:root {
  --bg: #0b1220;
  --panel: #111827;
  --border: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header .brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

header nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.9rem;
}

header nav a:hover { color: var(--text); }

.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 6rem 2rem 4rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin: 0 0 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0 0 2.5rem;
}

.dropdown-wrap {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

select, .btn {
  font: inherit;
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  min-width: 12rem;
}

select:focus, .btn:focus { outline: 2px solid var(--accent); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
  text-decoration: none;
  display: inline-block;
}

.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.product {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.product h1 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
}

.product .subtitle {
  color: var(--muted);
  margin: 0 0 2.5rem;
  font-size: 1.05rem;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin: 0 0 1.25rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
}

.card .version {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0 0 1rem;
  font-family: ui-monospace, monospace;
}

.card .desc {
  color: var(--muted);
  margin: 0 0 1.25rem;
}

.placeholder {
  color: var(--muted);
  font-style: italic;
  font-size: 0.875rem;
}

footer {
  text-align: center;
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 4rem;
}