:root {
  color-scheme: light;
  --ink: #18201f;
  --muted: #5e6865;
  --paper: #f8f6f0;
  --panel: #ffffff;
  --line: #d8d3c7;
  --accent: #1f6f68;
  --accent-2: #9a4f2f;
  --soft: #edf3f1;
  --code: #22302e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.48 ui-serif, Georgia, Cambria, "Times New Roman", serif;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 30px 28px 48px;
}

.home-main {
  max-width: 1120px;
  min-height: 100dvh;
  padding-bottom: 40px;
  padding-top: 40px;
}

.home-main.compact-home {
  align-items: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.compact-home header {
  border-bottom: 0;
  margin-bottom: 18px;
  max-width: 1120px;
  padding-bottom: 0;
  text-align: left;
  width: 100%;
}

.compact-home .lede {
  margin-left: auto;
  margin-right: auto;
}

.compact-home #missions {
  width: 100%;
}

.home-title-row {
  align-items: end;
  display: grid;
  gap: 24px;
  grid-template-columns: 1.1fr .9fr;
}

.home-kicker {
  color: var(--accent-2);
  font: 800 12px/1.2 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin-bottom: 5px;
  text-transform: uppercase;
}

.home-summary {
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: 16px;
  margin: 0;
  padding-left: 22px;
}

.course-sidebar {
  background: rgba(248, 246, 240, .96);
  border-left: 1px solid var(--line);
  bottom: 0;
  overflow-y: auto;
  padding: 20px 20px;
  position: fixed;
  right: 0;
  top: 0;
  width: 312px;
}

.course-brand {
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
  padding-bottom: 12px;
}

.course-brand a {
  color: var(--ink);
  font: 800 18px/1.2 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-decoration: none;
}

.course-brand p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  margin: 7px 0 0;
}

.sidebar-section {
  margin: 0 0 16px;
}

.sidebar-section h2 {
  color: var(--accent-2);
  font-size: 12px;
  letter-spacing: .08em;
  line-height: 1.2;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.sidebar-section a {
  border-radius: 6px;
  color: var(--ink);
  display: block;
  font: 600 14px/1.35 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  padding: 5px 8px;
  text-decoration: none;
}

.sidebar-section ol a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

.sidebar-section .subitem a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
  padding-left: 18px;
}

.sidebar-section .nav-label {
  color: var(--muted);
  font: 700 11px/1.25 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 8px 0 2px;
  padding: 0 8px;
  text-transform: uppercase;
}

.mission-select {
  appearance: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font: 700 14px/1.35 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  padding: 9px 10px;
  width: 100%;
}

.mission-select:focus {
  border-color: var(--accent);
  outline: 2px solid rgba(31, 111, 104, .18);
}

.sidebar-section a:hover,
.sidebar-section a[aria-current="page"] {
  background: var(--soft);
  color: var(--accent);
}

.sidebar-section ol,
.sidebar-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-note {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
  margin: 8px 8px 0;
}

header {
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
  padding-bottom: 16px;
}

.eyebrow {
  color: var(--accent-2);
  font: 700 12px/1.2 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  line-height: 1.12;
}

h1 {
  font-size: 34px;
  margin: 6px 0 8px;
}

h2 {
  font-size: 21px;
  margin: 24px 0 8px;
}

h3 {
  font-size: 17px;
  margin: 16px 0 6px;
}

p {
  margin: 0 0 10px;
}

a {
  color: var(--accent);
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

code {
  background: #ece8df;
  border-radius: 4px;
  color: var(--code);
  font-size: .92em;
  padding: 1px 5px;
}

pre {
  background: #f2efe7;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  color: var(--code);
  overflow: auto;
  padding: 14px;
}

.lede {
  color: var(--muted);
  font-size: 18px;
  max-width: 760px;
}

.grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.card h3 {
  margin-top: 0;
}

.card-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.interview-question {
  margin-bottom: 12px;
}

.interview-question h3 {
  font-size: 18px;
  line-height: 1.22;
}

.interview-question p:last-child,
.card p:last-child {
  margin-bottom: 0;
}

.concept-expansion {
  background: #fbfaf6;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-top: 12px;
  padding: 12px;
}

