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

body {
    font-family: 'Courier New', 'Courier', monospace;
    background: #0d1b2a;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.calculator {
    background: #000;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.2);
    max-width: 400px;
    width: 100%;
    border: 2px solid #fff;
}

.calculator-header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid #fff;
}

h1 {
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.display {
    background: #1a1a1a;
    border-radius: 6px;
    padding: 20px 16px;
    margin-bottom: 20px;
    border: 3px inset #333;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
}

.display-label {
    color: #fff;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
    font-weight: 600;
    opacity: 0.8;
}

.display-value {
    color: #fff;
    font-size: 2rem;
    font-weight: 700;
    text-align: right;
    font-family: 'Courier New', monospace;
    letter-spacing: 1px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.calculator-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.input-row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-row label {
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

input[type="date"],
input[type="number"] {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid #333;
    border-radius: 4px;
    font-size: 0.9375rem;
    font-family: 'Courier New', monospace;
    background: #0a0a0a;
    color: #fff;
    transition: all 0.15s ease;
}

input[type="date"]::placeholder,
input[type="number"]::placeholder {
    color: #fff;
    opacity: 0.5;
}

input[type="date"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: #fff;
    background: #000;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.3), 0 0 10px rgba(255, 255, 255, 0.2);
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
}

.calc-button {
    width: 100%;
    padding: 14px;
    background: #fff;
    color: #000;
    border: 2px solid #fff;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 4px;
    box-shadow: 0 3px 0 #ccc, 0 0 15px rgba(255, 255, 255, 0.4);
}

.calc-button:hover {
    background: #f0f0f0;
    border-color: #f0f0f0;
    transform: translateY(1px);
    box-shadow: 0 2px 0 #bbb, 0 0 20px rgba(255, 255, 255, 0.6);
}

.calc-button:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 #aaa, 0 0 15px rgba(255, 255, 255, 0.5);
}

.result {
    margin-top: 16px;
    padding: 12px;
    background: #0a0a0a;
    border-radius: 4px;
    border: 1px solid #fff;
    font-size: 0.8rem;
}

.result.hidden {
    display: none;
}

.result h3 {
    color: #fff;
    margin-bottom: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result p {
    color: #fff;
    margin: 4px 0;
    font-size: 0.8rem;
    line-height: 1.4;
    font-family: 'Courier New', monospace;
}

.result p strong {
    color: #fff;
    font-weight: 700;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}