:root {
  --page: #f5f5f7;
  --surface: #fff;
  --ink: #1d1d1f;
  --muted: #636366;
  --blue: #0071e3;
  --line: rgba(60, 60, 67, .14);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: radial-gradient(circle at 50% 0, #fff 0, transparent 32rem), var(--page); font: 16px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--blue); }
.support-header { position: sticky; top: 0; z-index: 2; border-bottom: 1px solid var(--line); background: rgba(251,251,253,.78); backdrop-filter: saturate(180%) blur(20px); }
.support-nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; width: min(100% - 40px, 1040px); min-height: 60px; margin: auto; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 750; text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 8px; box-shadow: 0 2px 8px rgba(18,43,80,.12); }
.back-link { font-size: 14px; font-weight: 650; text-decoration: none; }
.support-main { width: min(100% - 40px, 1040px); margin: auto; padding: 88px 0 100px; }
.kicker { margin: 0; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
h1 { max-width: 820px; margin: 14px 0 22px; font-size: clamp(44px, 7vw, 82px); line-height: .98; letter-spacing: -.065em; }
.dek { max-width: 690px; margin: 0; color: var(--muted); font-size: 20px; line-height: 1.5; }
.support-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(260px, .8fr); gap: 18px; margin-top: 52px; align-items: start; }
.support-card, .support-aside { border: 1px solid var(--line); border-radius: 24px; background: rgba(255,255,255,.86); box-shadow: 0 18px 42px rgba(18,43,80,.07); }
.support-card { padding: 30px; }
.support-card h2 { margin: 0 0 12px; font-size: clamp(26px, 3vw, 36px); line-height: 1.1; letter-spacing: -.045em; }
.support-card h3 { margin: 30px 0 8px; font-size: 20px; line-height: 1.2; letter-spacing: -.025em; }
.support-card p { margin: 0 0 14px; color: #3a3a3c; }
.support-card ul, .support-card ol { margin: 12px 0 0; padding-left: 22px; color: #3a3a3c; }
.support-card li + li { margin-top: 10px; }
.support-aside { padding: 24px; }
.support-aside h2 { margin: 0 0 16px; font-size: 20px; line-height: 1.2; }
.support-aside nav { display: grid; gap: 9px; }
.support-aside a { padding: 11px 13px; border-radius: 12px; background: #f2f2f7; color: #1d1d1f; font-size: 14px; font-weight: 650; text-decoration: none; }
.support-aside a:hover { background: #e8f1ff; color: var(--blue); }
.note { margin-top: 22px; padding: 14px 16px; border-left: 3px solid var(--blue); background: #eef4ff; color: #415473; font-size: 14px; }
.source-list { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.source-list a { text-underline-offset: 3px; }
.support-footer { width: min(100% - 40px, 1040px); margin: auto; padding: 0 0 42px; color: var(--muted); font-size: 13px; }
@media (max-width: 720px) {
  .support-nav, .support-main, .support-footer { width: min(100% - 32px, 1040px); }
  .support-main { padding: 62px 0 70px; }
  .support-grid { grid-template-columns: 1fr; margin-top: 34px; }
  .support-card { padding: 22px; border-radius: 20px; }
  .support-aside { padding: 20px; border-radius: 20px; }
  .dek { font-size: 18px; }
}