:root{
    --bg: #FAF9F6;
    --bg-2: #F1EFEA;
    --panel: #0B121E;
    --panel-surface: #131E30;
    --panel-border: rgba(232,169,76,0.25);
    --ink: #10141A;
    --muted: #525C6A;
    --muted-dim: #88929D;
    --amber: #0278FF;
    --amber-light: #7eb5f5;
    --teal: hsl(214, 85%, 49%);
    --teal-light: #7f99e6;
    --paper: #F8F9F7;
    --line: rgba(16,20,26,0.08);
    --line-strong: rgba(16,20,26,0.16);
    --panel-line: rgba(241,243,240,0.08);
  }

  *{ box-sizing: border-box; }

  html,body{
    margin:0;
    padding:0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'Inter', sans-serif;
    -webkit-font-smoothing: antialiased;
  }

  .hero{
    position: relative;
    min-height: 100vh;
    overflow: hidden;
    background:
      radial-gradient(1200px 700px at 85% 10%, rgba(201,131,46,0.12), transparent 60%),
      radial-gradient(1000px 600px at 10% 90%, rgba(46,142,134,0.10), transparent 60%),
      linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
      padding-top: 100px;
  }

  .hero::before{
    content:"";
    position:absolute; inset:0;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(1300px 800px at 50% 25%, black, transparent 80%);
    opacity: 0.75;
    pointer-events:none;
  }

  /* ---------- NAV ---------- */
  nav{
    position: relative;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    display:flex;
    align-items:center;
    justify-content:space-between;
    max-width: 1320px;
    margin: 0 auto;
    padding: 28px 32px 0;
    padding: 28px 32px;
  }
  .wordmark{
    font-family:'Space Grotesk', sans-serif;
    font-weight:700;
    font-size: 20px;
    letter-spacing: -0.01em;
    display:flex;
    align-items:center;
    gap:12px;
    color: var(--ink);
    text-decoration: none;
  }
  .wordmark .mark{
    width: 28px; height: 28px;
    border-radius: 50%;
    border: 2px solid var(--amber);
    position:relative;
    flex-shrink:0;
    display:flex;
    align-items:center;
    justify-content:center;
  }
  .wordmark .mark::after{
    content:"";
    width: 10px; height: 10px;
    border-radius:50%;
    background: var(--amber);
    box-shadow: 0 0 10px var(--amber-light);
  }
  .navlinks{
    display:flex;
    align-items:center;
    gap: 36px;
    font-size: 14.5px;
    font-weight: 500;
  }
  .navlinks a{
    color: var(--muted);
    text-decoration:none;
    transition: color .2s ease;
  }
  .navlinks a:hover{ color: var(--ink); }
  .nav-cta{
    font-family:'IBM Plex Mono', monospace;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--paper);
    background: var(--ink);
    padding: 10px 22px;
    border-radius: 999px;
    border: 1px solid var(--ink);
    text-decoration:none;
    transition: all .25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 12px rgba(16,20,26,0.12);
  }
  .nav-cta:hover{
    background: var(--amber);
    border-color: var(--amber);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(201,131,46,0.3);
  }
  .navmenu{ display:flex; align-items:center; gap:36px; }
  .navlinks a:focus-visible, .nav-cta:focus-visible, .btn:focus-visible, .tab-btn:focus-visible{
    outline: 2px solid var(--teal);
    outline-offset: 3px;
    border-radius: 4px;
  }

  /* ---------- HERO GRID ---------- */
  .hero-inner{
    position: relative;
    z-index: 2;
    max-width: 1320px;
    margin: 0 auto;
    padding: 60px 32px 80px;
    display:grid;
    grid-template-columns: 1fr 1.08fr;
    gap: 52px;
    align-items:start;
  }

  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap: 10px;
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--amber);
    text-transform: uppercase;
    background: rgba(201,131,46,0.08);
    border: 1px solid rgba(201,131,46,0.2);
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 24px;
  }
  .eyebrow .dot{
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--amber);
    box-shadow: 0 0 6px var(--amber-light);
  }

  h1{
    font-family:'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: clamp(40px, 4.4vw, 58px);
    line-height: 1.08;
    letter-spacing: -0.02em;
    margin: 0 0 22px;
    color: var(--ink);
  }

  #rotate-word{
    display:inline-block;
    background: linear-gradient(90deg, var(--amber) 0%, var(--amber-light) 30%, var(--teal) 70%, var(--amber) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: gradient-pan 4s linear infinite;
    filter: drop-shadow(0 0 8px rgba(232,169,76,0.3));
  }

