:root {
  color-scheme: light;
  --bg: #fffaf7;
  --surface: #f5ede8;
  --panel: #ffffff;
  --text: #16110f;
  --muted: #675b55;
  --border: #e4d8d1;
  --accent: #ff3d12;
  --accent-strong: #d92c09;
  --accent-soft: #ffe7df;
  --accent-glow: rgba(255, 61, 18, 0.25);
  --code-bg: #160d0a;
  --code-text: #fff7f3;
  --warning: #fff1c6;
  --shadow: 0 18px 44px rgba(55, 20, 5, 0.12);
}

:root.dark {
  color-scheme: dark;
  --bg: #030303;
  --surface: #0d0908;
  --panel: #050505;
  --text: #fff8f4;
  --muted: #c9bbb4;
  --border: #251815;
  --accent: #ff3d12;
  --accent-strong: #ff6a3d;
  --accent-soft: #21100b;
  --accent-glow: rgba(255, 61, 18, 0.48);
  --code-bg: #120b09;
  --code-text: #fff8f4;
  --warning: #372712;
  --shadow: 0 20px 50px rgba(255, 61, 18, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 50% 0, var(--accent-glow), transparent 34rem),
    linear-gradient(180deg, var(--surface) 0, var(--bg) 20rem);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 18px;
  height: 58px;
  padding: 0 18px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 18px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, #ff6a1a 0%, #ff3514 52%, #b91500 100%);
  color: #fff;
  font-weight: 900;
  box-shadow: 0 0 24px var(--accent-glow);
}

.topnav {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  flex: 1;
}

.topnav a {
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 14px;
  color: var(--text);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
}

.topnav a:hover,
.topnav a.is-active {
  background: var(--accent);
  color: #130604;
}

.menu-button,
.theme-toggle,
.run-button,
.nav-button,
.quiz-option {
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
}

.theme-toggle,
.menu-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
}

.theme-toggle {
  gap: 8px;
  min-width: 106px;
  padding: 0 11px;
  font-weight: 800;
}

.toggle-track {
  position: relative;
  width: 34px;
  height: 18px;
  border-radius: 999px;
  background: #2f201a;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--text) 20%, transparent);
}

.toggle-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
  transition: transform 160ms ease;
}

:root.dark .toggle-knob {
  transform: translateX(16px);
}

.menu-button {
  display: none;
  width: 38px;
  flex-direction: column;
  gap: 4px;
}

.menu-button span {
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 999px;
}

.app-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 210px;
  min-height: calc(100vh - 58px);
}

.sidebar {
  position: sticky;
  top: 58px;
  align-self: start;
  height: calc(100vh - 58px);
  overflow: auto;
  background: color-mix(in srgb, var(--surface) 94%, var(--bg));
  border-right: 1px solid var(--border);
}

.sidebar-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  gap: 12px;
  padding: 18px;
  background: color-mix(in srgb, var(--surface) 94%, var(--bg));
  border-bottom: 1px solid var(--border);
}

.sidebar-header strong {
  font-size: 21px;
}

#lessonSearch {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.lesson-list {
  padding: 8px 0 18px;
}

.lesson-link {
  display: block;
  padding: 7px 18px;
  color: var(--text);
  font-size: 14px;
  text-decoration: none;
  border-left: 4px solid transparent;
}

.lesson-link:hover {
  background: color-mix(in srgb, var(--accent-soft) 70%, transparent);
}

.lesson-link.is-active {
  background: var(--accent);
  color: #130604;
  border-left-color: var(--accent-strong);
  font-weight: 700;
}

.empty-state {
  margin: 12px 18px;
  color: var(--muted);
  font-size: 14px;
}

.content {
  width: 100%;
  max-width: 980px;
  padding: 34px 34px 60px;
}

.lesson-kicker {
  color: var(--accent-strong);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 8px 0 14px;
  font-size: clamp(34px, 4vw, 50px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin: 34px 0 10px;
  font-size: 26px;
  letter-spacing: 0;
}

h3 {
  margin: 24px 0 8px;
}

.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 19px;
}

.notice {
  margin: 22px 0;
  padding: 16px 18px;
  background: var(--accent-soft);
  border-left: 5px solid var(--accent);
  border-radius: 6px;
  box-shadow: 0 0 30px color-mix(in srgb, var(--accent-glow) 42%, transparent);
}

.warning {
  background: var(--warning);
  border-left-color: #d9a600;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 22px 0;
}

