/* ════════════════════════════════════════════════════
   ИИшница — Портал курса X-Waters
   Эталон: 01-install/macos-install.html
   ════════════════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #d1631f;
  --primary-dark: #b8551a;
  --bg: #ffffff;
  --fg: #1c1c1e;
  --dim: rgba(28,28,30,0.55);
  --card: #f7f7f8;
  --border: rgba(28,28,30,0.12);
  --soft: rgba(209,99,31,0.07);
  --red: #dc2626;
  --green: #16a34a;
  --blue: #1e3a8a;
}

html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }

/* ── TOP NAV ── */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: 64px;
  display: flex;
  align-items: center;
}
.top-bar-inner {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.top-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--fg);
  flex-shrink: 0;
}
.top-logo img { height: 28px; width: auto; }
.top-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.top-logo-text strong {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.top-logo-text span {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  margin-top: 2px;
}
.top-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.top-nav a {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--dim);
  transition: color 0.15s;
}
.top-nav a:hover, .top-nav a.active { color: var(--fg); }
.top-cta {
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  background: var(--primary);
  color: #fff;
  border-radius: 3px;
  letter-spacing: -0.01em;
  transition: background 0.15s;
}
.top-cta:hover { background: var(--primary-dark); }

/* ── LAYOUT ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
section { padding: 80px 0; }
section + section { border-top: 1px solid var(--border); }

/* ── HERO ── */
.hero {
  padding: 96px 0 88px;
  background: linear-gradient(140deg, #fff 55%, #fdf4ef 100%);
  border-bottom: 1px solid var(--border);
}
.hero-tag {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(36px, 5.5vw, 60px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  max-width: 820px;
}
.hero-title em {
  font-style: normal;
  color: var(--primary);
}
.hero-sub {
  font-size: clamp(16px, 1.6vw, 18px);
  color: var(--dim);
  margin-bottom: 36px;
  max-width: 620px;
  line-height: 1.55;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: all 0.15s;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  line-height: 1;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}
.btn-secondary {
  background: #fff;
  color: var(--fg);
  border-color: var(--border);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.btn-ghost {
  background: transparent;
  color: var(--primary);
  border-color: rgba(209,99,31,0.3);
}
.btn-ghost:hover { background: var(--soft); }
.btn-disabled {
  background: var(--card);
  color: rgba(28,28,30,0.35);
  cursor: not-allowed;
}
.btn-disabled:hover { transform: none; background: var(--card); }
.btn svg { flex-shrink: 0; }

/* ── SECTION HEADERS ── */
.section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.section-title .hl { color: var(--primary); }
.section-sub {
  font-size: 16px;
  color: var(--dim);
  line-height: 1.6;
  max-width: 640px;
  margin-bottom: 48px;
}

/* ── SCHEDULE GRID ── */
.schedule-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.lesson-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  min-height: 200px;
  transition: all 0.2s;
}
.lesson-card.active {
  cursor: pointer;
  background: #fff;
}
.lesson-card.active:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -8px rgba(209,99,31,0.18);
}
.lesson-card.upcoming {
  background: #fff;
}
.lesson-card.disabled {
  opacity: 0.5;
}
.lesson-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.lesson-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
  flex-grow: 0;
}
.lesson-desc {
  font-size: 13.5px;
  color: var(--dim);
  line-height: 1.5;
  margin-bottom: 18px;
  flex-grow: 1;
}
.lesson-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 5px 10px;
  border-radius: 3px;
  align-self: flex-start;
}
.lesson-status.done {
  background: rgba(22,163,74,0.1);
  color: var(--green);
}
.lesson-status.soon {
  background: var(--soft);
  color: var(--primary);
}
.lesson-status.future {
  background: var(--card);
  color: var(--dim);
  border: 1px solid var(--border);
}
.lesson-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ── QUICK LINKS ── */
.quick-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.quick-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.15s;
  text-decoration: none;
  color: inherit;
}
.quick-card:hover {
  background: #fff;
  border-color: var(--primary);
}
.quick-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--soft);
  border-radius: 6px;
  color: var(--primary);
  flex-shrink: 0;
}
.quick-text strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 2px;
}
.quick-text span {
  font-size: 12.5px;
  color: var(--dim);
}

