/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
  line-height: 1.6;
  color: #2c2c2c;
  background-color: #fafafa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Main content area */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* Line container */
.line-container {
  max-width: 600px;
  width: 100%;
  text-align: center;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.line-container.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Line text */
.line-text {
  font-size: 1.5rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: #1a1a1a;
  font-weight: 400;
  letter-spacing: 0.01em;
}

/* Source attribution */
.line-source {
  display: block;
  font-size: 0.875rem;
  color: #6b6b6b;
  font-style: italic;
  letter-spacing: 0.02em;
}

/* Footer */
footer {
  padding: 1.5rem;
  text-align: center;
}

/* Tagline */
.tagline {
  margin: 0 0 0.75rem 0;
  font-size: 0.75rem;
  color: #8a8a8a;
  font-style: normal;
  letter-spacing: 0.03em;
  text-align: center;
  line-height: 1.5;
  font-weight: 400;
}

.footer-links {
  margin-top: 0.5rem;
}

.footer-link {
  font-size: 0.6875rem;
  color: #ababab;
  text-decoration: none;
  transition: color 0.2s ease;
  letter-spacing: 0.02em;
}

.footer-link:hover,
.footer-link:focus {
  color: #8a8a8a;
}

.separator {
  font-size: 0.6875rem;
  color: #ababab;
  margin: 0 0.25rem;
}

/* Tablet and larger */
@media (min-width: 768px) {
  main {
    padding: 3rem 2rem;
  }

  .line-text {
    font-size: 1.75rem;
    line-height: 1.9;
  }

  .line-source {
    font-size: 0.9375rem;
  }

  .tagline {
    font-size: 0.8125rem;
  }

  .footer-link,
  .separator {
    font-size: 0.75rem;
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .line-text {
    font-size: 2rem;
    line-height: 2;
    margin-bottom: 2rem;
  }

  .line-source {
    font-size: 1rem;
  }
}

/* High resolution screens */
@media (min-width: 1440px) {
  main {
    padding: 4rem 2rem;
  }

  .line-container {
    max-width: 700px;
  }

  .line-text {
    font-size: 2.25rem;
  }
}

/* Dark mode support (respects system preference) */
@media (prefers-color-scheme: dark) {
  body {
    background-color: #1a1a1a;
    color: #e0e0e0;
  }

  .line-text {
    color: #f5f5f5;
  }

  .line-source {
    color: #a0a0a0;
  }

  .tagline {
    color: #8a8a8a;
  }

  .footer-link {
    color: #6a6a6a;
  }

  .footer-link:hover,
  .footer-link:focus {
    color: #8a8a8a;
  }

  .separator {
    color: #6a6a6a;
  }
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .line-container {
    transition: none;
  }
}