* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.6;
    padding: 20px;
    background-image: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 40px 0;
    background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
    color: white;
    border-radius: 15px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    position: relative;
    overflow: hidden;
}

header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: #3498db; /* Синий цвет */
}

.header-content {
    position: relative;
    z-index: 1;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.logo i {
    font-size: 2.5rem;
    color: #3498db;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
    color: #d1d8e0;
}

.calculator-container {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 50px;
}

.input-section, .result-section {
    flex: 1;
    min-width: 300px;
    background-color: white;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.input-section:hover, .result-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

h2 {
    color: #2c3e50;
    margin-bottom: 25px;
    font-size: 1.8rem;
    border-bottom: 2px solid #f0f2f5;
    padding-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

h2 i {
    color: #3498db;
}

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

label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #2c3e50;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

label i {
    color: #3498db;
    width: 20px;
}

input[type="number"], select {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s;
    background-color: #f9f9f9;
}

input[type="number"]:focus, select:focus {
    border-color: #3498db;
    outline: none;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.range-container {
    margin-top: 10px;
}

input[type="range"] {
    width: 100%;
    height: 10px;
    border-radius: 5px;
    background: #e0e0e0;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #3498db;
    cursor: pointer;
    border: 3px solid white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.range-values {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    font-size: 0.9rem;
    color: #7f8c8d;
}

.range-values span:nth-child(2) {
    font-weight: bold;
    color: #2c3e50;
}

.value-display {
    margin-top: 8px;
    padding: 12px 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    font-weight: 600;
    color: #2c3e50;
    border-left: 4px solid #3498db;
}

.button-group {
    display: flex;
    gap: 20px;
    margin-top: 40px;
}

button {
    padding: 16px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.calculate-btn {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: white;
}

.calculate-btn:hover {
    background: linear-gradient(135deg, #2980b9 0%, #1c5a7a 100%);
    transform: translateY(-3px);
    box-shadow: 0 7px 15px rgba(52, 152, 219, 0.3);
}

.reset-btn {
    background-color: #f5f5f5;
    color: #555;
    border: 1px solid #ddd;
}

.reset-btn:hover {
    background-color: #e9e9e9;
    transform: translateY(-3px);
    box-shadow: 0 7px 15px rgba(0, 0, 0, 0.1);
}

.result-card {
    background-color: #f8f9fa;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 25px;
    border-left: 5px solid #3498db;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.main-result {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 5px solid #2ecc71;
}

.result-cards {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

.result-cards .result-card {
    flex: 1;
}

.result-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: #2c3e50;
    margin: 15px 0;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.main-result .result-value {
    color: #27ae60;
    font-size: 4rem;
}

.result-unit {
    font-size: 1.2rem;
    color: #7f8c8d;
    font-weight: 600;
}

.result-note {
    margin-top: 15px;
    padding: 12px;
    background-color: #e8f4fc;
    border-radius: 6px;
    color: #2c3e50;
    font-size: 0.95rem;
    border-left: 3px solid #3498db;
}

.loading-indicator {
    text-align: center;
    margin: 40px 0;
    display: none;
}

.spinner {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.placeholder-results {
    text-align: center;
    padding: 50px 20px;
    color: #7f8c8d;
}

.placeholder-results i {
    margin-bottom: 20px;
    color: #bdc3c7;
}

.chart-container {
    margin-top: 30px;
    height: 300px;
    position: relative;
    background-color: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.comparison-section {
    margin-top: 40px;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

.comparison-table th, .comparison-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.comparison-table th {
    background-color: #2c3e50;
    color: white;
    font-weight: 600;
}

.comparison-table tr:hover {
    background-color: #f5f7fa;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.info-section {
    background-color: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    margin-top: 40px;
}

.info-content {
    margin-top: 20px;
}

.formula {
    background-color: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    font-family: 'Courier New', monospace;
    margin: 25px 0;
    border-left: 5px solid #3498db;
    font-size: 1.1rem;
    line-height: 1.8;
}

.formula-explanation {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.formula-explanation ul {
    padding-left: 20px;
    margin-top: 10px;
}

.formula-explanation li {
    margin-bottom: 8px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.info-card {
    background-color: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    border-left: 4px solid #3498db;
    transition: transform 0.3s;
}

.info-card:hover {
    transform: translateY(-5px);
}

.info-card h3 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.safety-note {
    margin-top: 40px;
    padding: 25px;
    background-color: #fff8e1;
    border-radius: 10px;
    border-left: 5px solid #f39c12;
}

.safety-note h3 {
    color: #e67e22;
    display: flex;
    align-items: center;
    gap: 10px;
}

footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px;
    color: #7f8c8d;
    font-size: 0.95rem;
    border-top: 1px solid #e0e0e0;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 600;
    color: #2c3e50;
}

.footer-note {
    margin-top: 15px;
    font-size: 0.85rem;
    color: #95a5a6;
    font-style: italic;
}

@media (max-width: 1100px) {
    .calculator-container {
        flex-direction: column;
    }
    
    .result-cards {
        flex-direction: column;
    }
    
    h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .input-section, .result-section, .info-section {
        padding: 25px;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .result-value {
        font-size: 2.8rem;
    }
}