/* static-blog — style.css
   Pure HTML5 + CSS3. No external resources.
   ========================================= */

/* ── Custom Properties ───────────────────────────────────────────── */

:root {
  --bg:        #0d0d0d;
  --surface:   #141414;
  --border:    #2a2a2a;
  --text:      #e0e0e0;
  --muted:     #606060;
  --accent:    #00ff88;
  --code-bg:   #1a1a1a;
  --code-text: #c9d1d9;
  --danger:    #ff4444;
  --warning:   #ffaa00;
  --note:      #4da6ff;

  --font-mono:
    'Berkeley Mono', 'Iosevka', 'Cascadia Code', 'JetBrains Mono',
    ui-monospace, 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;

  --font-prose: 'Newsreader', Georgia, 'Charter', ui-serif, serif;

  --width:  72ch;
  --radius: 3px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #f8f8f8;
    --surface:   #efefef;
    --border:    #d0d0d0;
    --text:      #111111;
    --muted:     #777777;
    --accent:    #007a44;
    --code-bg:   #e8e8e8;
    --code-text: #24292e;
    --danger:    #cc0000;
    --warning:   #b86800;
    --note:      #0050cc;
  }
}

/* ── Reset ───────────────────────────────────────────────────────── */

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

/* ── Base ────────────────────────────────────────────────────────── */

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  line-height: 1.7;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ── Skip Link ───────────────────────────────────────────────────── */

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.4rem 0.9rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-decoration: none;
  z-index: 9999;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 1rem;
}

/* ── Global Links ────────────────────────────────────────────────── */

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

a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
  text-decoration: none;
}

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

.site-header,
.site-footer,
.site-main {
  width: 100%;
  max-width: calc(var(--width) + 4rem);
  margin-inline: auto;
  padding-inline: 2rem;
}

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

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

.site-header {
  padding-block: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-name {
  color: var(--text);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}

.site-name::before {
  content: '$ ';
  color: var(--accent);
}

.site-name:hover {
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin-left: auto;
}

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

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--accent);
  text-decoration: none;
}

/* ── Post Listing ────────────────────────────────────────────────── */

.listing-intro {
  color: var(--muted);
  font-size: 0.8125rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  line-height: 1.6;
}

.listing-intro strong {
  color: var(--text);
}

.post-list {
  list-style: none;
}

.post-item {
  display: grid;
  grid-template-columns: 10ch 1fr auto;
  column-gap: 1.5rem;
  align-items: center;
  padding-block: 0.6rem;
  border-bottom: 1px solid var(--border);
}

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

.post-date {
  color: var(--muted);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.post-title {
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.4;
  transition: color 0.15s ease;
}

.post-title:hover {
  color: var(--accent);
  text-decoration: none;
}

.post-tags {
  display: flex;
  gap: 0.3rem;
  flex-wrap: nowrap;
  justify-content: flex-end;
}

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

.tag {
  color: var(--muted);
  font-size: 0.6875rem;
  border: 1px solid var(--border);
  padding: 0.1em 0.45em;
  border-radius: var(--radius);
  white-space: nowrap;
  line-height: 1.7;
}

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

.site-footer {
  padding-block: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  color: var(--muted);
  font-size: 0.75rem;
}

.footer-nav {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin-left: auto;
}

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

.footer-nav a:hover {
  color: var(--text);
  text-decoration: none;
}

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

@media (max-width: 640px) {
  .site-header,
  .site-footer,
  .site-main {
    padding-inline: 1.25rem;
  }

  .post-item {
    grid-template-columns: 10ch 1fr;
    grid-template-rows: auto auto;
    row-gap: 0.2rem;
    padding-block: 0.75rem;
  }

  .post-tags {
    grid-column: 2;
    justify-content: flex-start;
    padding-bottom: 0.15rem;
  }
}

@media (max-width: 420px) {
  .post-item {
    grid-template-columns: 1fr;
  }

  .post-date {
    font-size: 0.75rem;
  }

  .post-tags {
    grid-column: 1;
  }
}

/* ══════════════════════════════════════════════════════════════════
   POST PAGE STYLES
   ══════════════════════════════════════════════════════════════════ */

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

.post-header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  font-size: 1.375rem;
  line-height: 1.3;
  margin-bottom: 0.9rem;
  letter-spacing: -0.02em;
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