.mini-card {
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.mini-card strong {
  display: block;
  margin-bottom: 6px;
}

.explainer {
  margin: 12px 0 28px;
}

.explainer > p {
  max-width: 780px;
  color: var(--muted);
  font-size: 17px;
}

.mini-card p {
  margin: 0;
  color: var(--muted);
}

.syntax-list {
  display: grid;
  gap: 10px;
  margin: 14px 0 28px;
}

.syntax-item {
  display: grid;
  grid-template-columns: minmax(180px, 280px) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.syntax-item code {
  display: block;
  overflow: auto;
  padding: 8px 10px;
  color: var(--code-text);
  background: var(--code-bg);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 6px;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 13px;
  white-space: nowrap;
}

.syntax-item p {
  margin: 3px 0 0;
  color: var(--muted);
}

.code-block,
.editor textarea {
  width: 100%;
  overflow: auto;
  color: var(--code-text);
  background: var(--code-bg);
  border: 1px solid #24323a;
  border-radius: 8px;
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 14px;
  line-height: 1.5;
}

.code-block {
  padding: 18px;
  white-space: pre;
}

.token-doctype,
.token-comment {
  color: #9f8f86;
}

.token-bracket {
  color: #ff8d66;
}

.token-tag {
  color: #ff3d12;
  font-weight: 800;
}

.token-selector {
  color: #ff8d66;
  font-weight: 800;
}

.token-property {
  color: #ffd38c;
}

.token-brace {
  color: #d7c6bd;
}

.token-attr {
  color: #ffd38c;
}

.token-equals {
  color: #d7c6bd;
}

.token-string {
  color: #9ff0c0;
}

.token-keyword {
  color: #ff7048;
  font-weight: 800;
}

.token-global {
  color: #8fd8ff;
}

.editor {
  margin: 18px 0 28px;
  overflow: hidden;
  background: color-mix(in srgb, var(--surface) 88%, var(--panel));
  border: 1px solid var(--border);
  border-radius: 8px;
}

.editor-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.editor-title {
  font-weight: 800;
}

.run-button,
.nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 16px;
  background: var(--accent);
  color: #130604;
  text-decoration: none;
  font-weight: 800;
}

.run-button:hover,
.nav-button:hover {
  background: var(--accent-strong);
}

.editor textarea {
  display: block;
  min-height: 260px;
  padding: 16px;
  border-radius: 0;
  resize: vertical;
}

.preview {
  min-height: 260px;
  background: #fff;
  border: 0;
  border-top: 1px solid var(--border);
}

.preview iframe {
  display: block;
  width: 100%;
  min-height: 260px;
  border: 0;
  background: #fff;
}

.practice-box,
.quiz-box {
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

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

.quiz-option {
  min-height: 42px;
  padding: 10px 12px;
  color: var(--text);
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
}

.quiz-option.correct {
  background: var(--accent-soft);
  border-color: var(--accent);
  font-weight: 800;
}

.quiz-option.incorrect {
  background: #ffe2df;
  color: #72251d;
  border-color: #df7d72;
}

.quiz-result {
  min-height: 28px;
  margin-top: 12px;
  color: var(--muted);
  font-weight: 700;
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.nav-button.secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.page-tools {
  position: sticky;
  top: 82px;
  align-self: start;
  padding: 24px 18px;
}

.tool-panel {
  display: grid;
  gap: 9px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.tool-panel a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.coming-soon {
  display: grid;
  place-items: center;
  min-height: 60vh;
  text-align: center;
}

@media (max-width: 1080px) {
  .app-shell {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .page-tools {
    display: none;
  }
}

@media (max-width: 760px) {
  .topbar {
    gap: 10px;
    padding: 0 12px;
  }

  .topnav {
    display: none;
  }

  .menu-button {
    display: inline-grid;
  }

  .app-shell {
    display: block;
  }

  .sidebar {
    position: fixed;
    top: 58px;
    left: 0;
    z-index: 20;
    width: min(86vw, 320px);
    transform: translateX(-102%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .content {
    padding: 26px 18px 50px;
  }

