:root {
  --about-ink: #101a2c;
  --about-navy: #071323;
  --about-blue: #2866d7;
  --about-orange: #f1a53a;
  --about-green: #16856f;
  --about-line: #d8e0ea;
  --about-soft: #f3f6f9;
  --about-white: #ffffff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--about-ink);
  background: var(--about-white);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}
a { color: inherit; }
img { max-width: 100%; }
.about-wrap { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.review-ribbon {
  min-height: 34px;
  display: grid;
  place-items: center;
  padding: 7px 16px;
  color: #352300;
  background: #ffc65f;
  font-size: 12px;
  font-weight: 800;
  text-align: center;
}
.about-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 76px;
  background: rgba(255, 255, 255, .98);
  border-bottom: 1px solid #e6ebf1;
}
.about-nav {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 28px;
}
.about-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  text-decoration: none;
  font-size: 24px;
  font-weight: 900;
  white-space: nowrap;
}
.about-brand img { width: 52px; height: 38px; object-fit: contain; }
.desktop-nav { display: flex; align-items: center; gap: 24px; }
.desktop-nav a,
.lang-switch {
  position: relative;
  padding: 26px 0 22px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 750;
  white-space: nowrap;
}
.desktop-nav a.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 15px;
  height: 3px;
  background: var(--about-orange);
}
.desktop-nav .nav-cta {
  padding: 12px 17px;
  color: #172033;
  background: var(--about-orange);
  border-radius: 6px;
}
.lang-switch {
  padding: 10px 14px;
  border: 1px solid #aeb9c8;
  border-radius: 6px;
}
.mobile-menu { display: none; }

.about-hero {
  min-height: 720px;
  display: flex;
  align-items: center;
  color: #f8fbff;
  background-color: var(--about-navy);
  background-image:
    linear-gradient(90deg, rgba(4, 11, 21, .99) 0%, rgba(4, 11, 21, .96) 34%, rgba(4, 11, 21, .64) 49%, rgba(4, 11, 21, .08) 72%),
    url("/assets/v46/media/technology-engineering-front-v22-content-v2-desktop-ced1fbb0.webp");
  background-position: center, center;
  background-repeat: no-repeat;
  background-size: cover, cover;
}
.hero-copy { width: min(680px, 54%); padding: 78px 0 68px; }
.eyebrow {
  display: block;
  margin-bottom: 18px;
  color: var(--about-orange);
  font-size: 13px;
  font-weight: 900;
  line-height: 1.4;
}
.about-hero h1 {
  max-width: 660px;
  margin: 0;
  font-size: clamp(48px, 4.7vw, 68px);
  line-height: 1.04;
  letter-spacing: 0;
}
.about-hero h1 span { display: block; }
.hero-lead {
  max-width: 610px;
  margin: 26px 0 0;
  color: #cfdae8;
  font-size: 18px;
  line-height: 1.75;
}
.hero-chips { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 24px; }
.hero-chips span {
  padding: 8px 11px;
  color: #e8eef7;
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .25);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 750;
}
.hero-actions,
.direction-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 20px;
  color: #fff;
  background: var(--about-blue);
  border: 1px solid var(--about-blue);
  border-radius: 6px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 850;
}
.button.secondary { color: #fff; background: transparent; border-color: #a8b5c5; }

