/* Modern UI Improvements */
/* Design tokens are owned by styles.css — do not re-declare :root variables here */

/* Base Styles */
body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.6;
  background-color: var(--background);
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 2rem); }

p { 
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Card Component */
.news-card {
  background: var(--background);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  border: 1px solid rgba(0,0,0,0.1);
}

.dark-theme .news-card {
  border-color: rgba(255,255,255,0.1);
}

.news-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
}

/* Button Styles */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
  gap: 0.5rem;
  background-color: var(--background);
  color: var(--text-primary);
}

.button:hover {
  background-color: var(--background-alt);
}

.button-primary {
  background-color: var(--primary);
  color: white;
}

.button-primary:hover {
  background-color: var(--primary-dark);
}

/* SVG Icon Styles */
.button svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

.button.button-primary svg {
  color: white;
}

.search-icon,
.theme-icon {
  pointer-events: none;
}

/* Search Input */
.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--text-muted);
  background: var(--background);
  color: var(--text-primary);
  font-size: 1rem;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.25);
}

/* Grid Layout */
.news-grid {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  padding: var(--spacing-md) 0;
}

/* Loading States */
.loading-skeleton {
  background: linear-gradient(
    90deg,
    var(--background-alt) 0%,
    var(--background) 50%,
    var(--background-alt) 100%
  );
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

.card-image.loading-skeleton {
  height: 200px;
  margin-bottom: var(--spacing-sm);
}

.card-title.loading-skeleton {
  height: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.card-description.loading-skeleton {
  height: 4rem;
  margin-bottom: var(--spacing-sm);
}

.card-meta.loading-skeleton {
  height: 1rem;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease-out forwards;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .news-grid {
    grid-template-columns: 1fr;
  }
  
  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
}

/* Header Styles */
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Theme Toggle Button */
#theme-toggle {
  width: 40px;
  height: 40px;
  padding: 0.5rem;
  border-radius: 50%;
  background: transparent;
  color: var(--text-primary);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

#theme-toggle:hover {
  background: var(--background-alt);
  transform: rotate(15deg);
}

#theme-toggle svg {
  width: 20px;
  height: 20px;
}

.dark-theme #theme-toggle {
  color: var(--text-primary);
}