  .lede{
    font-size: 17.5px;
    line-height: 1.65;
    color: var(--muted);
    max-width: 52ch;
    margin: 0 0 34px;
  }

  @keyframes gradient-pan {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

  .cta-row{
    display:flex;
    align-items:center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 44px;
  }
  .btn{
    font-family:'Inter', sans-serif;
    font-weight: 600;
    font-size: 15px;
    padding: 15px 28px;
    border-radius: 10px;
    text-decoration:none;
    transition: all .25s ease;
    display:inline-flex;
    align-items:center;
    gap:10px;
  }
  .btn-primary{
    background: var(--ink);
    color: var(--paper);
    box-shadow: 0 4px 16px rgba(16,20,26,0.15);
  }
  .btn-primary:hover{
    background: #252e3d;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(16,20,26,0.25);
  }
  .btn-ghost{
    color: var(--ink);
    border: 1px solid var(--line-strong);
    background: rgba(255,255,255,0.6);
    backdrop-filter: blur(4px);
  }
  .btn-ghost:hover{
    border-color: var(--teal);
    color: var(--teal);
    background: #ffffff;
    transform: translateY(-2px);
  }

  .metrics-grid{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding-top: 28px;
    border-top: 1px solid var(--line-strong);
  }
  .metric-card{ display: flex; flex-direction: column; }
  .metric-num{ font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 22px; color: var(--ink); }
  .metric-label{ font-size: 12.5px; color: var(--muted); margin-top: 2px; font-weight: 500; }

  /* ---------- RIGHT PANEL ---------- */
  .panel-wrap{ position: relative; display:flex; flex-direction:column; gap:16px; }

  .iol-card{
    background: var(--panel);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 32px 80px -20px rgba(11,18,30,0.55);
    color: var(--paper);
    display: flex;
    flex-direction: column;
  }

  .card-header{
    padding: 20px 24px;
    background: rgba(255,255,255,0.03);
    border-bottom: 1px solid var(--panel-line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .card-title{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--amber-light);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .card-title::before{
    content:""; width:7px; height:7px; border-radius:50%; background: var(--amber-light);
    box-shadow: 0 0 8px var(--amber-light);
  }

  .iol-tabs{
    display: flex;
    gap: 6px;
    background: rgba(0,0,0,0.3);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.06);
    position: relative;
  }
  .tab-btn{
    background: transparent;
    border: none;
    color: var(--muted-dim);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11.5px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: all .2s ease;
  }
  .tab-btn.active{
    background: var(--teal);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(46,142,134,0.4);
  }

  .viewport{
    position: relative;
    height: 310px;
    background:
      radial-gradient(circle at 50% 50%, rgba(46,142,134,0.12) 0%, transparent 70%),
      radial-gradient(circle at 80% 20%, rgba(232,169,76,0.08) 0%, transparent 50%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  .tech-grid{
    position: absolute; inset:0;
    background-image:
      linear-gradient(var(--panel-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--panel-line) 1px, transparent 1px);
    background-size: 32px 32px;
    opacity: 0.6;
  }

  .iol-svg-container{
    position: relative;
    z-index: 3;
    width: 280px;
    height: 220px;
    filter: drop-shadow(0 12px 24px rgba(0,0,0,0.5));
    will-change: transform;
  }

  .optic-badge{
    position: absolute;
    z-index: 5;
    background: rgba(19,30,48,0.85);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(8px);
    padding: 6px 12px;
    border-radius: 6px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 11px;
    color: var(--paper);
    pointer-events: none;
    transition: all 0.3s ease;
  }
  .badge-optics{ top: 20px; left: 24px; }
  .badge-haptics{ bottom: 20px; right: 24px; }
  .optic-badge span{ color: var(--amber-light); font-weight: 600; }

  .info-body{
    padding: 24px;
    background: var(--panel-surface);
    border-top: 1px solid var(--panel-line);
  }

  .spec-grid{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    background: rgba(0,0,0,0.25);
    padding: 14px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 20px;
  }
  .spec-item{ display: flex; flex-direction: column; }
  .spec-lbl{ font-family: 'IBM Plex Mono', monospace; font-size: 10px; color: var(--muted-dim); text-transform: uppercase; letter-spacing: 0.05em; }
  .spec-val{ font-family: 'Space Grotesk', sans-serif; font-size: 14px; font-weight: 600; color: var(--paper); margin-top: 2px; }

