/* About 页面沿用全局品牌色与系统排版。 */
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:32px}
body{margin:0;min-width:320px;background:var(--brand-background);color:var(--text-primary)}
a{color:var(--brand-primary);text-decoration:none;text-underline-offset:4px}
a:focus-visible{outline:2px solid var(--brand-focus-border);outline-offset:5px;border-radius:3px}
.skip-link{position:absolute;top:12px;left:12px;transform:translateY(-160%);padding:8px 16px;background:var(--brand-surface);z-index:2}
.skip-link:focus{transform:none}
.site-header,main,.site-footer{width:min(1120px,100% - 64px);margin-inline:auto}
.site-header{min-height:100px;display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--divider)}
.wordmark{display:flex;align-items:center;gap:10px;color:var(--brand-deep);font-size:20px;font-weight:600;line-height:1.25}
.wordmark img{object-fit:contain;flex:none}
.wordmark small{display:block;margin-top:3px;color:var(--brand-primary);font-size:10px;letter-spacing:.16em;font-weight:500}
.site-header nav{display:flex;gap:28px;margin-left:auto;font-size:var(--type-ui)}
.site-header nav a{color:var(--text-secondary)}
.header-cta{display:flex;gap:14px;align-items:center;font-size:var(--type-ui);font-weight:600}
.hero{display:grid;grid-template-columns:1.35fr 1fr;gap:64px;align-items:center;padding:90px 0 96px}
.eyebrow{margin:0 0 24px;color:var(--brand-primary);font-size:var(--type-meta);letter-spacing:.1em;font-weight:500}
h1,h2,h3{color:var(--brand-deep)}
.hero h1{margin:0;font-size:clamp(40px,4.8vw,64px);line-height:1.25;letter-spacing:-.03em;font-weight:600}
.hero-description{max-width:440px;margin:28px 0 0;font-size:18px;line-height:1.9;color:var(--text-secondary)}
.hero-actions{display:flex;gap:28px;align-items:center;flex-wrap:wrap;margin-top:32px}
.cta{display:inline-flex;gap:24px;align-items:center;padding:12px 20px;border-radius:8px;background:var(--brand-primary);color:var(--brand-surface);font-size:var(--type-ui);font-weight:500}
.cta:hover{background:var(--brand-primary-hover);}
.text-link{display:inline-flex;align-items:center;gap:12px;font-size:var(--type-ui)}
.hero-note{margin-top:20px;font-size:var(--type-meta);color:var(--text-secondary)}
.hero-brand{min-height:360px;display:flex;flex-direction:column;align-items:center;justify-content:center;border-left:1px solid var(--divider);text-align:center}
.hero-brand img{object-fit:contain}
.brand-name{margin-top:22px;font-size:32px;letter-spacing:.12em;font-weight:800;color:var(--brand-deep)}
.brand-english{margin-top:4px;font-size:14px;letter-spacing:.4em;color:var(--brand-primary);padding-left:.4em}
.hero-brand p{margin:20px 0 0;font-size:var(--type-label);color:var(--text-secondary)}
.section{padding:64px 0;border-top:1px solid var(--divider)}
.section-heading{max-width:640px;margin-bottom:36px}
.section-heading .eyebrow{margin-bottom:14px}
h2{font-size:clamp(24px,2.6vw,32px);line-height:1.4;margin:0;font-weight:600}
.section-heading>p:not(.eyebrow){color:var(--text-secondary);margin:14px 0 0;line-height:1.8}
.capabilities{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));column-gap:40px}
.capabilities article{padding:28px 0;border-top:1px solid var(--divider)}
.feature-index{color:var(--brand-primary);font-size:var(--type-meta);font-variant-numeric:tabular-nums}
h3{margin:12px 0;font-size:18px;font-weight:600;line-height:1.5}
.capabilities p,.steps p,.data-grid p,.brand-story p{font-size:var(--type-ui);line-height:1.9;color:var(--text-secondary);margin:0 0 12px;text-wrap:pretty}
.feature-detail{font-size:var(--type-meta);color:var(--brand-primary)}
.section-note{margin:20px 0 0;color:var(--text-secondary);font-size:var(--type-label);line-height:1.8}
.start-section{display:grid;grid-template-columns:1fr 1.2fr;gap:80px}
.start-section .text-link{margin-top:24px}
.steps{list-style:none;margin:0;padding:0}
.steps li{display:flex;gap:20px;padding:0 0 24px;margin-bottom:24px;border-bottom:1px solid var(--divider)}
.steps li:last-child{margin:0;padding:0;border:0}
.step-number{flex:none;width:32px;height:32px;display:grid;place-items:center;border-radius:50%;background:var(--surface-muted);color:var(--brand-primary);font-size:var(--type-ui);font-weight:600}
.steps h3{margin:0 0 8px}
.steps p{margin:0}
.data-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.data-grid h3{margin-top:0}
.brand-story{display:grid;grid-template-columns:1fr 1.2fr;gap:80px;padding:48px 0 64px;border-top:1px solid var(--divider)}
.brand-story .eyebrow{margin-bottom:14px}
.brand-story strong{color:var(--brand-deep)}
.site-footer{display:flex;align-items:center;gap:24px;padding:28px 0 36px;border-top:1px solid var(--divider)}
.site-footer .wordmark{font-size:16px}
.site-footer p{margin:0;color:var(--text-secondary);font-size:var(--type-meta)}
.site-footer>.text-link{margin-left:auto}
@media(max-width:850px){
  .site-header,main,.site-footer{width:calc(100% - 40px)}
  .site-header{gap:20px}.site-header nav{gap:18px}
  .hero{gap:32px;padding:64px 0}.hero-brand img{width:160px;height:154px}
  .hero-description{font-size:16px}.hero-note{max-width:300px;line-height:1.8}
  .capabilities{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px}
  .start-section,.brand-story{gap:40px}.data-grid{grid-template-columns:1fr;gap:20px}
}
@media(max-width:560px){
  .site-header{min-height:84px;gap:16px;flex-wrap:wrap;padding:20px 0 16px}
  .site-header nav{order:3;width:100%;justify-content:space-between;margin:0;gap:12px;font-size:var(--type-label)}
  .header-cta{margin-left:auto}.hero{grid-template-columns:1fr;gap:36px;padding:48px 0}
  .hero-brand{min-height:0;flex-direction:row;flex-wrap:wrap;justify-content:flex-start;gap:10px;border-left:0;border-top:1px solid var(--divider);padding-top:24px;text-align:left}
  .hero-brand img{width:56px;height:54px}.brand-name{margin:0;font-size:22px}.brand-english{margin:0;font-size:11px;letter-spacing:.2em;padding:0}
  .hero-brand p{width:100%;margin:4px 0 0}.hero-actions{gap:20px}.hero h1{font-size:42px}
  .section{padding:40px 0}.section-heading{margin-bottom:24px}
  .capabilities{grid-template-columns:1fr}.capabilities article{padding:24px 0}
  .start-section,.brand-story{grid-template-columns:1fr;gap:28px}
  .brand-story{padding:40px 0}.site-footer{flex-wrap:wrap;gap:16px}.site-footer p{width:100%;order:3}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media(forced-colors:active){a:focus-visible{outline-color:Highlight}.cta{border:1px solid ButtonText}.step-number{border:1px solid CanvasText}}