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

/* ── Post Body ───────────────────────────────────────────────────── */

.post-body {
  font-family: var(--font-prose);
  font-size: 1rem;
  line-height: 1.85;
}

.post-body h2,
.post-body h3,
.post-body h4 {
  font-family: var(--font-mono);
  line-height: 1.3;
  margin-top: 2.5rem;
  margin-bottom: 0.65rem;
}

.post-body h2 {
  font-size: 1.0625rem;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}

.post-body h3 {
  font-size: 0.9375rem;
  color: var(--text);
}

.post-body h4 {
  font-size: 0.875rem;
  color: var(--muted);
}

.post-body p {
  margin-bottom: 1.25rem;
}

.post-body a {
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

.post-body ul,
.post-body ol {
  padding-left: 1.75rem;
  margin-bottom: 1.25rem;
}

.post-body li {
  margin-bottom: 0.3rem;
}

.post-body code {
  font-family: var(--font-mono);
  font-size: 0.84em;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 0.1em 0.38em;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.post-body pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  font-size: 0.8125rem;
  line-height: 1.65;
  tab-size: 4;
}

.post-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  color: var(--code-text);
}

/* Language label: <pre data-lang="c"> */
.post-body pre[data-lang]::before {
  content: attr(data-lang);
  display: block;
  color: var(--muted);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}

.post-body blockquote {
  border-left: 3px solid var(--border);
  margin-block: 1.5rem;
  padding: 0.6rem 1.25rem;
  color: var(--muted);
  font-style: italic;
}

.post-body blockquote.note {
  border-left-color: var(--note);
  background: color-mix(in srgb, var(--note) 7%, transparent);
  color: var(--text);
  font-style: normal;
}

.post-body blockquote.warning {
  border-left-color: var(--warning);
  background: color-mix(in srgb, var(--warning) 7%, transparent);
  color: var(--text);
  font-style: normal;
}

.post-body blockquote.danger {
  border-left-color: var(--danger);
  background: color-mix(in srgb, var(--danger) 7%, transparent);
  color: var(--text);
  font-style: normal;
}

.post-body blockquote > p:last-child {
  margin-bottom: 0;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  margin-bottom: 1.5rem;
  display: block;
  overflow-x: auto;
}

.post-body th,
.post-body td {
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
}

.post-body th {
  background: var(--surface);
  color: var(--muted);
  font-weight: 600;
}

.post-body tr:hover td {
  background: var(--surface);
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin-block: 2.5rem;
}

.post-body details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.post-body summary {
  cursor: pointer;
  color: var(--accent);
  list-style: none;
  user-select: none;
}

.post-body summary::before { content: '▶  '; font-size: 0.6rem; vertical-align: middle; }
.post-body details[open] > summary::before { content: '▼  '; }

.post-body details[open] {
  padding-bottom: 1rem;
}

.post-body details > *:not(summary) {
  margin-top: 0.75rem;
}

/* ── Table of Contents ───────────────────────────────────────────── */

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.8125rem;
}

.toc-title {
  color: var(--muted);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin-bottom: 0.6rem;
  font-family: var(--font-mono);
}

.toc ol {
  padding-left: 1.1rem;
  line-height: 2;
  font-family: var(--font-mono);
}

.toc a {
  color: var(--muted);
  transition: color 0.15s ease;
}

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

/* ── :target highlight ───────────────────────────────────────────── */

:target {
  scroll-margin-top: 2rem;
}

.post-body h2:target,
.post-body h3:target {
  color: var(--accent);
}

/* ── Print ───────────────────────────────────────────────────────── */

@media print {
  :root {
    --bg:        #fff;
    --surface:   #f5f5f5;
    --border:    #ccc;
    --text:      #000;
    --muted:     #555;
    --accent:    #000;
    --code-bg:   #f5f5f5;
    --code-text: #111;
  }

  .site-header,
  .site-footer,
  .toc,
  .skip-link {
    display: none !important;
  }

  body { font-size: 11pt; line-height: 1.6; }

  a[href]::after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: #555;
    word-break: break-all;
  }

  pre {
    white-space: pre-wrap;
    word-break: break-word;
    border-left-color: #ccc !important;
  }
}