:root {
  --bg: #ffffff;
  --surface: #f6f6f8;
  --border: #e6e6ea;
  --text: #16161a;
  --muted: #5b5b66;
  --crimson: #c8102e;
  --crimson-strong: #a00c24;
  --radius: 16px;
  --maxw: 720px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d10;
    --surface: #17171c;
    --border: #2a2a31;
    --text: #f2f2f5;
    --muted: #a2a2ad;
    --crimson: #ff4d63;
    --crimson-strong: #ff7184;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header nav */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  z-index: 10;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  font-size: 17px;
}
.brand img { width: 28px; height: 28px; border-radius: 7px; display: block; }
.nav-links { display: flex; gap: 22px; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
}
.nav-links a:hover, .nav-links a.active { color: var(--crimson); }

/* Hero */
.hero {
  text-align: center;
  padding: 72px 0 56px;
}
.hero .app-icon {
  width: 112px;
  height: 112px;
  border-radius: 25px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.18);
  display: block;
  margin: 0 auto 28px;
}
.hero h1 {
  font-size: 44px;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.hero .tagline {
  font-size: 20px;
  color: var(--muted);
  margin: 0 auto 32px;
  max-width: 540px;
}
.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.06s ease, background 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--crimson); color: #fff; }
.btn-primary:hover { background: var(--crimson-strong); }
.btn-secondary { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--crimson); color: var(--crimson); }

.note { color: var(--muted); font-size: 14px; margin-top: 18px; }

/* Content pages */
.page { padding: 56px 0 32px; }
.page h1 { font-size: 34px; letter-spacing: -0.02em; margin: 0 0 6px; }
.page .meta { color: var(--muted); font-size: 14px; margin: 0 0 36px; }
.page h2 { font-size: 21px; margin: 38px 0 10px; }
.page p { margin: 0 0 14px; }
.page a { color: var(--crimson); }
.page ul { padding-left: 20px; margin: 0 0 14px; }
.page li { margin-bottom: 8px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 0 0 18px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); }

.contact-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  margin: 8px 0 34px;
}
.contact-box a { font-size: 19px; font-weight: 600; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
.site-footer a { color: var(--muted); }
.site-footer .links { margin-bottom: 10px; }
.site-footer .links a { margin: 0 10px; text-decoration: none; }
.site-footer .links a:hover { color: var(--crimson); }

@media (max-width: 540px) {
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 34px; }
  .hero .tagline { font-size: 18px; }
  .nav-links { gap: 16px; }
}