:root {
    --main-color: #5a67d8;
    --main-dark: #4c51bf;
    --main-light: rgba(90, 103, 216, 0.1);
    --accent: #0bc5ea;
    --dark-text: #1a202c;
    --light-bg: #edf2f7;
    --gray-text: #4a5568;
    --light-border: #c0c0c0;
    --corner-radius: 10px;
    --shadow-effect: 0 6px 20px rgba(0,0,0,0.08);
    --smooth-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
    width: 100%;
    transition: var(--smooth-transition);
    gap: 10px;
}

.control-panel {
    background: white;
    padding: 20px;
    overflow-y: auto;
    border: 1px solid rgb(207, 207, 207);
    border-radius: 10px;
    transition: var(--smooth-transition);
}

.panel-heading {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--main-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-heading i {
    font-size: 1.3rem;
}

.input-group {
    margin-bottom: 18px;
}

.input-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-text);
    font-size: 0.9rem;
}

.input-field {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--light-border);
    border-radius: var(--corner-radius);
    font-size: 0.95rem;
    transition: var(--smooth-transition);
    background: white;
}

.input-field:focus {
    border-color: var(--main-color);
    box-shadow: 0 0 0 3px rgba(90, 103, 216, 0.15);
    outline: none;
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.range-input {
    flex: 1;
    -webkit-appearance: none;
    height: 5px;
    background: var(--light-border);
    border-radius: 2px;
}

.range-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--main-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--smooth-transition);
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.range-input::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 0 0 4px rgba(90, 103, 216, 0.15);
}

.slider-value {
    width: 45px;
    text-align: center;
    font-weight: 600;
    color: var(--main-color);
    font-size: 0.95rem;
}

.toggle-option {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
    cursor: pointer;
}

.toggle-option input {
    margin-right: 8px;
    width: 16px;
    height: 16px;
    accent-color: var(--main-color);
    cursor: pointer;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border-radius: var(--corner-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--smooth-transition);
    border: none;
    outline: none;
    gap: 6px;
    font-size: 0.95rem;
    width: 100%;
    margin-top: 8px;
}

.primary-btn {
    background: var(--main-color);
    color: white;
    box-shadow: 0 3px 10px rgba(90, 103, 216, 0.2);
}

.primary-btn:hover {
    background: var(--main-dark);
    box-shadow: 0 5px 14px rgba(90, 103, 216, 0.25);
    transform: translateY(-1px);
}

.action-btn i {
    font-size: 1rem;
}

.expand-settings {
    display: flex;
    align-items: center;
    color: var(--main-color);
    font-weight: 600;
    background: none;
    border: none;
    padding: 10px 0;
    cursor: pointer;
    margin: 15px 0;
    font-size: 0.95rem;
    gap: 6px;
    transition: var(--smooth-transition);
    width: 100%;
    justify-content: space-between;
}

.expand-settings:hover {
    color: var(--main-dark);
}

.expand-settings i {
    transition: var(--smooth-transition);
}

.expand-settings.active i {
    transform: rotate(180deg);
}

.extra-settings {
    display: none;
    padding-top: 12px;
    border-top: 1px solid var(--light-border);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.color-swatch {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    display: inline-block;
    vertical-align: middle;
    margin-left: 8px;
    border: 1px solid var(--light-border);
}

.content-area {
    display: grid;
    padding: 10px;
    grid-template-rows: auto 1fr;
    gap: 15px;
    border: 1px solid rgb(184, 183, 183);
    border-radius: 15px;
}

.upload-section {
    background: white;
    border-radius: var(--corner-radius);
    box-shadow: var(--shadow-effect);
    padding: 25px;
}

.drag-area {
    border: 2px dashed var(--main-color);
    border-radius: var(--corner-radius);
    padding: 35px 15px;
    text-align: center;
    cursor: pointer;
    transition: var(--smooth-transition);
    margin-bottom: 15px;
    background: var(--main-light);
    position: relative;
    overflow: hidden;
}

.drag-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--main-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.drag-area:hover {
    background: rgba(90, 103, 216, 0.12);
}

.drag-area:hover::before {
    transform: scaleX(1);
}

.drag-area.active {
    border-color: var(--accent);
    background: rgba(11, 197, 234, 0.08);
}

