:root {
    --turkuaz: #e74c3c; /* Ana kırmızı tonu */
    --beyaz: #fff;
    --acik-gri: #f7f7f7;
    --koyu-gri: #2c3e50;
    --gri: #e0e0e0;
    --shadow: 0 4px 16px rgba(231,76,60,0.07); /* Kırmızı gölge */
    --radius: 18px;
    --font: 'Poppins', Arial, Helvetica, sans-serif;
    --transition: all 0.2s cubic-bezier(.4,0,.2,1);
  }
  html {
    scroll-behavior: smooth;
  }
  body {
    font-family: var(--font);
    background: var(--acik-gri);
    color: var(--koyu-gri);
    margin: 0;
    padding: 0;
  }
  /* Header & Navbar */
  .navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--beyaz);
    padding: 0.7rem 2rem;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
  }
  .navbar .logo {
    display: flex;
    align-items: center;
  }
  .navbar .logo img {
    height: 54px;
    margin-right: 12px;
    border-radius: 10px;
    background: var(--beyaz);
    box-shadow: 0 2px 8px rgba(231,76,60,0.06);
  }
  .navbar .site-title {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--turkuaz);
    letter-spacing: 1px;
  }
  .navbar .nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
  }
  .navbar .nav-links a {
    color: var(--koyu-gri);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    padding: 6px 12px;
    border-radius: 8px;
    transition: var(--transition);
  }
  .navbar .nav-links a.active,
  .navbar .nav-links a:hover {
    background: var(--turkuaz);
    color: var(--beyaz);
  }
  .navbar .lang-switch {
    margin-left: 1.5rem;
    font-size: 1rem;
    color: var(--koyu-gri);
    background: var(--acik-gri);
    border-radius: 8px;
    padding: 4px 10px;
    cursor: pointer;
    border: none;
    font-family: var(--font);
    font-weight: 500;
    transition: var(--transition);
  }
  .navbar .lang-switch:focus {
    outline: 2px solid var(--turkuaz);
  }
  .navbar .hamburger {
    display: none;
    font-size: 1.7rem;
    color: var(--turkuaz);
    background: none;
    border: none;
    cursor: pointer;
    margin-left: 1rem;
  }
  /* Hero Section */
  .hero {
    position: relative;
    width: 100%;
    min-height: 420px;
    background: linear-gradient(120deg, #e74c3c 60%, #f7f7f7 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    text-align: center;
    padding: 3.5rem 1rem 2.5rem 1rem;
    overflow: hidden;
  }
  .hero .banner-img {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover;
    opacity: 0.18;
    z-index: 0;
    pointer-events: none;
  }
  .hero-content {
    position: relative;
    z-index: 2;
    max-width: 700px;
    margin: 0 auto;
  }
  .hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--koyu-gri);
    margin-bottom: 1rem;
    text-shadow: 0 2px 8px rgba(231,76,60,0.07);
  }
  .hero-subtitle {
    font-size: 1.3rem;
    color: var(--koyu-gri);
    margin-bottom: 2rem;
    font-weight: 500;
  }
  .hero .cta-btn {
    background: var(--turkuaz);
    color: var(--beyaz);
    font-size: 1.15rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    padding: 0.85rem 2.2rem;
    box-shadow: 0 2px 12px rgba(231,76,60,0.13);
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.5px;
  }
  .hero .cta-btn:hover, .hero .cta-btn:focus {
    background: #c0392b;
    outline: none;
  }
  /* Hakkımızda */
  .about-section {
    background: var(--beyaz);
    margin: 2.5rem auto 0 auto;
    max-width: 900px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.2rem 1.5rem 1.5rem 1.5rem;
    text-align: center;
  }
  .about-section p {
    font-size: 1.1rem;
    color: var(--koyu-gri);
    margin-bottom: 1.2rem;
  }
  .about-section .more-btn {
    background: var(--koyu-gri);
    color: var(--beyaz);
    border: none;
    border-radius: 10px;
    padding: 0.6rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
  }
  .about-section .more-btn:hover, .about-section .more-btn:focus {
    background: var(--turkuaz);
    color: var(--beyaz);
    outline: none;
  }
  /* Faaliyetlerimiz */
  .faaliyetler-section {
    margin: 3rem auto 0 auto;
    max-width: 1100px;
    padding: 0 1rem;
  }
  .faaliyetler-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--koyu-gri);
  }
  .faaliyetler-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
