/**
 * Header & Navigation — assets/css/header.css
 * Sticky site header with logo, primary navigation, and language dropdown.
 *
 * @package  DEI4SME
 * @used-in  header.php
 *
 * SELECTORS:
 *   .site-header               — Sticky header bar with bottom border
 *   .site-header__inner        — Flex row: branding left, nav + lang right
 *   .site-header__lang-slot    — Inline slot for language switcher (desktop)
 *   .site-header__backdrop     — Fixed overlay behind mobile drawer
 *   .site-branding             — Logo wrapper (flex-shrink: 0)
 *   .site-branding img         — Logo image (64px height, retina via srcset)
 *   .main-navigation           — <nav> wrapper with menu + mobile lang block
 *   .main-navigation a         — Menu link (15px, weight 600, #535862)
 *   .lang-switcher             — Desktop language pill-button + dropdown
 *   .lang-switcher-mobile      — Mobile language pills (inside drawer)
 */

/* === Header === */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding-top: env(safe-area-inset-top, 0px);
}

.site-header__inner {
    padding: 18px 0;
    display: flex;
    align-items: center;
}

/* === Branding === */
.site-branding {
    flex-shrink: 0;
}

.site-branding a {
    display: flex;
    align-items: center;
}

.site-header .site-branding img {
    height: 64px;
    width: auto;
    object-fit: contain;
}

/* === Navigation (Desktop) === */
.main-navigation {
    display: flex;
    align-items: center;
    margin-left: auto;
}

.main-navigation ul {
    list-style: none;
    display: flex;
    align-items: center;
    margin: 0;
    padding: 0;
}

.main-navigation li {
    position: relative;
}

.main-navigation a {
    display: block;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    color: var(--color-text-nav);
    padding: 12px;
    line-height: 1.4;
    transition: color 0.15s ease-in-out;
    white-space: nowrap;
}

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

.main-navigation .current-menu-item > a,
.main-navigation .is-active > a {
    color: var(--color-primary);
    position: relative;
}

.main-navigation .current-menu-item > a::after,
.main-navigation .is-active > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 12px;
    right: 12px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 3px 3px 0 0;
}

/* Mobile-only language switcher: hidden on desktop */
.main-navigation__lang-mobile {
    display: none;
}

/* === Language Switcher Slot (Desktop) === */
.site-header__lang-slot {
    flex-shrink: 0;
    margin-left: 12px;
}

/* === PWA Install Button (mobile header bar) === */
.pwa-install-btn--header {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--color-primary);
    border-radius: 8px;
    background: var(--color-primary);
    color: #fff;
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    min-height: 44px;
}

.pwa-install-btn__icon {
    flex-shrink: 0;
}

/* === Language Switcher Component === */
.lang-switcher {
    position: relative;
    display: flex;
    align-items: center;
}

/* Trigger button: pill shape */
.lang-switcher__trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid #E2E8F0;
    border-radius: 8px;
    background: var(--color-bg);
    color: var(--color-text-nav);
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    min-height: 44px;
    min-width: 44px;
}

.lang-switcher__trigger:hover {
    border-color: var(--color-primary);
}

.lang-switcher__trigger[aria-expanded="true"] {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary);
}

/* Globe icon */
.lang-switcher__icon {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

/* Language code text */
.lang-switcher__code {
    line-height: 1;
}

/* Chevron icon */
.lang-switcher__chevron {
    flex-shrink: 0;
    width: 12px;
    height: 12px;
    transition: transform 0.2s ease;
}

.lang-switcher__trigger[aria-expanded="true"] .lang-switcher__chevron {
    transform: rotate(180deg);
}

/* Dropdown panel */
.lang-switcher__dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 180px;
    list-style: none;
    margin: 0;
    padding: 4px 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 200;
}

.lang-switcher--open .lang-switcher__dropdown {
    display: block;
}

/* Dropdown option */
.lang-switcher__option {
    margin: 0;
    padding: 0;
}

.lang-switcher__option a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    text-decoration: none;
    color: var(--color-text-nav);
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.1s ease-in-out;
    min-height: 44px;
}

.lang-switcher__option a:hover {
    background-color: var(--color-bg-alt);
    color: var(--color-primary);
}

.lang-switcher__option--active a {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-switcher__option-code {
    font-weight: 600;
    min-width: 24px;
}

.lang-switcher__option-name {
    flex: 1;
}

.lang-switcher__check {
    flex-shrink: 0;
    color: var(--color-primary);
    margin-left: auto;
}

/* === Hamburger Button === */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    min-width: 44px;
    min-height: 44px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 201;
}

.menu-toggle__bar {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* X animation when open */
.menu-open .menu-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-open .menu-toggle__bar:nth-child(2) {
    opacity: 0;
}

.menu-open .menu-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* === Mobile Backdrop === */
.site-header__backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.menu-open .site-header__backdrop {
    display: block;
    opacity: 1;
}

/* === Mobile Language Switcher (inside drawer) === */
.lang-switcher-mobile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.lang-switcher-mobile__label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.lang-switcher-mobile__links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.lang-switcher-mobile__link {
    display: flex;
    flex: 1 1 0;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 44px;
    padding: 8px 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-nav);
    text-decoration: none;
    transition: border-color 0.15s, color 0.15s, background-color 0.15s;
}

.lang-switcher-mobile__link:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

.lang-switcher-mobile__link.lang-switcher-mobile__link--active,
.lang-switcher-mobile__link.lang-switcher-mobile__link--active:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

/* ============================================================
   Desktop: force-show nav, hide toggle (min-width: 1025px)
   ============================================================ */
@media (min-width: 1025px) {
    .menu-toggle {
        display: none !important;
    }

