:root {
  --bg: #031422;
  --panel: #0b1420;
  --surface: #0f1b2b;
  --border: rgba(255, 255, 255, 0.08);
  --text: #f5f6fb;
  --muted: #9fb3c6;
  --accent: #4f8bff;
  --accent-strong: #3ea5ff;
  --success: #4ade80;
  --warn: #fbbf24;
  font-family: "Inter", "SF Pro Display", -apple-system, system-ui, sans-serif;
}
*, *::before, *::after {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--family, "Inter", "SF Pro Display", -apple-system, system-ui, sans-serif);
}
header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 40px;
  background: rgba(9, 15, 25, 0.8);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
header.site-header img {
  height: 70px;
  width: auto;
}
nav a {
  margin-left: 24px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
main.content {
  padding: 40px clamp(20px, 4vw, 60px) 80px;
  max-width: 1100px;
  margin: 0 auto;
}
.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  padding: 32px;
  background: var(--surface);
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 25px 55px rgba(3, 6, 12, 0.65);
  margin-bottom: 32px;
}
.hero strong {
  color: var(--accent);
}
.hero-card img {
  width: 100%;
  border-radius: 20px;
  border: 1px solid var(--border);
}
.card {
  background: var(--panel);
  border-radius: 22px;
  padding: 28px;
  border: 1px solid var(--border);
  margin-bottom: 28px;
  box-shadow: 0 20px 35px rgba(2, 4, 10, 0.65);
}
.card h2,
.card h3 {
  margin-top: 0;
}
.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.grid ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
.grid li a {
  color: var(--accent);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 14px;
  border: none;
  background: var(--accent);
  color: #031422;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.btn.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.store-badge {
  display: inline-flex;
  margin-top: 16px;
}
.store-badge img {
  width: 246px;
  height: 82px;
  object-fit: contain;
  vertical-align: middle;
}
.store-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 12px;
}
.store-row.center {
  justify-content: center;
}
.store-center {
  text-align: center;
}
.qr-badge {
  width: 82px;
  height: 82px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #0c1522;
  padding: 6px;
  object-fit: contain;
}
footer.site-footer {
  padding: 30px 40px;
  text-align: center;
  border-top: 1px solid var(--border);
  background: rgba(3, 7, 14, 0.8);
  color: var(--muted);
}
footer.site-footer a {
  color: var(--accent);
}
.muted {
  color: var(--muted);
  font-size: 0.95rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}
code {
  background: #0a0f18;
  padding: 2px 6px;
  border-radius: 6px;
  color: var(--text);
}
.explain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.layout-stack {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
@media (max-width: 600px) {
  header.site-header {
    flex-direction: column;
    align-items: flex-start;
  }
  nav {
    margin-top: 12px;
  }
}

.result { font-weight: 700; margin-top: 12px; }