body, html {
      margin: 0; padding: 0; height: 100%;
      background: var(--bg);
      overflow-x: hidden;
      position: relative;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }
    main.container {
      position: relative;
      z-index: 10;
      padding: 2rem 1rem 4rem;
      max-width: 900px;
      margin: 0 auto;
    }

    #particles {
      position: fixed;
      top: 0; left: 0;
      width: 100vw;
      height: 100vh;
      pointer-events: none;
      z-index: 1;
      background-color: var(--bg);
    }

    .timeline {
      margin: 2rem 0;
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
      padding-left: 40px;
    }
    .timeline::before {
      content: "";
      position: absolute;
      top: 0;
      left: 20px;
      width: 4px;
      height: 100%;
      background: var(--accent, #0b76ff);
      opacity: 0.3;
      border-radius: 2px;
      z-index: 0;
    }

    .update {
      display: flex;
      gap: 18px;
      align-items: flex-start;
      background: var(--card);
      padding: 18px 20px 18px 14px;
      border-radius: 12px;
      box-shadow: 0 6px 20px var(--shadow);
      position: relative;
      opacity: 0;
      transform: translateY(20px);
      animation: fadeSlideIn 0.8s forwards;
    }
    .update:nth-child(1) { animation-delay: 0.15s; }
    .update:nth-child(2) { animation-delay: 0.35s; }
    .update:nth-child(3) { animation-delay: 0.55s; }

    .update-mark {
      position: relative;
      width: 52px;
      height: 52px;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      background-color: var(--accent, #0b76ff);
      box-shadow: 0 0 10px var(--accent, #0b76ff);
      color: white;
      z-index: 5;
    }
    .update-mark svg {
      width: 30px;
      height: 30px;
      stroke-width: 2;
    }

    .update-mark.checked {
      background-color: var(--accent, #0b76ff);
    }
    .update-mark.upcoming-mark {
      background-color: #e3e9ff;
      color: var(--accent, #0b76ff);
      box-shadow: none;
    }

    .update-body h3 {
      margin: 0 0 6px 0;
      font-size: 1.25rem;
      color: var(--text);
    }
    .update-body p {
      margin: 0;
      color: var(--muted);
      font-size: 1rem;
      line-height: 1.4;
    }

    .muted {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--muted);
      margin-left: 6px;
    }

    .update.upcoming {
      opacity: 0.9;
      background: linear-gradient(180deg, #f0f5ff, #ffffff);
      box-shadow: none;
      color: #111;
    }

    .ethics-note {
      margin-top: 3rem;
      font-size: 0.9rem;
      color: var(--muted);
      text-align: center;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }

    @keyframes fadeSlideIn {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }