:root {
    --primary: #003366; 
    --accent: #00a8e8;  
    --white: #FFFFFF;
    --text-dark: #1a1a1a;
    --glass: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* Global */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Montserrat', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: #f8fbff;
    overflow-x: hidden;
}

h1, h2, h3, .logo-main { font-family: 'Playfair Display', serif; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

/* Navigation */
header {
    position: fixed;
    top: 0; width: 100%; z-index: 1000;
    padding: 1.5rem 0; transition: var(--transition);
}
header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    padding: 0.8rem 0; box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}
header.scrolled .logo-main { color: var(--primary); }
header.scrolled .nav-menu a { color: var(--text-dark); }

nav { display: flex; justify-content: space-between; align-items: center; }
.logo a { text-decoration: none; display: flex; flex-direction: column; }
.logo-main { color: var(--white); font-size: 1.8rem; font-weight: 700; letter-spacing: 2px; transition: var(--transition); }
.logo-sub { color: var(--accent); font-size: 0.7rem; font-weight: 600; letter-spacing: 4px; text-align: center; }

.nav-menu { display: flex; list-style: none; gap: 2rem; align-items: center; }
.nav-menu a { text-decoration: none; color: var(--white); font-weight: 600; font-size: 0.9rem; transition: var(--transition); }
.nav-menu a:hover { color: var(--accent); }

.lang-btn {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 5px 12px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    border-radius: 20px;
}

/* Hero */
.hero-section {
    height: 90vh;
    background: url('herobackground.png') center/cover no-repeat;
    display: flex; align-items: center; position: relative; color: var(--white);
}
.hero-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(0,51,102,0.85) 0%, rgba(0,168,232,0.3) 100%);
}
.hero-wrapper { position: relative; z-index: 2; }
.hero-content h1 { font-size: 3.5rem; margin-bottom: 1.5rem; max-width: 850px; line-height: 1.1; }
.hero-content p { font-size: 1.2rem; margin-bottom: 2rem; max-width: 650px; font-weight: 300; }

.btn {
    padding: 1.2rem 2.5rem; text-decoration: none; font-weight: 600;
    border-radius: 4px; display: inline-block; transition: var(--transition);
}
.btn-solid { background: var(--white); color: var(--primary); }
.btn-solid:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }

/* Services Grid (4 Items) */
.services-section { padding: 100px 0; background-color: #f0f4f8; }
.section-header { text-align: center; margin-bottom: 4rem; }
.section-header h2 { font-size: 2.5rem; color: var(--primary); margin-bottom: 1rem; }

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.glass-card {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 3rem 2rem;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition);
}
.glass-card:hover { transform: translateY(-10px); background: rgba(255,255,255,0.9); border-color: var(--accent); }
.card-icon { font-size: 2.8rem; color: var(--accent); margin-bottom: 1.5rem; }
.glass-card h3 { color: var(--primary); margin-bottom: 1rem; }
.glass-card p { font-size: 0.95rem; color: #555; }

/* Trust Section */
.trust-section { padding: 100px 0; }
.trust-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.trust-image img { width: 100%; border-radius: 20px; box-shadow: 0 20px 40px rgba(0,0,0,0.1); }
.trust-item { margin-bottom: 2rem; }
.trust-item h4 { color: var(--primary); font-size: 1.2rem; margin-bottom: 0.5rem; }

/* Footer */
footer { background: #0a1118; color: var(--white); padding: 80px 0 20px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 3rem; }
.footer-bottom { text-align: center; border-top: 1px solid #1a242f; margin-top: 3rem; padding-top: 2rem; opacity: 0.6; }

/* FAB */
.fab-wrapper { position: fixed; bottom: 30px; right: 30px; z-index: 100; }
.fab-main {
    width: 60px; height: 60px; background: #25D366; color: white;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    text-decoration: none; font-size: 2rem; box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}
.pulse { animation: pulse-animation 2s infinite; }
@keyframes pulse-animation {
    0% { box-shadow: 0 0 0 0px rgba(37, 211, 102, 0.5); }
    100% { box-shadow: 0 0 0 20px rgba(37, 211, 102, 0); }
}

/* Mobile */
/* --- MOBİL NAVİGASYON STİLLERİ --- */

/* Masaüstünde butonu gizle */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.8rem; /* Tıklaması kolay olsun diye biraz büyüttüm */
    cursor: pointer;
    z-index: 1001;
    transition: var(--transition);
    padding: 10px; /* Dokunmatik alan genişliği */
}

/* Header aşağı kayınca ikon rengi değişsin */
header.scrolled .mobile-nav-toggle {
    color: var(--primary);
}

/* Menü açıldığında arka plan kaymasını engelle */
body.menu-open {
    overflow: hidden;
}

/* MOBİL GÖRÜNÜM */
@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%; /* Başlangıçta ekranın sağında gizli */
        width: 100%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.85); /* Glass efekti için zemin */
        backdrop-filter: blur(15px); /* Buzlu cam */
        -webkit-backdrop-filter: blur(15px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transition: right 0.5s cubic-bezier(0.77, 0.2, 0.05, 1.0);
        z-index: 1000;
        box-shadow: -10px 0 30px rgba(0,0,0,0.1);
    }

    /* Menü Aktifken */
    .nav-menu.active {
        right: 0;
    }

    /* Link Stilleri */
    .nav-menu a {
        color: var(--primary) !important;
        font-size: 1.6rem;
        letter-spacing: 2px;
        text-transform: uppercase;
        font-weight: 600;
    }

    .lang-btn {
        border-color: var(--primary);
        color: var(--primary);
        font-size: 1.1rem;
        padding: 10px 30px;
    }

    /* İkon Değişimi (Hamburger -> X) */
    .mobile-nav-toggle.active i::before {
        content: "\f00d"; /* FontAwesome X ikonu kodu */
        font-family: "Font Awesome 6 Free"; /* Font ailesini garantiye al */
        font-weight: 900;
    }
    
    /* Mobil düzeltmeler */
    .hero-content h1 { font-size: 2.2rem; }
    .trust-grid { grid-template-columns: 1fr; }
}