:root {
  --ink: #0e1420;
  --ink-2: #2a3648;
  --muted: #64748b;
  --line: #dbe2ec;
  --paper: #f6f8fb;
  --card: #ffffff;
  --teal: #0d7a72;
  --teal-soft: #ddf6f0;
  --cyan: #0891b2;
  --amber: #b45309;
  --amber-soft: #fdf0db;
  --coral: #dc2626;
  --green: #15803d;
  --violet: #6d28d9;
  --shadow: 0 16px 44px rgba(14, 20, 32, .1);
  --radius: 12px;
  --font-display: "Space Grotesk", Inter, ui-sans-serif, system-ui, sans-serif;
  --font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(120deg, rgba(8, 145, 178, .08), transparent 34%),
    linear-gradient(300deg, rgba(245, 158, 11, .12), transparent 38%),
    var(--paper);
  font-family: var(--font-body);
  letter-spacing: 0;
}

h1,
h2,
h3,
.brand strong,
.route-hop strong {
  font-family: var(--font-display);
  letter-spacing: -.01em;
}

#app:focus {
  outline: none;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 20;
  background: var(--ink);
  color: white;
  padding: 10px 14px;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(216, 222, 232, .85);
  background: rgba(247, 249, 252, .88);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  width: 42px;
  height: 42px;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 1rem;
  line-height: 1.05;
}

.brand small {
  color: var(--muted);
  font-size: .78rem;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-nav a,
.nav-toggle,
.ghost-button,
.button,
.primary-link,
.back-link {
  min-height: 40px;
  border-radius: var(--radius);
}

.top-nav a {
  padding: 10px 12px;
  color: var(--ink-2);
  font-size: .92rem;
  text-decoration: none;
}

.top-nav a:hover {
  background: white;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: white;
  color: var(--ink);
  padding: 0 14px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, .8fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: center;
  padding: clamp(34px, 6vw, 72px) clamp(18px, 5vw, 72px) 22px;
  min-height: min(560px, calc(100vh - 190px));
}

.hero-copy {
  max-width: 780px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--teal);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hero h1,
.reference-hero h1 {
  margin: 16px 0 20px;
  font-size: clamp(2.4rem, 4.6vw, 4.4rem);
  line-height: 1.02;
  max-width: 880px;
}

.hero p,
.reference-hero p {
  margin: 0;
  max-width: 740px;
  color: var(--ink-2);
  font-size: clamp(1.05rem, 2vw, 1.32rem);
  line-height: 1.62;
}

.hero-actions,
.course-card-actions,
.lesson-controls,
.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.button,
.primary-link,
.back-link,
.ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  padding: 11px 18px;
  font-weight: 600;
  text-decoration: none;
  transition: background .15s ease, border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}

.button.primary:hover,
.primary-link:hover {
  background: var(--ink-2);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(14, 20, 32, .18);
}

.button.secondary:hover,
.ghost-button:hover,
.back-link:hover {
  border-color: var(--muted);
}

.button.primary,
.primary-link {
  background: var(--ink);
  color: white;
}

.button.secondary,
.ghost-button,
.back-link {
  background: white;
  color: var(--ink);
  border-color: var(--line);
}

.button:disabled {
  opacity: .5;
}

.primary-link svg,
.back-link svg,
.takeaway svg,
.signal-list svg,
.hero-actions svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.network-panel {
  position: relative;
  min-height: 380px;
  border: 1px solid rgba(16, 19, 24, .08);
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(16, 19, 24, .05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(16, 19, 24, .05) 1px, transparent 1px),
    radial-gradient(circle at 70% 20%, rgba(245, 158, 11, .18), transparent 34%),
    radial-gradient(circle at 18% 84%, rgba(34, 211, 238, .16), transparent 30%),
    #ffffff;
  background-size: 42px 42px, 42px 42px, auto, auto, auto;
  box-shadow: var(--shadow);
}

.network-panel svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.network-panel path {
  fill: none;
  stroke: rgba(16, 19, 24, .18);
  stroke-width: 8;
  stroke-linecap: round;
}

.network-panel .flow-ai {
  stroke: rgba(15, 118, 110, .32);
}

.network-panel .flow-dev {
  stroke: rgba(180, 83, 9, .32);
}

.network-panel .bucket-fill {
  stroke: rgba(109, 40, 217, .24);
  stroke-width: 14;
}

.node,
.packet,
.ops-bucket {
  position: absolute;
  z-index: 1;
}

.node {
  display: grid;
  place-items: center;
  width: 82px;
  height: 82px;
  border: 1px solid rgba(16, 19, 24, .14);
  border-radius: 50%;
  color: white;
  font-weight: 700;
  box-shadow: 0 16px 38px rgba(16, 19, 24, .16);
}

