:root {
  color-scheme: light dark;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --ink: #172033;
  --muted: #5d697c;
  --line: #d9deea;
  --brand: #0f766e;
  --brand-strong: #0b5e59;
  --accent: #b45309;
  --code: #111827;
  --code-bg: #eef2f7;
}

* {
  box-sizing: border-box;
}

html {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--ink);
}

body {
  margin: 0;
}

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

a:hover {
  color: var(--brand-strong);
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
}

.topbar-inner,
.layout {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  font-size: 0.96rem;
  text-decoration: none;
}

.nav a:hover {
  color: var(--ink);
}

.layout {
  padding: 42px 0 64px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 34px;
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

h1,
h2,
h3 {
  line-height: 1.24;
  margin: 0 0 14px;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
}

h2 {
  font-size: 1.55rem;
  margin-top: 34px;
}

h3 {
  font-size: 1.15rem;
  margin-top: 26px;
}

p {
  margin: 0 0 16px;
}

.lead {
  color: var(--muted);
  font-size: 1.12rem;
  max-width: 760px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 26px 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

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

.article-list {
  display: grid;
  gap: 14px;
}

.article-list a {
  display: block;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--ink);
}

.article-list a:hover {
  border-color: var(--brand);
}

.article-list strong {
  display: block;
  margin-bottom: 6px;
}

.article-list span {
  display: block;
  color: var(--muted);
}

.prose {
  max-width: 820px;
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
  margin: 0 0 18px;
}

.prose li {
  margin-bottom: 8px;
}

code {
  color: var(--code);
  background: var(--code-bg);
  border-radius: 5px;
  padding: 0.12rem 0.34rem;
}

.note {
  border-left: 4px solid var(--brand);
  background: #eef8f6;
  padding: 14px 16px;
  margin: 22px 0;
}

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 24px 0 36px;
  font-size: 0.94rem;
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .layout {
    padding-top: 30px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --surface: #182235;
    --ink: #f7fafc;
    --muted: #b6c0d0;
    --line: #2c3950;
    --brand: #5eead4;
    --brand-strong: #99f6e4;
    --accent: #fbbf24;
    --code: #f8fafc;
    --code-bg: #273244;
  }

  .topbar {
    background: rgba(17, 24, 39, 0.94);
  }

  .note {
    background: #122f2b;
  }
}