-grid {
    grid-template-columns: 1fr 1fr;
  }
  .pipeline-mini {
    gap: 5px;
  }
  .pipeline-mini span {
    padding: 12px;
  }
  .flow-node {
    min-width: 90px;
  }
}
@media (max-width: 1024px) {
  :root {
    --sidebar: 278px;
  }
  .sidebar {
    transform: translateX(-100%);
    background: #fafafc;
    padding-top: 22px;
  }
  .main-content,
  .sidebar-collapsed .main-content {
    margin-left: 0;
  }
  .sidebar-mobile-open .sidebar {
    transform: translateX(0);
  }
  .sidebar-mobile-open .sidebar-overlay {
    display: block;
  }
  .sidebar-mobile-open {
    overflow: hidden;
  }
}
@media (max-width: 760px) {
  :root {
    --header: 60px;
  }
  .site-header {
    padding: 0 15px;
    gap: 9px;
  }
  .brand {
    font-size: 19px;
  }
  .brand-mark {
    width: 27px;
    height: 27px;
    font-size: 14px;
  }
  .header-subtitle,
  .brand-divider {
    display: none;
  }
  .header-actions {
    gap: 3px;
  }
  .search-button {
    background: none;
    border: 0;
    padding: 8px;
  }
  .search-button span,
  .search-button kbd {
    display: none;
  }
  .main-content,
  .sidebar-collapsed .main-content {
    padding: 27px 22px 0;
  }
  .home-hero {
    padding: 26px 0 25px;
  }
  .home-hero h1 {
    font-size: 43px;
  }
  .hero-description {
    font-size: 14px;
  }
  .hero-actions {
    gap: 19px;
  }
  .hero-actions .button {
    font-size: 12px;
  }
  .hero-caption {
    font-size: 9px;
  }
  .course-overview {
    margin-bottom: 37px;
    padding: 20px 0;
  }
  .course-overview strong {
    font-size: 23px;
  }
  .course-overview span {
    font-size: 10px;
  }
  .course-overview > div:nth-child(2n) {
    justify-content: flex-end;
  }
  .course-overview > div {
    border: 0;
  }
  .home-section h2 {
    font-size: 24px;
  }
  .chapter-cards {
    grid-template-columns: 1fr;
    gap: 19px;
  }
  .chapter-card {
    padding: 23px;
  }
  .chapter-illustration {
    height: 130px;
  }
  .chapter-card h3 {
    font-size: 22px;
  }
  .chapter-card-meta {
    flex-direction: row;
    font-size: 9px;
  }
  .chapter-card-content > p:not(.card-kicker) {
    font-size: 13px;
  }
  .feature-row {
    grid-template-columns: 1fr;
    gap: 19px;
  }
  .feature-row article {
    display: grid;
    grid-template-columns: 42px 1fr;
    column-gap: 14px;
    align-items: start;
  }
  .feature-icon {
    grid-row: 1/3;
    margin-bottom: 0;
  }
  .feature-row h3 {
    margin-bottom: 6px;
  }
  .feature-row p {
    grid-column: 2;
    margin-bottom: 0;
  }
  .materials-banner {
    padding: 25px;
  }
  .page-footer {
    flex-direction: column;
    gap: 6px;
    font-size: 9px;
  }
  .chapter-hero {
    padding-top: 18px;
    margin-bottom: 32px;
  }
  .chapter-hero h1 {
    font-size: 36px;
  }
  .chapter-hero .hero-description {
    font-size: 16px;
  }
  .section-heading {
    gap: 11px;
  }
  .section-heading h2 {
    font-size: 25px;
  }
  .main-content:not(.home-main) > .lesson-section {
    margin-bottom: 48px;
  }
  .card-grid,
  .card-grid.three {
    grid-template-columns: 1fr;
  }
  .card {
    padding: 21px;
  }
  .callout,
  .analogy {
    padding: 20px;
  }
  .lead {
    font-size: 16px;
  }
  th,
  td {
    padding: 12px 14px;
    min-width: 105px;
  }
  .table-wrap {
    font-size: 12px;
  }
  .quiz {
    padding: 20px;
  }
  .visual {
    padding: 20px 15px;
