/* ==========================================================================
   Shawn New Blog — modern theme
   Light by default, adapts to prefers-color-scheme: dark.
   ========================================================================== */

:root {
  --bg: #f7f8fa;
  --bg-elev: #ffffff;
  --text: #1f2328;
  --text-muted: #57606a;
  --border: #e4e6eb;
  --accent: #e8553f;
  --accent-hover: #d23b27;
  --accent-soft: #fdecea;
  --code-bg: #f6f8fa;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, .08);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1080px;
  --content-width: 720px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas,
    "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-elev: #161b22;
    --text: #e6edf3;
    --text-muted: #9198a1;
    --border: #2a3038;
    --accent: #ff7b6b;
    --accent-hover: #ff9485;
    --accent-soft: #2a1a18;
    --code-bg: #1a2029;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, .4);
  }
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent-hover); }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ---- header ---- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; gap: 16px;
}
.site-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.site-brand:hover { color: var(--text); }
.site-logo { border-radius: 8px; }
.site-title { font-size: 1.05rem; letter-spacing: .2px; }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: var(--text-muted); padding: 6px 12px; border-radius: 999px;
  font-size: .92rem; font-weight: 500;
}
.site-nav a:hover { color: var(--text); background: var(--accent-soft); }
.site-nav a.active { color: var(--accent); background: var(--accent-soft); }

/* ---- hero ---- */
.hero { padding: 64px 0 40px; text-align: center; }
.hero-title { font-size: 2.6rem; margin: 0 0 12px; letter-spacing: -.5px; }
.hero-subtitle { color: var(--text-muted); font-size: 1.1rem; margin: 0; }

/* ---- feed / grid ---- */
.post-feed { padding-bottom: 40px; }
.feed-heading { display: flex; align-items: baseline; justify-content: space-between; margin: 8px 0 20px; }
.feed-heading h2 { margin: 0; font-size: 1.25rem; }
.feed-all { font-size: .9rem; font-weight: 500; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }

.post-card {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.post-card-cover { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: var(--code-bg); }
.post-card-cover img { width: 100%; height: 100%; object-fit: cover; }
.post-card-body { padding: 16px 18px 20px; display: flex; flex-direction: column; flex: 1; }
.post-card-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; font-size: .8rem; color: var(--text-muted); margin-bottom: 8px; }
.post-card-tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.post-card-tags a { background: var(--accent-soft); color: var(--accent); padding: 2px 8px; border-radius: 999px; font-size: .72rem; }
.post-card-tags a:hover { background: var(--accent); color: #fff; }
.post-card-title { font-size: 1.12rem; margin: 0 0 8px; line-height: 1.35; }
.post-card-title a { color: var(--text); }
.post-card-title a:hover { color: var(--accent); }
.post-card-summary {
  margin: 0; color: var(--text-muted); font-size: .92rem;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- compact list (taxonomy term) ---- */
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list-item { display: flex; gap: 16px; align-items: baseline; padding: 14px 4px; border-bottom: 1px solid var(--border); }
.post-list-item time { color: var(--text-muted); font-size: .85rem; flex: 0 0 92px; font-variant-numeric: tabular-nums; }
.post-list-item a { color: var(--text); font-weight: 500; }
.post-list-item a:hover { color: var(--accent); }

/* ---- page header (list pages) ---- */
.page-header { padding: 40px 0 8px; }
.page-title { margin: 0 0 8px; }
.page-content { color: var(--text-muted); }

/* ---- single post ---- */
.post { max-width: var(--content-width); padding: 40px 20px 64px; }
.post-header { text-align: center; margin-bottom: 28px; }
.post-title { font-size: 2.1rem; margin: 0 0 12px; letter-spacing: -.5px; }
.post-meta { display: inline-flex; align-items: center; gap: 12px; flex-wrap: wrap; color: var(--text-muted); font-size: .9rem; justify-content: center; }
.post-tags { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.post-tags a { background: var(--accent-soft); color: var(--accent); padding: 2px 10px; border-radius: 999px; font-size: .78rem; }
.post-tags a:hover { background: var(--accent); color: #fff; }
.post-cover { margin: 0 0 28px; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.post-cover img { width: 100%; }

/* ---- table of contents ---- */
.toc { margin: 0 0 28px; background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 4px 16px; font-size: .9rem; }
.toc summary { cursor: pointer; font-weight: 600; padding: 8px 0; color: var(--text); }
.toc nav { margin: 0 0 10px; }
.toc ul { margin: 4px 0; padding-left: 18px; }
.toc li { margin: 2px 0; }
.toc a { color: var(--text-muted); }
.toc a:hover { color: var(--accent); }

