:root {
  --ink: #17212b;
  --muted: #5f6d78;
  --paper: #f4f1e8;
  --panel: #fffdf7;
  --line: #d9d0bf;
  --primary: #075e68;
  --secondary: #244a73;
  --project: #a53f2b;
  --file: #2f6b4f;
  --accent: #e64a32;
  --amber: #d99a24;
  --shadow: rgba(23, 33, 43, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(23,33,43,.045) 1px, transparent 1px) 0 0 / 36px 36px,
    linear-gradient(rgba(23,33,43,.045) 1px, transparent 1px) 0 0 / 36px 36px,
    var(--paper);
  font-family: "Microsoft YaHei", "Noto Sans SC", "PingFang SC", sans-serif;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 68px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  background: rgba(244, 241, 232, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.brand { display: flex; align-items: center; gap: 10px; margin-right: auto; font-weight: 900; }
.brand-mark { display: grid; width: 34px; height: 34px; place-items: center; color: #fff; background: var(--primary); border: 2px solid var(--ink); }
nav { display: flex; gap: 24px; color: var(--muted); font-size: 14px; font-weight: 800; }
nav a:hover { color: var(--accent); }
.nav-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  color: #fff;
  background: var(--accent);
  border-radius: 7px;
  font-size: 14px;
  font-weight: 900;
  box-shadow: 0 12px 26px rgba(230, 74, 50, .22);
}

main { overflow: hidden; }
.hero-section {
  display: grid;
  grid-template-columns: minmax(360px, .9fr) minmax(500px, 1.1fr);
  align-items: center;
  gap: 58px;
  max-width: 1180px;
  min-height: calc(100vh - 68px);
  margin: 0 auto;
  padding: 66px 24px 72px;
}
.eyebrow { margin: 0 0 14px; color: var(--primary); font-size: 12px; font-weight: 900; }
.hero-copy h1 { margin: 0; font-size: clamp(62px, 6vw, 98px); line-height: 1.02; letter-spacing: 0; }
.hero-lead { max-width: 610px; margin: 24px 0 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.primary-button, .ghost-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 900;
}
.primary-button { color: #fff; background: var(--accent); box-shadow: 0 14px 30px rgba(230, 74, 50, .24); }
.ghost-button { color: var(--ink); background: rgba(255,255,255,.7); border: 1px solid var(--ink); }
.release-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.release-strip span { padding: 8px 10px; color: var(--muted); background: rgba(255,255,255,.74); border: 1px solid var(--line); border-radius: 6px; font-size: 12px; font-weight: 800; }

.product-panel {
  width: 100%;
  max-width: 560px;
  margin-left: auto;
  background: var(--panel);
  border: 2px solid var(--ink);
  border-radius: 10px;
  box-shadow: 18px 18px 0 var(--primary);
  overflow: hidden;
}
.panel-header { display: grid; grid-template-columns: 1fr auto; gap: 6px 18px; padding: 18px 20px; border-bottom: 1px solid var(--line); }
.panel-header span { color: var(--muted); font-size: 12px; font-weight: 800; }
.panel-header strong { grid-column: 1; font-size: 21px; line-height: 1.35; }
.panel-header em { grid-row: 1 / 3; grid-column: 2; align-self: center; color: var(--file); font-style: normal; font-size: 13px; font-weight: 900; }
.phone-preview { padding: 20px; }
.phone-top { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; color: var(--ink); font-weight: 900; }
.phone-top i { width: 38px; height: 10px; background: var(--ink); border-radius: 999px; }
.menu-card, .measurement-card {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 12px;
  padding: 16px;
  color: #fff;
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(23, 33, 43, .12);
}
.menu-card b { display: grid; width: 42px; height: 42px; place-items: center; background: rgba(255,255,255,.16); border-radius: 7px; }
.menu-card strong, .measurement-card strong { display: block; font-size: 18px; }
.menu-card small, .measurement-card small { display: block; margin-top: 6px; color: rgba(255,255,255,.76); line-height: 1.6; }
.menu-primary { background: var(--secondary); }
.measurement-card { display: block; border-left: 7px solid rgba(255,255,255,.55); }
.measurement-card span { display: block; margin-bottom: 7px; font-size: 12px; font-weight: 900; color: rgba(255,255,255,.72); }
.traction { background: #087f8c; }
.escalator { background: #2f6fb0; }
.export-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
.export-row div { min-height: 76px; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }
.export-row b { display: block; color: var(--project); font-size: 18px; }
.export-row span { display: block; margin-top: 8px; color: var(--muted); font-size: 12px; font-weight: 800; }

.stats-band { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--ink); color: #fff; }
.stats-band div { min-height: 112px; padding: 24px; border-right: 1px solid rgba(255,255,255,.14); }
.stats-band strong { display: block; margin-bottom: 8px; color: var(--amber); font-size: 24px; }
.stats-band span { color: rgba(255,255,255,.74); font-size: 13px; font-weight: 800; line-height: 1.7; }

