:root {
  --text: #12161b;
  --muted: #68717a;
  --line: rgba(18, 22, 27, 0.12);
  --surface: #f4f7f8;
  --white: #ffffff;
  --green: #0f7b54;
  --deep-green: #0a3f2d;
  --gold: #c69a4a;
  --ink: #080d11;
  --sage: #dfe9de;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--white);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.about-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  padding: 0 40px;
  color: var(--white);
  background: rgba(8, 13, 17, 0.16);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.about-header.is-scrolled {
  color: var(--text);
  background: rgba(255, 255, 255, 0.94);
  border-color: var(--line);
}

.about-brand {
  display: inline-flex;
  align-items: center;
  min-width: 166px;
  height: 40px;
}

.about-logo {
  display: block;
  width: 146px;
  height: auto;
}

.about-logo-dark {
  display: none;
}

.about-header.is-scrolled .about-logo-dark {
  display: block;
}

.about-header.is-scrolled .about-logo-light {
  display: none;
}

.about-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
}

.about-nav a {
  opacity: 0.9;
}

.about-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: end;
  padding: 120px 8vw 96px;
  color: var(--white);
  background: var(--ink);
  overflow: hidden;
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(5, 11, 9, 0.86), rgba(5, 11, 9, 0.45) 52%, rgba(5, 11, 9, 0.14)),
    linear-gradient(180deg, rgba(5, 11, 9, 0.08), rgba(5, 11, 9, 0.78));
}

.about-hero-media {
  position: absolute;
  inset: 0;
  background: url("assets/brochure/page-47-image-0.jpg") center/cover;
  transform: scale(1.02);
}

.about-hero-content {
  position: relative;
  z-index: 2;
  width: min(920px, 100%);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.about-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(42px, 7vw, 86px);
  line-height: 1.04;
}

.about-hero p {
  max-width: 760px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.75;
}

.hero-index {
  position: absolute;
  right: 8vw;
  bottom: 96px;
  z-index: 2;
  display: grid;
  gap: 10px;
}

.hero-index span {
  min-width: 140px;
  padding: 12px 18px;
  color: rgba(255, 255, 255, 0.86);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(16px);
  font-weight: 800;
  text-align: center;
}

.about-tabs {
  position: sticky;
  top: 64px;
  z-index: 12;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  padding: 0 8vw;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.about-tabs a {
  display: grid;
  place-items: center;
  min-height: 58px;
  color: rgba(18, 22, 27, 0.64);
  font-size: 14px;
  font-weight: 800;
  background: rgba(18, 22, 27, 0.035);
  border-right: 1px solid rgba(18, 22, 27, 0.06);
}

.about-tabs a:last-child {
  border-right: 0;
}

.section {
  padding: 112px 8vw;
}

.section-heading {
  max-width: 960px;
  margin-bottom: 48px;
}

.section-heading h2,
.intro-lead h2,
.strategy-copy h2,
.empower-head h2,
.responsibility-grid h2,
.closing h2 {
  margin: 0;
  font-size: clamp(32px, 4.8vw, 62px);
  line-height: 1.12;
}

.section-heading p,
.intro-lead p,
.strategy-copy p,
.empower-head p,
.responsibility-grid p {
  max-width: 850px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.intro-section {
  background: #ffffff;
}

.intro-lead {
  display: grid;
  grid-template-columns: minmax(320px, 0.55fr) minmax(0, 1fr);
  gap: 58px;
  align-items: start;
  margin-bottom: 54px;
}

.intro-lead p {
  margin-top: 6px;
}

.intro-grid,
.authority-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.intro-grid article,
.authority-grid article {
  min-height: 270px;
  padding: 32px;
  background: #ffffff;
  border: 1px solid var(--line);
}

.intro-grid article {
  background: #f8faf8;
}

.intro-grid span,
.authority-grid span {
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.intro-grid h3,
.authority-grid h3,
.empower-flow h3 {
  margin: 18px 0 12px;
  font-size: 24px;
  line-height: 1.3;
}

.intro-grid p,
.authority-grid p,
.empower-flow p {
  margin: 0;
  color: var(--muted);
  line-height: 1.82;
}

.strategy-section {
  display: grid;
  grid-template-columns: minmax(340px, 0.72fr) minmax(0, 1.28fr);
  gap: 48px;
  align-items: center;
  min-height: 820px;
  padding: 112px 8vw;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.98), rgba(255, 255, 255, 0.92)),
    url("assets/brochure/page-03-image-3.jpg") center/cover;
}

.strategy-map {
  position: relative;
  min-height: 560px;
}

.strategy-map::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 34%;
  width: 190px;
  height: 2px;
  background: var(--green);
}

.strategy-map::after {
  content: "";
  position: absolute;
  top: 20%;
  left: calc(34% + 188px);
  width: 2px;
  height: 60%;
  background: repeating-linear-gradient(to bottom, var(--green) 0 10px, transparent 10px 17px);
  opacity: 0.7;
}

.strategy-core {
  position: absolute;
  top: calc(50% - 54px);
  left: 0;
  display: grid;
  place-items: center;
  width: 220px;
  height: 108px;
  color: var(--white);
  background: var(--green);
  font-size: 24px;
  font-weight: 900;
  line-height: 1.25;
  text-align: center;
}

