*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 128px; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font-cn); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: var(--text); text-decoration: none; }
a:hover { color: var(--accent); }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, p, figure, dl, dd, fieldset { margin: 0; }
fieldset { border: 0; padding: 0; min-width: 0; }
legend { padding: 0; }
[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.skip { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--accent); color: var(--accent-ink); padding: 8px 16px; border-radius: var(--radius-pill); }
.skip:focus { left: 8px; }

/* 布局 */
.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--gutter); }
.narrow { max-width: 960px; }
.measure { max-width: 640px; }
.center { text-align: center; }
.section { padding-block: var(--s-9); }
.section-tight { padding-bottom: var(--s-9); }
.band { border-top: 1px solid var(--line); padding-block: var(--s-9); }
.stack-xs > * + * { margin-top: var(--s-1); }
.stack-s > * + * { margin-top: var(--s-3); }
.stack-m > * + * { margin-top: var(--s-4); }
.stack-l > * + * { margin-top: var(--s-5); }
.stack-xl > * + * { margin-top: var(--s-7); }
.split { display: flex; flex-wrap: wrap; gap: var(--s-8); align-items: center; }
.split > * { flex: 1 1 400px; min-width: 0; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr)); gap: var(--s-5); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); gap: var(--s-5); }

/* 文字 */
.kicker { font-family: var(--font-latin); font-size: 13px; letter-spacing: .22em; color: var(--accent); }
.display { font-size: clamp(44px, 7vw, 96px); font-weight: 900; line-height: 1.05; letter-spacing: -.02em; }
.display-sm { font-size: clamp(36px, 5vw, 64px); font-weight: 900; line-height: 1.12; }
.h2 { font-size: clamp(30px, 4.2vw, 50px); font-weight: 900; line-height: 1.18; }
.h1-product { font-family: var(--font-latin); font-size: clamp(36px, 4.4vw, 56px); font-weight: 700; line-height: 1.1; }
.lead { font-size: 17px; line-height: 1.8; color: var(--muted); }
.muted { color: var(--muted); }
.note { font-size: 13px; color: var(--faint); }
.accent { color: var(--accent); }

.prose h1 { font-size: clamp(30px, 4vw, 44px); font-weight: 900; margin-bottom: var(--s-3); }
.prose h2 { font-size: 20px; margin-top: var(--s-7); margin-bottom: var(--s-2); }
.prose p { line-height: 1.8; }