  }
  .faaliyet-card {
    background: var(--beyaz);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem 1.2rem;
    text-align: center;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 180px;
  }
  .faaliyet-card .fa {
    font-size: 2.2rem;
    color: var(--turkuaz);
    margin-bottom: 0.7rem;
  }
  .faaliyet-card .fa-stack {
    margin-bottom: 0.7rem;
  }
  .faaliyet-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: var(--koyu-gri);
  }
  .faaliyet-card p {
    font-size: 0.98rem;
    color: #555;
    margin: 0;
  }
  /* İstatistikler */
  .istatistikler-section {
    background: var(--turkuaz);
    color: var(--beyaz);
    margin: 3.5rem 0 0 0;
    padding: 2.5rem 0 2rem 0;
  }
  .istatistikler-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
    max-width: 1100px;
    margin: 0 auto;
  }
  .istatistik-card {
    background: rgba(255,255,255,0.13);
    border-radius: var(--radius);
    box-shadow: 0 2px 10px rgba(231,76,60,0.07);
    padding: 1.2rem 2.2rem;
    min-width: 180px;
    text-align: center;
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .istatistik-card .fa {
    font-size: 2.1rem;
    margin-bottom: 0.5rem;
    color: var(--beyaz);
    opacity: 0.85;
  }
  .istatistik-card .istatistik-sayi {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
  }
  .istatistik-card .istatistik-label {
    font-size: 1rem;
    font-weight: 500;
    opacity: 0.93;
  }
  /* Galeri */
  .galeri-section {
    margin: 3.5rem auto 0 auto;
    max-width: 1100px;
    padding: 0 1rem;
    text-align: center;
  }
  .galeri-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--koyu-gri);
  }
  .carousel {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 0 auto 1.2rem auto;
    overflow: hidden;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background: var(--beyaz);
  }
  .carousel-inner {
    display: flex;
    transition: transform 0.5s cubic-bezier(.4,0,.2,1);
    width: 100%;
  }
  .carousel-slide {
    min-width: 100%;
    box-sizing: border-box;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .carousel-slide img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    border-radius: var(--radius) var(--radius) 0 0;
  }
  .carousel-caption {
    padding: 1rem 1.2rem 1.2rem 1.2rem;
    font-size: 1.05rem;
    color: var(--koyu-gri);
    background: var(--beyaz);
    border-radius: 0 0 var(--radius) var(--radius);
    width: 100%;
    box-sizing: border-box;
  }
  .carousel-controls {
    position: absolute;
    top: 50%;
    left: 0; right: 0;
    display: flex;
    justify-content: space-between;
    width: 100%;
    transform: translateY(-50%);
    pointer-events: none;
  }
  .carousel-btn {
    background: rgba(231,76,60,0.13);
    border: none;
    color: var(--turkuaz);
    font-size: 2rem;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    cursor: pointer;
    pointer-events: all;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .carousel-btn:hover, .carousel-btn:focus {
    background: var(--turkuaz);
    color: var(--beyaz);
    outline: none;
  }
  /* Bağış & Gönüllü */
  .bagis-section {
    margin: 3.5rem auto 0 auto;
    max-width: 1100px;
    padding: 0 1rem;
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  .bagis-card {
    background: var(--beyaz);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    flex: 1 1 320px;
    min-width: 280px;
    max-width: 420px;
    padding: 2rem 1.5rem 1.5rem 1.5rem;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .bagis-card .fa {
    font-size: 2.2rem;
    color: var(--turkuaz);
    margin-bottom: 0.7rem;
  }
  .bagis-card h4 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--koyu-gri);
  }
  .bagis-card p {
    font-size: 1rem;
    color: #555;
    margin-bottom: 1.2rem;
  }
  .bagis-card .bagis-btn {
    background: var(--turkuaz);
    color: var(--beyaz);
    border: none;
    border-radius: 10px;
    padding: 0.7rem 1.7rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
  }
  .bagis-card .bagis-btn:hover, .bagis-card .bagis-btn:focus {
    background: var(--koyu-gri);
    color: var(--beyaz);
    outline: none;
  }
