:root {
  --ink: #17202a;
  --muted: #5d6975;
  --paper: #ffffff;
  --surface: #f5f7f9;
  --line: #dce2e7;
  --blue: #0877d1;
  --orange: #f36b16;
  --green: #16865a;
  --yellow: #f7bd1f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.skip-link { position: absolute; left: -9999px; top: 8px; }
.skip-link:focus { left: 8px; z-index: 30; padding: 8px 12px; background: #fff; }
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); }
.nav { min-height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; }
.brand img { width: 38px; height: 38px; object-fit: contain; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px 22px; color: var(--muted); font-size: 14px; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--blue); }
.hero { border-bottom: 1px solid var(--line); }
.hero-grid { min-height: 540px; display: grid; align-items: center; grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr); gap: 64px; padding: 70px 0; }
.eyebrow { margin: 0 0 18px; color: var(--orange); font-size: 14px; font-weight: 800; }
h1, h2, h3 { margin-top: 0; line-height: 1.25; letter-spacing: 0; }
h1 { max-width: 760px; margin-bottom: 24px; font-size: 52px; }
.lead { max-width: 760px; margin: 0; color: #43505c; font-size: 19px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 18px; border: 1px solid var(--line); border-radius: 6px; font-weight: 800; }
.button-primary { border-color: var(--blue); background: var(--blue); color: #fff; }
.button-secondary:hover, .button-secondary:focus-visible { border-color: var(--orange); color: var(--orange); }
.hero-visual { display: flex; min-height: 330px; align-items: center; justify-content: center; padding: 36px; border-left: 4px solid var(--yellow); background: var(--surface); }
.hero-visual img { width: 100%; height: auto; }
.section { padding: 76px 0; border-bottom: 1px solid var(--line); }
.section-alt { background: var(--surface); }
.section-head { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr); gap: 56px; margin-bottom: 38px; }
.section-head h2 { margin-bottom: 0; font-size: 34px; }
.section-head p { margin: 0; color: var(--muted); font-size: 17px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.feature { min-height: 220px; padding: 26px; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.feature span { color: var(--blue); font-size: 13px; font-weight: 800; }
.feature h2, .feature h3 { margin: 42px 0 10px; font-size: 22px; }
.feature p { margin: 0; color: var(--muted); }
.flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; padding: 0; background: var(--line); }
.flow li { min-height: 170px; padding: 24px; background: #fff; list-style: none; }
.flow strong { display: block; margin-bottom: 14px; color: var(--green); }
.flow p { margin: 0; color: var(--muted); }
.faq { display: grid; gap: 0; }
.faq article { padding: 24px 0; border-bottom: 1px solid var(--line); }
.faq h3 { margin-bottom: 8px; font-size: 19px; }
.faq p { margin: 0; color: var(--muted); }
.related { display: flex; flex-wrap: wrap; gap: 10px 20px; color: var(--blue); font-weight: 800; }
.contact { padding: 58px 0; background: #17202a; color: #fff; }
.contact-grid { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.contact h2 { margin-bottom: 10px; font-size: 32px; }
.contact p { max-width: 680px; margin: 0; color: rgba(255,255,255,.72); }
.contact .button { border-color: rgba(255,255,255,.45); flex: 0 0 auto; }
footer { padding: 28px 0; color: var(--muted); font-size: 13px; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; }
.records { display: flex; flex-wrap: wrap; gap: 10px 18px; }

@media (max-width: 820px) {
  .hero-grid { min-height: auto; grid-template-columns: 1fr; gap: 36px; padding: 54px 0; }
  .hero-visual { min-height: 220px; }
  h1 { font-size: 38px; }
  .section-head, .feature-grid { grid-template-columns: 1fr; gap: 20px; }
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 28px, 1120px); }
  .nav { align-items: flex-start; flex-direction: column; gap: 8px; padding: 12px 0; }
  .nav-links { justify-content: flex-start; gap: 7px 12px; }
  h1 { font-size: 34px; }
  .lead { font-size: 17px; }
  .hero-visual { padding: 24px; }
  .section { padding: 56px 0; }
  .section-head h2 { font-size: 29px; }
  .flow { grid-template-columns: 1fr; }
  .contact-grid { align-items: flex-start; flex-direction: column; }
}