:root {
  /* Light theme */
  --main-bg-color: #f8f9fa;
  --text-color: #333;
  --link-color: #0078d7;
  --border-color: #e9ecef;
  --hover-bg-color: #e9ecef;
  --box-shadow-color: rgba(0, 0, 0, 0.1);
  --background-color: #fff;
  --button-bg-color: #0078d7;
  --button-text-color: #fff;
  --button-hover-bg-color: #0056b3;
  --button-hover-text-color: #fff;
  --header-bg-color: #0078d7;
  --header-text-color: #fff;
  --card-bg-color: #fff;
  --footer-bg-color: #343a40;
  --footer-text-color: #fff;
  --search-bg-color: #fff;
  --search-border-color: #ced4da;
  --loader-color: #0078d7;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Dark theme */
    --main-bg-color: #121212;
    --text-color: #e0e0e0;
    --link-color: #90caf9;
    --border-color: #333;
    --hover-bg-color: #333;
    --box-shadow-color: rgba(255, 255, 255, 0.1);
    --background-color: #1e1e1e;
    --button-bg-color: #90caf9;
    --button-text-color: #121212;
    --button-hover-bg-color: #64b5f6;
    --button-hover-text-color: #121212;
    --header-bg-color: #1e1e1e;
    --header-text-color: #e0e0e0;
    --card-bg-color: #2d2d2d;
    --footer-bg-color: #1e1e1e;
    --footer-text-color: #e0e0e0;
    --search-bg-color: #2d2d2d;
    --search-border-color: #444;
    --loader-color: #90caf9;
  }
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: var(--main-bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

/* Header Styles */
.site-header {
  background-color: var(--header-bg-color);
  color: var(--header-text-color);
  padding: 1rem 0;
  box-shadow: 0 2px 4px var(--box-shadow-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header h1 {
  margin: 0;
  font-size: 1.8rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.language-selector {
  display: flex;
  gap: 0.25rem;
}

.lang-btn {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--header-text-color);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.3s ease;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.lang-btn.active {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.7);
  font-weight: 600;
}

/* Main Content */
main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Feed Controls */
.feed-controls {
  margin-bottom: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--card-bg-color);
  border-radius: 8px;
  box-shadow: 0 2px 8px var(--box-shadow-color);
}

.search-container {
  display: flex;
  width: 100%;
  max-width: 500px;
}

#search-input {
  flex-grow: 1;
  padding: 0.75rem;
  border: 1px solid var(--search-border-color);
  border-right: none;
  border-radius: 4px 0 0 4px;
  font-size: 1rem;
  background-color: var(--search-bg-color);
  color: var(--text-color);
  transition: border-color 0.3s;
}

#search-input:focus {
  outline: none;
  border-color: var(--link-color);
}

#search-button {
  padding: 0.75rem 1rem;
  background-color: var(--button-bg-color);
  color: var(--button-text-color);
  border: none;
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  transition: background-color 0.3s;
}

#search-button:hover {
  background-color: var(--button-hover-bg-color);
}

/* RSS Feed Styles */
#rss-feed {
  background: var(--background-color);
  border-radius: 8px;
  box-shadow: 0 2px 8px var(--box-shadow-color);
  padding: 1.5rem;
  min-height: 300px;
  position: relative;
}

#rss-feed.loading {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: var(--text-color);
}

.loader {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-radius: 50%;
  border-top: 4px solid var(--loader-color);
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin-bottom: 2rem;
  padding: 1.5rem;
  border-radius: 8px;
  background-color: var(--card-bg-color);
  box-shadow: 0 1px 3px var(--box-shadow-color);
  transition: transform 0.2s, box-shadow 0.2s;
}

li:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 6px var(--box-shadow-color);
}

h2 {
  color: var(--link-color);
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

h4 {
  color: var(--text-color);
  opacity: 0.7;
  font-weight: normal;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

p {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

img.rss-image {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
  margin: 1rem 0;
  transition: opacity 0.3s;
}

img.rss-image:hover {
  opacity: 0.9;
}

/* Pagination Styles */
.pagination {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
  gap: 0.5rem;
}

