:root {
  --bg: #f7f8fb;
  --accent: #17a2ff;
  --accent-light: #5bc0eb;
  --text: #222;
  --muted: #666;
  --spacing: clamp(1rem, 3vw, 2rem);
  --container: min(1200px, 90vw);
  --radius: 12px;
}

* { box-sizing: border-box }

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  line-height: 1.3;
  margin: 0 0 0.5em;
}

p { margin: 0 0 1em }

.wrap {
  width: var(--container);
  margin: 0 auto;
  padding: var(--spacing);
}

.site-header {
  background: #fff;
  border-bottom: 1px solid #eee;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 0.75);
  padding: calc(var(--spacing) * 0.5) 0;
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  flex-shrink: 0;
}

.header-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.header-text h1 {
  font-size: 1.25rem;
  margin: 0;
  line-height: 1.2;
}

.tagline {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.2;
}

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing) * 2);
  padding: calc(var(--spacing) * 2) 0;
}

.hero-content {
  max-width: 600px;
}

.hero-content h2 {
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  margin-bottom: var(--spacing);
}

.hero-content p {
  font-size: clamp(1rem, 3vw, 1.25rem);
  color: var(--muted);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing);
  margin: calc(var(--spacing) * 2) 0;
}

.feature-item {
  background: #fff;
  padding: var(--spacing);
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  transition: transform 0.2s ease;
}

.feature-item:hover {
  transform: translateY(-2px);
}

.feature-item h3 {
  color: var(--accent);
  font-size: 1.2rem;
  margin-bottom: 0.5em;
}

.feature-item p {
  color: var(--muted);
  margin: 0;
  font-size: 0.95rem;
}

.hero-image {
  position: relative;
  padding: var(--spacing);
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, var(--bg) 60%, rgba(247,248,251,0) 100%);
  pointer-events: none;
}

.screenshot {
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  border-radius: var(--radius);
  display: block;
  position: relative;
  z-index: 1;
}

.cta {
  text-align: center;
  padding: calc(var(--spacing) * 2);
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: white;
  border-radius: var(--radius);
  margin: calc(var(--spacing) * 2) 0;
}

.cta-content {
  max-width: 400px;
  margin: 0 auto;
}

.cta h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5em;
}

.cta p {
  margin: 0;
  opacity: 0.9;
}

.qr-container {
  margin-top: var(--spacing);
  padding: var(--spacing);
  background: white;
  border-radius: var(--radius);
  display: inline-block;
}

.qrcode {
  display: block;
  border-radius: 8px;
  max-width: 160px;
  height: auto;
}

.qr-hint {
  color: var(--text);
  margin-top: 8px;
  font-size: 0.9rem;
}

.site-footer {
  margin-top: calc(var(--spacing) * 2);
  padding: var(--spacing) 0;
  background: #fff;
  border-top: 1px solid #eee;
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
  text-align: center;
}

.footer-links {
  display: flex;
  gap: var(--spacing);
  justify-content: center;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

@media (min-width: 768px) {
  .hero {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .screenshot {
    margin: 0;
  }
}