/* ==========================================================================
   Article Card Component System - Premium News Portal
   ========================================================================== */

/* Base Article Card */
.article-card {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

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

.article-card__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  flex-shrink: 0;
}

.article-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.article-card:hover .article-card__image {
  transform: scale(1.05);
}

.article-card__category {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 2;
}

.article-card__type {
  position: absolute;
  bottom: var(--space-3);
  right: var(--space-3);
  z-index: 2;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  border-radius: var(--radius-full);
  color: white;
  font-size: var(--text-sm);
}

.article-card__content {
  padding: var(--space-4) var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  margin-bottom: var(--space-3);
  flex: 1;
}

.article-card__title a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.article-card__title a:hover {
  color: var(--color-accent);
}

.article-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.article-card__author {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

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

.article-card__read-time {
  color: var(--color-text-light);
  font-size: var(--text-xs);
}

/* Card Variants */

/* Hero Card */
.article-card--hero {
  border-radius: var(--radius-xl);
}

.article-card--hero .article-card__media {
  aspect-ratio: 16 / 9;
}

.article-card--hero .article-card__content {
  padding: var(--space-6) var(--space-8);
}

.article-card--hero .article-card__title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-extrabold);
}

.article-card--hero .article-card__title a {
  color: var(--color-text-inverse);
}

.article-card--hero .article-card__meta {
  color: rgba(255, 255, 255, 0.8);
}

.article-card--hero .article-card__category {
  background: var(--color-accent);
}

/* Featured Card with Overlay */
.article-card--overlay .article-card__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-6);
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.85) 0%,
    rgba(0, 0, 0, 0.4) 60%,
    transparent 100%
  );
  z-index: 1;
}

.article-card--overlay .article-card__title a,
.article-card--overlay .article-card__meta {
  color: var(--color-text-inverse);
}

.article-card--overlay .article-card__title a:hover {
  color: var(--color-gold-light);
}

/* Compact Card (Sidebar) */
.article-card--compact {
  flex-direction: row;
  border-radius: var(--radius-md);
  box-shadow: none;
  border-bottom: 1px solid var(--color-border);
  border-radius: 0;
  padding: var(--space-3) 0;
}

.article-card--compact:hover {
  transform: none;
  box-shadow: none;
}

.article-card--compact .article-card__media {
  aspect-ratio: 4 / 3;
  width: 100px;
  min-width: 100px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-right: var(--space-3);
}

.article-card--compact .article-card__content {
  padding: 0;
}

.article-card--compact .article-card__title {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-1);
}

.article-card--compact .article-card__meta {
  font-size: var(--text-xs);
}

/* Horizontal Card */
.article-card--horizontal {
  flex-direction: row;
  border-radius: var(--radius-lg);
}

.article-card--horizontal .article-card__media {
  width: 40%;
  min-width: 200px;
  aspect-ratio: auto;
}

.article-card--horizontal .article-card__content {
  flex: 1;
}

/* Loading Skeleton */
.article-card--skeleton .article-card__media {
  background: linear-gradient(
    90deg,
    var(--color-bg-muted) 0%,
    var(--color-bg-subtle) 50%,
    var(--color-bg-muted) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
}

.article-card--skeleton .article-card__title,
.article-card--skeleton .article-card__meta {
  background: var(--color-bg-muted);
  border-radius: var(--radius-sm);
  height: 1em;
  margin-bottom: var(--space-2);
}

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

/* Premium Buttons */
.btn-premium {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-premium--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.btn-premium--primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-text-inverse);
}

.btn-premium--accent {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-color: var(--color-accent);
}

.btn-premium--accent:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: var(--color-text-inverse);
}

.btn-premium--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn-premium--outline:hover {
  background: var(--color-text);
  color: var(--color-text-inverse);
  border-color: var(--color-text);
}

.btn-premium--ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: transparent;
  padding: var(--space-2) var(--space-4);
}

.btn-premium--ghost:hover {
  background: rgba(233, 69, 96, 0.08);
}

/* Icon Button */
.btn-icon {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--color-bg-muted);
  color: var(--color-accent);
}

/* Reading Progress Bar */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--color-accent);
  z-index: var(--z-fixed);
  transition: width 100ms linear;
  box-shadow: var(--shadow-glow);
}

/* Premium Badge */
.badge-premium {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
}

.badge-premium--gold {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-primary-dark);
}

.badge-premium--accent {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

.badge-premium--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Premium Divider */
.divider-premium {
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    var(--color-border),
    transparent
  );
  margin: var(--space-8) 0;
}

/* Premium Container */
.container-premium {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Section spacing */
.section {
  padding: var(--space-12) 0;
}

.section-sm {
  padding: var(--space-8) 0;
}

.section-lg {
  padding: var(--space-16) 0;
}

/* Grid utilities */
.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.grid-3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Sticky element */
.sticky-element {
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  align-self: start;
}

/* Premium Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-muted);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--radius-full);
}

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

/* Selection */
::selection {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

/* Image loading optimization */
img {
  max-width: 100%;
  height: auto;
}

img[loading="lazy"] {
  content-visibility: auto;
}

/* Aspect ratio placeholders to prevent CLS */
.img-aspect-16-9 {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.img-aspect-4-3 {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.img-aspect-1-1 {
  aspect-ratio: 1 / 1;
  object-fit: cover;
}