/**
 * Frontend Styles for Algo Video Carousel
 *
 * Includes styles for:
 * - Carousel layout and slides
 * - Video elements and overlays
 * - Navigation controls and dots
 * - LAZY LOADING (v1.1.0): Loading states and lazy-video visibility
 */

/* ==========================================================================
   Carousel container and slides
   ========================================================================== */

.algo-video-carousel {
  position: relative;
  width: 100%;
  height: 100vh; /* Default height, can be overridden by settings */
  overflow: hidden;
}

.carousel-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease-in-out;
  z-index: 1;
  will-change: opacity;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.carousel-slide.active {
  opacity: 1;
  z-index: 2;
}

/* Video element - base styles (first slide has src; others get .lazy-video) */
.carousel-video {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: 100%;
  height: 100%;
  transform: translate(-50%, -50%);
  object-fit: cover;
  will-change: transform;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
}

.video-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #000; /* Default color, overridden by settings */
  opacity: 0.5; /* Default opacity, overridden by settings */
  z-index: 2;
}

/* Navigation Controls */
.carousel-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 20px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
  background: #000000;
  opacity: 0.4;
}

.carousel-nav:hover {
  opacity: 1;
}

.carousel-nav.prev {
  left: 20px;
}

.carousel-nav.next {
  right: 20px;
}

/* Navigation Dots */
.carousel-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  align-items: center;
  z-index: 6;
}

/* Tap-to-play: avoid confusing nav until video has started */
.algo-video-carousel.playback-pending-interaction .carousel-nav,
.algo-video-carousel.playback-pending-interaction .carousel-dots {
  pointer-events: none;
  opacity: 0.35;
}

/* Play overlay (poster / interaction mode) */
.algo-carousel-play-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.algo-carousel-play-overlay .algo-carousel-play-btn {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.85rem 1.35rem;
  border: none;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.2s ease;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.algo-carousel-play-overlay .algo-carousel-play-btn:hover {
  background: rgba(0, 0, 0, 0.72);
  transform: scale(1.03);
}

.algo-carousel-play-overlay .algo-carousel-play-btn:focus {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.algo-carousel-play-icon {
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0.55em 0 0.55em 0.9em;
  border-color: transparent transparent transparent #fff;
  margin-left: 0.15em;
}

.algo-carousel-play-overlay.is-dismissed {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0.35s ease;
}

/* Touch target 48x48px (WCAG 2.5.5); visual dot 12px via ::before */
.dot {
  width: 48px;
  height: 48px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  flex-shrink: 0;
}

.dot::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  border: 2px solid rgba(255, 255, 255, 0.5);
  transition: all 0.3s ease;
}

.dot:hover::before {
  background: rgba(255, 255, 255, 0.5);
}

.dot.active::before {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(255, 255, 255, 0.9);
}

/* Responsive Design */
@media screen and (max-width: 768px) {
  .carousel-nav {
    width: 30px;
    height: 30px;
    font-size: 16px;
  }

  .carousel-nav.prev {
    left: 10px;
  }

  .carousel-nav.next {
    right: 10px;
  }

  .dot::before {
    width: 10px;
    height: 10px;
    margin: -5px 0 0 -5px;
  }
}

/* ==========================================================================
   LAZY LOADING - Performance optimization (v1.1.0)
   Styles for on-demand video loading; only the first video loads on page load.
   ========================================================================== */

/* Loading State - Carousel level (legacy / fallback) */
.algo-video-carousel.loading::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s linear infinite;
  z-index: 4;
}

/* Loading State - Individual slide: spinner shown while lazy video loads */
.carousel-slide.loading {
  background-color: #1a1a1a;
}

.carousel-slide.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 30px;
  height: 30px;
  margin: -15px 0 0 -15px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
  z-index: 5;
}

/* Lazy video: hidden until JS sets data-loaded="true" after load */
.carousel-video.lazy-video {
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

/* Lazy video visible once loaded (data-loaded set by frontend.js) */
.carousel-video.lazy-video[data-loaded="true"] {
  opacity: 1;
}

/* ==========================================================================
   Spinner animation (used by loading states above)
   ========================================================================== */

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.text-container {
  position: absolute;
  left: 50%;
  top: 55%;
  transform: translate(-50%, -50%);
  z-index: 10;
  /* background: rgba(0, 0, 0, 0.1); */
  color: #fff;
  padding: 1rem 2rem;
  border-radius: 8px;
  max-width: 90vw;
  text-align: center;
  /* box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15); */
  word-break: break-word;
}

@media screen and (max-width: 768px) {
  .text-container {
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
  }
}