:root {
    --gsb-red: #e30a17;
    --gsb-blue: #007b8a;
    --gsb-dark: #003d4d;
    --gsb-light-blue: #f0f8fa;
    --muted: #6b7785;
    --card-bg: #ffffff;
    --accent: #00a1b0;
    --max-width: 1200px;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 15px 40px rgba(0, 61, 77, 0.12);
    --radius: 24px;
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    margin: 0;
    background: #f8fafd;
    color: #113;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    /* Mobilde alt bar olduğu için padding veriyoruz, masaüstünde sıfırlayacağız */
    padding-bottom: 0;
}

/* --- HEADER --- */
header {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    height: 80px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4%;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all .3s ease
}

header.shrink {
    height: 64px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06)
}

.logos {
    display: flex;
    align-items: center;
    gap: 16px
}

.logos img {
    height: 48px;
    transition: height .3s
}

header.shrink .logos img {
    height: 40px
}

/* Desktop Nav */
nav.desktop-nav {
    display: flex;
    gap: 24px;
    align-items: center
}

nav.desktop-nav a {
    color: var(--gsb-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all .2s
}

nav.desktop-nav a:hover {
    background: var(--gsb-light-blue);
    color: var(--gsb-blue)
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--gsb-blue);
    color: #fff;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all .25s ease;
    border: 1px solid transparent;
    box-shadow: 0 4px 14px rgba(0, 123, 138, 0.2)
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 123, 138, 0.3)
}

.btn.secondary {
    background: transparent;
    color: var(--gsb-dark);
    border-color: rgba(0, 61, 77, 0.15);
    box-shadow: none
}

.btn.secondary:hover {
    border-color: var(--gsb-dark);
    background: rgba(0, 61, 77, 0.03)
}

/* Hamburger Icon */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1100;
    flex-direction: column;
    gap: 6px;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    transition: background .2s;
}

.hamburger:active {
    background: rgba(0, 0, 0, 0.05)
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gsb-dark);
    border-radius: 2px;
    transition: all .3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* --- HERO SLIDER --- */
.hero-wrapper {
    margin-top: 100px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-slider-container {
    width: 92%;
    max-width: 1100px;
    height: 420px;
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: #eee;
}

.slides {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1)
}

.slide {
    min-width: 100%;
    height: 100%;
    position: relative
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block
}

.slide-content {
    position: absolute;
    bottom: 40px;
    left: 40px;
    max-width: 550px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(20px);
    opacity: 0;
    transition: all .5s ease .3s;
}

.slide.active .slide-content {
    transform: translateY(0);
    opacity: 1
}

.slide-content h2 {
    margin: 0 0 8px;
    color: var(--gsb-blue);
    font-size: 24px;
    line-height: 1.2
}

.slide-content p {
    margin: 0;
    color: var(--muted);
    font-size: 15px
}

.slider-arrows {
    position: absolute;
    bottom: 40px;
    right: 40px;
    display: flex;
    gap: 12px;
    z-index: 10
}

.arrow {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--gsb-dark);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: all .2s
}

.arrow:hover {
    background: var(--gsb-blue);
    color: #fff;
    transform: scale(1.05)
}

.hero-text-section {
    text-align: center;
    max-width: 800px;
    margin: 30px auto 10px;
    padding: 0 20px;
}

.hero-text-section h1 {
    font-size: 28px;
    color: var(--gsb-dark);
    margin-bottom: 10px;
}

.hero-text-section p {
    color: var(--muted);
    font-size: 16px;
    margin-bottom: 20px
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap
}

.btn.primary-lg {
    padding: 12px 32px;
    font-size: 16px;
    background: linear-gradient(135deg, var(--gsb-blue), var(--accent));
    box-shadow: 0 8px 20px rgba(0, 123, 138, 0.25)
}

/* --- COMMON SECTIONS --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 20px
}

.section-title {
    text-align: center;
    margin-bottom: 40px
}

.section-title h2 {
    font-size: 28px;
    color: var(--gsb-dark);
    margin: 0
}

.section-title span {
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gsb-blue);
    margin: 12px auto 0;
    border-radius: 2px
}

/* --- PARTNERS MARQUEE (GÜNCELLENDİ) --- */
.partners-section {
    background: #fff;
    padding: 60px 0;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
    overflow: hidden;
    position: relative
}

.partners-header {
    text-align: center;
    margin-bottom: 40px;
    color: var(--muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-size: 13px
}

.marquee-wrapper {
    width: 100%;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
    /* Kenarlarda yumuşak geçiş efekti */
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee-track {
    display: inline-flex;
    gap: 80px;
    /* Logolar arası boşluk */
    animation: scroll-left 35s linear infinite;
}

.marquee-track img {
    height: 50px;
    width: auto;
    opacity: 0.6;
    transition: all .3s ease;
    filter: grayscale(100%);
    cursor: pointer;
}

