:root {
    --primary-color: #0f4c81; /* Classic Blue */
    --secondary-color: #e0f2fe; /* Light Blue */
    --accent-color: #0284c7; /* Vibrant Blue */
    --text-color: #333333;
    --text-light: #666666;
    --white: #ffffff;
    --background: #f8fafc;
    --transition: all 0.3s ease;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-color);
    line-height: 1.6;
    overflow-y: scroll; /* Sayfa kaymasını önler */
}

/* Header & Navigation */
header {
    background-color: #1e293b; /* Sabit Koyu Lacivert / Barut Grisi */
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1000;
}

header .logo-text {
    color: #ffffff !important;
}

header .logo img {
    mix-blend-mode: normal !important;
    filter: brightness(0) invert(1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    max-width: 1440px;
    margin: 0 auto;
}

.logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: -5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #ffffff;
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* Hero Slider */
.hero-slider {
    position: relative;
    height: 45vh;
    min-height: 350px;
    overflow: hidden;
    background-color: var(--primary-color);
    padding: 0 !important;
    margin: 1.5rem auto 0 auto !important;
    max-width: 100% !important;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slide.active {
    opacity: 1;
}

.slide-content {
    text-align: center;
    color: var(--white);
    max-width: 800px;
    padding: 0 20px;
    z-index: 2;
}

.slide-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
    transform: translateY(30px);
    opacity: 0;
    transition: all 1s ease 0.3s;
}

.slide-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
    transform: translateY(30px);
    opacity: 0;
    transition: all 1s ease 0.5s;
}

.slide-content .btn {
    transform: translateY(30px);
    opacity: 0;
    transition: all 1s ease 0.7s;
}

.slide.active .slide-content h1,
.slide.active .slide-content p,
.slide.active .slide-content .btn {
    transform: translateY(0);
    opacity: 1;
}

.btn {
    display: inline-block;
    background-color: var(--white);
    color: var(--primary-color);
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow);
    animation: fadeInUp 1s ease 0.6s forwards;
    opacity: 0;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    background-color: var(--secondary-color);
}

/* Sections General */
section {
    padding: 3rem 5%;
    max-width: 1440px;
    margin: 0 auto;
}

.page-header {
    margin-top: 1.5rem !important;
    background: linear-gradient(135deg, #1e293b 0%, #0f4c81 100%) !important; /* Koyu Lacivert ile Klasik Mavi geçişi */
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Services */
.services-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 2rem;
}
@media (min-width: 768px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .services-grid { grid-template-columns: repeat(4, 1fr); }
}

.service-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-bottom: 4px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-bottom: 4px solid var(--accent-color);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: inline-block;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.service-card p {
    color: var(--text-light);
}

/* Project & Referans Cards */
.project-card {
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-bottom: 4px solid transparent;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    border-bottom: 4px solid var(--accent-color);
}
.project-img {
    width: 100%;
    height: 250px;
    object-fit: contain;
    background-color: #f8fafc;
    padding: 1.5rem;
    border-radius: 15px 15px 0 0;
}
.project-info {
    padding: 2rem;
    text-align: center;
    flex: 1;
}
.project-info h3 {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
    font-weight: 800;
    text-transform: uppercase;
}
.project-info p {
    color: var(--text-light);
}

/* Footer */
.site-footer {
    background-color: #0f172a;
    color: #e2e8f0;
    padding: 2.5rem 5% 1rem 5%;
    font-size: 0.95rem;
    margin-top: 1rem;
}

.footer-container {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    color: #f59e0b;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.footer-col.brand-col p {
    margin-bottom: 1.5rem;
    color: #cbd5e1;
    line-height: 1.8;
}

.social-icons {
    display: flex;
    gap: 10px;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 35px;
    height: 35px;
    background-color: #1e293b;
    color: #f8fafc;
    border-radius: 50%;
    text-decoration: none;
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: #f59e0b;
}

.footer-title {
    color: #f59e0b;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.footer-col.menu-col ul {
    list-style: none;
}

.footer-col.menu-col ul li {
    margin-bottom: 0.8rem;
}

.footer-col.menu-col ul li a {
    color: #cbd5e1;
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-col.menu-col ul li a:hover {
    color: #f59e0b;
}

