/* SaaS Blog Enterprise Theme (SSR-friendly, minimal, fast)
   Notes:
   - Neutral palette, typography-first
   - GitHub-style code blocks
   - 2-column post layout with sticky sidebar
*/

:root{
  --bg: #ffffff;
  --bg-soft: #fbfbfc;
  --text: #0f172a;
  --muted: #475569;
  --muted-2:#64748b;
  --border:#e5e7eb;
  --border-2:#dbe1ea;
  --card:#ffffff;
  --shadow: 0 1px 2px rgba(15,23,42,.06);
  --shadow-2: 0 10px 30px rgba(15,23,42,.08);
  --radius: 12px;
  --radius-sm: 10px;
  --radius-xs: 8px;
  --accent: #2563eb;
  --accent-2:#1d4ed8;
  --success:#16a34a;
  --warn:#f59e0b;
  --danger:#ef4444;

  --container: 1180px;
  --content: 720px;
  --sidebar: 300px;

  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --fz: 16px;
  --lh: 1.72;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:var(--font);
  font-size:var(--fz);
  line-height:var(--lh);
  color:var(--text);
  background:var(--bg);
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}

a{ color:var(--accent); text-decoration:none; }
a:hover{ text-decoration:underline; }
small, .muted{ color:var(--muted); }
hr{ border:0; border-top:1px solid var(--border); margin:24px 0; }

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

.topbar{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter:saturate(180%) blur(10px);
  background:rgba(255,255,255,.88);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:64px;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-weight:700; color:var(--text);
}
.brand-badge{
  width:28px; height:28px;
  border-radius:10px;
  background:linear-gradient(135deg, var(--accent), #60a5fa);
  box-shadow:var(--shadow);
}
.nav-links{ display:flex; align-items:center; gap:16px; }
.nav-links a{ color:var(--muted); font-weight:600; font-size:14px; }
.nav-links a:hover{ color:var(--text); text-decoration:none; }
.nav-actions{ display:flex; align-items:center; gap:10px; }
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:8px;
  height:36px;
  padding:0 12px;
  border-radius:10px;
  border:1px solid var(--border);
  background:var(--card);
  color:var(--text);
  font-weight:700;
  font-size:13px;
  box-shadow:var(--shadow);
  cursor:pointer;
}
.btn:hover{ border-color:var(--border-2); box-shadow:var(--shadow-2); text-decoration:none; }
.btn.primary{
  background:var(--accent);
  border-color:var(--accent);
  color:#fff;
}
.btn.primary:hover{ background:var(--accent-2); border-color:var(--accent-2); }
.btn.ghost{
  background:transparent;
  box-shadow:none;
}
.btn.ghost:hover{ background:var(--bg-soft); }

.search-mini{
  display:flex; align-items:center;
  height:36px;
  border:1px solid var(--border);
  border-radius:10px;
  padding:0 10px;
  gap:8px;
  background:var(--card);
}
.search-mini input{
  border:0; outline:none; width:220px;
  font-size:13px;
}
.kbd{
  font-family:var(--mono);
  font-size:11px;
  border:1px solid var(--border);
  padding:2px 6px;
  border-radius:8px;
  color:var(--muted);
  background:var(--bg-soft);
}

.hero{
  padding:48px 0 22px;
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.4fr .9fr;
  gap:24px;
  align-items:stretch;
}
.hero h1{
  margin:0;
  font-size:44px;
  line-height:1.08;
  letter-spacing:-.02em;
}
.hero p{
  margin:12px 0 0;
  color:var(--muted);
  max-width:60ch;
  font-size:17px;
}
.hero-cta{ display:flex; gap:10px; margin-top:18px; flex-wrap:wrap; }
.hero-card{
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:linear-gradient(180deg, #fff, var(--bg-soft));
  box-shadow:var(--shadow);
  padding:18px;
}
.hero-card h3{ margin:0 0 10px; font-size:14px; color:var(--muted); text-transform:uppercase; letter-spacing:.08em; }
.trending-item{ padding:10px 0; border-top:1px solid var(--border); }
.trending-item:first-of-type{ border-top:0; }
.trending-item a{ color:var(--text); font-weight:800; display:block; }
.trending-item small{ display:block; margin-top:4px; }

.section{
  padding:18px 0 54px;
}
.section-title{
  display:flex; align-items:baseline; justify-content:space-between;
  gap:16px;
  margin:0 0 14px;
}
.section-title h2{
  margin:0;
  font-size:18px;
  letter-spacing:-.01em;
}
.section-title a{ font-size:13px; font-weight:800; }

