/* ============================================================
   CultureTogether – Header Component
   WCAG 2.1 Level AA/AAA konform
   ============================================================ */

/* ── CSS Custom Properties ──────────────────────────────── */
:root {
    --header-height: 4rem;
    --header-height-scrolled: 3.25rem;
    --header-bg: #ffffff;
    --header-bg-scrolled: rgba(255, 255, 255, 0.96);
    --header-shadow: 0 1px 0 rgba(0, 0, 0, 0.08);
    --header-shadow-scrolled: 0 2px 16px rgba(0, 0, 0, 0.10);
    --header-transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);

    --nav-link-color: #555555;
    --nav-link-color-hover: #1a73e8;
    --nav-link-color-active: #1a73e8;
    --nav-link-underline-color: #1a73e8;

    --focus-ring: 0 0 0 3px rgba(26, 115, 232, 0.45);
    --focus-ring-offset: 2px;
}

/* ── Skip-Link (WCAG 2.4.1 – AAA) ──────────────────────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 10000;
    padding: 0.75rem 1.25rem;
    background: var(--color-primary, #1a73e8);
    color: #ffffff;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 0 0 0.375rem 0.375rem;
    text-decoration: none;
    transition: top 0.15s ease;
    /* Mindestkontrast sichergestellt: weiß auf #1a73e8 ≈ 4.7:1 (AA) */
}

.skip-link:focus {
    top: 0;
    outline: none;
    box-shadow: var(--focus-ring);
}

/* ── Header-Wrapper ─────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
    height: var(--header-height);
    background: var(--header-bg);
    box-shadow: var(--header-shadow);
    transition:
        height var(--header-transition),
        background var(--header-transition),
        box-shadow var(--header-transition);
    /* GPU-Layer für glatte Animation */
    will-change: height, box-shadow;
}

.site-header.is-scrolled {
    height: var(--header-height-scrolled);
    background: var(--header-bg-scrolled);
    box-shadow: var(--header-shadow-scrolled);
}

/* backdrop-filter auf ::before, NICHT auf dem Element selbst:
   backdrop-filter auf einem Element macht es zum Containing Block für
   position:fixed Kinder – das würde das mobile Nav-Panel falsch positionieren. */
.site-header.is-scrolled::before {
    content: '';
    position: absolute;
    inset: 0;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    pointer-events: none;
    z-index: -1;
}

/* ── Innerer Container ──────────────────────────────────── */
.site-header__inner {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    height: 100%;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ── Logo ───────────────────────────────────────────────── */
.site-header__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-primary, #1a73e8);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.125rem;
    letter-spacing: -0.01em;
    white-space: nowrap;
    flex-shrink: 0;
    border-radius: 0.25rem;
    transition: opacity var(--header-transition);
}

.site-header__logo:hover {
    opacity: 0.8;
}

.site-header__logo:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    outline-offset: var(--focus-ring-offset);
}

.site-header__logo-icon {
    flex-shrink: 0;
    transition: transform var(--header-transition);
}

.site-header__logo:hover .site-header__logo-icon {
    transform: rotate(-8deg) scale(1.08);
}

.site-header.is-scrolled .site-header__logo-text {
    /* Mikro-Animation: Text leicht kleiner beim Scrollen */
    font-size: 1rem;
    transition: font-size var(--header-transition);
}

/* ── Desktop-Navigation ─────────────────────────────────── */
.site-header__nav {
    flex: 1;
}

.site-header__nav-list {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Nav-Link: Underline-Slide-Animation */
.site-header__nav-link {
    position: relative;
    display: inline-block;
    padding: 0.375rem 0.625rem;
    color: var(--nav-link-color);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 0.375rem;
    transition: color 0.2s ease;
    /* Mindestkontrast #555 auf #fff ≈ 7.1:1 (AAA) */
}

.site-header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0.625rem;
    right: 0.625rem;
    height: 2px;
    background: var(--nav-link-underline-color);
    border-radius: 1px;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-header__nav-link:hover {
    color: var(--nav-link-color-hover);
}

.site-header__nav-link:hover::after {
    transform: scaleX(1);
}

.site-header__nav-link.is-active {
    color: var(--nav-link-color-active);
    font-weight: 600;
}

.site-header__nav-link.is-active::after {
    transform: scaleX(1);
}

/* Focus-Style (WCAG 2.4.11 – AA, 2.4.12 – AAA) */
.site-header__nav-link:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    color: var(--nav-link-color-hover);
}

