:root {
  color-scheme: light dark;
  --bg: #f7f5ef;
  --surface: #ffffff;
  --surface-soft: #f0f7f5;
  --ink: #182031;
  --muted: #5e6878;
  --rule: #d8d0c1;
  --teal: #0F5A52;
  --blue: #11716A;
  --amber: #9a6412;
  --rose: #9f274d;
  --shadow: 0 20px 50px rgba(24, 32, 49, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10151d;
    --surface: #171f2a;
    --surface-soft: #142421;
    --ink: #eef2f8;
    --muted: #a8b2c2;
    --rule: #2d3746;
    --teal: #5eead4;
    --blue: #8ec5ee;
    --amber: #f5c16c;
    --rose: #f3a0b8;
    --shadow: none;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--blue);
  font-weight: 700;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 12px;
  z-index: 20;
  transform: translateY(-160%);
  padding: 8px 12px;
  background: var(--ink);
  color: var(--surface);
  border-radius: 6px;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(18px, 4vw, 48px);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(18px);
}

.brand {
  color: var(--ink);
  font-size: 0.95rem;
}

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

.site-header nav a {
  color: var(--muted);
  font-size: 0.9rem;
}

.site-header nav a[aria-current="page"] {
  color: var(--teal);
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.9rem;
}

.hero {
  padding: clamp(28px, 5vw, 56px);
  margin-bottom: 28px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-soft) 100%);
  border: 1px solid var(--rule);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero.compact {
  padding: clamp(24px, 4vw, 42px);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 2vw, 1.9rem);
  line-height: 1.15;
}

h3 {
  margin: 0;
  font-size: clamp(1.1rem, 1.7vw, 1.5rem);
  line-height: 1.2;
}

h4 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 0.94rem;
}

.lede {
  max-width: 860px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.2rem);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.stat {
  min-height: 132px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stat strong {
  display: block;
  margin-top: 8px;
  color: var(--ink);
  font-size: 1.35rem;
  line-height: 1.2;
}

.stat p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
  margin: 28px 0;
}

.section-grid > article,
.course-card,
.lesson-guide {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

.section-grid > article {
  padding: 22px;
}

ul,
ol {
  margin: 0;
  padding-left: 1.25rem;
}

li {
  margin: 0 0 8px;
  color: var(--muted);
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.course-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
  min-height: 300px;
  padding: 20px;
}

.course-card p {
  color: var(--muted);
}

.course-card h3 {
  margin: 0 0 12px;
  font-size: clamp(1.35rem, 2vw, 1.9rem);
  line-height: 1.15;
}

.course-card dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 0;
}

.course-card dl > div {
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

dt {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

dd {
  margin: 4px 0 0;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 800;
}

.table-wrap {
  overflow-x: auto;
  margin-bottom: 28px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 840px;
  border-collapse: collapse;
}

caption {
  padding: 12px 14px;
  color: var(--muted);
  font-size: 0.86rem;
  text-align: left;
  caption-side: top;
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--rule);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

td {
  color: var(--muted);
  font-size: 0.92rem;
}

tr:last-child td {
  border-bottom: 0;
}

.lesson-stack {
  display: grid;
  gap: 18px;
}

.lesson-guide {
  scroll-margin-top: 92px;
  padding: 20px;
}

.lesson-heading {
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--rule);
}

.lesson-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(235px, 1fr));
  gap: 16px;
}

.lesson-columns section {
  min-height: 150px;
  padding: 14px;
  background: color-mix(in srgb, var(--surface-soft) 56%, transparent);
  border: 1px solid color-mix(in srgb, var(--rule) 72%, transparent);
  border-radius: 8px;
}

.lesson-columns p {
  margin: 0;
  color: var(--muted);
}

.lesson-columns p + p {
  margin-top: 8px;
}

.lesson-columns strong {
  color: var(--ink);
}

.companion-note {
  max-width: 840px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.96rem;
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  main {
    width: min(100% - 24px, 1180px);
    padding-top: 24px;
  }

  .hero {
    padding: 22px;
  }

  .stats-row,
  .section-grid,
  .course-grid,
  .lesson-columns {
    grid-template-columns: 1fr;
  }
}

@media print {
  :root {
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-soft: #ffffff;
    --ink: #111827;
    --muted: #374151;
    --rule: #d1d5db;
    --shadow: none;
  }

  body {
    background: #ffffff;
    color: #111827;
    font-size: 11pt;
  }

  .skip-link,
  .site-header,
  .breadcrumb {
    display: none;
  }

  main {
    width: 100%;
    padding: 0;
  }

  .hero,
  .section-grid > article,
  .course-card,
  .lesson-guide,
  .lesson-columns section,
  .table-wrap {
    border-color: #d1d5db;
    box-shadow: none;
    break-inside: avoid;
  }

  .hero {
    padding: 18px;
  }

  .section-grid,
  .lesson-columns,
  .stats-row {
    grid-template-columns: 1fr 1fr;
  }

  table {
    min-width: 0;
    table-layout: fixed;
  }

  a {
    color: #111827;
    text-decoration: none;
  }
}