.grid3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:16px;
}
.card{
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--card);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.card:hover{ border-color:var(--border-2); box-shadow:var(--shadow-2); }
.card-body{ padding:14px; }
.badge{
  display:inline-flex; align-items:center;
  height:22px;
  padding:0 8px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--bg-soft);
  font-size:11px;
  font-weight:800;
  color:var(--muted);
}
.badge.featured{ border-color:#bfdbfe; background:#eff6ff; color:#1d4ed8; }
.meta{
  display:flex; flex-wrap:wrap; gap:10px;
  color:var(--muted);
  font-size:13px;
}
.title{
  margin:8px 0 8px;
  font-size:16px;
  letter-spacing:-.01em;
  line-height:1.25;
}
.excerpt{
  margin:0;
  color:var(--muted);
  font-size:14px;
  line-height:1.5;
}
.tagrow{ display:flex; flex-wrap:wrap; gap:6px; margin-top:10px; }
.tag{
  display:inline-flex; align-items:center;
  height:22px;
  padding:0 8px;
  border-radius:999px;
  border:1px solid var(--border);
  color:var(--muted);
  font-size:12px;
  background:#fff;
}

.list{
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  background:var(--card);
  box-shadow:var(--shadow);
}
.row{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:14px;
  padding:14px 14px;
  border-top:1px solid var(--border);
}
.row:first-child{ border-top:0; }
.row:hover{ background:var(--bg-soft); }
.row .left{ min-width:0; }
.row .right{ display:flex; align-items:center; gap:10px; flex-shrink:0; }
.row a{ color:var(--text); font-weight:900; display:block; text-decoration:none; }
.row a:hover{ text-decoration:underline; }
.row .sub{ margin-top:6px; color:var(--muted); font-size:14px; display:-webkit-box; -webkit-line-clamp:1; -webkit-box-orient:vertical; overflow:hidden; }
.row .meta{ margin-top:8px; }

.controls{
  position:sticky;
  top:64px;
  z-index:40;
  background:rgba(255,255,255,.92);
  border-bottom:1px solid var(--border);
  padding:12px 0;
  backdrop-filter:saturate(180%) blur(10px);
}
.controls-inner{
  display:flex; flex-wrap:wrap;
  align-items:center; gap:10px;
}
.input{
  height:36px;
  border:1px solid var(--border);
  border-radius:10px;
  padding:0 12px;
  min-width:240px;
  outline:none;
}
.select{
  height:36px;
  border:1px solid var(--border);
  border-radius:10px;
  padding:0 10px;
  background:#fff;
}

.pagination{
  display:flex; gap:8px; align-items:center; justify-content:center;
  margin-top:18px;
}
.page{
  height:34px; min-width:34px;
  padding:0 10px;
  display:inline-flex; align-items:center; justify-content:center;
  border:1px solid var(--border);
  border-radius:10px;
  background:#fff;
  font-weight:800;
  font-size:13px;
  color:var(--text);
}
.page:hover{ background:var(--bg-soft); text-decoration:none; }
.page.active{ background:var(--text); color:#fff; border-color:var(--text); }

.breadcrumbs{
  display:flex; flex-wrap:wrap; gap:8px;
  font-size:13px;
  color:var(--muted);
  margin-top:22px;
}
.breadcrumbs a{ color:var(--muted); font-weight:800; }
.breadcrumbs .sep{ opacity:.6; }

.post-header{
  padding:8px 0 10px;
}
.post-title{
  margin:8px 0 10px;
  font-size:44px;
  line-height:1.08;
  letter-spacing:-.02em;
  max-width: calc(var(--content) + 60px);
}
.post-meta{
  display:flex; flex-wrap:wrap; gap:10px;
  color:var(--muted);
  font-size:13px;
  align-items:center;
}
.hero-img{
  margin:18px 0 18px;
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--border);
  background:var(--bg-soft);
}
.hero-img img{ display:block; width:100%; height:auto; }

.post-grid{
  display:grid;
  grid-template-columns: minmax(0, var(--content)) var(--sidebar);
  gap:34px;
  align-items:start;
}
.article{
  min-width:0;
}
.sidebar{
  position:relative;
}
.sticky{
  position:sticky;
  top:92px;
  display:flex;
  flex-direction:column;
  gap:14px;
}
.panel{
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:#fff;
  box-shadow:var(--shadow);
  padding:14px;
}
.panel h4{
  margin:0 0 10px;
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--muted);
}
.toc a{
  display:block;
  padding:6px 8px;
  border-radius:10px;
  color:var(--muted);
  font-weight:700;
  font-size:13px;
  text-decoration:none;
}
.toc a:hover{ background:var(--bg-soft); color:var(--text); }
.toc a.active{ background:#eef2ff; color:#1d4ed8; border:1px solid #c7d2fe; }

