/* vseobecny reset a box-sizing */
html {
    box-sizing: border-box;
    font-size: 16px;
}

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

/* telo stranky */
body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background-color: #ffffff;
    /* biele pozadie */
    color: #111827;
    /* tmavosivý text */
    line-height: 1.6;
}

/* spolocna sirka pre hlavne bloky */
header,
nav,
main,
footer {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/*  hlavicka */

header {
    background-color: #3257b4;
    color: #ffffff;
    padding: 1.2rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

/* logo + nazov stranky */
header .logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
}

header .logo-link img {
    display: block;
    height: 60px;
    width: auto;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
}

/*  navigacia(menu) */

nav {
    background-color: #3257b4;
    padding: 0.3rem 1.5rem;
    margin-bottom: 1.5rem;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0.4rem 0;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

nav li {
    margin: 0;
    padding: 0;
}

nav a {
    display: inline-block;
    background-color: #1e3a8a;
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
    padding: 0.5rem 1.1rem;
    border-radius: 999px;
    transition: background-color 0.3s ease, transform 0.2s ease, color 0.3s ease;
}

/* aktivna polozka menu – class="active" v HTML */
nav a.active {
    background-color: #ffffff;
    color: #0b3c91;
}

/* efekt pri prechode mysou */
nav a:hover {
    background-color: #3b82f6;
    transform: scale(1.05);
}

/* odkazy mimo navigacie (main, aside, footer) */
main a,
aside a,
footer a {
    color: #1565c0;
    text-decoration: none;
    font-weight: 500;
}

main a:hover,
aside a:hover,
footer a:hover {
    text-decoration: underline;
}

/*  hlavny obsah */

main {
    margin: 1.5rem auto 2rem;
}

/* biely obsahovy blok v strede */
article {
    background-color: #ffffff;
    padding: 1.6rem;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

/* nadpisy v clanku */
article h1,
article h2,
article h3 {
    color: #1e3a8a;
    margin-top: 0;
    margin-bottom: 0.6rem;
}

/* bezny text v clanku */
article p {
    margin-bottom: 0.8rem;
}

/* dlhy citat – blockquote */
article blockquote {
    border-left: 4px solid #1e3a8a;
    padding-left: 1rem;
    margin: 1rem 0;
    font-style: italic;
    background-color: #f3f4ff;
}

/* kratky citat – q */
article q {
    font-style: italic;
    color: #1e3a8a;
}

/* zvyraznenie – mark */
article mark {
    background-color: #fffbcc;
    padding: 0 0.2rem;
}

/*  zoznamy (UL, OL, DL) */

ul,
ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.3rem;
}

/* definicny zoznam */
dl {
    margin: 1rem 0;
}

dt {
    font-weight: bold;
    color: #1e3a8a;
}

dd {
    margin: 0 0 0.5rem 1rem;
}

/*  aside - bocny blok */

aside {
    margin-top: 1.5rem;
    padding: 1rem 1.2rem;
    background-color: #e8f2ff;
    border: 1px solid #0055aa;
    border-radius: 6px;
}

aside h3 {
    margin-top: 0;
    color: #003b80;
}

/*  paticka */

footer {
    border-top: 1px solid #e5e7eb;
    text-align: center;
    padding: 0.8rem 1.5rem 1.2rem;
    background-color: #e3f2fd;
    color: #0d47a1;
    font-size: 0.9rem;
}

/*  id a clas  */

/* ukazka ID selektora – uvodna sekcia na hlavnej stranke */
#uvod {
    margin-top: 1.5rem;
}

/* ukazka CLASS selektora – hlavny obrazok v texte */
.obrazok {
    max-width: 60%;
    display: block;
    margin: 1rem auto;
}

/* obrazok obtiekany textom */
.obtekajuci-obrazok {
    float: right;
    max-width: 40%;
    margin: 0 0 1rem 1rem;
}

/* obrazky + hover efekt */

img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* obrazky v tabulke - rovnake rozmery */
table img {
    width: 260px;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

table img:hover {
    transform: scale(1.1);
}

/* tabulka s obrazkami */

table {
    width: 100%;
    border-collapse: collapse;
    text-align: center;
}

table td,
table th {
    padding: 0.8rem;
    vertical-align: middle;
    border: 1px solid #dddddd;
}

/* video */

.video-frame {
    width: 100%;
    max-width: 600px;
    aspect-ratio: 16 / 9;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
}

iframe {
    border: none;
}

/* hlavicka stranky */
.page-header {
    display: flex;
    align-items: center;
}

.logo {
    width: 60px;
}

.site-title {
    margin-left: 10px;
}

.icon {
    width: 90px;
    height: auto;
}