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

body {
    font-family: 'Space Mono', monospace;
    background-color: #ffffff;
    color: #1a1a1a;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: #1a1a1a;
}

.subtitle {
    font-size: 1.1rem;
    color: #666;
    font-weight: 400;
}

main {
    display: grid;
    gap: 3rem;
}

.calculator-section {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid #e9ecef;
    transition: box-shadow 0.3s ease;
}

.calculator-section:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #1a1a1a;
}

.input-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.full-width {
    grid-column: 1 / -1;
}

label {
    font-weight: 700;
    font-size: 0.9rem;
    color: #333;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input, select {
    padding: 0.8rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-family: 'Space Mono', monospace;
    font-size: 1rem;
    background: white;
    transition: all 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: #1a1a1a;
    box-shadow: 0 0 0 3px rgba(26, 26, 26, 0.1);
}

input:hover, select:hover {
    border-color: #666;
}

.calculate-btn {
    padding: 1rem 2rem;
    background: #1a1a1a;
    color: white;
    border: none;
    border-radius: 8px;
    font-family: 'Space Mono', monospace;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.5rem;
}

.calculate-btn:hover {
    background: #333;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.calculate-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.result-box {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    border: 2px solid #e9ecef;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: #1a1a1a;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s ease;
}

.result-box.show {
    opacity: 1;
    transform: translateY(0);
}

.result-box.success {
    border-color: #28a745;
    background: #f8fff9;
    color: #155724;
}

.result-box.error {
    border-color: #dc3545;
    background: #fff8f8;
    color: #721c24;
}

footer {
    margin-top: 3rem;
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #e9ecef;
}

.info {
    font-size: 0.9rem;
    color: #666;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .input-row {
        grid-template-columns: 1fr;
    }
    
    .calculator-section {
        padding: 1.5rem;
    }
}