:root { color-scheme: light; --ink: hsl(225 30% 11%); --muted: hsl(225 10% 31%); --line: hsl(36 12% 87%); --paper: hsl(40 33% 99.3%); --accent: #8a6d1f; --focus: hsl(216 60% 40%); }
    * { box-sizing: border-box; }
    html { scroll-padding-top: 24px; }
    body { margin: 0; background: var(--paper); color: var(--ink); font-family: "Geist", "Noto Sans SC", "Microsoft YaHei UI", system-ui, sans-serif; line-height: 1.8; }
    a { color: inherit; text-underline-offset: 5px; }
    a:focus-visible, summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 6px; }
    .wrap { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
    .skip { position: absolute; top: -100px; left: 16px; padding: 8px 16px; background: white; z-index: 2; }
    .skip:focus { top: 12px; }
    header { display: flex; justify-content: space-between; align-items: center; gap: 24px; min-height: 96px; border-bottom: 1px solid var(--line); }
    .wordmark { font-size: 29px; font-weight: 700; letter-spacing: -.8px; text-decoration: none; }
    .wordmark span { color: var(--accent); }
    nav { display: flex; flex-wrap: wrap; gap: 12px 28px; font-size: 14px; }
    nav a { text-decoration: none; padding-block: 10px; }
    nav a:hover { text-decoration: underline; }
    .hero { padding: 88px 0 80px; max-width: 820px; }
    .eyebrow { font-size: 13px; letter-spacing: .15em; color: var(--muted); margin: 0 0 24px; }
    h1 { font-size: clamp(34px, 5.2vw, 60px); line-height: 1.28; letter-spacing: -.035em; font-weight: 600; margin: 0 0 28px; text-wrap: balance; }
    .lead { font-size: 19px; line-height: 1.9; max-width: 680px; color: var(--muted); margin: 0; }
    .chapter { border-top: 1px solid var(--line); padding: 44px 0 48px; display: grid; grid-template-columns: 1fr 2fr; gap: 56px; }
    .number { color: var(--accent); font-size: 12px; letter-spacing: .12em; font-variant-numeric: tabular-nums; }
    h2 { font-size: 25px; line-height: 1.4; margin: 10px 0 0; font-weight: 600; }
    h3 { font-size: 17px; margin: 0 0 6px; font-weight: 600; }
    p { margin: 0 0 18px; }
    .body-copy { color: var(--muted); }
    .body-copy strong { color: var(--ink); font-weight: 600; }
    .audiences { list-style: none; padding: 0; margin: 20px 0 0; }
    .audiences li { padding: 16px 0; border-top: 1px solid var(--line); }
    .audiences li:last-child { padding-bottom: 0; }
    .audiences p { margin: 0; }
    ol { margin: 0; padding-left: 22px; }
    ol li { padding-left: 8px; margin-bottom: 20px; }
    ol li:last-child { margin-bottom: 0; }
    details { border-bottom: 1px solid var(--line); padding: 18px 0; }
    details:first-child { padding-top: 0; }
    summary { font-weight: 600; cursor: pointer; color: var(--ink); }
    details p { margin: 14px 0 0; }
    footer { border-top: 1px solid var(--line); padding: 28px 0 36px; font-size: 13px; color: var(--muted); display: flex; justify-content: space-between; gap: 24px; }
    footer p { margin: 0; }
    @media (max-width: 640px) {
      .wrap { width: calc(100% - 40px); }
      header { min-height: 82px; gap: 16px; }
      .wordmark { font-size: 25px; }
      nav { gap: 8px 16px; font-size: 13px; }
      nav a:last-child { display: inline; }
      .hero { padding: 56px 0; }
      .lead { font-size: 17px; }
      .chapter { grid-template-columns: 1fr; gap: 24px; padding: 32px 0 36px; }
      h2 { font-size: 23px; }
      footer { flex-direction: column; gap: 12px; }
    }
    @media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; } }

/* Public brand application only. Values follow DESIGN.md; no shared token changes. */
.wordmark { display: inline-flex; flex-shrink: 0; align-items: center; min-height: 48px; }
.wordmark img { width: 192px; height: 48px; display: block; }
.hero { max-width: none; display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 64px; align-items: center; }
.hero-copy { min-width: 0; }
h1 { font-size: clamp(34px, 4vw, 52px); }
.brand-promise { color: var(--ink); margin: 28px 0 0; padding-left: 16px; border-left: 2px solid var(--accent); font-size: 16px; font-weight: 500; }
.brand-signature { display: flex; flex-direction: column; align-items: center; padding: 32px 16px; border-block: 1px solid var(--line); }
.brand-signature img { display: block; width: 160px; height: 160px; }
.brand-signature > span:first-of-type { font-size: 24px; font-weight: 600; }
.brand-signature small { font-size: 12px; color: var(--muted); letter-spacing: .08em; }
.signature-rule { width: 32px; border-top: 1px solid var(--accent); margin: 24px 0; }
.brand-principle { display: flex; gap: 40px; align-items: baseline; padding: 20px 0; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
.brand-principle span { white-space: nowrap; color: var(--ink); }
.brand-principle p { margin: 0; }
.error-page { padding-block: 64px; }
.error-page h1 { margin-top: 48px; }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; gap: 24px; } .brand-signature { display: none; } }
@media (max-width: 640px) { header { flex-wrap: wrap; padding-block: 16px; gap: 8px; } .wordmark img { width: 176px; height: 44px; } nav { width: 100%; justify-content: space-between; gap: 8px; } .brand-principle { flex-direction: column; gap: 8px; } }

@media (max-width: 640px) { .brand-principle span { white-space: normal; } }