:root {
  --primary: #0066E0;
  --premium: #D70039;
  --text: #111418;
  --text-secondary: #545458;
  --bg: #F4F6FC;
  --card: #FFFFFF;
  --border: #E3E7F2;
  --radius: 18px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #4D9BFF;
    --premium: #FF4D73;
    --text: #F2F4F8;
    --text-secondary: #A9AEB8;
    --bg: #0E1117;
    --card: #171B23;
    --border: #262C38;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--primary); }
header.site {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid var(--border);
}
.nav {
  max-width: 960px; margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; flex-wrap: wrap; }
.nav a.link { display: block; padding: 6px 12px; border-radius: 999px; color: var(--text-secondary); text-decoration: none; font-weight: 500; font-size: 15px; }
.nav a.link:hover, .nav a.link[aria-current="page"] { background: var(--card); color: var(--primary); }
main { max-width: 960px; margin: 0 auto; padding: 32px 16px 48px; }
.hero { text-align: center; padding: 32px 0 24px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 12px 30px rgba(0, 102, 224, 0.2); }
.hero h1 { font-size: clamp(32px, 6vw, 48px); line-height: 1.1; margin: 20px 0 8px; letter-spacing: -0.02em; }
.hero p { font-size: 19px; color: var(--text-secondary); max-width: 560px; margin: 0 auto 24px; }
.button {
  display: inline-block; background: var(--primary); color: #fff; text-decoration: none;
  padding: 14px 26px; border-radius: 14px; font-weight: 600;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 32px 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 8px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--text-secondary); font-size: 15px; }
.emoji { font-size: 28px; }
.pricing { text-align: center; }
.pricing .price { font-size: 28px; font-weight: 700; margin: 4px 0; }
.badge { display: inline-block; background: var(--premium); color: #fff; font-size: 12px; font-weight: 700; padding: 2px 10px; border-radius: 999px; }
.doc { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(20px, 4vw, 40px); }
.doc h1 { margin-top: 0; font-size: clamp(28px, 5vw, 38px); line-height: 1.15; }
.doc h2 { margin-top: 32px; font-size: 21px; }
.doc .meta { color: var(--text-secondary); margin-top: -8px; }
.callout { background: color-mix(in srgb, var(--primary) 10%, var(--card)); border: 1px solid color-mix(in srgb, var(--primary) 35%, var(--border)); border-radius: 14px; padding: 16px 18px; margin: 20px 0; }
details { border-top: 1px solid var(--border); padding: 14px 0; }
details:last-of-type { border-bottom: 1px solid var(--border); }
summary { cursor: pointer; font-weight: 600; }
details p { color: var(--text-secondary); margin: 10px 0 0; }
footer.site { border-top: 1px solid var(--border); color: var(--text-secondary); font-size: 14px; }
footer.site .inner { max-width: 960px; margin: 0 auto; padding: 24px 16px 40px; display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }
footer.site a { color: var(--text-secondary); margin-right: 16px; }