.upload-area {
    background: #f8fafc;
    border: 2px dashed #cbd5e1;
    border-radius: 24px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    margin-bottom: 20px;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: #3b82f6;
    background: #eff6ff;
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 12px;
}

.upload-area p {
    color: #64748b;
    font-size: 0.95rem;
}

.options-panel {
    margin-bottom: 20px;
}

.option-group {
    margin-bottom: 16px;
}

.option-group label {
    display: block;
    font-weight: 500;
    color: #334155;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #e2e8f0;
    outline: none;
    -webkit-appearance: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
}

.slider-container span {
    font-weight: 600;
    color: #3b82f6;
    min-width: 50px;
    text-align: right;
}

.quality-presets {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.preset-btn {
    flex: 1;
    min-width: 70px;
    padding: 8px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 40px;
    background: white;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover {
    border-color: #3b82f6;
    color: #3b82f6;
}

.preview-panel {
    margin-bottom: 20px;
}

.preview-row {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.preview-box {
    flex: 1;
    min-width: 120px;
}

.preview-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: #64748b;
    margin-bottom: 8px;
    text-align: center;
}

.preview-img {
    width: 100%;
    max-height: 180px;
    object-fit: contain;
    border-radius: 12px;
    background: #f8fafc;
    padding: 8px;
}

.arrow {
    font-size: 24px;
    color: #94a3b8;
    flex-shrink: 0;
}

.file-info {
    font-size: 0.75rem;
    color: #64748b;
    text-align: center;
    margin-top: 8px;
    word-break: break-all;
}

.download-btn {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 12px;
    border: none;
    background: #10b981;
    color: white;
    cursor: pointer;
    transition: 0.2s;
}

.download-btn:hover {
    background: #059669;
}

.download-btn:active {
    transform: scale(0.98);
}

.result-message {
    text-align: center;
    padding: 12px;
    border-radius: 12px;
    font-size: 0.9rem;
}

.result-message.error {
    background: #fee2e2;
    color: #b91c1c;
}