  .feature-tags{ display: flex; flex-wrap: wrap; gap: 8px; }
  .tag{
    font-size: 12px;
    padding: 5px 12px;
    border-radius: 6px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    color: rgba(241,243,240,0.85);
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .tag::before{ content: "✓"; color: var(--teal-light); font-weight: bold; font-size: 11px; }

  /* ---------- SECONDARY: FOCUS CHART PANEL ---------- */
  .focus-card{
    background: var(--panel);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 20px 50px -22px rgba(11,18,30,0.5);
  }
  .focus-card-header{
    padding: 12px 18px;
    display:flex;
    align-items:center;
    justify-content: space-between;
    border-bottom: 1px solid var(--panel-line);
  }
  .focus-card-title{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted-dim);
  }
  .focus-card-hint{
    font-family: 'IBM Plex Mono', monospace;
    font-size: 10px;
    color: var(--amber-light);
    display:flex;
    align-items:center;
    gap:6px;
  }
  .focus-card-hint .dot{ width:5px; height:5px; border-radius:50%; background: var(--amber-light); }

  .focus-viewport{
    position: relative;
    height: 150px;
    cursor: none;
    background: radial-gradient(circle at 50% 50%, rgba(46,142,134,0.10) 0%, transparent 70%);
  }
  .fc-chart-layer{
    position:absolute; inset:0;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap: 5px;
    padding: 12px;
  }
  .fc-chart-row{ display:flex; gap: 10px; }
  .fc-chart-row span{
    font-family:'Space Grotesk', sans-serif;
    font-weight:700;
    color: var(--paper);
    line-height:1;
    display:inline-block;
  }
  .fc-blurred{ filter: blur(4px) grayscale(0.5); opacity: 0.35; }
  .fc-sharp{
    position:absolute; inset:0;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap: 5px;
    padding: 12px;
    clip-path: circle(1px at 50% 50%);
    transition: clip-path .05s linear;
  }
  .fc-sharp span{ color: var(--paper); text-shadow: 0 0 12px rgba(232,169,76,0.2); }
  .fc-lens-ring{
    position:absolute;
    width: 84px; height: 84px;
    left: 50%; top: 50%;
    margin-left: -42px; margin-top: -42px;
    border-radius: 50%;
    border: 1.5px solid var(--amber-light);
    box-shadow: 0 0 0 1px rgba(232,169,76,0.18), 0 0 26px 5px rgba(232,169,76,0.14), inset 0 0 18px rgba(232,169,76,0.10);
    pointer-events:none;
    z-index: 5;
    transition: left .05s linear, top .05s linear;
  }

  /* ---------- RESPONSIVE ---------- */
  @media (max-width: 1024px){
    .hero-inner{ grid-template-columns: 1fr; padding-top: 36px; gap: 48px; }
    .navmenu{ display:none; }
    h1{ max-width: none; }
  }

  @media (max-width: 540px){
    .metrics-grid{ grid-template-columns: 1fr; gap: 16px; }
    .spec-grid{ grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .card-header{ flex-direction: column; align-items: flex-start; gap: 10px; }
  }

  @media (prefers-reduced-motion: reduce){
    .fc-sharp, .fc-lens-ring{ transition: none; }
  }


 

  
    /* second section */

    .procedure *{ box-sizing: border-box; }

    .procedure{
      position: relative;
      background: linear-gradient(180deg, #F5F3ED 0%, #EBE8DF 100%);
      padding: 90px 24px 110px;
      overflow: hidden;
      font-family: 'Inter', sans-serif;
      color: var(--ink);
      -webkit-font-smoothing: antialiased;
    }
    .procedure::before{
      content:"";
      position:absolute; inset:0;
      background-image:
        linear-gradient(var(--line) 1px, transparent 1px),
        linear-gradient(90deg, var(--line) 1px, transparent 1px);
      background-size: 56px 56px;
      mask-image: radial-gradient(1300px 600px at 50% 10%, black, transparent 80%);
      opacity: 0.75;
      pointer-events:none;
    }

    .procedure-inner{ position:relative; z-index:1; max-width: 1280px; margin: 0 auto; }
    
    .procedure-head{ 
      text-align: center;
      max-width: 720px; 
      margin: 0 auto 50px; 
    }
    
