:root {
  color-scheme: light;
  --ink: #101816;
  --muted: #5c6763;
  --paper: #f4f7f5;
  --line: #dce4e0;
  --green: #087c60;
  --green-dark: #0b1713;
  --mint: #bce7d8;
  --coral: #f35f49;
  --yellow: #f2b51d;
  --page: min(1120px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  line-height: 1.65;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.site-header {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 50%;
  width: var(--page);
  min-height: 76px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.26);
}
.brand { font-size: 20px; font-weight: 800; text-decoration: none; }
nav { display: flex; gap: 30px; }
nav a { font-size: 15px; text-decoration: none; color: rgba(255,255,255,.84); }
nav a:hover, nav a:focus-visible { color: #fff; }

.hero {
  min-height: min(780px, 88vh);
  position: relative;
  display: grid;
  align-items: center;
  color: #fff;
  background:
    linear-gradient(90deg, rgba(5,16,13,.90) 0%, rgba(5,16,13,.72) 49%, rgba(5,16,13,.18) 100%),
    url("/assets/wuhan-city.jpg") center 44% / cover no-repeat;
}
.hero-content { width: var(--page); margin: 36px auto 0; }
.eyebrow {
  margin: 0 0 16px;
  color: var(--green);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}
.hero .eyebrow { color: var(--mint); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 10px; font-size: clamp(58px, 8vw, 88px); line-height: 1.08; letter-spacing: 0; }
.hero-lead { margin: 0 0 16px; font-size: clamp(25px, 3vw, 38px); font-weight: 800; line-height: 1.32; }
.hero-copy { max-width: 700px; margin-bottom: 34px; color: rgba(255,255,255,.8); font-size: 18px; }
.primary-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 24px;
  background: var(--coral);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  border-radius: 6px;
}
.primary-link:hover, .primary-link:focus-visible { background: #df4e39; }
.hero-footnote {
  position: absolute;
  left: 50%;
  bottom: 30px;
  width: var(--page);
  transform: translateX(-50%);
  margin: 0;
  color: rgba(255,255,255,.62);
  font-size: 13px;
}

.section { padding: 104px 0; }
.section-heading { width: var(--page); margin: 0 auto 58px; max-width: 1120px; }
.section-heading.compact { margin-bottom: 42px; }
h2 { margin-bottom: 20px; font-size: clamp(34px, 4vw, 50px); line-height: 1.2; letter-spacing: 0; }
.section-heading > p:last-child { max-width: 820px; margin-bottom: 0; color: var(--muted); font-size: 18px; }

.product-showcase {
  width: var(--page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 42px;
  align-items: end;
}
figure { margin: 0; }
figure img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: contain;
  background: var(--green-dark);
  border: 1px solid #1c2c27;
}
figcaption { display: grid; gap: 6px; margin-top: 20px; }
figcaption strong { font-size: 20px; }
figcaption span { color: var(--muted); font-size: 15px; }

.workflow { background: var(--paper); }
.workflow-list {
  width: var(--page);
  margin: 0 auto;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--line);
}
.workflow-list li { padding: 30px 30px 0 0; }
.workflow-list li + li { padding-left: 30px; border-left: 1px solid var(--line); }
.workflow-list span { display: block; margin-bottom: 38px; color: var(--green); font-weight: 800; }
.workflow-list strong { display: block; margin-bottom: 12px; font-size: 22px; }
.workflow-list p { margin: 0; color: var(--muted); font-size: 15px; }

.trust { padding: 0; display: grid; grid-template-columns: 1fr 1fr; min-height: 640px; }
.trust-image {
  min-height: 520px;
  background: url("/assets/wuhan-city.jpg") center / cover no-repeat;
}
.trust-content { padding: 88px max(44px, calc((100vw - 1120px) / 2)) 88px 70px; background: var(--green-dark); color: #fff; }
.trust-content .eyebrow { color: var(--mint); }
.trust-content h2 { max-width: 620px; }
dl { margin: 40px 0 0; }
dl div { padding: 20px 0; border-top: 1px solid rgba(255,255,255,.17); }
dt { margin-bottom: 6px; font-size: 18px; font-weight: 800; }
dd { margin: 0; color: rgba(255,255,255,.68); font-size: 15px; }

