:root {
  color-scheme: light;
  --ink: #171747;
  --muted: #6f7794;
  --line: #e6e7f6;
  --primary: #5867f5;
  --cyan: #27c3e8;
  --surface: #f5f6ff;
  --white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
.site-header { position: sticky; top: 0; z-index: 20; height: 68px; padding: 0 max(24px, calc((100vw - 1120px) / 2)); display: flex; align-items: center; justify-content: space-between; background: rgba(255,255,255,.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(16px); }
.brand { display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 750; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }
nav { display: flex; gap: 28px; color: #3f4563; font-size: 15px; }
nav a:hover, .footer-links a:hover { color: var(--primary); }

.hero { min-height: min(760px, calc(100vh - 68px)); position: relative; overflow: hidden; display: grid; align-items: center; }
.hero-media { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(26,23,93,.88), rgba(45,50,161,.65), rgba(27,37,92,.35)), url("brand-visual.jpg") center/cover no-repeat; }
.hero-content { position: relative; width: min(1120px, calc(100% - 48px)); margin: 0 auto; color: #fff; }
.hero-logo { width: 88px; height: 88px; border-radius: 23px; box-shadow: 0 18px 55px rgba(25,202,235,.25); }
.hero h1 { margin: 22px 0 0; font-size: clamp(48px, 8vw, 86px); line-height: 1.05; letter-spacing: 0; }
.tagline { margin: 12px 0 0; font-size: 25px; font-weight: 650; }
.intro { max-width: 620px; margin: 24px 0 0; color: rgba(255,255,255,.82); font-size: 18px; }
.download-row { display: flex; gap: 12px; margin-top: 34px; flex-wrap: wrap; }
.store-button { padding: 12px 20px; border: 1px solid rgba(255,255,255,.55); background: rgba(255,255,255,.12); border-radius: 6px; font-weight: 650; backdrop-filter: blur(12px); }

.section { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 92px 0; }
.section-heading { max-width: 720px; }
.eyebrow { margin: 0 0 10px; color: var(--primary); font-size: 14px; font-weight: 750; }
h2 { margin: 0; font-size: clamp(30px, 5vw, 46px); line-height: 1.25; letter-spacing: 0; }
.feature-grid { margin-top: 44px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-grid article { min-height: 220px; padding: 32px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-grid article > span { width: 44px; height: 44px; display: grid; place-items: center; color: #fff; background: var(--primary); border-radius: 50%; font-weight: 750; }
.feature-grid article:nth-child(2n) > span { background: #ff6475; }
.feature-grid article:nth-child(3n) > span { background: #19b88a; }
.feature-grid h3 { margin: 20px 0 8px; font-size: 21px; }
.feature-grid p { margin: 0; color: var(--muted); }

.about-grid { margin-top: 40px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 72px; align-items: start; }
.about-grid > div { color: var(--muted); font-size: 17px; }
.about-grid > div p:first-child { margin-top: 0; }
.company-facts { margin: 0; border-top: 1px solid var(--line); }
.company-facts div { padding: 17px 0; display: grid; grid-template-columns: 110px 1fr; gap: 18px; border-bottom: 1px solid var(--line); }
.company-facts dt { color: var(--muted); }
.company-facts dd { margin: 0; font-weight: 650; overflow-wrap: anywhere; }
.company-facts a { color: var(--primary); }

.section-band { padding: 80px max(24px, calc((100vw - 1120px) / 2)); display: grid; grid-template-columns: 1.35fr .65fr; gap: 80px; align-items: center; background: var(--surface); }
.section-band > div:first-child > p:last-child { color: var(--muted); max-width: 680px; }
.product-showcase { grid-template-columns: .75fr 1.25fr; }
.text-link { display: inline-block; margin-top: 18px; color: var(--primary); font-weight: 700; }
.phone-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-items: end; }
.phone-gallery figure { margin: 0; }
.phone-gallery img { display: block; width: 100%; aspect-ratio: 390 / 720; object-fit: cover; border: 1px solid #dfe1f3; border-radius: 8px; box-shadow: 0 18px 44px rgba(35,37,98,.12); }
.phone-gallery figcaption { margin-top: 10px; color: var(--muted); font-size: 13px; text-align: center; }
.safety-links { display: grid; border-top: 1px solid #dfe1f3; }
.safety-links a { padding: 18px 4px; border-bottom: 1px solid #dfe1f3; font-weight: 650; }
.safety-links a::after { content: "→"; float: right; color: var(--primary); }

.governance-grid { margin-top: 42px; display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.governance-grid article { padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.governance-grid h3 { margin: 0 0 10px; font-size: 20px; }
.governance-grid p { margin: 0; color: var(--muted); }
.faq { grid-template-columns: .8fr 1.2fr; }
.faq-list { border-top: 1px solid #dfe1f3; }
.faq-list details { padding: 18px 0; border-bottom: 1px solid #dfe1f3; }
.faq-list summary { cursor: pointer; font-weight: 700; }
.faq-list details p { margin: 10px 0 0; color: var(--muted); }

.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.contact > div:first-child p:last-child { color: var(--muted); }
.contact-list { display: grid; border-top: 1px solid var(--line); }
.contact-list a { display: flex; justify-content: space-between; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.contact-list span { color: var(--muted); overflow-wrap: anywhere; }

footer { padding: 44px max(24px, calc((100vw - 1120px) / 2)); color: #8188a3; background: #15162f; font-size: 13px; }
footer > div:first-child { display: flex; gap: 14px; align-items: center; color: #fff; }
footer > div:first-child span { color: #9fa5c1; }
.footer-links { display: flex; gap: 20px; margin-top: 24px; flex-wrap: wrap; color: #d7d9e7; }
footer p { margin: 18px 0 0; }
.filing { color: #737a99; }

@media (max-width: 760px) {
  .site-header { height: 60px; padding-inline: 18px; }
  .site-header nav { display: none; }
  .hero { min-height: 670px; }
  .hero-content, .section { width: calc(100% - 36px); }
  .hero-logo { width: 76px; height: 76px; }
  .hero h1 { font-size: 56px; }
  .tagline { font-size: 21px; }
  .intro { font-size: 16px; }
  .section { padding: 64px 0; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid article { min-height: 190px; padding: 24px 20px; }
  .section-band, .contact { grid-template-columns: 1fr; gap: 36px; }
  .about-grid { grid-template-columns: 1fr; gap: 34px; }
  .section-band { padding: 64px 18px; }
  .phone-gallery { gap: 8px; }
  .phone-gallery figcaption { font-size: 11px; }
  .governance-grid { grid-template-columns: 1fr; }
  .contact-list a { display: block; }
  .contact-list span { display: block; margin-top: 4px; }
}

@media (max-width: 420px) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; }
  .company-facts div { grid-template-columns: 1fr; gap: 3px; }
}