* {
  box-sizing: border-box;
}

:root {
  --ink: #172026;
  --muted: #5c6972;
  --line: #d8e0e6;
  --paper: #ffffff;
  --wash: #f4f7f8;
  --teal: #007a78;
  --green: #2e7d32;
  --amber: #b96b00;
  --coral: #c2412d;
  --blue: #275f9f;
  --code: #20313c;
}

body {
  margin: 0;
  background: var(--wash);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.62;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page {
  max-width: 1160px;
  margin: 0 auto;
  padding: 28px;
}

.site-nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 14px 0 26px;
}

.brand {
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(330px, 0.98fr);
  gap: 32px;
  align-items: center;
  padding: 18px 0 34px;
}

.article-hero {
  grid-template-columns: minmax(0, 0.95fr) minmax(330px, 1.05fr);
}

.hero-media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: 0 18px 50px rgba(35, 49, 57, 0.10);
}

.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 860px;
  font-size: clamp(2.15rem, 5vw, 4.9rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.article-hero h1 {
  font-size: clamp(2.05rem, 4.4vw, 4.2rem);
}

.dek {
  max-width: 780px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.meta-row,
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.pill,
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  padding: 5px 10px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
}

.tag {
  background: #fbfcfd;
}

.layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 16px;
}

.toc h2 {
  margin: 0 0 12px;
  font-size: 0.92rem;
}

.toc a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
  border-top: 1px solid #edf1f3;
}

main {
  display: grid;
  gap: 22px;
}

section,
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

h2 {
  margin: 0 0 14px;
  font-size: 1.56rem;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin: 22px 0 8px;
  font-size: 1.08rem;
  line-height: 1.25;
}

p {
  margin: 0 0 14px;
}

.lead {
  color: var(--muted);
  font-size: 1.02rem;
}

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

.topic-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #fbfcfd;
}

.topic-card h2,
.topic-card h3 {
  margin-top: 0;
}

.topic-card .cta {
  margin-top: auto;
}

.score {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 12px;
  border-radius: 999px;
  padding: 5px 10px;
  background: #e9f5f4;
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 900;
}

ul,
ol {
  margin: 10px 0 0;
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  font-size: 0.92rem;
}

th,
td {
  border: 1px solid var(--line);
  padding: 10px;
  vertical-align: top;
  text-align: left;
}

th {
  background: #eef6f5;
  color: #123f3e;
}

code {
  border-radius: 6px;
  background: #edf2f4;
  color: var(--code);
  padding: 2px 5px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
}

.callout {
  border-left: 4px solid var(--amber);
  background: #fff8ed;
  padding: 14px 16px;
  border-radius: 0 8px 8px 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 16px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 13px;
  background: #fbfcfd;
}

.stat strong {
  display: block;
  font-size: 1.28rem;
}

.stat span {
  color: var(--muted);
  font-size: 0.82rem;
}

.source-list {
  columns: 2;
  column-gap: 28px;
}

.article-body p {
  font-size: 1.02rem;
}

.article-body h3 {
  margin-top: 28px;
}

.article-body .lede {
  color: var(--ink);
  font-size: 1.14rem;
  line-height: 1.7;
}

.pullquote {
  border-left: 4px solid var(--teal);
  background: #edf8f7;
  border-radius: 0 8px 8px 0;
  color: #123f3e;
  font-size: 1.08rem;
  font-weight: 800;
  margin: 22px 0;
  padding: 16px 18px;
}

.diagram {
  display: grid;
  gap: 8px;
  margin: 18px 0;
}

.diagram-row {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 12px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
  padding: 12px;
}

.diagram-row strong {
  color: var(--teal);
}

.code-block {
  overflow-x: auto;
  border-radius: 8px;
  background: #18262f;
  color: #eaf2f4;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 16px 0;
  padding: 16px;
}

.checklist {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 14px;
}

.check-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
  padding: 14px;
}

.check-item strong {
  display: block;
  margin-bottom: 4px;
}

.next-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

footer {
  padding: 26px 0 40px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .hero,
  .article-hero,
  .layout,
  .topic-grid,
  .next-grid {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .diagram-row,
  .checklist {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .page {
    padding: 18px;
  }

  section,
  .card {
    padding: 18px;
  }

  .site-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .source-list {
    columns: 1;
  }

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