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

[hidden] { display: none !important; }

:root {
  --bg: #fafaf9;
  --fg: #1c1c1c;
  --fg-muted: #767676;
  --border: #e5e5e5;
  --accent: #2563eb;
  --max-w: 680px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Mono', 'Consolas', monospace;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ── Layout ─────────────────────────────────────── */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* ── Header ─────────────────────────────────────── */

header {
  padding: 2rem 0;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.wordmark {
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  transition: opacity 0.15s;
}

.wordmark:hover {
  opacity: 0.6;
}

nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

nav a {
  font-size: 0.8125rem;
  color: var(--fg-muted);
  transition: color 0.15s;
}

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

/* ── Main ───────────────────────────────────────── */

main {
  flex: 1;
  padding: 2rem 0 4rem;
}

/* ── Filters ────────────────────────────────────── */

.filters {
  display: flex;
  gap: 0.375rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.filters button {
  background: none;
  border: 1px solid var(--border);
  border-radius: 100px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  color: var(--fg-muted);
  transition: all 0.15s;
  line-height: 1.5;
}

.filters button:hover,
.filters button.active {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--bg);
}

/* ── Feed ───────────────────────────────────────── */

.feed {
  list-style: none;
}

.feed-item {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0 2rem;
  padding: 1.625rem 0;
  border-bottom: 1px solid var(--border);
}

.feed-item:first-child {
  border-top: 1px solid var(--border);
}

.entry-date {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--fg-muted);
  padding-top: 0.2rem;
  letter-spacing: 0.02em;
}

.entry-content {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

/* ── Tags ───────────────────────────────────────── */

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  padding: 0.1rem 0.45rem;
  border-radius: 3px;
  width: fit-content;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  line-height: 1.7;
}

.tag-blog    { background: #fef3c7; color: #92400e; }
.tag-project { background: #d1fae5; color: #065f46; }
.tag-update  { background: #dbeafe; color: #1e3a8a; }

/* ── Entry title & excerpt ──────────────────────── */

.entry-title {
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--fg);
  transition: opacity 0.15s;
}

.entry-title:hover {
  opacity: 0.55;
}

.entry-excerpt {
  font-size: 0.8125rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* ── Footer ─────────────────────────────────────── */

footer {
  padding: 1.75rem 0;
  border-top: 1px solid var(--border);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer a {
  font-size: 0.75rem;
  color: var(--fg-muted);
  transition: color 0.15s;
}

footer a:hover {
  color: var(--fg);
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

/* ── Entry page ─────────────────────────────────── */

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8125rem;
  color: var(--fg-muted);
  margin-bottom: 2rem;
  transition: color 0.15s;
}

.back-link:hover {
  color: var(--fg);
}

.entry-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.entry-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.875rem;
}

.entry-meta .entry-date {
  padding-top: 0;
}

.entry-page-title {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

/* ── Prose ──────────────────────────────────────── */

.prose {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--fg);
}

.prose p + p {
  margin-top: 1.25em;
}

.prose h2 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-top: 2.25em;
  margin-bottom: 0.6em;
  letter-spacing: -0.01em;
}

.prose h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-top: 1.75em;
  margin-bottom: 0.5em;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose a:hover {
  opacity: 0.75;
}

.prose ul,
.prose ol {
  padding-left: 1.5em;
  margin: 0.75em 0;
}

.prose li + li {
  margin-top: 0.3em;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: #efefed;
  padding: 0.125em 0.35em;
  border-radius: 3px;
}

.prose pre {
  background: #efefed;
  border-radius: 6px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5em 0;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: 0.8125rem;
}

.prose blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1.25em;
  margin: 1.5em 0;
  color: var(--fg-muted);
}

/* ── Responsive ─────────────────────────────────── */

@media (max-width: 600px) {
  .feed-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    padding: 1.375rem 0;
  }

  .entry-date {
    font-size: 0.625rem;
  }

  .entry-page-title {
    font-size: 1.25rem;
  }

  footer .container {
    flex-direction: column;
    gap: 0.875rem;
    align-items: flex-start;
  }
}