:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #52616b;
  --line: #d8e0e5;
  --paper: #f7f9f7;
  --white: #ffffff;
  --green: #0f766e;
  --orange: #c75c13;
  --blue: #2563eb;
  --yellow: #b7791f;
  --shadow: 0 16px 40px rgba(23, 32, 38, 0.11);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
}

a {
  color: inherit;
}

code {
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.95em;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 64px;
  padding: 0 5vw;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.site-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--muted);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--green);
}

.brand {
  margin-right: auto;
  font-weight: 800;
  color: var(--ink) !important;
}

.hero {
  padding: 5rem 5vw 3.5rem;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--orange);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.4rem, 7vw, 5.25rem);
  line-height: 1.03;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.6rem;
  font-size: 1.14rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  font-size: clamp(1.05rem, 1.7vw, 1.32rem);
  color: var(--muted);
}

.band {
  padding: 4.5rem 5vw;
}

.lab-card {
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 8px;
  box-shadow: 0 1px 0 rgba(23, 32, 38, 0.04);
}

.section-head {
  width: min(960px, 100%);
  margin: 0 auto 2rem;
}

.lab-grid {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.lab-card {
  min-height: 230px;
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.lab-card:hover,
.lab-card:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(15, 118, 110, 0.42);
  box-shadow: var(--shadow);
}

.lab-meta {
  color: var(--yellow);
  font-size: 0.84rem;
  font-weight: 800;
}

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

.card-link {
  margin-top: auto;
  color: var(--green);
  font-weight: 800;
}

.site-footer {
  padding: 2rem 5vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: var(--white);
}

.site-footer p {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.lab-page {
  width: min(980px, 90vw);
  margin: 0 auto;
  padding: 3rem 0 4.5rem;
}

.lab-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.lab-hero h1 {
  color: var(--ink);
  font-size: clamp(2rem, 5vw, 4rem);
}

.lab-hero p {
  color: var(--muted);
  font-size: 1.12rem;
}

.back-link,
.button-link {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  margin-bottom: 1.25rem;
  color: var(--green);
  font-weight: 800;
  text-decoration: none;
}

.lab-detail {
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
}

.lab-detail.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
}

.lab-detail li {
  margin-bottom: 0.45rem;
}

.deliverables {
  columns: 2;
}

.lab-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding-top: 2rem;
}

.lab-nav a,
.lab-nav span {
  min-height: 56px;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--green);
  font-weight: 800;
  text-decoration: none;
}

.lab-nav span {
  color: var(--muted);
}

.full-handout {
  padding: 2.4rem 0;
}

.full-handout > h2 {
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.markdown-body {
  max-width: 860px;
}

.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5 {
  margin-top: 2rem;
}

.markdown-body h2 {
  font-size: 1.75rem;
}

.markdown-body h3 {
  font-size: 1.35rem;
}

.markdown-body p,
.markdown-body li {
  color: #27343b;
}

.markdown-body a {
  color: var(--green);
  font-weight: 700;
}

.markdown-body pre {
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid #21313a;
  border-radius: 8px;
  background: #101820;
  color: #f5f7f8;
}

.markdown-body pre code {
  color: inherit;
  white-space: pre;
}

.markdown-body table {
  width: 100%;
  margin: 1.2rem 0;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.markdown-body th,
.markdown-body td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  background: #edf4f1;
  color: var(--ink);
}

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

.markdown-body :not(pre) > code {
  padding: 0.12rem 0.28rem;
  border-radius: 5px;
  background: #e7efea;
  color: #0f513d;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.4rem;
}

.not-found {
  width: min(760px, 90vw);
  min-height: calc(100vh - 64px);
  margin: 0 auto;
  padding: 5rem 0;
}

@media (max-width: 860px) {
  .site-nav {
    gap: 0.65rem;
    min-height: 58px;
  }

  .site-nav a:not(.brand) {
    font-size: 0.86rem;
  }

  .lab-detail.split {
    grid-template-columns: 1fr;
  }

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

  .lab-card {
    min-height: 0;
  }

  .deliverables {
    columns: 1;
  }

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

@media (max-width: 520px) {
  .brand {
    width: 100%;
  }

  .site-nav {
    flex-wrap: wrap;
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
  }
}