:root {
  color-scheme: dark;
  --bg: #111820;
  --panel: #17222c;
  --panel-soft: #1d2d39;
  --text: #e9f1f6;
  --muted: #9fb0bd;
  --line: #2c4150;
  --cyan: #62d9e8;
  --green: #71f79f;
  --red: #ff6961;
  --amber: #ffd166;
  --code: #0c1319;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--text);
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
}

.tools { display: flex; gap: 8px; align-items: center; }
input, button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
}
button { cursor: pointer; font-weight: 700; }

.shell {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  max-width: 1320px;
  margin: 0 auto;
  gap: 24px;
  padding: 24px;
}

.sidebar {
  position: sticky;
  top: 74px;
  height: calc(100vh - 98px);
}
.sidebar nav {
  display: grid;
  gap: 6px;
  padding: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.sidebar a {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 6px;
}
.sidebar a:hover { color: var(--text); background: var(--panel-soft); }

main { display: grid; gap: 18px; }
.canvas {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}
.hero {
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--cyan) 20%, var(--panel)), var(--panel) 58%),
    var(--panel);
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 12px; letter-spacing: 0; }
h1 { font-size: 38px; }
h2 { font-size: 26px; }
h3 { font-size: 18px; margin-top: 18px; }
p { margin: 0 0 12px; color: var(--muted); }

.badge {
  display: inline-flex;
  border: 1px solid color-mix(in srgb, var(--cyan) 50%, var(--line));
  color: var(--cyan);
  border-radius: 999px;
  padding: 4px 10px;
  font-weight: 800;
  margin-bottom: 12px;
}
.grid { display: grid; gap: 12px; margin-top: 14px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
article {
  border: 1px solid var(--line);
  background: var(--panel-soft);
  border-radius: 8px;
  padding: 14px;
}
article span { display: block; color: var(--muted); margin-top: 6px; }

.callout {
  border-left: 4px solid var(--cyan);
  background: var(--panel-soft);
  border-radius: 8px;
  padding: 12px 14px;
  color: var(--muted);
  margin-top: 14px;
}
.callout.success { border-color: var(--green); }
.callout.info { border-color: var(--cyan); }

table { width: 100%; border-collapse: collapse; overflow: hidden; border-radius: 8px; }
th, td { border: 1px solid var(--line); padding: 10px; vertical-align: top; }
th { background: var(--panel-soft); text-align: left; }
code {
  background: color-mix(in srgb, var(--cyan) 10%, transparent);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
}
pre {
  position: relative;
  background: var(--code);
  color: #eaf6f8;
  padding: 16px;
  border-radius: 8px;
  overflow: auto;
  border: 1px solid var(--line);
}
pre code { background: transparent; border: 0; padding: 0; color: inherit; }
.copy {
  position: absolute;
  right: 10px;
  top: 10px;
  background: #ffffff14;
  color: #eaf6f8;
}
.steps p {
  border-left: 3px solid var(--cyan);
  padding-left: 12px;
}
.hidden { display: none !important; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; padding: 14px; }
  .sidebar { position: static; height: auto; }
  .sidebar nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.two, .grid.three { grid-template-columns: 1fr; }
  .topbar { flex-wrap: wrap; }
  input { width: 100%; }
}