/* ── Auth-Buttons ───────────────────────────────────────── */
.site-header__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.site-header__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 0.5rem;
    text-decoration: none;
    cursor: pointer;
    transition:
        background 0.2s ease,
        color 0.2s ease,
        box-shadow 0.2s ease,
        transform 0.15s ease;
}

.site-header__btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.site-header__btn:active {
    transform: scale(0.97);
}

/* Login-Button: Primär */
.site-header__btn--login {
    background: var(--color-primary, #1a73e8);
    color: #ffffff;
    /* Kontrast: 4.7:1 (AA), erfüllt WCAG 1.4.3 */
}

.site-header__btn--login:hover {
    background: #1557b0;
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.35);
}

/* Registrieren-Button: Ghost */
.site-header__btn--register {
    background: transparent;
    color: var(--color-primary, #1a73e8);
    border: 2px solid var(--color-primary, #1a73e8);
    /* Kontrast: #1a73e8 auf #fff ≈ 4.7:1 (AA) */
}

.site-header__btn--register:hover {
    background: rgba(26, 115, 232, 0.08);
}

.site-header__btn--register:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* Profil-Button: Ghost */
.site-header__btn--profile {
    background: transparent;
    color: #374151;
    border: 1.5px solid #e5e7eb;
    border-radius: 999px;
    padding: 0.3rem 0.75rem 0.3rem 0.3rem;
    gap: 0.5rem;
}

.site-header__btn--profile:hover {
    background: #f9fafb;
    border-color: #d1d5db;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Avatar-Bild im Button */
.site-header__avatar-img {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    display: block;
    border: 1.5px solid #e5e7eb;
}

/* Initialen-Kreis im Button (Fallback) */
.site-header__avatar-initials {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-primary, #1a73e8);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    /* WCAG 1.4.3: Weiß auf #1a73e8 ≈ 4.7:1 */
    user-select: none;
}

/* Chevron-Icon im Profil-Button */
.site-header__chevron {
    transition: transform 0.2s ease;
}

[aria-expanded="true"] .site-header__chevron {
    transform: rotate(180deg);
}

/* ── User-Dropdown ──────────────────────────────────────── */
.site-header__user-menu {
    position: relative;
}

.site-header__dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 220px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    z-index: 200;
    overflow: hidden;
    animation: dropdown-in 0.18s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes dropdown-in {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

.site-header__dropdown[hidden] {
    display: none;
}

.site-header__dropdown-info {
    padding: 0.875rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.site-header__dropdown-user {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

/* Avatar im Dropdown */
.site-header__dropdown-avatar {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

.site-header__dropdown-avatar--img {
    object-fit: cover;
    border: 1.5px solid #e5e7eb;
    display: block;
}

.site-header__dropdown-avatar--initials {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary, #1a73e8);
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 700;
    /* WCAG 1.4.3: Weiß auf #1a73e8 ≈ 4.7:1 */
    user-select: none;
}

.site-header__dropdown-name {
    font-weight: 600;
    font-size: 0.9375rem;
    color: #111827;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
}

.site-header__dropdown-email {
    font-size: 0.8125rem;
    color: #6b7280;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
}

.site-header__dropdown-verify-hint {
    font-size: 0.75rem;
    color: #d97706;
    text-decoration: underline;
    margin-top: 4px;
}

.site-header__dropdown-verify-hint:hover {
    text-decoration: none;
}

.site-header__dropdown-divider {
    border: none;
    border-top: 1px solid #f3f4f6;
    margin: 0;
}

.site-header__dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    font-family: inherit;
    font-weight: 500;
    color: #374151;
    background: none;
    border: none;
    cursor: pointer;
    text-decoration: none;
    text-align: left;
    transition: background 0.15s ease, color 0.15s ease;
    min-height: 44px;
}

.site-header__dropdown-item:hover {
    background: #f9fafb;
}

.site-header__dropdown-item:focus-visible {
    outline: none;
    background: #eff6ff;
    color: var(--color-primary, #1a73e8);
}

.site-header__dropdown-item--logout {
    color: #dc2626;
}

.site-header__dropdown-item--logout:hover {
    background: #fef2f2;
}

/* Mobile Auth-Links: auf Desktop versteckt */
.site-header__nav-auth-mobile {
    display: none;
}

.site-header__nav-link--register {
    color: var(--color-primary, #1a73e8);
    font-weight: 600;
}

