:root {
  --ink: #173229;
  --muted: #66756f;
  --line: #dfe9e3;
  --soft: #f5faf7;
  --green: #20b957;
  --green-dark: #138a40;
  --mint: #e9faef;
  --shadow: 0 18px 50px rgba(21, 83, 48, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fbfdfb; font: 16px/1.75 "Microsoft YaHei", "PingFang SC", Arial, sans-serif; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.nav-wrap, .container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: .02em; }
.brand img { width: 38px; height: 38px; object-fit: contain; border-radius: 10px; }
.site-nav { display: flex; align-items: center; gap: 22px; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--green-dark); }
.menu-toggle { display: none; border: 1px solid var(--line); background: #fff; color: var(--ink); padding: 7px 11px; border-radius: 8px; font-size: 18px; }
.hero { padding: 78px 0 66px; background: linear-gradient(135deg, #effdf2, #fff 58%); }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 60px; }
.eyebrow { margin: 0 0 12px; color: var(--green-dark); font-weight: 800; font-size: 13px; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.25; letter-spacing: 0; }
h1 { margin: 0 0 20px; font-size: clamp(34px, 5vw, 60px); }
h2 { margin: 0 0 16px; font-size: clamp(26px, 3vw, 38px); }
h3 { margin: 0 0 10px; font-size: 20px; }
.lead { max-width: 650px; margin: 0; color: var(--muted); font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 18px; border-radius: 9px; text-decoration: none; font-weight: 800; border: 1px solid transparent; }
.button-primary { background: var(--green); color: #fff; box-shadow: 0 10px 22px rgba(32,185,87,.20); }
.button-primary:hover { background: var(--green-dark); }
.button-ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.button-ghost:hover { border-color: var(--green); color: var(--green-dark); }
.hero-shot { position: relative; max-width: 370px; margin: 0 auto; }
.hero-shot img { width: 100%; border-radius: 28px; box-shadow: var(--shadow); }
.section { padding: 74px 0; }
.section-soft { background: var(--soft); }
.section-head { max-width: 700px; margin-bottom: 30px; }
.section-head p { margin: 0; color: var(--muted); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 8px 24px rgba(28, 93, 52, .05); }
.card p { margin: 0; color: var(--muted); }
.number { display: inline-flex; width: 32px; height: 32px; align-items: center; justify-content: center; margin-bottom: 18px; border-radius: 9px; background: var(--mint); color: var(--green-dark); font-weight: 800; }
.gallery { display: grid; grid-template-columns: 1.25fr .75fr; gap: 18px; align-items: stretch; }
.gallery-main, .gallery-side figure { margin: 0; overflow: hidden; border-radius: 16px; background: #eef7f0; }
.gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.gallery-side { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.gallery-side img { width: 100%; height: 100%; min-height: 190px; object-fit: cover; }
.note { padding: 14px 16px; border-left: 4px solid var(--green); background: var(--mint); color: #315b42; border-radius: 8px; }
.download-box { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px; background: #143729; color: #fff; border-radius: 16px; }
.download-box p { margin: 4px 0 0; color: #c6e8d1; }
.download-box .button-ghost { background: #fff; color: var(--ink); border-color: #fff; white-space: nowrap; }
.external-note { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.article-list { display: grid; gap: 16px; }
.article-item { display: grid; grid-template-columns: 180px 1fr; gap: 20px; align-items: center; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; }
.article-item img { width: 180px; height: 120px; object-fit: cover; border-radius: 10px; }
.article-item p { margin: 0; color: var(--muted); }
.article-meta { color: var(--green-dark); font-size: 13px; font-weight: 800; }
.prose { max-width: 780px; }
.prose p, .prose li { color: #4d6158; }
.prose ul, .prose ol { padding-left: 22px; }
.faq-list { display: grid; gap: 12px; }
details { padding: 18px 20px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
summary { cursor: pointer; font-weight: 800; }
details p { margin: 12px 0 0; color: var(--muted); }
.site-footer { padding: 30px 0; background: #12251d; color: #b7c9bf; }
.footer-grid { display: flex; justify-content: space-between; gap: 20px; }
.site-footer p { margin: 0; font-size: 13px; }
.site-footer a { color: #e4f6e9; text-decoration: none; }
.page-hero { padding: 62px 0 42px; background: var(--soft); border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(32px, 5vw, 52px); }
.breadcrumbs { margin: 0 0 16px; color: var(--green-dark); font-size: 13px; }
@media (max-width: 820px) {
  .nav-wrap, .container { width: min(100% - 28px, 680px); }
  .menu-toggle { display: block; }
  .site-nav { display: none; position: absolute; left: 14px; right: 14px; top: 66px; flex-direction: column; align-items: stretch; gap: 0; padding: 8px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 11px 12px; }
  .hero { padding: 52px 0 42px; }
  .hero-grid, .gallery, .grid-2 { grid-template-columns: 1fr; gap: 28px; }
  .grid-3 { grid-template-columns: 1fr; }
  .hero-shot { max-width: 300px; }
  .gallery-side { grid-template-columns: repeat(2, 1fr); }
  .download-box, .footer-grid { align-items: flex-start; flex-direction: column; }
  .article-item { grid-template-columns: 1fr; }
  .article-item img { width: 100%; height: 190px; }
}