/* 이미지 비교 슬라이더 전용 스타일 */

nav { max-width: 980px; }
main { max-width: 980px; }

.subtitle {
  color: var(--text-sub);
  margin-bottom: 1.25rem;
}

/* 업로드 그리드 */
.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.upload-cell {
  position: relative;
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: 12px;
  min-height: 140px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.upload-cell:hover, .upload-cell.drag-over {
  border-color: var(--primary);
  background-color: rgba(102, 126, 234, 0.04);
}

.upload-cell.has-image {
  border-style: solid;
}

.upload-cell.has-image .upload-prompt {
  display: none;
}

.cell-tag {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  z-index: 2;
}

.upload-cell:not(.has-image) .cell-tag {
  background: var(--text-sub);
  color: var(--surface);
}

.upload-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-sub);
}

.up-icon {
  font-size: 1.8rem;
}

.up-text {
  font-size: 0.85rem;
  font-weight: 600;
}

/* 컨트롤 */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.6rem 1rem;
  margin-bottom: 1rem;
}

.ctrl-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.ctrl-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-sub);
  margin-right: 0.2rem;
}

.dir-btn {
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.dir-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.chk {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.chk input {
  accent-color: var(--primary);
  cursor: pointer;
}

/* 비교 영역 */
.compare-stage {
  margin-bottom: 1.5rem;
}

.compare-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  user-select: none;
}

.compare-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.compare-clip {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.label-a, .label-b {
  position: absolute;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  pointer-events: none;
  z-index: 3;
}

.compare-frame[data-dir="horizontal"] .label-a {
  bottom: 0.85rem;
  left: 0.85rem;
}

.compare-frame[data-dir="horizontal"] .label-b {
  bottom: 0.85rem;
  right: 0.85rem;
}

.compare-frame[data-dir="vertical"] .label-a {
  top: 0.85rem;
  left: 0.85rem;
}

.compare-frame[data-dir="vertical"] .label-b {
  bottom: 0.85rem;
  left: 0.85rem;
}

.slider-handle {
  position: absolute;
  z-index: 4;
  cursor: grab;
  outline: none;
  pointer-events: auto;
}

.slider-handle:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

.handle-line {
  position: absolute;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.2);
}

.compare-frame[data-dir="horizontal"] .handle-line {
  top: -1000px;
  bottom: -1000px;
  left: -1px;
  width: 2px;
}

.compare-frame[data-dir="vertical"] .handle-line {
  left: -1000px;
  right: -1000px;
  top: -1px;
  height: 2px;
}

.handle-knob {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  border: 2px solid rgba(0, 0, 0, 0.15);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.compare-frame[data-dir="vertical"] .handle-knob {
  transform: translate(-50%, -50%) rotate(90deg);
}

.slider-handle:active {
  cursor: grabbing;
}

@media (max-width: 600px) {
  .upload-grid { grid-template-columns: 1fr; }
  .upload-cell { min-height: 100px; }
  .compare-frame { aspect-ratio: 4 / 3; }
}