:root {

    --primary: #FF7B00;

    --primary-dark: #cc6200;

    --dark: #1E293B;

    --light-bg: #F8FAFC;

    --white: #FFFFFF;

    --text: #334155;

}



* {

    margin: 0;

    padding: 0;

    box-sizing: border-box;

}



html {

    scroll-behavior: smooth;

}



body {

    font-family: 'Open Sans', sans-serif;

    color: var(--text);

    line-height: 1.6;

    background-color: var(--light-bg);

}



h1, h2, h3 {

    font-family: 'Montserrat', sans-serif;

    color: var(--dark);

}



a {

    text-decoration: none;

    color: inherit;

}



.container {

    max-width: 1200px;

    margin: 0 auto;

    padding: 0 20px;

}



.text-center { 

    text-align: center; 

}



header {

    background-color: var(--white);

    box-shadow: 0 2px 10px rgba(0,0,0,0.05);

    position: sticky;

    top: 0;

    z-index: 100;

}



.header-container {

    max-width: 95%;

    margin: 0 auto;

    padding: 0 20px;

    display: flex;

    justify-content: space-between;

    align-items: center;

    height: 80px;

}



.logo-placeholder h1 {

    font-size: 26px;

    font-weight: 900;

    letter-spacing: 1px;

}



.logo-placeholder span {

    color: var(--primary);

}



nav {

    display: flex;

    align-items: center;

}



nav a {

    margin-left: 30px;

    font-weight: 600;

    transition: color 0.3s;

}



nav a:hover {

    color: var(--primary);

}



.btn-nav {

    background-color: var(--primary);

    color: var(--white) !important;

    padding: 10px 20px;

    border-radius: 5px;

}



.btn-nav:hover {

    background-color: var(--primary-dark);

}



.hamburger {

    display: none;

    font-size: 28px;

    background: none;

    border: none;

    cursor: pointer;

    color: var(--dark);

}



.hero {

    background: linear-gradient(rgba(30, 41, 59, 0.8), rgba(30, 41, 59, 0.8)), url('img/hlavni-stavba.jpg') no-repeat center center/cover;

    height: 80vh;

    min-height: 500px;

    display: flex;

    align-items: center;

    color: var(--white);

    text-align: center;

}



.hero h2 {

    color: var(--white);

    font-size: 3.5rem;

    font-weight: 900;

    margin-bottom: 20px;

    line-height: 1.2;

}



.hero p {

    font-size: 1.2rem;

    max-width: 700px;

    margin: 0 auto 30px auto;

    opacity: 0.9;

}



.btn-primary {

    display: inline-block;

    background-color: var(--primary);

    color: var(--white);

    padding: 15px 35px;

    font-size: 1.1rem;

    font-weight: bold;

    border-radius: 5px;

    text-transform: uppercase;

    transition: background 0.3s, transform 0.2s;

}



.btn-primary:hover {

    background-color: var(--primary-dark);

    transform: translateY(-2px);

}



.services {

    padding: 80px 0;

}



.section-title {

    text-align: center;

    font-size: 2.5rem;

    margin-bottom: 50px;

    position: relative;

    color: var(--dark);

}



.section-title::after {

    content: '';

    display: block;

    width: 60px;

    height: 4px;

    background-color: var(--primary);

    margin: 15px auto 0 auto;

}



.grid-3 {

    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 30px;

}



.card {

    background: var(--white);

    border-radius: 8px;

    overflow: hidden;

    box-shadow: 0 5px 15px rgba(0,0,0,0.08);

    transition: transform 0.3s, box-shadow 0.3s;

}



.card:hover {

    transform: translateY(-5px);

    box-shadow: 0 10px 25px rgba(0,0,0,0.15);

}



.card img {

    width: 100%;

    height: 250px;

    object-fit: cover;

    display: block;

}



.card-body {

    padding: 30px;

}



.card-body h3 {

    font-size: 1.4rem;

    margin-bottom: 15px;

}



.stats {

    background-color: var(--primary);

    color: var(--white);

    padding: 60px 0;

}



.grid-4 {

    display: grid;

    grid-template-columns: repeat(4, 1fr);

    gap: 20px;

    text-align: center;

}



.stat-number {

    display: block;

    font-size: 3rem;

    font-weight: 900;

    font-family: 'Montserrat', sans-serif;

    margin-bottom: 5px;

}



.stat-text {

    font-size: 1.1rem;

    font-weight: 600;

}



.features {

    background-color: var(--dark);

    color: var(--white);

    padding: 80px 0;

}



.features .section-title {

    color: var(--white);

