*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    overflow-x: hidden;
    width: 100vw;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
    box-sizing: border-box;
}

/* Üst Bilgi (Header) */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--dark-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70px;
    height: auto;
    gap: 1.5rem;
    padding: 0.5rem 0;
}

@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem 0;
    }
    .header-actions {
        width: 100%;
    }
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: -0.05em;
    display: flex;
    align-items: center;
    gap: 0;
    transition: transform 0.3s ease;
}

/* Tema Duyarlı Logolar */
[data-theme="dark"] .logo-img-light { display: none !important; }
[data-theme="dark"] .logo-img-dark { display: block !important; }
[data-theme="light"] .logo-img-light { display: block !important; }
[data-theme="light"] .logo-img-dark { display: none !important; }

.logo span {
    font-weight: 300;
    color: var(--text-secondary);
    margin-left: 1px;
}

.logo::after {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--primary-500);
    border-radius: 50%;
    margin-left: 4px;
    transform: translateY(-2px);
    box-shadow: 0 0 12px var(--primary-500);
}

.logo:hover {
    transform: scale(1.05);
}

.main-nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--hover-color, var(--primary-500));
    transition: width var(--transition-base);
    box-shadow: 0 0 10px var(--hover-color, transparent);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Sayfa Düzeni Izgarası (Layout Grid) */
.layout-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 2rem;
    padding-top: 2rem;
    padding-bottom: 4rem;
}

@media (max-width: 992px) {
    .layout-grid {
        grid-template-columns: minmax(0, 1fr);
    }
    .main-nav {
        display: none; /* Mobil menü daha sonra eklenecek */
    }
}