:root {
  --ink: #172033;
  --muted: #637087;
  --line: #e4e9f1;
  --surface: #ffffff;
  --soft: #f5f7fb;
  --brand: #2864dc;
  --brand-dark: #1744a4;
  --warm: #fff7e8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font: 16px/1.7 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar {
  align-items: center;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  padding: 16px clamp(20px, 5vw, 72px);
  position: sticky;
  top: 0;
  z-index: 2;
}

.brand { align-items: center; color: var(--ink); display: flex; font-size: 1.2rem; font-weight: 800; gap: 10px; text-decoration: none; }
.python-logo { height: 34px; width: 34px; }
.topbar nav { display: flex; gap: 22px; }
.topbar nav a, .sidebar a { color: var(--muted); text-decoration: none; }
.topbar nav a:hover, .sidebar a:hover { color: var(--brand); }

.layout { display: grid; grid-template-columns: 250px minmax(0, 850px); gap: 34px; margin: 0 auto; max-width: 1200px; padding: 34px 24px 70px; }
.sidebar { align-self: start; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; position: sticky; top: 88px; }
.sidebar-title { color: var(--ink); font-size: .82rem; font-weight: 800; letter-spacing: .08em; margin: 0 0 10px; text-transform: uppercase; }
.sidebar a { display: block; font-size: .92rem; padding: 5px 0; }
.content { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; min-height: 70vh; padding: clamp(24px, 5vw, 56px); }
.loading { color: var(--muted); }

h1 { font-size: clamp(2rem, 4vw, 3rem); line-height: 1.15; margin-top: 0; }
h2 { border-bottom: 1px solid var(--line); line-height: 1.25; margin-top: 2.2em; padding-bottom: .3em; }
h3 { margin-top: 1.8em; }
a { color: var(--brand); }
blockquote { background: var(--warm); border-left: 4px solid #f1b64c; margin-left: 0; padding: 10px 18px; }
pre { background: #172033; border-radius: 10px; color: #f4f7fb; overflow-x: auto; padding: 16px; }
code { background: #eef2f8; border-radius: 4px; padding: 2px 5px; }
pre code { background: transparent; padding: 0; }
table { border-collapse: collapse; display: block; margin: 18px 0; max-width: 100%; overflow-x: auto; }
th, td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
th { background: var(--soft); }
details { background: #f8faff; border: 1px solid #dce6fb; border-radius: 9px; margin: 14px 0; padding: 10px 14px; }
summary { color: var(--brand-dark); cursor: pointer; font-weight: 700; }
.footer { color: var(--muted); font-size: .9rem; padding: 0 24px 30px; text-align: center; }

@media (max-width: 760px) {
  .topbar { align-items: flex-start; flex-direction: column; gap: 8px; position: static; }
  .topbar nav { flex-wrap: wrap; gap: 8px 16px; }
  .layout { display: block; padding: 18px 12px 50px; }
  .sidebar { margin-bottom: 16px; position: static; }
  .sidebar a { display: inline-block; margin-right: 12px; }
  .content { padding: 24px 18px; }
}