/* RESET A ZÁKLAD */

* {

    margin: 0;

    padding: 0;

    box-sizing: border-box;

}



body {

    font-family: Arial, sans-serif;

    line-height: 1.6;

    background: #fdfdfd;

    color: #333;

}



html, body {

    height: 100%;

}



/* HEADER */

header {

    display: flex;

    justify-content: space-between;

    align-items: center;

    padding: 15px 30px;

    background: #77A8A8;

    border-bottom: 1px solid black;

    position: sticky;

    top: 0;

    z-index: 100;

}



header .logo {

    display: flex;

    align-items: center;

    font-weight: bold;

}



header .logo img {

    height: 100px;

    margin-right: 10px;

}



header .logo span p {

    font-size: 12px;

    margin-left: 10px;

}



nav ul {

    display: flex;

    list-style: none;

}



nav ul li {

    margin-left: 20px;

}



nav ul li a {

    text-decoration: none;

    color: #333;

    font-weight: bold;

}



nav ul li a:hover {

    color: #4b7979;

}



/* HAMBURGER BUTTON */

.hamburger {

    display: none;

    flex-direction: column;

    justify-content: space-between;

    width: 28px;

    height: 21px;

    cursor: pointer;

    z-index: 150;

}



.hamburger span {

    display: block;

    height: 3px;

    background: #333;

    border-radius: 3px;

    transition: all 0.3s ease;

}



/* MOBILE MENU */

@media (max-width: 768px) {

    .hamburger {

        display: flex;

    }



    nav {

        position: fixed;

        top: -100%; /* skryté nahoře */

        left: 0;

        width: 100%;

        height: 100vh;

        background: rgba(119, 168, 168, 0.95);

        flex-direction: column;

        justify-content: center;

        align-items: center;

        transition: top 0.4s ease;

        z-index: 120;

    }



    nav ul {

        flex-direction: column;

        gap: 25px;

        margin-top: 30%;

    }



    nav ul li a {

        color: black;

        font-size: 20px;

        font-weight: bold;

    }



    nav.active {

        top: 0; /* vysunuté dolů */

    }

}



/* HAMBURGER ANIMACE */



.hamburger.active span:nth-child(1) {

    transform: rotate(45deg) translate(5px, 5px);

}



.hamburger.active span:nth-child(2) {

    opacity: 0;

}



.hamburger.active span:nth-child(3) {

    transform: rotate(-45deg) translate(6px, -6px);

}





/* ZATAŽENÍ ZA OBSAH (nepovinné) */

.menu-overlay {

    display: none;

    position: fixed;

    inset: 0;

    background: rgba(0,0,0,0.4);

    z-index: 110;

    transition: opacity 0.3s ease;

}



.menu-overlay.active {

    display: block;

}