:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #4cc9f0;
    --danger-color: #f72585;
    --warning-color: #f8961e;
    --info-color: #4895ef;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: #f5f7fa;
    color: var(--dark-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 5px;
}

header .subtitle {
    color: #6c757d;
    font-size: 1rem;
}

.app-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
    margin-bottom: 30px;
}

.upload-section {
    width: 100%;
}

.drop-area {
    border: 2px dashed #ced4da;
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.drop-area:hover {
    border-color: var(--primary-color);
}

.drop-area i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.drop-area h3 {
    margin-bottom: 10px;
    color: var(--dark-color);
}

.drop-area p {
    color: #6c757d;
    margin-bottom: 20px;
}

.drop-area input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

.btn-upload {
    background-color: var(--primary-color);
}

.btn-secondary {
    background-color: #6c757d;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-download {
    background-color: var(--success-color);
}

.btn-download:hover {
    background-color: #3aa8d8;
}

.btn-reset {
    background-color: var(--danger-color);
}

.btn-reset:hover {
    background-color: #e51774;
}

.preview-info {
    margin-top: 15px;
    font-size: 0.9rem;
    color: #6c757d;
}

.preview-info span {
    display: block;
}

.editor-section {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.image-preview-container {
    flex: 1;
    min-width: 300px;
}

.preview-wrapper {
    position: relative;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 20px;
    background-color: #f8f9fa;
    min-height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

#imageCanvas {
    max-width: 100%;
    display: block;
}

.placeholder {
    position: absolute;
    text-align: center;
    padding: 20px;
    color: #6c757d;
}

.placeholder i {
    font-size: 4rem;
    margin-bottom: 15px;
    color: #adb5bd;
}

.controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.watermark-controls {
    flex: 1;
    min-width: 300px;
}

.tabs {
    display: flex;
    border-bottom: 1px solid #dee2e6;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 10px 20px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: #6c757d;
    position: relative;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary-color);
    font-weight: 500;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
}

.form-group input[type="text"],
.form-group input[type="color"],
.form-group input[type="range"],
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
    font-family: inherit;
    transition: var(--transition);
}

.form-group input[type="text"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.form-group input[type="range"] {
    -webkit-appearance: none;
    height: 8px;
    background: #e9ecef;
    border-radius: 5px;
    padding: 0;
    margin-top: 10px;
}

.form-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.checkbox-group {
    display: flex;
    gap: 15px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: normal;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 16px;
    height: 16px;
}

footer {
    text-align: center;
    padding: 20px 0;
    color: #6c757d;
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 10px;
}

.social-links a {
    color: #6c757d;
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
}

.notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--success-color);
    color: white;
    padding: 15px 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
}

.notification.show {
    transform: translateY(0);
    opacity: 1;
}

@media (max-width: 768px) {
    .editor-section {
        flex-direction: column;
    }
    
    .image-preview-container,
    .watermark-controls {
        width: 100%;
    }
    
    header h1 {
        font-size: 2rem;
    }
}