/* ═══════════════════════════════════════════════════════════════
   LAYOUT — Navigation, Footer, Container, Section
   ═══════════════════════════════════════════════════════════════ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: clamp(1rem, 4vw, 2rem);
}

.container--wide {
    max-width: var(--container-wide);
}

section {
    padding-block: var(--section-pad-y);
    position: relative;
}

/* ─────────────── NAVBAR ─────────────── */

.nav {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: saturate(180%) blur(14px);
    -webkit-backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: background var(--transition-smooth),
                border-color var(--transition-smooth),
                box-shadow var(--transition-smooth);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    max-width: var(--container-wide);
    margin-inline: auto;
    padding: var(--space-md) clamp(1rem, 4vw, 2rem);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.nav-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    transition: opacity var(--transition-fast);
}

.nav-logo:hover { opacity: 0.85; }

.nav-logo img {
    height: 44px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: clamp(1rem, 1.6vw, 1.75rem);
    align-items: center;
}

.nav-link {
    font-size: clamp(0.75rem, 0.68rem + 0.2vw, 0.85rem);
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--gray-700);
    position: relative;
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    inset: auto 0 -2px 0;
    height: 2px;
    background: var(--navy-700);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-smooth);
}

.nav-link:hover,
.nav-link.is-active {
    color: var(--navy-800);
}

.nav-link:hover::after,
.nav-link.is-active::after {
    transform: scaleX(1);
    transform-origin: left;
}

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

.lang-switch {
    display: inline-flex;
    align-items: center;
    padding: 3px;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: var(--white);
    gap: 2px;
    transition: border-color var(--transition-fast);
}

.lang-switch:hover { border-color: var(--navy-600); }

.lang-switch-btn {
    padding: 6px 12px;
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--gray-500);
    border-radius: var(--radius-pill);
    letter-spacing: 0.05em;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.lang-switch-btn.is-active {
    background: var(--navy-800);
    color: var(--white);
}

.lang-switch-btn:hover:not(.is-active) {
    color: var(--navy-800);
}

/* Hamburger */
.hamburger-btn {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.hamburger-btn:hover { background: var(--gray-100); }

.hamburger-line {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--navy-800);
    border-radius: 1px;
    transition: transform var(--transition-smooth),
                opacity var(--transition-smooth);
    transform-origin: center;
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu (slide-in) */
.mobile-menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(12, 45, 72, 0.45);
    backdrop-filter: blur(4px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth);
    z-index: 1000;
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(360px, 86vw);
    background: var(--white);
    z-index: 1001;
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
    display: flex;
    flex-direction: column;
    padding: var(--space-xl) var(--space-lg) var(--space-lg);
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

.mobile-menu.active {
    transform: translateX(0);
}

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

.mobile-menu-logo img { height: 40px; width: auto; }

.mobile-close-btn {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-pill);
    background: var(--navy-800);
    color: var(--white);
    transition: background var(--transition-fast), transform var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.mobile-close-btn:hover {
    background: var(--navy-900);
    transform: rotate(90deg);
}

.mobile-close-btn svg { width: 26px; height: 26px; stroke-width: 2.5; }

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.mobile-nav-link {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--navy-800);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--border-soft);
    transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
    color: var(--red-600);
}

.mobile-menu-footer {
    margin-top: auto;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.mobile-menu-footer a {
    color: var(--navy-800);
    font-weight: 500;
}

/* ─────────────── FOOTER ─────────────── */

.footer {
    background: var(--navy-900);
    color: rgba(255, 255, 255, 0.78);
    padding-block: var(--space-3xl) var(--space-xl);
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    inset: 0 0 auto 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(220, 20, 60, 0.5) 50%,
        transparent 100%);
}

.footer-inner {
    max-width: var(--container-wide);
    margin-inline: auto;
    padding-inline: clamp(1rem, 4vw, 2rem);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand img {
    height: 56px;
    width: auto;
    margin-bottom: var(--space-md);
    background: rgba(255, 255, 255, 0.96);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
}