.marquee-track img:hover {
    opacity: 1;
    filter: grayscale(0%);
    transform: scale(1.1)
}

@keyframes scroll-left {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
    }
}

/* --- MAP & FAQ --- */
.map-container {
    background: #fff;
    padding: 40px;
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.map-svg-wrapper {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.tr-map path {
    fill: #e0e6ed;
    stroke: #fff;
    stroke-width: 1;
    transition: all 0.3s ease;
    cursor: pointer;
}

.tr-map path:hover {
    fill: var(--gsb-blue);
    transform: translateY(-2px);
    filter: drop-shadow(0 4px 6px rgba(0, 123, 138, 0.3));
}

.map-dot {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--gsb-red);
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    animation: pulse 2s infinite;
    pointer-events: none;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(227, 10, 23, 0.4);
    }

    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(227, 10, 23, 0);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(227, 10, 23, 0);
    }
}

.faq-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    background: #fff;
    border-radius: 12px;
    margin-bottom: 12px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.accordion-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: var(--gsb-dark);
    background: #fff;
    transition: background 0.2s;
}

.accordion-header:hover {
    background: #f9fbfd;
}

.accordion-header span {
    font-size: 20px;
    color: var(--gsb-blue);
    transition: transform 0.3s;
}

.accordion-item.active .accordion-header span {
    transform: rotate(45deg);
    color: var(--gsb-red);
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: #fcfdfe;
}

.accordion-body p {
    padding: 0 20px 20px 20px;
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

/* --- FOOTER --- */
footer {
    background: var(--gsb-dark);
    color: #fff;
    padding-top: 60px;
    padding-bottom: 40px; /* Alt boşluk düzenlendi */
    font-size: 15px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px
}

.footer-col h4 {
    color: #fff;
    margin-bottom: 20px;
    font-size: 18px;
    position: relative;
    display: inline-block
}

.footer-col h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 30px;
    height: 3px;
    background: var(--accent);
    border-radius: 2px
}

.footer-links a {
    display: block;
    color: #cfe7ee;
    text-decoration: none;
    margin-bottom: 10px;
    transition: padding-left .2s, color .2s
}

.footer-links a:hover {
    color: #fff;
    padding-left: 6px
}

.social-icons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    transition: all 0.3s;
    text-decoration: none;
}

.social-btn:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

.footer-bottom {
    background: rgba(0, 0, 0, 0.2);
    padding: 20px;
    text-align: center;
    margin-top: 60px;
    font-size: 14px;
    color: #8ba6b0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px
}

/* --- MOBILE STICKY BAR --- */
.mobile-nav-bar {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 20px;
    border-radius: 50px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    z-index: 999;
    align-items: center;
    justify-content: space-around; /* İkonları eşit dağıt */
    border: 1px solid rgba(255, 255, 255, 0.5);
    white-space: nowrap;
    width: 92%; /* Genişletildi */
    max-width: 460px; /* Çok büyük ekranlarda yayılmasın */
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--muted);
    font-size: 11px;
    gap: 5px;
    flex: 1;
}

.mobile-nav-item svg {
    width: 24px; /* İkonlar az büyütüldü */
    height: 24px;
    fill: currentColor
}

.mobile-nav-item.active {
    color: var(--gsb-blue)
}

/* --- RESPONSIVE --- */
@media (max-width: 992px) {
    /* Desktop Menü Gizle, Hamburger Göster */
    .desktop-nav,
    .header-actions .btn {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .header-actions {
        gap: 0;
        margin-left: auto;
    }

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

    .main-slider-container {
        width: 94%;
        height: 360px;
    }
    
    /* Mobilde alt bar var, footer altı boşluk kalsın */
    body {
        padding-bottom: 90px; 
    }
}

@media (max-width: 600px) {
    header {
        padding: 0 20px
    }

    .container {
        padding: 40px 20px
    }

    .main-slider-container {
        height: 300px;
        border-radius: 16px;
        width: 94%;
    }

    .slide-content {
        display: none
    }

    .hero-text-section h1 {
        font-size: 24px
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px
    }

    .footer-bottom {
        justify-content: center;
        flex-direction: column
    }

    .mobile-nav-bar {
        display: flex
    }
    
    .marquee-track {
        gap: 50px;
    }
}

/* FULLSCREEN MENU OVERLAY */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: #fff;
    z-index: 1050;
    padding: 100px 30px 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transform: translateY(-100%);
    transition: transform .4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
}

.mobile-menu-overlay.open {
    transform: translateY(0)
}

.mobile-menu-link {
    font-size: 22px;
    font-weight: 600;
    color: var(--gsb-dark);
    text-decoration: none;
    border-bottom: 1px solid #f0f0f0;
    padding-bottom: 15px;
    display: block;
}

.mobile-auth-btns {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all .8s ease
}

.reveal.active {
    opacity: 1;
    transform: translateY(0)
}