.upload-symbol {
    font-size: 42px;
    color: var(--main-color);
    margin-bottom: 12px;
    transition: var(--smooth-transition);
}

.drag-area:hover .upload-symbol {
    transform: scale(1.08);
}

.upload-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--dark-text);
}

.upload-note {
    font-size: 0.9rem;
    color: var(--gray-text);
}

.image-input {
    display: none;
}

.file-details {
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--gray-text);
    display: flex;
    justify-content: space-between;
    background: rgba(90, 103, 216, 0.04);
    padding: 10px 12px;
    border-radius: var(--corner-radius);
}

.preview-panel {
    background: white;
    padding: 25px;
    border-radius: 10px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.preview-block {
    display: flex;
    flex-direction: column;
}

.preview-heading {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--dark-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.preview-heading i {
    color: var(--main-color);
    font-size: 1.1rem;
}

.image-viewer {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #f7fafc;
    border-radius: var(--corner-radius);
    padding: 15px;
    position: relative;
    overflow: hidden;
}

.image-viewer::before {
    content: 'PREVIEW';
    position: absolute;
    top: 8px;
    left: 8px;
    background: rgba(0,0,0,0.6);
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 600;
}

.preview-img {
    max-width: 100%;
    max-height: 280px;
    border-radius: var(--corner-radius);
    display: block;
    margin: 0 auto;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
    transition: var(--smooth-transition);
    object-fit: contain;
}

.preview-img:hover {
    transform: scale(1.01);
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
}

.preview-empty {
    width: 100%;
    height: 180px;
    background: var(--main-light);
    border: 2px dashed var(--main-color);
    border-radius: var(--corner-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-text);
    transition: var(--smooth-transition);
}

.preview-empty:hover {
    background: rgba(90, 103, 216, 0.12);
}

.preview-empty i {
    font-size: 38px;
    margin-bottom: 10px;
    color: var(--main-color);
    transition: var(--smooth-transition);
}

.preview-empty:hover i {
    transform: scale(1.08);
}

.preview-details {
    margin-top: 15px;
    font-size: 0.85rem;
    color: var(--gray-text);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
}

.detail-label {
    font-weight: 600;
    color: var(--dark-text);
}

.alert-box {
    padding: 14px;
    border-radius: var(--corner-radius);
    margin-bottom: 15px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-box i {
    font-size: 1.1rem;
}

.alert-success {
    background: rgba(72, 187, 120, 0.12);
    color: #48bb78;
    display: flex;
}

.alert-error {
    background: rgba(245, 101, 101, 0.12);
    color: #f56565;
    display: flex;
}

.alert-info {
    background: rgba(246, 173, 85, 0.12);
    color: #f6ad55;
    display: flex;
}

.image-selector {
    display: inline-block;
    padding: 10px 20px;
    background: var(--main-color);
    color: white;
    border-radius: var(--corner-radius);
    cursor: pointer;
    transition: var(--smooth-transition);
    font-weight: 600;
    text-align: center;
    margin-top: 8px;
    width: 100%;
}

.image-selector:hover {
    background: var(--main-dark);
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(90, 103, 216, 0.25);
}

.image-list {
    margin-top: 15px;
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid var(--light-border);
    border-radius: var(--corner-radius);
    padding: 10px;
}

.image-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px;
    background: var(--main-light);
    border-radius: var(--corner-radius);
    margin-bottom: 8px;
    cursor: pointer;
    transition: var(--smooth-transition);
}

.image-item:hover {
    background: rgba(90, 103, 216, 0.15);
}

.image-item.active {
    background: rgba(90, 103, 216, 0.25);
    border: 1px solid var(--main-color);
}

.image-item span {
    font-size: 0.9rem;
    color: var(--dark-text);
    flex: 1;
}

.image-item i {
    font-size: 1rem;
    color: var(--gray-text);
    cursor: pointer;
    margin-left: 10px;
}

.image-item i:hover {
    color: #f56565;
}

@media (max-width: 1024px) {
    .app-wrapper {
        grid-template-columns: 1fr;
    }
    .control-panel {
        border-bottom: 1px solid var(--light-border);
    }
}

@media (max-width: 640px) {
    .content-area {
        padding: 15px;
    }
    .preview-panel {
        grid-template-columns: 1fr;
    }
    .drag-area {
        padding: 25px 15px;
    }
}