.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--color-bg) 75%, transparent); 
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-soft);
}

.site-header.is-scrolled .header-row {
    min-height: 64px; 
}

.site-header.is-scrolled .brand-mark,
.site-header.is-scrolled .brand-logo-image {
    width: 36px;
    height: 36px;
}

[data-theme="light"] .site-header {
    background: color-mix(in srgb, var(--color-bg) 85%, transparent);
}

/* Dark / Light Logo Animasyonu */
.brand-logo-image img {
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

[data-theme="light"] .logo-dark-variant { display: none; }
[data-theme="dark"] .logo-light-variant { display: none; }

.header-row {
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: space-between;
    padding: 12px 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    flex-shrink: 0;
    transition: transform var(--transition-fast);
    text-decoration: none;
}

.brand:hover {
    transform: scale(1.02);
}

.brand-mark,
.brand-logo-image {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-button);
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    transition: all 0.3s ease;
}

.brand-mark {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    color: #fff;
    font-size: 1.2rem;
    box-shadow: 0 8px 16px color-mix(in srgb, var(--color-primary) 25%, transparent);
}

.brand-logo-image {
    overflow: hidden;
    background: transparent;
    border: none;
}

.brand-logo-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.brand-text {
    font-size: 1.25rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.header-main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-main-nav .nav-item {
    padding: 8px 16px;
    border-radius: var(--radius-button);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-muted);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.header-main-nav .nav-item:hover:not(.is-disabled) {
    color: var(--color-text);
    background: var(--color-surface-2);
}

.header-main-nav .nav-item.is-active {
    color: var(--color-primary);
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
}

.header-main-nav .nav-item.is-disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* =========================
   İNLINE ARAMA FORMU
========================= */
.header-search {
    flex: 1 1 200px;
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 400px;
    margin: 0 auto;
}

.header-search input {
    width: 100%;
    min-height: 44px;
    border-radius: var(--radius-input);
    background: var(--color-surface-2);
    padding: 0 20px;
    border: 1px solid transparent;
}

.header-search input:focus {
    background: var(--color-surface);
    border-color: var(--color-primary);
}

.header-search button {
    min-height: 44px;
    padding: 0 20px;
    border-radius: var(--radius-button);
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 4px 12px color-mix(in srgb, var(--color-primary) 25%, transparent);
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.header-search button:hover {
    transform: translateY(-2px);
    background: var(--color-primary-hover);
}

/* =========================
   Actions Alanı
========================= */
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: nowrap;
    justify-content: flex-end;
}

.header-ask-btn { font-weight: 700; }

.icon-btn--compact {
    width: 40px !important;
    height: 40px !important;
    font-size: 0.95rem;
}

.btn-sm {
    min-height: 40px !important;
    padding: 0 16px !important;
    font-size: 0.9rem !important;
}

.mobile-only { display: none !important; }
.position-relative { position: relative; }

/* =========================
   BİLDİRİM ROZETİ VE DROPDOWN
========================= */
.notif-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--color-danger);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 800;
    height: 18px;
    min-width: 18px;
    border-radius: 9px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
    box-shadow: 0 0 0 2px var(--color-bg);
}

.notif-dropdown-menu {
    width: 320px !important;
    padding: 12px !important;
}

.notif-list-mini {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 300px;
    overflow-y: auto;
}

.notif-item-mini {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px;
    border-radius: var(--radius-input);
    text-decoration: none;
    color: var(--color-text);
    transition: background var(--transition-fast);
    position: relative;
}

.notif-item-mini:hover { background: var(--color-surface-2); }
.notif-item-mini.is-read { opacity: 0.6; }

.notif-item-icon {
    width: 32px; height: 32px; border-radius: 50%;
    display: grid; place-items: center; flex-shrink: 0; font-size: 0.9rem;
}

.notif-item-content { flex: 1; min-width: 0; }
.notif-item-content p { margin: 0; font-size: 0.85rem; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.notif-item-content .time { font-size: 0.75rem; color: var(--color-muted); margin-top: 4px; display: block; }

