/* --- Değişkenler ve Reset (Eco Tech Palette) --- */
:root {
    /* Renkler */
    --color-primary: #2ECC71;   /* Canlı Yeşil */
    --color-primary-dark: #27AE60;
    --color-dark: #2C3E50;      /* Teknik Koyu Gri (Lacivertimsi) */
    --color-light: #ECF0F1;     /* Açık Gri */
    --color-white: #FFFFFF;
    --color-text: #34495E;
    
    /* Fontlar */
    --font-heading: 'Exo 2', sans-serif; /* Teknolojik */
    --font-body: 'Inter', sans-serif;    /* Modern, Okunaklı */
    
    /* Ölçüler */
    --header-height: 80px;
    --container-width: 1200px;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-light);
    color: var(--color-text);
    line-height: 1.6;
    padding-top: var(--header-height); /* Header fixed olduğu için */
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* --- Header (Top Navigation - YENİ YAPI) --- */
.main-header {
    background-color: var(--color-white);
    height: var(--header-height);
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
}

.header-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-dark);
    display: flex;
    align-items: center;
}
.sun-icon { font-size: 1.5rem; margin-left: 5px; animation: spin 20s linear infinite; }
@keyframes spin { 100% { transform: rotate(360deg); } }

.navbar { display: flex; align-items: center; }

.nav-list { display: flex; gap: 30px; }
.nav-list a {
    font-weight: 500;
    color: var(--color-text);
    font-size: 1rem;
    position: relative;
}
.nav-list a:hover, .nav-list a.active { color: var(--color-primary); }
.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 0;
    width: 0; height: 2px;
    background-color: var(--color-primary);
    transition: 0.3s;
}
.nav-list a:hover::after, .nav-list a.active::after { width: 100%; }

.header-btn { margin-left: 20px; }
.mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; }
.mobile-menu-btn span { display: block; width: 25px; height: 3px; background-color: var(--color-dark); transition: 0.3s; }

/* Mobil Menü Overlay */
.mobile-menu-overlay {
    position: fixed; top: var(--header-height); left: 0; width: 100%; height: 0;
    background-color: var(--color-white);
    overflow: hidden;
    transition: 0.3s;
    z-index: 999;
    box-shadow: 0 5px 10px rgba(0,0,0,0.1);
}
.mobile-menu-overlay.active { height: auto; padding-bottom: 20px; border-bottom: 2px solid var(--color-primary); }
.mobile-menu-overlay ul { padding: 20px; text-align: center; }
.mobile-menu-overlay li { margin-bottom: 15px; }
.mobile-menu-overlay a { font-size: 1.2rem; font-weight: 600; color: var(--color-dark); }

/* --- Hero Section --- */
.hero {
    position: relative;
    height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-white);
    overflow: hidden;
}

.hero-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    z-index: -2;
    filter: brightness(0.8);
}
.hero-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to bottom, rgba(44, 62, 80, 0.6), rgba(44, 62, 80, 0.8));
    z-index: -1;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
}
.hero-content p { font-size: 1.3rem; margin-bottom: 40px; max-width: 700px; margin-left: auto; margin-right: auto; }
.hero-buttons { display: flex; gap: 20px; justify-content: center; }

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 15px 35px;
    font-weight: 600;
    border-radius: 50px; /* Yuvarlak butonlar */
    border: 2px solid transparent;
    cursor: pointer;
    transition: 0.3s;
    text-align: center;
}
.btn-green { background-color: var(--color-primary); color: var(--color-white); }
.btn-green:hover { background-color: var(--color-primary-dark); transform: translateY(-3px); box-shadow: 0 5px 15px rgba(46, 204, 113, 0.4); }
.btn-outline { background-color: transparent; border-color: var(--color-white); color: var(--color-white); }
.btn-outline:hover { background-color: var(--color-white); color: var(--color-dark); }
.full-width { width: 100%; border-radius: 8px; }

