:root {
    --primary-color: #4a6bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7fa;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.upload-section {
    margin-bottom: 30px;
}

.drop-zone {
    border: 2px dashed var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    background-color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.drop-zone:hover {
    border-color: var(--primary-color);
    background-color: rgba(74, 107, 255, 0.05);
}

.drop-zone input[type="file"] {
    display: none;
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-top: 20px;
    width: 100%;
}

.preview-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f0f0f0;
    width: 100%;
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.tools-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.tool-card {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.tool-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.tool-controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tool-controls select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    background-color: white;
    color: var(--dark-color);
    font-size: 14px;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 15px;
    padding-right: 30px;
}

.tool-controls select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 107, 255, 0.1);
}

.tool-controls select:hover {
    border-color: var(--primary-color);
}

.tool-card .btn {
    margin-top: auto;
}

input[type="range"] {
    width: 100%;
    margin: 10px 0;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #3a5bef;
}

.result-section {
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-top: 30px;
}

.result-container {
    margin: 20px 0;
    text-align: center;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.result-item {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.result-image {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    cursor: pointer;
    transition: transform 0.2s;
}

.result-image:hover {
    transform: scale(1.02);
}

.download-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.download-btn:hover {
    background-color: #3a5bef;
}

.preview-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.preview-modal.active {
    display: flex;
}

.preview-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-content img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
}

.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 24px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
    z-index: 1;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.4);
}

.prev-btn {
    left: 20px;
}

.next-btn {
    right: 20px;
}

.close-btn {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 30px;
    cursor: pointer;
    padding: 5px;
    z-index: 1;
}

.result-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .tools-section {
        grid-template-columns: 1fr;
    }
    
    .drop-zone {
        padding: 20px;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .preview-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .result-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .nav-btn {
        width: 30px;
        height: 30px;
        font-size: 18px;
    }
    
    .prev-btn {
        left: 10px;
    }
    
    .next-btn {
        right: 10px;
    }
}