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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 25px 0;
}

header h1 {
    font-size: 2.5em;
    color: #2c3e50;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2em;
    color: #34495e;
}

.card {
    background: white;
    border-radius: 10px;
    padding: 40px;
    margin: 30px 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 20px;
}

.card h3 {
    color: #2c3e50;
    margin-bottom: 20px;
}

.card p {
    margin-bottom: 30px;
    color: #000;
    text-align: left;
}

.btn {
    background: #00c7b7;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 1.1em;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.btn:hover {
    background: #00b3a4;
}

.message {
    margin-top: 20px;
    font-size: 1.1em;
    color: #27ae60;
    min-height: 30px;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

.feature-card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.feature-card h3 {
    color: #2c3e50;
    margin-bottom: 15px;
}

.feature-card p {
    color: #7f8c8d;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: #34495e;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    .card {
        padding: 20px;
    }
}