.about { margin: 0 auto; max-width: 1240px; padding: 36px 28px 110px; }
.about section + section { margin-top: clamp(70px, 9vw, 116px); }
.about h2 { font-size: clamp(2rem, 4.4vw, 4rem); font-weight: 200; letter-spacing: -.045em; line-height: 1.02; margin: 10px 0 16px; }
.about h3 { font-size: 1rem; font-weight: 520; margin: 14px 0 8px; }
.about p { line-height: 1.72; }
.about-hero { align-items: center; display: grid; gap: clamp(34px, 6vw, 80px); grid-template-columns: minmax(0, .82fr) minmax(420px, 1.18fr); min-height: calc(100vh - 120px); }
.hero-copy h1 { font-size: clamp(3.5rem, 7.4vw, 7.2rem); font-weight: 180; letter-spacing: -.065em; line-height: .88; margin: 22px 0; }
.hero-copy > p { color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.17rem); margin: 0; max-width: 610px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hero-points { color: var(--muted); display: flex; flex-wrap: wrap; font-size: .72rem; gap: 16px 26px; list-style: none; margin: 24px 0 0; padding: 0; }
.hero-points li::before { color: var(--jade); content: "●"; margin-right: 8px; }
.hero-visual { margin: 0; position: relative; }
.hero-visual img { aspect-ratio: 1.13; border: 1px solid var(--hair); border-radius: var(--radius-lg); box-shadow: var(--card-shadow); display: block; object-fit: cover; width: 100%; }
:root[data-theme="neo"] .hero-visual img, :root[data-theme="neo"] .visual-explainer > img { filter: brightness(.72) contrast(1.06); }
.hero-visual figcaption { backdrop-filter: blur(14px); background: var(--glass-2); border: 1px solid var(--hair); bottom: 14px; color: var(--muted); font-size: .75rem; left: 14px; line-height: 1.5; max-width: 330px; padding: 12px 14px; position: absolute; }
.about-index { background: var(--glass-2); border: 1px solid var(--hair); border-radius: var(--radius-lg); display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; margin: 0 auto; padding: 7px; position: sticky; top: 77px; width: fit-content; z-index: 5; }
.about-index a { border-radius: var(--radius); color: var(--muted); font-size: .75rem; padding: 9px 13px; }
.about-index a:hover, .about-index a:focus-visible { background: var(--input); color: var(--text); outline: none; }
.about-intro { border-bottom: 1px solid var(--hair); border-top: 1px solid var(--hair); display: grid; gap: clamp(28px, 7vw, 100px); grid-template-columns: 1fr 1fr; padding: clamp(34px, 6vw, 70px) 0; }
.about-intro > div:first-child, .section-heading { background: var(--glass-2); border: 1px solid var(--hair); border-radius: var(--radius-lg); box-shadow: var(--card-shadow); box-sizing: border-box; padding: clamp(24px, 4vw, 42px); }
.intro-copy { color: var(--muted); font-size: 1rem; }
.intro-copy p:first-child { color: var(--text); font-size: 1.12rem; margin-top: 0; }
.section-heading { margin-bottom: 34px; max-width: 820px; }
.section-heading > p { color: var(--muted); margin: 0; max-width: 680px; }
.about-grid, .feature-grid { display: grid; gap: 12px; }
.about-grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.about-grid article, .feature-grid article { background: var(--glass-2); border: 1px solid var(--hair); border-radius: var(--radius-lg); box-shadow: var(--card-shadow); padding: 24px; }
.about-grid article > span { color: var(--jade); font-size: .66rem; font-weight: 650; letter-spacing: .16em; }
.about-grid article p, .feature-grid article p { color: var(--muted); font-size: .86rem; margin: 0; }
.visual-explainer { align-items: center; display: grid; gap: clamp(34px, 7vw, 90px); grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr); }
.visual-explainer > img { aspect-ratio: 16 / 10; border: 1px solid var(--hair); border-radius: var(--radius-lg); box-shadow: var(--card-shadow); object-fit: cover; width: 100%; }
.definition-list { display: grid; margin: 24px 0 0; }
.definition-list div { border-top: 1px solid var(--hair); display: grid; gap: 12px; grid-template-columns: 90px 1fr; padding: 15px 0; }
.definition-list dt { font-weight: 550; }
.definition-list dd { color: var(--muted); font-size: .88rem; line-height: 1.55; margin: 0; }
.feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.about-split { align-items: center; background: var(--glass-2); border: 1px solid var(--hair); border-radius: var(--radius-lg); box-shadow: var(--card-shadow); display: grid; gap: clamp(28px, 6vw, 80px); grid-template-columns: 1fr 1fr; padding: clamp(26px, 5vw, 54px); }
.about-split > div:first-child > p { color: var(--muted); margin-bottom: 0; }
.access-list { display: grid; gap: 8px; }
.access-list p { background: var(--input); border: 1px solid var(--hair); border-radius: var(--radius); display: grid; gap: 5px; margin: 0; padding: 16px; }
.access-list strong { font-size: .83rem; }
.access-list span { color: var(--muted); font-size: .8rem; line-height: 1.5; }
.builder-flow { align-items: stretch; display: grid; gap: 10px; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; }
.builder-flow div { background: var(--glass-2); border: 1px solid var(--hair); border-radius: var(--radius-lg); display: grid; gap: 8px; min-height: 150px; padding: 22px; }
.builder-flow b { color: var(--jade); font-size: .7rem; }
.builder-flow span { color: var(--muted); font-size: .8rem; line-height: 1.45; }
.builder-flow i { align-self: center; color: var(--muted); font-style: normal; }
.faq-grid { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.faq-grid details { background: var(--glass-2); border: 1px solid var(--hair); border-radius: var(--radius-lg); padding: 18px 20px; }
.faq-grid summary { cursor: pointer; font-size: .9rem; font-weight: 520; }
.faq-grid p { color: var(--muted); font-size: .84rem; margin: 14px 0 0; }
.about-cta { align-items: center; background: var(--primary); border-radius: var(--radius-lg); color: var(--primary-ink); display: flex; gap: 30px; justify-content: space-between; padding: clamp(28px, 5vw, 58px); }
.about-cta h2 { max-width: 700px; }
.about-cta p { color: color-mix(in srgb, var(--primary-ink) 68%, transparent); margin: 0; max-width: 650px; }
.about-cta .tag { border-color: color-mix(in srgb, var(--primary-ink) 22%, transparent); color: color-mix(in srgb, var(--primary-ink) 64%, transparent); }
.about-cta .btn { background: var(--primary-ink); color: var(--primary); flex: none; }
@media (max-width: 900px) {
  .about { padding-inline: 18px; }
  .about-hero, .about-intro, .visual-explainer, .about-split { grid-template-columns: 1fr; }
  .about-hero { min-height: auto; padding-top: 42px; }
  .about-grid.four, .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .builder-flow { grid-template-columns: 1fr 1fr; }
  .builder-flow i { display: none; }
  .about-index { overflow-x: auto; top: 68px; width: 100%; }
}
@media (max-width: 560px) {
  .about-grid.four, .feature-grid, .faq-grid, .builder-flow { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: clamp(3.2rem, 17vw, 5rem); }
  .hero-visual figcaption { position: static; }
  .about-index { justify-content: flex-start; }
  .about-cta { align-items: stretch; flex-direction: column; }
  .about-cta .btn { justify-content: center; }
  .about-intro > div:first-child, .section-heading { border-radius: 18px; padding: 22px 18px; }
}