:root {
  --about-bg: #f6f9fb;
  --about-panel: #ffffff;
  --about-text: #10222f;
  --about-muted: #59707f;
  --about-teal: #0ba99b;
  --about-gold: #a8842f;
  --about-line: rgba(16, 42, 58, .12);
  --about-font: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--about-text); background: var(--about-bg); font-family: var(--about-font); }
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; }
.about-shell { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }

.about-header { position: fixed; z-index: 20; top: 0; right: 0; left: 0; height: 80px; border-bottom: 1px solid rgba(16, 42, 58, .08); background: rgba(255, 255, 255, .85); backdrop-filter: blur(18px); }
.about-header__inner { height: 100%; display: flex; align-items: center; gap: 36px; }
.about-brand { flex: 0 0 auto; }
.about-brand img { width: 185px; }
.about-nav { display: flex; align-items: center; gap: 30px; margin-left: auto; }
.about-nav a { position: relative; padding: 29px 0 27px; color: var(--about-text); font-size: 14px; text-decoration: none; }
.about-nav a::after { content: ""; position: absolute; right: 0; bottom: 20px; left: 0; height: 2px; background: var(--about-teal); transform: scaleX(0); transition: transform .2s ease; }
.about-nav a:hover, .about-nav a:focus-visible, .about-nav a[aria-current="page"] { color: var(--about-text); }
.about-nav a:hover::after, .about-nav a:focus-visible::after, .about-nav a[aria-current="page"]::after { transform: scaleX(1); }
.about-contact-link { min-height: 42px; display: inline-flex; align-items: center; gap: 12px; padding: 0 18px; border: 1px solid rgba(16, 42, 58, .18); text-decoration: none; font-size: 14px; background: rgba(255, 255, 255, .6); }
.about-contact-link:hover, .about-contact-link:focus-visible { color: #fff; background: var(--about-teal); }

.about-hero { position: relative; min-height: 640px; height: calc(100svh - 120px); margin-top: 80px; overflow: hidden; display: grid; align-items: center; }
.about-hero__image, .about-hero__shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.about-hero__image { object-fit: cover; object-position: center; }
.about-hero__shade { background: linear-gradient(90deg, rgba(246, 250, 252, .90) 0%, rgba(246, 250, 252, .68) 35%, rgba(246, 250, 252, .08) 72%, rgba(246, 250, 252, .14) 100%), linear-gradient(transparent 68%, #f6f9fb); }
.about-hero__content { position: relative; z-index: 1; padding-top: 0; transform: translateY(-32px); }
.about-eyebrow { margin: 0; color: var(--about-teal); font: 700 11px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .14em; }
.about-hero h1 { max-width: 950px; margin: 22px 0 0; font-size: clamp(46px, 5vw, 72px); font-weight: 560; line-height: 1.08; letter-spacing: 0; }
.about-hero__lead { max-width: 720px; margin: 28px 0 0; color: rgba(16, 34, 47, .78); font-size: clamp(21px, 2.2vw, 30px); line-height: 1.55; }
.about-hero__actions { display: flex; gap: 14px; margin-top: 36px; }
.about-hero__actions a { min-height: 48px; display: inline-flex; align-items: center; justify-content: space-between; gap: 26px; padding: 0 20px; border: 1px solid rgba(16, 42, 58, .18); text-decoration: none; font-size: 14px; background: rgba(255, 255, 255, .6); }
.about-hero__actions a:first-child { color: #fff; border-color: var(--about-teal); background: var(--about-teal); }
.about-hero__actions a:hover, .about-hero__actions a:focus-visible { border-color: var(--about-gold); }
.about-hero__bottom { position: absolute; z-index: 2; right: 0; bottom: 34px; left: 0; display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; padding-top: 22px; border-top: 1px solid var(--about-line); }
.about-proof { display: grid; grid-template-columns: repeat(4, auto); margin: 0; }
.about-proof div { padding: 0 26px 0 0; }
.about-hero__contact { display: flex; align-items: center; gap: 22px; }
.about-hero__contact p { margin: 0; font-size: 13px; font-weight: 550; line-height: 1.8; white-space: nowrap; }
.about-hero__contact span { margin-right: 10px; color: var(--about-muted); font-size: 11px; font-weight: 400; letter-spacing: .1em; }
.about-hero__contact a { text-decoration: none; }
.about-hero__contact img { width: 60px; height: 60px; padding: 3px; object-fit: contain; background: #fff; border: 1px solid var(--about-line); border-radius: 6px; }
.about-proof div + div { padding-left: 26px; border-left: 1px solid var(--about-line); }
.about-proof dt { font-size: 20px; font-weight: 650; }
.about-proof dd { margin: 7px 0 0; color: var(--about-muted); font-size: 12px; }

