/* ==========================================================================
 * Virtual Tour — バーチャル病院見学
 * ========================================================================== */

/* --- Intro --- */
.vt__intro {
  margin-block-end: var(--space-xl, 2rem);
  text-align: center;
}

.vt__lead {
  font-size: clamp(0.9375rem, 0.875rem + 0.25vw, 1.0625rem);
  color: var(--color-text-sub);
  line-height: var(--line-height-relaxed, 1.8);
}

/* --- Filter Nav --- */
.vt__filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs, 0.5rem);
  justify-content: center;
  margin-block-end: var(--space-2xl, 3rem);
  padding-block-end: var(--space-lg, 1.5rem);
  border-block-end: 1px solid var(--color-border-light);
}

.vt__filter-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs, 0.25rem);
  padding: var(--space-xs, 0.5rem) var(--space-md, 1rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill, 9999px);
  background: var(--color-surface);
  color: var(--color-text-sub);
  font-size: clamp(0.8125rem, 0.75rem + 0.25vw, 0.9375rem);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}

.vt__filter-btn .material-symbols-outlined {
  font-size: 1.125rem;
}

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

.vt__filter-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white, #fff);
}

/* --- Area Section --- */
.vt__area {
  margin-block-end: var(--space-3xl, 4rem);
}

.vt__area[hidden] {
  display: none;
}

.vt__area-title {
  display: flex;
  align-items: center;
  gap: var(--space-xs, 0.5rem);
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.5rem);
  color: var(--color-text-main);
  margin-block-end: var(--space-lg, 1.5rem);
  padding-block-end: var(--space-xs, 0.5rem);
  border-block-end: 2px solid var(--color-primary);
}

.vt__area-icon {
  color: var(--color-primary);
  font-size: 1.5rem;
}

/* --- Photo Grid --- */
.vt__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 200px), 1fr));
  gap: var(--space-md, 1rem);
}

@media (min-width: 480px) {
  .vt__grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

@media (min-width: 768px) {
  .vt__grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }
}

/* --- Photo Item --- */
.vt__item {
  margin: 0;
  border-radius: var(--radius-md, 0.5rem);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.vt__item:hover,
.vt__item:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

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

.vt__img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
}

.vt__caption {
  padding: var(--space-xs, 0.5rem) var(--space-sm, 0.75rem);
  font-size: clamp(0.75rem, 0.6875rem + 0.25vw, 0.875rem);
  color: var(--color-text-sub);
  text-align: center;
}

/* ==========================================================================
 * Lightbox
 * ========================================================================== */
.vt-lightbox {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.vt-lightbox[hidden] {
  display: none;
}

.vt-lightbox__overlay {
  position: absolute;
  inset: 0;
  background: var(--color-overlay, rgba(0, 0, 0, 0.85));
}

.vt-lightbox__content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.vt-lightbox__img {
  max-width: 90vw;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--radius-md, 0.5rem);
}

.vt-lightbox__close {
  position: absolute;
  top: -3rem;
  right: 0;
  background: none;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: var(--space-xs, 0.5rem);
  font-size: 1.5rem;
}

.vt-lightbox__close:hover {
  opacity: 0.8;
}

.vt-lightbox__prev,
.vt-lightbox__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  border: none;
  border-radius: 50%;
  color: #fff;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s;
}

.vt-lightbox__prev:hover,
.vt-lightbox__next:hover {
  background: rgba(0, 0, 0, 0.7);
}

.vt-lightbox__prev {
  left: -4rem;
}

.vt-lightbox__next {
  right: -4rem;
}

@media (max-width: 767px) {
  .vt-lightbox__prev {
    left: 0.5rem;
  }

  .vt-lightbox__next {
    right: 0.5rem;
  }

  .vt-lightbox__close {
    top: -2.5rem;
    right: 0.5rem;
  }
}

.vt-lightbox__caption {
  color: #fff;
  margin-block-start: var(--space-sm, 0.75rem);
  font-size: clamp(0.875rem, 0.8125rem + 0.25vw, 1rem);
  text-align: center;
}

.vt-lightbox__counter {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.8125rem;
  margin-block-start: var(--space-2xs, 0.25rem);
}