:root {
    --color-primary: #004a99;
    --color-secondary: #f39c12;
    --color-dark: #333;
    --color-light: #f4f4f4;
    --color-white: #ffffff;
    --color-text: #555;
    --font-main: Arial, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --container-width: 1100px;
    --header-height: 80px;
}

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

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

html {
    scroll-behavior: smooth;
}

h1, h2, h3, h4 {
    color: var(--color-dark);
    line-height: 1.3;
    margin-bottom: 15px;
}

h1 { font-size: 2.986rem; }
h2 { font-size: 2.488rem; text-align: center; margin-bottom: 40px; }
h3 { font-size: 2.074rem; }
h4 { font-size: 1.728rem; }

p {
    margin-bottom: 20px;
}

a {
    text-decoration: none;
    color: var(--color-primary);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: auto;
    overflow: hidden;
}

section {
    padding: 60px 0;
}

/* placeholder pro obrázky */
.img-placeholder {
    width: 100%;
    background: #ccc;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #888;
    font-style: italic;
    border-radius: 5px;
    font-size: 0.9rem;
    text-align: center;
    padding: 20px;
}

/* Tlačítka */
.btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    border-color: var(--color-secondary);
}

.btn-primary:hover {
    background-color: #e88f0b;
    border-color: #e88f0b;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* Hlavička a Navigace */
header {
    background: var(--color-white);
    padding: 0 20px;
    height: var(--header-height);
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0;
}


.logo {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 5px 0;
}

.logo-img {
    height: 100%;
    width: auto;
    max-height: 100px;
    object-fit: contain;
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-links li {
    margin-left: 25px;
}

.nav-links li a {
    font-weight: bold;
    color: var(--color-dark);
    transition: color 0.3s ease;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--color-primary);
}

.nav-links .btn {
    padding: 8px 18px;
    font-size: 0.9rem;
}

/* burgir */
.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.8rem;
    color: var(--color-dark);
}

@media (max-width: 992px) {
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        background: var(--color-white);
        height: calc(100vh - var(--header-height));
        width: 100%;
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 40px;
        transform: translateX(100%);
        transition: transform 0.5s ease-in-out;
    }

    .nav-links li {
        margin: 20px 0;
    }
    
    .nav-links li a {
        font-size: 1.2rem;
    }

    .nav-links.nav-active {
        transform: translateX(0);
    }

    .hamburger {
        display: block;
    }
}


/* Hero Sekce */
.hero {
    background: linear-gradient(rgba(0, 58, 122, 0.7), rgba(0, 58, 122, 0.7)), url('https://via.placeholder.com/1920x1080/444/888?text=SB+Stavby+Hero+Image');
    background-size: cover;
    background-position: center;
    color: var(--color-white);
    text-align: center;
    padding: 100px 0;
}

.hero h1 {
    color: var(--color-white);
    font-size: 3.2rem;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 650px;
    margin: 0 auto 30px auto;
}

.hero .btn-secondary {
    color: var(--color-white);
    border-color: var(--color-white);
    margin-left: 15px;
}

.hero .btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
}

/* Přehled služeb */
.services-overview {
    background: var(--color-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    text-align: center;
}

.service-card {
    background: var(--color-white);
    padding: 30px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.service-card .icon {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.service-card h3 {
    margin-bottom: 10px;
}

/* Přidá světle šedé pozadí pro celou sekci */
.why-us {
    background-color: var(--color-light);
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.why-us-item {
    padding: 20px;
}

.why-us-item .icon {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 15px;
}

.why-us-item h3 {
    color: var(--color-primary);
}

/* Vybrané reference */
.portfolio-preview {
    background: var(--color-light);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.portfolio-item {
    background: var(--color-white);
    border: 1px solid #ddd;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    transition: box-shadow 0.3s ease;
}

.portfolio-item:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.portfolio-item .img-placeholder {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
    border-radius: 0;
}

.portfolio-item-content {
    padding: 20px;
}

.portfolio-item-content h3 {
    margin-bottom: 10px;
}

.portfolio-item-content .tag {
    display: inline-block;
    background: var(--color-light);
    color: var(--color-primary);
    font-size: 0.8rem;
    padding: 5px 10px;
    border-radius: 3px;
    margin-bottom: 15px;
}

/* O nás (stručně) */
.about-preview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-preview .img-placeholder {
    height: 400px;
}

.about-preview .team-member-small {
    display: flex;
    align-items: center;
    margin-top: 20px;
}

.about-preview .team-member-small .img-placeholder {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 20px;
}

/* Proces spolupráce */
.process {
    background: var(--color-white);
}
.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    text-align: center;
}

.process-step {
    padding: 20px;
}

.process-step .step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: bold;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

/* Recenze */
.reviews-preview {
    background: var(--color-white);
}
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.review-card {
    background: var(--color-light);
    padding: 30px;
    border-radius: 5px;
    border-left: 5px solid var(--color-primary);
}