  .lesson-grid {
    grid-template-columns: 1fr;
  }

  .syntax-item {
    grid-template-columns: 1fr;
  }

  .lesson-nav {
    flex-direction: column;
  }
}

/* Modern Kodlabs interface */
:root {
  --bg: #fff8f2;
  --surface: #f2e9e2;
  --panel: #fffdfb;
  --panel-2: #fff3ec;
  --text: #17110f;
  --muted: #6d5e56;
  --border: #ead8cd;
  --accent: #ff3d12;
  --accent-strong: #c92c0d;
  --accent-soft: #fff0e9;
  --code-bg: #140b08;
  --shadow: 0 24px 70px rgba(74, 24, 5, 0.13);
}

:root.dark {
  --bg: #030303;
  --surface: #090706;
  --panel: #100c0b;
  --panel-2: #17100e;
  --text: #fff8f3;
  --muted: #c9bab1;
  --border: #2b1d18;
  --accent: #ff3d12;
  --accent-strong: #ff7048;
  --accent-soft: #24100a;
  --code-bg: #090706;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
}

body {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--accent-soft) 48%, transparent) 0, transparent 360px),
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--border) 35%, transparent) 0 1px, transparent 1px 96px),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

.topbar {
  height: 70px;
  padding: 0 clamp(16px, 3vw, 34px);
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
}

.brand {
  font-size: 19px;
  letter-spacing: 0;
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
}

.topnav {
  justify-content: center;
  gap: 8px;
}

.topnav a {
  height: 42px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--muted);
}

.topnav a:hover {
  color: var(--text);
  background: var(--panel-2);
  border-color: var(--border);
}

.topnav a.is-active {
  color: #170805;
  background: var(--accent);
  box-shadow: 0 12px 28px rgba(255, 61, 18, 0.28);
}

.theme-toggle,
.menu-button {
  height: 42px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel-2) 88%, transparent);
}

.app-shell {
  grid-template-columns: 300px minmax(0, 1fr) 230px;
  gap: clamp(16px, 2.5vw, 34px);
  max-width: 1620px;
  margin: 0 auto;
  padding: 24px clamp(16px, 3vw, 34px) 48px;
}

.sidebar {
  top: 94px;
  height: calc(100vh - 118px);
  border: 1px solid var(--border);
  border-radius: 20px;
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.sidebar-header {
  padding: 18px;
  background: linear-gradient(180deg, var(--panel), color-mix(in srgb, var(--panel) 80%, transparent));
  border-bottom: 1px solid var(--border);
}

.sidebar-header strong {
  font-size: 18px;
}

#lessonSearch {
  min-height: 44px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--surface);
  outline: 0;
}

#lessonSearch:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}

.lesson-list {
  display: grid;
  gap: 4px;
  padding: 12px;
}

.lesson-link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-left: 0;
  border-radius: 12px;
  color: var(--muted);
}

.lesson-link:hover {
  color: var(--text);
  background: var(--panel-2);
  border-color: var(--border);
}

.lesson-link.is-active {
  color: var(--text);
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 22%, var(--panel)), var(--panel-2));
  border-color: color-mix(in srgb, var(--accent) 48%, var(--border));
  box-shadow: inset 3px 0 0 var(--accent);
}

.lesson-index {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  color: var(--muted);
  background: var(--surface);
  font-size: 11px;
  font-weight: 800;
}

.lesson-link.is-active .lesson-index {
  color: #170805;
  background: var(--accent);
}

.lesson-group {
  display: block;
  margin: 16px 10px 6px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.lesson-badge {
  display: inline-flex;
  align-items: center;
  min-height: 18px;
  margin-left: 8px;
  padding: 0 6px;
  color: #170805;
  background: var(--accent);
  border-radius: 999px;
  font-size: 10px;
  font-weight: 900;
  vertical-align: middle;
}

.content {
  max-width: 960px;
  padding: 0 0 72px;
}

.lesson-article {
  display: grid;
  gap: 26px;
}

.lesson-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 210px;
  gap: 24px;
  align-items: end;
  padding: clamp(26px, 5vw, 56px);
  overflow: hidden;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--panel) 94%, transparent), color-mix(in srgb, var(--accent-soft) 88%, transparent)),
    linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent) 9%, transparent));
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.lesson-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  margin: 0 0 16px;
  padding: 0 12px;
  color: var(--accent-strong);
  background: color-mix(in srgb, var(--accent-soft) 78%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--border));
  border-radius: 999px;
}

h1 {
  max-width: 820px;
  margin: 0 0 16px;
  font-size: clamp(42px, 6vw, 76px);
  line-height: 0.98;
}