.ad-slot{
  border:1px dashed var(--border-2);
  border-radius:var(--radius);
  background:linear-gradient(180deg, #fff, var(--bg-soft));
  min-height:250px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--muted-2);
  font-weight:800;
  font-size:13px;
  position:relative;
  overflow:hidden;
}
.ad-slot .label{
  position:absolute;
  top:10px; left:10px;
  font-size:11px;
  font-weight:900;
  letter-spacing:.08em;
  text-transform:uppercase;
  opacity:.7;
}

.content{
  max-width:var(--content);
}
.content p{ margin:14px 0; }
.content h2{
  margin:40px 0 10px;
  font-size:28px;
  letter-spacing:-.01em;
}
.content h3{
  margin:24px 0 10px;
  font-size:21px;
}
.content h4{ margin:18px 0 8px; font-size:18px; }
.content ul, .content ol{ margin:12px 0 12px 22px; }
.content li{ margin:6px 0; }
.content blockquote{
  margin:18px 0;
  padding:12px 14px;
  border-left:4px solid #c7d2fe;
  background:#eef2ff;
  border-radius:12px;
  color:#1f2937;
}
.content img{
  max-width:100%;
  height:auto;
  border-radius:12px;
  border:1px solid var(--border);
  margin:18px 0;
}
.content figure{ margin:18px 0; }
.content figcaption{ font-size:13px; color:var(--muted); margin-top:6px; }

.content pre{
  position:relative;
  margin:16px 0;
  background:#f6f8fa;
  border:1px solid #e1e4e8;
  border-radius:12px;
  padding:14px;
  overflow:auto;
  font-family:var(--mono);
  font-size:13.5px;
  line-height:1.55;
}
.content code{
  font-family:var(--mono);
  font-size:0.95em;
}
.codebar{
  position:absolute;
  top:10px; right:10px;
  display:flex; gap:8px; align-items:center;
}
.codepill{
  font-size:11px;
  font-weight:900;
  color:#334155;
  border:1px solid #e1e4e8;
  background:#ffffff;
  padding:2px 8px;
  border-radius:999px;
}
.copybtn{
  height:26px;
  padding:0 10px;
  border-radius:999px;
  border:1px solid #e1e4e8;
  background:#fff;
  font-weight:900;
  font-size:11px;
  cursor:pointer;
}
.copybtn:hover{ background:#f3f4f6; }

.section-links{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:14px;
  margin:24px 0 0;
}
.linkcard{
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:14px;
  background:#fff;
  box-shadow:var(--shadow);
}
.linkcard:hover{ box-shadow:var(--shadow-2); border-color:var(--border-2); }
.linkcard small{ display:block; margin-bottom:6px; }
.linkcard a{ color:var(--text); font-weight:900; text-decoration:none; }
.linkcard a:hover{ text-decoration:underline; }

.footer{
  border-top:1px solid var(--border);
  padding:28px 0;
  color:var(--muted);
  font-size:14px;
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap:18px;
}
.footer a{ color:var(--muted); font-weight:800; }
.footer a:hover{ color:var(--text); text-decoration:none; }
.foot-title{ font-weight:900; color:var(--text); margin-bottom:8px; }

.mobile-only{ display:none; }
.desktop-only{ display:block; }

.toc-toggle{
  display:none;
  width:100%;
  justify-content:space-between;
  align-items:center;
}

@media (max-width: 980px){
  :root{ --container: 980px; }
  .hero-grid{ grid-template-columns: 1fr; }
  .grid3{ grid-template-columns:1fr; }
  .post-grid{ grid-template-columns: 1fr; }
  .sticky{ position:static; }
  .desktop-only{ display:none; }
  .mobile-only{ display:block; }
  .toc-toggle{ display:flex; }
  .search-mini input{ width:150px; }
  .post-title{ font-size:36px; }
  .section-links{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr; }
}

@media (max-width: 520px){
  body{ font-size:15px; }
  .nav{ height:60px; }
  .search-mini{ display:none; }
  .hero h1{ font-size:34px; }
  .post-title{ font-size:32px; }
}

.mdtab.active{border-color:rgba(59,130,246,.65);box-shadow:0 0 0 3px rgba(59,130,246,.15) inset;}

@media (max-width:980px){ #mediaPickerGrid{grid-template-columns:repeat(2,minmax(0,1fr)) !important;} }

#editorDropZone{transition:border-color .15s ease, background .15s ease;}
#editorDropZone:hover{background:rgba(15,23,42,.55);}

.card{content-visibility:auto;contain-intrinsic-size:320px;}
.hero-card,.sidebar .sticky{content-visibility:auto;contain-intrinsic-size:300px;}