.footer-brand .tagline {
    color: rgba(255, 255, 255, 0.95);
    font-family: var(--font-display);
    font-style: italic;
    font-size: var(--text-sm);
    margin-bottom: var(--space-sm);
}

.footer-brand p:last-child {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.footer-column h4 {
    color: var(--white);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: var(--text-sm);
}

.footer-links a,
.footer-links span {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    justify-content: space-between;
    align-items: center;
}

.footer-copyright {
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.6);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
}

.footer-copyright strong {
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-display);
    font-style: italic;
    font-weight: 400;
}

.footer-values {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.footer-value {
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 4px 10px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-pill);
    color: rgba(255, 255, 255, 0.85);
}

/* ─────────────── Responsive ─────────────── */

@media (max-width: 1024px) {
    .footer-main {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl) var(--space-lg);
    }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger-btn { display: flex; align-items: center; }

    .footer-main {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ─────────────── Nav: Bilgi Bankası dropdown (desktop mega-menu) ─────────────── */

/* Mobil menü açıkken arka plan scroll'unu kilitle */
.nav-scroll-lock,
.nav-scroll-lock body {
    overflow: hidden;
    touch-action: none;
}

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

/* Dropdown göstergesi (chevron) */
.nav-item-dropdown > .nav-link {
    padding-right: 15px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230c4a6e' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right center;
    background-size: 9px;
}

.nav-item-dropdown > .nav-link::after {
    right: 15px;
}

.nav-item-dropdown:hover > .nav-link,
.nav-item-dropdown:focus-within > .nav-link {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23dc143c' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='18 15 12 9 6 15'/%3E%3C/svg%3E");
}

.nav-dropdown {
    position: absolute;
    top: calc(100% + 14px);
    right: 0;
    display: grid;
    grid-template-columns: repeat(5, minmax(140px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: 60;
}

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

.mkb-nav-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2xs);
}

.mkb-nav-group-title {
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--navy-800);
    margin-bottom: var(--space-2xs);
    padding-bottom: var(--space-2xs);
    border-bottom: 1px solid var(--border-soft);
}

.mkb-nav-link {
    font-size: var(--text-sm);
    color: var(--gray-600);
    padding: 3px 0;
    transition: color var(--transition-fast);
}

.mkb-nav-link:hover {
    color: var(--red-600);
}

@media (max-width: 1100px) {
    .nav-dropdown {
        grid-template-columns: repeat(3, minmax(130px, 1fr));
    }
}

/* ─────────────── Mobil menü: Bilgi Bankası alt menüsü ─────────────── */

.mobile-nav-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-soft);
}

.mobile-nav-row .mobile-nav-link {
    border-bottom: none;
    flex: 1;
}

.mobile-submenu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--navy-800);
    flex-shrink: 0;
}

.mobile-submenu-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.mobile-submenu-toggle[aria-expanded="true"] .mobile-submenu-icon {
    transform: rotate(180deg);
}

.mobile-submenu {
    display: none;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-sm) 0 var(--space-xs) var(--space-md);
}

.mobile-submenu[data-expanded="true"] {
    display: flex;
}

.mobile-submenu .mkb-nav-group {
    gap: 2px;
}

.mobile-submenu .mkb-nav-group-title {
    margin-top: var(--space-xs);
}

.mobile-submenu .mkb-nav-link {
    font-size: var(--text-sm);
    padding: 4px 0;
}

/* ─────────────── Footer arka plan loop video ─────────────── */

.footer-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.16;
    z-index: 0;
    pointer-events: none;
}

.footer-video-overlay {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: linear-gradient(180deg,
        rgba(12, 45, 72, 0.55) 0%,
        rgba(12, 45, 72, 0.82) 60%,
        var(--navy-900) 100%);
}

.footer-inner {
    position: relative;
    z-index: 1;
}

@media (prefers-reduced-motion: reduce) {
    .footer-video { display: none; }
}