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

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #d32f2f;
}

.calculator {
    background: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.input-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 15px;
}

label {
    margin-bottom: 5px;
    font-weight: bold;
}

input {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.parameter-group {
    margin-top: 20px;
    padding: 15px;
    background-color: #f9f9f9;
    border-radius: 8px;
    border-left: 4px solid #d32f2f;
}

h3 {
    margin-bottom: 15px;
    color: #d32f2f;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #d32f2f;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    margin: 20px 0;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #b71c1c;
}

.button-container {
    display: flex;
    gap: 15px;
}

.button-container button {
    margin: 20px 0;
}

#pdf-button {
    background-color: #2f7dd3;
}

#pdf-button:hover {
    background-color: #1c5fb7;
}

.results {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px dashed #ddd;
}

.result-section {
    margin-top: 15px;
    padding: 15px;
    background-color: #f9f9f9;
    border-radius: 8px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
}

.result-item.total {
    font-weight: bold;
    margin-top: 10px;
    border-top: 2px solid #ddd;
    border-bottom: none;
    padding-top: 12px;
}

.result-item span:first-child {
    flex: 2;
}

.result-item span:nth-child(2) {
    flex: 1;
    text-align: right;
    font-weight: bold;
}

.result-item span:last-child {
    flex: 0.2;
    text-align: right;
}

.water-sections {
    margin-top: 10px;
    padding: 10px;
    background-color: #f0f7ff;
    border-radius: 6px;
    border-left: 4px solid #2f7dd3;
}

.water-sections h4 {
    color: #2f7dd3;
    margin-bottom: 8px;
}

@media (max-width: 600px) {
    .container {
        padding: 10px;
    }
    
    .calculator {
        padding: 15px;
    }
}