.pagination button {
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  background-color: var(--background-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.pagination button.active {
  background-color: var(--link-color);
  color: white;
  border-color: var(--link-color);
}

.pagination button:hover:not(.active) {
  background-color: var(--hover-bg-color);
}

/* Links */
a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  text-decoration: underline;
}

/* Button Styles */
button {
  padding: 0.75rem 1.25rem;
  border-radius: 4px;
  font-weight: 500;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  background-color: var(--button-bg-color);
  color: var(--button-text-color);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

button:hover {
  background-color: var(--button-hover-bg-color);
  color: var(--button-hover-text-color);
  transform: translateY(-2px);
  box-shadow: 0 2px 4px var(--box-shadow-color);
}

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

#back-to-home {
  font-size: 0.9rem;
  padding: 0.5rem 1rem;
}

/* Footer Styles */
footer {
  background-color: var(--footer-bg-color);
  color: var(--footer-text-color);
  text-align: center;
  padding: 1.5rem 0;
  margin-top: 3rem;
}

/* Enhanced RSS Feed Styles */

/* Filter Controls */
.filter-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-container label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-color);
}

.filter-container select {
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--search-bg-color);
  color: var(--text-color);
  font-size: 0.9rem;
}

.filter-container select:focus {
  outline: none;
  border-color: var(--link-color);
}

/* View Controls */
.view-controls {
  display: flex;
  gap: 0.5rem;
}

.view-button {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--background-color);
  color: var(--text-color);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.view-button:hover {
  background: var(--hover-bg-color);
  border-color: var(--link-color);
}

.view-button.active {
  background: var(--link-color);
  color: white;
  border-color: var(--link-color);
}

/* News Header with Favorite Button */
.news-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
}

.news-title {
  flex: 1;
  margin-right: 1rem;
}

.favorite-button {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all 0.3s ease;
  opacity: 0.6;
}

.favorite-button:hover {
  opacity: 1;
  background: var(--hover-bg-color);
  color: #e91e63;
}

.favorite-button.favorited {
  color: #e91e63;
  opacity: 1;
}

.favorite-button.favorited:hover {
  color: #c2185b;
}

/* Favorites List */
.favorites-list {
  border-top: 3px solid var(--link-color);
}

.favorite-item {
  border-left: 4px solid #e91e63;
  background: linear-gradient(90deg, rgba(233, 30, 99, 0.1) 0%, transparent 100%);
}

.favorite-date {
  color: #e91e63;
  font-size: 0.8rem;
  font-weight: 500;
}

.remove-favorite {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: all 0.3s ease;
  opacity: 0.6;
  margin-left: 0.5rem;
}

.remove-favorite:hover {
  opacity: 1;
  background: var(--hover-bg-color);
  color: #f44336;
}

.back-to-all {
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--link-color);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.back-to-all:hover {
  background: var(--button-hover-bg-color);
  transform: translateY(-2px);
}

/* Loading and Error States */
.loading-indicator {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--link-color);
  animation: spin 1s ease-in-out infinite;
  margin-right: 0.5rem;
}

.error {
  text-align: center;
  padding: 2rem;
  color: #f44336;
  background: rgba(244, 67, 54, 0.1);
  border: 1px solid rgba(244, 67, 54, 0.2);
  border-radius: 8px;
  margin: 1rem 0;
}

.error i {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

/* Auto-update indicator */
.auto-update-indicator {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--link-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  box-shadow: 0 2px 8px var(--box-shadow-color);
  z-index: 1000;
  animation: fadeInOut 0.5s ease;
}

@keyframes fadeInOut {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* Responsive Design Updates */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .header-actions {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .feed-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filter-container {
    justify-content: center;
  }
  
  .view-controls {
    justify-content: center;
  }
  
  .news-header {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .favorite-button {
    align-self: flex-start;
  }
}

@media (max-width: 480px) {
  .view-controls {
    flex-wrap: wrap;
  }
  
  .view-button {
    flex: 1;
    min-width: 120px;
  }
}