.node span {
  background: rgba(16, 19, 24, .22);
  border-radius: 999px;
  padding: 4px 8px;
}

.node.ai {
  left: 9%;
  top: 14%;
  background: var(--teal);
}

.node.dev {
  left: 9%;
  bottom: 16%;
  background: var(--amber);
}

.ops-bucket {
  right: 8%;
  bottom: 14%;
  display: grid;
  place-items: center;
  width: clamp(158px, 34%, 210px);
  min-height: 168px;
  border: 1px solid rgba(109, 40, 217, .24);
  border-radius: 8px 8px 24px 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .9), rgba(255, 255, 255, .7) 26%, rgba(109, 40, 217, .18) 27%, rgba(109, 40, 217, .26)),
    #ffffff;
  color: var(--ink);
  box-shadow: 0 18px 42px rgba(16, 19, 24, .16);
  text-align: center;
}

.ops-bucket::before {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  top: 42px;
  height: 9px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--green), var(--amber));
  animation: fillPulse 4s infinite ease-in-out;
}

.ops-bucket span {
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--violet);
  color: white;
  font-size: 1.15rem;
  font-weight: 700;
}

.ops-bucket small {
  color: var(--ink-2);
  font-size: .82rem;
  font-weight: 700;
  line-height: 1.35;
}

.packet {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: var(--ink);
  transform: rotate(45deg);
  animation: movePacket 7s infinite ease-in-out;
}

.packet-ai {
  left: 24%;
  top: 26%;
  background: var(--teal);
  animation: aiToOps 5.8s infinite ease-in-out;
}

.packet-dev {
  left: 24%;
  bottom: 27%;
  background: var(--amber);
  animation: devToOps 6.2s infinite ease-in-out;
  animation-delay: -2.4s;
}

.packet-spark {
  left: 79%;
  top: 34%;
  width: 14px;
  height: 14px;
  background: var(--green);
  animation: sparkOps 3.8s infinite ease-in-out;
}

@keyframes aiToOps {
  0%, 100% { transform: translate(0, 0) rotate(45deg); opacity: .25; }
  52% { transform: translate(170px, 78px) rotate(45deg); opacity: 1; }
  82% { transform: translate(246px, 126px) rotate(45deg); opacity: .75; }
}

@keyframes devToOps {
  0%, 100% { transform: translate(0, 0) rotate(45deg); opacity: .25; }
  50% { transform: translate(174px, -42px) rotate(45deg); opacity: 1; }
  82% { transform: translate(248px, -72px) rotate(45deg); opacity: .75; }
}

@keyframes sparkOps {
  0%, 100% { transform: scale(.8) rotate(45deg); opacity: .28; }
  45% { transform: scale(1.6) rotate(45deg); opacity: 1; }
}

@keyframes fillPulse {
  0%, 100% { transform: scaleX(.58); transform-origin: left; opacity: .65; }
  55% { transform: scaleX(1); transform-origin: left; opacity: 1; }
}

.section-shell {
  padding: 38px clamp(18px, 5vw, 72px);
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 20px;
}

.section-heading h2,
.plain-panel h2,
.reference-grid h2 {
  margin: 8px 0 0;
  font-size: clamp(1.5rem, 3vw, 2.35rem);
  line-height: 1.06;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.course-card,
.plain-panel,
.term-card,
.lesson-card,
.prompt-panel,
.checklist-panel,
.quiz,
.signal-list {
  border: 1px solid rgba(16, 19, 24, .09);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .92);
  box-shadow: 0 12px 35px rgba(16, 19, 24, .07);
}

.course-card {
  display: flex;
  min-height: 290px;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  padding: clamp(24px, 3vw, 36px);
  position: relative;
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease;
}

.course-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 50px rgba(14, 20, 32, .13);
}

.course-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 8px;
  background: var(--teal);
}

.course-card.amber::before {
  background: var(--amber);
}

.course-card-top,
.progress-meta,
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  color: var(--muted);
  font-size: .86rem;
}

.pill {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border-radius: 999px;
  background: #edf2f7;
  color: var(--ink-2);
  padding: 3px 10px;
  font-weight: 600;
}

.course-card h2 {
  margin: 18px 0 8px;
  font-size: clamp(1.7rem, 2.8vw, 2.4rem);
  line-height: 1.05;
}

