/* ================================================================
   nav.css — Navigace a TOC sidebar pro whatismy-ipaddress.com
   Načítáno na KAŽDÉ stránce (za components.css).
   Obsahuje: fixed header navigace, dropdown, hamburger,
             mobilní menu, dark mode toggle, TOC sidebar.
   ================================================================ */


/* =================================================================
   SEKCE 1 — GLOBÁLNÍ NASTAVENÍ SCROLLU
   Kompenzuje výšku fixed navigace, aby nadpisy nebyly schované.
   ================================================================= */

:root {
    --nav-height: 52px;
    --nav-hover-bg: light-dark(#f0f0f0, #2a2a2a);
}

/* Posune tělo pod fixed nav */
body {
    padding-block-start: var(--nav-height);
}

/* Offset pro anchor linky — nadpis se nezobrazí za navem */
html {
    scroll-padding-top: calc(var(--nav-height) + 32px);
}

/* Záložní offset přímo na anchor elementech */
h1[id], h2[id], h3[id], h4[id], div[id], section[id] {
    scroll-margin-top: calc(var(--nav-height) + 32px);
}


/* =================================================================
   SEKCE 2 — NAV BAR (fixed header)
   ================================================================= */

.site-nav {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: 1000;
    background: var(--bg-container);
    border-block-end: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
}

/* Vnitřní layout nav baru */
.site-nav-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding-block: 0;
    padding-inline: 20px;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    gap: 2px;
}


/* =================================================================
   SEKCE 3 — LOGO
   ================================================================= */

/* Logo = ikona + název webu
   Použití: <a href="/" class="site-nav-logo">
              <img src="/logos/favicon.svg" alt="Logo">
              <span class="site-nav-logo-name">WhatIsMy-IPAddress.com</span>
            </a> */
.site-nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 700;
    font-size: var(--size-14);
    margin-inline-end: 10px;
    flex-shrink: 0;
}

.site-nav-logo img {
    width: 26px;
    height: 26px;
}

.site-nav-logo-name {
    white-space: nowrap;
}


/* =================================================================
   SEKCE 4 — DESKTOP NAVIGAČNÍ ODKAZY
   ================================================================= */

/* Řada odkazů */
.site-nav-links {
    display: flex;
    align-items: center;
    gap: 2px;
    flex: 1;
}

/* Jeden odkaz nebo tlačítko dropdown */
.site-nav-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 11px;
    border-radius: 6px;
    font-size: var(--size-13);
    font-weight: 600;
    color: var(--text-label);
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
    line-height: 1;
}

.site-nav-item:hover {
    background: var(--nav-hover-bg);
    color: var(--accent-color);
}

.site-nav-item:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 6px;
}

/* Malá šipka u dropdown tlačítka */
.nav-arrow {
    font-size: var(--size-11);
    opacity: 0.6;
    transition: transform 0.2s;
}

.site-nav-dropdown.is-open .nav-arrow { transform: rotate(180deg); }


/* =================================================================
   SEKCE 5 — DROPDOWN MENU
   ================================================================= */

.site-nav-dropdown {
    position: relative;
}

/* Panel dropdownu — skrytý, zobrazí se přes JS přidáním .is-open na .site-nav-dropdown */
.site-nav-dropdown-menu {
    display: none;
    position: absolute;
    inset-block-start: calc(100% + 6px);
    inset-inline-start: 0;
    background: var(--bg-container);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: var(--shadow-dropdown);
    padding: 6px;
    min-width: 210px;
    z-index: 1001;
}

.site-nav-dropdown.is-open .site-nav-dropdown-menu {
    display: block;
}

/* Odkaz v dropdownu */
.site-nav-dropdown-menu a {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: var(--size-13);
    font-weight: 500;
    color: var(--text-label);
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}

.site-nav-dropdown-menu a:hover {
    background: var(--nav-hover-bg);
    color: var(--accent-color);
}

.site-nav-dropdown-menu a:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 6px;
}

