:root {
  --blue: #1a6cff;
  --blue-dark: #0f54d4;
  --blue-soft: #e8f0ff;
  --ink: #1c2433;
  --muted: #5c6578;
  --card: #ffffff;
  --line: rgba(28, 36, 51, 0.1);
  --ok: #0d7a4f;
  --ok-bg: #e8f7ef;
  --warn: #9a6700;
  --warn-bg: #fff6e0;
  --code-bg: #0f1724;
  --code-fg: #e8eef8;
  --top-h: 56px;
  --max: 860px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Nunito", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(ellipse 900px 520px at 8% -10%, rgba(26, 108, 255, 0.14), transparent 55%),
    radial-gradient(ellipse 700px 480px at 100% 0%, rgba(56, 189, 248, 0.1), transparent 50%),
    linear-gradient(140deg, #e8f2ff 0%, #f7fbff 48%, #eef8f3 100%);
}

a {
  color: var(--blue-dark);
  text-underline-offset: 2px;
}

a:hover { color: var(--blue); }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--blue);
  color: #fff;
  padding: 8px 12px;
  z-index: 100;
}

.skip:focus { left: 8px; top: 8px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--top-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-size: 1rem;
  font-weight: 800;
}

.brand-text span {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: 600;
}

.top-links {
  margin-left: auto;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  font-weight: 700;
}

.top-links a { text-decoration: none; }

.top-links a[aria-current="page"] { color: var(--blue); }

.wrap {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  padding: 28px 0 64px;
}

.hero { margin-bottom: 22px; }

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 44rem;
  line-height: 1.5;
}

.banner {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  border-radius: 16px;
  border: 1px solid rgba(13, 122, 79, 0.2);
  background: var(--ok-bg);
  margin-bottom: 22px;
}

.banner.warn {
  background: var(--warn-bg);
  border-color: rgba(154, 103, 0, 0.25);
}

.banner h2 {
  margin: 0 0 4px;
  font-size: 1.1rem;
  font-weight: 800;
}

.banner p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.section { margin-bottom: 28px; }

.section h2 {
  margin: 0 0 12px;
  font-size: 1.08rem;
  font-weight: 800;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 18px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 8px 24px rgba(28, 36, 51, 0.04);
}

.card:hover { border-color: rgba(26, 108, 255, 0.35); }

.card strong {
  display: block;
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 4px;
  color: var(--ink);
}

.card span {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(28, 36, 51, 0.04);
}

.panel-pad { padding: 18px 20px; }

.prose h2 { margin: 1.5rem 0 0.5rem; font-size: 1.15rem; font-weight: 800; }
.prose h3 { margin: 1.15rem 0 0.35rem; font-size: 1rem; font-weight: 800; }
.prose p, .prose li { color: var(--muted); line-height: 1.55; }
.prose p { margin: 0.5rem 0; }
.prose ul, .prose ol { margin: 0.4rem 0 0.8rem; padding-left: 1.2rem; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 0.6rem 0 1rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--blue-soft); color: var(--ink); }
.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86em;
  background: var(--blue-soft);
  padding: 1px 6px;
  border-radius: 6px;
}

.prose pre {
  overflow: auto;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 0.82rem;
  line-height: 1.45;
}

.prose pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer a { font-weight: 700; text-decoration: none; }

@media (max-width: 640px) {
  .top-links { gap: 8px; font-size: 0.78rem; }
}