:root {
  --ink: #16283a;
  --deep: #17324f;
  --teal: #2d7c78;
  --teal-soft: #d8ece4;
  --apricot: #e9ad69;
  --coral: #cf6f57;
  --paper: #f7f3ea;
  --paper-2: #fffdf8;
  --line: #d8d5cc;
  --muted: #65727b;
  --shadow: 0 18px 50px rgba(23, 50, 79, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(247, 243, 234, .95);
  border-bottom: 1px solid rgba(216, 213, 204, .9);
  backdrop-filter: blur(14px);
}
.nav { min-height: 74px; 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: .06em; }
.brand img { width: 42px; height: 42px; border-radius: 13px; }
.brand span { font-size: 20px; }
.nav-links { display: flex; align-items: center; gap: 24px; font-size: 14px; color: #465764; }
.nav-links a { padding: 8px 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--coral); border-bottom-color: var(--coral); }
.nav-download { background: var(--deep); color: #fff; padding: 10px 18px; border-radius: 999px; font-weight: 700; }
.menu-toggle { display: none; border: 1px solid var(--line); background: var(--paper-2); color: var(--deep); border-radius: 10px; padding: 8px 10px; font-size: 18px; }

.hero { padding: 86px 0 70px; background: linear-gradient(110deg, #f7f3ea 0%, #edf1e9 58%, #e4eeeb 100%); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 74px; align-items: center; }
.eyebrow { color: var(--coral); text-transform: uppercase; letter-spacing: .16em; font-size: 12px; font-weight: 800; }
h1, h2, h3 { margin: 0; line-height: 1.2; letter-spacing: -.02em; }
h1 { font-size: clamp(38px, 6vw, 68px); max-width: 660px; margin: 14px 0 20px; }
.hero-copy { font-size: 18px; color: #4f5d63; max-width: 580px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 26px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 46px; padding: 0 20px; border-radius: 12px; border: 1px solid transparent; font-weight: 800; transition: transform .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(23, 50, 79, .14); }
.button-primary { background: var(--coral); color: #fff; }
.button-secondary { background: transparent; border-color: var(--deep); color: var(--deep); }
.trust-row { display: flex; flex-wrap: wrap; gap: 18px; color: var(--muted); font-size: 13px; }
.trust-row strong { color: var(--deep); font-size: 18px; display: block; }
.hero-art { position: relative; min-height: 500px; }
.hero-art::before { content: ""; position: absolute; inset: 8% 3% 4% 15%; border-radius: 42% 58% 55% 45%; background: #d8ece4; transform: rotate(-7deg); }
.phone-stack { position: relative; z-index: 1; display: flex; justify-content: center; align-items: flex-start; gap: 18px; padding-top: 10px; }
.phone { width: min(30vw, 210px); border: 8px solid var(--deep); border-radius: 28px; box-shadow: var(--shadow); background: #fff; overflow: hidden; }
.phone img { width: 100%; height: auto; }
.phone:nth-child(2) { margin-top: 80px; transform: rotate(4deg); }
.phone:nth-child(3) { margin-top: 28px; transform: rotate(-5deg); }
.tag { position: absolute; right: 3%; bottom: 5%; z-index: 2; background: var(--apricot); color: var(--deep); padding: 12px 16px; border-radius: 14px; font-weight: 800; box-shadow: 0 12px 26px rgba(23, 50, 79, .16); }

.section { padding: 76px 0; }
.section.alt { background: var(--paper-2); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 30px; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); }
.section-link { color: var(--coral); font-weight: 800; font-size: 14px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { border: 1px solid var(--line); background: var(--paper); padding: 24px; border-radius: 16px; min-height: 190px; }
.feature-card:nth-child(2) { background: #e7f1eb; }
.feature-card:nth-child(3) { background: #f8e9d7; }
.feature-icon { font-size: 27px; margin-bottom: 14px; }
.feature-card h3 { font-size: 20px; margin-bottom: 10px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 15px; }
.showcase { display: grid; grid-template-columns: .85fr 1.15fr; gap: 46px; align-items: center; }
.showcase-copy p { color: var(--muted); }
.check-list { list-style: none; padding: 0; margin: 22px 0 0; display: grid; gap: 11px; }
.check-list li { display: flex; gap: 10px; align-items: flex-start; }
.check-list li::before { content: "✓"; color: var(--coral); font-weight: 900; }
.showcase-images { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; align-items: end; }
.showcase-images img { width: min(100%, 230px); max-width: 400px; border: 6px solid var(--deep); border-radius: 20px; box-shadow: var(--shadow); }
.showcase-images img:nth-child(2) { margin-top: 52px; }
.showcase-images img:nth-child(3) { margin-top: 22px; }
.data-band { background: var(--deep); color: #f5f3ed; }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.data-item { padding: 10px 0; border-right: 1px solid rgba(255,255,255,.2); }
.data-item:last-child { border-right: 0; }
.data-item strong { display: block; font-size: 34px; color: var(--apricot); line-height: 1.1; }
.data-item span { color: #cad8dc; font-size: 13px; }
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.quote { margin: 0; padding: 23px; border-left: 4px solid var(--apricot); background: #fffaf1; border-radius: 0 14px 14px 0; }
.quote p { margin: 0 0 14px; font-size: 15px; }
.quote cite { color: var(--muted); font-size: 13px; font-style: normal; }
.home-faq { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
details { border-top: 1px solid var(--line); padding: 15px 0; }
summary { cursor: pointer; font-weight: 800; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::after { content: "+"; color: var(--coral); }
details[open] summary::after { content: "−"; }
details p { color: var(--muted); margin: 10px 0 0; }
.cta-band { padding: 52px 0; background: #e7f1eb; }
.cta-inner { display: flex; justify-content: space-between; align-items: center; gap: 26px; }
.cta-inner h2 { font-size: clamp(27px, 4vw, 40px); }
.cta-inner p { margin: 10px 0 0; color: var(--muted); }

