.candle-sand-calculator {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.calculator-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: 20px;
    color: #333;
}

.calculator-description {
    text-align: center;
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 40px;
    line-height: 1.6;
}

.calculator-form {
    display: grid;
    gap: 30px;
    margin-bottom: 40px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.info-icon {
    margin-left: 5px;
    color: #999;
    cursor: help;
}

.input-wrapper input,
.input-with-unit input,
select {
    padding: 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background-color: #fafafa;
}

.input-wrapper input:focus,
.input-with-unit input:focus,
select:focus {
    outline: none;
    border-color: #000;
    background-color: #ffffff;
}

.input-with-unit {
    display: flex;
    gap: 12px;
}

.input-with-unit input {
    flex: 1;
}

.input-with-unit select {
    min-width: 120px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%23666' d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 12px;
    padding-right: 40px;
}

.calculate-btn {
    background: linear-gradient(135deg, #333 0%, #000 100%);
    color: white;
    border: none;
    padding: 18px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 20px;
}

.calculate-btn:hover {
    background: linear-gradient(135deg, #444 0%, #222 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

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

.result-section {
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    margin-top: 30px;
}

.result-text {
    color: #666;
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.result-value {
    font-size: 3.5rem;
    font-weight: 300;
    color: #000;
    margin: 0;
}

@media (max-width: 768px) {
    .candle-sand-calculator {
        padding: 20px;
        margin: 10px;
    }
    
    .calculator-title {
        font-size: 2rem;
    }
    
    .input-with-unit {
        flex-direction: column;
    }
    
    .input-with-unit select {
        min-width: auto;
    }
    
    .result-value {
        font-size: 2.5rem;
    }
}

.input-wrapper input::placeholder,
.input-with-unit input::placeholder {
    color: #999;
    font-style: italic;
}