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

:root {
  --bg-color: #ffffff;
  --text-color: #000000;
  --border-color: #e0e0e0;
  --hover-color: #f5f5f5;
  --shadow: rgba(0, 0, 0, 0.1);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

header h1 {
  font-size: 2.5rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.sites-list {
  list-style: none;
  margin-top: 2rem;
}

.site-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.site-item:last-child {
  border-bottom: none;
}

.site-name {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1.25rem;
  font-weight: 400;
  flex: 1;
  transition: opacity 0.3s ease;
}

.site-name:hover {
  opacity: 0.6;
}

.site-details-btn {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  line-height: 1;
  transition: opacity 0.3s ease;
  margin-left: 1rem;
}

.site-details-btn:hover {
  opacity: 0.6;
}

/* Popup Styles */
.popup {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  overflow-y: auto;
  animation: fadeIn 0.3s ease;
}

.popup.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.popup-content {
  background-color: var(--bg-color);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2rem;
  position: relative;
  border: 1px solid var(--border-color);
  animation: slideUp 0.3s ease;
}

.popup-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--text-color);
  line-height: 1;
  padding: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s ease;
}

.popup-close:hover {
  opacity: 0.6;
}

#popup-body h2 {
  font-size: 1.75rem;
  font-weight: 400;
  margin-bottom: 1rem;
  padding-right: 2rem;
}

#popup-body .site-url {
  display: inline-block;
  color: var(--text-color);
  text-decoration: none;
  border-bottom: 1px solid var(--text-color);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  transition: opacity 0.3s ease;
}

#popup-body .site-url:hover {
  opacity: 0.6;
}

#popup-body .site-description {
  margin-bottom: 1.5rem;
  line-height: 1.8;
  color: #333;
}

#popup-body .additional-links {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

#popup-body .additional-links h3 {
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

#popup-body .additional-links ul {
  list-style: none;
}

#popup-body .additional-links li {
  margin-bottom: 0.75rem;
}

#popup-body .additional-links a {
  color: var(--text-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

#popup-body .additional-links a:hover {
  border-bottom-color: var(--text-color);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  header h1 {
    font-size: 2rem;
  }

  .site-item {
    padding: 0.5rem 0;
  }

  .site-name {
    font-size: 1.1rem;
  }

  .popup.active {
    padding: 1rem;
  }

  .popup-content {
    padding: 1.5rem;
    max-height: 95vh;
  }

  #popup-body h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
  }

  header h1 {
    font-size: 1.75rem;
  }

  .site-item {
    padding: 0.5rem 0;
  }

  .site-name {
    font-size: 1rem;
  }

  .popup-content {
    padding: 1.25rem;
  }

  .popup-close {
    top: 0.75rem;
    right: 0.75rem;
    font-size: 1.75rem;
  }
}