.review-card p {
    font-style: italic;
    font-size: 1.1rem;
}

.review-card .author {
    font-weight: bold;
    color: var(--color-dark);
    margin-top: 15px;
}

/* Hlavní CTA Blok */
.main-cta {
    background: var(--color-primary);
    color: var(--color-white);
    text-align: center;
    padding: 80px 0;
}

.main-cta h2 {
    color: var(--color-white);
    font-size: 2.5rem;
}

.main-cta p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto 30px auto;
}

.main-cta .btn-secondary {
    font-size: 1.2rem;
    padding: 15px 30px;
    color: var(--color-white);
    border-color: var(--color-white);
}

.main-cta .btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-primary);
}

/* Patička */
footer {
    background: var(--color-dark);
    color: #aaa;
    padding: 60px 0 20px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-grid h4 {
    color: var(--color-white);
    margin-bottom: 15px;
}

.footer-grid ul li {
    margin-bottom: 10px;
}

.footer-grid ul li a {
    color: #aaa;
    transition: color 0.3s ease;
}

.footer-grid ul li a:hover {
    color: var(--color-white);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid #555;
    padding-top: 20px;
    font-size: 0.9rem;
}


.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    text-align: center;
}

.team-member {
    background: var(--color-light);
    padding: 20px;
    border-radius: 5px;
}

.team-member .img-placeholder {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin: 0 auto 20px auto;
}

.filter-buttons {
    text-align: center;
    margin-bottom: 40px;
}

.filter-buttons .btn {
    margin: 5px;
}

.service-detail-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.service-sidebar .widget {
    background: var(--color-light);
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.service-sidebar .widget ul li {
    margin-bottom: 10px;
}

.service-sidebar .widget ul li a {
    font-weight: bold;
}
.service-sidebar .widget ul li a.active {
    color: var(--color-secondary);
}

/* STRÁNKA KONTAKT A POPTÁVKA */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    font-family: var(--font-main);
}

.form-group textarea {
    min-height: 150px;
}

.form-group-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group-checkbox input {
    width: auto;
}

/* Styly pro slider */
.slider-container {
    position: relative;
    width: 100%;
    height: 250px;
    overflow: hidden;
}

.slider-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.8s ease-in-out;
}

.slider-slide.active {
    opacity: 1;
}

.slider-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.portfolio-item.hidden {
    display: none;
}

.footer-grid .footer-column p a {
    color: #aaa;
    transition: color 0.3s ease;
}

.footer-grid .footer-column p a:hover {
    color: var(--color-white);
}

@media (max-width: 992px) {
    h1 { font-size: 2.5rem; }
    .hero h1 { font-size: 2.8rem; }
    
    .portfolio-grid { grid-template-columns: repeat(2, 1fr); }
    .process-grid { grid-template-columns: repeat(2, 1fr); }
    .about-preview { grid-template-columns: 1fr; }
    .about-preview .img-placeholder { height: 300px; margin-bottom: 30px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-layout { grid-template-columns: 1fr; }
    .service-detail-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .hero .btn {
        display: block;
        width: 100%;
        margin-left: 0;
    }
    
    .hero .btn:not(:last-child) {
        margin-bottom: 15px;
    }
    
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    .hero h1 { font-size: 2.5rem; }

    .portfolio-grid { grid-template-columns: 1fr; }
    .process-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
    margin-top: 20px;
}

.gallery-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #ddd;
}

.gallery-thumbnail:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    padding: 20px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.9);
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 85vh;
}

.modal-caption {
    margin: 15px auto 0 auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    font-size: 1.1rem;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.modal-close:hover,
.modal-close:focus {
    color: #bbb;
}

.modal-prev,
.modal-next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    padding: 16px;
    margin-top: -50px;
    color: white;
    font-weight: bold;
    font-size: 30px;
    transition: 0.3s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
    -webkit-user-select: none;
}

.modal-next {
    right: 0;
    border-radius: 3px 0 0 3px;
}
.modal-prev {
    left: 0;
}

.modal-prev:hover,
.modal-next:hover {
    background-color: rgba(255,255,255,0.2);
}

.progress-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    margin: 20px auto 40px auto;
    width: 90%;
    max-width: 600px;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 100%;
    background: var(--color-light);
    z-index: -1;
}

.progress-bar-fill {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 0%;
    background: var(--color-primary);
    z-index: -1;
    transition: width 0.4s ease;
}

.progress-step {
    width: 50px;
    height: 50px;
    background: var(--color-light);
    border: 3px solid var(--color-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    color: #999;
    font-weight: bold;
    transition: all 0.4s ease;
    text-align: center;
    padding: 5px;
}

.progress-step.active {
    border-color: var(--color-primary);
    background: var(--color-white);
    color: var(--color-primary);
}

.form-step {
    display: none;
    animation: fadeIn 0.5s ease;
}

.form-step.active {
    display: block;
}

.form-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}