:root {
  color-scheme: light;
  --ink: #17211d;
  --muted: #5c6761;
  --paper: #f8f7f1;
  --white: #ffffff;
  --green: #1f5e42;
  --green-deep: #10382b;
  --water: #24799b;
  --brick: #a94232;
  --gold: #c58a2c;
  --line: rgba(23, 33, 29, 0.14);
  --shadow: 0 18px 50px rgba(16, 56, 43, 0.16);
}

* {
  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 SC",
    Arial,
    sans-serif;
  line-height: 1.65;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(197, 138, 44, 0.82);
  outline-offset: 4px;
}

button {
  font: inherit;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 clamp(18px, 4vw, 56px);
  color: var(--white);
  transition:
    background 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  background: rgba(248, 247, 241, 0.95);
  color: var(--ink);
  box-shadow: 0 10px 34px rgba(23, 33, 29, 0.12);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.15;
}

.brand strong {
  font-size: 18px;
}

.brand small {
  margin-top: 4px;
  font-size: 12px;
  opacity: 0.8;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  font-size: 14px;
  font-weight: 700;
}

.desktop-nav a {
  position: relative;
  padding: 10px 0;
}

.desktop-nav a::after {
  position: absolute;
  right: 0;
  bottom: 4px;
  left: 0;
  height: 2px;
  content: "";
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

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

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: inherit;
  background: transparent;
  border: 1px solid currentColor;
  border-radius: 8px;
}

.menu-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.mobile-nav {
  position: fixed;
  top: 72px;
  right: 12px;
  left: 12px;
  z-index: 19;
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 12px;
  background: rgba(248, 247, 241, 0.98);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.mobile-nav.is-open {
  display: grid;
}

.mobile-nav a {
  padding: 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--green-deep);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.hero {
  position: relative;
  min-height: 84vh;
  overflow: hidden;
  color: var(--white);
  background: var(--green-deep);
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(12, 32, 25, 0.8) 0%, rgba(12, 32, 25, 0.52) 36%, rgba(12, 32, 25, 0.12) 72%),
    linear-gradient(0deg, rgba(12, 32, 25, 0.46), rgba(12, 32, 25, 0.02) 52%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 760px;
  min-height: 84vh;
  padding: 120px clamp(20px, 7vw, 88px) 72px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero .eyebrow {
  color: #f5c86b;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(56px, 10vw, 124px);
  line-height: 0.96;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 620px;
  margin-bottom: 30px;
  font-size: clamp(19px, 2.6vw, 30px);
  line-height: 1.35;
  font-weight: 700;
}

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

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-action {
  color: var(--green-deep);
  background: #f5c86b;
}

.secondary-action {
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.75);
}

.intro-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.strip-item {
  min-height: 116px;
  padding: 24px clamp(18px, 3vw, 36px);
  background: var(--white);
}

.strip-item strong,
.strip-item span {
  display: block;
}

.strip-item strong {
  color: var(--green);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
}

.strip-item span {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: clamp(64px, 8vw, 112px) clamp(20px, 6vw, 80px);
}

.section-light {
  background: var(--paper);
}

.section-deep {
  color: var(--white);
  background: var(--green-deep);
}

.section-routes {
  background: #eef4f0;
}

.section-news {
  background: #ffffff;
}

.section-heading {
  max-width: 820px;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.section-heading.compact {
  max-width: 720px;
}

.section-heading h2,
.split-layout h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4.8vw, 58px);
  line-height: 1.12;
  letter-spacing: 0;
}

.section-heading p:not(.eyebrow),
.split-layout p {
  color: var(--muted);
  font-size: clamp(16px, 2vw, 19px);
}

.section-deep .section-heading p:not(.eyebrow),
.closing .closing-copy p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.76);
}

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

.position-grid article,
.goods-grid article,
.timeline article {
  border-radius: 8px;
}

.position-grid article {
  min-height: 260px;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
}

.number {
  display: inline-block;
  margin-bottom: 54px;
  color: var(--brick);
  font-weight: 900;
}

.position-grid h3,
.goods-grid h3,
.timeline h3 {
  margin-bottom: 10px;
  font-size: 22px;
  line-height: 1.25;
}

.position-grid p,
.goods-grid p,
.timeline p,
.resource-card span {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

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

.resource-card {
  position: relative;
  min-height: 320px;
  padding: 24px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
}

.resource-card::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  content: "";
}

.resource-card p {
  margin-bottom: 72px;
  font-size: 14px;
  font-weight: 800;
}

.resource-card h3 {
  margin-bottom: 16px;
  font-size: 26px;
  line-height: 1.18;
}