.about-section { padding: 104px 0; }
.about-section.soft { background: var(--about-soft); }
.about-section.dark { color: #f5f8fc; background: #0b1728; }
.about-section:not(.dark):not(.direction-section) .eyebrow { color: #944600; }
.section-heading { max-width: 850px; margin-bottom: 48px; }
.section-heading h2,
.purpose-grid h2,
.evidence-heading h2,
.direction-copy h2 {
  margin: 0;
  font-size: clamp(38px, 4.2vw, 60px);
  line-height: 1.08;
  letter-spacing: 0;
}
.section-heading p,
.direction-copy p {
  max-width: 720px;
  margin: 18px 0 0;
  color: #5a687a;
  font-size: 17px;
  line-height: 1.75;
}
.dark .section-heading p { color: #c2cedd; }
.purpose-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 80px;
  align-items: start;
}
.purpose-copy p { margin: 0 0 18px; color: #526173; font-size: 17px; line-height: 1.8; }
.purpose-statement {
  margin-top: 32px;
  padding: 22px 0 22px 26px;
  color: #183b79;
  border-left: 5px solid var(--about-blue);
  font-size: 23px;
  font-weight: 900;
  line-height: 1.35;
}
.principle-grid,
.method-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid #b9c4d1;
}
.principle,
.method-step { min-width: 0; padding: 28px 24px 26px 0; border-bottom: 1px solid #b9c4d1; }
.principle + .principle,
.method-step + .method-step { padding-left: 24px; border-left: 1px solid #b9c4d1; }
.principle .no,
.method-step .no { display: block; margin-bottom: 40px; color: var(--about-blue); font-weight: 900; }
.principle h3,
.method-step h3 { margin: 0; font-size: 22px; line-height: 1.25; }
.principle p,
.method-step p { margin: 12px 0 0; color: #566578; font-size: 15px; line-height: 1.7; }
.dark .method-grid { border-color: #3a495d; }
.dark .method-step { border-color: #3a495d; }
.dark .method-step + .method-step { border-color: #3a495d; }
.dark .method-step .no { color: #73a2ff; }
.dark .method-step p { color: #b9c6d6; }

.evidence-heading { max-width: 900px; margin-bottom: 44px; }
.evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.evidence-panel {
  padding: 30px;
  background: #fff;
  border: 1px solid var(--about-line);
  border-radius: 8px;
}
.evidence-panel.verified { border-top: 5px solid var(--about-green); }
.evidence-panel.review { border-top: 5px solid var(--about-orange); }
.evidence-panel h3 { margin: 0 0 20px; font-size: 22px; }
.evidence-panel ul { margin: 0; padding: 0; list-style: none; }
.evidence-panel li { position: relative; padding: 13px 0 13px 24px; border-top: 1px solid #e4e9ef; line-height: 1.6; }
.evidence-panel li::before { content: ""; position: absolute; left: 0; top: 21px; width: 8px; height: 8px; background: var(--about-green); }
.evidence-panel.review li::before { background: var(--about-orange); }
.evidence-note { margin: 20px 0 0; color: #5d6978; font-size: 14px; line-height: 1.65; }

.direction-section { color: #fff; background: #15345f; }
.direction-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, .8fr); gap: 76px; align-items: center; }
.direction-copy p { color: #d1def0; }
.direction-rail { border-top: 1px solid rgba(255,255,255,.4); }
.direction-rail span {
  display: flex;
  align-items: center;
  min-height: 58px;
  border-bottom: 1px solid rgba(255,255,255,.4);
  font-size: 16px;
  font-weight: 800;
}
.direction-rail span::before { content: ""; width: 10px; height: 10px; margin-right: 14px; background: var(--about-orange); }
.direction-section .button.secondary { color: #fff; }

.contact-section { background: #fff; }
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  gap: 76px;
  align-items: start;
}
.contact-heading h2 { margin: 0; font-size: clamp(38px, 4.2vw, 60px); line-height: 1.08; }
.contact-heading p { max-width: 520px; margin: 18px 0 0; color: #5a687a; font-size: 17px; line-height: 1.75; }
.contact-details { margin: 0; border-top: 1px solid #aebbc9; font-style: normal; }
.contact-details > div {
  display: grid;
  grid-template-columns: minmax(110px, .3fr) minmax(0, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid #d8e0ea;
}
.contact-details span { color: #68778a; font-size: 14px; font-weight: 800; }
.contact-details strong,
.contact-details a { color: #15243a; font-size: 18px; font-weight: 800; line-height: 1.55; text-decoration: none; }
.contact-details a:hover { color: var(--about-blue); text-decoration: underline; }
.contact-email-row > div { min-width: 0; }
.contact-email-row small { display: block; max-width: 590px; margin-top: 10px; color: #68778a; font-size: 12px; line-height: 1.65; }

.about-footer { padding: 58px 0 28px; color: #c5d0de; background: #07101d; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 44px; }
.footer-brand { color: #fff; font-size: 25px; font-weight: 900; }
.footer-summary { max-width: 440px; margin: 14px 0 0; line-height: 1.7; }
.footer-col h3 { margin: 0 0 14px; color: #fff; font-size: 14px; }
.footer-col a { display: block; margin: 10px 0; color: #c5d0de; text-decoration: none; }
.about-policy-links { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 34px; padding-top: 22px; border-top: 1px solid #263345; }
.about-policy-links a { color: #d6e0ec; font-size: 13px; text-decoration: none; }
.footer-bottom { margin-top: 38px; padding-top: 22px; border-top: 1px solid #263345; font-size: 13px; }

