:root {
  --bg: #0f1117;
  --bg-card: #181a24;
  --bg-card-hover: #1e2130;
  --text: #e4e6ed;
  --text-muted: #8b8fa3;
  --accent: #6c63ff;
  --accent-hover: #7f78ff;
  --border: #2a2d3a;
  --max-width: 720px;
  --radius: 8px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

/* ---- Navigation ---- */

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

nav .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

nav .logo:hover {
  text-decoration: none;
  color: var(--accent);
}

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

nav .nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
}

nav .nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

/* ---- Main content ---- */

main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

/* ---- Hero (landing page) ---- */

.hero {
  text-align: center;
  padding: 6rem 0 4rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto 2.5rem;
}

/* ---- Feature cards ---- */

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 3rem 0;
}

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

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

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---- Coming soon ---- */

.coming-soon {
  text-align: center;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 3rem 0;
}

.web-app-link {
  text-align: center;
  font-size: 1.125rem;
  margin: 1rem 0 3rem;
}

.web-app-link a {
  color: var(--accent);
  font-weight: 600;
}

.web-app-link a:hover {
  color: var(--accent-hover);
}

/* ---- Prose (policy/disclaimer pages) ---- */

.prose {
  padding: 2rem 0;
}

.prose h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.prose .last-updated {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.prose h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.prose p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.prose ul,
.prose ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose strong {
  color: var(--text);
}

/* ---- Callout box ---- */

.callout {
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.callout p {
  color: var(--text);
  margin-bottom: 0;
}

/* ---- Footer ---- */

footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1rem;
  text-align: center;
}

footer .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

footer .footer-links a {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

footer .footer-links a:hover {
  color: var(--text);
}

footer .copyright {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

/* ---- Download page ---- */

.download-hero {
  text-align: center;
  padding: 4rem 0 2rem;
}

.download-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.download-hero .tagline {
  font-size: 1.125rem;
  color: var(--text-muted);
}

.download-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 2.5rem 0;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
}

.download-card--soon {
  opacity: 0.45;
}

.download-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.download-card h3 {
  font-size: 1.125rem;
  margin-bottom: 0.25rem;
}

.download-arch {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.download-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.875rem;
  transition: background 0.15s;
}

.download-btn:hover {
  background: var(--accent-hover);
  color: #fff;
  text-decoration: none;
}

.download-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

.download-web {
  margin: 1rem 0 2rem;
}

/* ---- Responsive ---- */

@media (max-width: 600px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero .tagline {
    font-size: 1rem;
  }

  footer .footer-inner {
    flex-direction: column;
    gap: 1rem;
  }

  nav {
    flex-direction: column;
    gap: 1rem;
  }
}