/* Dropdown ve dvou sloupcích — skupiny s 'col' => 2 v inc/menu.php jdou do pravého.
   Použití: Tools (by se jinak na nižší obrazovce nevešel). */
.site-nav-dropdown.is-open .nav-menu-cols {
    display: flex;
    gap: 6px;
}
.nav-menu-cols .nav-col { min-width: 210px; }
.nav-menu-cols .nav-col + .nav-col {
    border-inline-start: 1px solid var(--border-color);
    padding-inline-start: 6px;
}

/* Oddělovač v dropdownu */
.nav-sep {
    height: 1px;
    background: var(--border-color);
    margin-block: 4px;
    margin-inline: 6px;
}


/* =================================================================
   SEKCE 6 — DARK MODE TOGGLE (vpravo v navu)
   ================================================================= */

/* Kontejner toggle přepínače */
.site-nav-theme {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-inline-start: auto;
    cursor: pointer;
    padding: 5px 10px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
    transition: border-color 0.2s;
    user-select: none;
}

.site-nav-theme:hover {
    border-color: var(--accent-color);
}

.site-nav-theme:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Ikona slunce/měsíce */
.site-nav-theme .theme-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
    display: block;
    color: var(--text-muted);
}

/* Přepínač (pill tvar) */
.site-nav-theme .toggle-switch {
    position: relative;
    width: 36px;
    height: 18px;
    background: var(--toggle-bg);
    border-radius: 20px;
    transition: background 0.3s;
    flex-shrink: 0;
}

/* Kolečko přepínače */
.site-nav-theme .toggle-circle {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 14px;
    height: 14px;
    background: var(--toggle-handle);
    border-radius: 50%;
    transition: left 0.3s;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Posunutí kolečka v dark mode */
[data-theme="dark"] .site-nav-theme .toggle-circle {
    left: 20px;
}


/* =================================================================
   SEKCE 7 — HAMBURGER TLAČÍTKO (mobile)
   ================================================================= */

.site-nav-hamburger {
    display: none;
    align-items: center;
    justify-content: center;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 8px;
    cursor: pointer;
    color: var(--text-main);
    margin-inline-start: 8px;
    flex-shrink: 0;
    transition: border-color 0.2s, color 0.2s;
}

.site-nav-hamburger:hover,
.site-nav-hamburger:focus-visible {
    border-color: var(--accent-color);
    color: var(--accent-color);
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.site-nav-hamburger svg {
    width: 20px;
    height: 20px;
    display: block;
}


/* =================================================================
   SEKCE 8 — MOBILNÍ MENU
   Zobrazí se pod nav barem po kliknutí na hamburger.
   JS přidá .nav-open na .site-nav.
   ================================================================= */

.site-nav-mobile {
    display: none;
    padding-block: 8px 16px;
    padding-inline: 16px;
    border-block-start: 1px solid var(--border-color);
    max-height: calc(100dvh - var(--nav-height));
    overflow-y: auto;
}

/* Popisek sekce v mobilním menu */
.nav-mobile-label {
    font-size: var(--size-11);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    padding: 10px 8px 4px;
}

/* Odkaz v mobilním menu — 12px/14px padding pro snadný zásah palcem */
.site-nav-mobile a {
    display: block;
    padding: 12px 14px;
    font-size: var(--size-14);
    font-weight: 500;
    color: var(--text-label);
    text-decoration: none;
    border-radius: 6px;
    transition: background 0.15s, color 0.15s;
}

.site-nav-mobile a:hover {
    background: var(--nav-hover-bg);
    color: var(--accent-color);
}

.site-nav-mobile a:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
    border-radius: 6px;
}

/* Oddělovač sekcí v mobilním menu */
.nav-mobile-sep {
    height: 1px;
    background: var(--border-color);
    margin-block: 6px;
    margin-inline: 0;
}

/* Zobrazení mobilního menu */
.site-nav.nav-open .site-nav-mobile {
    display: block;
}


/* =================================================================
   SEKCE 9 — RESPONZIVNÍ BREAKPOINT
   Pod 820px zmizí desktop links, zobrazí se hamburger.
   ================================================================= */

@media (max-width: 820px) {
    .site-nav-links {
        display: none;
    }

    .site-nav-hamburger {
        display: flex;
    }

    .site-nav-theme {
        margin-inline-start: auto;
    }

    /* Skryje textový název webu, ponechá jen logo ikonu */
    .site-nav-logo-name {
        display: none;
    }
}


