:root {
    --primary-color: #002D62;
    --secondary-color: #0076CE;
    --dark-text: #333333;
    --light-text: #ffffff;
    --light-bg: #f8f9fa;
    --font-family-sans-serif: 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font-family-sans-serif);
    color: var(--dark-text);
    line-height: 1.6;
}

/* Header and Navigation */
.navbar {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand img {
    height: 40px;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-text);
}

.nav-link:hover {
    color: var(--primary-color);
}

.btn-kontakt {
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
}

.btn-kontakt:hover {
    background-color: #00245a;
    color: white;
}

/* Hero Section */
.hero {
    padding: 5rem 0;
}

.hero h1 {
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero h1 span {
    color: var(--primary-color);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.hero-image {
    max-width: 100%;
    height: auto;
}

/* Category Buttons */
.category-buttons {
    margin: 2rem 0;
}

.btn-category {
    background-color: var(--secondary-color);
    color: white;
    border-radius: 25px;
    padding: 0.8rem 2rem;
    margin: 0.5rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

.btn-category:hover {
    background-color: #0064b0;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    color: white;
}

/* Content Sections */
.section {
    padding: 4rem 0;
}

.section-title {
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.section-subtitle {
    font-weight: 600;
    color: var(--dark-text);
}

/* Calculator */
.calculator-form {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.calculator-result {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    margin-top: 2rem;
}

/* Contact Form */
.contact-form {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(0, 45, 98, 0.25);
}

.btn-submit {
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    padding: 0.8rem 2rem;
    font-weight: 500;
}

.btn-submit:hover {
    background-color: #00245a;
}

/* Footer */
.footer {
    background-color: #001a42;
    color: white;
    padding: 3rem 0;
}

.footer a {
    color: white;
    text-decoration: none;
}

.footer a:hover {
    color: var(--secondary-color);
}

.footer-logo {
    height: 30px;
    margin-bottom: 1rem;
}

/* Responsive adjustments */
@media (max-width: 991.98px) {
    .hero {
        text-align: center;
        padding: 3rem 0;
    }
    
    .hero-image {
        margin-top: 2rem;
    }
}

@media (max-width: 767.98px) {
    .section {
        padding: 3rem 0;
    }
    
    .btn-category {
        display: block;
        width: 100%;
        margin: 0.5rem 0;
    }
}

@media (max-width: 575.98px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
}