/* ===============================================
   SLIDES MODULE — Foundation + Viewer Styles
   =============================================== */

/* -----------------------------------------------
   Slide Viewer Component
   ----------------------------------------------- */

.slide-viewer {
  background: #0f0f0f;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  outline: none;
  user-select: none;
  margin-bottom: var(--space-6);
}

.slide-viewer:focus-visible {
  box-shadow: 0 0 0 3px var(--color-primary);
}

/* Toolbar */
.slide-viewer__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: #1a1a1a;
  color: #ccc;
  font-size: 0.8125rem;
}

.slide-viewer__counter {
  white-space: nowrap;
}

.slide-viewer__toolbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.slide-viewer__toolbar-actions button,
.slide-viewer__toolbar-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: #ccc;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.slide-viewer__toolbar-actions button:hover,
.slide-viewer__toolbar-actions a:hover {
  background: #333;
  color: #fff;
}

/* Stage */
.slide-viewer__stage {
  position: relative;
  display: flex;
  align-items: center;
}

.slide-viewer__slides {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  overflow: hidden;
}

.slide-viewer__slide {
  display: none;
  width: 100%;
  text-align: center;
}

.slide-viewer__slide--active {
  display: block;
}

.slide-viewer__img {
  max-width: 100%;
  max-height: 75vh;
  height: auto;
  display: block;
  margin: 0 auto;
  object-fit: contain;
}

/* Nav buttons */
.slide-viewer__prev,
.slide-viewer__next {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.slide-viewer__prev { left: 0; }
.slide-viewer__next { right: 0; }

.slide-viewer__prev:hover,
.slide-viewer__next:hover {
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
}

.slide-viewer__prev:disabled,
.slide-viewer__next:disabled {
  opacity: 0.25;
  cursor: default;
}

.slide-viewer__prev:disabled:hover,
.slide-viewer__next:disabled:hover {
  background: transparent;
  color: rgba(255, 255, 255, 0.6);
}

/* Grid overlay */
.slide-viewer__grid {
  position: absolute;
  inset: 0;
  z-index: 10;
  background: rgba(0, 0, 0, 0.92);
  overflow-y: auto;
  padding: var(--space-4);
}

.slide-viewer__grid-inner {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-3);
  max-width: 900px;
  margin: 0 auto;
}

.slide-viewer__grid-item {
  position: relative;
  background: transparent;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  padding: 0;
  transition: border-color 0.15s ease;
}

.slide-viewer__grid-item:hover {
  border-color: var(--color-primary-light);
}

.slide-viewer__grid-item--active {
  border-color: var(--color-primary);
}

.slide-viewer__grid-item img {
  width: 100%;
  display: block;
}

.slide-viewer__grid-num {
  position: absolute;
  bottom: 2px;
  right: 4px;
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.7);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}

/* Fullscreen adjustments */
.slide-viewer:fullscreen {
  border-radius: 0;
  display: flex;
  flex-direction: column;
}

.slide-viewer:fullscreen .slide-viewer__stage {
  flex: 1;
}

.slide-viewer:fullscreen .slide-viewer__img {
  max-height: calc(100vh - 48px);
}

.slide-viewer:fullscreen .slide-viewer__grid {
  position: fixed;
}

/* Mobile: hide prev/next text, smaller buttons */
@media (max-width: 640px) {
  .slide-viewer__prev,
  .slide-viewer__next {
    width: 36px;
  }

  .slide-viewer__grid-inner {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--space-2);
  }
}

/* -----------------------------------------------
   Listing Page
   ----------------------------------------------- */

.slides-listing__desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.slides-listing__content {
  margin-bottom: var(--space-8);
}

/* Filters */
.slides-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.slides-filters__group {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.slides-filters__label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.slides-filters__select {
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-background);
  color: var(--color-text-primary);
  cursor: pointer;
}

.slides-filters__count {
  margin-left: auto;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Card Grid */
.slides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

