:root {
  color-scheme: light;
  --bg: #0f172a;
  --page-bg: #c9cdd3;
  --card: #dee1e6;
  --text: #1e2732;
  --muted: #525b68;
  --primary: #2563eb;
  --link: #1d4ed8;
  --border: #aeb4bd;
  --input-bg: #e8eaed;
  --input-text: #1e2732;
  --panel-soft: #d0d4d9;
  --error: #dc2626;
  --ok: #16a34a;
}
html[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #0b1220;
  --card: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: #334155;
  --input-bg: #0f172a;
  --input-text: #f1f5f9;
  --panel-soft: #0f172a;
  --link: #93c5fd;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--page-bg);
  color: var(--text);
  min-height: 100vh;
}
a, a:visited { color: var(--link); }
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  color: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,.25);
}
.topbar-main {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 20px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #fff; }
.brand:visited { color: #fff; }
.brand img { width: 40px; height: 40px; object-fit: contain; }
.brand strong { font-size: 18px; letter-spacing: .02em; }
.brand small { color: #94a3b8; font-size: 11px; display: block; }
.topbar-actions { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.theme-btn {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  color: #e2e8f0;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
}
.theme-btn:hover { background: rgba(255,255,255,.15); }
.wrap { max-width: 1100px; margin: 0 auto; padding: 24px 20px 60px; }
.hero {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  margin: 20px 0;
}
.hero h1 { margin: 0 0 8px; font-size: 30px; }
.hero p { margin: 6px 0; color: var(--muted); }
.search-box { margin: 18px 0 6px; }
.search-box input {
  width: 100%;
  padding: 13px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  color: var(--input-text);
  font-size: 16px;
}
.search-meta { color: var(--muted); font-size: 13px; min-height: 20px; margin: 6px 2px 0; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
  margin-top: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  text-decoration: none;
  color: inherit;
  display: grid;
  gap: 8px;
}
.card:hover { border-color: var(--primary); }
.card:visited { color: inherit; }
.card h3 { margin: 0; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  font-size: 12px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2px 9px;
  color: var(--muted);
}
.cat { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--primary); }
.empty {
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 22px;
  text-align: center;
  color: var(--muted);
  margin-top: 14px;
}
.article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  margin-top: 20px;
  line-height: 1.65;
}
.article h1 { margin-top: 0; }
.article h2 { margin-top: 28px; border-top: 1px solid var(--border); padding-top: 16px; }
.article code { background: var(--panel-soft); padding: 2px 6px; border-radius: 6px; font-size: 14px; }
.article pre {
  background: var(--panel-soft);
  padding: 14px;
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.article table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; }
.article th, .article td { border-bottom: 1px solid var(--border); padding: 9px 10px; text-align: left; }
.article th { background: var(--panel-soft); font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; }
.note { border-left: 4px solid var(--primary); background: var(--panel-soft); padding: 10px 14px; border-radius: 0 10px 10px 0; }
.warn { border-left: 4px solid #f59e0b; background: var(--panel-soft); padding: 10px 14px; border-radius: 0 10px 10px 0; }
.back { display: inline-block; margin-top: 4px; font-size: 14px; }
.steps { display: grid; gap: 10px; }
.step { border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; background: var(--panel-soft); }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 26px 12px 40px; }
kbd { background: var(--panel-soft); border: 1px solid var(--border); border-radius: 6px; padding: 1px 6px; font-size: 13px; }
@media (max-width: 640px) {
  .hero h1 { font-size: 24px; }
  .article { padding: 20px; }
  .brand small { display: none; }
}