#main_bg {
    background-image: url(../assets/images/background/miku_4.webp);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    position: fixed;
    min-height: 100vh;
    width: 100%;
    z-index: -1;
}

#panel {
    font-family: var(--app-font-serif);
    backdrop-filter: blur(2px);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Header */
.pbr-head {
    background: linear-gradient(135deg, var(--app-glass-strong), var(--app-glass));
    border: 1px solid var(--app-line);
    border-radius: 14px;
    padding: 8px 14px;
    margin-bottom: 6px;
    box-shadow: 0 6px 16px var(--app-accent-hover);
    flex-shrink: 0;
}
.pbr-head h1 { font-size: 18px; color: var(--app-text-heading); margin-bottom: 2px; letter-spacing: .4px; }
.pbr-head p { font-size: 12px; color: var(--app-text); margin: 0; }

/* Main Layout */
.pbr-layout {
    display: grid;
    grid-template-columns: 380px minmax(0, 1fr);
    gap: 8px;
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

.pbr-left, .pbr-right {
    width: 100%;
    min-height: 0;
    min-width: 0;
    background: var(--app-glass);
    border: 1px solid var(--app-line);
    border-radius: 14px;
    padding: 8px;
    box-shadow: 0 8px 20px var(--app-shadow-card);
    overflow: hidden;
    box-sizing: border-box;
}
.pbr-left {
    display: flex;
    flex-direction: column;
    gap: 6px;
    overflow-y: auto;
}
.pbr-right {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* Sections */
.pbr-section {
    background: linear-gradient(180deg, var(--app-glass-strong), var(--app-glass));
    border: 1px solid var(--app-line);
    border-radius: 11px;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.pbr-section-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--app-text);
}
.pbr-hint {
    font-size: 11px;
    color: var(--app-muted);
    margin: 0;
}

/* Mode Toggle */
.mode-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}
.mode-btn {
    border: 1px solid var(--app-line);
    border-radius: 9px;
    padding: 7px 10px;
    background: var(--app-surface-input);
    font-size: 12px;
    cursor: pointer;
    transition: all .18s;
    color: var(--app-text);
}
.mode-btn.active {
    background: linear-gradient(135deg, var(--app-accent-light), var(--app-accent-strong));
    color: #fff;
    border-color: transparent;
    font-weight: 600;
}
.mode-btn:hover:not(.active) {
    border-color: var(--app-line-strong);
}

.status-bar {
    font-size: 11px;
    color: var(--app-text);
    padding: 4px 8px;
    background: var(--app-glass);
    border-radius: 6px;
    border: 1px solid var(--app-accent-hover);
}

/* Dropzone */
.pbr-dropzone {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    border: 2px dashed var(--app-line-strong);
    border-radius: 12px;
    background: var(--app-overlay-dark);
    cursor: pointer;
    overflow: hidden;
    transition: border-color .2s, box-shadow .2s;
}
.pbr-dropzone:hover, .pbr-dropzone.dragover {
    border-color: var(--app-accent-light);
    box-shadow: 0 0 0 3px var(--app-accent-pressed) inset;
}
.pbr-dropzone-sm { min-height: 70px; }
.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    z-index: 1;
}
.dropzone-content span {
    font-size: 12px;
    color: var(--app-text-inverse);
    padding: 3px 8px;
    border-radius: 999px;
    background: rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.15);
}
.dropzone-content small {
    font-size: 10px;
    color: var(--app-text-inverse-muted);
}
.dropzone-preview {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: none;
}
.pbr-dropzone.has-image .dropzone-content { opacity: 0.15; }
.pbr-dropzone.has-image .dropzone-preview { display: block; }

/* Sample Row */
.sample-row {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.sample-btn {
    border: 1px solid var(--app-line);
    border-radius: 8px;
    padding: 4px 10px;
    background: var(--app-card-hover);
    font-size: 11px;
    cursor: pointer;
    color: var(--app-text);
    transition: all .18s;
}
.sample-btn:hover {
    background: linear-gradient(135deg, rgba(55,177,140,0.15), rgba(20,122,99,0.1));
    border-color: var(--app-line-strong);
}

/* Control Rows */
.ctrl-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--app-text);
}
.ctrl-row label {
    flex-shrink: 0;
    min-width: 70px;
    font-size: 12px;
    color: var(--app-text);
    display: inline;
}
.ctrl-row input[type="range"] {
    flex: 1;
    min-width: 0;
    border: none;
    padding: 0;
    background: transparent;
}
.ctrl-row select {
    flex: 1;
    min-width: 0;
    border: 1px solid var(--app-line);
    border-radius: 9px;
    padding: 6px 8px;
    background: var(--app-surface-input);
    font-size: 12px;
}
.val-badge {
    flex-shrink: 0;
    min-width: 40px;
    text-align: center;
    font-size: 11px;
    padding: 3px 6px;
    border: 1px solid var(--app-line);
    border-radius: 6px;
    background: var(--app-glass-strong);
    color: var(--app-text);
}
.ctrl-labels {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--app-muted);
    padding: 0 78px 0 78px;
}

