:root {
  --ink: #182018;
  --pine: #314b3b;
  --pine-deep: #263d30;
  --sage: #b5c4a0;
  --paper: #f4f7f1;
  --white: #ffffff;
  --line: #dbe4d6;
  --muted: #667365;
  --accent: #d5e3c3;
  --shadow: 0 18px 48px rgba(33, 54, 39, .10);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.7;
  background-image: linear-gradient(rgba(49, 75, 59, .025) 1px, transparent 1px), linear-gradient(90deg, rgba(49, 75, 59, .025) 1px, transparent 1px);
  background-size: 24px 24px;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(244, 247, 241, .94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; letter-spacing: .02em; }
.brand img { width: 38px; height: 38px; }
.brand span { font-size: 1.16rem; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 18px; font-size: .92rem; color: var(--muted); }
.nav-links a { padding: 7px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--pine); border-color: var(--pine); }

.hero { padding: 72px 0 54px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 54px; align-items: center; }
.eyebrow { margin: 0 0 14px; text-transform: uppercase; letter-spacing: .18em; font-size: .74rem; color: var(--pine); font-weight: 800; }
h1, h2, h3 { font-family: Georgia, "Times New Roman", "Microsoft YaHei", serif; line-height: 1.18; margin: 0; color: var(--pine-deep); }
h1 { font-size: clamp(2.45rem, 5vw, 4.5rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.75rem, 3vw, 2.55rem); }
h3 { font-size: 1.2rem; }
.hero-copy { font-size: 1.07rem; color: var(--muted); max-width: 590px; margin: 24px 0 30px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 12px; padding: 12px 22px; font-weight: 800; border: 1px solid transparent; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.btn-primary { color: var(--white); background: var(--pine); box-shadow: 0 10px 22px rgba(49, 75, 59, .22); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(49, 75, 59, .28); }
.btn-ghost { color: var(--pine); border-color: var(--pine); background: transparent; }
.btn-ghost:hover { background: var(--accent); }
.hero-note { margin-top: 14px; font-size: .82rem; color: var(--muted); }
.hero-art { position: relative; min-height: 430px; display: grid; place-items: center; }
.hero-art::before { content: ""; position: absolute; width: 330px; height: 330px; border-radius: 50%; background: var(--accent); opacity: .56; }
.phone { position: relative; width: min(320px, 78vw); border: 8px solid #25372b; border-radius: 30px; background: #182018; box-shadow: var(--shadow); transform: rotate(3deg); }
.phone img { border-radius: 20px; width: 100%; }
.stamp { position: absolute; right: -18px; bottom: 28px; background: var(--white); border: 1px solid var(--line); padding: 12px 15px; border-radius: 10px; box-shadow: var(--shadow); font-size: .76rem; font-weight: 800; color: var(--pine); }

.section { padding: 76px 0; border-top: 1px solid var(--line); }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 28px; }
.section-tag { color: var(--pine); font-size: .76rem; letter-spacing: .14em; text-transform: uppercase; font-weight: 800; margin: 0 0 8px; }
.section-sub { max-width: 520px; color: var(--muted); margin: 0; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stat { background: var(--white); border: 1px solid var(--line); padding: 24px; border-radius: 12px; box-shadow: 0 8px 24px rgba(33, 54, 39, .05); }
.stat strong { display: block; font-size: 2.35rem; color: var(--pine); font-family: Georgia, serif; }
.stat span { color: var(--muted); font-size: .9rem; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.feature { background: var(--white); border: 1px solid var(--line); border-radius: 12px; padding: 22px; min-height: 190px; }
.feature-icon { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: var(--accent); color: var(--pine); font-weight: 900; margin-bottom: 16px; }
.feature p, .card p { color: var(--muted); font-size: .92rem; margin: 10px 0 0; }
.device-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.device { padding: 24px; border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(145deg, #fff, #f2f6ee); }
.device strong { display: block; color: var(--pine); margin-bottom: 5px; }
.promise { display: grid; grid-template-columns: 1fr 1.3fr; gap: 40px; align-items: start; }
.promise-list { display: grid; gap: 12px; }
.promise-item { display: flex; gap: 13px; padding: 17px 0; border-bottom: 1px dashed var(--line); }
.promise-item b { color: var(--pine); }
.promise-item span { color: var(--muted); font-size: .92rem; }
.link-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.link-card { display: flex; flex-direction: column; justify-content: space-between; gap: 18px; background: var(--pine); color: var(--white); border-radius: 12px; padding: 22px; min-height: 184px; }
.link-card small { color: #dbe8d4; text-transform: uppercase; letter-spacing: .1em; }
.link-card p { margin: 0; color: #edf3e9; font-size: .9rem; }
.link-card .arrow { font-size: 1.25rem; }

.page-hero { padding: 70px 0 42px; border-bottom: 1px solid var(--line); }
.page-hero .hero-copy { margin-bottom: 0; }
.article { padding: 52px 0 80px; }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 46px; align-items: start; }
.article-body { background: var(--white); border: 1px solid var(--line); border-radius: 12px; padding: clamp(24px, 5vw, 48px); }
.article-body h2 { font-size: 1.55rem; margin: 34px 0 12px; }
.article-body p { margin: 0 0 16px; color: #445246; }
.article-body ol, .article-body ul { margin: 0 0 18px; padding-left: 22px; color: #445246; }
.article-body li { margin: 8px 0; }
.aside { position: sticky; top: 98px; display: grid; gap: 14px; }
.aside-card { border: 1px solid var(--line); border-radius: 12px; background: #fbfdf9; padding: 18px; }
.aside-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.aside-card a { display: block; padding: 8px 0; color: var(--pine); border-bottom: 1px dashed var(--line); font-size: .9rem; }
.aside-card a:last-child { border-bottom: 0; }
.checklist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin: 18px 0 26px; }
.check { border: 1px solid var(--line); padding: 13px; border-radius: 9px; background: #fbfdf9; font-size: .9rem; }
.check b { display: block; color: var(--pine); margin-bottom: 3px; }
.site-footer { background: var(--pine-deep); color: #edf3e9; padding: 38px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 28px; }
.footer-brand { font-family: Georgia, serif; font-size: 1.55rem; margin-bottom: 10px; }
.footer-note, .footer-links a, .copyright { color: #cbd9c8; font-size: .86rem; }
.footer-links { display: grid; gap: 7px; }
.copyright { border-top: 1px solid rgba(219, 232, 212, .2); margin-top: 26px; padding-top: 18px; }

@media (max-width: 900px) {
  .hero-grid, .promise, .article-grid { grid-template-columns: 1fr; }
  .hero-art { min-height: 360px; }
  .aside { position: static; grid-template-columns: repeat(2, 1fr); }
  .feature-grid, .link-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .wrap { width: min(100% - 28px, 1120px); }
  .nav { align-items: flex-start; padding: 14px 0; flex-direction: column; gap: 10px; }
  .nav-links { justify-content: flex-start; gap: 13px; font-size: .84rem; }
  .hero { padding-top: 48px; }
  .stats, .device-grid, .feature-grid, .link-grid, .footer-grid, .aside, .checklist { grid-template-columns: 1fr; }
  .section-head { display: block; }
  .section-sub { margin-top: 12px; }
  h1 { font-size: 2.65rem; }
  .hero-art { min-height: 320px; }
  .phone { width: 250px; }
}