* {
    box-sizing: border-box;
}

body {
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
    background-color: white;
    max-width: 1200px;
    margin: 20px auto;
}

/*Hlavicka*/

header {
    margin: 30px 0;
}

header img {
    display: block;
    margin: 0 auto;
    width: 150px;
}

/*Navigacne menu*/

nav {
    border-width: 5px 0; 
    border-style: ridge;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

nav li {
    display: inline-block;
}

nav a {
    text-decoration: none;
    color: black;
    display: block;
    padding: 14px 16px;
    text-transform: uppercase;
    font-weight: bold;
}

nav a:hover {
    background-color: black;
    color: yellow;
}

/*Pata*/

footer {
    max-width: 600px;
    margin: 0 auto;
    border-top-width: 5px; 
    border-top-style: ridge;
    text-align: center;
    font-size: 0.8em;
    clear: both;
}

footer p {
    margin: auto;
    padding: 10px;
}

/*Obsah*/

main {
    margin: 50px auto;
    max-width: 1000px;
    padding: 0 5%;
    text-align: center;
}

h1 {
    font-weight: bold;
    text-decoration: underline;
    text-transform: uppercase;
    font-size: 1.5em;
    margin: 20px;
    padding: 0;
}

h2 {
    margin: 5px;
    padding: 0;
    font-size: 1.3em;
}

h3 {
    color: #737373;
    margin: 0;
    padding: 0;
    font-size: 1em;
}

main p {
    padding: 0;
    text-align: justify;
    margin: 10px 30px;
}

p.details {
    color: #737373;
    margin: 0;
    padding: 0;
    font-size: 1em;
    text-align: center;
    font-weight: bold;
}

main ul {
    padding-left: 15px;
}

main li {
    text-align: justify;
}

main a {
    text-decoration: none;
    color: black;
}

main a:hover {

    background-color: yellow;
}

hr {
    margin-top: 30px;
    margin-bottom: 30px;
}

table, td, th {
    border: 1px solid black;
    border-collapse: collapse;
    text-align: left;
    padding: 5px;
}

table {
    width: 100%;
    margin: 15px auto;
}

th {
    width: 7%;
}

#plan {
    max-width: 600px;
    margin: auto;
}

#plan h3 {
    text-align: left;
    margin: 20px auto 10px;
}

img.profile {
    max-width: 300px;
    border-radius: 10px;
}

img#graf {
    max-width: min(600px, 100%);
}