:root {
  color-scheme: light dark;
  --bg: #f7f7fb;
  --card: #ffffff;
  --fg: #16142b;
  --muted: #5b5875;
  --border: #e3e1ef;
  --primary: #5b3ce0;
  --primary-fg: #ffffff;
  --accent: #e5487f;
  --soft: #f0edff;
  --ok: #0f7b4a;
  --err: #b42335;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0e1a;
    --card: #171628;
    --fg: #ecebf7;
    --muted: #a6a3c2;
    --border: #2b2944;
    --primary: #9a86ff;
    --primary-fg: #120f24;
    --accent: #ff7aa8;
    --soft: #221f3d;
    --ok: #4ade9a;
    --err: #ff8a98;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}
a { color: var(--primary); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
header.site { border-bottom: 1px solid var(--border); background: var(--card); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 10px; }
.brand b { display: block; font-size: 16px; line-height: 1.1; letter-spacing: -0.01em; }
.brand small { display: block; font-size: 10px; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--primary); }
nav.top { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; }
nav.top a { text-decoration: none; color: var(--muted); }
nav.top a[aria-current="page"] { color: var(--fg); font-weight: 600; }
main { padding: 28px 0 40px; }
h1 { font-size: clamp(26px, 5vw, 34px); line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.02em; }
h2 { font-size: 21px; line-height: 1.3; margin: 34px 0 10px; padding-top: 6px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 22px 0 6px; }
p, ul, ol { margin: 0 0 12px; }
li { margin: 4px 0; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 18px; }
.lang-switch { display: inline-flex; gap: 8px; font-size: 14px; margin-bottom: 18px; flex-wrap: wrap; }
.lang-switch a { border: 1px solid var(--border); border-radius: 999px; padding: 3px 12px; text-decoration: none; background: var(--card); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin: 16px 0; }
.callout { background: var(--soft); border: 1px solid var(--border); border-left: 4px solid var(--primary); border-radius: 10px; padding: 14px 16px; margin: 14px 0; }
.toc { font-size: 15px; }
.toc ol { padding-left: 20px; margin: 6px 0 0; columns: 2 240px; column-gap: 28px; }
section.lang { scroll-margin-top: 12px; }
hr.split { border: 0; border-top: 2px dashed var(--border); margin: 44px 0 10px; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 8px 0 14px; display: block; overflow-x: auto; }
th, td { text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); padding: 8px 10px; }
th { font-weight: 600; background: var(--soft); }
code { font: 13.5px/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background: var(--soft); padding: 1px 5px; border-radius: 5px; word-break: break-all; }
form.req { display: grid; gap: 12px; }
.row { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
@media (max-width: 600px) { .row { grid-template-columns: 1fr; } }
label { display: grid; gap: 4px; font-size: 14px; font-weight: 600; }
input, select, textarea {
  font: inherit; font-weight: 400; color: var(--fg); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: 9px 12px; width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 1px; }
textarea { min-height: 110px; resize: vertical; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
button {
  font: inherit; font-weight: 600; border: 0; border-radius: 10px; padding: 10px 18px; cursor: pointer;
  background: var(--primary); color: var(--primary-fg); justify-self: start;
}
button[disabled] { opacity: 0.55; cursor: not-allowed; }
.hint { font-size: 13px; color: var(--muted); font-weight: 400; }
.status { font-size: 14px; min-height: 1.4em; }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }
footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }
footer.site .wrap { padding-top: 18px; padding-bottom: 26px; display: flex; gap: 8px 18px; flex-wrap: wrap; justify-content: space-between; }
footer.site a { color: var(--muted); }
@media print { header.site nav, form.req, .lang-switch { display: none; } body { background: #fff; color: #000; } }
.mt0 { margin-top: 0; }