/* ---- post content typography ---- */
.post-content { font-size: 1.02rem; }
.post-content > *:first-child { margin-top: 0; }
.post-content p { margin: 0 0 1.4em; }
.post-content h2 { margin: 2em 0 .8em; padding-bottom: .3em; border-bottom: 1px solid var(--border); }
.post-content h3 { margin: 1.8em 0 .6em; }
.post-content h4 { margin: 1.6em 0 .5em; font-size: 1.05rem; }
.post-content ul, .post-content ol { margin: 0 0 1.4em; padding-left: 1.6em; }
.post-content li { margin: .35em 0; }
.post-content img { margin: 1.6em auto; border-radius: var(--radius-sm); }
.post-content blockquote {
  margin: 1.6em 0; padding: .4em 1.2em; border-left: 3px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-muted);
}
.post-content blockquote p { margin: .5em 0; }
.post-content a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.post-content a:hover { border-bottom-color: var(--accent); }
.post-content hr { border: none; border-top: 1px solid var(--border); margin: 2.4em 0; }
.post-content table { width: 100%; border-collapse: collapse; margin: 1.6em 0; font-size: .95rem; }
.post-content th, .post-content td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.post-content th { background: var(--code-bg); font-weight: 600; }
.post-content del { color: var(--text-muted); }

/* ---- code ---- */
.post-content code, .post-content pre { font-family: var(--font-mono); }
.post-content :not(pre) > code {
  background: var(--code-bg); padding: .15em .4em; border-radius: 5px;
  font-size: .88em; border: 1px solid var(--border);
}
.post-content pre {
  margin: 1.6em 0; padding: 16px 18px; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: .88rem; line-height: 1.6;
  border: 1px solid var(--border);
}
.post-content pre code { padding: 0; background: none; border: 0; font-size: inherit; }

/* ---- post navigation ---- */
.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border); }
.post-nav-item { display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg-elev); color: var(--text); }
.post-nav-item:hover { border-color: var(--accent); color: var(--text); }
.post-nav-item.post-nav-left.placeholder,
.post-nav-item.post-nav-right.placeholder { visibility: hidden; }
.post-nav-right { text-align: right; }
.post-nav-label { font-size: .78rem; color: var(--text-muted); }
.post-nav-item strong { font-size: .98rem; font-weight: 600; }

/* ---- pagination ---- */
.pagination { display: flex; justify-content: center; gap: 6px; flex-wrap: wrap; margin: 40px 0 20px; }
.page-link { min-width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center; padding: 0 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-size: .9rem; }
.page-link:hover { border-color: var(--accent); color: var(--accent); }
.page-link.current { background: var(--accent); border-color: var(--accent); color: #fff; }
.page-link.disabled { color: var(--text-muted); opacity: .5; cursor: not-allowed; }

/* ---- tag cloud ---- */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0; }
.tag { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border: 1px solid var(--border); border-radius: 999px; color: var(--text); background: var(--bg-elev); font-size: .9rem; }
.tag:hover { border-color: var(--accent); color: var(--accent); }
.tag-count { color: var(--text-muted); font-size: .78rem; }

/* ---- 404 ---- */
.error-page { text-align: center; padding: 100px 20px; }
.error-code { font-size: 6rem; font-weight: 800; color: var(--accent); margin: 0; line-height: 1; }
.error-text { font-size: 1.4rem; color: var(--text-muted); margin: 12px 0 28px; }
.btn { display: inline-block; padding: 10px 24px; background: var(--accent); color: #fff; border-radius: 999px; font-weight: 600; }
.btn:hover { background: var(--accent-hover); color: #fff; }

/* ---- footer ---- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-elev); margin-top: 40px; }
.site-footer-inner { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 28px 20px; text-align: center; color: var(--text-muted); font-size: .88rem; }
.footer-links { display: flex; gap: 16px; margin: 0; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }
.footer-powered { margin: 0; opacity: .8; }
.footer-powered a { color: var(--text-muted); border-bottom: 1px dotted currentColor; }

/* ---- responsive ---- */
@media (max-width: 768px) {
  .hero { padding: 40px 0 28px; }
  .hero-title { font-size: 2rem; }
  .post-title { font-size: 1.6rem; }
  .post-header { text-align: left; }
  .post-meta { justify-content: flex-start; }
  .site-header-inner { height: auto; padding: 10px 0; flex-wrap: wrap; }
  .site-nav { width: 100%; justify-content: flex-start; overflow-x: auto; }
  .post-list-item { flex-direction: column; gap: 2px; }
  .post-list-item time { flex: none; }
  .post-nav { grid-template-columns: 1fr; }
  .post-nav-right { text-align: left; }
  .post-nav-item.placeholder { display: none; }
}

@media (max-width: 480px) {
  .post-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.7rem; }
  .container { padding: 0 16px; }
  .post { padding: 28px 16px 48px; }
}

@media print {
  .site-header, .site-footer, .post-nav, .toc, .pagination { display: none; }
  body { background: #fff; }
}