*, *::before, *::after {
    box-sizing: border-box;
  }
  body {
    margin: 0; padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f5f7; /* açık gri */
    color: #333333;
    line-height: 1.6;
  }

  a {
    color: #bfa33a; /* altın sarısı */
    text-decoration: none;
    transition: color 0.3s ease;
  }
  a:hover, a:focus {
    color: #e6c84a;
    outline: none;
  }

  /* Container */
  .container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
    padding: 20px 0;
  }

  /* Header */
  header {
    background-color: #2e2e2e; /* koyu gri */
    padding: 15px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 999;
  }
  nav.container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .logo {
    font-size: clamp(1.8rem, 3vw, 2.8rem);
    font-weight: 900;
    color: #bfa33a; /* altın */
    letter-spacing: 2px;
    user-select: none;
  }
  .nav-links {
    display: flex;
    gap: clamp(1rem, 1.5vw, 2rem);
    font-size: clamp(1rem, 1.5vw, 1.3rem);
  }
  .nav-links a {
    padding: 8px 12px;
    border-radius: 5px;
    font-weight: 600;
    color: #f4f5f7;
    background-color: transparent;
  }
  .nav-links a:hover,
  .nav-links a:focus {
    background-color: #bfa33a;
    color: #2e2e2e;
  }

  /* Hamburger menu */
  .hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    width: 28px;
    height: 22px;
    justify-content: space-between;
  }
  .hamburger span {
    height: 3px;
    background-color: #bfa33a;
    border-radius: 2px;
  }

  /* Hero */
  #hero {
    position: relative;
    background: linear-gradient(135deg, #3b3b3b 50%, #bfa33a 90%);
    color: #f4f5f7;
    padding: 140px 20px 100px 20px;
    overflow: hidden;
    text-align: center;
  }
  #hero::before {
    content: "VİZYON";
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: clamp(8rem, 20vw, 15rem);
    font-weight: 900;
    color: rgba(191,163,58,0.1);
    letter-spacing: 20px;
    user-select: none;
    pointer-events: none;
    z-index: 1;
    font-family: 'Segoe UI Black', 'Arial Black', sans-serif;
  }
  #hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: auto;
  }
  #hero h1 {
    font-size: clamp(2.8rem, 5vw, 4rem);
    margin-bottom: 15px;
    font-weight: 900;
    text-shadow: 0 2px 8px rgba(0,0,0,0.3);
  }
  #hero p {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 500;
    margin-bottom: 40px;
    text-shadow: 0 1px 5px rgba(0,0,0,0.25);
  }
  #scroll-about {
    font-size: clamp(1rem, 1.5vw, 1.3rem);
    background-color: #bfa33a;
    color: #2e2e2e;
    border: none;
    padding: 14px 30px;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 5px 10px rgba(191,163,58,0.6);
    transition: background-color 0.3s ease;
  }
  #scroll-about:hover,
  #scroll-about:focus {
    background-color: #e6c84a;
    outline: none;
  }

  /* Services */
  #services {
    background-color: #e8e8e8;
    padding: 90px 20px;
  }
  #services h2 {
    font-size: clamp( 2.5rem, 4vw, 3.5rem);
    text-align: center;
    color: #2e2e2e;
    margin-bottom: 25px;
    font-weight: 900;
    letter-spacing: 1.5px;
  }
  .services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
    gap: 30px;
    max-width: 1200px;
    margin: auto;
  }
  .service-card {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 6px 14px rgba(0,0,0,0.07);
    padding: 25px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .service-card:hover,
  .service-card:focus-within {
    transform: translateY(-8px);
    box-shadow: 0 12px 28px rgba(191,163,58,0.3);
    outline: none;
  }
  .service-icon {
    font-size: 4.5rem;
    margin-bottom: 18px;
    color: #bfa33a;
    user-select: none;
    text-align: center;
  }
  .service-card h3 {
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    margin-bottom: 10px;
    font-weight: 800;
    color: #2e2e2e;
  }
  .service-card p {
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    color: #555;
    text-align: center;
  }

  /* About */
  #about {
    background-color: #2e2e2e;
    color: #f4f5f7;
    padding: 80px 20px;
  }
  #about .container {
    max-width: 900px;
    margin: auto;
    text-align: center;
  }
  #about h2 {
    font-size: clamp(2.4rem, 4vw, 3.5rem);
    font-weight: 900;
    margin-bottom: 25px;
    letter-spacing: 1.5px;
  }
  #about p {
    font-size: clamp(1.1rem, 1.8vw, 1.4rem);
    line-height: 1.7;
    margin-bottom: 25px;
  }
  #founder {
    font-size: clamp(1rem, 1.5vw, 1.3rem);
    font-weight: 600;
    font-style: italic;
    color: #bfa33a;
  }

  /* References */
  #references {
    background-color: #f9f9f9;
    padding: 110px 20px;
  }
  #references h2 {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    text-align: center;
    color: #2e2e2e;
    margin-bottom: 50px;
    font-weight: 900;
  }
  .references-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
    max-width: 1200px;
    margin: auto;
  }
  .reference-item {
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 8px 18px rgba(0,0,0,0.08);
    max-width: 350px;
    flex: 1 1 300px;
    padding: 20px;
    text-align: center;
    transition: transform 0.3s ease;
  }
  .reference-item:hover,
  .reference-item:focus-within {
    transform: translateY(-10px);
    outline: none;
  }
  .reference-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 15px;
  }
  .reference-item p {
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    color: #444;
  }

  /* Contact */
  #contact {
    background-color: #2e2e2e;
    color: #f4f5f7;
    padding: 60px 20px;
  }
  #contact .container {
    max-width: 900px;
    margin: auto;
    text-align: center;
  }
  #contact h2 {
    font-size: clamp(2.4rem, 4vw, 3.5rem);
    font-weight: 900;
    margin-bottom: 30px;
  }
  .contact-info p {
    font-size: clamp(1rem, 1.5vw, 1.3rem);
    margin: 8px 0;
  }
  .contact-info a {
    color: #bfa33a;
    font-weight: 700;
  }

  /* Map */
  .map-container {
    margin-top: 30px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  }
  iframe {
    width: 100%;
    height: 350px;
    border: 0;
  }

  /* WhatsApp Button */
  #whatsapp-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: #25D366;
    color: white;
    border: none;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    font-size: 2.5rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s ease;
    z-index: 1000;
  }
  #whatsapp-btn:hover,
  #whatsapp-btn:focus {
    background-color: #128C50;
    outline: none;
  }

  /* Animations */
  .fade-in {
    animation: fadeInUp 1s ease forwards;
    opacity: 0;
    transform: translateY(20px);
  }
  @keyframes fadeInUp {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Responsive */
  @media (max-width: 768px) {
    .nav-links {
      display: none;
      flex-direction: column;
      background-color: #2e2e2e;
      position: fixed;
      top: 60px;
      right: 

0;
width: 200px;
height: calc(100vh - 60px);
padding: 20px;
gap: 20px;
z-index: 1000;
border-left: 1px solid #bfa33a;
}
.nav-links.show {
display: flex;
}
.hamburger {
display: flex;
}
}