:root {
  --ink: #17202a;
  --muted: #5b6670;
  --paper: #f7f8f6;
  --white: #ffffff;
  --line: #d9dfdf;
  --teal: #0f6f6d;
  --blue: #1b5f8f;
  --copper: #b66b36;
  --gold: #d4a74f;
  --shadow: 0 20px 60px rgba(23, 32, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.65;
}

img {
  display: block;
  max-width: 100%;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 56px);
  color: var(--white);
  background: rgba(12, 22, 32, 0.5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(14px);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.92);
  border-color: var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid currentColor;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
  line-height: 1.2;
}

.brand small {
  color: currentColor;
  font-size: 12px;
  opacity: 0.78;
}

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

.nav a {
  position: relative;
  padding: 8px 0;
}

.nav a::after {
  position: absolute;
  right: 0;
  bottom: 2px;
  left: 0;
  height: 2px;
  background: var(--gold);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.2s ease;
}

.nav a:hover::after,
.nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: inherit;
  background: transparent;
  border: 1px solid currentColor;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  display: grid;
  min-height: min(860px, calc(100vh - 36px));
  overflow: hidden;
  color: var(--white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(7, 19, 32, 0.88) 0%, rgba(7, 19, 32, 0.64) 38%, rgba(7, 19, 32, 0.18) 78%),
    url("./assets/hero-infrastructure.png") center / cover no-repeat;
  transform: scale(1.02);
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 36px));
  margin: auto;
  padding: 116px 0 56px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--copper);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #f0be64;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: clamp(56px, 8vw, 118px);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  max-width: 920px;
  margin-bottom: 0;
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  font-size: 20px;
  line-height: 1.35;
}

.hero-lead {
  max-width: 730px;
  margin-bottom: 32px;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(18px, 2.2vw, 24px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 52px;
}

.primary-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 6px;
  font-weight: 800;
}

.primary-link {
  color: #121a21;
  background: #f2bd5c;
}

.secondary-link {
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.hero-profile {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 620px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.hero-profile img {
  width: 74px;
  aspect-ratio: 1;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.72);
  border-radius: 50%;
}

.hero-profile strong,
.hero-profile span {
  display: block;
}

.hero-profile span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}

.signal-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.signal-item {
  min-height: 142px;
  padding: 28px clamp(18px, 3vw, 40px);
  border-right: 1px solid var(--line);
}

.signal-item:last-child {
  border-right: 0;
}

.signal-item strong {
  display: block;
  margin-bottom: 8px;
  color: var(--teal);
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
}

.signal-item span {
  color: var(--muted);
}

.section {
  padding: clamp(72px, 10vw, 132px) clamp(18px, 5vw, 72px);
}

.section-head {
  width: min(1180px, 100%);
  margin: 0 auto 42px;
}

.intro-grid,
.capability-layout,
.evidence-grid,
.timeline,
.quote-grid,
.article-list {
  width: min(1180px, 100%);
  margin: 0 auto;
}

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

.intro-grid article,
.capability-panel article {
  min-height: 240px;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.intro-grid span {
  display: block;
  margin-bottom: 28px;
  color: var(--copper);
  font-weight: 900;
}

.intro-grid p,
.capability-panel p,
.timeline p,
.contact-card p {
  color: var(--muted);
}

.split-section {
  color: var(--white);
  background: #17323a;
}

.split-section .section-head h2 {
  color: var(--white);
}

.capability-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.2fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: start;
}

.capability-copy {
  position: sticky;
  top: 98px;
}

.capability-copy > p {
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
}

.method-list {
  display: grid;
  gap: 14px;
}

.method-list div {
  padding: 18px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}

.method-list strong,
.method-list span {
  display: block;
}

.method-list strong {
  color: #f1be63;
}

.method-list span {
  color: rgba(255, 255, 255, 0.72);
}

.capability-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.capability-panel article {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.capability-panel p {
  color: rgba(255, 255, 255, 0.72);
}

.visual-band {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 0.92fr);
  align-items: stretch;
  background: var(--ink);
  color: var(--white);
}

.visual-band img {
  width: 100%;
  height: 100%;
  min-height: 460px;
  object-fit: cover;
}

.visual-band div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(42px, 6vw, 82px);
}

.visual-band p:last-child {
  max-width: 640px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 18px;
}

.influence-section {
  background: var(--white);
}

.influence-feature {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(24px, 5vw, 62px);
  align-items: center;
  width: min(1180px, 100%);
  margin: 0 auto 38px;
}

.influence-feature img {
  width: 100%;
  aspect-ratio: 1.2;
  object-fit: cover;
  object-position: center;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.influence-feature h3 {
  margin-bottom: 16px;
  font-size: clamp(25px, 3vw, 36px);
}