.resource-card span {
  color: rgba(255, 255, 255, 0.76);
}

.accent-green::before {
  background: #68b77b;
}

.accent-red::before {
  background: #d8654f;
}

.accent-blue::before {
  background: #58a8c8;
}

.accent-gold::before {
  background: #f5c86b;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 1.05fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
}

.column-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.column-list a {
  min-height: 58px;
  padding: 16px;
  border-radius: 8px;
  font-weight: 800;
}

.column-list a {
  color: var(--green-deep);
  background: var(--white);
  border: 1px solid var(--line);
}

.column-list a:hover,
.column-list a:focus-visible {
  color: var(--white);
  background: var(--green);
}

.route-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.route-tab {
  min-height: 44px;
  padding: 10px 16px;
  color: var(--green-deep);
  cursor: pointer;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.route-tab.active {
  color: var(--white);
  background: var(--green);
  border-color: var(--green);
}

.route-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 1.1fr);
  gap: 24px;
  min-height: 320px;
  padding: clamp(24px, 4vw, 42px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.route-panel-main h3 {
  margin-bottom: 16px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.14;
}

.route-panel-main p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.route-steps {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: route;
}

.route-steps li {
  position: relative;
  min-height: 54px;
  padding: 14px 16px 14px 54px;
  background: #f4f7f5;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 800;
}

.route-steps li::before {
  position: absolute;
  top: 13px;
  left: 14px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: var(--white);
  content: counter(route);
  counter-increment: route;
  background: var(--brick);
  border-radius: 50%;
  font-size: 13px;
}

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

.goods-grid article {
  min-height: 190px;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
}

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

.timeline article {
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--line);
  background: #f8f7f1;
}

.timeline time {
  display: block;
  margin-bottom: 42px;
  color: var(--water);
  font-weight: 900;
}

.closing {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.82fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: end;
  padding: clamp(64px, 8vw, 112px) clamp(20px, 6vw, 80px);
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(16, 56, 43, 0.96), rgba(31, 94, 66, 0.88)),
    url("assets/chunhua-hero-500k.jpg") center / cover;
}

.closing-copy {
  max-width: 760px;
}

.closing-copy h2 {
  margin-bottom: 16px;
  font-size: clamp(34px, 5.6vw, 68px);
  line-height: 1.08;
  letter-spacing: 0;
}

.closing-copy p:not(.eyebrow) {
  max-width: 600px;
  margin-bottom: 28px;
  font-size: clamp(17px, 2vw, 20px);
}

.closing-points {
  display: grid;
  gap: 12px;
}

.closing-points article {
  min-height: 92px;
  padding: 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
}

.closing-points span,
.closing-points strong {
  display: block;
}

.closing-points span {
  margin-bottom: 8px;
  color: #f5c86b;
  font-size: 13px;
  font-weight: 900;
}

.closing-points strong {
  font-size: 22px;
  line-height: 1.22;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px clamp(20px, 6vw, 80px);
  color: var(--white);
  background: #101815;
}

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

.site-footer span {
  color: rgba(255, 255, 255, 0.68);
  font-size: 13px;
}

.site-footer a {
  font-weight: 800;
}

@media (max-width: 1080px) {
  .position-grid,
  .resource-grid,
  .goods-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split-layout,
  .route-panel,
  .closing {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 64px;
    padding: 0 16px;
  }

  .desktop-nav {
    display: none;
  }

  .menu-button {
    display: block;
  }

  .mobile-nav {
    top: 64px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand small {
    display: none;
  }

  .hero,
  .hero-content {
    min-height: 78vh;
  }

  .hero img {
    object-position: 56% center;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgba(12, 32, 25, 0.82) 0%, rgba(12, 32, 25, 0.54) 58%, rgba(12, 32, 25, 0.22) 100%),
      linear-gradient(0deg, rgba(12, 32, 25, 0.55), rgba(12, 32, 25, 0.08) 60%);
  }

  .hero-content {
    padding: 108px 20px 58px;
  }

  h1 {
    font-size: clamp(56px, 20vw, 90px);
  }

    .intro-strip,
    .position-grid,
    .resource-grid,
    .goods-grid,
    .timeline,
    .column-list {
    grid-template-columns: 1fr;
  }

  .strip-item {
    min-height: 96px;
  }

  .section {
    padding: 58px 18px;
  }

  .position-grid article,
  .resource-card,
  .timeline article {
    min-height: auto;
  }

  .number,
  .resource-card p,
  .timeline time {
    margin-bottom: 28px;
  }

  .route-tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .route-tab {
    padding-right: 10px;
    padding-left: 10px;
  }

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

@media (max-width: 420px) {
  .mobile-nav {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .primary-action,
  .secondary-action {
    width: 100%;
  }

  .route-tabs {
    grid-template-columns: 1fr;
  }

  .route-panel {
    padding: 20px;
  }
}