:root {
        --primary-navy: #1b365d;
        --dark-navy: #0e2240;
        --accent-red: #e30613;
        --bg-slate: #f1f5f9;
        --bg-light: #f8fafc;
        --text-dark: #1e293b;
        --text-light: #f8fafc;
        --text-muted: #64748b;
        --border-color: #e2e8f0;
        --radius-sm: 8px;
        --radius-lg: 16px;
      }

      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
        font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      }

      html {
        scroll-behavior: smooth;
      }

      body {
        background-color: var(--bg-light);
        color: var(--text-dark);
        line-height: 1.6;
        overflow-x: hidden;
      }

      .container {
        max-width: 1140px;
        margin: 0 auto;
        padding: 0 20px;
        width: 100%;
      }

      .container-wide {
        max-width: 1320px;
        margin: 0 auto;
        padding: 0 20px;
        width: 100%;
      }

      /* YUKARI ÇIKMA BUTONU */
      .scroll-to-top-btn {
        position: fixed;
        bottom: 30px;
        right: 30px;
        width: 48px;
        height: 48px;
        background-color: var(--accent-red);
        color: #ffffff;
        border: none;
        border-radius: 50%;
        box-shadow: 0 8px 20px rgba(227, 6, 19, 0.3);
        cursor: pointer;
        z-index: 999;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.1rem;
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
      }

      .scroll-to-top-btn.show { opacity: 1; visibility: visible; }
      .scroll-to-top-btn:hover { background-color: var(--primary-navy); transform: translateY(-3px); }

      /* HEADER & MARKA KİMLİĞİ */
      header {
        padding: 25px 0 15px;
        text-align: center;
      }

      .logo-area img {
        max-height:85px;
        height: auto;
        width: auto;
      }

      .hero-title {
        color: var(--primary-navy);
        font-size: 1.3rem;
        font-weight: 800;
        letter-spacing: 2px;
        margin-top: 10px;
        text-transform: uppercase;
      }

      .hero-title::after {
        content: "";
        display: block;
        width: 60px;
        height: 3px;
        background: var(--accent-red);
        margin: 8px auto 0;
      }

      /* HERO SLIDER SECTION */
      .hero-slider-section {
        margin: 15px 0 35px;
      }

      .slider-container {
        position: relative;
        width: 100%;
        height: 550px;
        overflow: hidden;
        border-radius: var(--radius-lg);
        box-shadow: 0 12px 35px rgba(27, 54, 93, 0.12);
        background-color: #0e2240;
        touch-action: pan-y;
      }

      .slider-track {
        display: flex;
        width: 100%;
        height: 100%;
        transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
        will-change: transform;
      }

      .slide {
        min-width: 100%;
        width: 100%;
        height: 100%;
        position: relative;
        text-decoration: none;
        color: inherit;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
        flex-shrink: 0;
      }

      .slide img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        object-position: center;
        transition: transform 0.7s ease;
      }

      .slide:hover img { transform: scale(1.02); }

      .slide-overlay {
        position: absolute;
        inset: 0;
        background: linear-gradient(to top, rgba(14, 34, 64, 0.95) 0%, rgba(14, 34, 64, 0.4) 30%, transparent 100%);
        padding: 45px 50px;
        color: #ffffff;
        display: flex;
        flex-direction: column;
        justify-content: flex-end;
      }

      .slide-no-overlay {
        background: none !important;
      }

      .slide-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background-color: var(--accent-red);
        color: #ffffff;
        font-size: 0.72rem;
        font-weight: 800;
        padding: 6px 16px;
        text-transform: uppercase;
        width: fit-content;
        margin-bottom: 12px;
        letter-spacing: 1px;
      }

      .slide-title {
        font-size: 2rem;
        font-weight: 900;
        margin-bottom: 8px;
        text-transform: uppercase;
        line-height: 1.2;
      }

      .slide-desc {
        font-size: 0.95rem;
        color: #cbd5e1;
        display: flex;
        align-items: center;
        gap: 8px;
        font-weight: 500;
      }

      .slider-btn {
        position: absolute;
        top: 50%;
        transform: translateY(-50%);
        width: 48px;
        height: 48px;
        background-color: rgba(255, 255, 255, 0.9);
        color: var(--primary-navy);
        border: none;
        border-radius: 50%;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.1rem;
        z-index: 10;
        transition: all 0.3s ease;
        user-select: none;
      }

      .slider-btn:hover { background-color: var(--accent-red); color: #ffffff; transform: translateY(-50%) scale(1.05); }
      .slider-btn.prev { left: 25px; }
      .slider-btn.next { right: 25px; }

      .slider-dots {
        position: absolute;
        bottom: 25px;
        right: 35px;
        display: flex;
        gap: 8px;
        z-index: 10;
      }

      .dot {
        width: 10px;
        height: 10px;
        border-radius: 50%;
        background-color: rgba(255, 255, 255, 0.4);
        cursor: pointer;
        transition: all 0.3s ease;
      }

