/* Mobile-first. Dark is the default theme; [data-theme="light"] overrides the variables. */
:root,
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0f14;
  --surface: #111823;
  --surface-2: #172131;
  --border: #223046;
  --text: #d7e0ec;
  --muted: #8aa0b8;
  --accent: #3ddc97;
  --accent-2: #5ac8fa;
  --on-accent: #04130c;
  --code-bg: #0d1117;
  --glow: rgba(61, 220, 151, 0.12);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #eef2f7;
  --border: #d9e2ec;
  --text: #17212e;
  --muted: #526377;
  --accent: #067a4c;
  --accent-2: #0b6fa8;
  --on-accent: #ffffff;
  --code-bg: #f8f8f8;
  --glow: rgba(6, 122, 76, 0.08);
}

:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 10px;
  --tap: 44px;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  overflow-wrap: break-word;
}

main { flex: 1; padding-block: 1.5rem 3rem; }

a { color: var(--accent-2); text-underline-offset: 3px; }
a:hover { color: var(--accent); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

img, svg, video { max-width: 100%; height: auto; }

h1, h2, h3, h4 { font-family: var(--font-mono); line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.7rem, 6vw, 2.6rem); margin: 0 0 0.75rem; }
h2 { font-size: clamp(1.3rem, 4vw, 1.7rem); }
h3 { font-size: 1.15rem; }

.container {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: max(1rem, env(safe-area-inset-left)) max(1rem, env(safe-area-inset-right));
}

.muted { color: var(--muted); }
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 0.5rem; top: -4rem; z-index: 100;
  background: var(--accent); color: var(--on-accent); padding: 0.5rem 0.75rem; border-radius: 6px;
}
.skip-link:focus { top: 0.5rem; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  padding-top: env(safe-area-inset-top);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; flex-wrap: wrap; align-items: center; min-height: 3.5rem; }

.brand {
  display: inline-flex; align-items: center; min-height: var(--tap);
  font-family: var(--font-mono); font-weight: 700; font-size: 1.05rem;
  color: var(--text); text-decoration: none;
}
.brand-prompt { color: var(--accent); margin-right: 0.4rem; }
.cursor { color: var(--accent); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.header-actions { display: flex; gap: 0.25rem; margin-left: auto; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: var(--tap); height: var(--tap);
  background: transparent; color: var(--text);
  border: 1px solid transparent; border-radius: var(--radius);
  cursor: pointer;
}
.icon-btn:hover { background: var(--surface-2); color: var(--accent); }

[data-theme="dark"] .icon-moon,
[data-theme="light"] .icon-sun { display: none; }

.site-nav { display: flex; flex-direction: column; flex-basis: 100%; padding-bottom: 0.5rem; }
.js .site-nav { display: none; }
.js .site-header[data-nav-open="true"] .site-nav { display: flex; }
.site-nav a {
  display: flex; align-items: center; min-height: var(--tap);
  padding-inline: 0.5rem; border-radius: var(--radius);
  font-family: var(--font-mono); color: var(--text); text-decoration: none;
}
.site-nav a:hover { background: var(--surface-2); color: var(--accent); }
.site-nav a[aria-current="page"] { color: var(--accent); }
.site-nav a[aria-current="page"]::before { content: "> "; white-space: pre; }

/* Hero */
.hero {
  padding: 2rem 1rem; margin-bottom: 2.5rem;
  border: 1px solid var(--border); border-radius: calc(var(--radius) * 1.6);
  background:
    linear-gradient(var(--glow), transparent 60%),
    linear-gradient(90deg, var(--border) 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(var(--border) 1px, transparent 1px) 0 0 / 28px 28px,
    var(--surface);
}
.eyebrow { font-family: var(--font-mono); color: var(--accent); margin: 0 0 0.5rem; }
.lead { color: var(--muted); font-size: 1.1rem; max-width: 40rem; margin: 0 0 1.25rem; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: var(--tap);
  padding-inline: 1.1rem; border-radius: var(--radius);
  background: var(--accent); color: var(--on-accent);
  font-family: var(--font-mono); font-weight: 600; text-decoration: none;
  border: 1px solid var(--accent);
}
.btn:hover { color: var(--on-accent); filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-ghost:hover { background: var(--glow); color: var(--accent); }

.section-title, .page-title { font-family: var(--font-mono); }
.section-title span, .page-title span { color: var(--accent); margin-right: 0.35rem; }
.page-title { margin-top: 0; }
.more { margin-top: 1.5rem; font-family: var(--font-mono); }

