:root {
  color-scheme: dark;
  --qs-bg: #101415;
  --qs-surface: #191c1e;
  --qs-surface-high: #272a2c;
  --qs-surface-highest: #323537;
  --qs-primary: #b3c5ff;
  --qs-primary-strong: #0066ff;
  --qs-text: #e0e3e5;
  --qs-text-secondary: #c2c6d8;
  --qs-outline: #424656;
  --qs-max: 920px;
}
* { box-sizing: border-box; }
html { background: var(--qs-bg); }
body { margin: 0; background: var(--qs-bg); color: var(--qs-text); font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.75; }
a { color: var(--qs-primary); text-underline-offset: 3px; }
a:hover { color: #d7deff; }
.site-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid rgba(66, 70, 86, .55); background: rgba(16, 20, 21, .94); backdrop-filter: blur(12px); }
.header-inner { max-width: var(--qs-max); margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; gap: 18px; }
.brand { color: var(--qs-primary); font-size: 24px; font-weight: 800; letter-spacing: -.6px; text-decoration: none; }
.header-spacer { flex: 1; }
.lang-link, .back-link { font-size: 14px; color: var(--qs-text-secondary); text-decoration: none; }
.lang-link:hover, .back-link:hover { color: var(--qs-primary); }
main { max-width: var(--qs-max); margin: 0 auto; padding: 48px 24px 64px; }
.hero { margin-bottom: 30px; }
.eyebrow { margin: 0 0 8px; color: var(--qs-primary); font-size: 12px; font-weight: 700; letter-spacing: 1.4px; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(30px, 6vw, 46px); line-height: 1.2; letter-spacing: -1px; }
.meta { margin: 12px 0 0; color: var(--qs-text-secondary); font-size: 14px; }
.notice { margin: 24px 0 30px; padding: 16px 18px; background: rgba(0, 102, 255, .12); border: 1px solid rgba(179, 197, 255, .28); border-radius: 14px; color: var(--qs-text); }
.legal-card { padding: 30px; background: var(--qs-surface); border: 1px solid rgba(255, 255, 255, .08); border-radius: 18px; box-shadow: 0 18px 48px rgba(0, 0, 0, .18); }
section + section { margin-top: 34px; }
h2 { margin: 0 0 12px; color: var(--qs-text); font-size: 20px; line-height: 1.4; }
p { margin: 0 0 14px; }
ul, ol { margin: 10px 0 14px; padding-left: 1.5rem; }
li + li { margin-top: 7px; }
code { padding: 2px 6px; border-radius: 6px; background: var(--qs-surface-high); color: var(--qs-primary); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
.site-footer { border-top: 1px solid rgba(66, 70, 86, .45); background: var(--qs-bg); }
.app-footer-wrap { max-width: var(--qs-max); margin: 0 auto; padding: 22px 24px 28px; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px 18px; }
.app-footer-link, .app-footer-company { color: var(--qs-text-secondary); text-decoration: none; }
.app-footer-link { font-size: 13px; font-weight: 500; }
.app-footer-link:hover, .app-footer-company:hover { color: var(--qs-primary); }
.app-footer-company { display: inline-flex; flex-direction: column; align-items: flex-start; gap: 2px; }
.app-footer-company-text { font-size: 12px; line-height: 1.35; }

@media (max-width: 640px) {
  .header-inner { padding: 14px 18px; gap: 12px; }
  .brand { font-size: 22px; }
  .back-link { display: none; }
  main { padding: 34px 16px 48px; }
  .legal-card { padding: 22px 18px; border-radius: 15px; }
  .app-footer-wrap { padding: 20px 18px 24px; gap: 8px 14px; }
  .app-footer-company { width: 100%; align-items: center; margin-top: 2px; }
}