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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.banner {
    background-color: #2d3748;
    color: white;
    text-align: center;
    padding: 40px 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.banner h1 {
    font-size: 3rem;
    letter-spacing: 4px;
    font-weight: bold;
    text-transform: uppercase;
}

.container {
    max-width: 800px;
    margin: 50px auto;
    padding: 40px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 2rem;
}

h3 {
    color: #667eea;
    margin-bottom: 15px;
}

p {
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.card {
    background: #f7fafc;
    border-left: 4px solid #667eea;
    padding: 20px;
    margin: 30px 0;
    border-radius: 8px;
}

.card p {
    margin-bottom: 10px;
}

.card span {
    font-weight: bold;
    color: #764ba2;
}

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 20px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn:active {
    transform: translateY(0);
}

.message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    font-weight: bold;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.message.show {
    opacity: 1;
}

.message.success {
    background-color: #c6f6d5;
    color: #22543d;
}