:root {
  --main: #1c4e86;
  --main-deep: #143860;
  --side: #5a5f66;
  --side-deep: #3e4349;
  --paper: #eef3f8;
  --side-paper: #ececee;
  --ink: #13202c;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  line-height: 1.75;
  font-size: 17px;
  background: #d8dde3;
}

a { color: inherit; }
.page-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}
.col-main { background: var(--main); color: var(--paper); }
.col-side { background: var(--side); color: var(--side-paper); }
.inner { padding: 28px 32px; }

.mast-split { display: contents; }
.brand-block { display: flex; align-items: center; gap: 10px; padding: 18px 32px 8px; }
.col-main .brand-block { background: var(--main-deep); }
.col-side .brand-block { background: var(--side-deep); }
.brand { font-size: 14px; letter-spacing: 0.08em; }

.monitor {
  margin: 16px 32px 8px;
  border: 10px solid #1a1d20;
  border-radius: 8px;
  box-shadow: 0 8px 0 #0e1012;
  background: #0e1012;
}
.monitor-screen { padding: 16px 16px 20px; min-height: 120px; }
.col-main .monitor-screen { background: #2a6aad; }
.col-side .monitor-screen { background: #6e737a; }
.monitor-chin {
  height: 14px;
  background: #1a1d20;
  display: flex;
  justify-content: center;
  align-items: center;
}
.monitor-chin i {
  width: 36px;
  height: 4px;
  background: #3a3e44;
  display: block;
}

h1 {
  font-size: clamp(24px, 2.4vw, 32px);
  line-height: 1.35;
  margin: 18px 32px 12px;
  grid-column: 1 / -1;
}
.hero-copy { padding: 0 32px 24px; }
.hero-copy p { margin-bottom: 12px; }

.full {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.section-main, .section-side { padding: 28px 32px; }
.section-main { background: var(--main-deep); color: var(--paper); }
.section-side { background: var(--side-deep); color: var(--side-paper); }
h2 { font-size: clamp(20px, 2vw, 24px); line-height: 1.4; margin-bottom: 12px; }
.lead { margin-bottom: 12px; }

.cards { display: grid; gap: 12px; margin-top: 12px; }
.card { border: 1px solid rgba(255,255,255,0.22); padding: 14px; background: rgba(0,0,0,0.12); }
.card h3 { font-size: 16px; margin-bottom: 8px; }
.card p { font-size: 14.5px; margin-bottom: 8px; opacity: 0.92; }

.steps { display: grid; gap: 10px; margin-top: 12px; }
.step { display: grid; grid-template-columns: 36px 1fr; gap: 10px; border: 1px solid rgba(255,255,255,0.2); padding: 12px; }
.step b { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid currentColor; }
.step h3 { font-size: 16px; margin-bottom: 4px; }
.step p { font-size: 14.5px; opacity: 0.92; }

.table-wrap { overflow-x: auto; margin-top: 12px; grid-column: 1 / -1; padding: 0 32px 28px; background: #2e3338; color: #e8eaec; }
table { width: 100%; border-collapse: collapse; }
th, td { border: 1px solid #6a7076; padding: 10px 12px; text-align: left; font-size: 14.5px; vertical-align: top; }
th { background: #1c4e86; color: #eef3f8; }

.faq-wrap { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; }
.faq { padding: 24px 32px 28px; display: grid; gap: 10px; }
.faq details { border: 1px solid rgba(255,255,255,0.2); padding: 10px 12px; background: rgba(0,0,0,0.12); }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin-top: 8px; font-size: 14.5px; opacity: 0.92; }

.site-footer {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  font-size: 14px;
}
.site-footer .foot-main { background: #0f2a48; color: #c5d6e8; padding: 28px 32px; }
.site-footer .foot-side { background: #2a2e32; color: #c8cacd; padding: 28px 32px; }
.site-footer h2 { font-size: 17px; }
.legal { margin-top: 12px; padding-top: 10px; border-top: 1px solid rgba(255,255,255,0.15); }

@media (max-width: 860px) {
  .page-split, .full, .faq-wrap, .site-footer { grid-template-columns: 1fr; }
  h1 { margin: 18px 20px 12px; }
  .inner, .hero-copy, .section-main, .section-side, .brand-block, .faq, .table-wrap,
  .site-footer .foot-main, .site-footer .foot-side { padding-left: 20px; padding-right: 20px; }
  .monitor { margin-left: 20px; margin-right: 20px; }
}

.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 12px 24px;
  background: #101418;
  color: #eef3f8;
}
.topbar .brand-line { display: flex; align-items: center; gap: 10px; font-size: 14px; letter-spacing: 0.08em; }
.topbar nav { display: flex; flex-wrap: wrap; gap: 10px 16px; font-size: 13px; }
.topbar a { color: #d7e4f0; text-decoration: none; }
.topbar a:hover { text-decoration: underline; }