:root {
  --primary-color: #6200ee;
  --primary-dark: #3700b3;
  --text-color: #222;
  --bg-color: #f5f5f5;
  --card-bg: #fff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --spacing-unit: 1rem;
  --border-radius: 8px;
  --transition-speed: 0.3s;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #e0e0e0;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --shadow-color: rgba(0, 0, 0, 0.2);
  }
}

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

html {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background: var(--bg-color);
  color: var(--text-color);
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

body {
  padding: var(--spacing-unit);
  max-width: 1200px;
  margin: 0 auto;
}

h1, h2 {
  margin-bottom: var(--spacing-unit);
  text-align: center;
}

.container {
  display: grid;
  gap: var(--spacing-unit);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  padding: var(--spacing-unit);
}

@media (max-width: 600px) {
  .container {
    grid-template-columns: 1fr;
  }
}

.card, #ua-info {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1.5rem;
  margin: 1rem 0;
  line-height: 1.6;
  color: #333;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px var(--shadow-color);
}

.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px var(--shadow-color);
}

.button:active {
  transform: translateY(0);
}

#feature-list {
  list-style: none;
  padding: 0;
}

#feature-list li {
  margin-bottom: 0.5rem;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  background: var(--card-bg);
  transition: background-color var(--transition-speed);
}
  
.ipaddr {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  padding: 1.5rem;
  margin: 1rem 0;
  line-height: 1.6;
  color: #333;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
}