body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f7f9fc;
    margin: 0;
    padding: 40px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container {
    max-width: 500px;
    width: 100%;
    background: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 26px;
    font-weight: 700;
    color: #333;
    margin-top: 0;
    margin-bottom: 30px;
    text-align: center;
}

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

label {
    font-weight: 600;
    color: #555;
}

input[type="file"] {
    border: 2px dashed #ddd;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.3s;
}

input[type="file"]::-webkit-file-upload-button {
    display: none;
}

input[type="file"]::before {
    content: 'Click to Upload or Drag & Drop';
    font-weight: 600;
    color: #888;
}

input[type="file"]:hover {
    border-color: #007bff;
}

button {
    padding: 15px;
    font-size: 18px;
    font-weight: bold;
    background: linear-gradient(45deg, #007bff, #0056b3);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.result {
    margin-top: 30px;
    padding: 25px;
    border: 1px solid #ddd;
    border-radius: 10px;
    text-align: center;
}

.result h2 {
    font-size: 20px;
    color: #333;
    margin-top: 0;
    margin-bottom: 15px;
}

.result-message {
    font-size: 22px;
    font-weight: bold;
    padding: 15px;
    border-radius: 8px;
}

.result-success {
    color: #155724;
    background-color: #d4edda;
}

.result-fail {
    color: #721c24;
    background-color: #f8d7da;
}