:root {
  --ink: #14213d;
  --muted: #667085;
  --blue: #1769d2;
  --blue-dark: #0d4f9e;
  --wash: #eff6ff;
  --line: #dfe7f2;
  --paper: #ffffff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 2%, rgba(23,105,210,.13), transparent 28rem),
    linear-gradient(180deg, #f8fbff 0, #fff 35rem);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
main { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(20,33,61,.09);
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 19px; font-weight: 750; }
.brand small { color: var(--muted); font-size: 12px; font-weight: 600; margin-left: 4px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  color: white; background: linear-gradient(145deg, #2181ed, #0c4d9b); box-shadow: 0 8px 24px rgba(23,105,210,.22);
}
nav { display: flex; gap: 28px; color: #475467; font-size: 14px; font-weight: 650; }
nav a:hover, footer a:hover { color: var(--blue); }

.hero { padding: 88px 0 56px; position: relative; }
.eyebrow { color: var(--blue); font-size: 14px; font-weight: 750; letter-spacing: .13em; }
h1 { margin: 16px 0 22px; max-width: 760px; font-size: clamp(44px, 7vw, 78px); line-height: 1.08; letter-spacing: -.055em; }
.hero-copy { max-width: 670px; color: var(--muted); font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; justify-content: center; padding: 12px 18px; border-radius: 13px; font-weight: 700; font-size: 14px; }
.button.primary { background: var(--blue); color: white; box-shadow: 0 12px 30px rgba(23,105,210,.22); }
.button.primary:hover { background: var(--blue-dark); }
.button.secondary { background: var(--paper); border: 1px solid var(--line); }

.hero-panel {
  margin-top: 58px; min-height: 220px; border-radius: 30px; padding: 50px;
  display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap;
  background: linear-gradient(130deg, #0e3768, #1769d2 62%, #50a2ff); color: white;
  box-shadow: 0 28px 70px rgba(17,70,134,.2); overflow: hidden;
}
.hero-panel p { flex-basis: 100%; text-align: center; margin: 18px 0 0; color: rgba(255,255,255,.82); }
.keycap { min-width: 70px; padding: 10px 18px 14px; border-radius: 15px; text-align: center; font-size: 28px; font-weight: 700; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.35); box-shadow: inset 0 -5px rgba(0,0,0,.14); }
.keycap.wide { min-width: 140px; }
.plus { color: rgba(255,255,255,.65); font-size: 22px; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding: 32px 0 100px; }
.feature-card { border: 1px solid var(--line); border-radius: 22px; padding: 28px; background: rgba(255,255,255,.78); }
.feature-number { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .16em; }
.feature-card h2 { margin: 18px 0 8px; font-size: 22px; }
.feature-card p { color: var(--muted); margin: 0; }

.page-shell { width: min(860px, calc(100% - 40px)); margin: 0 auto; }
.page-hero { padding: 74px 0 34px; }
.page-hero h1 { font-size: clamp(38px, 7vw, 64px); margin-bottom: 16px; }
.page-hero p { color: var(--muted); font-size: 17px; max-width: 680px; }
.content-card { background: rgba(255,255,255,.88); border: 1px solid var(--line); border-radius: 24px; padding: clamp(24px, 5vw, 46px); margin-bottom: 80px; box-shadow: 0 20px 60px rgba(24,62,110,.07); }
.content-card h2 { font-size: 24px; margin: 36px 0 10px; }
.content-card h2:first-child { margin-top: 0; }
.content-card h3 { font-size: 17px; margin: 25px 0 6px; }
.content-card p, .content-card li { color: #475467; }
.content-card ul { padding-left: 20px; }
.contact-box { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px; border-radius: 18px; background: var(--wash); margin: 24px 0; }
.contact-box strong { display: block; color: var(--ink); }
.contact-box span { color: var(--muted); font-size: 14px; }
.contact-box .button { flex: 0 0 auto; }
.back-link { color: var(--blue); font-weight: 700; }
.meta { color: #98a2b3 !important; font-size: 13px !important; }

footer { border-top: 1px solid var(--line); min-height: 96px; display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 13px; }
footer div { display: flex; gap: 20px; }

@media (max-width: 720px) {
  main, .page-shell { width: min(100% - 28px, 1120px); }
  .site-header { min-height: 70px; }
  nav { gap: 14px; font-size: 12px; }
  .brand small { display: none; }
  .hero { padding-top: 58px; }
  .hero-panel { padding: 40px 18px; gap: 10px; }
  .keycap { min-width: 58px; font-size: 22px; padding-inline: 12px; }
  .keycap.wide { min-width: 100px; }
  .feature-grid { grid-template-columns: 1fr; }
  .contact-box, footer { align-items: flex-start; flex-direction: column; }
  footer { padding: 24px 0; gap: 8px; }
}