:root {
  --primary: #0273a5; /* Darkened for better contrast */
  --primary-dark: #0369a1;
  --secondary: #0ea5e9;
  --accent: #f59e0b; /* Amber/Orange for CTA */
  --accent-hover: #d97706;
  --bg-color: #f8fafc;
  --text-dark: #0f172a;
  --text-light: #64748b;
  --white: #ffffff;
  --radius: 8px;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1rem; color: var(--text-light); }

a {
  text-decoration: none;
  color: var(--primary);
  transition: color 0.3s ease;
}

a:hover { color: var(--primary-dark); }

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-accent {
  background-color: var(--accent);
  color: var(--text-dark);
  box-shadow: var(--shadow-sm);
}

.btn-accent:hover {
  background-color: var(--accent-hover);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-outline {
  background-color: transparent;
  color: var(--white);
  border: 2px solid var(--white);
}

.btn-outline:hover {
  background-color: var(--white);
  color: var(--primary);
}

/* Header & Navbar */
header {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.top-bar {
  background-color: var(--primary-dark);
  color: var(--white);
  padding: 0.5rem 0;
  font-size: 0.875rem;
}

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

.top-bar a {
  color: var(--white);
  margin-left: 1rem;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.logo span {
  color: var(--text-dark);
}

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

.nav-links a {
  color: var(--text-dark);
  font-weight: 600;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--primary);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-dark);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.7)), url('../images/blog/hero_kurumsal_1781194062416.webp') center/cover no-repeat;
  color: var(--white);
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero p {
  color: var(--white);
  font-size: 1.25rem;
  margin-bottom: 2rem;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Features Section */
.features {
  background-color: var(--white);
  margin-top: -50px;
  position: relative;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  z-index: 10;
}

.feature-card {
  text-align: center;
  padding: 1.5rem;
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.feature-card h2,
.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

/* About Section */
.about {
  display: flex;
  align-items: center;
  gap: 4rem;
}

.about-img {
  flex: 1;
  position: relative;
}

.about-img img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.about-content {
  flex: 1;
}

.section-subtitle {
  color: var(--primary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
  display: block;
}

.about-list {
  list-style: none;
  margin-bottom: 2rem;
}

.about-list li {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.about-list li i {
  color: var(--primary);
}

/* Services Section */
.services {
  background-color: var(--white);
}

.services-header {
  text-align: center;
  margin-bottom: 4rem;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.service-card {
  background-color: var(--bg-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid rgba(0,0,0,0.05);
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow);
}

.service-img {
  height: 200px;
  background-color: #e2e8f0;
  position: relative;
  overflow: hidden;
}

.service-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.service-card:hover .service-img img {
  transform: scale(1.1);
}

.service-content {
  padding: 1.5rem;
}

.service-content h3 {
  margin-bottom: 0.5rem;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  margin-top: 1rem;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  text-align: center;
  padding: 4rem 0;
}

.cta-section h2 {
  color: var(--white);
  margin-bottom: 1rem;
}

.cta-section p {
  color: rgba(255,255,255,0.9);
  max-width: 600px;
  margin: 0 auto 2rem auto;
}

/* Footer */
footer {
  background-color: var(--text-dark);
  color: var(--white);
  padding: 4rem 0 0 0;
}

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

.footer-col h3 {
  color: var(--white);
  margin-bottom: 1.5rem;
  position: relative;
  padding-bottom: 0.5rem;
  display: inline-block;
}

.footer-col h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
}

.footer-col p,
.footer-bottom p {
  color: #cbd5e1;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: #cbd5e1;
  transition: color 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-links a:hover {
  color: var(--primary);
  transform: translateX(5px);
}

.contact-info li {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  color: #cbd5e1;
}

.contact-info i {
  color: var(--primary);
  font-size: 1.25rem;
  margin-top: 0.25rem;
}

.footer-bottom {
  background-color: #020617;
  padding: 1.5rem 0;
  text-align: center;
  color: #cbd5e1; /* Daha parlak gri (Yüksek Kontrast) */
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 992px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
    margin-top: -20px;
  }
}

@media (max-width: 768px) {
  .top-bar {
    display: none;
  }
  
  .nav-links {
    display: none; /* Mobile menu hidden by default */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--white);
    flex-direction: column;
    padding: 1rem 0;
    box-shadow: var(--shadow);
    gap: 0;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .nav-links li {
    width: 100%;
    text-align: center;
  }
  
  .nav-links a {
    display: block;
    padding: 1rem;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero-btns {
    flex-direction: column;
  }
  
  .about {
    flex-direction: column;
  }
  
  .features {
    grid-template-columns: 1fr;
    margin-top: 2rem;
  }
}