/* ─── Variables ─────────────────────────────────────────────── */
:root {
  --bg:          #ffffff;
  --bg-alt:      #f5f5f5;
  --text:        #0a0a0a;
  --text-muted:  #737373;
  --accent:      #2563eb;
  --accent-hover:#1d4ed8;
  --border:      #e5e5e5;
  --link:        #2563eb;
  --code-bg:     #111111;
  --code-text:   #e4e4e7;
  --inline-code: #f4f4f5;
  --radius:      3px;
  --max-w:       680px;
  --font-sans:   'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:   'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --transition:  0.15s ease;
}

[data-theme="dark"] {
  --bg:          #0a0a0a;
  --bg-alt:      #141414;
  --text:        #fafafa;
  --text-muted:  #737373;
  --border:      #262626;
  --link:        #60a5fa;
  --accent:      #60a5fa;
  --accent-hover:#93c5fd;
  --code-bg:     #111111;
  --code-text:   #e4e4e7;
  --inline-code: #1e1e1e;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--link);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-hover); }

/* ─── Layout ─────────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── Header / Nav ───────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 100;
  transition: background var(--transition), border-color var(--transition);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
  letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--text-muted); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0.01em;
  text-decoration: none;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition);
  margin-left: 0.5rem;
}
.theme-toggle:hover { color: var(--text); }

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

/* ─── Home Page ──────────────────────────────────────────────── */
.home-hero {
  padding: 5rem 0 3.5rem;
}

.home-hero h1 {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: 1rem;
}

.home-hero .tagline {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.65;
  max-width: 500px;
  margin-bottom: 2rem;
}

.home-hero .tagline strong {
  color: var(--text);
  font-weight: 500;
}

.home-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.home-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
}
.home-links a:hover {
  color: var(--text);
}
.home-links .link-primary {
  color: var(--text);
  font-weight: 500;
}
.home-links .link-primary:hover {
  color: var(--accent);
}

/* ─── Section headings ───────────────────────────────────────── */
.section-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  padding-top: 3rem;
}

/* ─── Post List ──────────────────────────────────────────────── */
.post-list {
  list-style: none;
  padding: 0;
  border-top: 1px solid var(--border);
}

.post-list-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
}

.post-list-title {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--text);
  text-decoration: none;
  flex: 1;
  transition: color var(--transition);
}
.post-list-title:hover {
  color: var(--accent);
}

.post-list-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ─── Post / Page ────────────────────────────────────────────── */
.post, .page {
  padding: 3.5rem 0 5rem;
}

.post-header, .page-header {
  margin-bottom: 3rem;
}

.post-title, .page h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.75rem;
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.post-meta-sep { color: var(--border); }

.tag {
  background: var(--bg-alt);
  color: var(--text-muted);
  padding: 0.1em 0.45em;
  border-radius: var(--radius);
  font-size: 0.75em;
  font-family: var(--font-mono);
}

/* ─── Prose ──────────────────────────────────────────────────── */
.post-content,
.page-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.post-content > * + *,
.page-content > * + * { margin-top: 1.5em; }

.post-content h2, .post-content h3, .post-content h4,
.page-content  h2, .page-content  h3, .page-content  h4 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-top: 2.5em;
  margin-bottom: 0.5em;
  color: var(--text);
}
.post-content h2, .page-content h2 { font-size: 1.2rem; }
.post-content h3, .page-content h3 { font-size: 1.05rem; }

.post-content a,
.page-content  a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.post-content a:hover,
.page-content  a:hover {
  color: var(--accent-hover);
}

.post-content blockquote,
.page-content  blockquote {
  border-left: 2px solid var(--border);
  padding: 0.25em 1.25em;
  margin-left: 0;
  color: var(--text-muted);
}

.post-content ul,  .post-content ol,
.page-content ul,  .page-content ol {
  padding-left: 1.4em;
}
.post-content li + li,
.page-content li + li { margin-top: 0.4em; }

.post-content hr,
.page-content  hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

/* inline code */
.post-content code,
.page-content  code {
  font-family: var(--font-mono);
  font-size: 0.825em;
  background: var(--inline-code);
  padding: 0.15em 0.35em;
  border-radius: var(--radius);
}

/* code blocks — always dark, terminal feel */
.post-content pre,
.page-content  pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1.25em 1.5em;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.65;
  margin: 1.75em 0;
}
.post-content pre code,
.page-content  pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

/* tables */
.post-content table,
.page-content  table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.post-content th,
.page-content  th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  padding: 0.5em 0.75em;
  text-align: left;
}
.post-content td,
.page-content  td {
  padding: 0.6em 0.75em;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.post-content tr:last-child td,
.page-content  tr:last-child td {
  border-bottom: none;
}

/* ─── Post Footer ────────────────────────────────────────────── */
.post-footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.back-link {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-decoration: none;
}
.back-link:hover { color: var(--text); }

/* ─── Blog index page ────────────────────────────────────────── */
.blog-page {
  padding: 3.5rem 0;
}
.blog-page h1 {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}
.blog-page .subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

/* ─── Now / generic page ─────────────────────────────────────── */
.now-page { padding: 3.5rem 0; }

.page-header h1 {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 0;
  letter-spacing: -0.02em;
}

/* ─── Footer ─────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}
.footer-links a { color: var(--text-muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); }

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 600px) {
  .nav-links { gap: 1rem; }
  .home-hero { padding: 3rem 0 2.5rem; }
  .post-list-item { flex-direction: column; gap: 0.15rem; }
  .post-list-date { font-size: 0.7rem; }
  .home-links { gap: 1.25rem; }
}