/* ── DOWNLOADS TABLE ── */
.dl-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 56px;
}
.dl-step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 22px 20px;
}
.dl-step-num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
}
.dl-step-text {
  font-size: 14px;
  line-height: 1.5;
  color: var(--fg);
}
.dl-step-text code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  background: #fff;
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.dl-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: #fff;
}
.dl-table thead { background: var(--card); }
.dl-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.dl-table td {
  padding: 16px 18px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.dl-table tr:last-child td { border-bottom: none; }
.dl-table tr:hover td { background: #fcfbfa; }
.dl-table .dept { font-weight: 700; font-size: 14.5px; }
.dl-table .people { color: var(--dim); font-size: 13px; line-height: 1.45; }
.dl-table td:last-child { text-align: right; white-space: nowrap; }

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 13px;
  font-weight: 600;
  background: var(--primary);
  color: #fff;
  border-radius: 3px;
  transition: background 0.15s;
}
.btn-download:hover { background: var(--primary-dark); }

.locked-section {
  margin-top: 40px;
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 24px 22px;
}
.locked-section h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.locked-section p {
  font-size: 13.5px;
  color: var(--dim);
  margin-bottom: 14px;
}
.locked-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 0;
  border-top: 1px solid var(--border);
}
.locked-row:first-of-type { border-top: none; }
.locked-row strong {
  font-size: 14px;
  font-weight: 700;
  width: 180px;
  flex-shrink: 0;
}
.locked-row span {
  font-size: 13px;
  color: var(--dim);
  flex-grow: 1;
}
.locked-badge {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--dim);
  background: #fff;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 3px;
  text-transform: uppercase;
}

/* ── LESSON PAGE ── */
.lesson-hero {
  padding: 80px 0 56px;
  border-bottom: 1px solid var(--border);
}
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--dim);
  margin-bottom: 22px;
}
.breadcrumbs a:hover { color: var(--primary); }
.breadcrumbs .sep { color: var(--border); }

.lesson-meta {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-top: 24px;
}
.lesson-meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.lesson-meta-item .label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
}
.lesson-meta-item .value {
  font-size: 14.5px;
  font-weight: 600;
}

.lesson-section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
}
.lesson-section:last-child { border-bottom: none; }
.lesson-section h2 {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.lesson-section h2 .hl { color: var(--primary); }
.lesson-section p {
  font-size: 16px;
  color: var(--dim);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 720px;
}
.lesson-section p strong { color: var(--fg); }

.goals-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}
.goals-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--fg);
}
.goals-list .num {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  margin-top: 1px;
}

.material-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 8px;
}
.material-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 5px;
  transition: all 0.15s;
}
.material-link:hover {
  background: #fff;
  border-color: var(--primary);
}
.material-link svg { color: var(--primary); flex-shrink: 0; }
.material-link strong {
  font-size: 14px;
  font-weight: 600;
  display: block;
}
.material-link span {
  font-size: 12.5px;
  color: var(--dim);
}

.homework {
  background: var(--soft);
  border: 1px solid rgba(209,99,31,0.2);
  border-radius: 6px;
  padding: 24px 24px;
  margin-top: 8px;
}
.homework .label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.homework p { color: var(--fg); margin-bottom: 6px; font-size: 15px; }
.homework code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  background: #fff;
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

/* ── INLINE DIAGRAM CALLOUT ── */
.diagram-callout {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin: 28px 0 8px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
  max-width: 760px;
}
.diagram-callout:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 12px 28px -12px rgba(209,99,31,0.22);
}
.diagram-callout-icon {
  flex-shrink: 0;
  width: 88px;
  background: var(--soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  border-right: 1px solid var(--border);
}
.diagram-callout-body {
  flex: 1;
  padding: 18px 22px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}
.diagram-callout-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 4px;
}
.diagram-callout-title {
  font-size: 15.5px;
  font-weight: 700;
  margin-bottom: 4px;
  letter-spacing: -0.01em;
}
.diagram-callout-desc {
  font-size: 13px;
  color: var(--dim);
  line-height: 1.5;
}
.diagram-callout-arrow {
  flex-shrink: 0;
  padding: 0 22px;
  display: flex;
  align-items: center;
  color: var(--primary);
}

/* ── ANALOGY CARDS (квартира vs гостиница) ── */
.analogy-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.analogy-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 26px 24px;
}
.analogy-card.accent {
  background: var(--soft);
  border-color: rgba(209,99,31,0.25);
}
.analogy-card-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 8px;
}
.analogy-card.accent .analogy-card-label {
  color: var(--primary);
}
.analogy-card h3 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
}
.analogy-card p {
  font-size: 14.5px !important;
  color: var(--dim) !important;
  line-height: 1.55 !important;
  margin-bottom: 8px !important;
}
.analogy-card ul {
  list-style: none;
  margin-top: 12px;
}
.analogy-card li {
  font-size: 13.5px;
  color: var(--fg);
  padding: 4px 0 4px 16px;
  position: relative;
  line-height: 1.5;
}
.analogy-card li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--primary);
  font-weight: 700;
}