.page-hero { padding: 64px 0 54px; background: var(--deep); color: #fff; }
.page-hero h1 { font-size: clamp(38px, 6vw, 62px); margin: 12px 0 14px; }
.page-hero p { max-width: 720px; color: #c8d8dc; font-size: 17px; margin: 0; }
.breadcrumbs { color: #b7ccc9; font-size: 13px; margin-bottom: 16px; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 46px; align-items: start; }
.article h2 { font-size: 28px; margin: 34px 0 12px; }
.article h3 { font-size: 19px; margin: 26px 0 6px; }
.article p { color: #4e5b61; margin: 12px 0; }
.article ul, .article ol { color: #4e5b61; padding-left: 22px; }
.article li { margin: 8px 0; }
.side-card { position: sticky; top: 100px; background: var(--paper-2); border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.side-card h2 { font-size: 21px; margin-bottom: 13px; }
.side-card a { display: block; padding: 10px 0; border-top: 1px solid var(--line); color: var(--teal); font-size: 14px; }
.step-list { display: grid; gap: 16px; margin: 22px 0; }
.step { display: grid; grid-template-columns: 44px 1fr; gap: 16px; align-items: start; padding: 18px; background: var(--paper-2); border: 1px solid var(--line); border-radius: 14px; }
.step-number { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: var(--coral); color: #fff; font-weight: 900; }
.step h3 { margin: 0 0 5px; font-size: 19px; }
.step p { margin: 0; }
.faq-list details { background: var(--paper-2); padding: 17px 18px; border: 1px solid var(--line); border-radius: 12px; margin: 11px 0; }
.faq-list summary { font-size: 16px; }
.notice { padding: 18px 20px; border-left: 4px solid var(--teal); background: #e7f1eb; color: #3f5656; border-radius: 0 12px 12px 0; margin: 22px 0; }

footer { background: #102538; color: #c5d0d2; padding: 40px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 30px; }
footer .brand span { color: #fff; }
footer h2 { color: #fff; font-size: 16px; margin-bottom: 10px; }
footer p, footer a { font-size: 13px; color: #b8c8ca; }
footer p { margin: 6px 0; }
.footer-links { display: grid; gap: 5px; }
.copyright { border-top: 1px solid rgba(255,255,255,.15); margin-top: 28px; padding-top: 18px; font-size: 12px; color: #8fa3a7; }

@media (max-width: 840px) {
  .shell { width: min(100% - 28px, 680px); }
  .menu-toggle { display: block; }
  .nav-links { display: none; position: absolute; left: 14px; right: 14px; top: 70px; padding: 12px 16px; background: var(--paper-2); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); flex-direction: column; align-items: stretch; gap: 4px; }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 10px 4px; }
  .nav-download { text-align: center; margin-top: 3px; }
  .hero { padding-top: 54px; }
  .hero-grid, .showcase, .content-layout { grid-template-columns: 1fr; gap: 34px; }
  .hero-art { min-height: 390px; }
  .phone { width: min(28vw, 190px); }
  .feature-grid, .quote-grid { grid-template-columns: 1fr; }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .data-item:nth-child(2) { border-right: 0; }
  .home-faq { grid-template-columns: 1fr; }
  .cta-inner { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .side-card { position: static; }
}
@media (max-width: 520px) {
  .nav { min-height: 66px; }
  .brand img { width: 36px; height: 36px; }
  .brand span { font-size: 18px; }
  h1 { font-size: 41px; }
  .hero-copy { font-size: 16px; }
  .phone-stack { gap: 8px; }
  .phone { width: 30vw; border-width: 5px; border-radius: 18px; }
  .hero-art { min-height: 300px; }
  .showcase-images { gap: 7px; }
  .showcase-images img { border-width: 4px; border-radius: 13px; }
  .section { padding: 56px 0; }
  .page-hero { padding: 48px 0 42px; }
}