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

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

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

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.calculator-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.calc-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calc-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.calc-card h2 {
    color: #4a5568;
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.calc-card p {
    color: #718096;
    margin-bottom: 25px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #2d3748;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.results {
    margin-top: 25px;
    padding: 20px;
    background: #f7fafc;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding: 8px 0;
}

.result-item:last-child {
    margin-bottom: 0;
}

.result-item .label {
    font-weight: 600;
    color: #4a5568;
}

.result-item .value {
    font-size: 1.2rem;
    font-weight: 700;
    color: #2b6cb0;
}

.info-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.info-section h3 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.info-section ul {
    list-style: none;
    padding: 0;
}

.info-section li {
    padding: 10px 0;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: flex-start;
}

.info-section li:last-child {
    border-bottom: none;
}

.info-section li strong {
    color: #667eea;
    margin-right: 10px;
    min-width: 40px;
}

.api-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.api-section h3 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.api-example {
    background: #f7fafc;
    border-radius: 8px;
    padding: 20px;
    border: 1px solid #e2e8f0;
}

.api-example h4 {
    color: #4a5568;
    margin-bottom: 15px;
}

.api-example pre {
    background: #2d3748;
    color: #e2e8f0;
    padding: 15px;
    border-radius: 6px;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
}

@media (max-width: 768px) {
    .calculator-section {
        grid-template-columns: 1fr;
    }

    header h1 {
        font-size: 2rem;
    }

    .calc-card {
        padding: 20px;
    }
}