@media (max-width: 1080px) {
  .desktop-nav { gap: 16px; }
  .desktop-nav a { font-size: 14px; }
  .about-nav { gap: 18px; }
}

@media (max-width: 820px) {
  .about-wrap { width: min(100% - 32px, 620px); }
  .review-ribbon { font-size: 11px; }
  .about-header { height: 66px; position: relative; }
  .about-brand { font-size: 20px; }
  .about-brand img { width: 43px; height: 32px; }
  .desktop-nav { display: none; }
  .lang-switch { margin-left: auto; font-size: 13px; }
  .mobile-menu { display: block; position: relative; }
  .mobile-menu summary {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid #b9c3d0;
    border-radius: 6px;
    cursor: pointer;
    list-style: none;
    font-size: 0;
  }
  .mobile-menu summary::-webkit-details-marker { display: none; }
  .mobile-menu summary::before { content: "☰"; font-size: 22px; line-height: 1; }
  .mobile-menu[open] nav {
    position: absolute;
    top: 50px;
    right: 0;
    width: min(290px, calc(100vw - 32px));
    display: grid;
    padding: 10px;
    background: #fff;
    border: 1px solid var(--about-line);
    box-shadow: 0 18px 40px rgba(0,0,0,.18);
  }
  .mobile-menu nav a { padding: 13px 12px; text-decoration: none; border-bottom: 1px solid #edf0f4; font-weight: 750; }
  .about-hero {
    min-height: 0;
    display: block;
    background: var(--about-navy);
  }
  .about-hero::after {
    content: "";
    display: block;
    width: 100%;
    aspect-ratio: 43 / 38;
    background-color: var(--about-navy);
    background-image: image-set(
      url("/assets/v28-about-hero-mobile.avif") type("image/avif"),
      url("/assets/v46/media/v28-about-hero-mobile-3ecf51f5.webp") type("image/webp")
    );
    background-position: center;
    background-repeat: no-repeat;
    background-size: contain;
  }
  .hero-copy { width: 100%; padding: 58px 0 44px; }
  .about-hero h1 { max-width: none; font-size: clamp(38px, 10vw, 52px); line-height: 1.06; }
  html[lang="en"] .about-hero h1 { font-size: clamp(35px, 9.2vw, 47px); }
  .contact-grid { grid-template-columns: 1fr; gap: 34px; }
  .contact-heading h2 { font-size: clamp(34px, 9vw, 46px); }
  .contact-details > div { grid-template-columns: 1fr; gap: 8px; padding: 20px 0; }
  .contact-details strong,
  .contact-details a { font-size: 16px; overflow-wrap: anywhere; }
  .hero-lead { font-size: 16px; line-height: 1.7; }
  .hero-chips { display: grid; grid-template-columns: 1fr; }
  .hero-chips span { width: max-content; max-width: 100%; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .button { width: 100%; padding-left: 12px; padding-right: 12px; }
  .about-section { padding: 72px 0; }
  .purpose-grid,
  .direction-grid { grid-template-columns: 1fr; gap: 38px; }
  .section-heading h2,
  .purpose-grid h2,
  .evidence-heading h2,
  .direction-copy h2 { font-size: clamp(34px, 9vw, 46px); }
  .purpose-statement { font-size: 20px; }
  .principle-grid,
  .method-grid { grid-template-columns: 1fr; }
  .principle,
  .method-step,
  .principle + .principle,
  .method-step + .method-step { padding: 24px 0; border-left: 0; }
  .principle .no,
  .method-step .no { margin-bottom: 16px; }
  .evidence-grid { grid-template-columns: 1fr; }
  .evidence-panel { padding: 24px 20px; }
  .direction-grid { gap: 42px; }
  .direction-actions { display: grid; grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-intro { grid-column: 1 / -1; }
}

@media (max-width: 420px) {
  .about-wrap { width: calc(100% - 28px); }
  .about-brand span { font-size: 18px; }
  .lang-switch { padding: 9px 10px; }
  .hero-actions { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-intro { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}