* {
    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: #2c3e50;
    background: #f5f6fa;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-success {
    background: #27ae60;
    color: white;
}

.btn-success:hover {
    background: #229954;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

.btn-danger:hover {
    background: #c0392b;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
}

.error {
    background-color: #fee;
    color: #c0392b;
    padding: 15px;
    border-radius: 6px;
    margin-top: 20px;
    text-align: center;
}

.success {
    background-color: #efe;
    color: #27ae60;
    padding: 15px;
    border-radius: 6px;
    margin-top: 20px;
    text-align: center;
}

@media (max-width: 768px) {
    .btn {
        width: 100%;
        margin-bottom: 10px;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }
}