:root {
  --bg: #f5f7f4;
  --surface: #ffffff;
  --surface-soft: #eef3ef;
  --ink: #13201c;
  --muted: #60716b;
  --line: #d8e1dc;
  --accent: #0f8f6f;
  --accent-dark: #0a614f;
  --accent-soft: #dff3ea;
  --navy: #142b35;
  --gold: #b88a38;
  --shadow: 0 18px 50px rgba(19, 32, 28, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 4vw, 64px);
  border-bottom: 1px solid rgba(216, 225, 220, 0.8);
  background: rgba(245, 247, 244, 0.92);
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 260px;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: #fff;
  background: var(--navy);
  border: 1px solid rgba(255, 255, 255, 0.12);
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.25;
}

.brand strong {
  font-size: 15px;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.site-nav a {
  padding: 8px 0;
}

.site-nav a:hover {
  color: var(--accent-dark);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.nav-toggle span {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hero {
  padding: clamp(72px, 9vw, 130px) clamp(18px, 4vw, 64px) 52px;
  background:
    linear-gradient(110deg, rgba(20, 43, 53, 0.96), rgba(16, 77, 66, 0.95)),
    var(--navy);
  color: #fff;
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(38px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 760px;
  margin: 26px 0 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: clamp(17px, 2vw, 22px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
}

.button.primary {
  color: #fff;
  background: var(--accent);
}

.button.primary:hover {
  background: var(--accent-dark);
}

.button.ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.06);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 980px;
  margin: 64px 0 0;
  padding: 0;
  background: rgba(255, 255, 255, 0.16);
}

.hero-metrics div {
  padding: 24px;
  background: rgba(10, 25, 28, 0.3);
}

.hero-metrics dt {
  color: #fff;
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 800;
  line-height: 1;
}

.hero-metrics dd {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.72);
}

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(68px, 8vw, 110px) clamp(18px, 4vw, 24px);
}

.split {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(36px, 6vw, 82px);
}

h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.35;
}

p {
  margin: 0;
}

.prose > p,
.section-heading p {
  color: var(--muted);
  font-size: 17px;
}

.mission-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.mission-grid article,
.card,
.feature-grid article,
.problem-grid article,
.architecture article,
.advantage-grid article {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.mission-grid article {
  padding: 26px;
}

.mission-grid h3,
.feature-grid h3,
.problem-grid h3,
.architecture h3,
.advantage-grid h3 {
  margin-bottom: 10px;
}

.mission-grid p,
.card p,
.feature-grid p,
.problem-grid p,
.architecture p,
.advantage-grid p {
  color: var(--muted);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 34px;
}

.section-heading p {
  margin-top: 14px;
}

.cards {
  display: grid;
  gap: 18px;
}

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

.card {
  position: relative;
  min-height: 310px;
  padding: 30px;
}

.card-index {
  display: block;
  margin-bottom: 42px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
}

.card .sub {
  margin: 8px 0 18px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
}

.compact .card {
  min-height: auto;
}

.panel-section {
  max-width: none;
  background: var(--surface-soft);
}

.panel-section > * {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.feature-grid,
.problem-grid,
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.feature-grid article,
.problem-grid article,
.advantage-grid article {
  padding: 24px;
  box-shadow: none;
}

.module-list {
  margin-top: 22px;
  padding: 34px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 24px;
  margin-top: 22px;
}

.module-grid p {
  color: var(--muted);
}

.module-grid strong {
  color: var(--ink);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 0 0 22px;
  padding: 1px;
  background: var(--line);
  list-style: none;
}

.timeline li {
  min-height: 176px;
  padding: 22px;
  background: var(--surface);
}

.timeline strong {
  display: block;
  margin-bottom: 12px;
  color: var(--accent-dark);
  font-size: 18px;
}

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

.industry {
  max-width: none;
  color: #fff;
  background: var(--navy);
}

.industry > * {
  max-width: 1180px;
  margin-left: auto;
  margin-right: auto;
}

.industry h2,
.industry h3 {
  color: #fff;
}

.industry .section-heading p,
.industry .problem-grid p,
.industry .architecture p {
  color: rgba(255, 255, 255, 0.7);
}

.problem-grid article,
.architecture article {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
}

.architecture {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 18px;
}

.architecture article {
  padding: 26px;
}

.case-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 34px;
  align-items: center;
  margin-top: 34px;
  padding: 34px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(15, 143, 111, 0.12);
}

.case-band p {
  color: rgba(255, 255, 255, 0.74);
}

.case-band dl {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0;
  background: rgba(255, 255, 255, 0.12);
}

.case-band dl div {
  padding: 24px 18px;
  background: rgba(4, 20, 22, 0.32);
}

.case-band dt {
  font-size: clamp(34px, 4vw, 54px);
  font-weight: 900;
  line-height: 1;
}

.case-band dd {
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.68);
}

.contact {
  display: grid;
  grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(28px, 5vw, 70px);
}

.contact > div p {
  margin-top: 18px;
  color: var(--muted);
  font-size: 17px;
}

.contact-card {
  display: grid;
  gap: 16px;
  padding: 28px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.contact-card div {
  padding: 22px;
  border: 1px solid var(--line);
  background: #fbfcfb;
}

.contact-card span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.contact-card strong,
.contact-card a {
  display: block;
  color: var(--ink);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 800;
  line-height: 1.2;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(18px, 4vw, 64px);
  color: rgba(255, 255, 255, 0.7);
  background: #0b1917;
}

.site-footer strong,
.site-footer span {
  display: block;
}

.site-footer strong {
  color: #fff;
}

@media (max-width: 980px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 73px;
    right: 18px;
    left: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 14px;
    border: 1px solid var(--line);
    background: var(--surface);
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .hero-metrics,
  .cards.three,
  .feature-grid,
  .problem-grid,
  .timeline,
  .advantage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .split,
  .contact,
  .case-band {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .site-header {
    padding: 12px 16px;
  }

  .brand {
    min-width: 0;
  }

  .brand strong {
    max-width: 210px;
    font-size: 13px;
  }

  .hero {
    padding-top: 56px;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

  .hero-metrics,
  .cards.three,
  .feature-grid,
  .problem-grid,
  .architecture,
  .mission-grid,
  .module-grid,
  .timeline,
  .case-band dl,
  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .card {
    min-height: auto;
  }

  .site-footer {
    display: block;
  }

  .site-footer p {
    margin-top: 10px;
  }
}