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

:root {
  --bg-base: #080c14;
  --bg-card: #0d1117;
  --bg-border: #ffffff12;
  --bg-elevated: #131a24;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #718096;
  --zone-silent: #2ecc71;
  --zone-quiet: #00bcd4;
  --zone-good: #76ff03;
  --zone-loud: #ffc107;
  --zone-too-loud: #ff1744;
  --font-ui: "SF Pro Display", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", "Courier New", monospace;
}

html {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* Hero */
.hero {
  text-align: center;
  padding: 80px 0 48px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--zone-good), var(--zone-quiet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .tagline {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 40px;
}

/* Download buttons */
.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.btn-primary {
  background: linear-gradient(135deg, var(--zone-good), var(--zone-quiet));
  color: #080c14;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--bg-border);
}

.btn-store {
  background: #0078d4;
  color: #fff;
}

.download-note {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin: 64px 0;
}

.feature {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: 12px;
  padding: 24px;
}

.feature h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.feature p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Zone bar demo */
.zone-bar {
  display: flex;
  gap: 4px;
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
  margin: 32px 0;
}

.zone-bar span {
  flex: 1;
  border-radius: 4px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 48px 0 32px;
  color: var(--text-muted);
  font-size: 14px;
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 16px;
}

/* Prose (privacy page) */
.prose {
  padding-top: 48px;
}

.prose h1 {
  font-size: 36px;
  margin-bottom: 8px;
}

.prose h2 {
  font-size: 20px;
  margin: 32px 0 12px;
  color: var(--text-primary);
}

.prose p,
.prose li {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.prose ul {
  padding-left: 24px;
}

.prose a {
  color: var(--zone-quiet);
}

.prose .updated {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 32px;
}

.back-link {
  display: inline-block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 32px;
}

.back-link:hover {
  color: var(--text-primary);
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 40px;
  }

  .hero .tagline {
    font-size: 17px;
  }

  .downloads {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    justify-content: center;
  }
}