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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #e53935 0%, #e35d5b 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

header p {
    font-size: 0.95rem;
    opacity: 0.95;
}

.calculator {
    padding: 30px;
}

.section {
    margin-bottom: 25px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
}

select,
input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

select:focus,
input:focus {
    outline: none;
    border-color: #667eea;
}

.edit-btn {
    margin-top: 8px;
    padding: 8px 16px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.3s;
}

.edit-btn:hover {
    background: #e0e0e0;
}

.hint {
    margin-top: 6px;
    font-size: 0.85rem;
    color: #666;
    font-style: italic;
}

.calculate-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.result {
    margin-top: 30px;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 12px;
    border: 2px solid #667eea;
}

.result.hidden {
    display: none;
}

.result h2 {
    color: #667eea;
    margin-bottom: 20px;
    text-align: center;
}

.result-grid {
    display: grid;
    gap: 12px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    background: white;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.result-item.highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: 600;
    font-size: 1.1rem;
    border-left: none;
}

.result-item .label {
    font-weight: 500;
}

.result-item .value {
    font-weight: 600;
}

.temperature-info {
    margin-top: 15px;
    padding: 15px;
    background: #fff3cd;
    border-radius: 8px;
    border-left: 4px solid #ffc107;
}

.temperature-info p {
    font-size: 0.9rem;
    color: #856404;
    margin: 0;
}

footer {
    padding: 20px 30px;
    background: #f8f9fa;
    border-top: 1px solid #e0e0e0;
}

footer p {
    font-size: 0.85rem;
    color: #666;
    text-align: center;
    line-height: 1.5;
}

@media (max-width: 600px) {
    .container {
        border-radius: 0;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .calculator {
        padding: 20px;
    }
}