:root {
  color-scheme: light;
  --ink: #142b45;
  --muted: #61748a;
  --accent: #205fe4;
  --border: #dce5ee;
  --surface: #ffffff;
  --background: #f4f7fb;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--background);
  line-height: 1.75;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.navigation {
  max-width: 1100px;
  margin: auto;
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { color: var(--ink); font-weight: 800; letter-spacing: .04em; }
nav { display: flex; flex-wrap: wrap; gap: 22px; }
nav a { color: var(--muted); font-size: 14px; }
nav a[aria-current="page"] { color: var(--accent); font-weight: 700; }
main { max-width: 1100px; margin: auto; padding: 64px 28px; }
.eyebrow { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .17em; }
h1 { margin: 14px 0 20px; font-size: clamp(32px, 5vw, 54px); letter-spacing: -.04em; line-height: 1.25; }
h2 { margin: 0 0 12px; font-size: 22px; }
h3 { margin: 0 0 10px; font-size: 18px; }
p { margin: 0 0 16px; }
.lead { max-width: 690px; color: var(--muted); font-size: 17px; }
.hero { padding-bottom: 38px; }
.badge { display: inline-block; padding: 5px 12px; background: #e9f0ff; color: var(--accent); border-radius: 20px; font-size: 12px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 28px; }
.card p { color: var(--muted); font-size: 14px; }
.card-number { display: block; margin-bottom: 22px; font-size: 12px; font-weight: 700; color: var(--accent); letter-spacing: .1em; }
.card a { display: inline-block; margin-top: 12px; font-weight: 700; font-size: 14px; }
.note { margin-top: 28px; padding: 18px 22px; border-left: 3px solid var(--accent); background: #eaf0f9; color: var(--muted); font-size: 14px; }
.stack { display: grid; gap: 22px; }
.stack .card { padding: 30px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tags span { padding: 3px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 12px; color: var(--muted); }
.button, button {
  display: inline-block;
  border: 0;
  border-radius: 8px;
  padding: 11px 19px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.button:hover { color: #fff; text-decoration: none; background: #164bc0; }
button:disabled { opacity: .6; cursor: wait; }
pre { overflow: auto; padding: 22px; background: #142b45; color: #d4e8ff; border-radius: 10px; font-size: 13px; line-height: 1.6; }
code { font-family: "Cascadia Code", Consolas, monospace; overflow-wrap: anywhere; }
.status { font-size: 14px; color: var(--muted); }
.status[data-state="success"] { color: #147d54; }
.status[data-state="error"] { color: #b33030; }
footer { max-width: 1100px; margin: auto; padding: 22px 28px 38px; color: var(--muted); font-size: 12px; border-top: 1px solid var(--border); }
@media (max-width: 720px) {
  .navigation { align-items: flex-start; flex-direction: column; gap: 12px; }
  nav { gap: 18px; }
  main { padding-top: 40px; }
  .grid { grid-template-columns: 1fr; }
}