:root {
  --ink: #16221d;
  --muted: #65716a;
  --line: #dce3de;
  --paper: #f7f9f7;
  --green: #22724e;
  --mint: #dceee4;
  --coral: #d86e50;
  --white: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
}

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

.shell { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }

.site-header { position: absolute; z-index: 2; top: 0; width: 100%; color: var(--white); }

.header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; }

.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; }

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: var(--ink);
  background: #b8e0c6;
  font-family: Georgia, serif;
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
}

nav { display: flex; gap: 28px; font-size: 14px; }
nav a { opacity: .9; }
nav a:hover { opacity: 1; color: #b8e0c6; }

.hero { position: relative; min-height: 690px; color: var(--white); overflow: hidden; display: flex; align-items: center; }
.hero-image { position: absolute; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-shade { position: absolute; inset: 0; background: rgba(10, 23, 17, .66); }
.hero-content { position: relative; padding: 126px 0 100px; }

.eyebrow { margin: 0 0 14px; color: #b8e0c6; font-size: 12px; font-weight: 700; line-height: 1.4; letter-spacing: 1.6px; }
.eyebrow.ink { color: var(--green); }

h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 670px; margin-bottom: 22px; font-size: 64px; font-weight: 700; line-height: 1.18; }
h2 { margin-bottom: 0; font-size: 42px; line-height: 1.28; }
h3 { margin-bottom: 10px; font-size: 22px; }
.hero-copy { max-width: 520px; margin-bottom: 34px; color: rgba(255,255,255,.82); font-size: 19px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; }
.hero-meta span { border: 1px solid rgba(255,255,255,.42); padding: 6px 14px; font-size: 13px; }

.section { padding: 112px 0; }
.service-section { background: var(--white); }
.split-heading { display: grid; grid-template-columns: 1fr minmax(260px, 390px); align-items: end; gap: 60px; margin-bottom: 58px; }
.split-heading > p { margin: 0; color: var(--muted); font-size: 17px; }

.service-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.service-item { min-height: 280px; padding: 28px 30px 26px 0; border-bottom: 1px solid var(--line); }
.service-item:not(:first-child) { padding-left: 30px; border-left: 1px solid var(--line); }
.service-item p { max-width: 260px; margin: 0; color: var(--muted); }
.service-index { display: block; margin-bottom: 60px; color: var(--coral); font-size: 13px; font-weight: 700; }

.product-section { background: var(--mint); }
.product-layout { display: grid; grid-template-columns: minmax(240px, .75fr) 1.25fr; gap: 96px; }
.product-aside { position: sticky; top: 24px; align-self: start; }
.product-list { border-top: 1px solid rgba(22,34,29,.25); }
.product-list article { display: grid; grid-template-columns: 170px 1fr; gap: 32px; padding: 28px 0; border-bottom: 1px solid rgba(22,34,29,.25); }
.product-list span { font-size: 20px; font-weight: 700; }
.product-list p { margin: 0; color: #456152; }

.security-section { background: var(--ink); color: var(--white); }
.security-layout { display: grid; grid-template-columns: 1fr minmax(280px, 470px); gap: 96px; align-items: end; }
.security-copy { color: #cfdbd3; font-size: 17px; }
.security-copy p:last-child { margin-bottom: 0; }

.site-footer { background: #0d1612; color: #d4dfd8; }
.footer-main { display: flex; justify-content: space-between; gap: 32px; padding: 54px 0 38px; }
.footer-brand { margin-bottom: 12px; color: var(--white); }
.footer-main p { margin: 0; color: #97a69d; font-size: 14px; }
.footer-legal { display: flex; flex-direction: column; gap: 8px; align-items: flex-end; color: #aebbb4; font-size: 14px; }
.footer-bottom { padding: 18px 0 24px; border-top: 1px solid #2a3930; color: #809087; font-size: 12px; }

@media (max-width: 760px) {
  .shell { width: min(100% - 36px, 1160px); }
  .header-inner { min-height: 66px; }
  nav { display: none; }
  .brand { font-size: 16px; }
  .hero { min-height: 600px; }
  .hero-content { padding: 110px 0 70px; }
  h1 { font-size: 42px; }
  h2 { font-size: 32px; }
  .hero-copy { font-size: 16px; }
  .section { padding: 72px 0; }
  .split-heading, .product-layout, .security-layout { grid-template-columns: 1fr; gap: 28px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-item, .service-item:not(:first-child) { min-height: auto; padding: 28px 0; border-left: 0; }
  .service-index { margin-bottom: 34px; }
  .product-list article { grid-template-columns: 1fr; gap: 8px; }
  .product-aside { position: static; }
  .footer-main { flex-direction: column; padding: 42px 0 30px; }
  .footer-legal { align-items: flex-start; }
}