:root{
    --pm-line: #e5e7eb;
    --pm-dot: #ffffff;
    --pm-dot-ring: #2563eb;
    --pm-card: #ffffff;
    --pm-card-border: #e5e7eb;
    --pm-muted: #475569;
    --pm-icon: #2563eb;
    --pm-shadow: 0 10px 20px rgba(2, 6, 23, 0.08);
  }

  .pm-timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0px 12px 24px 12px;
    font-family: Helvetica, Arial, sans-serif;
    color: #0f172a;
    background: transparent;
  }

  .pm-timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--pm-line);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
    border-radius: 999px;
  }

  .pm-item {
    padding: 10px 40px;
    position: relative;
    background-color: transparent;
    width: 50%;
  }

  .pm-item::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    right: -12px;
    background-color: var(--pm-dot);
    border: 4px solid var(--pm-dot-ring);
    top: 18px;
    border-radius: 999px;
    z-index: 1;
    box-shadow: 0 6px 14px rgba(2, 6, 23, 0.12);
  }

  .pm-left { left: 0; }
  .pm-right { left: 50%; }

  .pm-left::before,
  .pm-right::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 24px;
    width: 0;
    z-index: 1;
    border: medium solid transparent;
  }

  .pm-left::before {
    right: 30px;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent var(--pm-card);
    filter: drop-shadow(0 2px 2px rgba(2, 6, 23, 0.08));
  }

  .pm-right::before {
    left: 30px;
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--pm-card) transparent transparent;
    filter: drop-shadow(0 2px 2px rgba(2, 6, 23, 0.08));
  }

  .pm-right::after { left: -10px; }

  .pm-card {
    padding: 18px 18px;
    background-color: var(--pm-card);
    border: 1px solid var(--pm-card-border);
    border-radius: 14px;
    box-shadow: var(--pm-shadow);
  }

  .pm-title {
    margin: 0 0 8px 0;
    font-size: 16px;
    letter-spacing: 0.2px;
    display: flex;
    align-items: center;
    gap: 12px;
    line-height: 1.2;
  }

  .pm-icon {
    width: 32px;
    height: 32px;
    color: var(--pm-icon);
    flex: 0 0 auto;
  }

  .pm-text {
    margin: 0;
    font-size: 14px;
    color: var(--pm-muted);
    line-height: 1.45;
  }

  @media screen and (max-width: 600px) {
    .pm-timeline::after { left: 31px; }

    .pm-item {
      width: 100%;
      padding-left: 70px;
      padding-right: 18px;
      left: 0;
    }

    .pm-item::before {
      left: 60px;
      border: medium solid transparent;
      border-width: 10px 10px 10px 0;
      border-color: transparent var(--pm-card) transparent transparent;
    }

    .pm-item::after { left: 15px; }
  }