/*history.css*/
 * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
        background: linear-gradient(
          135deg,
          #1a1f3a 0%,
          #0f1528 50%,
          #1a1f3a 100%
        );
        color: #fff;
        min-height: 100vh;
        padding: 0;
      }

      .nav-container {
        padding: 2rem;
        display: flex;
        justify-content: center;
        animation: slideDown 0.6s ease-out;
      }

      @keyframes slideDown {
        from {
          transform: translateY(-100%);
          opacity: 0;
        }
        to {
          transform: translateY(0);
          opacity: 1;
        }
      }

      .nav {
        background: transparent;
        border: 2px solid rgba(255, 255, 255, 0.3);
        border-radius: 50px;
        padding: 0.5rem 1rem;
        display: flex;
        gap: 0;
        backdrop-filter: blur(10px);
      }

      .nav a {
        color: #fff;
        text-decoration: none;
        padding: 0.8rem 2.5rem;
        font-size: 0.95rem;
        text-transform: uppercase;
        letter-spacing: 1px;
        transition: all 0.3s ease;
        border-radius: 40px;
        position: relative;
      }


      .nav a.active {
        background: rgba(100, 181, 246, 0.2);
        color: #64b5f6;
      }

      .content-wrapper {
        padding: 2rem 2rem 4rem 2rem;
      }

      .container {
        max-width: 1400px;
        margin: 0 auto;
      }

      .section-title {
        text-align: center;
        font-size: 3rem;
        margin-bottom: 4rem;
        animation: fadeInDown 0.8s ease-out;
      }

      @keyframes fadeInDown {
        from {
          opacity: 0;
          transform: translateY(-30px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      .highlight {
        color: #64b5f6;
      }

      .timeline {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
        gap: 2rem;
        margin-top: 3rem;
      }

      .timeline-card {
        background: rgba(30, 40, 70, 0.6);
        backdrop-filter: blur(10px);
        border: 1px solid rgba(100, 181, 246, 0.2);
        border-radius: 20px;
        padding: 2.5rem;
        transition: all 0.4s ease;
        animation: fadeInUp 0.8s ease-out both;
        position: relative;
        overflow: hidden;
      }

      .timeline-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 3px;
        background: linear-gradient(90deg, #64b5f6, #42a5f5);
        transform: scaleX(0);
        transition: transform 0.4s ease;
      }

      .timeline-card:hover::before {
        transform: scaleX(1);
      }

      .timeline-card:nth-child(1) {
        animation-delay: 0.1s;
      }
      .timeline-card:nth-child(2) {
        animation-delay: 0.2s;
      }
      .timeline-card:nth-child(3) {
        animation-delay: 0.3s;
      }
      .timeline-card:nth-child(4) {
        animation-delay: 0.4s;
      }
      .timeline-card:nth-child(5) {
        animation-delay: 0.5s;
      }
      .timeline-card:nth-child(6) {
        animation-delay: 0.6s;
      }

      @keyframes fadeInUp {
        from {
          opacity: 0;
          transform: translateY(30px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      .timeline-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 50px rgba(100, 181, 246, 0.3);
        border-color: #64b5f6;
        background: rgba(30, 40, 70, 0.8);
      }

      .card-header {
        margin-bottom: 1.5rem;
      }

      .card-title {
        font-size: 1.6rem;
        margin-bottom: 0.8rem;
        color: #64b5f6;
        font-weight: 600;
      }

      .card-subtitle {
        color: #8899bb;
        text-transform: uppercase;
        font-size: 0.85rem;
        letter-spacing: 1.5px;
        font-weight: 500;
      }

      .card-content {
        line-height: 1.8;
        color: #c8d1e0;
        font-size: 1rem;
      }

      .particles {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        pointer-events: none;
        z-index: 0;
      }

      .particle {
        position: absolute;
        width: 2px;
        height: 2px;
        background: #64b5f6;
        border-radius: 50%;
        animation: particleFloat linear infinite;
        opacity: 0.6;
      }

      @keyframes particleFloat {
        0% {
          transform: translateY(0) translateX(0);
          opacity: 0;
        }
        10% {
          opacity: 0.6;
        }
        90% {
          opacity: 0.6;
        }
        100% {
          transform: translateY(-100vh) translateX(50px);
          opacity: 0;
        }
      }

      .container {
        position: relative;
        z-index: 1;
      }

      @media (max-width: 768px) {
        .section-title {
          font-size: 2rem;
        }

        .timeline {
          grid-template-columns: 1fr;
        }

        .content-wrapper {
          padding: 1rem;
        }

        .nav {
          flex-wrap: wrap;
          justify-content: center;
        }

        .nav a {
          padding: 0.6rem 1.5rem;
          font-size: 0.85rem;
        }
      }