/* =================================================================
   SEKCE 10 — TOC SIDEBAR (Table of Contents)
   Boční panel s obsahem stránky na dlouhých learn-more stránkách.
   Umístění: v .page-layout vedle .container.
   ================================================================= */

/* Sticky kontejner sidebaru */
.toc-sidebar {
    position: sticky;
    inset-block-start: calc(var(--nav-height) + 20px);
    max-height: calc(100dvh - var(--nav-height) - 40px);
    overflow-y: auto;
}

/* Panel TOC */
.toc {
    padding: 18px;
    background: var(--bg-container);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-card);
    font-size: var(--size-13);
    line-height: 1.5;
}

.toc-title {
    font-weight: 700;
    font-size: var(--size-11);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    margin-block-end: 12px;
    padding-block-end: 10px;
    border-block-end: 2px solid var(--border-color);
}

.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin-block-end: 2px;
}

.toc-list a {
    display: block;
    padding: 4px 10px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 6px;
    border-inline-start: 2px solid transparent;
    transition: color 0.15s, background 0.15s, border-color 0.15s;
    font-size: var(--size-12);
}

.toc-list a:hover {
    color: var(--accent-color);
    background: var(--accent-subtle);
    text-decoration: none;
}

.toc-list a.active {
    color: var(--accent-color);
    background: var(--accent-subtle);
    border-inline-start-color: var(--accent-color);
    font-weight: 600;
}

/* h2 položky v TOC — trochu výraznější */
.toc-list .toc-h2 > a {
    font-weight: 600;
    color: var(--text-label);
    font-size: var(--size-12);
    padding: 5px 10px;
    margin-block-start: 5px;
}

.toc-list .toc-h2:first-child > a { margin-block-start: 0; }
.toc-list .toc-h2 > a.active { color: var(--accent-color); }

/* h3 položky v TOC — odsazené */
.toc-sublist {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-sublist li a {
    padding-inline-start: 20px;
    font-size: var(--size-12);
    position: relative;
}

.toc-sublist li a::before {
    content: '';
    position: absolute;
    inset-inline-start: 10px;
    top: 50%;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-muted);
    transform: translateY(-50%);
    transition: background 0.15s;
}

.toc-sublist li a.active::before,
.toc-sublist li a:hover::before {
    background: var(--accent-color);
}

/* Neklikatelný skupinový label v sublistu (např. "The Heavy Hitters") */
.toc-sublist li.toc-group a {
    padding-inline-start: 10px;
    font-size: var(--size-11);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    margin-block-start: 8px;
    pointer-events: none;
    cursor: default;
}
.toc-sublist li.toc-group a::before { display: none; }
.toc-sublist li.toc-group a:hover  { background: none; color: var(--text-muted); }


/* =================================================================
   SEKCE 11 — TOC NA MOBILU (FAB + overlay panel)
   Na mobilu je sidebar skrytý, zobrazí se FAB tlačítko.
   Kliknutím na FAB se zobrazí TOC jako bottom sheet.
   ================================================================= */

/* FAB a overlay jsou na desktopu skryté */
.toc-fab     { display: none; }
.toc-overlay { display: none; }

@media (max-width: 980px) {
    /* Skryj sidebar na mobilu */
    .toc-sidebar { display: none; }

    /* FAB tlačítko v pravém dolním rohu */
    .toc-fab {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        inset-block-end: 24px;
        inset-inline-end: 20px;
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--accent-on-solid);
        color: var(--white);
        border: none;
        box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
        cursor: pointer;
        z-index: 1000;
        transition: transform 0.2s, background 0.2s;
    }

    .toc-fab:hover,
    .toc-fab:focus-visible {
        background: var(--accent-hover);
        outline: 2px solid var(--accent-color);
        outline-offset: 2px;
    }

    .toc-fab:active { transform: scale(0.92); }
    .toc-fab svg    { width: 22px; height: 22px; }

    /* Tmavý overlay za bottom sheetem */
    .toc-overlay {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 1001;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
        opacity: 0;
        transition: opacity 0.25s;
    }

    .toc-overlay.is-visible  { display: block; }
    .toc-overlay.is-active   { opacity: 1; }

