* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ef4444;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: #334155;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  padding: 2rem 1rem;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
}

h1 {
  font-size: 1.875rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}

.theme-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-primary);
  transition: var(--transition);
}

.theme-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  transform: scale(0.98);
}

.controls {
  background: var(--bg-secondary);
  border-radius: 1rem;
  padding: 1.25rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
}

.search-group {
  flex: 2;
  min-width: 200px;
}

.search-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.search-wrapper {
  display: flex;
  gap: 0.5rem;
}

input, select {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  padding: 0.625rem 1rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
}

input:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-wrapper input {
  flex: 1;
}

button {
  background: var(--accent);
  border: none;
  padding: 0.625rem 1.25rem;
  border-radius: 0.75rem;
  font-weight: 600;
  color: white;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.875rem;
}

button:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.sort-group {
  min-width: 160px;
}

.filter-group {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.filter-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.stats-bar {
  background: var(--bg-secondary);
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  text-align: center;
  font-weight: 500;
}

.loader {
  text-align: center;
  padding: 3rem;
  color: var(--accent);
  font-weight: 500;
}

.loader.hidden {
  display: none;
}

.error-msg {
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid var(--danger);
  padding: 1rem;
  border-radius: 0.75rem;
  color: var(--danger);
  margin: 1rem 0;
  text-align: center;
}

.error-msg.hidden {
  display: none;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.75rem;
  margin-top: 1rem;
}

.article {
  background: var(--bg-card);
  border-radius: 1.25rem;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  animation: fadeInUp 0.4s ease backwards;
}

.article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.article-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--bg-primary);
}

.image-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--text-muted);
}

.article-body {
  padding: 1.25rem;
  flex: 1;
}

.article-source {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 1rem;
  margin-bottom: 0.75rem;
}

.article-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.article-date {
  font-size: 0.7rem;
  color: var(--text-muted);
  display: block
}

.article-footer {
  padding: 0.75rem 1.25rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.read-more {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  transition: var(--transition);
}

.read-more:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.action-buttons {
  display: flex;
  gap: 0.75rem;
}

.action-btn {
  background: transparent;
  padding: 0.3rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition);
}

.action-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.like-btn.active {
  background: #ef4444;
  border-color: #ef4444;
  color: white;
}

.fav-btn.active {
  background: #f59e0b;
  border-color: #f59e0b;
  color: white;
}

.no-results {
  text-align: center;
  padding: 3rem;
  background: var(--bg-secondary);
  border-radius: 1rem;
  color: var(--text-muted);
  font-size: 1rem;
  border: 1px solid var(--border);
}

@media (max-width: 640px) {
  body {
    padding: 1rem;
  }
  .controls {
    flex-direction: column;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .article-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}