/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #fafafa;
  --text: #2c2c2c;
  --text-muted: #666;
  --accent: #2a7ae2;
  --accent-hover: #1756a9;
  --border: #e0e0e0;
  --code-bg: #f4f4f4;
  --blockquote-border: #4a8af4;
  --blockquote-bg: #f6f8fc;
  --tag-bg: #e8f4e8;
  --tag-color: #2d6a2d;
  --max-width: 680px;
  --font-mono: 'JetBrains Mono', 'Source Code Pro', 'Fira Code', monospace;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
}

[data-theme="dark"] {
  --bg: #1a1a2e;
  --text: #e0e0e0;
  --text-muted: #999;
  --accent: #64b5f6;
  --accent-hover: #90caf9;
  --border: #333;
  --code-bg: #252540;
  --blockquote-border: #64b5f6;
  --blockquote-bg: #1e1e36;
  --tag-bg: #1e3a1e;
  --tag-color: #7dce7d;
}

/* === TYPOGRAPHY === */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'kern' 1, 'liga' 1;
  transition: background 0.3s, color 0.3s;
}

/* === LAYOUT === */
.site-header {
  max-width: var(--max-width);
  margin: 2em auto 0;
  padding: 0 1.5em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
}
.logo img {
  max-width: 10em;
  height: 3em;
  display: block;
}
.logo:hover { text-decoration: none; }

[data-theme="dark"] .logo img {
  filter: invert(1);
}

.cursor-blink {
  color: var(--accent);
  animation: blink 1.2s step-end infinite;
  font-size: 0.9em;
  margin-left: 0.3em;
  user-select: none;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.8em;
  font-family: var(--font-mono);
  font-size: 0.82em;
}
.site-nav a {
  color: var(--text-muted);
  padding: 0.2em 0;
}
.site-nav a::before {
  content: "/";
  color: var(--border);
}
.site-nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.3em 0.6em;
  cursor: pointer;
  font-size: 14px;
  color: var(--text-muted);
  transition: all 0.2s;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.post-content {
  max-width: var(--max-width);
  margin: 2em auto;
  padding: 0 1.5em;
}

/* === LINKS === */
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* === HEADINGS === */
h1, h2, h3 {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: -0.5px;
}

.post-title {
  text-align: center;
  font-size: 1.6em;
  margin-bottom: 0.2em;
}

.post-date {
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85em;
  margin-bottom: 2em;
}

/* === HOME LIST === */
.home-ul { padding: 0; margin: 0; }

.home-li {
  list-style: none;
  padding: 1.5em 0;
  border-bottom: 1px solid var(--border);
}
.home-li:last-child { border-bottom: none; }

.home-li h2 {
  font-size: 1.2em;
  margin: 0 0 0.4em;
  line-height: 1.4;
}
.home-li h2 a { color: var(--text); }
.home-li h2 a:hover { color: var(--accent); text-decoration: none; }

.home-li p {
  color: var(--text-muted);
  font-size: 0.92em;
  margin: 0;
  line-height: 1.6;
}

.home-poster { display: none; }

/* === TAG BADGE === */
.wob {
  font-family: var(--font-mono);
  font-size: 0.7em;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  background: var(--tag-bg);
  color: var(--tag-color);
  vertical-align: middle;
}

/* === CODE === */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.15em 0.4em;
  background: var(--code-bg);
  border-radius: 3px;
  border: 1px solid var(--border);
}

pre, .post pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1em;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88em;
  line-height: 1.5;
}
pre code, .post pre code {
  background: none;
  border: none;
  padding: 0;
}

/* === BLOCKQUOTE === */
blockquote {
  border-left: 3px solid var(--blockquote-border);
  background: var(--blockquote-bg);
  margin: 1.5em 0;
  padding: 0.8em 1.2em;
  border-radius: 0 4px 4px 0;
}
blockquote p { display: inline; margin: 0; }

/* === IMAGES === */
img { max-width: 100%; height: auto; border-radius: 4px; }
.poster img { margin: 1em 0; }

/* === LISTS === */
li:not(.home-li) {
  margin: 0.3em 0;
  list-style: square;
}

/* === HR === */
hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2em 0;
}

/* === AUDIO === */
audio { width: 100%; }

/* === FOOTER === */
.footer {
  max-width: var(--max-width);
  margin: 3em auto 2em;
  padding: 0 1.5em;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85em;
}
.footer hr { margin-bottom: 1em; }
.footer i {
  position: relative;
  display: inline-block;
}
.footer img {
  display: inline-block;
  width: 6em;
  vertical-align: middle;
}

[data-theme="dark"] .footer img {
  filter: invert(1);
}

/* === KBD === */
kbd {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 0.1em 0.5em;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--code-bg);
  box-shadow: 0 1px 0 rgba(0,0,0,0.1);
}

/* === TOC === */
#markdown-toc::before {
  content: "CONTENTS";
  font-family: var(--font-mono);
  font-weight: bold;
  font-size: 0.85em;
  color: var(--text-muted);
}
#markdown-toc {
  border: 1px solid var(--border);
  border-radius: 4px;
  list-style: decimal;
  display: inline-block;
  padding: 0.7em 1.2em 0.7em 3em;
}
#markdown-toc ul { list-style: decimal; }

/* === FOOTNOTES === */
.footnotes {
  font-size: 0.9em;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 2em;
  padding-top: 1em;
}

/* === HIGHLIGHT === */
.highlighter { background-color: #B4E7F8; }
.highlighter_underline { border-bottom: 3px solid #B4E7F8; }
mark {
  background: linear-gradient(to top, #fef08a 50%, transparent 50%);
  padding: 0 2px;
}

/* === RESPONSIVE === */
@media (max-width: 700px) {
  body { font-size: 16px; }
  .post-content { padding: 0 1em; }
  .site-header { padding: 0 1em; }
  .post-title { font-size: 1.4em; }
}



/* === PAGINATION === */
.pagination {
  max-width: var(--max-width);
  margin: 2em auto;
  padding: 0 1.5em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5em;
  font-family: var(--font-mono);
  font-size: 0.85em;
}
.pagination a {
  color: var(--accent);
  padding: 0.4em 0.8em;
  border: 1px solid var(--border);
  border-radius: 4px;
}
.pagination a:hover {
  border-color: var(--accent);
  text-decoration: none;
}
.pagination .page-num {
  color: var(--text-muted);
}

/* === RELATED POSTS === */
.related-posts {
  margin-top: 3em;
  padding-top: 1.5em;
  border-top: 1px solid var(--border);
}
.related-posts h3 {
  font-size: 0.9em;
  color: var(--text-muted);
  margin-bottom: 0.8em;
}
.related-posts ul {
  padding: 0;
  list-style: none;
}
.related-posts li {
  list-style: none !important;
  margin: 0.5em 0;
  padding-left: 0;
}
.related-posts li::before {
  content: "→ ";
  color: var(--text-muted);
}
.related-posts a {
  font-size: 0.92em;
}