  }
  .visual-header {
    flex-wrap: wrap;
    gap: 5px;
  }
  .visual-header h3 {
    font-size: 16px;
  }
  .visual-tabs {
    gap: 5px;
  }
  .visual-tabs button {
    font-size: 11px;
    padding: 7px 10px;
  }
  .flow-line {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 7px;
  }
  .flow-line .flow-arrow:nth-of-type(4) {
    display: none;
  }
  .flow-node {
    min-width: 0;
    padding: 15px 10px;
  }
  .flow-node strong {
    font-size: 14px;
  }
  .visual-description {
    font-size: 13px;
    padding: 15px;
    min-height: 120px;
  }
  .cluster-top {
    gap: 7px;
    grid-template-columns: 1fr auto 1fr;
  }
  .cluster-node {
    padding: 12px 7px;
    font-size: 11px;
  }
  .cluster-node small {
    font-size: 9px;
  }
  .cluster-connect {
    font-size: 9px;
    max-width: 58px;
  }
  .cluster-workers {
    gap: 10px;
  }
  .cluster-boundary {
    font-size: 8px;
  }
  .executor {
    font-size: 10px;
    padding: 5px;
  }
  .port-route {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .port-route .flow-node {
    padding: 15px;
  }
  .port-bridge {
    font-size: 10px;
  }
  .chapter-footer {
    flex-wrap: wrap;
  }
  .chapter-footer .button {
    font-size: 11px;
  }
  .completion {
    font-size: 11px;
  }
  .back-to-top {
    right: 15px;
    bottom: 15px;
  }
  .search-dialog {
    margin-top: 80px;
  }
}
@media (max-width: 380px) {
  .home-hero h1 {
    font-size: 37px;
  }
  .main-content {
    padding-right: 17px;
    padding-left: 17px;
  }
  .chapter-hero h1 {
    font-size: 32px;
  }
  .chapter-card-meta {
    font-size: 8px;
  }
  .hero-actions {
    gap: 13px;
  }
  .course-overview span {
    font-size: 9px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *:before,
  *:after {
    transition: none !important;
    animation: none !important;
  }
  .button:hover,
  .chapter-card:hover {
    transform: none;
  }
}
@media print {
  body {
    background: white;
    color: #111;
    font-size: 11pt;
  }
  .site-header,
  .sidebar,
  .sidebar-overlay,
  .search-dialog,
  .copy-button,
  .back-to-top,
  .toast,
  .completion,
  .hero-actions,
  .visual-controls,
  .visual-tabs,
  .skip-link {
    display: none !important;
  }
  .main-content,
  .sidebar-collapsed .main-content {
    margin: 0;
    padding: 0;
    max-width: none;
  }
  .chapter-hero {
    padding-top: 0;
  }
  .chapter-hero h1 {
    font-size: 29pt;
  }
  h2 {
    font-size: 21pt;
  }
  h3 {
    font-size: 15pt;
  }
  .lesson-section {
    margin-bottom: 25pt !important;
  }
  .card,
  .callout,
  .analogy,
  .visual,
  .quiz {
    break-inside: avoid;
    box-shadow: none;
    background: white;
  }
  .table-wrap {
    overflow: visible;
  }
  pre {
    white-space: pre-wrap;
    overflow: visible;
    background: #f4f4f4;
    color: #111;
    padding: 12pt;
    break-inside: avoid;
  }
  pre code {
    white-space: pre-wrap;
    min-width: 0;
    overflow-wrap: anywhere;
  }
  .code-label {
    display: none;
  }
  a {
    color: inherit;
  }
  details {
    break-inside: avoid;
  }
  details > * {
    display: block !important;
  }
  .page-footer {
    font-size: 8pt;
  }
  .hero-art {
    display: none;
  }
  .home-hero {
    display: block;
  }
  .gradient-text {
    color: #333;
    background: none;
  }
  .search-results {
    display: none;
  }
}