/* ==========================================================================
   DarkRose AI News — Pure PHP/HTML Theme
   Adapted from darkrose-child WordPress theme
   ========================================================================== */

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* Colors */
  --dr-bg-primary: #0a0a0a;
  --dr-bg-secondary: #111111;
  --dr-bg-card: #161616;
  --dr-bg-card-hover: #1c1c1c;
  --dr-bg-elevated: #1a1a1a;
  --dr-border: #2a2a2a;
  --dr-border-subtle: #1e1e1e;

  --dr-text-primary: #e0e0e0;
  --dr-text-secondary: #999999;
  --dr-text-muted: #666666;

  --dr-accent: #c44569;
  --dr-accent-hover: #d4567a;
  --dr-accent-subtle: rgba(196, 69, 105, 0.15);

  /* Typography */
  --dr-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --dr-font-heading: 'Space Grotesk', 'Inter', sans-serif;
  --dr-font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --dr-space-xs: 0.25rem;
  --dr-space-sm: 0.5rem;
  --dr-space-md: 1rem;
  --dr-space-lg: 1.5rem;
  --dr-space-xl: 2rem;
  --dr-space-2xl: 3rem;
  --dr-space-3xl: 4rem;

  /* Border Radius */
  --dr-radius-sm: 6px;
  --dr-radius-md: 10px;
  --dr-radius-lg: 16px;

  /* Shadows */
  --dr-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --dr-shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --dr-transition: 0.2s ease;
  --dr-transition-slow: 0.3s ease;

  /* Layout */
  --dr-max-width: 1200px;
  --dr-content-width: 800px;
}

/* ==========================================================================
   Global Reset & Base
   ========================================================================== */

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

body {
  background-color: var(--dr-bg-primary);
  color: var(--dr-text-primary);
  font-family: var(--dr-font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background: var(--dr-accent);
  color: #ffffff;
}

a {
  color: var(--dr-accent);
  text-decoration: none;
  transition: color var(--dr-transition);
}

a:hover,
a:focus {
  color: var(--dr-accent-hover);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4 {
  font-family: var(--dr-font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--dr-text-primary);
}

code {
  background: var(--dr-bg-elevated);
  color: var(--dr-accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--dr-font-mono);
  font-size: 0.9em;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
  max-width: var(--dr-max-width);
  margin: 0 auto;
  padding: var(--dr-space-xl) var(--dr-space-lg);
}

.site-main {
  flex: 1;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  background-color: var(--dr-bg-secondary);
  border-bottom: 1px solid var(--dr-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--dr-max-width);
  margin: 0 auto;
  padding: var(--dr-space-md) var(--dr-space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--dr-space-lg);
}

.site-logo {
  color: var(--dr-text-primary);
  font-family: var(--dr-font-heading);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.site-logo:hover {
  color: var(--dr-text-primary);
}

.accent-dot {
  color: var(--dr-accent);
}

/* Navigation */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--dr-space-xs);
  flex-wrap: wrap;
  align-items: center;
}

.nav-links li a {
  color: var(--dr-text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: var(--dr-space-xs) var(--dr-space-sm);
  border-radius: var(--dr-radius-sm);
  transition: all var(--dr-transition);
  white-space: nowrap;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--dr-accent);
  background: var(--dr-accent-subtle);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--dr-space-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--dr-text-primary);
  border-radius: 2px;
  transition: all var(--dr-transition);
}

/* ==========================================================================
   Card Grid
   ========================================================================== */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--dr-space-lg);
}

.card {
  background-color: var(--dr-bg-card);
  border: 1px solid var(--dr-border-subtle);
  border-radius: var(--dr-radius-md);
  box-shadow: var(--dr-shadow-card);
  transition: all var(--dr-transition);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--dr-border);
  box-shadow: var(--dr-shadow-card-hover);
  transform: translateY(-2px);
}

.card-image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.card-body {
  padding: var(--dr-space-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-title {
  font-size: 1.1rem;
  margin: var(--dr-space-sm) 0;
  line-height: 1.4;
}

.card-title a {
  color: var(--dr-text-primary);
}

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

.card-excerpt {
  color: var(--dr-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  flex: 1;
  margin-bottom: var(--dr-space-md);
}

.card-meta {
  color: var(--dr-text-muted);
  font-size: 0.8rem;
  margin-top: auto;
}

/* ==========================================================================
   Source Badges
   ========================================================================== */

.source-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--dr-space-xs);
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.source-badge--openai {
  background: rgba(16, 163, 127, 0.15);
  color: #10a37f;
}

.source-badge--anthropic {
  background: rgba(204, 133, 63, 0.15);
  color: #cc853f;
}

.source-badge--google {
  background: rgba(66, 133, 244, 0.15);
  color: #4285f4;
}

.source-badge--meta {
  background: rgba(0, 132, 255, 0.15);
  color: #0084ff;
}

.source-badge--deepmind {
  background: rgba(66, 133, 244, 0.15);
  color: #4285f4;
}

.source-badge--techcrunch {
  background: rgba(10, 185, 60, 0.15);
  color: #0ab93c;
}

.source-badge--theverge {
  background: rgba(234, 55, 130, 0.15);
  color: #ea3782;
}