.footer-col.contact-col p {
    margin-bottom: 0.8rem;
    color: #cbd5e1;
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 1.5rem;
    text-align: center;
    color: #94a3b8;
    font-size: 0.85rem;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* Animations */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
}

/* Video Wrapper Fix */
.video-container {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: 2rem;
}
@media (min-width: 768px) {
    .video-container { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .video-container { grid-template-columns: repeat(4, 1fr); }
}
.video-card {
    background: white;
    border-radius: 10px;
    padding: 1rem;
    box-shadow: var(--shadow);
}
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: 8px;
    background: #000;
}
.video-wrapper iframe,
.video-wrapper video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Scroll Brand Bar */
.scroll-brand-bar {
    position: fixed;
    top: -90px;
    left: 0;
    width: 100%;
    height: 75px;
    background-color: rgba(30, 41, 59, 0.75); /* Koyu Lacivert / Barut Grisi, düşük opaklık */
    backdrop-filter: blur(8px);
    z-index: 10001;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: top 0.4s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}
.scroll-brand-bar.visible {
    top: 0;
}
.scroll-brand-bar h2 {
    color: #e2e8f0; /* Koyu beyaz */
    margin: 0;
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: 2px;
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    text-decoration: none;
}
.scroll-to-top:hover {
    background-color: #1e293b;
    color: white;
    transform: translateY(-5px);
}
.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
/* Mobile Responsive Design */
.menu-toggle { display: none; color: white; font-size: 1.8rem; cursor: pointer; }
@media (max-width: 900px) {
    .menu-toggle { display: block; }
    .nav-links { display: none; flex-direction: column; width: 100%; position: absolute; top: 100%; left: 0; background-color: #1e293b; padding: 1rem 0; box-shadow: 0 5px 10px rgba(0,0,0,0.3); }
    .nav-links.active { display: flex; }
    .nav-links li { margin: 0; text-align: center; padding: 15px 0; width: 100%; }
    .nav-links a { display: block; width: 100%; }
    .hero-slider, .hero-slider .slide { height: 50vh !important; min-height: 300px !important; }
    .hero-slider h1 { font-size: 2rem !important; }
    .footer-container { grid-template-columns: 1fr; text-align: center; gap: 2rem; }
    .footer-col h3::after { left: 50%; transform: translateX(-50%); }
    .social-links { justify-content: center; }
    .logo-text { font-size: 1.3rem !important; }
    .navbar { padding: 1rem 5%; }
    .scroll-brand-bar h2 { font-size: 1.1rem; }
    .contact-container, .about-content { flex-direction: column; }
}
/* WhatsApp Float Button */
.whatsapp-float { position: fixed; width: 60px; height: 60px; bottom: 100px; right: 30px; background-color: #25d366; color: #FFF; border-radius: 50px; text-align: center; font-size: 35px; box-shadow: 2px 2px 10px rgba(0,0,0,0.3); z-index: 100; display: flex; align-items: center; justify-content: center; text-decoration: none; transition: 0.3s; animation: pulse-wa 2s infinite; }
.whatsapp-float:hover { background-color: #128C7E; transform: scale(1.1); }
@keyframes pulse-wa { 0% { box-shadow: 0 0 0 0 rgba(37,211,102,0.7); } 70% { box-shadow: 0 0 0 15px rgba(37,211,102,0); } 100% { box-shadow: 0 0 0 0 rgba(37,211,102,0); } }
@media (max-width: 768px) { .whatsapp-float { width: 50px; height: 50px; bottom: 80px; right: 20px; font-size: 30px; } }

/* Slider Buttons */
.slider-btn { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(0,0,0,0.5); color: white; border: none; padding: 15px 20px; font-size: 24px; cursor: pointer; border-radius: 50%; z-index: 10; transition: 0.3s; }
.slider-btn:hover { background: var(--accent-color); }
.slider-prev { left: 20px; }
.slider-next { right: 20px; }
@media (max-width: 768px) { .slider-btn { padding: 10px 15px; font-size: 18px; } }