}



.features-text {

    max-width: 800px;

    margin: 0 auto;

    font-size: 1.1rem;

}



.features-text ul {

    list-style: none;

    margin-top: 20px;

}



.features-text li {

    margin-bottom: 15px;

    font-size: 1.2rem;

    padding-left: 10px;

    border-left: 3px solid var(--primary);

}



.gallery-section {

    padding: 80px 0;

    background-color: var(--white);

}



/* TADY JE TA OPRAVENÁ, PŘESNĚ VYCENTROVANÁ MŘÍŽKA */

.gallery-grid {

    display: grid;

    grid-template-columns: repeat(3, 1fr);

    gap: 20px;

    grid-auto-rows: 250px;

    justify-content: center;

    align-items: center;

}



.gallery-img {

    width: 100%;

    height: 100%;

    object-fit: cover;

    border-radius: 8px;

    cursor: pointer;

    display: block;

    transition: transform 0.3s, filter 0.3s;

}



.gallery-img:hover {

    transform: scale(1.02);

    filter: brightness(0.9);

}



.lightbox {

    display: none;

    position: fixed;

    z-index: 1000;

    left: 0;

    top: 0;

    width: 100%;

    height: 100%;

    background-color: rgba(0,0,0,0.9);

    align-items: center;

    justify-content: center;

}



.lightbox-content {

    max-width: 80%;

    max-height: 80vh;

    border-radius: 5px;

    box-shadow: 0 0 20px rgba(0,0,0,0.5);

    animation: fadeIn 0.3s ease;

}



@keyframes fadeIn {

    from { opacity: 0; transform: scale(0.9); }

    to { opacity: 1; transform: scale(1); }

}



.close-lightbox {

    position: absolute;

    top: 30px;

    right: 40px;

    color: white;

    font-size: 40px;

    font-weight: bold;

    cursor: pointer;

}



.prev-btn, .next-btn {

    position: absolute;

    top: 50%;

    transform: translateY(-50%);

    background: rgba(0,0,0,0.5);

    color: white;

    border: none;

    font-size: 30px;

    padding: 15px 20px;

    cursor: pointer;

    border-radius: 50%;

    transition: background 0.3s;

}



.prev-btn:hover, .next-btn:hover {

    background: var(--primary);

}



.prev-btn {

    left: 20px;

}



.next-btn {

    right: 20px;

}



.contact {

    padding: 80px 0;

}



.contact-boxes {

    display: flex;

    justify-content: center;

    gap: 40px;

    margin-top: 40px;

    flex-wrap: wrap;

}



.contact-box {

    background: var(--white);

    padding: 30px;

    border-radius: 8px;

    min-width: 250px;

    box-shadow: 0 5px 15px rgba(0,0,0,0.05);

    border-top: 4px solid var(--primary);

}



.contact-box span {

    display: block;

    font-size: 0.9rem;

    color: #64748b;

    margin-bottom: 10px;

    text-transform: uppercase;

}



.contact-box strong {

    font-size: 1.2rem;

    color: var(--dark);

}



.contact-box a:hover {

    color: var(--primary);

}



footer {

    background-color: #0f172a;

    color: #94a3b8;

    padding: 30px 0;

}



/* RESPONZIVITA PRO MENŠÍ OBRAZOVKY A TABLETY */

@media (max-width: 900px) {

    .grid-3 {

        grid-template-columns: 1fr;

    }

    .grid-4 {

        grid-template-columns: 1fr 1fr;

    }

    .hero h2 {

        font-size: 2.5rem;

    }

    

    .hamburger {

        display: block;

    }

    

    nav {

        display: none;

        position: absolute;

        top: 80px;

        left: 0;

        width: 100%;

        background-color: var(--white);

        flex-direction: column;

        padding: 20px 0;

        box-shadow: 0 10px 10px rgba(0,0,0,0.1);

    }

    

    nav.active {

        display: flex;

    }

    

    nav a {

        margin: 15px 0;

        font-size: 1.2rem;

    }

    

    .lightbox-content {

        max-width: 95%;

    }

    

    /* Na tabletu uděláme 2 perfektní sloupce */

    .gallery-grid {

        grid-template-columns: repeat(2, 1fr);

    }

}



/* RESPONZIVITA PRO MOBILY */

@media (max-width: 600px) {

    .grid-4 {

        grid-template-columns: 1fr;

    }

    .hero h2 {

        font-size: 2rem;

    }

    .prev-btn, .next-btn {

        padding: 10px 15px;

        font-size: 20px;

    }

    

    /* Na mobilu uděláme 1 sloupec */

    .gallery-grid {

        grid-template-columns: 1fr;

    }

}