/* Cards */
.grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.card {
  display: flex; flex-direction: column; gap: 0.5rem;
  padding: 1.1rem; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0; }
.card h3 a { color: var(--text); text-decoration: none; }
.card h3 a:hover { color: var(--accent); }
.card p { margin: 0; color: var(--muted); }

.meta { margin: 0; color: var(--muted); font-family: var(--font-mono); font-size: 0.85rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* Tags */
.tags { list-style: none; margin: 0.25rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag-cloud { margin-bottom: 1.5rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.35rem; min-height: 32px;
  padding: 0.1rem 0.7rem; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--accent-2); font-family: var(--font-mono); font-size: 0.85rem; text-decoration: none;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip .count { color: var(--muted); }

/* Post */
.post-header { margin-bottom: 1.5rem; }
.prose { max-width: 70ch; }
.prose h2 { margin-top: 2.2rem; }
.prose h2::before { content: "## "; color: var(--accent); }
.prose h3::before { content: "### "; color: var(--accent); }
.prose img { border-radius: var(--radius); }
.prose blockquote {
  margin: 1.25rem 0; padding: 0.25rem 1rem;
  border-left: 3px solid var(--accent); background: var(--surface); color: var(--muted);
}
.prose table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; margin: 1.25rem 0; }
.prose th, .prose td { padding: 0.5rem 0.75rem; border: 1px solid var(--border); text-align: left; }
.prose th { background: var(--surface-2); }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }

/* About page: photo above the text on phones, to the left from 640px */
.about { display: grid; gap: 1.5rem; }
.about-photo {
  width: min(100%, 14rem); height: auto; aspect-ratio: 1; object-fit: cover;
  border: 2px solid var(--accent); border-radius: var(--radius);
  box-shadow: 0 0 0 6px var(--glow);
}

:not(pre) > code {
  font-family: var(--font-mono); font-size: 0.9em;
  padding: 0.15em 0.4em; border-radius: 5px;
  background: var(--surface-2); border: 1px solid var(--border);
  overflow-wrap: anywhere;
}
.codehilite {
  margin: 1.25rem 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.codehilite pre {
  margin: 0; padding: 1rem; overflow-x: auto;
  font-family: var(--font-mono); font-size: 0.875rem; line-height: 1.55;
  -webkit-overflow-scrolling: touch;
}

.post-nav { display: grid; gap: 0.75rem; margin-top: 3rem; }
.post-nav a {
  display: flex; flex-direction: column; padding: 0.9rem 1rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); text-decoration: none;
}
.post-nav a:hover { border-color: var(--accent); }
.post-nav .muted { font-family: var(--font-mono); font-size: 0.85rem; }

/* Search */
.search-form {
  display: flex; align-items: center; gap: 0.5rem; padding-inline: 0.9rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.search-form:focus-within { border-color: var(--accent); }
.search-form .prompt { color: var(--accent); font-family: var(--font-mono); font-weight: 700; }
.search-form input {
  flex: 1; min-width: 0; min-height: 52px; background: transparent; border: 0; color: var(--text);
  font-family: var(--font-mono); font-size: 1rem; /* 16px+ stops iOS zoom on focus */
}
.search-form input:focus { outline: none; }
.results { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; gap: 0.75rem; }
.result {
  padding: 1rem; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.result h3 { margin: 0 0 0.25rem; }
.result h3 a { color: var(--text); text-decoration: none; }
.result h3 a:hover { color: var(--accent); }
.result p { margin: 0.25rem 0 0; color: var(--muted); }
mark { background: var(--glow); color: var(--accent); border-bottom: 1px solid var(--accent); padding: 0 1px; }

/* Footer */
.site-footer {
  padding-block: 1.5rem calc(1.5rem + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border); color: var(--muted); font-size: 0.9rem;
}
.site-footer p { margin: 0.25rem 0; }

/* Tablet and up */
@media (min-width: 640px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 3rem 2rem; }
  .post-nav { grid-template-columns: 1fr 1fr; }
  .post-nav .next { grid-column: 2; text-align: right; }
  .about.has-photo { grid-template-columns: 14rem 1fr; gap: 2.5rem; align-items: start; }
  .about-photo { width: 100%; }
}

@media (min-width: 720px) {
  .header-inner { flex-wrap: nowrap; gap: 1rem; }
  .nav-toggle { display: none; }
  .header-actions { order: 3; margin-left: 0; }
  .site-nav,
  .js .site-nav { display: flex; flex-direction: row; flex-basis: auto; order: 2; margin-left: auto; padding-bottom: 0; }
}

@media (min-width: 1024px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
  main { padding-top: 2.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .cursor { animation: none; }
  .card { transition: none; }
  .card:hover { transform: none; }
}