/* Shared base styles — kept deliberately small and dependency-free for fast load */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  color: #1a1a1a;
  background: #fff;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  transition: transform 0.15s ease;
}
.btn:active { transform: scale(0.97); }

section { padding: 64px 0; }

h1, h2, h3 { line-height: 1.2; }

.demo-banner {
  background: #1a1a1a;
  color: #fff;
  text-align: center;
  padding: 10px 16px;
  font-size: 0.9rem;
}
.demo-banner a { color: #fff; text-decoration: underline; }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  opacity: 0.75;
}

@media (max-width: 640px) {
  section { padding: 44px 0; }
  h1 { font-size: 1.9rem; }
}