/* === Project Detail Page === */

/* Project hero banner */
.project-hero {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 1;
  max-height: 175px;
  overflow: hidden;
  background-color: var(--color-bg-secondary);
}

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

.project-hero__overlay {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-xl);
  background: rgba(10, 10, 10, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-hero__title {
  width: 100%;
  max-width: calc(var(--content-max-width) + 240px);
  font-size: 2.4rem;
  font-weight: 700;
  text-align: center;
  color: var(--color-text-primary);
  -webkit-text-stroke: 2px var(--color-accent);
  paint-order: stroke fill;
  text-shadow:
    0 2px 12px rgba(0, 0, 0, 0.8),
    0 0 20px rgba(74, 158, 255, 0.3);
  margin: 0;
}

/* Metadata bar — full-width background, centered content */
.project-meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-xl);
  max-width: calc(var(--content-max-width) + 240px);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-xl);
}

.project-meta::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 100vw;
  transform: translateX(-50%);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  z-index: -1;
}

.project-meta__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.project-meta__label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.project-meta__value {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

/* Layout with TOC sidebar */
.project-layout {
  display: grid;
  grid-template-columns: 1fr;
  max-width: calc(var(--content-max-width) + 240px);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  gap: var(--space-2xl);
}

/* Table of contents */
.project-toc {
  display: none;
}

.project-toc__nav {
  position: sticky;
  top: calc(var(--navbar-height) + var(--space-xl));
}

.project-toc__title {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.project-toc__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-md);
}

.project-toc__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  padding: var(--space-xs) 0;
}

.project-toc__link:hover,
.project-toc__link.is-active {
  color: var(--color-accent);
}

.project-toc__link.is-active {
  border-left: 2px solid var(--color-accent);
  margin-left: calc(-1 * var(--space-md) - 1px);
  padding-left: var(--space-md);
}

/* Mobile TOC (collapsible at top of content) */
.project-toc-mobile {
  margin-bottom: var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.project-toc-mobile__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border: none;
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
}

.project-toc-mobile__toggle svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  transition: transform var(--transition-fast);
}

.project-toc-mobile__toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.project-toc-mobile__list {
  display: none;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: var(--color-bg-secondary);
}

.project-toc-mobile__list.is-open {
  display: flex;
}

.project-toc-mobile__link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  padding: var(--space-xs) 0;
}

.project-toc-mobile__link:hover {
  color: var(--color-accent);
}

/* Project content area */
.project-content {
  min-width: 0; /* prevent grid blowout */
}

.project-content h2 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  scroll-margin-top: calc(var(--navbar-height) + var(--space-xl));
}

.project-content h2:first-child {
  margin-top: 0;
}

.project-content p {
  margin-bottom: var(--space-md);
}

.project-content img,
.project-content video {
  width: 100%;
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.project-content img:hover {
  opacity: 0.9;
}

/* Two-column image layout */
.project-content .image-pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.project-content .image-pair img {
  margin: 0;
}

/* Previous / Next navigation */
.project-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-2xl);
}

.project-nav__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  flex: 1;
  max-width: 50%;
}

.project-nav__link:hover {
  border-color: var(--color-accent);
  background-color: var(--color-bg-secondary);
}

.project-nav__link--next {
  text-align: right;
  margin-left: auto;
}

.project-nav__label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.project-nav__title {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-primary);
}

/* Desktop: show sidebar TOC, hide mobile TOC */
@media (min-width: 1024px) {
  .project-layout {
    grid-template-columns: 200px 1fr;
  }

  .project-toc {
    display: block;
  }

  .project-toc-mobile {
    display: none;
  }

  .project-content .image-pair {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .project-hero__title {
    font-size: var(--text-4xl);
  }
}