.about-profile { padding: 82px 0; background: #f2f6f7; color: #071722; }
.about-profile__grid { display: grid; grid-template-columns: minmax(320px, .85fr) minmax(0, 1.15fr); gap: 88px; align-items: start; }
.about-section-title h2, .about-focus h2, .about-certs h2 { margin: 18px 0 0; font-size: clamp(38px, 5vw, 64px); font-weight: 440; line-height: 1.12; letter-spacing: 0; }
.about-profile .about-section-title h2 { margin-top: 18px; font-size: 32px; font-weight: 600; line-height: 1.5; }
.about-profile .about-section-title h2 span { display: block; }
.about-focus h2, .about-certs h2 { font-size: 32px; font-weight: 400; line-height: 1.4; }
.about-profile__copy { padding-top: 30px; border-top: 1px solid rgba(7, 23, 34, .18); }
.about-profile__copy p { margin: 0; color: #435462; font-size: 17px; line-height: 2; }
.about-profile__copy p + p { margin-top: 24px; }
.about-values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 48px; border: 1px solid rgba(7, 23, 34, .14); background: rgba(7, 23, 34, .14); }
.about-values article { min-height: 230px; padding: 34px; background: #fff; }
.about-values span { color: #108f88; font: 700 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.about-values h3 { margin: 36px 0 12px; font-size: 22px; }
.about-values p { margin: 0; color: #61717d; font-size: 14px; line-height: 1.8; }

.about-focus { padding: 120px 0; }
.about-focus__head, .about-certs__head { display: flex; align-items: end; justify-content: space-between; gap: 60px; }
.about-focus__head > p, .about-certs__head > p { max-width: 450px; margin: 0 0 6px; color: var(--about-muted); font-size: 15px; line-height: 1.8; }
.about-focus__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 56px; }
.about-focus__grid a { position: relative; aspect-ratio: 4 / 5; overflow: hidden; border: 1px solid var(--about-line); border-radius: 8px; text-decoration: none; }
.about-focus__grid img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.about-focus__grid a::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(246, 250, 252, .96), transparent 64%); }
.about-focus__grid span { position: absolute; z-index: 1; right: 26px; bottom: 26px; left: 26px; }
.about-focus__grid small, .about-focus__grid b, .about-focus__grid em { display: block; }
.about-focus__grid small { color: var(--about-teal); font: 700 10px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .1em; }
.about-focus__grid b { margin-top: 10px; font-size: 30px; }
.about-focus__grid em { margin-top: 9px; color: rgba(16, 34, 47, .68); font-size: 13px; font-style: normal; }
.about-focus__grid a:hover img, .about-focus__grid a:focus-visible img { transform: scale(1.035); }

.about-certs { padding: 120px 0; color: #071722; background: #eef3f4; }
.about-certs .about-eyebrow { color: #108f88; }
.about-certs__head > p { color: #60717d; }
.about-certs__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 54px; }
.about-certs__grid button { min-width: 0; padding: 0; overflow: hidden; border: 1px solid rgba(7, 23, 34, .14); border-radius: 8px; color: #071722; text-align: left; background: #fff; cursor: zoom-in; }
.about-certs__grid button > img { width: 100%; aspect-ratio: 4 / 3; object-fit: contain; padding: 16px; background: #f9fbfb; transition: transform .35s ease; }
.about-certs__grid button:hover > img, .about-certs__grid button:focus-visible > img { transform: scale(1.025); }
.about-certs__grid span { display: block; padding: 20px; border-top: 1px solid rgba(7, 23, 34, .1); }
.about-certs__grid b, .about-certs__grid small { display: block; }
.about-certs__grid b { font-size: 15px; }
.about-certs__grid small { margin-top: 7px; color: #71808b; font: 600 9px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .08em; }

.about-footer { padding: 32px 0; border-top: 1px solid var(--about-line); }
.about-footer > div { display: flex; align-items: center; gap: 32px; }
.about-footer img { width: 156px; }
.about-footer p { margin: 0; color: var(--about-muted); font-size: 12px; }
.about-footer__info { display: grid; gap: 7px; }
.about-footer__info a { color: var(--about-teal); text-decoration: none; }
.about-footer__info span + span, .about-footer__info a + span { margin-left: 18px; }
.about-footer__top { margin-left: auto; color: var(--about-teal); font-size: 12px; text-decoration: none; white-space: nowrap; }