.unread-dot {
    position: absolute; right: 12px; top: 16px;
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--color-primary);
}

/* =========================
   PROFIL DROPDOWN
========================= */
.dropdown-wrapper {
    position: relative;
    display: inline-block;
    z-index: 100;
}

.header-profile-trigger {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 4px 14px 4px 4px;
    border-radius: var(--radius-button);
    background: var(--color-surface-2);
    border: 1px solid var(--border-color);
    cursor: pointer;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.header-profile-trigger:hover,
.header-profile-trigger[aria-expanded="true"] {
    background: var(--color-surface-hover);
    border-color: var(--border-color-strong);
}

.header-profile-trigger[aria-expanded="true"] .header-user-icon {
    transform: rotate(180deg);
}

.header-profile-name {
    display: inline-block;
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 600;
    color: var(--color-text);
    font-size: 0.9rem;
}

.header-user-icon {
    margin-left: 4px;
    color: var(--color-muted);
    font-size: 0.8rem;
    transition: transform var(--transition-fast);
}

.avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid transparent;
    background: var(--color-surface-hover);
    flex: 0 0 auto;
}

.avatar--sm { width: 32px; height: 32px; }

.profile-avatar-img { width: 100%; height: 100%; object-fit: cover; }
.avatar-frame-male { border-color: #60a5fa; box-shadow: 0 0 0 2px color-mix(in srgb, #60a5fa 20%, transparent); }
.avatar-frame-female { border-color: #f472b6; box-shadow: 0 0 0 2px color-mix(in srgb, #f472b6 20%, transparent); }
.avatar-frame-neutral { border-color: #a1a1aa; box-shadow: 0 0 0 2px color-mix(in srgb, #a1a1aa 20%, transparent); }

.dropdown-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 240px;
    background: var(--color-surface);
    border: 1px solid var(--border-color-strong);
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-hover);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: top right;
    z-index: 101;
}

.dropdown-menu.is-active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-header { padding: 12px 16px; display: flex; flex-direction: column; gap: 4px; }
.dropdown-header strong { font-size: 1rem; color: var(--color-text); }
.dropdown-header span { font-size: 0.8rem; color: var(--color-muted); word-break: break-all; }
.dropdown-divider { height: 1px; background: var(--border-color); margin: 8px 0; }

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-radius: var(--radius-input);
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.dropdown-item i { font-size: 1.1rem; color: var(--color-muted); width: 20px; text-align: center; }
.dropdown-item:hover { background: var(--color-surface-2); color: var(--color-text); transform: translateX(4px); }
.dropdown-item:hover i { color: var(--color-primary); }
.dropdown-item--danger:hover { background: color-mix(in srgb, var(--color-danger) 10%, transparent); color: var(--color-danger); }
.dropdown-item--danger:hover i { color: var(--color-danger); }

/* =========================
   SUB-HEADER (Alt Yatay Menü)
========================= */
.site-subheader {
    height: 48px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    overflow: hidden;
    transition: height var(--transition-smooth), opacity var(--transition-smooth), border-color var(--transition-smooth);
}

.site-header.is-scrolled .site-subheader {
    height: 0;
    opacity: 0;
    border-top-color: transparent;
    pointer-events: none;
}

.subheader-nav {
    display: flex;
    align-items: center;
    gap: 24px;
    overflow-x: auto;
    scrollbar-width: none; /* Firefox */
}
.subheader-nav::-webkit-scrollbar { display: none; } /* Chrome/Safari */

.subheader-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-muted);
    white-space: nowrap;
    padding: 12px 0;
    transition: color var(--transition-fast);
    text-decoration: none;
}

.subheader-item i {
    font-size: 1rem;
    opacity: 0.7;
}

.subheader-item:hover {
    color: var(--color-text);
}
.subheader-item:hover i {
    color: var(--color-primary);
    opacity: 1;
}