      .dot.active { background-color: var(--accent-red); width: 28px; border-radius: 10px; }

      /* SABİT GEZİNTİ MENÜSÜ */
      .nav-container-wrapper {
        position: sticky;
        top: 0;
        z-index: 100;
        background: rgba(27, 54, 93, 0.96);
        backdrop-filter: blur(10px);
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
      }

      .main-nav {
        display: flex;
        justify-content: space-between;
        gap: 2px;
        flex-wrap: wrap;
      }

      .nav-link {
        color: #ffffff;
        padding: 16px 10px;
        text-decoration: none;
        font-weight: 700;
        font-size: 0.82rem;
        transition: all 0.25s ease;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        flex: 1;
        text-align: center;
        border-bottom: 3px solid transparent;
      }

      .nav-link i { font-size: 0.95rem; color: #fca5a5; }

      .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.08);
        border-bottom-color: var(--accent-red);
      }

      /* BÖLÜM ŞERİTLERİ */
      .page-section-wrapper {
        width: 100%;
        padding: 70px 0;
        scroll-margin-top: 50px;
      }

      .band-dark-navy {
        background-color: var(--dark-navy);
        background-image: linear-gradient(135deg, #0e2240 0%, #1b365d 100%);
        color: #ffffff;
      }

      .band-dark-navy .section-tag { color: #fca5a5; }
      .band-dark-navy .section-title { color: #ffffff; }
      .band-dark-navy .section-lead-text { color: #94a3b8; }
      .band-dark-navy .content-card { background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.1); }
      .band-dark-navy .content-card h4 { color: #ffffff; }
      .band-dark-navy .content-card p { color: #cbd5e1; }
      .band-dark-navy .content-list li { color: #e2e8f0; }

      .band-slate {
        background-color: var(--bg-slate);
        color: var(--text-dark);
      }

      .band-slate .content-card { background: #ffffff; border: 1px solid var(--border-color); }

      .band-white {
        background-color: #ffffff;
        color: var(--text-dark);
      }

      .band-white .content-card { background: var(--bg-slate); border: 1px solid transparent; }

      /* BÖLÜM BAŞLIKLARI VE KART DÜZENİ */
      .section-header-block {
        margin-bottom: 40px;
        text-align: center;
      }

      .section-tag {
        font-size: 0.75rem;
        font-weight: 800;
        color: var(--accent-red);
        text-transform: uppercase;
        letter-spacing: 2px;
        display: block;
        margin-bottom: 6px;
      }

      .section-title {
        font-size: 1.6rem;
        font-weight: 900;
        text-transform: uppercase;
        letter-spacing: -0.3px;
      }

      .section-lead-text {
        font-size: 0.95rem;
        margin: 10px auto 0;
        max-width: 800px;
      }

      
      .cards-grid-3 {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
      }

/* SEMPOZYUM İSTENDİĞİNDE KAPANACAK VE HRTML DE cards-grid-3 YAPILCAKrepeat(3 , 1fr)  yapılacak*/
      .cards-grid-22 {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
      }

      
      

      .content-card {
        border-radius: var(--radius-sm);
        padding: 28px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
      }

      .content-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 30px rgba(0,0,0,0.1);
      }

      .content-card-header {
        display: flex;
        align-items: center;
        gap: 14px;
        margin-bottom: 16px;
      }

      .card-icon-wrapper {
        width: 42px;
        height: 42px;
        border-radius: 50%;
        background-color: rgba(227, 6, 19, 0.12);
        color: var(--accent-red);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.15rem;
        flex-shrink: 0;
      }

      .content-card-header h4 {
        font-size: 0.98rem;
        font-weight:800;
        text-transform: uppercase;
      }

      .content-card p {
        font-size: 0.85rem;
        line-height: 1.6;
        margin-bottom: 15px;
      }

      .index-badge {
        font-size: 0.72rem;
        font-weight: 800;
        color: var(--primary-navy);
        margin-bottom: 8px;
        display: block;
        letter-spacing: 0.5px;
      }

      .kariyer-index-badge {
    color: #ede3e3;
}

      .content-list {
        list-style: none;
        margin: 10px 0 20px;
        padding: 0;
      }

      .content-list li {
        font-size: 0.83rem;
        margin-bottom: 8px;
        position: relative;
        padding-left: 20px;
      }

      .content-list li::before {
        content: "\f00c";
        font-family: "Font Awesome 6 Free";
        font-weight: 900;
        color: var(--accent-red);
        font-size: 0.72rem;
        position: absolute;
        left: 0;
        top: 2px;
      }

      .btn-apply {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 11px 22px;
        color: #ffffff;
        font-weight: 800;
        border-radius: var(--radius-sm);
        text-decoration: none;
        transition: all 0.3s ease;
        text-transform: uppercase;
        font-size: 0.78rem;
        letter-spacing: 0.5px;
        border: none;
        background-color: var(--primary-navy);
        margin-top: auto;
      }

