/* Kurumsal Modern Sıfırlamalar ve Değişkenler */
:root {
    --primary: #0078D7;
    --dark-blue: #001f3f; /* Simsoft Laciverti */
    --bg-light: #ffffff;
    --text-dark: #333333;
    --text-gray: #555555;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: padding 0.3s ease, background 0.3s ease;
}

.main-header.scrolled {
    padding: 10px 50px;
    background: rgba(255, 255, 255, 1);
}

.logo img {
    height: 60px;
    width: auto;
    object-fit: contain;
}

.main-nav .nav-list {
    display: flex;
    list-style: none;
    gap: 35px;
}

.main-nav .nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 16px;
    transition: color 0.3s ease;
    text-transform: uppercase;
}

.main-nav .nav-link:hover, .main-nav .nav-link.active {
    color: var(--primary);
}

/* Hero Section - Dikey Paneller */
.hero-panels {
    display: flex;
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero-title-overlay {
    position: absolute;
    top: 20%;
    left: 5%;
    z-index: 20;
    color: #fff;
    pointer-events: none;
}

.hero-title-overlay h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    text-shadow: 2px 2px 10px rgba(0,0,0,0.5);
}

.panel {
    flex: 1;
    background-size: cover;
    background-position: center;
    position: relative;
    transition: flex 0.7s cubic-bezier(0.25, 1, 0.5, 1);
    border-right: 2px solid #fff;
    overflow: hidden;
}

.panel:last-child {
    border-right: none;
}

.panel-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 31, 63, 0.75); /* Simsoft dark-blue overlay */
    transition: background-color 0.6s;
    z-index: 1;
}

.panel.active {
    flex: 4;
}

.panel.active .panel-overlay {
    background-color: transparent;
}

.panel-content {
    position: absolute;
    bottom: 40px;
    left: 20px;
    color: #fff;
    z-index: 5;
}

.panel-content h3 {
    font-size: 1.8rem;
    font-weight: 600;
    text-shadow: 1px 1px 5px rgba(0,0,0,0.8);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s 0.2s, transform 0.5s 0.2s;
}

.panel.active .panel-content h3 {
    opacity: 1;
    transform: translateY(0);
}

/* İstatistik Bandı */
.stats-band {
    background-color: var(--dark-blue);
    color: #fff;
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    text-align: center;
    gap: 40px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 15px;
    color: var(--bg-light);
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
    line-height: 1;
}

.stat-label {
    font-size: 1.1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Kurumsal / Hakkımızda Bölümü */
.about-section {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--dark-blue);
    font-weight: 700;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-gray);
    margin-bottom: 30px;
    line-height: 1.9;
}

.about-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    object-fit: cover;
}

/* Footer */
.main-footer {
    background-color: #0a0a0a;
    color: #cccccc;
    padding-top: 70px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 50px;
}

.footer-col h4 {
    font-size: 1.3rem;
    margin-bottom: 25px;
    color: #fff;
    font-weight: 600;
}

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

.footer-col ul li {
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.footer-col ul li a {
    color: #bbb;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.contact-info {
    color: #999;
    margin-top: 15px !important;
    font-size: 0.9rem !important;
}

.logo-col img {
    max-width: 180px;
    filter: brightness(0) invert(1);
}

.footer-bottom {
    background-color: #000000;
    padding: 20px 0;
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

/* Genel Butonlar */
.btn-primary {
    display: inline-block;
    padding: 14px 35px;
    background-color: var(--primary);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
    background-color: #00569b;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 120, 215, 0.4);
}

/* Fade-in Animasyonları */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
    .about-grid, .footer-grid, .stats-grid { grid-template-columns: 1fr; gap: 30px; }
    .hero-panels { flex-direction: column; padding-top: 80px;}
    .panel { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.2); }
    .main-header { flex-direction: column; padding: 15px; gap: 15px;}
    .hero-title-overlay h1 { font-size: 2.5rem; }
    .stat-item { padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
    .stat-item:last-child { border-bottom: none; }
}