:root {
  --ink: #14212b;
  --muted: #60717d;
  --paper: #f7f8f4;
  --surface: #ffffff;
  --line: #d9e0dc;
  --accent: #007f78;
  --accent-dark: #00645f;
  --navy: #0b2739;
  --code-bg: #102631;
  --code-ink: #d5f4ed;
  --sans: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(20, 33, 43, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 33, 43, 0.025) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

.shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  color: white;
  background: var(--navy);
}

.skip-link:focus { top: 12px; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 244, 0.93);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-title {
  color: var(--navy);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.prompt {
  margin-right: 8px;
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 500;
}

.site-nav { display: flex; gap: 28px; }

.site-nav a {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover { color: var(--accent-dark); }

.hero {
  max-width: 900px;
  padding: 112px 0 98px;
}

.eyebrow,
.error-code {
  margin: 0 0 16px;
  color: var(--accent-dark);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero h1,
.page h1,
.not-found h1 {
  max-width: 900px;
  margin: 0;
  color: var(--navy);
  font-size: clamp(2.5rem, 7vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.hero-copy {
  max-width: 720px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.65;
}

.notes-section { padding: 0 0 112px; }

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0 0 14px;
  border-bottom: 1px solid var(--ink);
}

.section-heading h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.section-heading span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.note-list { display: grid; }

.note-card {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) auto;
  gap: 24px 34px;
  align-items: start;
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.note-card-meta {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.note-card-meta span { color: var(--accent-dark); }

.note-card h3 {
  margin: -4px 0 8px;
  color: var(--navy);
  font-size: clamp(1.35rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.note-card h3 a { color: inherit; text-decoration: none; }

.note-card h3 a:hover { color: var(--accent-dark); }

.note-card p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.read-link {
  white-space: nowrap;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
}

.post {
  max-width: 820px;
  margin: 0 auto;
  padding: 94px 0 110px;
}

.post-header {
  padding-bottom: 46px;
  border-bottom: 1px solid var(--line);
}

.post-header h1 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(2.35rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.05em;
}

.post-deck {
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1.6;
}

.post-meta {
  display: flex;
  gap: 10px;
  margin-top: 24px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.post-content { padding-top: 42px; }

.post-content h2 {
  margin: 2.6em 0 0.7em;
  color: var(--navy);
  font-size: 1.7rem;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.post-content p,
.post-content ul,
.post-content ol { margin: 1.15em 0; }

.post-content li + li { margin-top: 0.35em; }

.post-content blockquote {
  margin: 2em 0;
  padding: 4px 0 4px 24px;
  border-left: 3px solid var(--accent);
  color: var(--navy);
  font-size: 1.15rem;
}

.post-content code {
  padding: 0.12em 0.32em;
  border-radius: 3px;
  color: var(--accent-dark);
  background: #e8efec;
  font-family: var(--mono);
  font-size: 0.88em;
}

.post-content pre {
  overflow-x: auto;
  margin: 1.8em 0;
  padding: 24px;
  border-radius: 8px;
  background: var(--code-bg);
  box-shadow: 0 18px 42px rgba(11, 39, 57, 0.12);
}

.post-content pre code {
  padding: 0;
  color: var(--code-ink);
  background: transparent;
  font-size: 0.8rem;
  line-height: 1.65;
}

.post-content table {
  width: 100%;
  margin: 2em 0;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.post-content th,
.post-content td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.post-content th {
  color: var(--navy);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.post-content img,
.post-figure img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin: 2em auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 16px 38px rgba(11, 39, 57, 0.1);
}

.post-figure { margin: 2.4em 0; }

.post-figure img { margin-bottom: 0; }

.post-figure figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-align: center;
}

.post-footer {
  margin-top: 70px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

.back-link { display: inline-block; margin-top: 16px; font-weight: 600; text-decoration: none; }

.page {
  max-width: 760px;
  min-height: 65vh;
  padding: 96px 0;
}

.page h1 { margin-bottom: 40px; font-size: clamp(2.4rem, 6vw, 4.5rem); }

.not-found { min-height: 68vh; padding: 120px 0; }

.not-found h1 { max-width: 680px; font-size: clamp(2.3rem, 6vw, 4.4rem); }

.not-found > p:not(.error-code) { color: var(--muted); }

.button {
  display: inline-block;
  margin-top: 18px;
  padding: 11px 17px;
  border-radius: 4px;
  color: white;
  background: var(--accent-dark);
  font-weight: 600;
  text-decoration: none;
}

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

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.footer-inner {
  min-height: 110px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .shell { width: min(100% - 28px, 1120px); }
  .header-inner { min-height: 70px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 5px; }
  .site-nav { gap: 20px; }
  .hero { padding: 82px 0 72px; }
  .note-card { grid-template-columns: 1fr; gap: 12px; }
  .read-link { margin-top: 4px; }
  .post { padding: 68px 0 82px; }
  .post-content table { display: block; overflow-x: auto; }
  .post-content pre { margin-inline: -8px; padding: 18px; }
  .footer-inner { align-items: flex-start; flex-direction: column; justify-content: center; gap: 0; }
}