      .btn-apply:hover {
        background-color: #ffffff;
        color: var(--primary-navy);
      }

      footer {
        text-align: center;
        padding: 30px 0;
        background-color: #fff;
        color: #94a3b8;
        font-size: 0.8rem;
      }

      /* SEMPOZYUM POPUP MODAL STİLLERİ */
      .modal-overlay {
        position: fixed;
        inset: 0;
        background: rgba(11, 26, 48, 0.8);
        backdrop-filter: blur(6px);
        z-index: 1000;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 20px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
      }

      .modal-overlay.active {
        opacity: 1;
        visibility: visible;
      }

      .popup-box {
        background: linear-gradient(145deg, #0e2240, #1b365d);
        border: 1px solid rgba(255, 255, 255, 0.15);
        border-radius: 16px;
        width: 100%;
        max-width: 520px;
        padding: 35px 30px;
        color: #ffffff;
        position: relative;
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        transform: scale(0.9) translateY(20px);
        transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        text-align: center;
      }

      .modal-overlay.active .popup-box {
        transform: scale(1) translateY(0);
      }

      .popup-close-btn {
        position: absolute;
        top: 15px;
        right: 15px;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.1);
        color: #ffffff;
        border: none;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.1rem;
        transition: all 0.3s ease;
      }

      .popup-close-btn:hover {
        background: var(--accent-red);
        transform: rotate(90deg);
      }

      .popup-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: rgba(227, 6, 19, 0.2);
        border: 1px solid var(--accent-red);
        color: #fca5a5;
        font-size: 0.7rem;
        font-weight: 800;
        padding: 5px 14px;
        border-radius: 20px;
        text-transform: uppercase;
        margin-bottom: 12px;
      }

      .popup-title {
        font-size: 1.35rem;
        font-weight: 900;
        line-height: 1.3;
        margin-bottom: 6px;
        text-transform: uppercase;
      }

      .popup-subtitle {
        font-size: 0.85rem;
        color: #cbd5e1;
        margin-bottom: 25px;
        font-style: italic;
      }

      .popup-timer-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 10px;
        margin-bottom: 25px;
      }

      .popup-time-card {
        background: rgba(255, 255, 255, 0.06);
        border: 1px solid rgba(255, 255, 255, 0.12);
        border-radius: 10px;
        padding: 12px 6px;
      }

      .popup-time-num {
        font-size: 1.6rem;
        font-weight: 900;
        color: #ffffff;
        line-height: 1;
      }

      .popup-time-text {
        font-size: 0.65rem;
        color: #94a3b8;
        text-transform: uppercase;
        font-weight: 700;
        margin-top: 5px;
      }

      .popup-btn-action {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: 100%;
        padding: 12px;
        background-color: var(--accent-red);
        color: #ffffff;
        text-decoration: none;
        font-weight: 800;
        border-radius: var(--radius-sm);
        text-transform: uppercase;
        font-size: 0.82rem;
        letter-spacing: 0.5px;
        transition: all 0.3s ease;
      }

      .popup-btn-action:hover {
        background-color: #ffffff;
        color: var(--primary-navy);
      }

      /* MOBİL VE RESPONSIVE DÜZENLEMELER */
      @media (max-width: 992px) {
        .cards-grid-3 { grid-template-columns: repeat(2, 1fr); }
        .slider-container { height: 420px; }
        .slide-title { font-size: 1.5rem; }
      }

      @media (max-width: 768px) {
        .slider-container { 
          height: auto; 
          min-height: 240px;
          aspect-ratio: 16 / 9;
        }

        .slide img {
          object-fit: contain;
          background-color: #0e2240;
        }

        .slide-overlay { padding: 15px 20px; }
        .slide-title { font-size: 1.1rem; margin-bottom: 4px; }
        .slide-desc { font-size: 0.75rem; }
        .slide-badge { font-size: 0.6rem; padding: 4px 10px; margin-bottom: 6px; }
        .slider-btn { width: 34px; height: 34px; font-size: 0.85rem; }
        .slider-btn.prev { left: 8px; }
        .slider-btn.next { right: 8px; }
        .slider-dots { bottom: 10px; right: 15px; }

        .main-nav {
          flex-direction: row;
          flex-wrap: wrap;
          justify-content: center;
          padding: 5px 0;
        }

        .nav-link {
          flex: 1 1 45%;
          padding: 10px 8px;
          font-size: 0.78rem;
          white-space: normal;
        }

        .page-section-wrapper { padding: 45px 0; }
        .cards-grid-3 { grid-template-columns: 1fr; }
        .cards-grid-22 { grid-template-columns: 1fr; }
        .hero-title { font-size: 1.1rem; }
        
        .popup-box { padding: 25px 20px; }
        .popup-time-num { font-size: 1.3rem; }
      }