.strategy-node {
  position: absolute;
  left: calc(34% + 245px);
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 22px;
  align-items: center;
  width: min(520px, calc(100% - 34% - 245px));
}

.strategy-node::before {
  content: "";
  display: grid;
  place-items: center;
  width: 112px;
  height: 112px;
  color: var(--white);
  background: var(--deep-green);
  border: 10px solid var(--sage);
  border-radius: 999px;
}

.strategy-node strong {
  position: absolute;
  left: 0;
  width: 112px;
  color: var(--white);
  font-size: 20px;
  text-align: center;
}

.strategy-node span {
  color: #39423d;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.72;
}

.node-industry {
  top: 8%;
}

.node-education {
  top: calc(50% - 56px);
}

.node-research {
  bottom: 8%;
}

.authority-section {
  background: #ffffff;
}

.empower-section {
  display: grid;
  grid-template-columns: minmax(300px, 0.64fr) minmax(0, 1.36fr);
  gap: 64px;
  align-items: start;
  padding: 112px 8vw;
  background: #f5f7f4;
}

.empower-head {
  position: sticky;
  top: 136px;
}

.empower-flow {
  position: relative;
  display: grid;
  gap: 28px;
  padding-left: 54px;
}

.empower-flow::before {
  content: "";
  position: absolute;
  top: 24px;
  bottom: 24px;
  left: 15px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--green) 0 10px, transparent 10px 17px);
}

.empower-flow article {
  position: relative;
  padding: 30px 34px;
  background: #ffffff;
  border: 1px solid rgba(18, 22, 27, 0.08);
}

.empower-flow article::before {
  content: "";
  position: absolute;
  top: 34px;
  left: -48px;
  width: 18px;
  height: 18px;
  background: var(--green);
  border: 6px solid #dce8db;
  border-radius: 999px;
}

.empower-flow span {
  color: var(--green);
  font-size: 15px;
  font-weight: 900;
}

.responsibility-section {
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(6, 13, 17, 0.9), rgba(6, 13, 17, 0.72)),
    url("assets/brochure/page-29-image-0.jpg") center/cover;
}

.responsibility-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.85fr) minmax(0, 1.15fr);
  gap: 56px;
  align-items: center;
}

.responsibility-grid p {
  color: rgba(255, 255, 255, 0.74);
}

.responsibility-list {
  display: grid;
  gap: 1px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.responsibility-list article {
  padding: 28px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
}

.responsibility-list strong {
  display: block;
  margin-bottom: 10px;
  font-size: 23px;
}

.responsibility-list span {
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
}

.closing {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: center;
  padding: 70px 8vw;
  color: var(--white);
  background: #0b1014;
}

.closing p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 146px;
  height: 48px;
  padding: 0 18px;
  color: var(--white);
  background: var(--green);
  border-radius: 4px;
  font-weight: 800;
}

@media (max-width: 1180px) {
  .intro-grid,
  .authority-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .strategy-section,
  .empower-section,
  .responsibility-grid {
    grid-template-columns: 1fr;
  }

  .strategy-map {
    min-height: 640px;
  }

  .empower-head {
    position: static;
  }
}

@media (max-width: 980px) {
  .about-header {
    padding: 0 22px;
  }

  .about-tabs {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-index {
    display: none;
  }

  .intro-lead,
  .closing {
    grid-template-columns: 1fr;
  }

  .strategy-map::before,
  .strategy-map::after {
    display: none;
  }

  .strategy-map {
    display: grid;
    gap: 16px;
    min-height: auto;
  }

  .strategy-core,
  .strategy-node {
    position: static;
    width: 100%;
  }

  .strategy-core {
    height: auto;
    padding: 28px;
  }

  .strategy-node {
    grid-template-columns: 96px 1fr;
    padding: 22px;
    background: #ffffff;
    border: 1px solid var(--line);
  }

  .strategy-node::before {
    display: none;
  }

  .strategy-node strong {
    position: static;
    width: 96px;
    height: 96px;
    display: grid;
    place-items: center;
    color: var(--white);
    background: var(--deep-green);
    border: 10px solid var(--sage);
    border-radius: 999px;
    text-align: center;
  }
}

@media (max-width: 680px) {
  .about-logo {
    width: 122px;
  }

  .about-brand {
    min-width: 138px;
  }

  .about-nav {
    gap: 14px;
    font-size: 13px;
  }

  .about-nav a:nth-child(2) {
    display: none;
  }

  .about-hero,
  .section,
  .strategy-section,
  .empower-section,
  .closing {
    padding-left: 22px;
    padding-right: 22px;
  }

  .about-tabs {
    padding-left: 22px;
    padding-right: 22px;
    grid-template-columns: 1fr;
  }

  .about-tabs a {
    min-height: 46px;
    border-right: 0;
    border-bottom: 1px solid rgba(18, 22, 27, 0.06);
  }

  .intro-grid,
  .authority-grid {
    grid-template-columns: 1fr;
  }

  .intro-grid article,
  .authority-grid article {
    min-height: auto;
    padding: 26px;
  }

  .strategy-node {
    grid-template-columns: 1fr;
  }

  .strategy-node strong {
    position: static;
    display: grid;
    place-items: center;
    height: 96px;
  }

  .empower-flow {
    padding-left: 0;
  }

  .empower-flow::before,
  .empower-flow article::before {
    display: none;
  }
}