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

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #475569;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
  flex: 1;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 2rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #60a5fa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.info-section {
  background-color: var(--bg-secondary);
  border-radius: 12px;
  padding: 2rem;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.info-section:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.1);
}

.info-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.ip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.ip-card {
  background-color: var(--bg-tertiary);
  border-radius: 8px;
  padding: 1.5rem;
  border: 1px solid var(--border);
  text-align: center;
  transition: all 0.3s ease;
}

.ip-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.ip-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.ip-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  font-family: "Courier New", monospace;
  word-break: break-all;
}

.ip-value.empty {
  color: var(--text-secondary);
  font-size: 1rem;
}

.about-content {
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-content p {
  margin-bottom: 1.5rem;
}

.features {
  margin-top: 1rem;
}

.features h3 {
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.features ul {
  list-style: none;
  padding-left: 1rem;
}

.features li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.features li:before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  header h1 {
    font-size: 2rem;
  }

  .info-section {
    padding: 1.5rem;
  }

  .ip-grid {
    grid-template-columns: 1fr;
  }
}

/* Loading animation */
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}