:root {
  --paper: #f4f6fb;
  --paper-deep: #e8edf5;
  --ink: #132235;
  --muted: #5d6c80;
  --accent: #0f6fff;
  --accent-strong: #0a4eb3;
  --line: rgba(19, 34, 53, .12);
  --panel: rgba(255, 255, 255, .72);
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(60rem 34rem at 85% -10%, rgba(15, 111, 255, .12), transparent 55%),
    linear-gradient(180deg, var(--paper), var(--paper-deep));
  font-family: "Avenir Next", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  line-height: 1.75;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1100px, calc(100% - 40px)); margin-inline: auto; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 26px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: .02em;
}
.brand:hover { text-decoration: none; }
.brand img { border-radius: 14px; box-shadow: 0 10px 30px rgba(15, 111, 255, .14); }
nav { display: flex; gap: 20px; flex-wrap: wrap; }
nav a { color: var(--muted); font-size: 14px; font-weight: 700; }
nav a.active, nav a:hover { color: var(--accent-strong); }

.hero {
  padding-block: 88px 76px;
  max-width: 900px;
}
.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
}
h1, h2 { line-height: 1.14; }
h1 {
  margin: 14px 0 22px;
  font-size: clamp(42px, 8vw, 66px);
  letter-spacing: -.05em;
}
.lead {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 2.2vw, 21px);
}
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 34px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
}
.button:hover { text-decoration: none; transform: translateY(-1px); }
.button.primary { color: white; background: var(--accent); box-shadow: 0 12px 28px rgba(15, 111, 255, .24); }
.button.secondary { color: var(--accent-strong); border: 1px solid var(--line); background: rgba(255, 255, 255, .55); }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  padding-bottom: 96px;
}
.feature {
  min-height: 220px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(14px);
}
.feature-wide { grid-column: span 2; }
.feature .index {
  color: var(--accent);
  font: 800 13px/1 "Avenir Next", sans-serif;
  letter-spacing: .15em;
}
.feature h2 {
  margin: 28px 0 10px;
  font-size: clamp(24px, 3.4vw, 38px);
}
.feature p { margin: 0; color: var(--muted); }

.legal {
  max-width: 840px;
  padding-block: 72px 100px;
}
.updated { color: var(--muted); font-size: 14px; }
.legal section {
  padding-block: 22px;
  border-top: 1px solid var(--line);
}
.legal h2 {
  margin: 0 0 10px;
  font-size: 26px;
}
.legal p { color: var(--muted); }
.support-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin: 38px 0;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
}
.support-card span { display: block; color: var(--muted); font-size: 13px; }
.support-card strong { display: block; margin-top: 4px; font-size: clamp(16px, 2.2vw, 22px); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-block: 28px 48px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.site-footer div { display: flex; gap: 18px; flex-wrap: wrap; }

@media (max-width: 680px) {
  .site-header { align-items: flex-start; }
  nav { gap: 14px; padding-top: 10px; }
  .brand span { display: none; }
  .hero { padding-block: 64px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-wide { grid-column: auto; }
  .support-card { flex-direction: column; align-items: stretch; }
  .site-footer { flex-direction: column; }
}