:root {
  --background: #f5f5f7;
  --container-bg: #ffffff;
  --text-color: #1c1b18;
  --primary-color: #007aff;
  --header-bg: #007aff;
  --header-text: #ffffff;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: -apple-system, system-ui, sans-serif;
  background-color: var(--background);
  color: var(--text-color);
}
header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 1rem 0;
  text-align: center;
}
header h1 {
  margin: 0;
  font-size: 2rem;
}
nav.main {
  margin-top: 0.5rem;
}
nav.main a {
  margin: 0 1rem;
  color: var(--header-text);
  text-decoration: none;
  font-weight: 500;
}
nav.main a:hover {
  text-decoration: underline;
}
.container {
  max-width: 800px;
  margin: 2rem auto;
  background-color: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 2rem;
  border-radius: 20px;
  color: #ffffff;
}
ul.links {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}
ul.links li {
  margin: 0.75rem 0;
}
ul.links a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}
ul.links a:hover {
  text-decoration: underline;
}
nav.breadcrumb {
  font-size: 0.875rem;
  margin-bottom: 1rem;
}
nav.breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
}
nav.breadcrumb a:hover {
  text-decoration: underline;
}
@media (prefers-color-scheme: dark) {
  :root {
    --background: #121212;
    --container-bg: #1e1e1e;
    --text-color: #f5f5f7;
    --header-bg: #0a84ff;
  }
}

/* App UI Typography */
.container h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}
.container h2 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}
.container p,
.container ul {
  margin: 1rem 0;
  line-height: 1.6;
}
.container ul li {
  margin: 0.5rem 0;
}

/* Button Links on Homepage */
ul.links li a {
  display: block;
  padding: 0.75rem;
  background-color: var(--primary-color);
  color: #ffffff;
  text-decoration: none;
  border-radius: 6px;
}
ul.links li a:hover {
  opacity: 0.9;
}

/* Gradient background for full-page layout */
.gradient-bg {
  min-height: 100vh;
  background: linear-gradient(135deg, #3B8FFF 0%, #8A3BFF 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}