.site-header__nav-link--logout {
    background: none;
    border: none;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    width: 100%;
    text-align: left;
    cursor: pointer;
    color: #dc2626;
    padding: 0.875rem 0.5rem;
    border-bottom: 1px solid var(--color-border, #dddddd);
}

.site-header__nav-link--logout:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* ── Hamburger-Button ───────────────────────────────────── */
.site-header__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0.5rem;
    background: transparent;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    flex-shrink: 0;
    /* Touch-Target ≥ 44×44px (WCAG 2.5.8 – AA) */
    min-width: 44px;
    min-height: 44px;
}

.site-header__hamburger:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.site-header__hamburger-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text, #333333);
    border-radius: 2px;
    transition:
        transform 0.3s cubic-bezier(0.4, 0, 0.2, 1),
        opacity 0.2s ease;
    transform-origin: center;
}

/* Hamburger → X-Transformation */
.site-header__hamburger.is-active .site-header__hamburger-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-header__hamburger.is-active .site-header__hamburger-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.site-header__hamburger.is-active .site-header__hamburger-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── Reduced Motion (WCAG 2.3.3 – AAA) ─────────────────── */
@media (prefers-reduced-motion: reduce) {
    .site-header,
    .site-header__logo,
    .site-header__logo-icon,
    .site-header__nav-link,
    .site-header__nav-link::after,
    .site-header__btn,
    .site-header__hamburger-bar,
    .site-header__nav {
        transition: none !important;
        animation: none !important;
    }
}

/* ── Responsive: Mobile ─────────────────────────────────── */
@media (max-width: 767px) {

    .site-header__hamburger {
        display: flex;
        margin-left: auto;
    }

    /* Desktop-Nav ausblenden, Mobile-Nav überlagern */
    .site-header__nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        /* Muss über Karte, Suchleiste (z-index 10) und Backdrops (190) liegen */
        z-index: 1100;
        background: var(--header-bg);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        padding: 1rem 1.5rem 1.5rem;
        border-top: 1px solid var(--color-border, #dddddd);

        /* Einblend-Animation */
        opacity: 0;
        transform: translateY(-0.5rem);
        pointer-events: none;
        visibility: hidden;
        transition:
            opacity 0.25s ease,
            transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
            visibility 0s linear 0.25s;
    }

    .site-header__nav.is-open {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
        visibility: visible;
        transition:
            opacity 0.25s ease,
            transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
            visibility 0s linear 0s;
    }

    .site-header__nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .site-header__nav-link {
        display: block;
        padding: 0.875rem 0.5rem;
        font-size: 1rem;
        border-bottom: 1px solid var(--color-border, #dddddd);
        border-radius: 0;
    }

    .site-header__nav-link::after {
        display: none; /* Kein Underline auf Mobile */
    }

    .site-header__nav-list li:last-child .site-header__nav-link {
        border-bottom: none;
    }

    .site-header__actions {
        display: none; /* Auth-Buttons im Desktop-Bereich auf Mobile versteckt */
    }

    /* Mobile Auth-Links im Nav einblenden */
    .site-header__nav-auth-mobile {
        display: block;
    }

    /* Body-Scroll sperren wenn Menü offen */
    body.nav-open {
        overflow: hidden;
    }
}

/* ── Responsive: Tablet ─────────────────────────────────── */
@media (min-width: 768px) and (max-width: 1023px) {

    .site-header__inner {
        gap: 1rem;
    }

    .site-header__nav-link {
        font-size: 0.875rem;
        padding: 0.375rem 0.5rem;
    }

    .site-header__btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.875rem;
    }
}

/* ── High Contrast Mode (WCAG 1.4.11) ──────────────────── */
@media (forced-colors: active) {
    .site-header {
        border-bottom: 1px solid ButtonText;
    }

    .site-header__nav-link::after {
        background: Highlight;
    }

    .site-header__btn--login {
        background: ButtonFace;
        color: ButtonText;
        border: 2px solid ButtonText;
    }

    .site-header__hamburger-bar {
        background: ButtonText;
    }

    .site-header__btn--profile {
        border: 2px solid ButtonText;
        color: ButtonText;
    }

    .site-header__avatar-initials,
    .site-header__dropdown-avatar--initials {
        background: ButtonFace;
        color: ButtonText;
        border: 1px solid ButtonText;
    }

    .site-header__avatar-img,
    .site-header__dropdown-avatar--img {
        border: 1px solid ButtonText;
    }
}