body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #121212;
    color: #e0e0e0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}
.calculator-card {
    background: #1e1e1e;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    width: 100%;
    max-width: 600px;
    position: relative;
    border: 1px solid #2d2d2d;
}
.logo-container {
    text-align: center;
    margin-bottom: 15px;
    padding-top: 15px;
}
.logo-text {
    font-size: 34px;
    font-weight: 900;
    letter-spacing: 1px;
    color: #00E5FF;
    text-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
}
.logo-dot {
    color: #FF6D00;
    font-size: 38px;
}
.logo-sub {
    color: #FF6D00;
    font-weight: 600;
    text-shadow: 0 0 10px rgba(255, 109, 0, 0.2);
}
.lang-switch {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #2d2d2d;
    color: #e0e0e0;
    border: 1px solid #444;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 12px;
}
h2 {
    text-align: center;
    color: #b0b0b0;
    margin-top: 0px;
    margin-bottom: 25px;
    font-size: 16px;
    font-weight: 400;
    opacity: 0.8;
}
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}
.input-group {
    margin-bottom: 15px;
}
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding: 5px 0;
}
.checkbox-group input {
    width: auto;
    cursor: pointer;
    transform: scale(1.2);
}
.checkbox-group label {
    margin-bottom: 0;
    cursor: pointer;
    font-size: 14px;
    color: #e0e0e0;
}
.full-width {
    grid-column: span 2;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    font-size: 13px;
    color: #b0b0b0;
}
input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #333;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 15px;
    background-color: #252525;
    color: #ffffff;
}
button.calc-btn {
    width: 100%;
    background-color: #00bf63;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}
.results {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px dashed #333;
}
.result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 15px;
}
.total {
    font-size: 20px;
    font-weight: bold;
    color: #00bf63;
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px solid #333;
}
.sale-price {
    font-size: 20px;
    font-weight: bold;
    color: #ff9800;
    margin-top: 10px;
}
@media (max-width: 500px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
    .full-width {
        grid-column: span 1;
    }
    .logo-text {
        font-size: 28px;
    }
}