/* ==========================================================================
   Horní lišta a hlavička s navigací
   ========================================================================== */

/* --- Horní kontaktní lišta ----------------------------------------------- */
.topbar {
    font-size: var(--fs-label);
    font-weight: 500;
    color: var(--color-on-dark-muted);
    background-color: var(--color-dark-deep);
    border-bottom: 1px solid var(--color-line-dark);
}

.topbar__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    min-height: 2.25rem;
}

.topbar__group {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.topbar__item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    transition: color var(--transition-fast);
}

.topbar__item .icon {
    font-size: 1rem;
    color: var(--color-accent);
}

a.topbar__item:hover {
    color: var(--color-accent-light);
}

/* Na mobilu jen telefon a e-mail */
.topbar__group--info,
.topbar__item--email {
    display: none;
}

.topbar__group--contact {
    width: 100%;
    justify-content: center;
}

@media (min-width: 640px) {
    .topbar__item--email {
        display: inline-flex;
    }
}

@media (min-width: 768px) {
    .topbar__group--info {
        display: flex;
    }

    .topbar__group--contact {
        width: auto;
    }
}

/* --- Hlavička (frosted glass, lepkavá) ----------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgb(255 255 255 / 90%);
    border-bottom: 1px solid rgb(226 232 240 / 80%);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    transition: box-shadow var(--transition);
}

.site-header.is-scrolled {
    box-shadow: 0 8px 28px rgb(15 23 42 / 8%);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    min-height: var(--header-height);
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.site-header__cta {
    display: none;
}

@media (min-width: 640px) {
    .site-header__cta {
        display: inline-flex;
    }
}

/* --- Logo ---------------------------------------------------------------- */
.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.brand__logo {
    width: 2.25rem;
    height: 2.25rem;
}

/* Celé logo se znakem a nápisem (poměr stran 1044 : 241) */
.brand__logo--full {
    width: auto;
    height: 2.25rem;
}

@media (min-width: 1200px) {
    .brand__logo--full {
        height: 2.5rem;
    }
}

.brand__name {
    font-family: var(--font-heading);
    font-size: 1.0625rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.01em;
    color: var(--color-ink);
}

/* --- Tlačítko mobilního menu --------------------------------------------- */
.nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    color: var(--color-ink);
    background: transparent;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-sm);
}

.nav-toggle .icon {
    font-size: 1.5rem;
}

.nav-toggle__icon--close,
.nav-toggle[aria-expanded="true"] .nav-toggle__icon--open {
    display: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon--close {
    display: inline-block;
}

/* --- Hlavní navigace – mobil (rozbalovací panel) ------------------------- */
.main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    padding: var(--space-md) var(--page-margin) var(--space-lg);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-float);
}

.main-nav.is-open {
    display: block;
}

.main-nav__list {
    display: flex;
    flex-direction: column;
}

.main-nav__link {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.75rem 0;
    font-size: var(--fs-label-lg);
    font-weight: 600;
    color: var(--color-text);
    transition: color var(--transition-fast);
}

.main-nav__link:hover {
    color: var(--color-ink);
}

/* Odkaz na sekci, která je právě v zobrazení (nastavuje main.js) */
.main-nav__link[aria-current="true"] {
    color: var(--color-accent-text);
}

.main-nav__chevron {
    display: none;
}

.main-nav__submenu {
    display: flex;
    flex-direction: column;
    padding-left: var(--space-md);
    margin-bottom: var(--space-sm);
    border-left: 2px solid var(--color-accent-border);
}

.main-nav__sublink {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--fs-body-sm);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.main-nav__sublink:hover {
    color: var(--color-ink);
    background-color: var(--color-surface-alt);
}

.main-nav__cta {
    margin-top: var(--space-md);
}

@media (min-width: 640px) {
    .main-nav__cta {
        display: none;
    }
}

/* --- Hlavní navigace – desktop ------------------------------------------- */
@media (min-width: 1100px) {
    .nav-toggle {
        display: none;
    }

    .main-nav {
        position: static;
        display: block;
        max-height: none;
        overflow: visible;
        padding: 0;
        background: transparent;
        border: 0;
        box-shadow: none;
    }

    .main-nav__list {
        flex-direction: row;
        align-items: center;
        gap: var(--space-lg);
    }

    .main-nav__link::after {
        content: "";
        position: absolute;
        right: 0;
        bottom: 0.25rem;
        left: 0;
        height: 2px;
        background-color: var(--color-accent);
        transform: scaleX(0);
        transform-origin: left;
        transition: transform var(--transition);
    }

    .main-nav__link:hover::after,
    .main-nav__link[aria-current="true"]::after {
        transform: scaleX(1);
    }

    .main-nav__item--has-submenu {
        position: relative;
    }

    .main-nav__chevron {
        display: inline-block;
        font-size: 1.125rem;
        transition: transform var(--transition-fast);
    }

    /* Podmenu se otevře myší i klávesnicí (focus-within) */
    .main-nav__submenu {
        position: absolute;
        top: 100%;
        left: calc(var(--space-md) * -1);
        width: 16rem;
        padding: var(--space-sm);
        margin: 0;
        background-color: var(--color-surface);
        border: 1px solid var(--color-line);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-card-hover);
        opacity: 0;
        visibility: hidden;
        transform: translateY(4px);
        transition: opacity var(--transition-fast), transform var(--transition-fast),
            visibility var(--transition-fast);
    }

    .main-nav__item--has-submenu:hover .main-nav__submenu,
    .main-nav__item--has-submenu:focus-within .main-nav__submenu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .main-nav__item--has-submenu:hover .main-nav__chevron,
    .main-nav__item--has-submenu:focus-within .main-nav__chevron {
        transform: rotate(180deg);
    }

    .main-nav__cta {
        display: none;
    }
}