:root {
  color-scheme: light;
  --bg: #f5f8fc;
  --surface: #ffffff;
  --ink: #142039;
  --muted: #667895;
  --line: #dbe4ef;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --green: #10b981;
  --shadow: 0 24px 70px rgba(50, 79, 123, .14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
.page { min-height: 100vh; overflow: hidden; }
.hero { position: relative; isolation: isolate; padding: 24px clamp(20px, 5vw, 76px) 86px; background: linear-gradient(135deg, #f7fbff 0%, #eef5ff 55%, #f4fbf8 100%); }
.topbar, .hero-content, .details, .footer { position: relative; z-index: 1; max-width: 1160px; margin: auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 17px; font-weight: 800; letter-spacing: 0; }
.brand img { width: 38px; height: 38px; border-radius: 11px; object-fit: cover; box-shadow: 0 8px 20px rgba(37,99,235,.18); }
.status { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: 12px; }
.status i, .mini-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--green); }
.hero-content { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 90px; align-items: center; padding-top: 72px; }
.hero-copy { max-width: 590px; }
.eyebrow { margin: 0 0 12px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 18px; font-size: clamp(42px, 6vw, 76px); line-height: 1.05; letter-spacing: 0; }
.lead { max-width: 510px; margin-bottom: 30px; color: var(--muted); font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.download-button { display: inline-flex; align-items: center; gap: 12px; min-height: 58px; padding: 0 22px; color: #fff; background: var(--blue); border-radius: 12px; box-shadow: 0 12px 24px rgba(37,99,235,.23); transition: transform .2s, background .2s; }
.download-button:hover { background: var(--blue-dark); transform: translateY(-2px); }
.download-icon { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid rgba(255,255,255,.45); border-radius: 50%; font-size: 20px; line-height: 1; }
.download-button strong, .download-button small { display: block; text-align: left; }
.download-button strong { font-size: 15px; }
.download-button small { margin-top: 2px; color: #dbeafe; font-size: 11px; }
.copy-button { min-height: 58px; padding: 0 18px; color: var(--ink); background: rgba(255,255,255,.75); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; transition: background .2s, border-color .2s; }
.copy-button:hover { background: #fff; border-color: #b7c8df; }
.tip { margin: 14px 0 0; color: #8190a8; font-size: 12px; }
.phone-preview { width: min(100%, 340px); justify-self: center; padding: 12px; background: #172033; border: 5px solid #25334d; border-radius: 36px; box-shadow: var(--shadow); transform: rotate(2deg); }
.phone-speaker { width: 76px; height: 5px; margin: 2px auto 8px; background: #33445f; border-radius: 10px; }
.phone-screen { min-height: 570px; padding: 12px; overflow: hidden; background: #f4f5f7; border-radius: 25px; }
.mini-status { display: flex; justify-content: space-between; color: #64748b; font-size: 10px; }
.mini-header { display: flex; justify-content: space-between; align-items: center; padding: 18px 3px 20px; border-bottom: 1px solid #dce2ea; }
.mini-header b { font-size: 15px; }
.mini-header small { display: block; margin-top: 5px; color: var(--muted); font-size: 10px; }
.mini-dot { width: 7px; height: 7px; margin-left: 5px; }
.switch { color: #718096; font-size: 24px; }
.mini-card, .mini-info { margin-top: 16px; padding: 17px; background: #fff; border: 1px solid var(--line); border-radius: 17px; }
.mini-card h2 { margin-bottom: 7px; font-size: 20px; }
.mini-card p, .mini-info p { color: var(--muted); font-size: 10px; line-height: 1.7; }
.mini-auth { display: flex; gap: 10px; align-items: center; margin: 28px 0 23px; }
.mini-auth > span { color: var(--green); font-size: 28px; }
.mini-auth b, .mini-auth small { display: block; }
.mini-auth small { margin-top: 4px; color: var(--muted); font-size: 10px; }
.mini-card label { display: block; margin-bottom: 7px; color: var(--muted); font-size: 10px; }
.mini-button { padding: 12px; color: #fff; background: var(--blue); border-radius: 8px; text-align: center; font-size: 12px; }
.mini-info b { display: block; margin-bottom: 10px; font-size: 13px; }
.mini-info p { margin-bottom: 5px; }
.hero-orbit { position: absolute; z-index: -1; border: 1px solid rgba(37,99,235,.1); border-radius: 50%; pointer-events: none; }
.orbit-one { width: 540px; height: 540px; top: -220px; right: -180px; }
.orbit-two { width: 360px; height: 360px; bottom: -210px; left: -160px; border-color: rgba(16,185,129,.11); }
.details { padding: 88px 20px 74px; }
.section-heading { margin-bottom: 28px; }
.section-heading h2 { margin-bottom: 0; font-size: 32px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; box-shadow: 0 10px 30px rgba(50,79,123,.06); }
.step { min-height: 200px; padding: 26px; background: var(--surface); }
.step-number { color: var(--blue); font-size: 12px; font-weight: 800; }
.step h3 { margin: 24px 0 10px; font-size: 18px; }
.step p { margin-bottom: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.footer { display: flex; justify-content: space-between; padding: 22px 20px 30px; color: #8290a7; border-top: 1px solid var(--line); font-size: 12px; }
@media (max-width: 820px) {
  .hero-content { grid-template-columns: 1fr; gap: 44px; padding-top: 55px; }
  .hero-copy { max-width: 650px; }
  .phone-preview { transform: rotate(1deg); }
}
@media (max-width: 620px) {
  .hero { padding: 18px 16px 62px; }
  .topbar { align-items: flex-start; }
  .status { display: none; }
  h1 { font-size: 48px; }
  .lead { font-size: 15px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .download-button, .copy-button { width: 100%; justify-content: center; }
  .phone-preview { width: min(100%, 320px); }
  .details { padding: 56px 16px; }
  .steps { grid-template-columns: 1fr; }
  .step { min-height: auto; padding: 22px; }
  .step h3 { margin-top: 14px; }
  .footer { padding: 18px 16px 26px; }
}