.influence-feature p {
  color: var(--muted);
  font-size: 18px;
}

.research-list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
}

.research-list div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.research-list dt {
  color: var(--teal);
  font-weight: 900;
}

.research-list dd {
  margin: 0;
  color: var(--muted);
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.activity-grid article {
  overflow: hidden;
  background: #f7f8f6;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.activity-grid img {
  width: 100%;
  aspect-ratio: 1.22;
  object-fit: cover;
  object-position: center;
}

.activity-grid div {
  padding: 20px;
}

.activity-grid span {
  display: block;
  margin-bottom: 8px;
  color: var(--copper);
  font-size: 13px;
  font-weight: 900;
}

.activity-grid h3 {
  margin-bottom: 10px;
  font-size: 18px;
}

.activity-grid p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

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

.evidence-grid figure {
  margin: 0;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.evidence-grid img {
  width: 100%;
  aspect-ratio: 1.35;
  object-fit: cover;
  object-position: center;
  border-bottom: 1px solid var(--line);
}

.evidence-grid figcaption {
  min-height: 150px;
  padding: 22px;
}

.evidence-grid strong,
.evidence-grid span {
  display: block;
}

.evidence-grid span {
  margin-top: 8px;
  color: var(--muted);
}

.resume-section {
  background: var(--white);
}

.timeline {
  border-top: 1px solid var(--line);
}

.timeline article {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.timeline time {
  color: var(--teal);
  font-weight: 900;
}

.timeline h3 {
  margin-bottom: 8px;
}

.thinking-section {
  background: #eef2ef;
}

.quote-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 34px;
}

.quote-grid blockquote {
  min-height: 190px;
  margin: 0;
  padding: 28px;
  background: var(--white);
  border-left: 5px solid var(--copper);
  border-radius: 8px;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.45;
}

.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.article-list a {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-height: 86px;
  padding: 18px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-list a:hover {
  border-color: var(--teal);
  transform: translateY(-2px);
}

.article-list span {
  color: var(--copper);
  font-size: 14px;
  font-weight: 900;
}

.article-list strong {
  min-width: 0;
}

.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 420px);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  padding: clamp(72px, 9vw, 116px) clamp(18px, 5vw, 72px);
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(15, 111, 109, 0.96), rgba(27, 95, 143, 0.92)),
    url("./assets/hero-infrastructure.png") center / cover no-repeat;
}

.contact-section > div {
  max-width: 760px;
}

.contact-section .eyebrow {
  color: #f2bd5c;
}

.contact-card {
  padding: 28px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
}

.contact-card a {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 24px;
  font-weight: 900;
}

.contact-card p {
  color: rgba(255, 255, 255, 0.76);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px clamp(18px, 5vw, 72px);
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.site-footer a {
  color: var(--teal);
  font-weight: 800;
}

@media (max-width: 960px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    top: 72px;
    right: 18px;
    left: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    color: var(--ink);
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 12px;
  }

  .signal-bar,
  .intro-grid,
  .capability-layout,
  .visual-band,
  .influence-feature,
  .evidence-grid,
  .quote-grid,
  .article-list,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .activity-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .signal-item {
    min-height: 112px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .capability-copy {
    position: static;
  }

  .visual-band img {
    min-height: 320px;
  }
}

@media (max-width: 680px) {
  .site-header {
    min-height: 64px;
    padding-inline: 16px;
  }

  .brand small {
    display: none;
  }

  .nav {
    top: 64px;
  }

  .hero {
    min-height: auto;
  }

  .hero-bg {
    background:
      linear-gradient(180deg, rgba(7, 19, 32, 0.92) 0%, rgba(7, 19, 32, 0.74) 58%, rgba(7, 19, 32, 0.46) 100%),
      url("./assets/hero-infrastructure.png") center / cover no-repeat;
  }

  .hero-inner {
    width: min(100% - 32px, 1180px);
    padding: 104px 0 42px;
  }

  h1 {
    font-size: clamp(48px, 15vw, 60px);
  }

  h2 {
    font-size: 30px;
  }

  .hero-actions {
    display: grid;
  }

  .hero-profile {
    align-items: flex-start;
  }

  .capability-panel,
  .timeline article,
  .article-list a,
  .research-list div,
  .activity-grid {
    grid-template-columns: 1fr;
  }

  .intro-grid article,
  .capability-panel article {
    min-height: auto;
  }

  .quote-grid blockquote {
    min-height: auto;
    font-size: 20px;
  }

  .contact-card a {
    font-size: 20px;
    word-break: break-all;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}