/* =========================
   SAĞDAN AÇILAN PANEL (Slide Menu)
========================= */
.grid-slide-overlay {
    position: fixed;
    inset: 0;
    background: color-mix(in srgb, #000 60%, transparent);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 9000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-smooth);
}

.grid-slide-overlay.is-active { opacity: 1; visibility: visible; }

.grid-slide-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 380px; 
    height: 100vh;
    background: var(--color-bg);
    box-shadow: -8px 0 32px rgba(0,0,0,0.3);
    z-index: 9001;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
    border-left: 1px solid var(--border-color);
}

.grid-slide-panel.is-open { transform: translateX(0); }

.grid-slide-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.grid-slide-actions { display: flex; gap: 8px; align-items: center; }
.grid-slide-content { padding: 24px; overflow-y: auto; flex: 1; }

.grid-slide-footer {
    padding: 24px;
    border-top: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    background: var(--color-surface);
}

.slide-menu-list { display: flex; flex-direction: column; gap: 4px; }

.slide-list-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    border-radius: var(--radius-input);
    color: var(--color-text);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05rem;
    transition: all var(--transition-fast);
}

.slide-list-item i {
    font-size: 1.2rem;
    color: var(--color-muted);
    width: 24px;
    text-align: center;
    transition: color var(--transition-fast);
}

.slide-list-item:hover:not(.is-disabled) {
    background: var(--color-surface-2);
    transform: translateX(6px);
}

.slide-list-item:hover:not(.is-disabled) i { color: var(--color-primary); }

.slide-list-item.is-active {
    background: color-mix(in srgb, var(--color-primary) 12%, transparent);
    color: var(--color-primary);
}

.slide-list-item.is-active i { color: var(--color-primary); }

.slide-list-item.is-disabled { opacity: 0.5; cursor: not-allowed; }

.grid-slide-footer .slide-list-item {
    background: var(--color-surface-2);
    justify-content: center;
    padding: 12px;
}

.grid-slide-footer .slide-list-item:hover:not(.is-disabled) {
    transform: translateY(-2px);
    background: var(--color-surface-hover);
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 992px) {
    .desktop-only { display: none !important; }
    .mobile-only { display: inline-flex !important; }
    .header-row { flex-wrap: nowrap; justify-content: space-between; }
    .header-profile-trigger { padding: 4px; border-radius: 50%; }
    .header-profile-name { display: none; }
}

@media (max-width: 480px) {
    .brand-text { display: none; }
    .ask-btn-text { display: none; }
    .header-ask-btn { padding: 0 !important; width: 40px !important; border-radius: 50%; justify-content: center; }
    .grid-slide-panel { width: 85%; }
}

/* =========================
   EKSİK OLAN BİLDİRİM VE TOAST SINIFLARI EKLENDİ
========================= */
.notif-header-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 8px;
}

.notif-new-badge {
    font-size: 0.75rem;
    background: var(--color-danger);
    color: #fff;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: bold;
}

.mt-0 { margin-top: 0 !important; }

.notif-empty-state {
    padding: 16px;
    text-align: center;
    color: var(--color-muted);
    font-size: 0.85rem;
}

.notif-see-all {
    justify-content: center;
    font-weight: 600;
    color: var(--color-primary);
}

.notif-theme-green { color: #10b981; background: color-mix(in srgb, #10b981 15%, transparent); }
.notif-theme-purple { color: #8b5cf6; background: color-mix(in srgb, #8b5cf6 15%, transparent); }
.notif-theme-orange { color: #f59e0b; background: color-mix(in srgb, #f59e0b 15%, transparent); }
.notif-theme-blue { color: #3b82f6; background: color-mix(in srgb, #3b82f6 15%, transparent); }
.notif-theme-gray { color: var(--color-muted); background: var(--color-surface-hover); }

/* Toast Bildirim (Kopyalama İşlemi İçin) */
.copy-toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--color-success);
    color: #fff;
    padding: 12px 20px;
    border-radius: var(--radius-button);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    z-index: 9999;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    pointer-events: none;
}

.copy-toast.is-visible {
    opacity: 1;
    transform: translateY(0);
}