:root {
    --primary: #2c5aa0;
    --secondary: #8b0000;
    --light: #f8f9fa;
    --dark: #343a40;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
}

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

body {
    background-color: #f5f5f5;
    color: var(--dark);
    line-height: 1.6;
}

header {
    background: linear-gradient(135deg, var(--primary), #1a3a6d);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.intro {
    text-align: center;
    margin-bottom: 3rem;
    padding: 0 1rem;
}

.intro p {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 1.5rem;
}

.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .calculator-container {
        grid-template-columns: 1fr;
    }
}

.calculator {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease;
}

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

.calculator h2 {
    color: var(--primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

input, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border 0.3s;
}

input:focus, select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 2px rgba(44, 90, 160, 0.2);
}

.btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s;
    width: 100%;
}

.btn:hover {
    background-color: #1a3a6d;
}

.result {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 5px;
    text-align: center;
    font-weight: 600;
    display: none;
}

.result.success {
    background-color: rgba(40, 167, 69, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.result.warning {
    background-color: rgba(255, 193, 7, 0.1);
    border: 1px solid var(--warning);
    color: #856404;
}

.result.danger {
    background-color: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.standards {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 3rem;
}

.standards h2 {
    color: var(--primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.tables-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .tables-container {
        grid-template-columns: 1fr;
    }
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.faq-section {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.faq-section h2 {
    color: var(--primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.faq-item {
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #eee;
    padding-bottom: 1.5rem;
}

.faq-question {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
}

.faq-answer {
    display: none;
    padding-top: 0.5rem;
}

.faq-item.active .faq-question::after {
    content: '-';
}

.faq-item.active .faq-answer {
    display: block;
}

footer {
    background-color: var(--dark);
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 3rem;
}

.disclaimer {
    background-color: rgba(255, 193, 7, 0.1);
    border: 1px solid var(--warning);
    border-radius: 5px;
    padding: 1rem;
    margin-top: 1.5rem;
    font-size: 0.9rem;
}