/* ── PROOF / QUOTE BLOCK ── */
.proof-block {
  background: var(--card);
  border-left: 3px solid var(--primary);
  padding: 22px 26px;
  margin: 24px 0;
  border-radius: 0 6px 6px 0;
}
.proof-block-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 10px;
}
.proof-block blockquote {
  font-size: 17px;
  line-height: 1.55;
  color: var(--fg);
  letter-spacing: -0.005em;
  font-weight: 500;
  margin-bottom: 10px;
}
.proof-block cite {
  font-size: 12.5px;
  color: var(--dim);
  font-style: normal;
  display: block;
}

/* ── MEMORY LEVELS GRID ── */
.memory-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 22px;
}
.memory-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 22px 22px;
}
.memory-card-num {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 12px;
}
.memory-card-num::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
}
.memory-card h3 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.memory-card .path {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--primary);
  background: #fff;
  padding: 3px 8px;
  border-radius: 3px;
  border: 1px solid var(--border);
  display: inline-block;
  margin-bottom: 12px;
}
.memory-card p {
  font-size: 13.5px;
  color: var(--dim);
  line-height: 1.55;
  margin: 0 !important;
}
.memory-card .example {
  font-size: 13px;
  color: var(--fg);
  font-style: italic;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

/* ── NOT TODAY (что не покрываем) ── */
.not-today {
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 24px 26px;
  margin-top: 24px;
}
.not-today-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 12px;
}
.not-today-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.not-today-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.not-today-item strong {
  font-size: 14px;
  font-weight: 700;
  display: block;
  margin-bottom: 3px;
}
.not-today-item span {
  font-size: 13px;
  color: var(--dim);
  line-height: 1.5;
}

/* ── 404 ── */
.error-wrap {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 32px;
  background: linear-gradient(140deg, #fff 55%, #fdf4ef 100%);
}
.error-inner {
  text-align: center;
  max-width: 480px;
}
.error-inner img {
  width: 200px;
  height: auto;
  margin-bottom: 28px;
  opacity: 0.92;
}
.error-code {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
}
.error-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.error-sub {
  font-size: 16px;
  color: var(--dim);
  line-height: 1.55;
  margin-bottom: 32px;
}

/* ── FOOTER ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 36px 0;
  background: var(--card);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--dim);
}
.footer-inner a { color: var(--primary); font-weight: 600; }
.footer-inner a:hover { text-decoration: underline; }

/* ════════════════════════════════════════════════════
   MOBILE
   ════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .schedule-grid { grid-template-columns: 1fr 1fr; }
  .dl-steps { grid-template-columns: 1fr; }
  .quick-grid { grid-template-columns: 1fr; }
  .material-list { grid-template-columns: 1fr; }
  .analogy-pair { grid-template-columns: 1fr; }
  .memory-grid { grid-template-columns: 1fr; }
  .not-today-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .diagram-callout { flex-direction: column; max-width: 100%; }
  .diagram-callout-icon { width: 100%; height: 60px; border-right: none; border-bottom: 1px solid var(--border); }
  .diagram-callout-arrow { padding: 14px 22px; justify-content: flex-end; border-top: 1px solid var(--border); }
}

@media (max-width: 720px) {
  .container { padding: 0 20px; }
  .top-bar-inner { padding: 0 20px; gap: 12px; }
  .top-nav { gap: 16px; }
  .top-nav a { font-size: 12.5px; }
  .top-nav a:not(.top-cta) { display: none; }
  .top-logo-text strong { font-size: 13px; }
  .top-logo-text span { font-size: 9px; }
  section { padding: 56px 0; }
  .hero { padding: 64px 0 56px; }
  .hero-title { font-size: clamp(28px, 8vw, 38px); }
  .hero-sub { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; width: 100%; }
  .schedule-grid { grid-template-columns: 1fr; }
  .dl-table { font-size: 13px; }
  .dl-table th, .dl-table td { padding: 12px 14px; }
  .dl-table .people { display: none; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 8px; }
  .locked-row { flex-direction: column; align-items: flex-start; gap: 6px; }
  .locked-row strong { width: auto; }
}

@media (max-width: 480px) {
  .top-bar { height: 56px; }
  .top-logo img { height: 24px; }
  .lesson-meta { gap: 16px; }
}