.source-badge--arstechnica {
  background: rgba(255, 76, 0, 0.15);
  color: #ff4c00;
}

.source-badge--microsoft {
  background: rgba(0, 120, 212, 0.15);
  color: #0078d4;
}

.source-badge--nvidia {
  background: rgba(118, 185, 0, 0.15);
  color: #76b900;
}

.source-badge--default {
  background: var(--dr-accent-subtle);
  color: var(--dr-accent);
}

/* ==========================================================================
   Single Article
   ========================================================================== */

.article-single {
  max-width: var(--dr-content-width);
  margin: 0 auto;
  background-color: var(--dr-bg-card);
  border: 1px solid var(--dr-border-subtle);
  border-radius: var(--dr-radius-md);
  padding: var(--dr-space-2xl);
  box-shadow: var(--dr-shadow-card);
}

.article-image img {
  width: 100%;
  border-radius: var(--dr-radius-sm);
  aspect-ratio: 16 / 9;
  object-fit: cover;
  margin-bottom: var(--dr-space-xl);
}

.article-header {
  margin-bottom: var(--dr-space-xl);
}

.article-header h1 {
  font-size: 1.8rem;
  margin-top: var(--dr-space-md);
}

.article-meta {
  color: var(--dr-text-muted);
  font-size: 0.85rem;
  margin-top: var(--dr-space-sm);
}

.meta-sep {
  margin: 0 var(--dr-space-sm);
}

.article-content {
  color: var(--dr-text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: var(--dr-space-xl);
}

.article-content p {
  margin-bottom: var(--dr-space-md);
}

.article-content h2 {
  margin-top: var(--dr-space-2xl);
  margin-bottom: var(--dr-space-md);
  font-size: 1.3rem;
}

/* Original source link box */
.original-source {
  margin-top: var(--dr-space-xl);
  padding: var(--dr-space-lg);
  background: var(--dr-bg-elevated);
  border: 1px solid var(--dr-border);
  border-radius: var(--dr-radius-sm);
  display: flex;
  flex-direction: column;
  gap: var(--dr-space-sm);
}

.original-label {
  color: var(--dr-text-muted);
  font-size: 0.85rem;
}

.original-link {
  font-weight: 600;
  font-size: 1rem;
}

/* Article navigation */
.article-nav {
  margin-top: var(--dr-space-xl);
  padding-top: var(--dr-space-lg);
  border-top: 1px solid var(--dr-border-subtle);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--dr-space-md);
}

.back-link {
  color: var(--dr-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--dr-transition);
}

.back-link:hover {
  color: var(--dr-accent);
}

/* ==========================================================================
   Category Header
   ========================================================================== */

.category-header {
  margin-bottom: var(--dr-space-xl);
}

.category-header h1 {
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  gap: var(--dr-space-sm);
}

.category-count {
  color: var(--dr-text-muted);
  font-size: 0.9rem;
  margin-top: var(--dr-space-xs);
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--dr-space-sm);
  margin-top: var(--dr-space-2xl);
  flex-wrap: wrap;
}

.page-link {
  background: var(--dr-bg-card);
  color: var(--dr-text-secondary);
  border: 1px solid var(--dr-border);
  border-radius: var(--dr-radius-sm);
  padding: var(--dr-space-sm) var(--dr-space-md);
  font-size: 0.9rem;
  transition: all var(--dr-transition);
}

.page-link:hover,
.page-link.active {
  background: var(--dr-accent);
  color: #ffffff;
  border-color: var(--dr-accent);
}

.page-dots {
  color: var(--dr-text-muted);
  padding: 0 var(--dr-space-xs);
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
  text-align: center;
  padding: var(--dr-space-3xl) var(--dr-space-xl);
}

.empty-state h2 {
  margin-bottom: var(--dr-space-md);
  color: var(--dr-text-secondary);
}

.empty-state p {
  color: var(--dr-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--dr-bg-secondary);
  border-top: 1px solid var(--dr-border);
  color: var(--dr-text-muted);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--dr-max-width);
  margin: 0 auto;
  padding: var(--dr-space-lg);
  text-align: center;
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--dr-text-secondary);
}

.site-footer a:hover {
  color: var(--dr-accent);
}

/* ==========================================================================
   Scrollbar
   ========================================================================== */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dr-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--dr-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--dr-text-muted);
}

/* ==========================================================================
   Utility
   ========================================================================== */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

.loading-skeleton {
  background: linear-gradient(
    90deg,
    var(--dr-bg-card) 25%,
    var(--dr-bg-elevated) 50%,
    var(--dr-bg-card) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--dr-radius-sm);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
  :root {
    --dr-space-lg: 1rem;
    --dr-space-xl: 1.5rem;
    --dr-space-2xl: 2rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .header-inner {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding-top: var(--dr-space-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links li a {
    display: block;
    padding: var(--dr-space-sm) var(--dr-space-md);
    border-radius: var(--dr-radius-sm);
  }

  .article-single {
    padding: var(--dr-space-lg);
  }

  .article-header h1 {
    font-size: 1.4rem;
  }

  .article-nav {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .source-badge {
    font-size: 0.65rem;
  }

  .article-content {
    font-size: 0.95rem;
  }

  .card-title {
    font-size: 1rem;
  }
}