:root {
  --green-900: #123d28;
  --green-700: #27663f;
  --green-500: #5a9c55;
  --orange-600: #f27616;
  --orange-500: #ff8a1f;
  --ink: #25302b;
  --muted: #65736b;
  --line: #dbe4dc;
  --paper: #ffffff;
  --mist: #eef7f2;
  --sky: #eaf4f8;
  --warm: #fff8ef;
  --shadow: 0 18px 50px rgba(24, 54, 38, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  background:
    linear-gradient(180deg, rgba(238, 247, 242, 0.9), rgba(255, 255, 255, 0.92) 34rem),
    var(--paper);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 76px;
  padding: 14px clamp(22px, 5vw, 72px);
  border-bottom: 1px solid rgba(219, 228, 220, 0.82);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 238px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--orange-600), var(--green-700));
}

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

.brand strong {
  font-size: 18px;
  color: var(--green-900);
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex: 1;
  color: #30423a;
  font-size: 14px;
}

.nav a {
  padding: 8px 0;
}

.nav a:hover {
  color: var(--orange-600);
}

.nav-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  font-weight: 700;
  white-space: nowrap;
}

.nav-action,
.button.primary {
  color: #fff;
  background: var(--orange-600);
  box-shadow: 0 10px 24px rgba(242, 118, 22, 0.24);
}

.button.secondary {
  color: var(--green-900);
  border: 1px solid rgba(39, 102, 63, 0.35);
  background: rgba(255, 255, 255, 0.88);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: clamp(28px, 4vw, 58px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: clamp(34px, 6vw, 82px) clamp(22px, 5vw, 72px) 58px;
}

.hero-copy {
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--orange-600);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

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

h1 {
  margin-bottom: 20px;
  color: var(--green-900);
  font-size: clamp(42px, 5.4vw, 76px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lead {
  color: #44564d;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 30px 0;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  max-width: 560px;
}

.hero-stats div {
  min-height: 86px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
}

.hero-stats strong {
  display: block;
  color: var(--green-700);
  font-size: 28px;
}

.hero-stats span {
  color: var(--muted);
  font-size: 13px;
}

.hero-media {
  margin: 0;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: var(--shadow);
  background: var(--sky);
}

.hero-media img {
  width: 100%;
  height: min(650px, 74vh);
  object-fit: cover;
}

.section {
  padding: 82px clamp(22px, 5vw, 72px);
}

.section-heading {
  max-width: 860px;
  margin-bottom: 30px;
}

.section-heading.compact {
  max-width: none;
}

.section-heading h2 {
  margin-bottom: 12px;
  color: var(--green-900);
  font-size: clamp(30px, 3.2vw, 48px);
  line-height: 1.15;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.difference {
  background: linear-gradient(180deg, #fff, var(--mist));
}

.difference-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.difference-grid article,
.module-grid div,
.team-grid div,
.roadmap-grid div,
.case-points {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
}

.difference-grid article {
  min-height: 230px;
  padding: 22px;
}

.difference-grid span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 28px;
  border-radius: 8px;
  color: #fff;
  font-weight: 800;
  background: var(--green-700);
}

.difference-grid article:nth-child(2n) span {
  background: var(--orange-600);
}

.difference-grid h3,
.case-points h3,
.module-grid h3 {
  color: var(--green-900);
  font-size: 21px;
}

.difference-grid p,
.case-points p,
.case-points li,
.module-grid p,
.roadmap-grid p {
  color: var(--muted);
  line-height: 1.75;
}

.process {
  background: var(--paper);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.timeline div {
  position: relative;
  min-height: 170px;
  padding: 20px;
  border: 1px solid rgba(39, 102, 63, 0.22);
  border-radius: 8px;
  background: linear-gradient(180deg, #fff, #f7fbf9);
}

.timeline strong {
  display: block;
  width: 34px;
  height: 34px;
  margin-bottom: 22px;
  border-radius: 8px;
  color: #fff;
  line-height: 34px;
  text-align: center;
  background: var(--orange-600);
}

.timeline span {
  display: block;
  color: var(--green-900);
  font-size: 18px;
  font-weight: 800;
}

.timeline p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.wide-image,
.case-layout figure,
.evidence-grid figure {
  margin: 0;
}

.wide-image {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.wide-image img {
  width: 100%;
  max-height: 680px;
  object-fit: cover;
}

.case {
  background: linear-gradient(180deg, var(--warm), #fff);
}

.case-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  gap: 24px;
  align-items: stretch;
}

.case-layout figure,
.evidence-grid figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(27, 56, 41, 0.1);
}

.case-layout img {
  width: 100%;
  height: 100%;
  min-height: 440px;
  object-fit: cover;
}

figcaption {
  padding: 14px 16px 16px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.case-points {
  padding: 28px;
}

.case-points ul {
  margin: 20px 0 0;
  padding-left: 20px;
}

.evidence {
  background: var(--paper);
}

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

.evidence-grid img {
  width: 100%;
  height: 330px;
  object-fit: cover;
}

.modules {
  background: var(--sky);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.module-grid div {
  min-height: 190px;
  padding: 24px;
}

.team {
  background: #fff;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.team-grid div {
  min-height: 112px;
  padding: 22px;
}

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

.team-grid strong {
  color: var(--green-900);
  font-size: 19px;
}

.team-grid span {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.6;
}

.roadmap {
  background: linear-gradient(180deg, var(--mist), #fff);
}

.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.roadmap-grid div {
  padding: 24px;
}

.roadmap-grid span {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--orange-600);
  font-weight: 800;
}

.roadmap-grid strong {
  display: block;
  color: var(--green-900);
  font-size: 22px;
}

.roadmap-grid p {
  margin: 14px 0 0;
}

.contact {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 clamp(22px, 5vw, 72px) 72px;
  padding: 34px;
  border-radius: 8px;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(18, 61, 40, 0.96), rgba(39, 102, 63, 0.88)),
    var(--green-900);
}

.contact .eyebrow,
.contact h2,
.contact p {
  color: #fff;
}

.contact h2 {
  margin-bottom: 12px;
  font-size: clamp(28px, 3vw, 44px);
}

.contact p {
  margin-bottom: 0;
  line-height: 1.8;
}

@media (max-width: 1100px) {
  .nav {
    display: none;
  }

  .site-header {
    justify-content: space-between;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-media img {
    height: auto;
  }

  .difference-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .difference-grid article:last-child,
  .timeline div:last-child {
    grid-column: span 2;
  }

  .module-grid,
  .evidence-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .site-header {
    min-height: 66px;
    padding: 12px 16px;
  }

  .brand {
    min-width: 0;
  }

  .brand small,
  .nav-action {
    display: none;
  }

  .hero,
  .section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .lead {
    font-size: 16px;
  }

  .hero-stats,
  .difference-grid,
  .timeline,
  .case-layout,
  .evidence-grid,
  .module-grid,
  .team-grid,
  .roadmap-grid {
    grid-template-columns: 1fr;
  }

  .difference-grid article:last-child,
  .timeline div:last-child {
    grid-column: auto;
  }

  .case-layout img,
  .evidence-grid img {
    height: auto;
    min-height: 0;
  }

  .contact {
    display: block;
    margin-left: 16px;
    margin-right: 16px;
    padding: 24px;
  }

  .contact .button {
    margin-top: 18px;
  }
}