/* Project detail page (project.html). Mobile-first; breakpoints at 640px, 960px. */

.project-page {
  padding-block: var(--space-6) var(--space-8);
}

.project-loading {
  padding-block: var(--space-8);
  color: var(--color-text-muted);
  text-align: center;
}

.project-back {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap-min);
  margin-bottom: var(--space-4);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-decoration: none;
}

.project-back:hover {
  text-decoration: underline;
}

/* ---------- Head: category, title, date, description, features ---------- */
.project-head {
  display: grid;
  gap: var(--space-3);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.project-head__category {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  text-decoration: none;
}

.project-head__category:hover {
  background: var(--color-accent);
  color: #fff;
}

.project-head__title {
  margin: 0;
}

.project-head__meta {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.project-head__text {
  max-width: 68ch;
  margin: 0;
  font-size: var(--fs-lg);
}

.project-head__features {
  display: grid;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.project-head__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--color-text-muted);
}

/* ---------- Sections ---------- */
.project-section {
  padding-top: var(--space-7);
}

.project-section__title {
  font-size: var(--fs-xl);
}

/* ---------- 3D viewer ---------- */
.viewer {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  box-shadow: var(--shadow-sm);
}

.viewer__stage {
  position: relative;
  aspect-ratio: 4 / 3;
  background: radial-gradient(ellipse at 50% 40%, #FFFFFF 0%, var(--color-surface) 70%, #E6EBF1 100%);
}

.viewer__model {
  display: block;
  width: 100%;
  height: 100%;
  --poster-color: transparent;
  background: transparent;
}

.viewer__model:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.viewer__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--color-grid);
  transition: opacity var(--dur-base) var(--ease);
}

.viewer__progress.is-done {
  opacity: 0;
}

.viewer__bar {
  display: block;
  height: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) linear;
}

.viewer__error {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--color-surface);
  text-align: center;
}

.viewer__error[hidden] {
  display: none;
}

.viewer__error img {
  max-height: 60%;
  width: auto;
  border-radius: var(--radius-sm);
  opacity: 0.85;
}

.viewer__error-text {
  margin: 0;
  font-weight: 600;
  color: var(--color-primary);
}

.viewer__toolbar {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
}

.viewer__hint {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.viewer__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.viewer__btn {
  padding-inline: var(--space-4);
  font-size: var(--fs-sm);
}

.viewer__btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Full screen: the stage fills the screen, toolbar stays at the bottom */
.viewer.is-fullscreen {
  display: flex;
  flex-direction: column;
  border-radius: 0;
}

.viewer.is-fullscreen .viewer__stage {
  flex: 1;
  aspect-ratio: auto;
}

@media (min-width: 640px) {
  .viewer__stage { aspect-ratio: 16 / 9; }

  .viewer__toolbar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

/* ---------- Image gallery ---------- */
.project-images__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 640px) {
  .project-images__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .project-images__grid { grid-template-columns: repeat(3, 1fr); }
}

.project-images__item {
  display: grid;
  gap: var(--space-2);
}

.project-images__btn {
  display: block;
  width: 100%;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  cursor: zoom-in;
  aspect-ratio: 4 / 3;
  transition: border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}

.project-images__btn:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.project-images__btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-base) var(--ease);
}

.project-images__btn:hover img {
  transform: scale(1.03);
}

.project-images__caption {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.project-images__caption:empty {
  display: none;
}

/* ---------- Previous / next ---------- */
.pager {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.pager__link {
  display: grid;
  gap: var(--space-1);
  min-height: var(--tap-min);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: inherit;
  text-decoration: none;
  transition: border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}

.pager__link:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
  color: inherit;
}

.pager__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-accent);
}

.pager__title {
  font-weight: 600;
  color: var(--color-primary);
}

.pager__spacer {
  display: none;
}

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

  .pager__spacer {
    display: block;
  }

  .pager__link--next {
    grid-column: 2;
    text-align: right;
  }
}

/* ---------- Not found / error ---------- */
.project-message {
  display: grid;
  justify-items: start;
  gap: var(--space-3);
  max-width: 560px;
  margin: var(--space-8) auto;
  padding: var(--space-6);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
}

.project-message--error {
  border-style: solid;
  border-color: #E3B6B6;
  background: #FDF6F6;
}

.project-message__title {
  margin: 0;
  font-size: var(--fs-2xl);
}

.project-message p {
  margin: 0;
  color: var(--color-text-muted);
}

/* ---------- Lightbox ---------- */
.lightbox {
  width: 100vw;
  max-width: none;
  height: 100dvh;
  max-height: none;
  margin: 0;
  padding: var(--space-8) var(--space-4) var(--space-4);
  border: 0;
  background: transparent;
  color: #fff;
}

.lightbox::backdrop {
  background: rgba(10, 22, 36, 0.92);
}

.lightbox[open] {
  display: grid;
  place-items: center;
}

.lightbox__figure {
  display: grid;
  gap: var(--space-3);
  justify-items: center;
  max-width: 100%;
  max-height: 100%;
  margin: 0;
  touch-action: pan-y;        /* horizontal swipes are handled in lightbox.js */
  user-select: none;
}

.lightbox__frame img {
  width: auto;
  max-width: min(100%, 1400px);
  max-height: calc(100dvh - 160px);
  border-radius: var(--radius-sm);
  background: #fff;
  object-fit: contain;
}

.lightbox__caption {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.85);
}

.lightbox__counter {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.6);
}

.lightbox__btn {
  position: fixed;
  display: grid;
  place-items: center;
  width: var(--tap-min);
  height: var(--tap-min);
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-sm);
  background: rgba(15, 42, 68, 0.6);
  color: #fff;
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox__btn:hover {
  background: rgba(31, 111, 178, 0.85);
}

.lightbox__btn:focus-visible {
  outline-color: #fff;
}

.lightbox__btn[hidden] {
  display: none;
}

.lightbox__close {
  top: var(--space-4);
  right: var(--space-4);
}

.lightbox__prev,
.lightbox__next {
  top: 50%;
  transform: translateY(-50%);
}

.lightbox__prev { left: var(--space-3); }
.lightbox__next { right: var(--space-3); }

/* Phones: arrows move to the bottom so they don't cover the image */
@media (max-width: 639px) {
  .lightbox__prev,
  .lightbox__next {
    top: auto;
    bottom: var(--space-4);
    transform: none;
  }

  .lightbox__prev { left: calc(50% - 52px); }
  .lightbox__next { right: calc(50% - 52px); }

  .lightbox {
    padding-bottom: calc(var(--space-8) + var(--space-4));
  }

  .lightbox__frame img {
    max-height: calc(100dvh - 220px);
  }
}