/* ==========================================================================
   DXF & IFC Viewer Styles
   ========================================================================== */

.viewer-tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
}

.viewer-tab {
    padding: 10px 24px;
    font-family: var(--font);
    font-size: 14px;
    font-weight: 500;
    border: 2px solid var(--gray-200);
    border-radius: 6px;
    background: var(--white);
    color: var(--gray-600);
    cursor: pointer;
    transition: all var(--transition);
}

.viewer-tab:hover {
    border-color: var(--light-blue);
    color: var(--dark-blue);
}

.viewer-tab.active {
    background: var(--dark-blue);
    border-color: var(--dark-blue);
    color: var(--white);
}

.viewer-panels { position: relative; }

.viewer-panel { display: none; }
.viewer-panel.active { display: block; }

.viewer-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    justify-content: center;
}

.viewer-file-btn,
.viewer-view-btn {
    padding: 6px 16px;
    font-family: var(--font);
    font-size: 13px;
    font-weight: 400;
    border: 1px solid var(--gray-200);
    border-radius: 4px;
    background: var(--white);
    color: var(--gray-600);
    cursor: pointer;
    transition: all var(--transition);
}

.viewer-file-btn:hover,
.viewer-view-btn:hover {
    border-color: var(--light-blue);
    color: var(--dark-blue);
}

.viewer-file-btn.active,
.viewer-view-btn.active {
    background: var(--light-blue);
    border-color: var(--light-blue);
    color: var(--white);
}

.viewer-canvas-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    max-height: 500px;
    border: 2px solid var(--dark-blue);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #0a1a24;
}

.viewer-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.viewer-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #0a1a24;
    z-index: 10;
    transition: opacity 0.3s ease;
}

.viewer-loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.viewer-loading p {
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    margin-top: 16px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(43,171,227,0.2);
    border-top-color: var(--light-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Progress bar for IFC loading */
.viewer-progress {
    width: 200px;
    height: 4px;
    background: rgba(43,171,227,0.15);
    border-radius: 2px;
    margin-top: 16px;
    overflow: hidden;
}

.viewer-progress-bar {
    height: 100%;
    background: var(--light-blue);
    border-radius: 2px;
    width: 0%;
    transition: width 0.2s ease;
}

.viewer-progress-bar.indeterminate {
    width: 40%;
    animation: indeterminate 1.2s ease-in-out infinite;
}

@keyframes indeterminate {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

.viewer-loading .loading-step {
    font-size: 12px;
    color: rgba(255,255,255,0.35);
    margin-top: 8px;
}

.viewer-hint {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: rgba(255,255,255,0.35);
    pointer-events: none;
    white-space: nowrap;
}

/* Layer panel (overlaid on DXF viewer) */
.layer-panel {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(10, 26, 36, 0.92);
    border: 1px solid rgba(43, 171, 227, 0.25);
    border-radius: 6px;
    z-index: 20;
    max-height: 70%;
    display: flex;
    flex-direction: column;
    min-width: 160px;
    max-width: 220px;
    backdrop-filter: blur(8px);
}

.layer-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-size: 11px;
    font-weight: 600;
    color: rgba(255,255,255,0.7);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.layer-toggle-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.5);
    cursor: pointer;
    font-size: 14px;
    padding: 2px 4px;
    border-radius: 3px;
}
.layer-toggle-btn:hover {
    color: rgba(255,255,255,0.9);
    background: rgba(255,255,255,0.1);
}

.layer-panel-list {
    overflow-y: auto;
    padding: 4px 0;
}

.layer-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 10px;
    cursor: pointer;
    font-size: 11px;
    color: rgba(255,255,255,0.65);
    transition: background 0.15s;
}
.layer-row:hover {
    background: rgba(255,255,255,0.06);
}

.layer-row input[type="checkbox"] {
    width: 13px;
    height: 13px;
    margin: 0;
    accent-color: var(--light-blue);
    cursor: pointer;
    flex-shrink: 0;
}

.layer-swatch {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

.layer-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Viewer description (SEO/GEO text below canvas) */
.viewer-description {
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.6;
    margin-top: 12px;
    text-align: center;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* WebGL fallback */
.viewer-fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: rgba(255,255,255,0.5);
    font-size: 14px;
    text-align: center;
    padding: 24px;
}

@media (max-width: 768px) {
    .viewer-canvas-wrap {
        aspect-ratio: 4 / 3;
    }
}