.data-grid {
  width: var(--page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}
.data-grid article { padding: 42px 38px 42px 0; }
.data-grid article + article { padding-left: 38px; border-left: 1px solid var(--line); }
.data-grid span { color: var(--coral); font-size: 14px; font-weight: 800; }
.data-grid h3 { margin: 16px 0 12px; font-size: 24px; }
.data-grid p { margin: 0; color: var(--muted); font-size: 15px; }
.privacy-note, .stage-note { width: var(--page); margin: 30px auto 0; color: var(--green); font-size: 14px; font-weight: 700; }

.progress { background: var(--paper); }
.progress-grid {
  width: var(--page);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.progress-grid div { padding-top: 28px; border-top: 5px solid var(--green); }
.progress-grid div:nth-child(1) { border-color: var(--coral); }
.progress-grid div:nth-child(2) { border-color: var(--yellow); }
.progress-grid div:nth-child(4) { border-color: #357cda; }
.progress-grid strong { display: block; font-size: clamp(40px, 5vw, 62px); line-height: 1.1; }
.progress-grid span { display: block; margin-top: 12px; color: var(--muted); }

.closing {
  padding: 120px max(20px, calc((100vw - 1120px) / 2));
  color: #fff;
  background:
    linear-gradient(90deg, rgba(5,16,13,.92), rgba(5,16,13,.55)),
    url("/assets/xian-city.jpg") center / cover no-repeat;
}
.closing .eyebrow { color: var(--mint); }
.closing h2 { max-width: 850px; }
.closing > p:last-child { margin: 24px 0 0; color: rgba(255,255,255,.7); font-size: 18px; }

footer {
  width: var(--page);
  min-height: 104px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
  color: var(--muted);
  font-size: 13px;
}
footer strong { margin-right: auto; color: var(--ink); font-size: 16px; }

@media (max-width: 800px) {
  :root { --page: min(100% - 32px, 680px); }
  .site-header { min-height: 64px; }
  nav { gap: 16px; }
  nav a:nth-child(3), nav a:nth-child(4) { display: none; }
  .hero { min-height: 720px; background-position: 62% center; }
  .hero-content { margin-top: 10px; }
  .hero-copy { max-width: 520px; font-size: 16px; }
  .section { padding: 76px 0; }
  .section-heading { margin-bottom: 42px; }
  .product-showcase { grid-template-columns: 1fr; max-width: 420px; gap: 58px; }
  .workflow-list, .data-grid, .progress-grid { grid-template-columns: 1fr 1fr; }
  .workflow-list li:nth-child(3) { padding-left: 0; border-left: 0; }
  .workflow-list li { padding-bottom: 34px; }
  .trust { grid-template-columns: 1fr; }
  .trust-image { min-height: 390px; }
  .trust-content { padding: 70px max(16px, calc((100vw - 680px) / 2)); }
  .data-grid article:nth-child(3) { grid-column: 1 / -1; padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  footer { flex-wrap: wrap; gap: 12px 24px; padding: 24px 0; }
  footer strong { width: 100%; }
}

@media (max-width: 520px) {
  h1 { font-size: 56px; }
  h2 { font-size: 34px; }
  .hero-lead { font-size: 26px; }
  .workflow-list, .data-grid, .progress-grid { grid-template-columns: 1fr; }
  .workflow-list li, .workflow-list li + li { padding: 24px 0; border-left: 0; border-top: 1px solid var(--line); }
  .workflow-list span { margin-bottom: 16px; }
  .data-grid article, .data-grid article + article { padding: 32px 0; border-left: 0; border-top: 1px solid var(--line); }
  .data-grid article:first-child { border-top: 0; }
  .data-grid article:nth-child(3) { grid-column: auto; }
  .progress-grid { gap: 34px; }
  .closing { padding-top: 84px; padding-bottom: 84px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}