.tech-hero {
    min-height: 80vh;
    background:
      linear-gradient(rgba(0,0,0,0.62), rgba(0,0,0,0.62)),
      url('/uploads/676d27e585bb78d01eb86247_article20120-20chlorella20.webp') center/cover no-repeat;
    color: var(--paper);
    padding: 160px var(--gutter) 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
  }
  .tech-hero::before {
    content:'';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(132,212,154,0.08), transparent 50%),
                      radial-gradient(circle at 80% 70%, rgba(132,212,154,0.05), transparent 50%);
  }
  .tech-hero-grid {
    max-width: var(--container);
    margin: 0 auto;
    width: 100%;
    position: relative;
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 80px;
    align-items: end;
  }
  .tech-hero h1 {
    font-size: clamp(56px, 9vw, 144px);
    font-weight: 300;
    letter-spacing: -0.045em;
    line-height: 0.92;
  }
  .tech-hero em { font-style: normal; color: var(--algae); }

  /* Process diagram */
  .process {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
  }
  .process-step {
    padding: 48px 32px;
    border-right: 1px solid var(--line);
    position: relative;
  }
  .process-step:last-child { border-right: none; }
  .process-step .num {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--leaf);
    letter-spacing: 0.12em;
    margin-bottom: 32px;
    display: block;
  }
  .process-step .icon {
    width: 56px; height: 56px;
    background: var(--mist);
    border-radius: 50%;
    margin-bottom: 24px;
    display: flex; align-items: center; justify-content: center;
    color: var(--leaf);
  }
  .process-step h4 {
    font-size: 20px; font-weight: 500; letter-spacing: -0.02em;
    margin-bottom: 12px;
  }
  .process-step p { font-size: 14px; color: var(--muted); line-height: 1.55; }
  @media (max-width: 880px) {
    .process { grid-template-columns: 1fr; }
    .process-step { border-right: none; border-bottom: 1px solid var(--line); }
    .tech-hero-grid { grid-template-columns: 1fr; gap: 40px; }
  }

  .algae-viz {
    aspect-ratio: 1/1;
    border-radius: var(--radius-lg);
    background: radial-gradient(circle at 30% 30%, #4a7c59, #1a4d2e);
    position: relative;
    overflow: hidden;
  }
  .algae-viz::before, .algae-viz::after {
    content:'';
    position: absolute;
    border-radius: 50%;
    background: var(--algae);
  }
  .algae-viz .cell {
    position: absolute;
    width: 8px; height: 8px;
    background: var(--algae-bright);
    border-radius: 50%;
    box-shadow: 0 0 20px var(--algae);
    animation: float 4s ease-in-out infinite;
  }
  @keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-10px) scale(1.1); }
  }