:root {
  --green-900: #1c3a28;
  --green-800: #244a33;
  --green-700: #2f6b43;
  --green-600: #3a824f;
  --green-500: #4a9d63;
  --green-100: #eaf2ec;
  --ink: #1e2a22;
  --muted: #5a6960;
  --line: #e0e7e1;
  --bg: #ffffff;
  --bg-soft: #f5f8f5;
  --radius: 14px;
  --shadow: 0 16px 36px -22px rgba(28, 58, 40, .4);
  --max: 1160px;
  --serif: "Songti SC", "STSong", "SimSun", Georgia, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; }

/* 按钮 */
.btn { display: inline-block; padding: 13px 32px; border-radius: 4px; font-size: 15px; font-weight: 600; transition: .25s; cursor: pointer; border: none; }
.btn-primary { background: var(--green-700); color: #fff; }
.btn-primary:hover { background: var(--green-800); }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.55); }
.btn-ghost:hover { background: rgba(255,255,255,.12); }

/* 导航 */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 50; transition: .3s; border-bottom: 1px solid transparent; }
.site-header.scrolled { background: rgba(255,255,255,.97); border-bottom-color: var(--line); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.scrolled .brand { color: var(--ink); }
.brand-mark { width: 42px; height: 42px; border-radius: 6px; display: grid; place-items: center; background: var(--green-700); color: #fff; font-family: var(--serif); font-weight: 700; font-size: 20px; }
.brand-text strong { display: block; font-size: 18px; line-height: 1.2; font-family: var(--serif); }
.brand-text em { font-style: normal; font-size: 11px; letter-spacing: 2px; opacity: .7; }
.nav { display: flex; gap: 28px; }
.nav a { color: #fff; font-size: 15px; font-weight: 500; position: relative; }
.scrolled .nav a { color: var(--ink); }
.nav a::after { content: ""; position: absolute; left: 0; bottom: -6px; width: 0; height: 2px; background: var(--green-600); transition: width .25s; }
.nav a:hover::after { width: 100%; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 26px; height: 2px; background: #fff; transition: .3s; }
.scrolled .nav-toggle span { background: var(--ink); }

/* 首屏 */
.hero { position: relative; min-height: 92vh; display: flex; align-items: center; background: linear-gradient(120deg, #14271b 0%, #244a33 55%, #2f6b43 100%); overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background:
  radial-gradient(circle at 78% 18%, rgba(255,255,255,.08), transparent 45%),
  linear-gradient(180deg, rgba(20,39,27,.15), rgba(20,39,27,.5)); }
.hero-sub-page { min-height: 70vh; }
.hero-inner { position: relative; z-index: 2; color: #fff; padding-top: 90px; max-width: 760px; }
.hero-eyebrow { display: inline-block; padding: 6px 16px; border: 1px solid rgba(255,255,255,.35); border-radius: 3px; font-size: 13px; letter-spacing: 2px; margin-bottom: 26px; }
.hero-title { font-size: clamp(30px, 5vw, 56px); line-height: 1.3; margin-bottom: 22px; }
.hero-sub { font-size: clamp(15px, 2vw, 18px); opacity: .92; margin-bottom: 36px; font-family: inherit; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* section 通用 */
.section { padding: 92px 0; }
.section-tint { background: var(--bg-soft); }
.section-dark { background: linear-gradient(135deg, #1c3a28, #2f6b43); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 54px; }
.kicker { color: var(--green-700); font-size: 13px; font-weight: 700; letter-spacing: 3px; margin-bottom: 12px; }
.kicker-light { color: #a9d6b8; }
.section h2 { font-size: clamp(24px, 3.2vw, 34px); }

/* 总体定位 */
.about-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 56px; align-items: center; }
.about-text h2 { margin-bottom: 18px; }
.about-text p { color: var(--muted); margin-bottom: 16px; }
.about-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.fact { background: var(--green-100); border-radius: var(--radius); padding: 26px 20px; text-align: center; }
.fact b { display: block; font-family: var(--serif); font-size: 42px; color: var(--green-700); line-height: 1; margin-bottom: 8px; }
.fact span { font-size: 14px; color: var(--muted); }

/* 产业链 */
.chain { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: c; }
.chain li { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; position: relative; transition: .3s; }
.chain li:hover { border-color: var(--green-500); transform: translateY(-4px); box-shadow: var(--shadow); }
.chain li b { font-family: var(--serif); font-size: 22px; color: var(--green-500); }
.chain li h3 { font-size: 18px; margin: 8px 0 8px; }
.chain li p { color: var(--muted); font-size: 14px; }