    /* Bottom sheet panel */
    .toc-overlay-panel {
        position: absolute;
        inset-block-end: 0;
        inset-inline: 0;
        max-height: 70dvh;
        background: var(--bg-container);
        border-radius: 16px 16px 0 0;
        overflow-y: auto;
        transform: translateY(100%);
        transition: transform 0.3s ease;
    }

    .toc-overlay.is-active .toc-overlay-panel {
        transform: translateY(0);
    }

    /* Záhlaví bottom sheetu — sticky, drážka uvnitř přes ::before (nezmlizí při skrolování) */
    .toc-overlay-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding-block: 24px 12px;
        padding-inline: 22px;
        border-block-end: 1px solid var(--border-color);
        position: sticky;
        top: 0;
        background: var(--bg-container);
        border-radius: 16px 16px 0 0;
        z-index: 1;
    }

    /* Drážka pro swipe-to-close — absolutně v sticky záhlaví, vždy viditelná */
    .toc-overlay-header::before {
        content: '';
        position: absolute;
        inset-block-start: 10px;
        inset-inline-start: 50%;
        transform: translateX(-50%);
        width: 36px;
        height: 4px;
        background: var(--border-color);
        border-radius: 2px;
    }

    .toc-overlay-title {
        font-weight: 700;
        font-size: var(--size-14);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        color: var(--text-main);
    }

    /* Zavírací tlačítko — 40px pro snadný zásah palcem (min. doporučeno 44px) */
    .toc-overlay-close {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        border: none;
        background: var(--bg-data-box);
        color: var(--text-muted);
        cursor: pointer;
        transition: background 0.15s;
    }

    .toc-overlay-close:hover  { background: var(--border-color); }
    .toc-overlay-close svg    { width: 18px; height: 18px; }

    /* Seznam položek v bottom sheetu */
    .toc-overlay-list {
        list-style: none;
        padding-block: 10px 24px;
        padding-inline: 16px;
        margin: 0;
    }

    .toc-overlay-list li { margin-bottom: 0; }

    .toc-overlay-list a {
        display: block;
        padding: 10px 14px;
        color: var(--text-label);
        text-decoration: none;
        border-radius: 8px;
        font-size: var(--size-14);
        transition: background 0.15s, color 0.15s;
        border-inline-start: 3px solid transparent;
    }

    .toc-overlay-list a:hover,
    .toc-overlay-list a.active {
        background: var(--accent-subtle);
        color: var(--accent-color);
        border-inline-start-color: var(--accent-color);
    }

    .toc-overlay-list .toc-ol-h2 > a {
        font-weight: 700;
        font-size: var(--size-14);
        color: var(--text-main);
        margin-block-start: 4px;
    }

    .toc-overlay-list .toc-ol-h2 > a.active { color: var(--accent-color); }

    /* Podpoložky h3 */
    .toc-overlay-sublist {
        list-style: none;
        padding-block: 0;
        padding-inline-start: 8px;
        margin: 0;
    }

    .toc-overlay-sublist a {
        font-size: var(--size-14);
        padding-block: 9px;
        padding-inline: 22px 14px;
        position: relative;
    }

    .toc-overlay-sublist a::before {
        content: '';
        position: absolute;
        inset-inline-start: 12px;
        top: 50%;
        width: 5px;
        height: 5px;
        border-radius: 50%;
        background: var(--text-muted);
        transform: translateY(-50%);
        transition: background 0.15s;
    }

    .toc-overlay-sublist a.active::before,
    .toc-overlay-sublist a:hover::before {
        background: var(--accent-color);
    }

    /* Neklikatelný skupinový label v overlay sublistu */
    .toc-overlay-sublist li.toc-group a {
        font-size: var(--size-11);
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.6px;
        color: var(--text-muted);
        margin-block-start: 6px;
        pointer-events: none;
        cursor: default;
    }
    .toc-overlay-sublist li.toc-group a::before { display: none; }
    .toc-overlay-sublist li.toc-group a:hover   { background: none; color: var(--text-muted); }
}

/* Zablokování scrollu na body při otevřeném overlay */
body.overlay-open { overflow: hidden; }