:root {
  color-scheme: light;
  --bg: #f7faf6;
  --paper: #ffffff;
  --ink: #1f2a24;
  --muted: #647069;
  --line: #dde7de;
  --green: #23943d;
  --green-dark: #176c2c;
  --coral: #e86b5c;
  --amber: #f0b33e;
  --shadow: 0 18px 54px rgba(38, 75, 50, 0.1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.site-shell { min-height: 100vh; overflow-x: hidden; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(221, 231, 222, 0.86);
  background: rgba(247, 250, 246, 0.94);
  backdrop-filter: blur(14px);
}
.topbar-inner,
.section-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}
.topbar-inner {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand-logo,
.hero-app-icon {
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(35, 148, 61, 0.18);
}
.brand-logo { width: 38px; height: 38px; }
.brand-text { min-width: 0; }
.brand-name {
  display: block;
  font-size: 18px;
  font-weight: 800;
  line-height: 1.1;
}
.brand-company {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}
.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #47564d;
  font-size: 14px;
}
.nav a:hover { color: var(--green-dark); }
.hero {
  min-height: 82svh;
  display: flex;
  align-items: center;
  padding: 64px 0 44px;
  border-bottom: 1px solid var(--line);
  background: #f7faf6;
}
.hero-content { text-align: center; }
.hero-app-icon {
  width: 74px;
  height: 74px;
  margin: 0 auto 18px;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 700;
}
.hero h1 {
  margin: 24px 0 0;
  font-size: clamp(46px, 8vw, 88px);
  line-height: 1;
  font-weight: 900;
}
.hero-lead {
  width: min(760px, 100%);
  margin: 22px auto 0;
  color: #3f4e45;
  font-size: clamp(18px, 2.3vw, 25px);
  line-height: 1.65;
}
.hero-actions {
  margin-top: 30px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
}
.button.primary {
  border-color: var(--green);
  background: var(--green);
  color: #ffffff;
  box-shadow: 0 12px 24px rgba(35, 148, 61, 0.2);
}
.product-preview {
  width: min(980px, 100%);
  margin: 46px auto 0;
  display: grid;
  grid-template-columns: 1fr minmax(260px, 360px) 1fr;
  align-items: end;
  gap: 18px;
}
.preview-note {
  min-height: 154px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  text-align: left;
  box-shadow: var(--shadow);
}
.preview-note strong {
  display: block;
  font-size: 17px;
  line-height: 1.35;
}
.preview-note span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.preview-note.left { transform: translateY(-34px); }
.preview-note.right { transform: translateY(-8px); }
.phone {
  position: relative;
  width: min(100%, 360px);
  aspect-ratio: 9 / 17.5;
  margin: 0 auto;
  padding: 14px;
  border-radius: 36px;
  background: #1e2823;
  box-shadow: 0 32px 70px rgba(24, 52, 33, 0.28);
}
.phone-screen {
  height: 100%;
  overflow: hidden;
  border-radius: 26px;
  background: #fbfdf9;
}
.phone-head {
  padding: 24px 20px 16px;
  background: #e8f5e9;
}
.phone-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #6b7a70;
  font-size: 12px;
}
.phone-title {
  margin-top: 18px;
  font-size: 24px;
  font-weight: 900;
}
.phone-subtitle {
  margin-top: 8px;
  color: #66756b;
  font-size: 13px;
  line-height: 1.55;
}
.wish-card {
  margin: 18px;
  padding: 16px;
  border: 1px solid #dfe8df;
  border-radius: 8px;
  background: #ffffff;
}
.wish-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.wish-thumb {
  width: 58px;
  height: 58px;
  border-radius: 8px;
  background: #f0b33e;
  box-shadow: inset -14px -14px 0 rgba(232, 107, 92, 0.72);
}
.wish-title { font-size: 15px; font-weight: 800; }
.wish-meta {
  margin-top: 7px;
  color: #6d7a70;
  font-size: 12px;
}
.mini-list {
  margin: 0 18px 18px;
  display: grid;
  gap: 10px;
}
.mini-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 50px;
  padding: 0 14px;
  border-radius: 8px;
  background: #ffffff;
  border: 1px solid #e5ece5;
  font-size: 13px;
  font-weight: 700;
}
.mini-item small {
  color: var(--green-dark);
  font-weight: 800;
}
.section {
  padding: 76px 0;
  background: #ffffff;
}
.section.alt { background: #f4f8f5; }
.section-heading {
  width: min(700px, 100%);
  margin-bottom: 30px;
}
.section-label {
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
}
.section h2,
.doc-page h1 {
  margin: 10px 0 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15;
}
.section-desc,
.doc-lead {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.feature-card,
.info-card,
.contact-card,
.doc-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}
.feature-card { padding: 22px; }
.feature-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #e8f5e9;
  color: var(--green-dark);
  font-size: 16px;
  font-weight: 900;
}
.feature-card h3,
.info-card h3,
.contact-card h3,
.doc-card h2 {
  margin: 18px 0 0;
  font-size: 19px;
}
.feature-card p,
.info-card p,
.contact-card p,
.doc-card p,
.doc-card li {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}
.info-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 18px;
}
.info-card,
.contact-card { padding: 24px; }
.fact-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}
.fact {
  display: grid;
  grid-template-columns: 116px 1fr;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid #edf2ed;
  color: #526058;
  font-size: 15px;
  line-height: 1.6;
}
.fact:last-child { border-bottom: 0; padding-bottom: 0; }
.fact b { color: var(--ink); }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  background: #ffffff;
  color: #66756b;
  font-size: 13px;
}
.footer-inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.doc-page {
  min-height: 100vh;
  background: #f7faf6;
}
.doc-hero {
  padding: 56px 0 34px;
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}
.doc-shell {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
}
.doc-meta {
  margin-top: 18px;
  color: #708078;
  font-size: 14px;
}
.doc-content { padding: 34px 0 70px; }
.doc-card {
  padding: 26px;
  margin-top: 14px;
}
.doc-card h2 { font-size: 23px; }
.doc-card ul {
  margin: 14px 0 0;
  padding-left: 22px;
}
.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 800;
}
@media (max-width: 900px) {
  .topbar-inner,
  .section-inner,
  .footer-inner,
  .doc-shell {
    width: min(100% - 28px, 720px);
  }
  .nav { display: none; }
  .hero {
    min-height: auto;
    padding: 44px 0 32px;
  }
  .product-preview { grid-template-columns: 1fr; }
  .preview-note.left,
  .preview-note.right { transform: none; }
  .preview-note { min-height: auto; }
  .phone {
    order: -1;
    width: min(100%, 310px);
  }
  .feature-grid,
  .contact-grid,
  .info-layout { grid-template-columns: 1fr; }
  .section { padding: 54px 0; }
  .fact { grid-template-columns: 92px 1fr; }
}
@media (max-width: 520px) {
  .topbar-inner { height: 62px; }
  .brand-company { display: none; }
  .hero-kicker { font-size: 13px; }
  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }
  .button { width: 100%; }
  .feature-card,
  .info-card,
  .contact-card,
  .doc-card { padding: 20px; }
  .fact {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}