/* Wrapper for filter script only — no border/shadow to avoid stacking with .slide-card */
.slides-grid__item {
  border: none;
  box-shadow: none;
}

.slides-grid--compact {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-4);
}

/* -----------------------------------------------
   Slide Card
   ----------------------------------------------- */

.slide-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-background);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

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

.slide-card__link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.slide-card__thumb-wrap {
  position: relative;
  background: var(--color-gray-800);
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.slide-card__thumb {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.slide-card__count {
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-2);
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  font-size: 0.75rem;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}

.slide-card__body {
  padding: var(--space-4);
}

.slide-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  margin: 0 0 var(--space-1) 0;
  line-height: 1.4;
  color: var(--color-text-primary);
}

.slide-card__conference {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.slide-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.slide-card__date,
.slide-card__location {
  white-space: nowrap;
}

.slide-card__location::before {
  content: "\00b7";
  margin-right: var(--space-2);
}

/* -----------------------------------------------
   Single Presentation Page
   ----------------------------------------------- */

.slides-single {
  max-width: 900px;
  margin: 0 auto;
}

.slides-single__header {
  margin-bottom: var(--space-8);
}

.slides-single__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 var(--space-3) 0;
  line-height: 1.3;
}

.slides-single__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.slides-single__meta > span + span::before,
.slides-single__meta > time + span::before,
.slides-single__meta > span + time::before {
  content: "\00b7";
  margin-right: var(--space-2);
}

.slides-single__conference a {
  color: var(--color-primary);
  text-decoration: none;
}

.slides-single__conference a:hover {
  text-decoration: underline;
}

/* Slide Viewer Placeholder (replaced in Phase 2) */
.slides-single__viewer {
  margin-bottom: var(--space-8);
}

.slide-viewer-placeholder {
  background: var(--color-gray-800);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-align: center;
}

.slide-viewer-placeholder__img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
}

.slide-viewer-placeholder__info {
  color: var(--color-gray-400);
  font-size: 0.8125rem;
  padding: var(--space-2) 0;
  margin: 0;
}

/* Download */
.slides-single__download {
  margin-bottom: var(--space-8);
}

.slides-single__download-btn {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.slides-single__download-btn:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* External link */
.slides-single__external {
  margin-bottom: var(--space-8);
}

.slides-single__external a {
  color: var(--color-primary);
}

/* Sections */
.slides-single__abstract,
.slides-single__videos,
.slides-single__resources,
.slides-single__whitepaper,
.slides-single__related,
.slides-single__crossrefs,
.slides-single__embed-code {
  margin-bottom: var(--space-8);
}

.slides-single__abstract h2,
.slides-single__videos h2,
.slides-single__resources h2,
.slides-single__whitepaper h2,
.slides-single__related h2,
.slides-single__crossrefs h2,
.slides-single__embed-code h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.slides-single__abstract-body {
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Video items */
.slides-single__video-item {
  margin-bottom: var(--space-6);
}

.slides-single__video-item h3 {
  font-size: 1rem;
  margin-bottom: var(--space-3);
  color: var(--color-text-secondary);
}

/* Resources list */
.slides-single__resources-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.slides-single__resources-list li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.slides-single__resources-list a {
  color: var(--color-primary);
  text-decoration: none;
}

.slides-single__resources-list a:hover {
  text-decoration: underline;
}

/* Whitepaper card */
.whitepaper-card {
  padding: var(--space-6);
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.whitepaper-card h3 {
  margin: 0 0 var(--space-2) 0;
  font-size: 1.0625rem;
}

.whitepaper-card p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.whitepaper-card__authors {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.whitepaper-card__download {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-family-mono);
  font-size: 0.875rem;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  text-decoration: none;
}

.whitepaper-card__download:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Cross-references */
.slides-single__crossrefs ul {
  list-style: none;
  padding: 0;
}

.slides-single__crossrefs li {
  padding: var(--space-2) 0;
}

.slides-single__crossrefs a {
  color: var(--color-primary);
  text-decoration: none;
}

