:root {
  color-scheme: light dark;
  --blue: #2f6fed;
  --blue-strong: #1f55c7;
  --blue-soft: #eaf1ff;
  --ink: #172033;
  --muted: #647087;
  --paper: #fffdf8;
  --canvas: #f5f7fb;
  --card: #ffffff;
  --line: #dfe5ef;
  --focus: #be2f5b;
  --shadow: 0 18px 48px rgba(31, 58, 102, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue-strong); text-underline-offset: 3px; }
a:hover { color: var(--blue); }
a:focus-visible, summary:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
  border-radius: 6px;
}
.wrap { width: min(920px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -.4px;
  text-decoration: none;
}
.brand-mark {
  position: relative;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--blue);
  box-shadow: 0 7px 18px rgba(47, 111, 237, .25);
}
.brand-mark::before {
  content: "";
  position: absolute;
  inset: 7px 6px 9px;
  border-radius: 3px;
  background: var(--paper);
  box-shadow: 0 5px 0 -3px #aac3fb;
}
nav { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 11px;
  border-radius: 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}
nav a:hover, nav a[aria-current="page"] { background: var(--blue-soft); color: var(--blue-strong); }
main { padding: 56px 0 80px; }
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 8vw, 72px);
  border: 1px solid var(--line);
  border-radius: 30px;
  background: var(--paper);
  box-shadow: var(--shadow);
}
.hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: -100px;
  width: 270px;
  height: 270px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 111, 237, .18), rgba(47, 111, 237, 0) 68%);
  pointer-events: none;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--blue-strong);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1, h2, h3 { line-height: 1.25; text-wrap: balance; }
h1 { margin: 0 0 18px; font-size: clamp(36px, 8vw, 64px); letter-spacing: -.045em; }
h2 { margin: 42px 0 14px; font-size: clamp(24px, 4vw, 30px); letter-spacing: -.025em; }
h3 { margin: 0 0 8px; font-size: 18px; }
p, ul, ol { margin: 0 0 18px; }
.lead { max-width: 690px; color: var(--muted); font-size: clamp(18px, 2.5vw, 21px); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 20px;
  border: 1px solid var(--blue);
  border-radius: 13px;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transition: transform .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-2px); background: var(--blue-strong); color: #fff; }
.button.secondary { background: transparent; color: var(--blue-strong); }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 26px; }
.card {
  display: block;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); border-color: #b9caf0; }
.card p { margin: 0; color: var(--muted); }
.page-title { max-width: 760px; margin-bottom: 30px; }
.page-title h1 { font-size: clamp(34px, 6vw, 52px); }
.updated { color: var(--muted); font-size: 14px; }
.content section {
  padding: 4px 0;
  scroll-margin-top: 88px;
}
.content li { margin-bottom: 8px; }
.note {
  margin: 26px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--blue);
  border-radius: 0 14px 14px 0;
  background: var(--blue-soft);
}
.contact {
  margin-top: 38px;
  padding: 30px;
  border: 1px solid #cad8f7;
  border-radius: 22px;
  background: var(--blue-soft);
}
.contact h2 { margin-top: 0; }
details {
  margin: 12px 0;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--card);
}
summary { min-height: 56px; padding: 15px 0; font-weight: 700; cursor: pointer; }
details p, details ul { padding-bottom: 6px; }
table { width: 100%; border-collapse: collapse; margin: 20px 0 28px; }
th, td { padding: 13px 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--blue-soft); }
footer { padding: 28px 0 38px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.footer-row { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }

@media (max-width: 760px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  nav { width: 100%; }
  nav a { padding: 7px 9px; }
  main { padding-top: 34px; }
  .grid { grid-template-columns: 1fr; }
  .hero { border-radius: 22px; }
  table { display: block; overflow-x: auto; }
}
@media (max-width: 420px) {
  .wrap { width: min(100% - 28px, 920px); }
  .hero, .card, .contact { padding: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button, .card { transition: none; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --blue: #7ba7ff;
    --blue-strong: #a8c4ff;
    --blue-soft: #18284a;
    --ink: #f1f5ff;
    --muted: #aebbd0;
    --paper: #151a24;
    --canvas: #0f131b;
    --card: #171d28;
    --line: #30394a;
    --focus: #ff7aa3;
    --shadow: none;
  }
  .button { color: #0d1830; }
  .button:hover { color: #0d1830; }
}