:root {
    --navy: #173b63;
    --blue: #2868a0;
    --light-blue: #eaf3fb;
    --background: #f4f7fb;
    --white: #ffffff;
    --text: #263547;
    --muted: #526579;
    --border: #d8e4ef;
    --accent: #f0b84b;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    line-height: 1.7;
}

/* Hlavni nadpis */

h1 {
    margin: 0;
    padding: 55px 24px 24px;
    background: var(--navy);
    color: var(--white);
    font-size: clamp(28px, 4vw, 42px);
    line-height: 1.25;
    text-align: center;
}

/* Uvodni informace */

h1 + p {
    margin: 0;
    padding: 24px 20px 8px;
    background: var(--navy);
    color: var(--white);
    text-align: center;
}

h1 + p + p,
h1 + p + p ~ p {
    margin: 0;
    padding: 4px 20px;
    background: var(--navy);
    color: var(--white);
    text-align: center;
}

/* Hlavni sekce */

h2 {
    margin: 36px 0 20px;
    padding: 18px 24px;
    background: var(--blue);
    color: var(--white);
    border-left: 6px solid var(--accent);
    font-size: 28px;
}

/* Sekce ZS, MS, SPC a dalsi */

h3 {
    margin: 48px 0 22px;
    padding: 18px 22px;
    background: var(--navy);
    color: var(--white);
    border-radius: 10px;
    font-size: 25px;
    line-height: 1.35;
}

/* Podsekce a nazvy oddeleni */

h4 {
    margin: 28px 20px 12px;
    color: var(--navy);
    font-size: 21px;
    line-height: 1.4;
}

/* Kontakty a obsahove bloky */

p {
    margin: 12px 20px;
    padding: 18px 22px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(23, 59, 99, 0.05);
}

/* Jmena a funkce */

strong {
    color: var(--navy);
    font-weight: 700;
}

/* Odkazy */

a {
    color: #155c99;
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3px;
}

a:hover {
    color: #0c3760;
    text-decoration-thickness: 2px;
}

a:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 4px;
    border-radius: 3px;
}

/* Dokumenty a uzitecne odkazy */

h4 a {
    display: inline-block;
    padding: 12px 18px;
    background: var(--light-blue);
    border: 1px solid #b9d5ed;
    border-radius: 8px;
    text-decoration: none;
}

h4 a:hover {
    background: #d8eafb;
}

/* Mobilni telefony */

@media (max-width: 600px) {
    body {
        font-size: 17px;
        line-height: 1.65;
    }

    h1 {
        padding: 36px 18px 20px;
        font-size: 29px;
    }

    h2 {
        margin-top: 26px;
        padding: 15px 18px;
        font-size: 24px;
    }

    h3 {
        margin-top: 34px;
        padding: 15px 16px;
        font-size: 22px;
    }

    h4 {
        margin: 22px 14px 10px;
        font-size: 19px;
    }

    p {
        margin: 10px 12px;
        padding: 15px 16px;
        overflow-wrap: anywhere;
    }
}

.header-top {
display: flex;
align-items: stretch;
gap: 15px;
padding: 0 20px;
height: 170px;
background: var(--navy);
box-sizing: border-box;
}

.header-top h1 {
    flex: 1;
    margin: 0;
    padding: 20px 0;
    background: transparent;
    text-align: left;
}

.logo {
display: block;
flex: 0 0 150px;
width: 150px;
max-width: 30%;
height: auto;
margin: auto 0;
object-fit: contain;
}

.banner-logo {
display: block;
flex: 1 1 0;
min-width: 0;
width: 0;
align-self: stretch;
height: 100%;
object-fit: fill;
}


/* Hlavní navigace */
.main-nav {
    display: flex;
    justify-content: center;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 0;
    background: var(--navy);
    margin: 0;
    padding: 0 20px;
}

.nav-item {
    position: relative;
}

.nav-item > a {
    display: block;
    padding: 16px 20px;
    color: var(--white);
    text-decoration: none;
    font-weight: 600;
    text-align: center;
}

.nav-item > a:hover {
    background: rgba(255, 255, 255, 0.12);
}

/* Název školy pod hlavičkou */
.header > p {
    background: var(--navy);
    color: var(--white);
    margin: 0;
    padding: 16px 20px;
    text-align: center;
    font-weight: 700;
}

/* Rozbalovací podnabídka navigace */
.dropdown-menu {
display: none;
position: absolute;
top: 100%;
left: 0;
min-width: 260px;
background: var(--navy);
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
z-index: 1000;
}

.dropdown-menu a {
display: block;
padding: 12px 16px;
color: var(--white);
text-decoration: none;
text-align: left;
white-space: nowrap;
}

.dropdown-menu a,
.dropdown-menu a {
background: rgba(255, 255, 255, 0.18);
color: var(--white);
}

.nav-item.dropdown > .dropdown-menu,
.nav-item.dropdown > .dropdown-menu {
display: block;
}


/* Oprava rozbalovací nabídky SPC */
.main-nav .nav-item.dropdown > .dropdown-menu {
    display: none;
}

.main-nav .nav-item.dropdown:hover > .dropdown-menu,
.main-nav .nav-item.dropdown:focus-within > .dropdown-menu {
    display: block;
}

.main-nav .dropdown-menu a:hover,
.main-nav .dropdown-menu a:focus {
    background: rgba(255, 255, 255, 0.18);
}

/* Zvýraznění jednotlivých položek v podnabídce */
.main-nav .dropdown-menu a:hover,
.main-nav .dropdown-menu a:focus {
    background: rgba(255, 255, 255, 0.22);
}


/* Aktuality */
#aktuality {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

#aktuality h2 {
    font-size: 28px;
    margin-bottom: 25px;
    border-bottom: 3px solid var(--navy);
    padding-bottom: 10px;
}

.aktualita {
    background: var(--white);
    border: 1px solid #ddd;
    border-left: 5px solid var(--navy);
    border-radius: 6px;
    padding: 20px;
    margin-bottom: 18px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

.aktualita h3 {
    color: var(--white);
    margin-top: 0;
    margin-bottom: 8px;
}

.aktualita .datum {
    color: #666;
    font-size: 14px;
    margin-top: 0;
    margin-bottom: 12px;
}

.aktualita p:last-child {
    margin-bottom: 0;
    line-height: 1.6;
}