/* ===================================
   News Radar - Styles
   =================================== */

/* CSS Variables */
:root {
  /* Colors - Light Mode */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --border-color: #dee2e6;
  --accent-primary: #4361ee;
  --accent-secondary: #3a0ca3;
  --accent-ai: #7209b7;
  --accent-fraud: #f72585;
  --success: #2ecc71;
  --warning: #f39c12;
  --error: #e74c3c;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #25253d;
  --text-primary: #f8f9fa;
  --text-secondary: #adb5bd;
  --text-muted: #6c757d;
  --border-color: #3d3d5c;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-normal), color var(--transition-normal);
}

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

@media (min-width: 768px) {
  .container {
    padding: var(--spacing-xl);
  }
}

/* Header */
.header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-lg);
}

@media (min-width: 640px) {
  .header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

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

.logo-icon {
  font-size: 2rem;
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-ai));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--spacing-xs);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.btn-icon:hover {
  background: var(--bg-tertiary);
}

/* Theme Toggle */
#theme-toggle .icon-sun {
  display: none;
}

#theme-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] #theme-toggle .icon-sun {
  display: block;
}

[data-theme="dark"] #theme-toggle .icon-moon {
  display: none;
}

/* Update Button States */
.btn-loading {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Status Bar */
.status-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.status-info {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
}

.separator {
  color: var(--text-muted);
}

.update-status {
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.update-status.success {
  background: rgba(46, 204, 113, 0.1);
  color: var(--success);
}

.update-status.error {
  background: rgba(231, 76, 60, 0.1);
  color: var(--error);
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
  overflow-x: auto;
}

.tab {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.tab.active {
  color: white;
  background: var(--accent-primary);
}

.tab-count {
  font-size: 0.75rem;
  padding: 2px 6px;
  background: rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-sm);
}

.tab.active .tab-count {
  background: rgba(255, 255, 255, 0.2);
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  gap: var(--spacing-md);
  color: var(--text-secondary);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Error State */
.error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  gap: var(--spacing-md);
  text-align: center;
}

.error-icon {
  font-size: 3rem;
}

/* News Sections */
.news-section {
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--border-color);
}

.section-icon {
  font-size: 1.5rem;
}

/* News Grid (Top Stories) */
.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 640px) {
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .news-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* News Card */
.news-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  border: 1px solid var(--border-color);
}

.news-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.news-card-content {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.news-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.75rem;
}

.news-source {
  font-weight: 600;
  color: var(--accent-primary);
}

.news-date {
  color: var(--text-muted);
}

.news-category {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.news-category.ai {
  background: rgba(114, 9, 183, 0.1);
  color: var(--accent-ai);
}

.news-category.fraud {
  background: rgba(247, 37, 133, 0.1);
  color: var(--accent-fraud);
}

.news-category.both {
  background: linear-gradient(135deg, rgba(114, 9, 183, 0.1), rgba(247, 37, 133, 0.1));
  color: var(--accent-primary);
}

.news-card-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
  flex: 1;
}

.news-card-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.news-card-title a:hover {
  color: var(--accent-primary);
}

.news-card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* News List (More News) */
.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.news-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.news-item:hover {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.news-item-content {
  flex: 1;
  min-width: 0;
}

.news-item-title {
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.news-item-title a {
  color: var(--text-primary);
  text-decoration: none;
}

.news-item-title a:hover {
  color: var(--accent-primary);
}

.news-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Summary Section */
.summary-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  border: 1px solid var(--border-color);
}

.summary-content {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre-wrap;
}

.summary-content strong {
  color: var(--accent-primary);
}

.summary-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-2xl);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer a {
  color: var(--accent-primary);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.footer-disclaimer {
  margin-top: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Print styles */
@media print {
  .header-actions,
  .filter-tabs,
  #update-btn {
    display: none;
  }
  
  .news-card,
  .news-item {
    break-inside: avoid;
  }
}