/**
 * KurumsalScript - Site Header & Navigasyon
 */

/* ---- Ana Header ---- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    height: var(--header-yukseklik);
    transition:
        background-color var(--gecis-normal),
        box-shadow       var(--gecis-normal),
        height           var(--gecis-normal),
        backdrop-filter  var(--gecis-normal);
}

/* Şeffaf başlangıç (hero üstünde) */
.site-header.seffaf {
    background: transparent;
}

.site-header.seffaf .logo-gorsel-renkli { display: none; }
.site-header.seffaf .logo-gorsel-beyaz  { display: block; }
.site-header:not(.seffaf) .logo-gorsel-beyaz { display: none; }

/* Scroll sonrası katı */
.site-header.katı {
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 1px 0 var(--kenar-rengi), var(--golge-sm);
    height: var(--header-yukseklik-sm);
}

/* Header iç yapı */
.site-header-icerik {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-8);
}

/* ---- Logo ---- */
.site-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    text-decoration: none;
}

.site-logo img {
    height: 44px;
    width: auto;
    transition: height var(--gecis-normal);
}

.katı .site-logo img { height: 36px; }

.logo-metin {
    font-size: 1.5rem;
    font-weight: var(--font-weight-extra);
    letter-spacing: -0.03em;
    color: var(--renk-birincil);
}

.site-header.seffaf .logo-metin { color: #fff; }

/* ---- Navigasyon ---- */
.site-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.site-nav > ul {
    display: flex;
    align-items: center;
    gap: 0.125rem;
}

/* Nav öğesi */
.nav-oge {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.5rem 0.875rem;
    font-size: var(--font-sm);
    font-weight: var(--font-weight-medium);
    color: var(--metin-birincil);
    border-radius: var(--kenar-radius);
    text-decoration: none;
    transition: color var(--gecis-hizli), background var(--gecis-hizli);
    white-space: nowrap;
}

.site-header.seffaf .nav-link { color: rgba(255,255,255,.9); }
.site-header.seffaf .nav-link:hover { color: #fff; background: rgba(255,255,255,.12); }

.nav-link:hover,
.nav-link.aktif {
    color: var(--renk-birincil);
    background: var(--arkaplan-ikincil);
}

.nav-link.aktif {
    font-weight: var(--font-weight-semibold);
}

/* Alt menü ok */
.nav-ok {
    font-size: 0.9em;
    transition: transform var(--gecis-hizli);
}
.nav-oge:hover .nav-ok { transform: rotate(180deg); }

/* ---- Dropdown ---- */
.nav-dropdown {
    position: absolute;
    top: calc(100% + 0.75rem);
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    min-width: 220px;
    background: #fff;
    border: 1px solid var(--kenar-rengi);
    border-radius: var(--kenar-radius);
    box-shadow: var(--golge-md);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity var(--gecis-normal),
        transform var(--gecis-normal),
        visibility var(--gecis-normal);
    z-index: var(--z-dropdown);
}

.nav-dropdown::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 12px;
    height: 12px;
    background: #fff;
    border: 1px solid var(--kenar-rengi);
    border-right: none;
    border-bottom: none;
    clip-path: polygon(0 0, 100% 0, 0 100%);
    transform: translateX(-50%) rotate(45deg);
}

.nav-oge:hover .nav-dropdown,
.nav-oge:focus-within .nav-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.nav-dropdown a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 0.875rem;
    font-size: var(--font-sm);
    color: var(--metin-ikincil);
    border-radius: calc(var(--kenar-radius) - 2px);
    text-decoration: none;
    transition: color var(--gecis-hizli), background var(--gecis-hizli);
}

.nav-dropdown a i { color: var(--renk-birincil); font-size: 1.1em; }

.nav-dropdown a:hover {
    color: var(--renk-birincil);
    background: var(--arkaplan-ikincil);
}

/* ---- Header Sağ (CTA + Dil) ---- */
.header-sag {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.dil-secici {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: var(--font-xs);
    font-weight: var(--font-weight-medium);
    color: var(--metin-ikincil);
    cursor: pointer;
    padding: 0.4rem 0.6rem;
    border-radius: var(--kenar-radius);
    transition: background var(--gecis-hizli);
}
.dil-secici:hover { background: var(--arkaplan-ikincil); }
.site-header.seffaf .dil-secici { color: rgba(255,255,255,.8); }

/* ---- Hamburger (mobile) ---- */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border-radius: var(--kenar-radius);
    cursor: pointer;
    background: none;
    border: none;
    transition: background var(--gecis-hizli);
}

.hamburger:hover { background: var(--arkaplan-ikincil); }

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--metin-birincil);
    border-radius: 9999px;
    transition: transform var(--gecis-normal), opacity var(--gecis-normal);
    transform-origin: center;
}

.site-header.seffaf .hamburger span { background: #fff; }

.hamburger.acik span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.acik span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.acik span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile Menü ---- */
.mobil-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(380px, 100vw);
    height: 100vh;
    background: #fff;
    z-index: calc(var(--z-sticky) + 5);
    box-shadow: var(--golge-xl);
    overflow-y: auto;
    transition: right var(--gecis-yavas);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
}

.mobil-menu.acik { right: 0; }

.mobil-menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: calc(var(--z-sticky) + 4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--gecis-normal), visibility var(--gecis-normal);
    backdrop-filter: blur(4px);
}
.mobil-menu-overlay.aktif { opacity: 1; visibility: visible; }

.mobil-menu-kapat {
    align-self: flex-end;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--kenar-radius);
    background: var(--arkaplan-ikincil);
    cursor: pointer;
    margin-bottom: 2rem;
    font-size: 1.25rem;
    color: var(--metin-birincil);
    border: none;
}

.mobil-menu nav ul {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.mobil-menu nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    font-size: var(--font-base);
    font-weight: var(--font-weight-medium);
    color: var(--metin-birincil);
    border-radius: var(--kenar-radius);
    text-decoration: none;
    transition: background var(--gecis-hizli), color var(--gecis-hizli);
}

.mobil-menu nav a:hover,
.mobil-menu nav a.aktif {
    background: rgba(var(--renk-birincil-rgb), .08);
    color: var(--renk-birincil);
}

.mobil-menu-footer {
    margin-top: auto;
    padding-top: 2rem;
    border-top: 1px solid var(--kenar-rengi);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* ---- Body offset (header yüksekliği kadar) ---- */
.header-offset { padding-top: var(--header-yukseklik); }
.header-offset-sm { padding-top: var(--header-yukseklik-sm); }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .site-nav { display: none; }
    .hamburger { display: flex; }
}