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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

h1 {
    color: #333;
    margin-bottom: 30px;
    text-align: center;
    font-size: 2rem;
}

h2 {
    color: #555;
    font-size: 1.3rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #667eea;
}

.form-section {
    margin-bottom: 35px;
}

.form-group {
    margin-bottom: 20px;
    flex: 1;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
    font-size: 0.95rem;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

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

.results {
    margin-top: 40px;
    padding: 30px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.results h2 {
    color: #667eea;
    border-bottom: none;
    margin-bottom: 20px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid #e0e0e0;
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    color: #555;
    font-weight: 500;
}

.result-value {
    color: #333;
    font-weight: 600;
    font-size: 1.1rem;
}

.result-highlight {
    background: #667eea;
    color: white;
    padding: 15px;
    border-radius: 6px;
    margin: 10px 0;
}

.error {
    background: #ff4444;
    color: white;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    h1 {
        font-size: 1.5rem;
    }
}