body{
    margin:0;
    font-family:Arial, Helvetica, sans-serif;
    overflow-x:hidden;
    box-sizing:border-box;
}

*,
*::before,
*::after{
    box-sizing:inherit;
}

/* logo levy roh */
.logo{
    width:204px;
    position:absolute;
    top:0;
    left:0;
    z-index:10;
    cursor:pointer;
}

/* horni cerny pruh */
.hornipruh{
    position:absolute;
    top:0;
    left:200px;
    width:calc(100% - 200px);
    height:115px;
    background-color:black;
    z-index:5;
}

/* sedy pruh */
.sedypruh{
    width:100%;
    height:35px;
    background-color:#444;
    color:white;
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:0 30px;
    font-size:14px;
    font-weight:bold;
}

.sedypruh a{
    color:white;
    text-decoration:none;
    font-weight:bold;
}

/* leva cast v sedem pruhu */
.kontakt{
    display:flex;
    align-items:center;
    gap:40px;
}

.kontakt a{
    color:white;
    text-decoration:none;
    font-weight:bold;
}

.social{
    display:flex;
    align-items:center;
    gap:20px;
    margin-right:35px;
}

.social a{
    width:30px;
    height:30px;
    border:2px solid white;
    display:flex;
    align-items:center;
    justify-content:center;
    color:white;
    text-decoration:none;
    transition:0.3s;
}

.social a:hover{
    background:#ff2a2a;
    border-color:#ff2a2a;
}

/* menu v cernem pruhu */
.menu{
    display:flex;
    align-items:center;
    gap:70px;
    height:80px;
    padding-left:40px;
}

/* odkazy menu */
.menu a{
    color:white;
    text-decoration:none;
    font-size:22px;
    font-weight:700;
    letter-spacing:1px;
    padding:0 20px;
    height:80px;
    display:flex;
    align-items:center;
    transition:0.3s;
}

.menu a:hover{
    background-color:#ff2a2a;
    color:white;
}

/* aktivni stranka */
.menu a.aktivni{
    background-color:#ff2a2a;
    color:white;
}

/* galerie */
.galerie-stranka{
    background:#ffffff;
    min-height:100vh;
}

.galerie-obsah{
    padding:160px 8% 80px 8%;
    max-width:1300px;
    margin:0 auto;
}

.galerie-obsah h1{
    text-align:center;
    font-size:52px;
    margin-bottom:20px;
    text-transform:uppercase;
    color:#222;
}

.galerie-uvod{
    text-align:center;
    font-size:20px;
    color:#555;
    max-width:800px;
    margin:0 auto 50px auto;
    line-height:1.6;
}

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

.galerie-item{
    overflow:hidden;
    border-radius:14px;
    box-shadow:0 8px 25px rgba(0,0,0,0.12);
    transition:0.3s;
    background:#fff;
}

.galerie-item:hover{
    transform:translateY(-6px);
    box-shadow:0 14px 35px rgba(0,0,0,0.18);
}

.galerie-item img{
    width:100%;
    height:280px;
    object-fit:cover;
    display:block;
    cursor:pointer;
    transition:0.3s;
}

.galerie-item:hover img{
    transform:scale(1.05);
}

/* LIGHTBOX */
.lightbox{
    display:none;
    position:fixed;
    inset:0;
    background:rgba(0,0,0,0.88);
    justify-content:center;
    align-items:center;
    z-index:9999;
    padding:30px;
}

.lightbox-img{
    max-width:90%;
    max-height:90%;
    border-radius:10px;
    box-shadow:0 10px 40px rgba(0,0,0,0.6);
}

.lightbox-close{
    position:absolute;
    top:20px;
    right:35px;
    font-size:50px;
    color:white;
    cursor:pointer;
    transition:0.3s;
    line-height:1;
}

.lightbox-close:hover{
    color:#ff2a2a;
}

/* footer */
.footer{
    background:#000;
    color:white;
    text-align:center;
    padding:60px 20px;
    font-size:16px;
    line-height:1.8;
    margin-top:80px;
    border-top:1px solid #333;
}

.footer a{
    color:#ff2a2a;
    text-decoration:none;
    font-weight:bold;
}

.footer a:hover{
    text-decoration:underline;
}

.footer .copyright{
    margin-top:20px;
}

/* tablet */
@media (max-width:1000px){
    .galerie-grid{
        grid-template-columns:repeat(2, 1fr);
    }
}

/* mobil */
@media (max-width:768px){

    .hornipruh{
        left:0;
        width:100%;
        position:relative;
        height:auto;
    }

    .logo{
        position:relative;
        display:block;
        margin:0 auto;
        left:auto;
        top:auto;
    }

    .sedypruh{
        flex-direction:column;
        gap:10px;
        height:auto;
        padding:15px;
        text-align:center;
    }

    .kontakt{
        flex-direction:column;
        gap:10px;
    }

    .social{
        margin-right:0;
    }

    .menu{
        flex-wrap:wrap;
        justify-content:center;
        gap:10px;
        height:auto;
        padding:15px;
    }

    .menu a{
        height:auto;
        padding:12px 16px;
        font-size:18px;
    }

    .galerie-obsah{
        padding:40px 20px 60px 20px;
    }

    .galerie-obsah h1{
        font-size:36px;
    }

    .galerie-uvod{
        font-size:18px;
    }

    .galerie-grid{
        grid-template-columns:1fr;
    }

    .galerie-item img{
        height:240px;
    }

    .lightbox-close{
        top:15px;
        right:20px;
        font-size:42px;
    }
}