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap: 10px;
      font-family:'IBM Plex Mono', monospace;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.12em;
      color: var(--amber);
      text-transform: uppercase;
      background: rgba(201,131,46,0.08);
      border: 1px solid rgba(201,131,46,0.2);
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 20px;
    }
    .eyebrow .dot{
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--amber);
      box-shadow: 0 0 6px var(--amber-light);
    }

    .procedure-head h2{
      font-family:'Space Grotesk', sans-serif;
      font-weight: 600;
      font-size: clamp(32px, 3.8vw, 48px);
      line-height: 1.12;
      letter-spacing: -0.02em;
      margin: 10px 0 16px;
      color: var(--ink);
    }
    
    .grad-word{
      display:inline-block;
      background: linear-gradient(90deg, var(--amber) 0%, var(--amber-light) 30%, var(--teal) 70%, var(--amber) 100%);
      background-size: 200% auto;
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
      color: transparent;
      animation: gradientShift 6s linear infinite;
    }
    @keyframes gradientShift{
      0%{ background-position: 0% 50%; }
      100%{ background-position: 200% 50%; }
    }

    .procedure-lede{ font-size: 16.5px; line-height: 1.65; color: var(--muted); margin:0; }

    /* Interactive Stage Selector Bar */
    .stage-nav{
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-bottom: 44px;
      flex-wrap: wrap;
    }
    
    .stage-tab-btn{
      display: flex;
      align-items: center;
      gap: 12px;
      background: rgba(255,255,255,0.7);
      border: 1px solid var(--line-strong);
      padding: 12px 24px;
      border-radius: 12px;
      font-family: 'Space Grotesk', sans-serif;
      font-size: 15px;
      font-weight: 600;
      color: var(--muted);
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      backdrop-filter: blur(8px);
    }
    
    .stage-tab-btn .tab-num{
      font-family: 'IBM Plex Mono', monospace;
      font-size: 11px;
      color: var(--muted-dim);
      background: rgba(0,0,0,0.05);
      padding: 3px 8px;
      border-radius: 6px;
      transition: all 0.25s ease;
    }

    .stage-tab-btn:hover{
      border-color: var(--teal);
      color: var(--ink);
      transform: translateY(-2px);
      background: #ffffff;
    }

    .stage-tab-btn.active{
      background: var(--panel);
      border-color: var(--amber-light);
      color: var(--paper);
      box-shadow: 0 12px 30px -10px rgba(11,18,30,0.4);
    }
    .stage-tab-btn.active .tab-num{
      background: var(--amber);
      color: #ffffff;
    }

    /* Main Interactive Stage Display Layout */
    .stage-display-container{
      display: grid;
      grid-template-columns: 1fr 1.15fr;
      gap: 36px;
      align-items: stretch;
    }

    /* Left Column: Clinical Description & Tech Specs */
    .stage-info-panel{
      background: rgba(255,255,255,0.85);
      border: 1px solid var(--line-strong);
      border-radius: 24px;
      padding: 36px;
      backdrop-filter: blur(12px);
      box-shadow: 0 20px 40px -15px rgba(0,0,0,0.05);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .stage-badge-tag{
      font-family: 'IBM Plex Mono', monospace;
      font-size: 11px;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--amber);
      font-weight: 600;
      margin-bottom: 12px;
      display: block;
    }

    .stage-info-panel h3{
      font-family: 'Space Grotesk', sans-serif;
      font-size: 30px;
      font-weight: 600;
      line-height: 1.15;
      margin: 0 0 14px;
      color: var(--ink);
    }

    .stage-description{
      font-size: 15px;
      line-height: 1.62;
      color: var(--muted);
      margin-bottom: 28px;
    }

    .clinical-metrics{
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-bottom: 28px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--line);
    }

    .metric-item{ display: flex; flex-direction: column; }

    .metric-val{
      font-family: 'Space Grotesk', sans-serif;
      font-weight: 700;
      font-size: 24px;
      color: var(--teal);
    }

    .metric-lbl{
      font-size: 12px;
      color: var(--muted);
      font-weight: 500;
      margin-top: 2px;
    }

    .feature-list{
      list-style: none;
      padding: 0;
      margin: 0;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .feature-list li{
      font-size: 13.5px;
      color: var(--ink);
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 500;
    }

    .feature-list li::before{
      content: "✓";
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: rgba(46,142,134,0.12);
      color: var(--teal);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 10.5px;
      font-weight: bold;
      flex-shrink: 0;
    }