/* Checkboxes */
.check-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.check-label {
    display: flex !important;
    flex-direction: row !important;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--app-text);
    cursor: pointer;
}
.check-label input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--app-accent);
}

/* Buttons */
.btn-primary {
    border: none;
    background: linear-gradient(135deg, var(--app-accent-light), var(--app-accent-strong));
    color: #fff;
    cursor: pointer;
    padding: 8px 14px;
    font-weight: 600;
    border-radius: 9px;
    font-size: 12px;
    transition: transform .18s, box-shadow .18s;
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(20,122,99,0.28);
}
.btn-secondary {
    border: 1px solid var(--app-line);
    border-radius: 9px;
    padding: 6px 12px;
    background: var(--app-surface-input);
    font-size: 12px;
    cursor: pointer;
    color: var(--app-text);
    transition: all .18s;
}
.btn-secondary:hover {
    border-color: var(--app-line-strong);
    background: var(--app-card-hover);
}

/* Tabs */
.pbr-tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}
.tab-btn {
    border: 1px solid var(--app-line);
    border-radius: 9px;
    padding: 6px 14px;
    background: var(--app-surface-input);
    font-size: 12px;
    cursor: pointer;
    color: var(--app-text);
    transition: all .18s;
}
.tab-btn.active {
    background: linear-gradient(135deg, var(--app-accent-light), var(--app-accent-strong));
    color: #fff;
    border-color: transparent;
    font-weight: 600;
}
.tab-spacer { flex: 1; }
.size-btn {
    border: 1px solid var(--app-line);
    border-radius: 7px;
    padding: 4px 10px;
    background: var(--app-card-hover);
    font-size: 11px;
    cursor: pointer;
    color: var(--app-text);
    transition: all .18s;
}
.size-btn.active {
    background: var(--app-accent-hover);
    border-color: var(--app-line-strong);
    color: var(--app-text-heading);
    font-weight: 600;
}

/* Map Grid */
.pbr-map-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}
.pbr-map-grid.large-preview {
    grid-template-columns: repeat(2, 1fr);
}
.pbr-map-card {
    background: linear-gradient(180deg, var(--app-glass-strong), var(--app-glass));
    border: 1px solid var(--app-line);
    border-radius: 10px;
    padding: 6px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-height: 0;
}
.map-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}
.map-header h4 {
    font-size: 12px;
    color: var(--app-text);
    font-weight: 600;
    margin: 0;
}
.btn-dl {
    border: 1px solid var(--app-line);
    border-radius: 7px;
    padding: 2px 8px;
    background: var(--app-card-hover);
    font-size: 10px;
    cursor: pointer;
    color: var(--app-text);
    transition: all .18s;
}
.btn-dl:hover {
    background: linear-gradient(135deg, rgba(55,177,140,0.15), rgba(20,122,99,0.1));
    border-color: var(--app-line-strong);
}
.pbr-map-card canvas {
    flex: 1;
    min-height: 0;
    width: 100%;
    display: block;
    object-fit: contain;
    background: var(--app-overlay-dark);
    border-radius: 7px;
    border: 1px solid var(--app-line-subtle);
}

/* 3D Preview */
.pbr-3d-wrap {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: linear-gradient(180deg, var(--app-glass-strong), var(--app-glass));
    border: 1px solid var(--app-line);
    border-radius: 12px;
    padding: 8px;
    overflow: hidden;
}
.pbr-3d-wrap canvas {
    flex: 1;
    min-height: 0;
    width: 100%;
    display: block;
    border-radius: 8px;
    border: 1px solid var(--app-line-subtle);
    background: var(--app-overlay-dark);
}
.pbr-3d-hint {
    font-size: 10px;
    color: var(--app-muted);
    text-align: center;
    flex-shrink: 0;
}
.pbr-3d-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    font-size: 12px;
    color: var(--app-text);
}
.pbr-3d-controls label {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 6px;
    font-size: 12px;
}
.pbr-3d-controls select, .pbr-3d-controls input[type="range"] {
    border: 1px solid var(--app-line);
    border-radius: 7px;
    padding: 4px 8px;
    background: var(--app-surface-input);
    font-size: 11px;
}
.pbr-3d-controls input[type="range"] {
    border: none;
    padding: 0;
    background: transparent;
    width: 100px;
}

/* Reference Table */
.pbr-ref-table {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.ref-item {
    font-size: 11px;
    color: var(--app-text);
    padding: 2px 0;
}
.ref-item b {
    color: var(--app-text-heading);
}

/* Reverse Result */
#reverseResult {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid var(--app-line-subtle);
    background: var(--app-overlay-dark);
}

/* Responsive */
@media (max-width: 1280px) {
    .pbr-layout { grid-template-columns: 1fr; }
    .pbr-right { max-height: 60vh; }
}
@media (max-width: 900px) {
    .pbr-map-grid { grid-template-columns: repeat(2, 1fr); }
    .pbr-map-grid.large-preview { grid-template-columns: 1fr; }
}