  /* İletişim */
  .iletisim-section {
    background: var(--beyaz);
    margin: 3.5rem auto 0 auto;
    max-width: 1100px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.2rem 1.5rem 2rem 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 2.5rem;
    justify-content: space-between;
  }
  .iletisim-info {
    flex: 1 1 320px;
    min-width: 260px;
    max-width: 400px;
    margin-bottom: 1.5rem;
  }
  .iletisim-info h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--koyu-gri);
  }
  .iletisim-info ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1.2rem 0;
  }
  .iletisim-info li {
    margin-bottom: 0.7rem;
    font-size: 1rem;
    color: #444;
    display: flex;
    align-items: center;
    gap: 0.7rem;
  }
  .iletisim-info a {
    color: var(--turkuaz);
    text-decoration: underline;
    font-size: 1rem;
  }
  .iletisim-form {
    flex: 1 1 320px;
    min-width: 260px;
    max-width: 420px;
    margin-bottom: 1.5rem;
  }
  .iletisim-form form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  .iletisim-form input,
  .iletisim-form textarea {
    border: 1.5px solid var(--gri);
    border-radius: 8px;
    padding: 0.7rem 1rem;
    font-size: 1rem;
    font-family: var(--font);
    background: var(--acik-gri);
    color: var(--koyu-gri);
    transition: border 0.2s;
    resize: none;
  }
  .iletisim-form input:focus,
  .iletisim-form textarea:focus {
    border-color: var(--turkuaz);
    outline: none;
  }
  .iletisim-form button {
    background: var(--turkuaz);
    color: var(--beyaz);
    border: none;
    border-radius: 8px;
    padding: 0.7rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-end;
  }
  .iletisim-form button:hover, .iletisim-form button:focus {
    background: var(--koyu-gri);
    color: var(--beyaz);
    outline: none;
  }
  /* Footer */
  footer {
    background: var(--koyu-gri);
    color: var(--beyaz);
    padding: 2rem 1rem 1rem 1rem;
    margin-top: 3rem;
    border-radius: var(--radius) var(--radius) 0 0;
    box-shadow: 0 -2px 12px rgba(231,76,60,0.07);
  }
  .footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
  }
  .footer-social {
    display: flex;
    gap: 1.2rem;
    align-items: center;
  }
  .footer-social a {
    color: var(--beyaz);
    font-size: 1.3rem;
    transition: color 0.2s;
    text-decoration: none;
  }
  .footer-social a:hover, .footer-social a:focus {
    color: var(--turkuaz);
    outline: none;
  }
  .footer-menu {
    display: flex;
    gap: 1.2rem;
    flex-wrap: wrap;
  }
  .footer-menu a {
    color: var(--beyaz);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.2s;
  }
  .footer-menu a:hover, .footer-menu a:focus {
    color: var(--turkuaz);
    outline: none;
  }
  .footer-copyright {
    text-align: center;
    margin-top: 1.2rem;
    font-size: 0.98rem;
    opacity: 0.85;
  }
  /* Yukarı Çık Butonu */
  #toTopBtn {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 999;
    background: var(--turkuaz);
    color: var(--beyaz);
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    font-size: 1.7rem;
    box-shadow: 0 2px 12px rgba(231,76,60,0.18);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }
  #toTopBtn:focus {
    outline: 2px solid var(--koyu-gri);
  }
  #toTopBtn.show {
    display: flex;
  }
  /* Erişilebilirlik */
  .accessibility-bar {
    position: fixed;
    left: 16px;
    bottom: 32px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
  }
  .accessibility-btn {
    background: var(--beyaz);
    color: var(--koyu-gri);
    border: 1.5px solid var(--turkuaz);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(231,76,60,0.07);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .accessibility-btn.active,
  .accessibility-btn:hover,
  .accessibility-btn:focus {
    background: var(--turkuaz);
    color: var(--beyaz);
    outline: none;
  }
  /* Düşük Görüş Modu */
  body.low-vision {
    background: #222 !important;
    color: #fff !important;
  }
  body.low-vision .navbar,
  body.low-vision .about-section,
  body.low-vision .faaliyet-card,
  body.low-vision .galeri-section,
  body.low-vision .bagis-card,
  body.low-vision .iletisim-section,
