/**
 * CS Substack - Frontend Styles
 *
 * Layouts: Grid, List, Masonry
 * Uses CSS variables injected by the PHP shortcode.
 */

/* -----------------------------------------------------------------------------
   CSS Variables (fallbacks when not injected)
   ----------------------------------------------------------------------------- */
.substack-embed-wrapper {
  --cols: 3;
  --accent: #ff6719;
  --title-hover: #ff6719;
  --border-hover: #ff6719;
  --radius: 12px;
  --bg: #ffffff;
  --text: #1a1a1a;
  --gap: 24px;
  --list-image-width: 250px;
  --btn-text: #ffffff;
}

/* -----------------------------------------------------------------------------
   Base Wrapper
   ----------------------------------------------------------------------------- */
.substack-embed-wrapper {
  box-sizing: border-box;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.5;
}

.substack-embed-wrapper *,
.substack-embed-wrapper *::before,
.substack-embed-wrapper *::after {
  box-sizing: border-box;
}

/* -----------------------------------------------------------------------------
   A. Grid Layout
   ----------------------------------------------------------------------------- */
.substack-embed-wrapper.layout-grid .substack-embed-posts {
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  gap: var(--gap);
}

@media (max-width: 768px) {
  .substack-embed-wrapper.layout-grid .substack-embed-posts {
    grid-template-columns: 1fr;
  }
}

/* -----------------------------------------------------------------------------
   B. List Layout
   ----------------------------------------------------------------------------- */
.substack-embed-wrapper.layout-list .substack-embed-posts {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.substack-embed-wrapper.layout-list .substack-embed-card {
  display: flex;
}

.substack-embed-wrapper.layout-list .substack-embed-link {
  display: flex;
  flex-direction: row;
  width: 100%;
  align-items: stretch;
}

.substack-embed-wrapper.layout-list .substack-embed-card-image {
  flex: 0 0 var(--list-image-width);
  width: var(--list-image-width);
  min-height: 180px;
}

.substack-embed-wrapper.layout-list .substack-embed-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.substack-embed-wrapper.layout-list .substack-embed-card-body {
  flex: 1;
  min-width: 0;
}

.substack-embed-wrapper.layout-list .substack-embed-card-image:first-child {
  border-radius: var(--radius) 0 0 var(--radius);
}

.substack-embed-wrapper.layout-list .substack-embed-card-image-placeholder {
  border-radius: var(--radius) 0 0 var(--radius);
}

/* List layout: no image - body gets full radius */
.substack-embed-wrapper.layout-list .substack-embed-link:not(:has(.substack-embed-card-image)) .substack-embed-card-body {
  border-radius: var(--radius);
}

@media (max-width: 768px) {
  .substack-embed-wrapper.layout-list .substack-embed-link {
    flex-direction: column;
  }

  .substack-embed-wrapper.layout-list .substack-embed-card-image {
    flex: 0 0 auto;
    width: 100%;
    min-height: 200px;
  }

  .substack-embed-wrapper.layout-list .substack-embed-card-image:first-child {
    border-radius: var(--radius) var(--radius) 0 0;
  }

  .substack-embed-wrapper.layout-list .substack-embed-card-image-placeholder {
    border-radius: var(--radius) var(--radius) 0 0;
  }
}

/* -----------------------------------------------------------------------------
   C. Masonry Layout
   ----------------------------------------------------------------------------- */
.substack-embed-wrapper.layout-masonry .substack-embed-posts {
  column-count: var(--cols);
  column-gap: var(--gap);
}

.substack-embed-wrapper.layout-masonry .substack-embed-card {
  break-inside: avoid;
  margin-bottom: var(--gap);
}

@media (max-width: 768px) {
  .substack-embed-wrapper.layout-masonry .substack-embed-posts {
    column-count: 1;
  }
}

/* -----------------------------------------------------------------------------
   Card Structure
   ----------------------------------------------------------------------------- */
.substack-embed-card {
  background: var(--bg);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.substack-embed-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

/* Border on hover (customizable) */
.substack-embed-wrapper.theme-light .substack-embed-card:hover,
.substack-embed-wrapper.theme-dark .substack-embed-card:hover {
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15), 0 0 0 2px var(--border-hover);
}

.substack-embed-wrapper.theme-transparent .substack-embed-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.substack-embed-wrapper.theme-transparent .substack-embed-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
}

.substack-embed-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.substack-embed-wrapper .substack-embed-card a:focus-visible,
.substack-embed-wrapper .substack-embed-link:focus-visible {
  outline: 2px solid var(--accent, #ff6719);
  outline-offset: 2px;
}

/* -----------------------------------------------------------------------------
   Card Image
   ----------------------------------------------------------------------------- */
.substack-embed-card-image {
  overflow: hidden;
  background: #e5e5e5;
  position: relative;
}

.substack-embed-wrapper.layout-grid .substack-embed-card-image,
.substack-embed-wrapper.layout-masonry .substack-embed-card-image {
  border-radius: var(--radius) var(--radius) 0 0;
}

.substack-embed-card-image img {
  display: block;
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.substack-embed-card:hover .substack-embed-card-image img {
  transform: scale(1.03);
}

/* Placeholder when no image */
.substack-embed-card-image-placeholder {
  min-height: 200px;
  background: linear-gradient(135deg, #e5e5e5 0%, #d0d0d0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.substack-embed-wrapper.theme-dark .substack-embed-card-image-placeholder {
  background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
}

/* -----------------------------------------------------------------------------
   Card Body
   ----------------------------------------------------------------------------- */
.substack-embed-card-body {
  padding: 20px;
}

.substack-embed-card-title {
  margin: 0 0 10px;
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  transition: color 0.2s ease;
}

.substack-embed-card:hover .substack-embed-card-title {
  color: var(--title-hover);
}

.substack-embed-card-date {
  display: block;
  font-size: 0.8125rem;
  color: var(--text);
  opacity: 0.7;
  margin-bottom: 8px;
}

.substack-embed-card-excerpt {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text);
  opacity: 0.85;
  line-height: 1.5;
}

/* -----------------------------------------------------------------------------
   Messages (Error / Empty)
   ----------------------------------------------------------------------------- */
.substack-embed-error,
.substack-embed-empty {
  padding: 16px 20px;
  background: #f8d7da;
  color: #721c24;
  border-radius: 8px;
  margin: 0;
}

.substack-embed-empty {
  background: #f8f9fa;
  color: #6c757d;
}

/* -----------------------------------------------------------------------------
   Load More Button
   ----------------------------------------------------------------------------- */
.substack-embed-load-more-wrap {
  margin-top: 32px;
  text-align: center;
}

.substack-embed-load-more {
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--btn-text, #ffffff);
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.substack-embed-wrapper .substack-embed-load-more:focus-visible {
  outline: 2px solid var(--accent, #ff6719);
  outline-offset: 2px;
}

.substack-embed-load-more:hover:not(:disabled) {
  opacity: 0.9;
}

.substack-embed-load-more:active:not(:disabled) {
  transform: scale(0.98);
}

.substack-embed-load-more:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.substack-embed-wrapper .substack-embed-error {
  text-align: center;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: #cc0000;
}

.substack-embed-wrapper .substack-embed-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}