:root {
  --bg: #0b1120;
  --surface: #111827;
  --border: #1f2937;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --success: #34d399;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

header {
  border-bottom: 1px solid var(--border);
  background: rgba(17, 24, 39, 0.8);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.9375rem;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
}

.hero {
  padding: 5rem 0 3rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.hero p {
  color: var(--muted);
  font-size: 1.125rem;
  max-width: 36rem;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  border: none;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #0b1120;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #0b1120;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--muted);
}

.features {
  padding: 3rem 0 5rem;
}

.features h2 {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 2rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.feature-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--muted);
  font-size: 0.875rem;
}

.download-section {
  padding: 3rem 0 5rem;
}

.download-section h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.download-section .subtitle {
  color: var(--muted);
  margin-bottom: 2.5rem;
}

.download-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
  flex-wrap: wrap;
}

.download-info h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.download-info p {
  color: var(--muted);
  font-size: 0.875rem;
}

.badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  margin-bottom: 0.5rem;
}

.note {
  margin-top: 2rem;
  padding: 1rem 1.25rem;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.note code {
  color: var(--accent);
  font-size: 0.8125rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  .nav-links {
    gap: 1rem;
  }

  .download-item {
    flex-direction: column;
    align-items: flex-start;
  }
}