.lead {
  max-width: 730px;
  font-size: clamp(18px, 2vw, 22px);
}

.lesson-status {
  display: grid;
  gap: 10px;
  padding: 18px;
  background: color-mix(in srgb, var(--bg) 52%, transparent);
  border: 1px solid var(--border);
  border-radius: 18px;
}

.lesson-status span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.lesson-status strong {
  font-size: 32px;
  line-height: 1;
}

.progress-track {
  height: 8px;
  overflow: hidden;
  background: var(--surface);
  border-radius: 999px;
}

.progress-track span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  border-radius: inherit;
}

.lesson-brief,
.explainer,
.syntax-list,
.editor,
.practice-box,
.quiz-box {
  margin: 0;
}

.lesson-brief {
  padding: 22px 24px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.brief-label {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.lesson-brief ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
}

h2 {
  margin: 12px 0 -10px;
  font-size: clamp(24px, 3vw, 34px);
}

.lesson-grid {
  gap: 16px;
}

.mini-card,
.syntax-item,
.practice-box,
.quiz-box {
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  border-radius: 18px;
  box-shadow: none;
}

.mini-card {
  padding: 20px;
}

.syntax-list {
  gap: 12px;
}

.syntax-item {
  grid-template-columns: minmax(220px, 330px) minmax(0, 1fr);
  padding: 14px;
}

.syntax-item code {
  border-radius: 12px;
}

.code-block {
  margin: 0;
  padding: 22px;
  border-color: color-mix(in srgb, var(--accent) 28%, #32221c);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.editor {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.editor-toolbar {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  padding: 14px 16px;
  background: var(--panel);
}

.editor-title {
  font-size: 16px;
}

.editor-subtitle {
  color: var(--muted);
  font-size: 13px;
}

.editor textarea {
  min-height: 360px;
  border: 0;
  border-radius: 0;
}

.preview {
  min-height: 360px;
  border-top: 0;
  border-left: 1px solid var(--border);
}

.preview iframe {
  min-height: 360px;
}

.run-button,
.nav-button {
  min-height: 42px;
  border-radius: 999px;
  box-shadow: 0 14px 28px rgba(255, 61, 18, 0.25);
}

.nav-button.secondary {
  box-shadow: none;
}

.quiz-options {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.quiz-option {
  min-height: 58px;
  border-radius: 14px;
}

.page-tools {
  top: 94px;
  padding: 0;
}

.tool-panel {
  gap: 6px;
  padding: 14px;
  background: color-mix(in srgb, var(--panel) 82%, transparent);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.tool-panel a {
  min-height: 34px;
  padding: 7px 10px;
  border-radius: 10px;
}

.tool-panel a:hover {
  color: var(--text);
  background: var(--panel-2);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  max-width: 1620px;
  margin: 0 auto;
  padding: 26px clamp(16px, 3vw, 34px) 38px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.site-footer strong {
  color: var(--text);
}

.site-footer p {
  max-width: 560px;
  margin: 6px 0 0;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.site-footer a,
.legal-page a {
  color: var(--accent-strong);
  text-decoration: none;
}

.site-footer a:hover,
.legal-page a:hover {
  text-decoration: underline;
}

.static-summary,
.legal-page {
  width: min(860px, calc(100% - 32px));
  margin: 48px auto;
  padding: clamp(24px, 5vw, 46px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.legal-page h1 {
  margin-top: 14px;
  font-size: clamp(36px, 7vw, 64px);
}

.legal-page h2 {
  margin: 28px 0 8px;
}

.legal-page p {
  color: var(--muted);
}

.legal-brand {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  color: #170805;
  background: var(--accent);
  border-radius: 999px;
  font-weight: 900;
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: 280px minmax(0, 1fr);
  }
}

@media (max-width: 880px) {
  .lesson-hero,
  .editor,
  .syntax-item {
    grid-template-columns: 1fr;
  }

  .preview {
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .topbar {
    height: 64px;
  }

  .sidebar {
    top: 76px;
    height: calc(100vh - 92px);
    border-radius: 0 20px 20px 0;
  }

  .content {
    padding: 0 0 48px;
  }

  .lesson-hero {
    padding: 24px 20px;
    border-radius: 22px;
  }

  h1 {
    font-size: clamp(36px, 14vw, 58px);
  }

  .editor-toolbar {
    grid-template-columns: 1fr auto;
  }

  .editor-subtitle {
    grid-column: 1 / -1;
  }

  .site-footer {
    display: grid;
  }
}