.slides-single__crossrefs a:hover {
  text-decoration: underline;
}

/* Tags */
.slides-single__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.slides-single__tag {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  background: var(--color-background-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.slides-single__tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Social Chatter */
.social-chatter {
  margin-bottom: var(--space-8);
}

.social-chatter h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
}

.social-chatter__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.social-chatter__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.social-chatter__placeholder {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  background: var(--color-background-alt);
}

.social-chatter__info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.social-chatter__platform {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-primary);
}

.social-chatter__handle {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.social-chatter__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.social-chatter__load {
  font-family: var(--font-family-mono);
  font-size: 0.8125rem;
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s ease;
}

.social-chatter__load:hover {
  background: var(--color-primary-dark);
}

.social-chatter__link {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.social-chatter__link:hover {
  color: var(--color-primary);
}

.social-chatter__embed {
  padding: var(--space-4);
}

.social-chatter__iframe {
  width: 100%;
  min-height: 300px;
  border: none;
  border-radius: var(--radius-md);
}

/* Embed code snippets */
.embed-snippets {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.embed-snippet__label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.embed-snippet__input {
  width: 100%;
  font-family: var(--font-family-mono);
  font-size: 0.8125rem;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-background-alt);
  color: var(--color-text-primary);
  cursor: text;
}

.embed-snippet__input:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: -1px;
}

/* -----------------------------------------------
   Dark Mode Overrides
   ----------------------------------------------- */

@media (prefers-color-scheme: dark) {
  .slide-card {
    border-color: var(--color-border);
    background: var(--color-background-alt);
  }

  .slide-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    border-color: transparent;
  }

  .slides-filters {
    background: var(--color-background-alt);
    border-color: var(--color-border);
  }

  .slides-filters__select {
    background: var(--color-background);
    border-color: var(--color-border);
    color: var(--color-text-primary);
  }

  .slide-viewer-placeholder {
    background: #000;
  }

  .whitepaper-card {
    background: var(--color-background-alt);
    border-color: var(--color-border);
  }
}

/* -----------------------------------------------
   Responsive
   ----------------------------------------------- */

@media (max-width: 640px) {
  .slides-grid {
    grid-template-columns: 1fr;
  }

  .slides-single__title {
    font-size: 1.375rem;
  }

  .slides-single__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .slides-single__meta > span + span::before,
  .slides-single__meta > time + span::before,
  .slides-single__meta > span + time::before {
    content: none;
    margin: 0;
  }

  .slides-filters {
    flex-direction: column;
    align-items: flex-start;
  }

  .slides-filters__count {
    margin-left: 0;
  }
}

/* -----------------------------------------------
   Print Styles
   ----------------------------------------------- */

@media print {
  .slide-viewer__toolbar,
  .slide-viewer__prev,
  .slide-viewer__next,
  .slide-viewer__grid,
  .slides-filters,
  .social-chatter__load,
  .slides-single__embed-code,
  .talks-map {
    display: none !important;
  }

  .slide-viewer {
    background: #fff;
    page-break-inside: avoid;
  }

  .slide-viewer__slide {
    display: block !important;
    page-break-after: always;
    margin-bottom: 1rem;
  }

  .slide-viewer__img {
    max-height: none;
    max-width: 100%;
  }

  .slide-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* -----------------------------------------------
   Accessibility — Focus States
   ----------------------------------------------- */

.slide-viewer__grid-btn:focus-visible,
.slide-viewer__fs-btn:focus-visible,
.slide-viewer__download-btn:focus-visible,
.slide-viewer__prev:focus-visible,
.slide-viewer__next:focus-visible,
.slide-viewer__grid-item:focus-visible,
.slide-card__link:focus-visible,
.social-chatter__load:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Skip link target for keyboard users */
.slide-viewer:focus {
  outline: none;
}

.slide-viewer:focus-visible {
  box-shadow: 0 0 0 3px var(--color-primary);
}