:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #3f37c9;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --success-color: #4bb543;
    --danger-color: #dc3545;
    --border-radius: 8px;
    --box-shadow: 0 10px 20px 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;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f5f7ff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin: 30px 0 40px;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

header p {
    color: var(--gray-color);
    font-size: 1.1rem;
}

.converter-box {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 30px;
    margin-bottom: 40px;
    transition: var(--transition);
}

.upload-area {
    border: 2px dashed var(--gray-color);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(67, 97, 238, 0.05);
}

.upload-area i {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.upload-area h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.upload-area p {
    color: var(--gray-color);
    margin: 10px 0;
}

.btn-select {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin: 10px 0;
}

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

.formats-info {
    font-size: 0.9rem;
    color: var(--gray-color);
    margin-top: 20px;
}

.preview-area {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.image-preview {
    width: 100%;
    max-height: 400px;
    border-radius: var(--border-radius);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f1f3f5;
}

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

.settings {
    background: #f8f9fa;
    padding: 20px;
    border-radius: var(--border-radius);
}

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

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

.setting-group input[type="range"] {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    background: #ddd;
    border-radius: 5px;
    outline: none;
    margin: 10px 0;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.setting-group input[type="text"] {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.btn-group {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}

.btn-convert {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
}

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

.btn-cancel, .btn-new {
    background-color: white;
    color: var(--dark-color);
    border: 1px solid #ddd;
    padding: 12px 25px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
}

.btn-cancel:hover, .btn-new:hover {
    background-color: #f1f3f5;
    transform: translateY(-2px);
}

.result-area {
    display: flex;
    justify-content: center;
}

.result-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    display: flex;
    max-width: 800px;
    width: 100%;
}

.result-preview {
    flex: 1;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #f8f9fa;
}

.result-preview img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
}

.result-info {
    flex: 1;
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.result-info h4 {
    font-size: 1.5rem;
    color: var(--success-color);
    margin-bottom: 15px;
}

.result-info p {
    color: var(--gray-color);
    margin-bottom: 25px;
}

.result-actions {
    display: flex;
    gap: 15px;
}

.btn-download {
    background-color: var(--success-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
}

.btn-download:hover {
    background-color: #3fa038;
    transform: translateY(-2px);
}

.features {
    margin-bottom: 40px;
}

.features h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.8rem;
    color: var(--dark-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.feature-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.feature-card p {
    color: var(--gray-color);
    font-size: 0.95rem;
}

footer {
    text-align: center;
    margin-top: auto;
    padding: 20px;
    color: var(--gray-color);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 10px;
}

.footer-links a {
    color: var(--gray-color);
    text-decoration: none;
    transition: var(--transition);
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    display: none;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    font-size: 1.2rem;
    color: var(--dark-color);
}

/* Responsive Styles */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .converter-box {
        padding: 20px;
    }

    .result-card {
        flex-direction: column;
    }

    .result-preview, .result-info {
        flex: none;
        width: 100%;
    }

    .btn-group, .result-actions {
        flex-direction: column;
    }

    .btn-convert, .btn-cancel, .btn-download, .btn-new {
        width: 100%;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
        flex-direction: column;
        gap: 10px;
    }

    .upload-area {
        padding: 30px 15px;
    }

    .upload-area h3 {
        font-size: 1.3rem;
    }

    .features h2 {
        font-size: 1.5rem;
    }
}