    /* Right Column: Dynamic Visualizer Canvas */
    .stage-visualizer-panel{
      background: var(--panel);
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: 24px;
      overflow: hidden;
      position: relative;
      box-shadow: 0 28px 60px -18px rgba(11,18,30,0.6);
      display: flex;
      flex-direction: column;
      min-height: 420px;
    }

    .viz-header{
      padding: 16px 24px;
      background: rgba(255,255,255,0.03);
      border-bottom: 1px solid var(--panel-line);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .viz-title{
      font-family: 'IBM Plex Mono', monospace;
      font-size: 11px;
      letter-spacing: 0.1em;
      color: var(--amber-light);
      text-transform: uppercase;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .viz-title::before{
      content:""; width:7px; height:7px; border-radius:50%; background: var(--amber-light);
      box-shadow: 0 0 8px var(--amber-light);
    }

    .status-badge{
      font-family: 'IBM Plex Mono', monospace;
      font-size: 10.5px;
      color: var(--teal-light);
      background: rgba(46,142,134,0.15);
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid rgba(46,142,134,0.3);
    }

    .viz-viewport{
      flex: 1;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      background: 
        radial-gradient(circle at 50% 50%, rgba(46,142,134,0.1) 0%, transparent 70%),
        radial-gradient(circle at 80% 20%, rgba(232,169,76,0.06) 0%, transparent 50%);
      padding: 30px;
      overflow: hidden;
    }

    .tech-grid-bg{
      position: absolute; inset:0;
      background-image: 
        linear-gradient(var(--panel-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--panel-line) 1px, transparent 1px);
      background-size: 32px 32px;
      opacity: 0.5;
    }

    .stage-view-box{
      display: none;
      width: 100%;
      height: 100%;
      position: relative;
      z-index: 2;
      align-items: center;
      justify-content: center;
    }

    .stage-view-box.active-view{ display: flex; }

    /* Visualizer SVG Elements */
    .blade-svg-container{
      width: 320px;
      height: 220px;
      filter: drop-shadow(0 12px 24px rgba(0,0,0,0.5));
    }

    .visco-chamber{
      position: relative;
      width: 250px;
      height: 170px;
      border-radius: 120px 120px 20px 20px;
      border: 2px stroke rgba(255,255,255,0.15);
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(4px);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .visco-blob-dynamic{
      width: 130px;
      height: 85px;
      background: 
        radial-gradient(circle at 30% 30%, rgba(255,255,255,0.7), transparent 50%),
        linear-gradient(135deg, var(--teal-light), var(--teal));
      border-radius: 50% 50% 45% 55% / 60% 40% 60% 40%;
      box-shadow: 0 0 30px rgba(46,142,134,0.5);
      will-change: transform;
    }

    .iol-unfold-box{
      width: 280px;
      height: 220px;
      will-change: transform;
    }

    /* Controls Bar at Bottom of Visualizer */
    .viz-controls{
      padding: 18px 24px;
      background: var(--panel-surface);
      border-top: 1px solid var(--panel-line);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .control-group{
      display: flex;
      align-items: center;
      gap: 12px;
      flex: 1;
    }

    .control-label{
      font-family: 'IBM Plex Mono', monospace;
      font-size: 11px;
      color: var(--muted-dim);
      white-space: nowrap;
    }

    .slider-custom{
      flex: 1;
      height: 4px;
      appearance: none;
      background: rgba(255,255,255,0.15);
      border-radius: 2px;
      outline: none;
      cursor: pointer;
    }

    .slider-custom::-webkit-slider-thumb{
      appearance: none;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--amber-light);
      cursor: pointer;
      box-shadow: 0 0 10px var(--amber-light);
    }

    .readout-val{
      font-family: 'IBM Plex Mono', monospace;
      font-size: 12px;
      color: var(--paper);
      font-weight: 600;
      min-width: 70px;
      text-align: right;
    }

    /* Responsive */
    @media (max-width: 1024px){
      .stage-display-container{ grid-template-columns: 1fr; }
      .stage-info-panel{ padding: 28px; }
    }

    @media (max-width: 640px){
      .stage-nav{ flex-direction: column; align-items: stretch; }
      .stage-tab-btn{ justify-content: center; }
      .clinical-metrics{ grid-template-columns: 1fr; gap: 12px; }
      .viz-controls{ flex-direction: column; align-items: stretch; }
    }

    @media (prefers-reduced-motion: reduce){
      .grad-word, .visco-blob-dynamic{ animation: none !important; transition: none !important; }
    }