:root {
  --blue: #27aae1;
  --blue-dark: #0879aa;
  --orange: #f7941d;
  --ink: #172033;
  --muted: #536579;
  --line: #d9e7ef;
  --soft: #f3f8fb;
  --navy: #0b223a;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #f3f6f8;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.68;
}
a { color: var(--blue-dark); text-underline-offset: 3px; }
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .95);
  box-shadow: 0 10px 30px rgba(15, 23, 42, .06);
  backdrop-filter: blur(14px);
}
.top-inner {
  width: min(1120px, calc(100% - 36px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); font-size: 1.08rem; font-weight: 900; text-decoration: none; }
.brand img { width: auto; height: 45px; object-fit: contain; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; }
.nav a { color: #36516a; font-size: .9rem; font-weight: 760; text-decoration: none; }
.nav a:hover { color: var(--blue-dark); }
.lang { padding: 7px 10px; border: 1px solid var(--line); border-radius: 9px; background: white; }
.wrap { width: min(960px, calc(100% - 36px)); margin: 0 auto; padding: 46px 0 72px; }
.hero {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: radial-gradient(circle at 90% 0, rgba(39, 170, 225, .18), transparent 40%), linear-gradient(135deg, #fff, #f8fcfe);
  box-shadow: 0 18px 45px rgba(15, 23, 42, .08);
}
.pill { display: inline-flex; padding: 5px 10px; border-radius: 999px; color: #066b94; background: #e9f8fd; font-size: .75rem; font-weight: 900; letter-spacing: .09em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.18; letter-spacing: -.025em; }
h1 { margin: 14px 0 8px; color: var(--navy); font-size: clamp(2.25rem, 6vw, 3.5rem); }
h2 { margin: 0 0 10px; color: var(--navy); font-size: 1.35rem; }
h3 { margin: 18px 0 6px; font-size: 1rem; }
.lead { max-width: 780px; margin: 0; color: var(--muted); font-size: 1.05rem; }
.notice { margin-top: 18px; padding: 15px 17px; border-left: 4px solid var(--orange); border-radius: 8px; color: #70420c; background: #fff8ed; }
.toc { margin: 22px 0; padding: 20px 24px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.toc strong { display: block; margin-bottom: 8px; }
.toc ol { margin: 0; padding-left: 22px; columns: 2; column-gap: 36px; }
.toc li { break-inside: avoid; margin: 4px 0; }
.toc a { color: #36516a; }
.stack { display: grid; gap: 16px; margin-top: 20px; }
.card { padding: 25px 27px; border: 1px solid var(--line); border-radius: 14px; background: white; box-shadow: 0 10px 28px rgba(15, 23, 42, .045); }
.card p:first-of-type { margin-top: 0; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.card ul { padding-left: 22px; }
.card li + li { margin-top: 7px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 20px; }
.meta { margin-top: 22px; color: #68778a; font-size: .88rem; }
.footer { padding: 30px 18px 46px; color: #a8b4c2; background: #0b1521; font-size: .88rem; }
.footer-inner { width: min(960px, 100%); margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px 24px; }
.footer a { color: #d6e3ed; }
@media (max-width: 720px) {
  .top { position: static; }
  .top-inner { padding: 13px 0; align-items: flex-start; flex-direction: column; gap: 10px; }
  .nav { gap: 7px 13px; }
  .hero { padding: 24px; }
  .toc ol { columns: 1; }
  .grid { grid-template-columns: 1fr; }
  .card { padding: 21px; }
}