/* ============================================================
   PORTFOLIO.CSS -- Portfolio Section Styles
   ============================================================ */

/* ------------------------------------------------------------
   1. Page Hero (shared inner-page hero)
   ------------------------------------------------------------ */
.page-hero {
  position: relative;
  padding: calc(var(--header-height) + 60px) 0 60px;
  background: var(--color-gray-900);
  text-align: center;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(50, 150, 255, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(0, 49, 116, 0.08) 0%, transparent 50%);
  z-index: 0;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 16px;
}

.page-hero p {
  color: var(--color-gray-400);
  max-width: 600px;
  margin: 0 auto;
  font-size: 18px;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  margin-bottom: 24px;
  font-family: var(--font-nav);
  font-size: var(--fs-small);
}

.breadcrumb a {
  color: var(--color-gray-500);
  transition: color var(--transition-speed);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb .breadcrumb__sep {
  color: var(--color-gray-500);
}

.breadcrumb .breadcrumb__current {
  color: var(--color-gray-300);
}

/* ------------------------------------------------------------
   2. Filter Bar
   ------------------------------------------------------------ */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.filter-btn {
  font-family: var(--font-nav);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 20px;
  border-radius: 24px;
  border: 1px solid var(--color-gray-700);
  background: transparent;
  color: var(--color-gray-400);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.is-active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: var(--color-white);
}

/* ------------------------------------------------------------
   3. Portfolio Grid
   ------------------------------------------------------------ */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap-desktop);
}

.portfolio-card {
  opacity: 1;
  transform: scale(1);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.portfolio-card.is-hidden {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
  position: absolute;
  visibility: hidden;
}

.portfolio-card .card__image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
}

.portfolio-card .card__text {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Card image styles */
.portfolio-card .card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.portfolio-card .card__image .placeholder-image {
  transition: transform 0.4s ease;
}

/* Gradient overlay on card images */
.card__image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 40%,
    rgba(26, 32, 44, 0.6) 100%
  );
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 1;
}

/* Card hover: zoom image + show overlay */
.portfolio-card:hover .card__image img {
  transform: scale(1.08);
}

.portfolio-card:hover .card__image .placeholder-image {
  transform: scale(1.05);
}

.portfolio-card:hover .card__image-overlay {
  opacity: 1;
}

/* Empty state */
.portfolio-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--color-gray-500);
  font-size: 18px;
}

/* Loading state */
.portfolio-loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 80px 20px;
  color: var(--color-gray-500);
}

.portfolio-loading__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-gray-700);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

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

/* ------------------------------------------------------------
   4. Project Detail -- Hero
   ------------------------------------------------------------ */
.project-hero {
  position: relative;
  padding: calc(var(--header-height) + 40px) 0 40px;
  background: var(--color-gray-900);
}

.project-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0.08;
}

.project-hero .container {
  position: relative;
  z-index: 1;
}

.project-hero__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.project-hero__date {
  font-family: var(--font-nav);
  font-size: var(--fs-small);
  color: var(--color-gray-500);
}

.project-hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 16px;
}

.project-hero__description {
  color: var(--color-gray-300);
  font-size: 18px;
  max-width: 720px;
  line-height: 1.7;
}

/* Hero image banner */
.project-hero__banner {
  margin-top: 32px;
  border-radius: var(--card-radius);
  overflow: hidden;
  aspect-ratio: 21 / 9;
}

.project-hero__banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.project-hero__banner .placeholder-image {
  width: 100%;
  height: 100%;
  min-height: 200px;
}

/* ------------------------------------------------------------
   5. Challenge / Solution / Result
   ------------------------------------------------------------ */
.project-csr {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap-desktop);
}

.project-csr__item {
  background: var(--color-gray-900);
  border: 1px solid var(--color-gray-700);
  border-radius: var(--card-radius);
  padding: 32px 24px;
}

.project-csr__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  margin-bottom: 16px;
}

