:root {
  color-scheme: light dark;
  --ink: #1b2233;
  --mute: #5d6678;
  --bg: #f4f6fa;
  --card: #ffffff;
  --line: #e2e6ee;
  --acc: #4c63a0;
  --acc-ink: #ffffff;
  --acc-soft: #e9eef9;
  --ok: #2f7d55;
  --ok-soft: #e5f3ec;
  --shadow: 0 1px 2px rgba(20, 30, 60, .05), 0 8px 24px rgba(20, 30, 60, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8ebf2;
    --mute: #a2aabb;
    --bg: #17191d;
    --card: #212429;
    --line: #33373f;
    --acc: #93a7dc;
    --acc-ink: #10131a;
    --acc-soft: #262d3d;
    --ok: #79c79c;
    --ok-soft: #1f2e27;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--acc); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--acc); outline-offset: 2px; border-radius: 6px; }
.wrap { max-width: 780px; margin: 0 auto; padding: 0 16px; }

/* Header */
.top { border-bottom: 1px solid var(--line); background: var(--card); }
.top .wrap { display: flex; align-items: center; gap: 12px; min-height: 64px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 17px; color: var(--ink); text-decoration: none; margin-right: auto; }
.brand svg { width: 34px; height: 34px; flex: none; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.nav a { color: var(--mute); text-decoration: none; font-size: 15px; padding: 6px 10px; border-radius: 8px; }
.nav a:hover { color: var(--ink); background: var(--acc-soft); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav .lang { border: 1px solid var(--line); margin-left: 4px; }

/* Page */
main { padding: 44px 0 72px; }
.eyebrow { color: var(--acc); font-weight: 600; font-size: 14px; letter-spacing: .02em; margin: 0 0 6px; }
h1 { font-size: clamp(28px, 6vw, 38px); line-height: 1.15; letter-spacing: -.01em; margin: 0 0 10px; }
.lead { font-size: 18px; color: var(--mute); margin: 0 0 28px; max-width: 620px; }
h2 { font-size: 21px; line-height: 1.3; margin: 44px 0 10px; scroll-margin-top: 16px; }
h3 { font-size: 16px; margin: 22px 0 4px; }
p { margin: 0 0 12px; }
ul, ol { margin: 0 0 12px; padding-left: 22px; }
li { margin: 4px 0; }
.meta { color: var(--mute); font-size: 14px; }
kbd { font: 600 13px/1 ui-monospace, SFMono-Regular, Menlo, monospace; padding: 2px 6px; border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; background: var(--card); white-space: nowrap; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px; margin: 16px 0; box-shadow: var(--shadow); }
.card > :last-child { margin-bottom: 0; }
.card.accent { border-color: transparent; background: linear-gradient(135deg, #8299cc, #4c63a0); color: #fff; }
.card.accent p, .card.accent h2 { color: #fff; }
.card.accent .meta { color: rgba(255, 255, 255, .85); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin: 16px 0; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); }
.tile strong { display: block; font-size: 15px; margin-bottom: 2px; }
.tile span { color: var(--mute); font-size: 14px; line-height: 1.5; display: block; }
.tile .tick { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--ok-soft); color: var(--ok); margin-bottom: 8px; }
.tick svg { width: 14px; height: 14px; }

.btn { display: inline-flex; align-items: center; gap: 8px; background: var(--acc); color: var(--acc-ink); text-decoration: none; font-weight: 600; padding: 11px 18px; border-radius: 10px; }
.btn:hover { filter: brightness(1.06); }
.card.accent .btn { background: #fff; color: #33467a; }
.mail { font-weight: 600; }

.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; position: relative; padding-left: 40px; margin: 12px 0; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 1px; width: 26px; height: 26px; border-radius: 50%; background: var(--acc-soft); color: var(--acc); font-weight: 700; font-size: 14px; display: grid; place-items: center; }

/* FAQ */
.faq { border: 1px solid var(--line); border-radius: 16px; background: var(--card); box-shadow: var(--shadow); overflow: hidden; margin: 12px 0; }
.faq details { border-top: 1px solid var(--line); }
.faq details:first-child { border-top: 0; }
.faq summary { cursor: pointer; list-style: none; padding: 16px 48px 16px 20px; font-weight: 600; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 22px; top: 50%; width: 8px; height: 8px; border-right: 2px solid var(--mute); border-bottom: 2px solid var(--mute); transform: translateY(-70%) rotate(45deg); transition: transform .15s; }
.faq details[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq summary:hover { background: var(--acc-soft); }
.faq .a { padding: 0 20px 16px; }
.faq .a > :last-child { margin-bottom: 0; }

.toc { columns: 2 220px; column-gap: 24px; list-style: none; padding: 0; margin: 0; }
.toc li { margin: 0 0 6px; break-inside: avoid; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--mute); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 6px 16px; }
footer a { color: var(--mute); }

@media (max-width: 560px) {
  main { padding-top: 32px; }
  .card { padding: 20px; }
  .lead { font-size: 17px; }
  .top .wrap { padding-top: 10px; padding-bottom: 8px; gap: 6px; }
  .nav { width: 100%; justify-content: space-between; gap: 0; }
  .nav a { font-size: 14px; padding: 6px 7px; }
  .nav .lang { margin-left: 0; }
}