:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #3f37c9;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --success-color: #4bb543;
    --error-color: #ff3333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7ff;
    color: var(--dark-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.tool-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 2rem;
}

.upload-area {
    border: 2px dashed var(--gray-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

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

.upload-area svg {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.upload-area h3 {
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.upload-area p {
    margin: 0.5rem 0;
    color: var(--gray-color);
}

.password-section {
    margin-bottom: 1.5rem;
    text-align: center;
}

.password-section h3 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.password-section input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.password-section input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.status {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1.5rem;
    text-align: center;
    display: none;
}

.status.success {
    background-color: rgba(75, 181, 67, 0.1);
    color: var(--success-color);
    display: block;
}

.status.error {
    background-color: rgba(255, 51, 51, 0.1);
    color: var(--error-color);
    display: block;
}

.info-box {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.info-box h3 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.info-box ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.info-box p {
    color: var(--gray-color);
    font-size: 0.9rem;
}

footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--gray-color);
    font-size: 0.9rem;
    margin-top: auto;
}

/* Drag and drop styles */
.upload-area.highlight {
    border-color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

/* Responsive styles */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .tool-container {
        padding: 1.5rem;
    }
}