.about-cert-dialog { width: min(920px, calc(100% - 48px)); max-height: calc(100svh - 48px); padding: 0; border: 1px solid rgba(16, 42, 58, .12); border-radius: 8px; color: var(--about-text); background: #ffffff; }
.about-cert-dialog::backdrop { background: rgba(16, 34, 47, .45); backdrop-filter: blur(8px); }
.about-cert-dialog > button { position: absolute; z-index: 2; top: 12px; right: 12px; width: 40px; height: 40px; padding: 0; border: 1px solid rgba(16, 42, 58, .18); border-radius: 50%; color: #10222f; font-size: 24px; background: rgba(255, 255, 255, .85); cursor: pointer; }
.about-cert-dialog figure { margin: 0; padding: 24px; }
.about-cert-dialog figure img { width: 100%; max-height: calc(100svh - 130px); object-fit: contain; background: #fff; }
.about-cert-dialog figcaption { padding-top: 14px; text-align: center; font-size: 14px; }

.about-partnership { padding: 120px 0; color: #071722; background: linear-gradient(100deg, rgba(255, 255, 255, .97) 25%, rgba(255, 255, 255, .9) 55%, rgba(244, 248, 249, .72)), url("../images/about-partnership-lab-bg.jpg") right center / cover no-repeat; }
.about-partnership__head { display: flex; align-items: end; justify-content: space-between; gap: 60px; }
.about-partnership__head > p { max-width: 450px; margin: 0 0 6px; color: var(--about-muted); font-size: 15px; line-height: 1.8; }
.about-partnership h2 { font-size: 32px; font-weight: 400; line-height: 1.4; }
.about-partnership__grid { margin-top: 54px; }

@media (max-width: 980px) {
  .about-nav { gap: 18px; }
  .about-contact-link { display: none; }
  .about-hero { height: auto; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding: 56px 0 30px; }
  .about-hero__content { transform: none; }
  .about-hero__bottom { position: static; margin-top: 46px; display: grid; gap: 24px; }
  .about-profile__grid { grid-template-columns: 1fr; gap: 46px; }
  .about-certs__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .about-shell { width: min(100% - 32px, 1180px); }
  .about-header { height: 68px; }
  .about-header__inner { gap: 14px; }
  .about-brand img { width: 112px; }
  .about-nav { gap: 12px; }
  .about-nav a { font-size: 13px; padding: 25px 0 23px; white-space: nowrap; }
  .about-hero { margin-top: 68px; padding: 40px 0 24px; }
  .about-hero h1 { font-size: clamp(32px, 10.5vw, 44px); }
  .about-hero__lead { margin-top: 20px; font-size: 19px; }
  .about-hero__actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 28px; }
  .about-hero__actions a { gap: 10px; padding: 0 14px; }
  .about-hero__bottom { margin-top: 36px; gap: 18px; padding-top: 16px; }
  .about-proof { grid-template-columns: repeat(2, 1fr); }
  .about-proof div { padding: 16px 16px 0 0; }
  .about-proof div + div { padding-left: 16px; }
  .about-proof div:nth-child(3) { padding-left: 0; border-left: 0; }
  .about-hero__contact { align-items: flex-start; gap: 14px; }
  .about-hero__contact p { white-space: normal; font-size: 12.5px; }
  .about-hero__contact img { width: 52px; height: 52px; }
  .about-profile, .about-focus, .about-certs, .about-partnership { padding: 84px 0; }
  .about-profile { padding: 64px 0; }
  .about-profile .about-section-title h2 { font-size: 26px; }
  .about-profile__copy { padding-top: 20px; }
  .about-values, .about-focus__grid { grid-template-columns: 1fr; }
  .about-values article { min-height: 190px; }
  .about-focus__head, .about-certs__head, .about-partnership__head { display: grid; align-items: start; gap: 22px; }
  .about-focus__grid a { aspect-ratio: 16 / 10; }
  .about-certs__grid { grid-template-columns: 1fr; }
  .about-focus h2, .about-certs h2, .about-partnership h2 { font-size: 26px; }
  .about-footer > div { display: grid; gap: 14px; }
  .about-footer__top { margin-left: 0; }
}

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