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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 20px;
    line-height: 1.6;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 15px;
}

h1 {
    color: #ff6600;
    text-align: center;
    margin-bottom: 10px;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 40px;
    font-size: clamp(0.9rem, 2vw, 1.1rem);
}

.calculator-section {
    border: 2px solid #ff6600;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 25px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 600;
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

input[type="number"] {
    width: 100%;
    padding: 15px 80px 15px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: clamp(1rem, 2vw, 1.1rem);
    transition: border-color 0.3s;
}

input[type="number"]:focus {
    outline: none;
    border-color: #ff6600;
}

.unit {
    position: absolute;
    right: 40px;
    color: #666;
    font-weight: 600;
    pointer-events: none;
    background: white;
    padding: 2px 5px;
}

.recommended {
    display: inline-block;
    margin-left: 10px;
    color: #ff6600;
    font-size: 0.9rem;
    font-weight: normal;
}

.results-section {
    border: 2px solid #ff6600;
    border-radius: 15px;
    padding: 30px;
    display: none;
}

.results-section.show {
    display: block;
}

.result-value {
    background: linear-gradient(135deg, #ff6600 0%, #ff8533 100%);
    color: white;
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 25px;
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    text-align: center;
}

.result-item {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    font-weight: bold;
}

.result-label {
    font-size: clamp(0.9rem, 2vw, 1rem);
    font-weight: normal;
    opacity: 0.9;
    margin-bottom: 5px;
}

@media (max-width: 600px) {
    .result-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
}

.formula-section {
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 15px;
}

.formula-title {
    color: #ff6600;
    font-weight: 600;
    margin-bottom: 10px;
    font-size: clamp(1rem, 2vw, 1.1rem);
}

.formula {
    font-family: 'Courier New', monospace;
    padding: 15px;
    border-left: 3px solid #ff6600;
    margin: 10px 0;
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.calculation-step {
    margin: 10px 0;
    padding: 10px;
    border-radius: 5px;
}

.info-box {
    border: 1px solid #ff6600;
    border-radius: 8px;
    padding: 15px;
    margin-top: 20px;
}

.info-box h3 {
    color: #ff6600;
    margin-bottom: 10px;
    font-size: clamp(1rem, 2vw, 1.1rem);
}

.info-box ul {
    margin-left: 20px;
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.info-box li {
    margin-bottom: 8px;
}

@media (max-width: 768px) {
    .calculator-section, .results-section {
        padding: 20px;
    }
    
    .container {
        padding: 0 10px;
    }
}