:root {
  --primary: #007AFF;
  --secondary: #5856D6;
  --text: #1C1C1E;
  --muted: #6D6D70;
  --line: #E5E5EA;
  --bg: #FFFFFF;
  --bg-soft: #FAFAFA;
  --radius: 16px;
  --maxw: 960px;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--text); }
.brand:hover { text-decoration: none; }
.logo-mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 16px;
}
.nav a { color: var(--muted); font-weight: 600; font-size: 15px; margin-left: 22px; }
.nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  text-align: center;
  padding: 96px 0 72px;
  background:
    radial-gradient(1200px 400px at 50% -80px, rgba(88,86,214,0.12), transparent),
    radial-gradient(900px 360px at 50% 0, rgba(0,122,255,0.10), transparent);
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 18px;
}
.hero .grad {
  background: linear-gradient(120deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { font-size: clamp(17px, 2.4vw, 21px); color: var(--muted); max-width: 620px; margin: 0 auto 32px; }

.cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 26px; border-radius: 999px; font-weight: 700; font-size: 16px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #0062cc; text-decoration: none; }
.btn-ghost { background: var(--bg-soft); color: var(--text); border: 1px solid var(--line); }
.btn-ghost:hover { background: #f0f0f3; text-decoration: none; }

/* Features */
.features { padding: 72px 0; }
.section-title { text-align: center; font-size: clamp(26px, 4vw, 36px); letter-spacing: -0.02em; margin: 0 0 12px; }
.section-sub { text-align: center; color: var(--muted); max-width: 560px; margin: 0 auto 48px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 22px; }
.card {
  background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px;
}
.card .ico {
  width: 44px; height: 44px; border-radius: 12px; margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(0,122,255,0.15), rgba(88,86,214,0.15));
  display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

/* Legal / doc pages */
.doc { padding: 56px 0 80px; }
.doc h1 { font-size: clamp(30px, 5vw, 42px); letter-spacing: -0.02em; margin: 0 0 6px; }
.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 40px; }
.doc h2 { font-size: 22px; margin: 40px 0 12px; letter-spacing: -0.01em; }
.doc p, .doc li { color: #2b2b2e; font-size: 16px; }
.doc ul { padding-left: 22px; }
.doc .lead { font-size: 18px; color: var(--muted); }
.callout {
  background: var(--bg-soft); border: 1px solid var(--line);
  border-left: 4px solid var(--primary);
  border-radius: 12px; padding: 16px 20px; margin: 24px 0;
}

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 40px 0; color: var(--muted); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.site-footer nav a { color: var(--muted); margin-right: 18px; }
.site-footer nav a:hover { color: var(--text); }

@media (max-width: 600px) {
  .nav a { margin-left: 14px; font-size: 14px; }
  .hero { padding: 64px 0 48px; }
}