.concept-expansion h4 {
  color: var(--accent-2);
  font: 800 13px/1.2 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: .04em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

.concept-expansion table {
  margin-bottom: 0;
}

.concept-expansion td:first-child {
  color: var(--accent);
  font: 800 13px/1.3 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  width: 18%;
}

.concept-expansion td:last-child {
  font-size: 15px;
}

.concept-expansion tr[id] {
  scroll-margin-top: 16px;
}

.concept-expansion tr:target {
  background: var(--soft);
}

.concept-card-link {
  color: inherit;
  display: block;
  text-decoration: none;
}

.concept-card-link .card {
  min-height: 118px;
  transition: border-color .16s ease, background-color .16s ease, transform .16s ease;
}

.concept-card-link:hover .card,
.concept-card-link:focus-visible .card {
  background: #fbfaf6;
  border-color: var(--accent);
  transform: translateY(-1px);
}

.concept-card-link:focus-visible {
  border-radius: 8px;
  outline: 2px solid rgba(31, 111, 104, .22);
  outline-offset: 3px;
}

.callout {
  background: var(--soft);
  border-left: 4px solid var(--accent);
  padding: 12px 14px;
}

.exercise {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-top: 14px;
  padding: 14px;
}

.answer {
  border-top: 1px solid var(--line);
  display: none;
  margin-top: 12px;
  padding-top: 12px;
}

button {
  align-items: center;
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  color: white;
  cursor: pointer;
  display: inline-flex;
  font: 700 14px/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  justify-content: center;
  min-height: 36px;
  padding: 10px 13px;
}

table {
  border-collapse: collapse;
  margin: 10px 0;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 8px 7px;
  text-align: left;
  vertical-align: top;
}

th {
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
}

.small {
  color: var(--muted);
  font-size: 14px;
}

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

.mission-card-link {
  color: inherit;
  display: block;
  text-decoration: none;
}

.mission-card-link .card {
  min-height: 318px;
  transition: border-color .16s ease, transform .16s ease, background-color .16s ease;
}

.mission-card-link:hover .card,
.mission-card-link:focus-visible .card {
  background: #fbfaf6;
  border-color: var(--accent);
  transform: translateY(-2px);
}

.mission-card-link:focus-visible {
  border-radius: 8px;
  outline: 2px solid rgba(31, 111, 104, .22);
  outline-offset: 4px;
}

.mission-card-head {
  align-items: start;
  display: flex;
  gap: 16px;
  justify-content: space-between;
}

.mission-status {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  flex: 0 0 auto;
  font: 800 12px/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  padding: 7px 9px;
}

.mission-card-link h3 {
  font-size: 22px;
}

.mission-stats {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 12px 0;
  padding-top: 10px;
}

.mission-stat {
  border-right: 1px solid var(--line);
  padding-right: 12px;
}

.mission-stat:last-child {
  border-right: 0;
  padding-left: 12px;
}

.mission-stat strong {
  display: block;
  font: 800 20px/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.mission-stat span {
  color: var(--muted);
  display: block;
  font: 700 12px/1.25 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin-top: 6px;
}

.mission-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 12px 0;
}

.mission-topics span {
  background: var(--soft);
  border-radius: 999px;
  color: var(--accent);
  font: 700 12px/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  padding: 7px 9px;
}

.mission-next {
  background: #f1eee6;
  border-radius: 8px;
  color: var(--ink);
  font-size: 14px;
  margin-top: 10px;
  padding: 10px;
}

.mission-meta {
  color: var(--muted);
  font: 600 13px/1.35 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin-bottom: 8px;
}

@media (max-width: 760px) {
  main {
    padding: 20px 16px 42px;
  }

  .home-main {
    min-height: auto;
  }

  .home-title-row,
  .mission-list {
    grid-template-columns: 1fr;
  }

  .home-summary {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 16px;
  }

  h1 {
    font-size: 29px;
  }

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

  .card-grid,
  .compact-grid {
    grid-template-columns: 1fr;
  }

  .course-sidebar {
    border-bottom: 1px solid var(--line);
    border-left: 0;
    position: static;
    width: auto;
  }
}