:root {
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;
  --border: #e2e8f0;
  --brand: #3b82f6;
  --brand-2: #7c3aed;
  --brand-soft: #eff6ff;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}
.logo { display: inline-flex; }
.brand-name { letter-spacing: -0.01em; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.9rem;
}
.nav-links a {
  color: var(--text-muted);
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.2rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 150ms ease;
  border: 1px solid transparent;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(59, 130, 246, 0.35); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--bg-soft); }

/* hero */
.hero {
  padding: 6rem 0 5rem;
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-soft) 100%);
  text-align: center;
}
.hero .badge {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 auto 1.25rem;
  max-width: 820px;
  font-weight: 800;
}
.hero h1 em {
  font-style: italic;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 2rem;
}
.cta-row {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.subtle {
  font-size: 0.85rem;
  color: var(--text-subtle);
  margin-top: 1.5rem;
}

/* features */
.features {
  padding: 5rem 0;
}
.features h2,
.download h2,
.faq h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  text-align: center;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 150ms ease;
  box-shadow: var(--shadow-sm);
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}
.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}
.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* download */
.download {
  padding: 5rem 0;
  background: var(--bg-soft);
  text-align: center;
}
.download p { max-width: 600px; margin: 0 auto 2rem; color: var(--text-muted); }
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
}
.download-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem 1rem;
  color: var(--text);
  transition: all 150ms ease;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}
.download-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--brand);
  text-decoration: none;
}
.download-card strong { font-size: 1.1rem; }
.download-card span { color: var(--text-muted); font-size: 0.85rem; }

/* FAQ */
.faq { padding: 5rem 0; }
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  background: var(--bg-card);
  transition: all 150ms ease;
}
.faq details[open] {
  box-shadow: var(--shadow-sm);
  border-color: #cbd5e1;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  list-style: none;
  position: relative;
  padding-right: 2rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  color: var(--text-subtle);
  font-size: 1.3rem;
  font-weight: 300;
}
.faq details[open] summary::after { content: "−"; }
.faq details p {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* footer */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}
footer p { margin: 0.25rem 0; }

@media (max-width: 600px) {
  .nav-links a:not(.btn) { display: none; }
  .hero { padding: 4rem 0 3rem; }
  .features, .download, .faq { padding: 3rem 0; }
}