.course-card p,
.plain-panel p,
.term-card p,
.lesson-card p,
.takeaway p,
.quiz p,
.signal-list li,
.source-list li,
.compact-list li {
  color: var(--ink-2);
  line-height: 1.58;
}

.progress-line {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7ebf1;
}

.progress-line span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--green), var(--amber));
}

.split,
.reference-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.plain-panel {
  padding: clamp(22px, 3vw, 34px);
}

.course-layout {
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: 22px;
  padding: 24px clamp(18px, 4vw, 56px) 52px;
  min-height: calc(100vh - 72px);
}

.lesson-rail {
  align-self: start;
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  max-height: calc(100vh - 110px);
  overflow: auto;
  border: 1px solid rgba(16, 19, 24, .09);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .86);
  padding: 18px;
}

.lesson-rail h1 {
  margin: 8px 0 8px;
  font-size: 2rem;
  line-height: 1;
}

.lesson-rail p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.lesson-nav {
  display: grid;
  gap: 8px;
}

.lesson-tab {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  align-items: center;
  width: 100%;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink-2);
  padding: 8px;
  text-align: left;
}

.lesson-tab span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #edf2f7;
  color: var(--muted);
  font-size: .74rem;
  font-weight: 700;
}

.lesson-tab {
  transition: background .15s ease, border-color .15s ease;
}

.lesson-tab:hover {
  background: #eef2f7;
}

.lesson-tab.active {
  border-color: rgba(13, 122, 114, .25);
  background: var(--teal-soft);
}

.lesson-tab.active span {
  background: var(--teal);
  color: white;
}

.course-layout.amber .lesson-tab.active {
  border-color: rgba(180, 83, 9, .25);
  background: var(--amber-soft);
}

.course-layout.amber .lesson-tab.active span {
  background: var(--amber);
}

.course-layout.amber .eyebrow {
  color: var(--amber);
}

.course-layout.amber .takeaway {
  background: linear-gradient(90deg, var(--amber-soft), white 72%);
}

.course-layout.amber .checklist-panel input {
  accent-color: var(--amber);
}

.lesson-stage {
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-width: 0;
}

.lesson-toolbar {
  position: sticky;
  top: 84px;
  z-index: 4;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
  border-radius: var(--radius);
  background: rgba(247, 249, 252, .9);
  padding: 10px 0;
  backdrop-filter: blur(12px);
}

.lesson-toolbar h2 {
  margin: 8px 0 0;
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  line-height: 1.04;
}

.lesson-claim {
  border-radius: var(--radius);
  background: var(--ink);
  color: white;
  padding: clamp(22px, 4vw, 44px);
}

.lesson-claim p {
  margin: 0;
  max-width: 980px;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.1vw, 1.7rem);
  font-weight: 500;
  line-height: 1.35;
}

.lesson-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.lesson-card,
.prompt-panel,
.checklist-panel,
.quiz,
.signal-list {
  padding: clamp(18px, 2vw, 26px);
}

.lesson-card h3,
.prompt-panel h3,
.checklist-panel h3,
.quiz h3,
.signal-list h3 {
  margin: 0 0 10px;
  font-size: 1.14rem;
}

.lesson-card p,
.quiz p {
  margin: 0;
}

.signal-list ul,
.compact-list,
.source-list {
  display: grid;
  gap: 10px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.signal-list li {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
}

.signal-list svg {
  color: var(--green);
}

.route-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.route-hop {
  position: relative;
  min-height: 96px;
  border: 1px solid rgba(16, 19, 24, .1);
  border-radius: var(--radius);
  background: white;
  padding: 16px;
}

.route-hop span {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--ink);
  color: white;
  font-size: .78rem;
  font-weight: 700;
}

.route-hop strong {
  display: block;
  line-height: 1.2;
}

.prompt-panel {
  display: grid;
  grid-template-columns: minmax(180px, .32fr) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  background: #111827;
  color: white;
}

.prompt-panel .eyebrow {
  color: #7dd3fc;
}

.prompt-panel pre {
  margin: 0;
  overflow: auto;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .08);
  padding: 16px;
}

.prompt-panel code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .92rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.checklist-panel {
  display: grid;
  gap: 10px;
}

.checklist-panel label {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 10px;
  align-items: start;
  color: var(--ink-2);
  line-height: 1.45;
}

.checklist-panel input {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
  margin-top: 2px;
}

.takeaway {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: center;
  border: 1px solid rgba(16, 19, 24, .09);
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--teal-soft), white 72%);
  padding: 18px;
}

.takeaway span {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--ink);
  color: white;
}

