:root {
  color-scheme: light;
  --bg: #f7f8f5;
  --ink: #17201b;
  --muted: #5a645e;
  --line: #d9ded6;
  --panel: #ffffff;
  --green: #0f6b4f;
  --cyan: #087b8c;
  --violet: #6d4ca8;
  --amber: #9b6b16;
  --rose: #b43b55;
  --code-bg: #111815;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(15, 107, 79, 0.06), transparent 360px),
    var(--bg);
  color: var(--ink);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    sans-serif;
  line-height: 1.6;
}

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

a:hover {
  color: var(--cyan);
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 245, 0.9);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
}

.nav {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1120px;
  min-height: 64px;
  padding: 0 24px;
}

.brand {
  color: var(--ink);
  font-weight: 750;
  letter-spacing: 0;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

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

main {
  margin: 0 auto;
  max-width: 1120px;
  padding: 56px 24px 80px;
}

.hero {
  align-items: center;
  display: grid;
  gap: 48px;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
  margin-bottom: 64px;
}

.eyebrow {
  color: var(--green);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(42px, 7vw, 76px);
  margin: 0 0 20px;
  max-width: 850px;
}

h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin: 0 0 16px;
}

h3 {
  font-size: 20px;
  margin: 0 0 8px;
}

.lede {
  color: var(--muted);
  font-size: clamp(18px, 2vw, 22px);
  margin: 0;
  max-width: 760px;
}

.hero-actions,
.post-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  align-items: center;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 8px;
  color: white;
  display: inline-flex;
  font-size: 14px;
  font-weight: 700;
  min-height: 42px;
  padding: 0 16px;
  text-decoration: none;
}

.button.secondary {
  background: transparent;
  color: var(--ink);
}

.button:hover {
  background: var(--green);
  border-color: var(--green);
  color: white;
}

.system-visual {
  background:
    linear-gradient(135deg, rgba(15, 107, 79, 0.14), transparent 42%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 360px;
  padding: 24px;
}

.visual-title {
  display: flex;
  justify-content: space-between;
  margin-bottom: 22px;
}

.visual-title strong {
  font-size: 13px;
}

.visual-title span {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
}

.visual-grid {
  display: grid;
  gap: 14px;
}

.node {
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.76);
  padding: 14px 16px;
}

.node strong {
  display: block;
  font-size: 14px;
}

.node span {
  color: var(--muted);
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  margin-top: 2px;
}

.node.cyan {
  border-left-color: var(--cyan);
}

.node.violet {
  border-left-color: var(--violet);
}

.node.amber {
  border-left-color: var(--amber);
}

.node.rose {
  border-left-color: var(--rose);
}

.section-head {
  align-items: end;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin-bottom: 20px;
}

.section-head p {
  color: var(--muted);
  margin: 0;
  max-width: 540px;
}

.post-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.post-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  min-height: 260px;
  padding: 22px;
  text-decoration: none;
}

.post-card:hover {
  border-color: var(--green);
}

.post-card time,
.post-meta {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
}

.post-card p {
  color: var(--muted);
  margin: 12px 0 0;
}

.post-card .read-more {
  color: var(--green);
  font-weight: 750;
  margin-top: auto;
  padding-top: 24px;
}

.post-layout {
  display: grid;
  gap: 56px;
  grid-template-columns: minmax(0, 720px) minmax(220px, 280px);
}

.post-body {
  min-width: 0;
}

.post-body h1 {
  font-size: clamp(38px, 6vw, 64px);
}

.post-body h2 {
  margin-top: 48px;
}

.post-body p,
.post-body li {
  color: #2f3933;
  font-size: 18px;
}

.post-body ul,
.post-body ol {
  padding-left: 22px;
}

.post-body blockquote {
  border-left: 4px solid var(--green);
  color: #2f3933;
  margin: 28px 0;
  padding: 4px 0 4px 20px;
}

.post-body code {
  background: rgba(15, 107, 79, 0.08);
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  padding: 2px 5px;
}

pre {
  background: var(--code-bg);
  border-radius: 8px;
  color: #d8f3e5;
  overflow-x: auto;
  padding: 18px;
}

pre code {
  background: transparent !important;
  padding: 0 !important;
}

.aside {
  align-self: start;
  border-left: 1px solid var(--line);
  color: var(--muted);
  padding-left: 20px;
  position: sticky;
  top: 96px;
}

.aside h2 {
  color: var(--ink);
  font-size: 16px;
  margin-top: 0;
}

.aside a {
  display: block;
  font-size: 14px;
  margin: 10px 0;
  text-decoration: none;
}

.callout {
  background: rgba(8, 123, 140, 0.08);
  border: 1px solid rgba(8, 123, 140, 0.24);
  border-radius: 8px;
  margin: 28px 0;
  padding: 18px 20px;
}

.callout p {
  margin: 0;
}

.post-figure {
  margin: 32px 0;
}

.post-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 18px 40px -28px rgba(23, 32, 27, 0.4);
}

.post-figure figcaption {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 10px;
  text-align: center;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  margin: 0 auto;
  max-width: 1120px;
  padding: 28px 24px 40px;
}

@media (max-width: 860px) {
  .hero,
  .post-layout,
  .post-grid {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .aside {
    border-left: none;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-top: 20px;
    position: static;
  }
}

@media (max-width: 560px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
    padding-bottom: 14px;
    padding-top: 14px;
  }

  main {
    padding-top: 36px;
  }

  .system-visual {
    min-height: 0;
  }
}