:root {
    --bg-main: #0b0f19;
    --bg-card: #151c2e;
    --accent-blue: #00d2ff;
    --accent-gold: #ffb703;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
}

/* Navbar (JS'siz Arka Plan Şeffaflığı ve Sabitlenme) */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(11, 15, 25, 0.95);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.2rem 2rem;
    position: relative;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: 1.5rem;
    color: #fff;
    text-decoration: none;
    letter-spacing: 1px;
}

.logo i, .logo span { color: var(--accent-blue); }

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

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.3s;
}

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

/* Saf CSS Mobil Menü Kontrolleri (Checkbox Hack) */
.menu-checkbox {
    display: none;
}

.menu-icon {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 1rem;
    background: radial-gradient(circle at center, #1a233a 0%, var(--bg-main) 70%);
}

.hero-badge {
    background: rgba(0, 210, 255, 0.1);
    color: var(--accent-blue);
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 2px;
    border: 1px solid rgba(0, 210, 255, 0.3);
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 900;
    margin: 1.5rem 0;
    letter-spacing: 2px;
}

.hero-content p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    max-width: 650px;
    margin: 0 auto 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.btn {
    padding: 0.9rem 2rem;
    border-radius: 6px;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    text-decoration: none;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--accent-blue);
    color: #000;
}

.btn-primary:hover {
    box-shadow: 0 0 20px rgba(0, 210, 255, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    border: 2px solid #fff;
    color: #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #000;
    transform: translateY(-2px);
}

/* Section Yapısı */
section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    letter-spacing: 2px;
}

.title-underline {
    width: 60px;
    height: 4px;
    background: var(--accent-blue);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

.about-lead {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
    font-size: 1.15rem;
    color: var(--text-secondary);
}

/* Vizyon - Misyon & Projeler */
.vision-mission-grid, .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.vm-card, .project-card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s ease;
}

.vm-card { text-align: center; }
.project-card { border-left: 4px solid var(--accent-blue); }

.vm-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 210, 255, 0.3);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--accent-blue);
    margin-bottom: 1.5rem;
}

.project-tag {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--accent-gold);
    letter-spacing: 1px;
    margin-bottom: 0.8rem;
}

/* Footer */
.footer {
    background: #070a12;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 4rem 2rem 1rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h3 { font-family: var(--font-heading); margin-bottom: 1rem; }
.footer-col h3 span, .footer-col h4 { color: var(--accent-blue); }
.footer-col h4 { font-family: var(--font-heading); margin-bottom: 1.2rem; }
.footer-col p { color: var(--text-secondary); font-size: 0.9rem; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.5rem; }
.footer-col ul a { color: var(--text-secondary); text-decoration: none; transition: 0.3s; }
.footer-col ul a:hover { color: #fff; }

.social-links { margin-top: 1rem; display: flex; gap: 1rem; }
.social-links a { color: #fff; font-size: 1.2rem; transition: 0.3s; }
.social-links a:hover { color: var(--accent-blue); }

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Mobil Uyumluluk & Pure CSS Menü Mantığı */
@media (max-width: 768px) {
    .menu-icon { display: block; }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #0b0f19;
        padding: 2rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    /* Checkbox işaretlendiğinde menüyü göster */
    .menu-checkbox:checked ~ .nav-links {
        display: flex;
    }

    .hero-content h1 { font-size: 2.2rem; }
    .hero-buttons { flex-direction: column; }
}