/* Custom LUT Preview UI styling injected into hocuongx.com */
.hidden {
    display: none !important;
}

.lut-preview-wrapper {
    margin: 40px 0;
    padding: 0;
}

/* Upload Section */
.upload-section {
    max-width: 600px;
    margin: 40px auto;
    text-align: center;
}

.upload-box {
    border: 1px dashed var(--text-muted);
    border-radius: 8px;
    padding: 80px 20px;
    background-color: var(--bg-card);
    cursor: pointer;
    transition: var(--transition);
}

.upload-box:hover, .upload-box.dragover {
    border-color: var(--accent);
    background-color: #dcdad7;
}

.upload-box svg {
    color: var(--text-secondary);
    margin-bottom: 15px;
    transition: var(--transition);
}

.upload-box:hover svg {
    color: var(--accent);
}

.upload-box h3 {
    font-family: var(--font-heading);
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.upload-box p {
    color: var(--text-secondary);
    font-size: 14px;
}

.privacy-note {
    margin-top: 24px;
    font-size: 13px;
    color: var(--text-muted);
    font-style: italic;
}

/* Preview Section */
.preview-section {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 50px;
}

@media (max-width: 900px) {
    .preview-section {
        grid-template-columns: 1fr;
    }
}

.controls-panel {
    background-color: var(--bg-card);
    padding: 32px;
    border-radius: 8px;
    border: none;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.control-group label {
    display: block;
    font-size: 0.65rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 12px;
}

.controls-panel select {
    width: 100%;
    padding: 14px 16px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}

.controls-panel select:focus {
    border-color: var(--accent);
}

.lut-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.lut-btn {
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 14px 16px;
    border-radius: 4px;
    text-align: left;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.lut-btn:hover {
    border-color: var(--text-muted);
    color: var(--text-primary);
}

.lut-btn.active {
    background-color: var(--bg-primary);
    border-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
}

/* Canvas Area */
.canvas-container {
    background-color: transparent;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    border: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

#glcanvas {
    max-width: 100%;
    max-height: 70vh;
}

.compare-slider-container {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
}

#compare-btn {
    background-color: rgba(0, 0, 0, 0.6) !important;
    color: #fff !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    backdrop-filter: blur(8px);
    font-family: var(--font-body);
    font-size: 0.7rem !important;
    letter-spacing: 1px;
    text-transform: uppercase;
    border-radius: 30px !important;
    padding: 10px 24px !important;
}

#compare-btn:hover {
    background-color: rgba(0, 0, 0, 0.8) !important;
}

#btn-reupload {
    padding: 14px;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    border: 1px solid var(--text-primary);
    background-color: transparent;
    color: var(--text-primary);
    transition: var(--transition);
    margin-top: 20px;
}

#btn-reupload:hover {
    background-color: var(--text-primary);
    color: var(--bg-primary);
}