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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: #1e1e2e;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    width: 90%;
    max-width: 400px;
    border: 1px solid #2d2d3f;
}

.warning {
    background: #ff6b6b;
    color: white;
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    text-align: center;
}

h1 {
    text-align: center;
    color: #64b5f6;
    margin-bottom: 2rem;
}

.payment-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

label {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: #555;
}

input, select {
    padding: 0.8rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

input:focus, select:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
}

.amount-display {
    background: #2d2d3f;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 1rem;
    border: 1px solid #3d3d4f;
}

.amount {
    font-size: 2rem;
    font-weight: bold;
    color: #64b5f6;
}