.feature-section, .workflow-section, .download-section { max-width: 1180px; margin: 0 auto; padding: 88px 24px; }
.section-head { display: grid; grid-template-columns: .72fr 1.5fr; gap: 26px; align-items: end; margin-bottom: 32px; }
.section-head.compact { grid-template-columns: 1fr; max-width: 760px; }
.section-head h2 { margin: 0; font-size: clamp(32px, 4.3vw, 56px); line-height: 1.15; }
.workflow-section .section-head.compact {
  max-width: none;
}
.workflow-section .section-head h2 {
  white-space: nowrap;
  font-size: clamp(32px, 4.3vw, 56px);
}
.feature-section .section-head {
  grid-template-columns: 150px 1fr;
  gap: 18px;
}
.feature-section .section-head h2 {
  white-space: nowrap;
  font-size: clamp(32px, 4.3vw, 56px);
}
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature-grid article { min-height: 228px; padding: 22px; background: rgba(255,255,255,.78); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 12px 28px rgba(23,33,43,.06); }
.feature-grid article span { display: inline-flex; margin-bottom: 22px; color: var(--accent); font-size: 12px; font-weight: 900; }
.feature-grid h3 { margin: 0 0 12px; font-size: 20px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }

.workflow-section { max-width: none; padding-left: max(24px, calc((100vw - 1180px) / 2)); padding-right: max(24px, calc((100vw - 1180px) / 2)); background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.workflow-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 0; padding: 0; list-style: none; background: var(--line); }
.workflow-list li { display: grid; align-content: start; gap: 12px; min-height: 178px; padding: 24px; background: #fff; }
.workflow-list b { color: var(--primary); font-size: 32px; line-height: 1; }
.workflow-list strong { font-size: 18px; }
.workflow-list span { color: var(--muted); font-size: 13px; line-height: 1.8; }

.download-section { display: grid; grid-template-columns: 1.25fr .75fr; align-items: center; gap: 36px; }
.download-section h2 { margin: 0; font-size: clamp(32px, 4.3vw, 56px); line-height: 1.12; }
.download-section p:last-child { max-width: 700px; color: var(--muted); line-height: 1.85; }
.download-card { min-height: 174px; padding: 24px; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 14px 30px rgba(23,33,43,.10); }
.qr-card { display: grid; grid-template-columns: 180px 1fr; gap: 20px; align-items: center; }
.qr-frame { display: grid; place-items: center; width: 180px; height: 180px; padding: 12px; background: #fff; border: 2px solid var(--ink); border-radius: 8px; }
.qr-frame img { display: block; width: 100%; height: 100%; }
.qr-copy { display: grid; gap: 10px; align-content: center; }
.qr-copy span { color: var(--primary); font-size: 17px; font-weight: 900; }
.qr-copy strong { color: var(--accent); font-size: 42px; line-height: 1; }
.qr-copy em { color: var(--muted); font-size: 12px; font-style: normal; font-weight: 800; }

footer { display: flex; flex-wrap: wrap; gap: 22px; padding: 25px max(24px, calc((100vw - 1180px) / 2)); color: rgba(255,255,255,.66); background: var(--ink); font-size: 12px; }
footer strong { margin-right: auto; color: #fff; }

@media (max-width: 980px) {
  .site-header nav { display: none; }
  .hero-section { grid-template-columns: 1fr; min-height: auto; gap: 36px; padding-top: 48px; }
  .product-panel { margin: 0; max-width: none; }
  .stats-band, .feature-grid, .workflow-list { grid-template-columns: 1fr 1fr; }
  .section-head, .download-section { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .feature-section .section-head h2 { white-space: normal; }
  .workflow-section .section-head h2 { white-space: normal; }
  .site-header { min-height: 60px; gap: 12px; padding: 0 14px; }
  .brand { font-size: 15px; }
  .brand-mark { width: 30px; height: 30px; }
  .nav-download { min-height: 38px; padding: 0 11px; }
  .hero-section { padding: 36px 16px 46px; }
  .hero-copy h1 { font-size: 52px; }
  .hero-lead { font-size: 15px; }
  .hero-actions a { width: 100%; }
  .product-panel { box-shadow: 10px 10px 0 var(--primary); }
  .stats-band, .feature-grid, .workflow-list { grid-template-columns: 1fr; }
  .stats-band div { min-height: 88px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.14); }
  .feature-section, .workflow-section, .download-section { padding: 68px 16px; }
  .workflow-section { padding-left: 16px; padding-right: 16px; }
  .feature-grid article, .workflow-list li { min-height: auto; }
  .export-row { grid-template-columns: 1fr; }
  .qr-card { grid-template-columns: 1fr; }
  .qr-frame { width: min(240px, 100%); height: auto; aspect-ratio: 1; margin: 0 auto; }
  .qr-copy { text-align: center; }
  footer { padding-left: 16px; padding-right: 16px; }
  footer strong { width: 100%; }
}