/* --- Sections & Typography --- */
.section { padding: 80px 0; }
.text-center { text-align: center; }
.section-title { margin-bottom: 60px; }
.section-title h2 { font-family: var(--font-heading); font-size: 2.5rem; color: var(--color-dark); margin-bottom: 15px; }
.section-title p { max-width: 600px; margin: 0 auto; color: #666; }

/* --- Grid & Cards --- */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }

.service-card {
    background: var(--color-white);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    transition: 0.3s;
    text-align: center;
    border-bottom: 4px solid transparent;
}
.service-card:hover { transform: translateY(-10px); border-bottom-color: var(--color-primary); }

.icon-box { font-size: 3rem; margin-bottom: 20px; }
.service-card h3 { margin-bottom: 15px; color: var(--color-dark); }

/* --- Stats Section --- */
.stats-section { background-color: var(--color-dark); color: var(--color-white); padding: 60px 0; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; text-align: center; }
.stat-item .number { display: block; font-size: 3rem; font-weight: 700; color: var(--color-primary); font-family: var(--font-heading); }
.stat-item .label { font-size: 1.1rem; opacity: 0.8; }

/* --- About Page --- */
.page-header { background-color: var(--color-dark); color: var(--color-white); padding: 100px 0 60px; text-align: center; }
.page-header h1 { font-family: var(--font-heading); font-size: 3rem; }

.split-layout { display: flex; gap: 50px; align-items: center; margin-bottom: 80px; }
.split-layout .text-content { flex: 1; }
.split-layout .image-content { flex: 1; }
.split-layout img { border-radius: 12px; box-shadow: 0 20px 40px rgba(0,0,0,0.1); }

.bg-tech { background-color: #E8F5E9; padding: 80px 0; }
.tech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin-top: 40px; }
.tech-item { background: var(--color-white); padding: 30px; border-radius: 8px; border-left: 5px solid var(--color-primary); }
.tech-item h3 { color: var(--color-dark); margin-bottom: 10px; }

/* --- Testimonials --- */
.testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 30px; }
.testimonial-card { background: var(--color-white); padding: 30px; border-radius: 12px; position: relative; box-shadow: 0 5px 15px rgba(0,0,0,0.05); }
.testimonial-card .quote { font-size: 4rem; color: var(--color-primary); opacity: 0.2; position: absolute; top: 10px; left: 20px; line-height: 1; font-family: serif; }
.testimonial-card p { position: relative; z-index: 1; font-style: italic; color: #555; margin-bottom: 20px; }
.testimonial-card .author strong { display: block; color: var(--color-dark); }
.testimonial-card .author span { font-size: 0.9rem; color: #888; }

/* --- Contact --- */
.contact-wrapper { display: grid; grid-template-columns: 1fr 2fr; gap: 60px; }
.contact-info { background: var(--color-dark); color: var(--color-white); padding: 40px; border-radius: 12px; height: fit-content; }
.contact-info h2 { color: var(--color-white); margin-bottom: 20px; }
.contact-info p { margin-bottom: 30px; opacity: 0.9; }
.contact-info h3 { color: var(--color-primary); margin-bottom: 10px; }
.contact-info a { color: var(--color-white); font-weight: bold; }

.contact-form-container { background: var(--color-white); padding: 40px; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.1); }
.form-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--color-dark); }
input, select, textarea { width: 100%; padding: 15px; border: 1px solid #ddd; border-radius: 8px; font-family: inherit; font-size: 1rem; transition: 0.3s; }
input:focus, select:focus, textarea:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.2); }

/* --- Privacy --- */
.policy-container { max-width: 800px; margin: 0 auto; padding: 60px 20px; }

/* --- Footer --- */
.main-footer { background-color: var(--color-dark); color: var(--color-white); padding: 60px 0 20px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 40px; }
.footer-col h3 { color: var(--color-primary); margin-bottom: 20px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.9rem; color: #888; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .navbar, .header-btn { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero-content h1 { font-size: 2.5rem; }
    .hero-buttons { flex-direction: column; }
    .split-layout, .contact-wrapper { grid-template-columns: 1fr; flex-direction: column; }
    .contact-info { margin-bottom: 30px; }
}