.takeaway p {
  margin: 0;
  font-weight: 600;
}

.quiz-options {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.quiz-options button {
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f8fafc;
  padding: 11px 14px;
  text-align: left;
  transition: border-color .15s ease, background .15s ease;
}

.quiz-options button:hover {
  border-color: var(--muted);
  background: white;
}

.quiz-options button.correct {
  border-color: rgba(21, 128, 61, .55);
  background: #dcfce7;
}

.quiz-options button.incorrect {
  border-color: rgba(220, 38, 38, .5);
  background: #fee2e2;
}

.quiz-feedback {
  min-height: 48px;
  margin-top: 12px;
  border-radius: var(--radius);
  padding: 12px 14px;
  color: var(--muted);
}

.quiz-feedback.correct {
  background: #dcfce7;
  color: #166534;
}

.quiz-feedback.incorrect {
  background: #fee2e2;
  color: #991b1b;
}

.lesson-controls {
  justify-content: space-between;
}

.reference-hero {
  padding: clamp(34px, 7vw, 82px) clamp(18px, 5vw, 72px) 28px;
}

.term-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.term-card {
  padding: 20px;
}

.term-card h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.term-card p {
  margin: 0;
}

.source-list li {
  display: grid;
  gap: 4px;
}

.source-list a {
  color: var(--teal);
  font-weight: 600;
}

.source-list span {
  color: var(--muted);
  line-height: 1.45;
}

.site-footer {
  padding: 24px clamp(18px, 5vw, 72px);
  border-top: 1px solid rgba(216, 222, 232, .8);
}

.presentation-active [data-chrome] {
  display: none;
}

.presentation-active .lesson-toolbar[data-chrome],
.presentation-active .lesson-controls[data-chrome] {
  display: flex;
}

.presentation-active .lesson-toolbar {
  align-items: center;
  top: 14px;
  background: rgba(247, 249, 252, .92);
  padding: 10px;
}

.presentation-active .lesson-toolbar h2 {
  font-size: clamp(1.45rem, 2.4vw, 2.4rem);
}

.presentation-active .course-layout {
  display: block;
  padding: 20px;
}

.presentation-active .lesson-stage {
  max-width: 1260px;
  min-height: calc(100vh - 40px);
  margin: 0 auto;
  padding-bottom: 88px;
  justify-content: center;
}

.presentation-active .lesson-controls[data-chrome] {
  position: fixed;
  right: 20px;
  bottom: 20px;
  left: 20px;
  z-index: 12;
  max-width: 1260px;
  margin: 0 auto;
  border: 1px solid rgba(216, 222, 232, .85);
  border-radius: var(--radius);
  background: rgba(247, 249, 252, .92);
  padding: 10px;
  box-shadow: 0 16px 45px rgba(16, 19, 24, .18);
  backdrop-filter: blur(12px);
}

.presentation-active .lesson-claim p {
  font-size: clamp(1.7rem, 3.2vw, 3rem);
}

.presentation-active .lesson-toolbar h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.6rem);
}

@media (max-width: 980px) {
  .hero,
  .course-layout,
  .split,
  .reference-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .network-panel {
    min-height: 360px;
  }

  .lesson-rail {
    position: static;
    max-height: none;
  }

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

  .prompt-panel {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
  }

  .top-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 72px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: white;
    padding: 8px;
    box-shadow: var(--shadow);
  }

  .site-header.nav-open .top-nav {
    display: flex;
  }

  .hero h1,
  .reference-hero h1 {
    font-size: clamp(2.25rem, 11vw, 3.2rem);
    line-height: 1;
  }

  .hero {
    gap: 18px;
    padding-top: 26px;
    padding-bottom: 10px;
  }

  .hero p,
  .reference-hero p {
    font-size: 1rem;
    line-height: 1.5;
  }

  .course-grid,
  .lesson-card-grid,
  .term-grid {
    grid-template-columns: 1fr;
  }

  .lesson-toolbar,
  .lesson-controls,
  .course-card-top,
  .progress-meta,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .lesson-controls .button,
  .lesson-controls a,
  .toolbar-actions .ghost-button,
  .hero-actions .button {
    width: 100%;
  }

  .network-panel {
    min-height: 220px;
  }

  .course-layout {
    padding-top: 16px;
  }

  .lesson-rail {
    gap: 14px;
    padding: 14px;
  }

  .lesson-rail h1 {
    font-size: 1.65rem;
  }

  .lesson-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }

  .lesson-tab {
    flex: 0 0 190px;
    min-height: 54px;
  }

  .node {
    width: 64px;
    height: 64px;
    font-size: .84rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .packet {
    animation: none;
  }
}