/* 四大中心手风琴 */
.centers { display: grid; gap: 14px; max-width: 880px; margin: 0 auto; }
.center { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.center-head { width: 100%; display: flex; align-items: center; gap: 16px; padding: 22px 26px; background: none; border: none; cursor: pointer; text-align: left; font-family: var(--serif); }
.center-no { width: 34px; height: 34px; flex: none; border-radius: 50%; display: grid; place-items: center; background: var(--green-100); color: var(--green-700); font-size: 16px; }
.center-name { flex: 1; font-size: 20px; font-weight: 700; }
.center-arrow { width: 12px; height: 12px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); transition: .3s; }
.center.open .center-arrow { transform: rotate(-135deg); }
.center-body { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.center.open .center-body { max-height: 320px; }
.center-def { padding: 0 26px; color: var(--muted); }
.dept-tags { display: flex; flex-wrap: wrap; gap: 10px; padding: 16px 26px 26px; }
.dept-tags span { background: var(--green-100); color: var(--green-700); padding: 7px 16px; border-radius: 3px; font-size: 14px; }
.center-def + .dept-tags { padding-top: 14px; }

/* 产业布局 */
.layout-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.layout-block { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 38px; }
.layout-block h2 { margin-bottom: 14px; }
.layout-block p { color: var(--muted); margin-bottom: 20px; }
.layout-block .dept-tags { padding: 0; }

/* 卡片 */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px; transition: .3s; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--green-500); }
.card b { display: block; font-family: var(--serif); font-size: 19px; margin-bottom: 12px; color: var(--ink); }
.card p { color: var(--muted); font-size: 14.5px; }

/* 数字运营 / 跨境 */
.cross-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 50px; align-items: center; color: #fff; }
.cross-text h2 { margin-bottom: 16px; }
.cross-text p { opacity: .88; }
.cross-cols { display: grid; gap: 16px; }
.cross-col { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16); border-radius: var(--radius); padding: 22px 26px; }
.cross-col h4 { font-family: var(--serif); font-size: 18px; margin-bottom: 6px; color: #a9d6b8; }
.cross-col p { opacity: .9; font-size: 15px; }

/* 经营主体 */
.entities { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.entity { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px; transition: .3s; }
.entity h3 { font-size: 18px; margin-bottom: 10px; }
.entity p { color: var(--muted); font-size: 14.5px; }
.entity-link { display: block; border-color: var(--green-500); box-shadow: var(--shadow); position: relative; }
.entity-link:hover { transform: translateY(-4px); }
.entity-more { display: inline-block; margin-top: 14px; color: var(--green-700); font-weight: 600; font-size: 14px; }

/* 联系 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.contact-text h2 { margin-bottom: 14px; }
.contact-text > p { color: var(--muted); margin-bottom: 24px; }
.contact-list { list-style: none; display: grid; gap: 14px; }
.contact-list li { display: flex; gap: 16px; font-size: 15px; }
.contact-list span { color: var(--green-700); font-weight: 700; min-width: 56px; }
.contact-form { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; display: grid; gap: 16px; }
.contact-form label { display: grid; gap: 7px; font-size: 14px; font-weight: 600; }
.contact-form input, .contact-form textarea { border: 1px solid var(--line); border-radius: 6px; padding: 12px 14px; font: inherit; font-weight: 400; background: #fff; resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--green-500); border-color: transparent; }
.contact-form small { color: var(--muted); font-weight: 400; }

/* 页脚 */
.site-footer { background: var(--green-900); color: #fff; }
.footer-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 24px; padding: 46px 24px; }
.footer-brand strong { font-family: var(--serif); font-size: 19px; }
.footer-brand p { opacity: .8; font-size: 14px; margin-top: 6px; }
.footer-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-nav a { opacity: .85; font-size: 14.5px; transition: .2s; }
.footer-nav a:hover { opacity: 1; color: #a9d6b8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); }
.footer-bottom-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; padding: 18px 24px; font-size: 13.5px; opacity: .82; }
.beian:hover { color: #a9d6b8; opacity: 1; text-decoration: underline; }

/* 滚动出现 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* 响应式 */
@media (max-width: 980px) {
  .about-grid, .contact-grid, .layout-grid, .cross-grid { grid-template-columns: 1fr; gap: 36px; }
  .chain, .cards { grid-template-columns: repeat(2, 1fr); }
  .entities { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav { position: fixed; top: 72px; right: 0; width: 72%; max-width: 300px; height: calc(100vh - 72px); background: #fff; flex-direction: column; gap: 0; padding: 12px 0; transform: translateX(110%); transition: transform .3s; box-shadow: var(--shadow); }
  .nav.open { transform: none; }
  .nav a { color: var(--ink); padding: 14px 28px; width: 100%; }
  .nav-toggle { display: flex; }
  .footer-top { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .chain, .cards, .entities, .about-facts { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
}