    .main-navigation {
        display: flex !important;
        position: static;
        transform: none;
        width: auto;
        max-width: none;
        background: transparent;
        padding: 0;
        box-shadow: none;
        overflow: visible;
    }

    .site-header__backdrop {
        display: none !important;
    }
}

/* ============================================================
   Mobile: Slide-in Drawer (max-width: 1024px)
   ============================================================ */
@media (max-width: 1024px) {
    .menu-toggle {
        display: flex;
    }

    /* Hide desktop language switcher on mobile */
    .site-header__lang-slot {
        display: none;
    }

    /* Show PWA install button in mobile header bar */
    .pwa-install-btn--header {
        display: flex;
        margin-left: auto;
        margin-right: 8px;
    }

    .site-header__inner {
        flex-wrap: nowrap;
    }

    /* Slide-in drawer from right */
    .main-navigation {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: 320px;
        max-width: 85vw;
        background: var(--color-bg);
        z-index: 200;
        display: flex;
        flex-direction: column;
        padding: var(--spacing-lg) var(--spacing-md);
        padding-top: 100px;
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        box-shadow: none;
    }

    .menu-open .main-navigation {
        transform: translateX(0);
        box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
    }

    .main-navigation ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .main-navigation li {
        border-bottom: 1px solid var(--color-border);
    }

    .main-navigation li:last-child {
        border-bottom: none;
    }

    .main-navigation a {
        padding: 16px 10px;
        font-size: 16px;
        font-weight: 600;
        color: var(--color-text-nav);
        line-height: 1.4;
    }

    .main-navigation a:hover,
    .main-navigation .current-menu-item > a,
    .main-navigation .is-active > a {
        color: var(--color-primary);
    }

    .main-navigation .current-menu-item > a,
    .main-navigation .is-active > a {
        background: rgba(79, 129, 201, 0.08);
        border-left: 3px solid var(--color-primary);
        padding-left: 7px;
    }

    /* No bottom underline in mobile — use left border instead */
    .main-navigation .current-menu-item > a::after,
    .main-navigation .is-active > a::after {
        display: none;
    }

    /* Show mobile language switcher inside drawer */
    .main-navigation__lang-mobile {
        display: block;
        padding-top: var(--spacing-md);
        border-top: 1px solid var(--color-border);
    }

    /* Lock body scroll when drawer is open */
    body.menu-open {
        overflow: hidden;
    }
}

/* ============================================================
   Small Mobile: Full-width drawer (max-width: 480px)
   ============================================================ */
@media (max-width: 480px) {
    .main-navigation {
        width: 100vw;
        max-width: 100vw;
    }
}

/* ============================================================
   PWA Install Guide (iOS bottom sheet)
   ============================================================ */
.pwa-install-guide {
    position: fixed;
    inset: 0;
    z-index: 10000;
}

.pwa-install-guide__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0);
    transition: background 0.3s ease;
}

.pwa-install-guide--visible .pwa-install-guide__backdrop {
    background: rgba(0, 0, 0, 0.5);
}

.pwa-install-guide__sheet {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fff;
    border-radius: 16px 16px 0 0;
    padding: 24px 20px 32px;
    max-width: 480px;
    margin: 0 auto;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.pwa-install-guide--visible .pwa-install-guide__sheet {
    transform: translateY(0);
}

.pwa-install-guide__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.pwa-install-guide__title {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text, #1a1a2e);
}

.pwa-install-guide__close {
    background: none;
    border: none;
    font-size: 24px;
    line-height: 1;
    color: #666;
    cursor: pointer;
    padding: 10px;
    min-height: 44px;
}

.pwa-install-guide__steps {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.pwa-install-guide__step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 15px;
    line-height: 1.5;
    color: #333;
}

.pwa-install-guide__icon {
    display: inline-flex;
    vertical-align: middle;
    background: #f0f0f0;
    border-radius: 6px;
    padding: 4px;
    margin-left: 4px;
}

.pwa-install-guide__step strong {
    color: var(--color-primary, #4F81C9);
}

.pwa-install-guide__num {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-primary, #4F81C9);
    color: #fff;
    font-size: 14px;
    font-weight: 700;
}

/* ============================================================
   PWA Install Toast (unsupported browsers)
   ============================================================ */
.pwa-install-toast {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10000;
    padding: 16px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.pwa-install-toast--visible {
    transform: translateY(0);
}

.pwa-install-toast__content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    max-width: 480px;
    margin: 0 auto;
    padding: 16px 20px;
    background: #1a1a2e;
    color: #fff;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.5;
    box-shadow: 0 -2px 16px rgba(0, 0, 0, 0.2);
}

.pwa-install-toast__content p {
    margin: 0;
    flex: 1;
}

.pwa-install-toast__content strong {
    color: #6cb4ee;
}

.pwa-install-toast__close {
    flex-shrink: 0;
    background: none;
    border: none;
    color: #fff;
    font-size: 22px;
    line-height: 1;
    cursor: pointer;
    padding: 10px;
    min-height: 44px;
    opacity: 0.7;
}

.pwa-install-toast__close:hover {
    opacity: 1;
}

/* ============================================================
   Reduced Motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    .menu-toggle__bar {
        transition: none;
    }

    .main-navigation {
        transition: none;
    }

    .site-header__backdrop {
        transition: none;
    }

    .lang-switcher__chevron {
        transition: none;
    }

    .lang-switcher__trigger {
        transition: none;
    }

    .lang-switcher__option a {
        transition: none;
    }

    .lang-switcher-mobile__link {
        transition: none;
    }

    .pwa-install-guide__backdrop,
    .pwa-install-guide__sheet,
    .pwa-install-toast {
        transition: none;
    }
}