/* =====================================================
 * HEADER.CSS – 20. Uluslararası Kil Sempozyumu
 * ===================================================== */

/* ===== ANA HEADER YAPISI ===== */
.sym-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
    padding: 0;
}

/* Anasayfada yarı saydam başlangıç */
.sym-header.transparent {
    background: transparent;
}

/* Scroll sonrası veya iç sayfalarda dolgu */
.sym-header.sticky,
.sym-header.solid {
    background: var(--secondary);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.12);
}

/* İç sayfalarda varsayılan olarak dolu */
.inner-page .sym-header {
    background: var(--secondary);
}

/* ===== HEADER İÇ ALANI ===== */
.sym-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    height: 74px;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    transition: height var(--transition);
}

.sym-header.sticky .sym-header-inner {
    height: 64px;
}

/* ===== LOGO ===== */
.sym-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.sym-logo img {
    height: 48px;
    width: auto;
    transition: height var(--transition);
}

.sym-header.sticky .sym-logo img {
    height: 40px;
}

/* Eğer logo yoksa metin logo */
.sym-logo-text {
    font-size: 1rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
}

.sym-logo-text span {
    display: block;
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    opacity: 0.8;
}

/* ===== DESKTOP NAVİGASYON ===== */
.sym-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.sym-nav-item {
    position: relative;
}

.sym-nav-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 10px 14px;
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

button.sym-nav-link,
button.sym-mobile-link {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    background: transparent;
    text-align: left;
    margin: 0;
    cursor: pointer;
}

.sym-nav-link-disabled,
.sym-mobile-link-disabled {
    cursor: default;
}

.sym-nav-link:hover,
.sym-nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.sym-nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.sym-nav-link .dropdown-arrow {
    font-size: 0.65rem;
    transition: transform 0.25s ease;
}

/* ===== DROPDOWN MENÜ ===== */
.sym-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    min-width: 220px;
    background: #fff;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.12);
    border: 1px solid #F0F0F0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    padding: 8px 0;
    z-index: 999;
    list-style: none;
}

.sym-nav-item:hover .sym-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sym-nav-item:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.sym-dropdown-link {
    display: block;
    padding: 10px 20px;
    font-size: 0.875rem;
    color: var(--text);
    transition: var(--transition);
    text-decoration: none;
    font-weight: 500;
    border-left: 3px solid transparent;
}

.sym-dropdown-link:hover {
    color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
    border-left-color: var(--primary);
    padding-left: 24px;
}

/* ===== HEADER EYLEMLER (Sağ Taraf) ===== */
.sym-header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* Dil Seçici */
.sym-lang-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
}

.sym-lang-btn {
    padding: 5px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.7);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.sym-lang-btn:hover,
.sym-lang-btn.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
}

.sym-lang-divider {
    width: 1px;
    height: 16px;
    background: rgba(255, 255, 255, 0.2);
}

/* Mobil Hamburger */
.sym-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--border-radius);
    transition: background var(--transition);
}

.sym-hamburger:hover {
    background: rgba(255, 255, 255, 0.1);
}

.sym-hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
    transform-origin: center;
}

.sym-hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.sym-hamburger.open span:nth-child(2) {
    opacity: 0;
    width: 0;
}

.sym-hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== MOBİL MENÜ ===== */
.sym-mobile-nav {
    position: fixed;
    top: 0;
    right: 0 !important;
    left: auto !important;
    width: 300px;
    max-width: 85vw;
    height: 100vh;
    background: var(--secondary);
    z-index: 2000;
    transform: translateX(100%) !important;
    transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    padding-bottom: 40px;
}

.sym-mobile-nav.open {
    transform: translateX(0) !important;
}

.sym-mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-sm);
    flex-shrink: 0;
}

.sym-mobile-close {
    width: 36px;
    height: 36px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background var(--transition);
}

.sym-mobile-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.sym-mobile-menu {
    list-style: none;
    margin: 0;
    padding: 0 var(--spacing-sm);
    flex: 1;
}

.sym-mobile-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px var(--spacing-sm);
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.935rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    margin-bottom: 2px;
}

.sym-mobile-link:hover,
.sym-mobile-link.active {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.sym-mobile-link.active {
    border-left: 3px solid var(--primary);
}

/* Mobil alt menü toggle */
.sym-mobile-toggle {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    padding: 4px;
    transition: transform 0.25s ease;
}

.sym-mobile-toggle.open {
    transform: rotate(180deg);
}

.sym-mobile-submenu {
    list-style: none;
    padding: 0 0 0 var(--spacing-sm);
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.sym-mobile-submenu.open {
    max-height: 400px;
}

.sym-mobile-sublinkitem {
    display: block;
    padding: 10px var(--spacing-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    margin-bottom: 2px;
}

.sym-mobile-sublinkitem:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

/* Mobil dil seçici */
.sym-mobile-lang {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

/* ===== OVERLAY ===== */
.sym-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1999;
    opacity: 0;
    visibility: hidden;
    backdrop-filter: blur(2px);
    transition: opacity 0.35s ease, visibility 0.35s;
}

.sym-nav-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* Menü açıkken body scroll kilitle */
body.menu-open {
    overflow: hidden;
}

/* ===== SAYFA İÇİN BOŞLUK (Fixed header offset) ===== */
.header-spacer {
    display: none;
}

/* Anasayfada slider navbar arkasına geçsin */
.home-page .header-spacer {
    display: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 991.98px) {
    .sym-nav-desktop {
        display: none;
    }

    .sym-hamburger {
        display: flex;
    }

    .sym-header-actions .sym-lang-switcher {
        display: none;
    }

    /* Mobil navbar dil butonu (hamburger solunda) */
    .sym-mobile-lang-toggle {
        display: flex;
        align-items: center;
    }

    .sym-mobile-lang-toggle .sym-lang-btn {
        font-size: 0.78rem;
        font-weight: 700;
        padding: 5px 11px;
        border-radius: 20px;
        border: 1.5px solid rgba(255,255,255,0.5);
        color: #fff;
        text-decoration: none;
        transition: background 0.2s, color 0.2s;
        background: transparent;
    }

    .sym-mobile-lang-toggle .sym-lang-btn:hover {
        background: rgba(255,255,255,0.15);
    }
}

@media (min-width: 992px) {

    .sym-mobile-nav,
    .sym-nav-overlay,
    .sym-mobile-lang-toggle {
        display: none !important;
    }
}