@font-face {
  font-family: "JetBrains Mono";
  src: url("/fonts/JetBrainsMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/fonts/JetBrainsMono-Medium.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/fonts/JetBrainsMono-Bold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #1c2e28;
  --color-text: #f0faf6;
  --color-heading: #5fffa8;
  --color-muted: #a8d4c4;
  --color-border: #2e4a40;
  --color-accent: #5fffa8;
  --font: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --max-width: 680px;
  --spacing: 1.5rem;
}

html {
  font-size: 17px;
  line-height: 1.65;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing) 0;
}

header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--color-heading);
}

nav {
  display: flex;
  gap: 1.5rem;
}

nav a {
  font-size: 0.85rem;
  color: var(--color-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.1s;
}

nav a:hover,
nav a.active {
  color: var(--color-heading);
}

nav a.active {
  font-weight: 500;
}

/* ── Main ── */
main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem var(--spacing) 4rem;
  width: 100%;
}

/* ── Prose ── */
.page-header {
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 0.4rem;
  color: var(--color-heading);
}

.page-header .subtitle {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.prose h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 0.4rem;
  color: var(--color-heading);
}

.prose h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--color-heading);
}

.prose h3 {
  font-size: 1rem;
  font-weight: 500;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-heading);
}

.prose p {
  margin-bottom: 1.2rem;
  color: var(--color-text);
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--color-muted);
}

.prose ul,
.prose ol {
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
  color: var(--color-text);
}

.prose li {
  margin-bottom: 0.3rem;
}

.prose blockquote {
  border-left: 2px solid var(--color-border);
  padding-left: 1rem;
  color: var(--color-muted);
  margin-bottom: 1.2rem;
}

.prose code {
  font-family: var(--font);
  font-size: 0.9em;
  background: #0e1e1a;
  padding: 0.1em 0.3em;
  border-radius: 2px;
}

.prose pre {
  background: #0e1e1a;
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1.2rem;
  border: 1px solid var(--color-border);
}

.prose pre code {
  background: none;
  padding: 0;
}

/* ── TOC ── */
.toc {
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
  font-size: 0.85rem;
}

.toc summary {
  color: var(--color-muted);
  cursor: pointer;
  user-select: none;
  letter-spacing: 0.01em;
}

.toc summary:hover {
  color: var(--color-text);
}

.toc ul {
  margin: 0.75rem 0 0 0;
  padding-left: 1rem;
  list-style: none;
}

.toc li {
  margin-bottom: 0.3rem;
}

.toc a {
  color: var(--color-muted);
  text-decoration: none;
}

.toc a:hover {
  color: var(--color-text);
}

/* ── Page meta ── */
.page-meta {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: 1.5rem;
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing) 0;
}

footer .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

footer .copy {
  font-size: 0.8rem;
  color: var(--color-muted);
}

footer nav {
  gap: 1rem;
}

footer nav a {
  font-size: 0.8rem;
}

/* ── Mobile ── */
@media (max-width: 500px) {
  main {
    padding-top: 2rem;
  }
}