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

    .mm {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .container {
      text-align: center;
    }

    .download-btn {
      position: relative;
      padding: 18px 50px;
      font-size: 18px;
      font-weight: 600;
      color: white;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      border: none;
      border-radius: 50px;
      cursor: pointer;
      overflow: hidden;
      transition: all 0.3s ease;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
      min-width: 200px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
    }

    .download-btn:hover:not(.downloading):not(.completed) {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
    }

    .download-btn.downloading {
      background: #4CAF50;
      cursor: not-allowed;
    }

    .download-btn.completed {
      background: #2196F3;
    }

    .btn-text {
      transition: opacity 0.3s ease;
    }

    .download-icon svg,
    .checkmark svg {
      width: 24px;
      height: 24px;
      fill: white;
    }

    .spinner {
      display: none;
      width: 24px;
      height: 24px;
      border: 3px solid rgba(255, 255, 255, 0.3);
      border-top: 3px solid white;
      border-radius: 50%;
      animation: spin 1s linear infinite;
    }

    .download-btn.downloading .spinner {
      display: block;
    }

    .download-btn.downloading .download-icon {
      display: none;
    }

    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    .progress-container {
      margin-top: 30px;
      width: 300px;
      height: 6px;
      background: rgba(255, 255, 255, 0.2);
      border-radius: 10px;
      overflow: hidden;
      opacity: 0;
      transition: opacity 0.3s ease;
      margin-left: auto;
      margin-right: auto;
    }

    .progress-container.active {
      opacity: 1;
    }

    .progress-bar {
      height: 100%;
      background: linear-gradient(90deg, #4CAF50, #8BC34A);
      border-radius: 10px;
      width: 0%;
      transition: width 0.3s ease;
      box-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
    }

    .progress-text {
      color: white;
      margin-top: 10px;
      font-size: 14px;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .progress-text.active {
      opacity: 1;
    }

    .checkmark {
      display: none;
      width: 24px;
      height: 24px;
    }

    .download-btn.completed .checkmark {
      display: block;
      animation: scaleIn 0.3s ease;
    }

    .download-btn.completed .spinner {
      display: none;
    }

    @keyframes scaleIn {
      0% { transform: scale(0); }
      50% { transform: scale(1.2); }
      100% { transform: scale(1); }
    }


       #certificates {
      padding: 60px 0;
    }

    #certificates h2 {
      text-align: center;
      font-size: 3.5rem;
      font-weight: 800;
      color: #fff;
      margin-bottom: 50px;
      text-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      animation: fadeInDown 1s ease-out;
    }

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

    .carousel-container {
      max-width: 1000px;
      margin: auto;
      padding: 40px;
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border-radius: 30px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
      animation: fadeInUp 1s ease-out 0.3s backwards;
    }

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

    .carousel-inner {
      max-width: 900px;
      margin: auto;
      height: 600px;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
      border: 6px solid transparent;
      background: linear-gradient(white, white) padding-box,
                  linear-gradient(135deg, #667eea, #764ba2, #f093fb, #667eea) border-box;
      animation: borderGlow 3s linear infinite;
    }

    @keyframes borderGlow {
      0%, 100% {
        filter: hue-rotate(0deg) brightness(1.2);
      }
      50% {
        filter: hue-rotate(30deg) brightness(1.5);
      }
    }

    .carousel-item {
      height: 600px;
      transition: transform 0.6s ease-in-out;
    }

    .carousel-item img {
      height: 100%;
      object-fit: contain;
      animation: zoomIn 0.6s ease-out;
    }

    @keyframes zoomIn {
      from {
        transform: scale(0.9);
        opacity: 0.5;
      }
      to {
        transform: scale(1);
        opacity: 1;
      }
    }

    .carousel-control-prev,
    .carousel-control-next {
      width: 80px;
      height: 80px;
      top: 50%;
      transform: translateY(-50%);
      opacity: 0.9;
      transition: all 0.3s ease;
    }

    .carousel-control-prev {
      left: -100px;
    }

    .carousel-control-next {
      right: -100px;
    }

    .carousel-control-prev:hover,
    .carousel-control-next:hover {
      opacity: 1;
      transform: translateY(-50%) scale(1.15);
    }

    .carousel-control-prev i,
    .carousel-control-next i {
      font-size: 4rem;
      color: #fff;
      text-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
      transition: all 0.3s ease;
      filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.8));
    }

    .carousel-control-prev:hover i,
    .carousel-control-next:hover i {
      color: #f093fb;
      filter: drop-shadow(0 0 20px rgba(240, 147, 251, 1));
      animation: pulse 0.6s ease-in-out;
    }

    @keyframes pulse {
      0%, 100% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.1);
      }
    }

    .carousel-indicators {
      bottom: -50px;
    }

    .carousel-indicators button {
      width: 15px;
      height: 15px;
      border-radius: 50%;
      margin: 0 8px;
      background-color: rgba(255, 255, 255, 0.5);
      border: 2px solid #fff;
      transition: all 0.3s ease;
    }

    .carousel-indicators button.active {
      background-color: #f093fb;
      transform: scale(1.3);
      box-shadow: 0 0 20px rgba(240, 147, 251, 0.8);
    }

    .carousel-indicators button:hover {
      background-color: #fff;
      transform: scale(1.2);
    }

    @media (max-width: 768px) {
      #certificates h2 {
        font-size: 2.5rem;
      }

      .carousel-inner {
        height: 400px;
      }

      .carousel-item {
        height: 400px;
      }

      .carousel-control-prev {
        left: -20px;
      }

      .carousel-control-next {
        right: -20px;
      }

      .carousel-control-prev i,
      .carousel-control-next i {
        font-size: 2.5rem;
      }
    }