/**
 * Card Component
 * 統一されたカードシステム
 */

/* ========================================
   Base Card Styles
   ======================================== */

.card {
  /* Layout */
  display: flex;
  flex-direction: column;
  position: relative;

  /* Appearance */
  background-color: var(--color-neutral-0);
  border: var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);

  /* Spacing */
  padding: var(--card-padding);

  /* Transitions */
  transition: var(--event-card-transition);

  /* Ensure full height in grid layouts */
  height: 100%;
}

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

/* ========================================
   Card Variants
   ======================================== */

/* Interactive Card */
.card-interactive {
  cursor: pointer;
  transition: var(--event-card-transition);
}

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

.card-interactive:active {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Outlined Card */
.card-outlined {
  box-shadow: none;
  border: 2px solid var(--color-neutral-200);
}

.card-outlined:hover {
  border-color: var(--color-primary-300);
  box-shadow: var(--shadow-md);
}

/* Filled Card */
.card-filled {
  background-color: var(--color-neutral-50);
  border: 1px solid var(--color-neutral-100);
}

/* Elevated Card */
.card-elevated {
  box-shadow: var(--shadow-lg);
  border: none;
}

.card-elevated:hover {
  box-shadow: var(--shadow-xl);
}

/* Gradient Card */
.card-gradient {
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-secondary-50) 100%);
  border: 1px solid var(--color-primary-100);
}

/* ========================================
   Card Sections
   ======================================== */

/* Card Header */
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-neutral-200);
}

.card-header:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

/* Card Title */
.card-title {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-neutral-900);
}

.card-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-colors);
}

.card-title a:hover {
  color: var(--color-primary-600);
}

/* Card Subtitle */
.card-subtitle {
  margin: var(--space-1) 0 0 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  color: var(--color-neutral-600);
  line-height: var(--line-height-normal);
}

/* Card Body */
.card-body {
  flex: 1;
  margin-bottom: var(--space-4);
}

.card-body:last-child {
  margin-bottom: 0;
}

/* Card Content */
.card-content {
  flex: 1;
  color: var(--color-neutral-700);
  line-height: var(--line-height-relaxed);
}

.card-content p {
  margin: 0 0 var(--space-3) 0;
}

.card-content p:last-child {
  margin-bottom: 0;
}

/* Card Footer */
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-neutral-200);
}

.card-footer:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

/* Card Actions */
.card-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto; /* Push to bottom in flex column */
}

.card-actions-right {
  margin-left: auto;
}

.card-actions-full {
  width: 100%;
  justify-content: center;
}

/* ========================================
   Card Sizes
   ======================================== */

.card-sm {
  padding: var(--space-4);
}

.card-lg {
  padding: var(--space-8);
}

.card-xl {
  padding: var(--space-12);
}

/* ========================================
   Card Media
   ======================================== */

/* Card Image */
.card-image {
  position: relative;
  margin: calc(-1 * var(--card-padding)) calc(-1 * var(--card-padding)) var(--space-4)
    calc(-1 * var(--card-padding));
  border-radius: var(--card-radius) var(--card-radius) 0 0;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.card-image-small img {
  height: 120px;
}

.card-image-large img {
  height: 300px;
}

/* Card Image Overlay */
.card-image-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.7) 100%);
  display: flex;
  align-items: flex-end;
  padding: var(--space-4);
  color: var(--color-neutral-0);
}

.card-image-overlay .card-title {
  color: var(--color-neutral-0);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* ========================================
   Event Card Specific Styles
   ======================================== */

.event-card {
  /* Inherit from base card */
  position: relative;
  transition: var(--event-card-transition);
}

.event-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--event-card-shadow-hover);
}

/* Event Status Badge */
.event-status-badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
}

.event-status-badge.status-upcoming {
  background-color: var(--color-info-500);
  color: var(--color-neutral-0);
}

.event-status-badge.status-ongoing {
  background-color: var(--color-success-500);
  color: var(--color-neutral-0);
}

.event-status-badge.status-completed {
  background-color: var(--color-neutral-500);
  color: var(--color-neutral-0);
}

.event-status-badge.status-cancelled {
  background-color: var(--color-error-500);
  color: var(--color-neutral-0);
}

/* Event Meta Information */
.event-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-neutral-600);
}

.event-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.event-meta-icon {
  width: var(--size-4);
  height: var(--size-4);
  flex-shrink: 0;
}

/* Event Participants Count */
.event-participants {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-neutral-50);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.event-participants-count {
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary-600);
}

/* ========================================
   Card Lists and Grids
   ======================================== */

.card-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.card-grid-sm {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-4);
}

.card-grid-lg {
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: var(--space-8);
}

.card-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

@media (max-width: 767px) {
  .card {
    padding: var(--space-4);
  }

  .card-lg {
    padding: var(--space-6);
  }

  .card-xl {
    padding: var(--space-8);
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .card-footer {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .card-actions {
    justify-content: center;
  }

  .event-meta {
    font-size: var(--font-size-xs);
    gap: var(--space-3);
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .card-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

/* ========================================
   Dark Mode Support
   ======================================== */

@media (prefers-color-scheme: dark) {
  .card {
    background-color: var(--color-neutral-100);
    border-color: var(--color-neutral-200);
  }

  .card-filled {
    background-color: var(--color-neutral-200);
    border-color: var(--color-neutral-300);
  }

  .card-header {
    border-bottom-color: var(--color-neutral-300);
  }

  .card-footer {
    border-top-color: var(--color-neutral-300);
  }

  .card-title {
    color: var(--color-neutral-900);
  }

  .card-subtitle {
    color: var(--color-neutral-700);
  }

  .card-content {
    color: var(--color-neutral-800);
  }

  .event-meta {
    color: var(--color-neutral-700);
  }

  .event-participants {
    background-color: var(--color-neutral-200);
  }
}

/* ========================================
   Accessibility Enhancements
   ======================================== */

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card {
    border-width: 2px;
  }

  .card-outlined {
    border-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .card,
  .card-interactive,
  .event-card {
    transition: none;
  }

  .card:hover,
  .card-interactive:hover,
  .event-card:hover {
    transform: none;
  }
}

/* Focus styles for interactive cards */
.card-interactive:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}