/* ============================================================
   Project: Viewer
   p-viewer — 3DGSビューワー固有のスタイル
   ============================================================ */

.p-viewer-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  min-height: 100%;
}

/* --- Stage --- */

.p-viewer-stage {
  position: relative;
  min-height: 560px;
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.28), transparent 36%),
    linear-gradient(315deg, rgba(79, 111, 143, 0.2), transparent 42%),
    var(--color-viewer-bg);
  overflow: hidden;
}

.p-viewer-stage--published {
  min-height: 100vh;
  background:
    linear-gradient(120deg, rgba(15, 118, 110, 0.18), transparent 34%),
    linear-gradient(300deg, rgba(79, 111, 143, 0.16), transparent 38%),
    var(--viewer-bg-color, #0d0f0f);
}

.p-viewer-stage--drop {
  min-height: 100vh;
}

/* グリッド背景 */
.p-viewer-stage::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.74), transparent 82%);
  pointer-events: none;
}

/* 3DGS canvas */
.p-viewer-canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
}

.p-viewer-stage--published::before {
  opacity: 0.42;
}

/* ドロップ反応 */
.p-viewer-stage--drop::after {
  position: absolute;
  z-index: 2;
  inset: var(--spacing-lg);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  content: "";
  pointer-events: none;
  transition: background 0.16s, border-color 0.16s;
}

.p-viewer-stage--drop .p-viewer-stage__content {
  z-index: 3;
  min-height: 100vh;
}

.p-viewer-stage--drop.is-dragging::after {
  border-color: rgba(255, 255, 255, 0.86);
  background: rgba(15, 118, 110, 0.14);
}

.p-viewer-stage--drop.is-dragging .c-dropzone {
  border-color: rgba(255, 255, 255, 0.98);
  background:
    linear-gradient(rgba(15, 118, 110, 0.22), rgba(255, 255, 255, 0.05)),
    rgba(16, 17, 18, 0.9);
  transform: translateY(-4px);
}

.p-viewer-stage--drop.is-dragging .c-dropzone::after {
  content: "\96E2\3059\3068\8AAD\307F\8FBC\307F\307E\3059";
  opacity: 1;
}

/* --- Stage content --- */

.p-viewer-stage__content[hidden] {
  display: none;
}

.p-viewer-stage__content {
  position: relative;
  z-index: 1;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: var(--spacing-xl);
  min-height: inherit;
  padding: var(--spacing-xl);
}

/* --- Toolbar --- */

.p-viewer-toolbar {
  position: absolute;
  z-index: 2;
  right: var(--spacing-md);
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  background: transparent;
}

.p-viewer-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.82);
}

/* --- Title overlay --- */

.p-viewer-copy {
  position: absolute;
  z-index: 2;
  top: var(--spacing-xl);
  left: var(--spacing-xl);
  width: min(100% - 48px, 460px);
  pointer-events: none;
}

.p-viewer-copy__title {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-tight);
}

/* --- Loading overlay --- */

.p-viewer-loading {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
  pointer-events: none;
}

.p-viewer-loading[hidden] {
  display: none;
}

.p-viewer-loading__ring {
  width: 56px;
  height: 56px;
  border: 3px solid rgba(255, 255, 255, 0.15);
  border-top-color: rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  animation: p-viewer-loading-spin 0.9s linear infinite;
}

.p-viewer-loading__text {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.04em;
}

.p-viewer-loading__bar-wrap {
  width: min(280px, 60%);
  height: 3px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 99px;
  overflow: hidden;
}

.p-viewer-loading__bar {
  height: 100%;
  width: 40%;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 99px;
  animation: p-viewer-loading-bar 1.4s ease-in-out infinite;
}

@keyframes p-viewer-loading-spin {
  to { transform: rotate(360deg); }
}

@keyframes p-viewer-loading-bar {
  0%   { transform: translateX(-100%); }
  50%  { transform: translateX(200%); }
  100% { transform: translateX(200%); }
}

/* --- Responsive --- */

@media (max-width: 760px) {
  .p-viewer-toolbar {
    position: static;
    border-radius: 0;
    align-items: stretch;
    flex-direction: column;
  }

  .p-viewer-stage {
    min-height: 620px;
  }

  .p-viewer-stage--published {
    min-height: 100vh;
  }

  .p-viewer-copy {
    position: relative;
    top: auto;
    left: auto;
    width: auto;
    margin: var(--spacing-md);
  }
}