.sd-how-it-works {
      padding: 60px 20px;
      text-align: center;
    }
    .sd-how-it-works h2 {
      font-size: 2.5rem;
      margin-bottom: 10px;
      color: #333;
    }
    .sd-how-it-works .sd-subtitle {
      font-size: 1.1rem;
      color: #666;
      margin-bottom: 20px;
    }
    .sd-how-it-works .sd-description {
      max-width: 800px;
      margin: 0 auto 50px;
      font-size: 1rem;
      color: #555;
      line-height: 1.6;
    }

    /* TIMELINE */
    .sd-timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
      max-width: 1100px;
      margin: auto;
      padding: 0 20px;
    }

    /* PROGRESS LINE */
    .sd-progress-line {
      position: absolute;
      top: 35px;
      left: 0;
      width: 0;
      height: 4px;
      background: #47080a;
      z-index: 0;
      transition: width 0.6s ease, height 0.6s ease;
      border-radius: 2px;
    }

    /* STEP */
    .sd-timeline-step {
      position: relative;
      text-align: center;
      width: 22%;
      z-index: 1;
    }

    /* CIRCLE */
    .sd-circle {
      width: 70px;
      height: 70px;
      background: #ccc;
      color: #fff;
      border-radius: 50%;
      line-height: 70px;
      font-size: 1.5rem;
      font-weight: bold;
      margin: 0 auto;
      transition: all 0.3s ease;
      opacity: 0;
      transform: scale(0.8);
    }
    .sd-circle.sd-active {
      background: #E31E24;
      box-shadow: 0 0 25px #ffa2a5;
      opacity: 1;
      transform: scale(1);
      transition: all 0.4s ease-out;
    }

    /* CARD */
    .sd-card {
      background: #fff;
      padding: 20px;
      border-radius: 12px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
      margin-top: 40px;
      opacity: 0;
      transform: translateY(20px) scale(0.95);
      transition: all 0.5s ease;
    }
    .sd-card img {
      width: 40px;
      margin-bottom: 10px;
    }
    .sd-card h3 {
      font-size: 1.2rem;
      margin-bottom: 10px;
      color: #222;
    }
    .sd-card p {
      font-size: 0.95rem;
      color: #555;
    }
    .sd-card.sd-active {
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    /* RESPONSIVE */
    @media (max-width: 768px) {
      .sd-timeline {
        flex-direction: column;
        align-items: center;
      }
      .sd-progress-line {
        left: 50%;
        top: 0;
        width: 4px;
        height: 0;
        transition: height 0.5s ease;
      }
      .sd-timeline-step {
        width: 100%;
        margin-bottom: 60px;
      }
      .sd-circle {
        margin-bottom: 20px;
      }
    }