.project-csr__icon--challenge {
  background: rgba(252, 129, 129, 0.1);
  color: var(--color-error);
}

.project-csr__icon--solution {
  background: rgba(50, 150, 255, 0.1);
  color: var(--color-primary);
}

.project-csr__icon--result {
  background: rgba(72, 187, 120, 0.1);
  color: var(--color-success);
}

.project-csr__icon svg {
  width: 24px;
  height: 24px;
}

.project-csr__item h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.project-csr__item p {
  color: var(--color-gray-300);
  font-size: 15px;
  line-height: 1.7;
}

/* ------------------------------------------------------------
   6. Technology Tags
   ------------------------------------------------------------ */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-tag {
  display: inline-block;
  font-family: var(--font-nav);
  font-size: var(--fs-small);
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--color-gray-700);
  color: var(--color-gray-300);
  background: var(--color-gray-900);
  transition: all var(--transition-speed);
}

.tech-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* ------------------------------------------------------------
   7. Image Gallery
   ------------------------------------------------------------ */
.project-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.gallery-item {
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4 / 3;
  transition: transform var(--transition-speed);
}

.gallery-item:hover {
  transform: scale(1.02);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease, filter 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.06);
  filter: brightness(1.1);
}

.gallery-item .placeholder-image {
  width: 100%;
  height: 100%;
  border-radius: 0;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 85vh;
}

.lightbox__image {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--card-radius);
  object-fit: contain;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox__content .placeholder-image {
  width: 70vw;
  height: 60vh;
  max-width: 900px;
  border-radius: var(--card-radius);
  font-size: 18px;
}

.lightbox__close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  cursor: pointer;
  transition: background var(--transition-speed);
  z-index: 2001;
  border: none;
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox__close svg {
  width: 24px;
  height: 24px;
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  cursor: pointer;
  transition: background var(--transition-speed);
  border: none;
}

.lightbox__nav:hover {
  background: rgba(255, 255, 255, 0.2);
}

.lightbox__nav svg {
  width: 20px;
  height: 20px;
}

.lightbox__prev {
  left: 20px;
}

.lightbox__next {
  right: 20px;
}

.lightbox__counter {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-nav);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

/* ------------------------------------------------------------
   8. Related Projects
   ------------------------------------------------------------ */
.related-projects h2 {
  margin-bottom: 32px;
}

/* ------------------------------------------------------------
   9. Back Link
   ------------------------------------------------------------ */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-nav);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-gray-400);
  transition: color var(--transition-speed);
  margin-bottom: 24px;
}

.back-link:hover {
  color: var(--color-primary);
}

.back-link svg {
  width: 16px;
  height: 16px;
}

/* ------------------------------------------------------------
   10. Client Info
   ------------------------------------------------------------ */
.project-info {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.project-info__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.project-info__label {
  font-family: var(--font-nav);
  font-size: var(--fs-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-gray-500);
}

.project-info__value {
  color: var(--color-white);
  font-size: 16px;
}

/* ------------------------------------------------------------
   Responsive -- Portfolio Specific
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-csr {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .page-hero {
    padding: calc(var(--header-height) + 40px) 0 40px;
  }

  .filter-bar {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 8px;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .filter-bar::-webkit-scrollbar {
    display: none;
  }

  .portfolio-grid {
    grid-template-columns: 1fr;
  }

  .project-hero__banner {
    aspect-ratio: 16 / 9;
  }

  .project-csr {
    grid-template-columns: 1fr;
  }

  .project-gallery {
    grid-template-columns: repeat(2, 1fr);
  }

  .lightbox__image {
    max-width: 95vw;
    max-height: 75vh;
  }

  .lightbox__content .placeholder-image {
    width: 90vw;
    height: 50vh;
  }

  .lightbox__prev { left: 8px; }
  .lightbox__next { right: 8px; }

  .project-info {
    gap: 20px;
  }
}

@media (max-width: 479px) {
  .project-gallery {
    grid-template-columns: 1fr;
  }
}