/* =========================================
   MİSTEM Premium Kurumsal Stiller
   Açık (Light) Tema, Mavi Vurgulu
   ========================================= */

:root {
    /* Renk Paleti */
    --primary: #29448a; /* Logodaki derin kraliyet mavisi */
    --primary-light: #3e5da8;
    --primary-dark: #1b2e63;
    --accent: #e5edf7; /* Çok uçuk mavi, arkaplan vurguları için */
    --bg-color: #ffffff; /* Ana arkaplan */
    --bg-alt: #f8f9fc; /* İkincil açık gri/mavi arkaplan */
    --text-main: #1a1e29;
    --text-muted: #5a647d;
    --border-color: rgba(41, 68, 138, 0.1);
    
    /* Gölgeler & Efektler */
    --shadow-sm: 0 4px 12px rgba(41, 68, 138, 0.05);
    --shadow-md: 0 10px 30px rgba(41, 68, 138, 0.1);
    --shadow-hover: 0 15px 40px rgba(41, 68, 138, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    /* Fontlar */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Outfit', 'Inter', sans-serif; /* Başlıklar için alternatif modern font */
}

/* =========================================
   Reset & Temel Ayarlar
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    
    /* Teknoloji hissiyatı veren ızgara (grid) ve gradient arka plan */
    background-image: 
        radial-gradient(circle at 100% 0%, rgba(41, 68, 138, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 0% 100%, rgba(0, 180, 216, 0.06) 0%, transparent 40%),
        linear-gradient(rgba(41, 68, 138, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(41, 68, 138, 0.03) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 30px 30px, 30px 30px;
    background-position: 0 0, 0 0, -1px -1px, -1px -1px;
    background-attachment: fixed;
    
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    
    /* Özel İmleçleri Kaldırdık - Standart İşletim Sistemi İmleci (Ok/El) Kullanılacak */
}

/* Tüm Tıklanabilir Alanlar için */
a, button, select, input, textarea, .stem-highlight, .footer, .btn-primary, .bg-primary, .hero-glow {
    /* Özel bir imleç müdahalesi yok, tarayıcı varsayılan (pointer/text) kullanacak */
}

/* Yüzen Semboller Animasyonu */
.floating-symbol {
    position: absolute;
    z-index: 0;
    opacity: 0.15;
    color: var(--primary);
    animation: float 8s ease-in-out infinite;
    pointer-events: none;
}
@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(15deg); }
    100% { transform: translateY(0) rotate(0deg); }
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--primary);
    font-weight: 700;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}
.bg-alt {
    background-color: var(--bg-alt);
}

/* =========================================
   Tipografi ve Utility Sınıfları
   ========================================= */
.text-primary { color: var(--primary); }
.text-center { text-align: center; }

.section-title {
    font-size: 2.5rem;
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.title-line {
    width: 60px;
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
    margin: 16px 0 40px;
}
.title-line.center { margin-left: auto; margin-right: auto; }

.subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

/* =========================================
   Butonlar
   ========================================= */
.btn-primary, .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-light);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover {
    background-color: var(--primary);
    color: #ffffff;
    transform: translateY(-2px);
}

/* =========================================
   Header & Navigasyon (Glassmorphism)
   ========================================= */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
    padding: 20px 0;
}

.header.scrolled {
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 28px;
    font-weight: 900;
    color: var(--primary);
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 8px;
}
/* Uçak İkonu (Sembolik) */
.logo-icon {
    width: 24px;
    height: 24px;
    fill: var(--primary);
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.main-nav a:not(.btn-primary) {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 1rem;
}
.main-nav a:not(.btn-primary):hover {
    color: var(--primary);
}

/* Mobil Menü Butonu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}
.mobile-menu-btn span {
    width: 30px;
    height: 3px;
    background-color: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* =========================================
   Hero Bölümü
   ========================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: 80px; /* Header yüksekliği telafisi */
    background: transparent;
    overflow: hidden;
}

/* Hero Arkası Hareketli Parıltılar */
.hero-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 180, 216, 0.15) 0%, transparent 60%);
    border-radius: 50%;
    filter: blur(60px);
    z-index: 0;
    animation: pulseGlow 10s infinite alternate;
}
.hero-glow.left {
    top: 10%;
    left: -10%;
}
.hero-glow.right {
    bottom: -10%;
    right: -5%;
    background: radial-gradient(circle, rgba(41, 68, 138, 0.1) 0%, transparent 60%);
    animation-delay: 5s;
}

@keyframes pulseGlow {
    0% { transform: scale(1) translate(0, 0); opacity: 0.5; }
    50% { transform: scale(1.2) translate(50px, 50px); opacity: 1; }
    100% { transform: scale(1) translate(-20px, 20px); opacity: 0.5; }
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 24px;
    color: var(--text-main);
    line-height: 1.1;
    letter-spacing: -1px;
}
.hero-content h1 span {
    /* Gradient Yazı Efekti */
    background: linear-gradient(135deg, var(--primary), #00b4d8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}
.hero-content p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 500px;
}
.hero-actions {
    display: flex;
    gap: 16px;
}
.hero-actions .btn-primary {
    box-shadow: 0 10px 25px rgba(41, 68, 138, 0.4); /* Buton parlaması */
}
.hero-actions .btn-primary:hover {
    box-shadow: 0 15px 35px rgba(41, 68, 138, 0.6);
}

