.topbar {
    display: none;
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--text-xs);
}

@media (min-width: 768px) {
    .topbar {
        display: block;
    }
}

.topbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 8px;
    gap: var(--space-3);
}

.topbar__item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.topbar__item a {
    color: rgba(255, 255, 255, 0.9);
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 500;
    width: 100%;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 2px 20px rgba(30, 30, 30, 0.05);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
    min-height: var(--header-height);
}

.site-header__logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-header__logo-img {
    display: block;
    height: 38px;
    width: auto;
}

.main-nav {
    display: none;
}

.main-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    list-style: none;
}

.main-nav__link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
    font-size: var(--text-sm);
    font-family: var(--font-sans);
    letter-spacing: 0.01em;
    color: var(--color-secondary);
    padding: 10px 0;
    background: none;
    border: none;
    white-space: nowrap;
    cursor: pointer;
}

.main-nav__link .icon-14 {
    opacity: 0.7;
}

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

.main-nav__item {
    position: relative;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.header-actions__cta {
    display: none;
    align-items: center;
    gap: var(--space-2);
}

@media (min-width: 1180px) {
    .header-actions__cta {
        display: flex;
    }
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(14, 91, 76, 0.08);
    color: var(--color-primary-dark);
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.icon-btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.nav-toggle {
    display: inline-flex;
}

@media (min-width: 1180px) {
    .nav-toggle {
        display: none;
    }
}

/* Mega Menü */
.mega-menu {
    position: absolute;
    top: calc(100% + 14px);
    left: 50%;
    transform: translateX(-50%);
    width: min(880px, 90vw);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-elevated);
    padding: var(--space-4);
    display: none;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    z-index: 600;
}

.main-nav__item.is-open .mega-menu {
    display: grid;
}

.mega-menu__col-title {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: var(--text-sm);
    color: var(--color-primary-dark);
    margin-bottom: var(--space-2);
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-accent);
}

.mega-menu__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mega-menu__list a {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    display: block;
}

.mega-menu__list a:hover {
    color: var(--color-secondary);
}

/* Basit dropdown (Kurumsal / Bilgi Merkezi) */
.simple-dropdown {
    position: absolute;
    top: calc(100% + 14px);
    left: 0;
    min-width: 220px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-elevated);
    padding: var(--space-2);
    display: none;
    flex-direction: column;
    z-index: 600;
}

.main-nav__item.is-open .simple-dropdown {
    display: flex;
}

.simple-dropdown a {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    color: var(--color-text);
}

.simple-dropdown a:hover {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

@media (min-width: 1180px) {
    .main-nav {
        display: block;
    }
}

/* Mobil menü paneli */
.mobile-nav {
    position: fixed;
    inset: 0;
    background: var(--color-surface);
    z-index: 900;
    padding: var(--space-4);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
}

.mobile-nav.is-open {
    transform: translateX(0);
}

.mobile-nav__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.mobile-nav__list {
    list-style: none;
    display: flex;
    flex-direction: column;
}

.mobile-nav__list > li {
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav__link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) 0;
    font-weight: 600;
    color: var(--color-primary-dark);
}

.mobile-nav__sub {
    list-style: none;
    display: none;
    padding-left: var(--space-3);
    padding-bottom: var(--space-2);
}

.mobile-nav__item.is-open .mobile-nav__sub {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-nav__sub a {
    display: block;
    padding: 8px 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}

.mobile-nav-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(30, 30, 30, 0.5);
    z-index: 899;
    display: none;
}

.mobile-nav-backdrop.is-open {
    display: block;
}

@media (min-width: 1180px) {
    .mobile-nav,
    .mobile-nav-backdrop {
        display: none !important;
    }
}