/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 100%;
    text-align: center;
}

h2 {
    color: #333;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: 300;
}

form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

label {
    font-size: 16px;
    color: #555;
    text-align: left;
    font-weight: 500;
}

input[type="file"] {
    padding: 12px;
    border: 2px dashed #ddd;
    border-radius: 8px;
    background: #f9f9f9;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
}

input[type="file"]:hover {
    border-color: #667eea;
    background: #f0f4ff;
}

input[type="submit"] {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

input[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

input[type="submit"]:active {
    transform: translateY(0);
}

/* Message styles */
.success {
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #c3e6cb;
    margin-top: 20px;
    font-weight: 500;
}

.error {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #f5c6cb;
    margin-top: 20px;
    font-weight: 500;
}

.success a {
    color: #155724;
    text-decoration: none;
    font-weight: 700;
    border-bottom: 2px solid #155724;
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

.success a:hover {
    color: #0d4419;
    border-bottom-color: #0d4419;
}

/* Responsive design */
@media (max-width: 600px) {
    .container {
        padding: 30px 20px;
        margin: 10px;
    }
    
    h2 {
        font-size: 24px;
    }
    
    input[type="submit"] {
        padding: 12px 25px;
        font-size: 14px;
    }
}

/* Loading animation */
.loading {
    display: none;
    margin-top: 20px;
}

.loading::after {
    content: "";
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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