a, button {
      color: inherit;
      font: inherit;
    }

    button {
      background: none;
      border: 0;
      cursor: pointer;
    }

    .timeline-section {
      width: 100%;
      padding: 4rem 0;
    }

    .section-title {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 3.5rem;
    }

    .section-title h1 {
      font-size: clamp(2.2rem, 4vw, 3.4rem);
      margin-bottom: 0.75rem;
      line-height: 1.08;
    }

    .section-title p {
      color: var(--gray);
      font-size: 1.05rem;
    }

    .timeline-wrap {
      position: relative;
      margin-bottom: 3rem;
      padding: 2rem 0 0;
    }

    .timeline-line {
      position: absolute;
      top: 3.2rem;
      left: 5%;
      right: 5%;
      height: 2px;
      background: linear-gradient(90deg, var(--border), var(--accent), var(--border));
      z-index: 0;
    }

    .timeline-nav {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: start;

    max-width: 1000px;
    margin: 0 auto;
    }

    .timeline-step {
      text-align: center;
      color: var(--gray);
      transition: color 0.25s ease, transform 0.25s ease;
    }

    .timeline-step:hover,
    .timeline-step.active {
      color: var(--primary);
      transform: translateY(-4px);
    }

    .timeline-dot {
      width: 18px;
      height: 18px;
      margin: 0 auto 1rem;
      border-radius: 50%;
      background: var(--white);
      border: 3px solid var(--accent);
      box-shadow: 0 0 0 8px rgba(255,255,255,0.96);
      transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
    }

    .timeline-step.active .timeline-dot,
    .timeline-step:hover .timeline-dot {
      background: var(--primary);
      border-color: var(--primary);
      transform: scale(1.08);
    }

    .timeline-number {
      display: inline-block;
      margin-bottom: 0.35rem;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      color: var(--accent);
    }

    .timeline-name {
      display: block;
      font-size: 1rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 0.25rem;
    }

    .timeline-label {
      display: block;
      font-size: 0.9rem;
      color: var(--gray);
      max-width: 225px;
      margin: 0 auto;
    }

    .timeline-preview {
      position: relative;
      min-height: 520px;
      border-radius: 28px;
      overflow: hidden;
      background: #102e24;
      box-shadow: var(--shadow-strong);
    }

    .timeline-panel {
      position: absolute;
      inset: 0;
      background-size: cover;
      background-position: center;
      opacity: 0;
      visibility: hidden;
      transform: scale(1.02);
      transition: opacity 0.45s ease, visibility 0.45s ease, transform 0.45s ease;
    }

    .timeline-panel::before {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(
        180deg,
        rgba(10,20,16,0.12) 0%,
        rgba(10,20,16,0.34) 44%,
        rgba(10,20,16,0.8) 100%
      );
    }

    .timeline-panel.active {
      opacity: 1;
      visibility: visible;
      transform: scale(1);
    }

    .timeline-overlay {
      position: absolute;
      left: 2rem;
      right: 2rem;
      bottom: 2rem;
      max-width: 560px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.45);
      border-radius: 18px;
      padding: 1.5rem;
      box-shadow: 0 16px 34px rgba(0,0,0,0.12);
    }

    .timeline-overlay h3 {
      margin-bottom: 0.45rem;
      font-size: 1.55rem;
      color: var(--dark);
    }

    .timeline-overlay p {
      color: var(--gray);
      margin: 0;
    }

    @media (max-width: 980px) {
      body {
        display: block;
      }

      .timeline-section {
        padding: 3rem 0;
      }

      .timeline-wrap {
        padding-top: 0;
      }

      .timeline-line {
        display: none;
      }

      .timeline-nav {
        grid-template-columns: 1fr;
        gap: 0.85rem;
      }

      .timeline-step {
        text-align: left;
        display: grid;
        grid-template-columns: 30px 1fr;
        gap: 0.85rem;
        align-items: start;
        padding: 1rem;
        border: 1px solid var(--border);
        border-radius: 16px;
        background: rgba(255,255,255,0.8);
        box-shadow: var(--shadow-soft);
      }

      .timeline-step:hover,
      .timeline-step.active {
        transform: none;
      }

      .timeline-dot {
        margin: 0.15rem 0 0;
        box-shadow: none;
      }

      .timeline-step-text {
        display: block;
      }

      .timeline-label {
        max-width: none;
        margin: 0;
      }

      .timeline-preview {
        min-height: 400px;
      }

      .timeline-overlay {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
        max-width: none;
      }
    }