.hero-visual {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(41, 68, 138, 0.2); /* Daha belirgin gölge */
    transform: perspective(1000px) rotateY(-5deg);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.4); /* Cam efekti kenarlık */
}
.hero-visual:hover {
    transform: perspective(1000px) rotateY(0deg) translateY(-10px);
    box-shadow: 0 40px 80px rgba(0, 180, 216, 0.25);
}
.hero-visual img {
    width: 100%;
    height: auto;
    display: block;
}

/* Görsel Üzeri Yüzen Badge */
.floating-badge {
    position: absolute;
    bottom: 30px;
    left: -30px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 25px;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--primary);
    animation: floatBadge 6s ease-in-out infinite;
    border: 1px solid rgba(255,255,255,1);
    z-index: 10;
}
.badge-icon {
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #00b4d8;
}
@keyframes floatBadge {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* =========================================
   STEM Vurgu Köşesi (Özel Kutu)
   ========================================= */
.stem-highlight {
    background: var(--primary);
    color: white;
    padding: 60px 0;
    margin: -40px 0 40px;
    position: relative;
    z-index: 2;
    box-shadow: 0 20px 40px rgba(41, 68, 138, 0.2);
}
.stem-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}
.stem-item {
    padding: 20px;
}
.stem-letter {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-heading);
    margin-bottom: 10px;
    color: var(--bg-color);
    text-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.stem-word {
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 1px;
}

/* =========================================
   Hakkımızda & İçerik Grid
   ========================================= */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.about-image {
    width: 100%;
    height: 500px;
    background-size: cover;
    background-position: center;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}
.lead-text {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 20px;
}
.about-text p {
    margin-bottom: 20px;
    color: var(--text-muted);
}

/* =========================================
   Hizmetler / Kartlar
   ========================================= */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.service-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 4px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}
.service-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}
.service-card:hover::before {
    transform: scaleX(1);
}
.service-icon {
    width: 60px;
    height: 60px;
    background: var(--accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--primary);
}
.service-card h3 {
    margin-bottom: 16px;
    font-size: 1.3rem;
}
.service-card p {
    color: var(--text-muted);
}

/* =========================================
   İletişim & Form
   ========================================= */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}
.info-block {
    margin-bottom: 30px;
    padding: 24px;
    background: var(--bg-alt);
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}
.info-block h4 {
    margin-bottom: 8px;
    font-size: 1.1rem;
}
.info-block p {
    color: var(--text-muted);
}

.corporate-form {
    background: #ffffff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}
.form-group {
    margin-bottom: 24px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-alt);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 0 0 4px rgba(41, 68, 138, 0.1);
}

/* =========================================
   Footer
   ========================================= */
.footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.7);
    padding: 80px 0 20px;
}
.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 60px;
}
.footer-logo {
    font-size: 24px;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 16px;
}
.footer h4 {
    color: #ffffff;
    margin-bottom: 20px;
    font-size: 1.1rem;
}
.footer-links ul {
    list-style: none;
}
.footer-links li {
    margin-bottom: 12px;
}
.footer-links a:hover {
    color: #ffffff;
    padding-left: 4px;
}
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 0.9rem;
}

/* =========================================
   Animasyonlar (Scroll Effects)
   ========================================= */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   Responsive Tasarım
   ========================================= */
@media (max-width: 992px) {
    .hero-container, .about-grid, .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero { padding-top: 140px; padding-bottom: 60px; text-align: center; height: auto; min-height: auto; }
    .hero-content h1 { font-size: 3rem; }
    .hero-actions { justify-content: center; }
    .hero-content p { margin: 0 auto 30px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .stem-grid { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 70px 0; }
}

@media (max-width: 768px) {
    .hero-content h1 { font-size: 2.2rem; }
    .section-title { font-size: 1.8rem; }
    .lead-text { font-size: 1rem; }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 40px;
        transition: var(--transition);
        overflow-y: auto;
    }
    .main-nav.active { left: 0; }
    .main-nav ul {
        flex-direction: column;
        gap: 24px;
    }
    .mobile-menu-btn { display: flex; }
    
    .footer-container { grid-template-columns: 1fr; gap: 30px; text-align: center; }
    .services-grid { grid-template-columns: 1fr; gap: 20px; }
    
    .stem-grid { gap: 10px; }
    .stem-item { padding: 10px; }
    .stem-letter { font-size: 1.8rem; }
    .stem-word { font-size: 0.9rem; }
    
    .about-image { height: 300px; }
    .corporate-form { padding: 24px; }
    
    /* Rozet düzeltmesi */
    .floating-badge { bottom: -15px; left: 50%; transform: translateX(-50%); padding: 10px 15px; font-size: 0.85rem; width: max-content; }
    @keyframes floatBadge {
        0%, 100% { transform: translate(-50%, 0); }
        50% { transform: translate(-50%, -10px); }
    }
}

@media (max-width: 480px) {
    .stem-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; width: 100%; }
    .hero-actions a { width: 100%; text-align: center; }
}