  body.low-vision .carousel,
  body.low-vision .istatistikler-section,
  body.low-vision footer {
    background: #222 !important;
    color: #fff !important;
    box-shadow: none !important;
  }
  body.low-vision .faaliyet-card,
  body.low-vision .bagis-card,
  body.low-vision .iletisim-section,
  body.low-vision .carousel,
  body.low-vision .about-section {
    border: 2px solid #fff !important;
  }
  body.low-vision .faaliyet-card .fa,
  body.low-vision .bagis-card .fa,
  body.low-vision .istatistik-card .fa {
    color: #fff !important;
  }
  body.low-vision .footer-menu a,
  body.low-vision .footer-social a {
    color: #fff !important;
  }
  body.low-vision .footer-menu a:hover,
  body.low-vision .footer-social a:hover {
    color: var(--turkuaz) !important;
  }
  body.low-vision .about-section .more-btn,
  body.low-vision .hero .cta-btn,
  body.low-vision .bagis-card .bagis-btn,
  body.low-vision .iletisim-form button {
    background: #fff !important;
    color: #222 !important;
  }
  /* Yüksek Kontrast */
  body.high-contrast {
    background: #000 !important;
    color: #fff !important;
  }
  body.high-contrast .navbar,
  body.high-contrast .about-section,
  body.high-contrast .faaliyet-card,
  body.high-contrast .galeri-section,
  body.high-contrast .bagis-card,
  body.high-contrast .iletisim-section,
  body.high-contrast .carousel,
  body.high-contrast .istatistikler-section,
  body.high-contrast footer {
    background: #000 !important;
    color: #fff !important;
    box-shadow: none !important;
  }
  body.high-contrast .faaliyet-card,
  body.high-contrast .bagis-card,
  body.high-contrast .iletisim-section,
  body.high-contrast .carousel,
  body.high-contrast .about-section {
    border: 2px solid #fff !important;
  }
  body.high-contrast .faaliyet-card .fa,
  body.high-contrast .bagis-card .fa,
  body.high-contrast .istatistik-card .fa {
    color: #fff !important;
  }
  body.high-contrast .footer-menu a,
  body.high-contrast .footer-social a {
    color: #fff !important;
  }
  body.high-contrast .footer-menu a:hover,
  body.high-contrast .footer-social a:hover {
    color: var(--turkuaz) !important;
  }
  body.high-contrast .about-section .more-btn,
  body.high-contrast .hero .cta-btn,
  body.high-contrast .bagis-card .bagis-btn,
  body.high-contrast .iletisim-form button {
    background: #fff !important;
    color: #000 !important;
  }
  /* Responsive */
  @media (max-width: 900px) {
    .faaliyetler-grid, .istatistikler-grid, .bagis-section, .iletisim-section, .footer-content {
      flex-direction: column;
      gap: 1.2rem;
      align-items: stretch;
    }
    .faaliyetler-grid {
      grid-template-columns: 1fr 1fr;
    }
    .istatistikler-grid {
      flex-direction: row;
      flex-wrap: wrap;
      gap: 1.2rem;
    }
    .bagis-section {
      flex-direction: column;
    }
    .iletisim-section {
      flex-direction: column;
    }
    .footer-content {
      flex-direction: column;
      align-items: center;
    }
  }
  @media (max-width: 600px) {
    .navbar {
      padding: 0.7rem 1rem;
    }
    .navbar .nav-links {
      position: fixed;
      top: 0;
      right: -100vw;
      width: 70vw;
      height: 100vh;
      background: var(--beyaz);
      flex-direction: column;
      align-items: flex-start;
      padding: 2.5rem 1.5rem;
      gap: 1.2rem;
      box-shadow: -2px 0 12px rgba(231,76,60,0.07);
      transition: right 0.3s cubic-bezier(.4,0,.2,1);
      z-index: 999;
    }
    .navbar .nav-links.open {
      right: 0;
    }
    .navbar .hamburger {
      display: block;
    }
    .hero-title {
      font-size: 1.5rem;
    }
    .hero-subtitle {
      font-size: 1rem;
    }
    .faaliyetler-grid {
      grid-template-columns: 1fr;
    }
    .carousel-slide img {
      height: 160px;
    }
    .istatistikler-grid {
      flex-direction: column;
      gap: 1.2rem;
    }
    .bagis-section {
      flex-direction: column;
      gap: 1.2rem;
    }
    .iletisim-section {
      flex-direction: column;
      gap: 1.2rem;
    }
    #toTopBtn, .accessibility-bar {
      right: 16px;
      left: auto;
      bottom: 16px;
    }
  }