:root {
    /* Přístupné, vysoce kontrastní barvy - Dark slate theme */
    --bg-body: #0f172a;
    /* Velmi tmavé pozadí stránky */
    --bg-panel: #1e293b;
    /* Světlejší pozadí pro panely a hlavičku */
    --bg-hover: #334155;
    /* Pozadí při přejetí myší */

    --text-main: #f8fafc;
    /* Hlavní bílý text */
    --text-muted: #cbd5e1;
    /* Šedý text pro poznámky a popisky */

    --primary: #3b82f6;
    /* Jasně modrá pro akční prvky a odkazy */
    --primary-hover: #2563eb;
    --success: #10b981;
    /* Zelená pro úspěšné hlášky */
    --danger: #ef4444;
    /* Červená pro chyby */

    --border-color: #334155;
    --border-focus: #60a5fa;
    /* Modrá záře při psaní do inputu */
}

/* =========================================
   Základní Reset a Typografie
========================================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
    width: 100%;
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    overscroll-behavior-y: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    margin-bottom: 1rem;
    color: var(--text-main);
    font-weight: 600;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-hover);
}

/* =========================================
   Globální Rozložení (Layout)
========================================= */
.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    padding: 20px;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}

.container-large {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.panel {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* =========================================
   Hlavička a Navigace (Bez JS)
========================================= */
.site-header {
    background-color: var(--bg-panel);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    z-index: 1000;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 60px;
    padding: 0 20px;
}

.mobile-brand {
    display: none;
}

.menu-toggle-checkbox,
.menu-toggle-label {
    display: none;
}

.top-navbar {
    display: flex;
    flex: 1;
    justify-content: space-between;
}

.nav-list {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 10px;
}

.nav-link {
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.nav-link:hover,
.nav-item:focus-within>.nav-link {
    background-color: var(--bg-hover);
}

.pfp-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

.arrow-down {
    font-size: 0.7em;
    opacity: 0.7;
}

.cursor-pointer {
    cursor: pointer;
}

/* Dropdown CSS-only */
.has-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    list-style: none;
    min-width: 220px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s ease;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

.dropdown-right {
    left: auto;
    right: 0;
}

.has-dropdown:hover .dropdown-menu,
.has-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-link {
    display: block;
    color: var(--text-main);
    padding: 10px 20px;
}

.dropdown-link:hover,
.dropdown-link:focus {
    background-color: var(--primary);
    color: white;
}

/* Mobilní navigace */
@media (max-width: 768px) {
    .header-container {
        padding: 15px 20px;
    }

    .mobile-brand {
        display: block;
        font-weight: bold;
        font-size: 1.25rem;
        color: var(--text-main);
    }

    .menu-toggle-label {
        display: block;
        cursor: pointer;
    }

    .menu-toggle-label img {
        height: 28px;
        filter: invert(1);
    }

    .top-navbar {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--bg-panel);
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-in-out;
    }

    .menu-toggle-checkbox:checked~.header-container .top-navbar {
        max-height: 600px;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px 20px;
        width: 100%;
    }

    .nav-list.nav-right {
        border-top: 1px solid var(--border-color);
        padding-top: 15px;
        margin-top: 5px;
    }

    .nav-item,
    .nav-link {
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        padding-left: 15px;
        background: transparent;
    }
}

/* =========================================
   Patička (Footer)
========================================= */
footer {
    background: var(--bg-panel);
    border-top: 1px solid var(--border-color);
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer p {
    margin-bottom: 5px;
}

/* =========================================
   Komponenty: Upozornění (Alerts)
========================================= */
.alert {
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-weight: 500;
    text-align: center;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.2);
    color: #34d399;
    border: 1px solid var(--success);
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.2);
    color: #f87171;
    border: 1px solid var(--danger);
}

.alert-big {
    font-size: 1.25rem;
}

/* =========================================
   Komponenty: Formuláře
========================================= */
.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-main);
}

.form-text {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    background-color: var(--bg-body);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control::placeholder {
    color: #64748b;
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

fieldset.form-fieldset {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 25px;
    background: var(--bg-panel);
}

fieldset.form-fieldset legend {
    padding: 0 10px;
    font-weight: 600;
    color: var(--primary);
}

/* =========================================
   Komponenty: Tlačítka (Buttons)
========================================= */
.btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 12px 20px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    text-align: center;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--primary-hover);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover,
.btn-outline:focus {
    background-color: var(--bg-hover);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.9rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-group {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

/* =========================================
   Komponenty: Tabulky
========================================= */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    white-space: nowrap;
    /* Zabrání zalamování na mobilu */
}

.table th {
    background-color: var(--bg-hover);
    color: var(--text-muted);
    font-weight: 600;
    padding: 12px 15px;
    border-bottom: 2px solid var(--border-color);
}

.table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

.table tbody tr:hover {
    background-color: rgba(255, 255, 255, 0.02);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* =========================================
   Index Page (Hero & Grid)
========================================= */
.hero {
    text-align: center;
    padding: 60px 20px;
    background-color: var(--bg-panel);
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--primary);
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-muted);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.gallery-item {
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

.gallery-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}


























/* =========================================
   Prohlížeč (Viewer) - OpenSeadragon
========================================= */
.wrapper-asset {
    display: flex;
    height: calc(100vh - 61px);
    /* Výška okna mínus hlavička */
    overflow: hidden;
}

.photo-section {
    flex: 1;
    background-color: #000;
    /* Klasické černé pozadí pro fotky */
    position: relative;
}

.info-section {
    width: 350px;
    min-width: 350px;
    background-color: var(--bg-panel);
    border-left: 1px solid var(--border-color);
    padding: 20px;
    overflow-y: auto;
}

/* Na mobilu se panely přeskládají pod sebe */
@media (max-width: 768px) {
    .wrapper-asset {
        flex-direction: column;
        height: auto;
        min-height: calc(100vh - 61px);
    }

    .photo-section {
        min-height: 60vh;
    }

    .info-section {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }
}