body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    line-height: 1.6;
}

.signup-card {
    background-color: #fff;
    padding: 2.5em;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin: auto;
    margin-top: 20px;
    width: 70vw;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 1.5em;
}

.signup-card h2 {
    text-align: center;
    color: #2c3e50;
    margin: 0 0 0.5em 0;
    font-size: 2.2em;
    font-weight: 300;
}

.form-control {
    padding: 0.8rem;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    background-color: #f8f9fa;
    color: #2c3e50;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.2em;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    align-self: center;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    margin-top: 1em;
}

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

.btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}