:root{
    --paper:#F5F2E8;
    --grid:#D9DCC9;
    --ink:#1B2A4A;
    --ink-soft:#4B5975;
    --line:#C7CBB8;
    --card:#FCFBF5;
    --amber:#E8A33D;
    --amber-deep:#B97417;
    --teal:#2C7873;
    --brick:#B5432B;
    --lcd-bg:#12241f;
    --lcd-fg:#7FE0A3;
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:
      repeating-linear-gradient(0deg, var(--grid) 0 1px, transparent 1px 28px),
      repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 28px),
      var(--paper);
    color:var(--ink);
    font-family:'Inter',sans-serif;
    -webkit-font-smoothing:antialiased;
  }
  ::selection{background:var(--amber); color:var(--ink);}
  a{color:inherit;}

  .app{
    display:grid;
    grid-template-columns:300px 1fr;
    min-height:100vh;
  }

  /* ---------- SIDEBAR / BENCH ---------- */
  .bench{
    background:var(--ink);
    color:#EDE9DC;
    padding:28px 22px 22px;
    position:sticky; top:0; height:100vh; overflow-y:auto;
    border-right:3px solid var(--ink);
  }
  .brand{
    font-family:'Fraunces',serif;
    font-weight:900;
    font-size:1.5rem;
    line-height:1.05;
    letter-spacing:-0.01em;
  }
  .brand span{
    display:block;
    font-weight:500;
    font-style:italic;
    font-size:0.95rem;
    color:var(--amber);
    letter-spacing:0.04em;
    text-transform:uppercase;
  }
  .bench-tagline{
    margin-top:10px;
    font-family:'Fraunces',serif;
    font-style:italic;
    font-weight:500;
    font-size:0.92rem;
    color:var(--amber);
    letter-spacing:0.01em;
  }
  .bench-sub{
    margin-top:10px;
    font-size:0.78rem;
    color:#9FAAC4;
    border-bottom:1px solid #33415E;
    padding-bottom:16px;
  }
  .exp-list{
    margin-top:18px;
    display:flex;
    flex-direction:column;
    gap:6px;
  }
  .exp-item{
    display:flex; align-items:baseline; gap:10px;
    padding:10px 10px;
    border-radius:2px;
    cursor:pointer;
    border-left:3px solid transparent;
    transition:background 0.15s, border-color 0.15s;
    font-size:0.88rem;
  }
  .exp-item:hover{background:#233150;}
  .exp-item.active{background:#233150; border-left-color:var(--amber);}
  .exp-num{
    font-family:'IBM Plex Mono',monospace;
    font-size:0.72rem;
    color:var(--amber);
    flex-shrink:0;
    width:22px;
  }
  .exp-name{color:#EDE9DC; font-weight:500;}
  .exp-tag{display:block; font-size:0.7rem; color:#8B96AE; margin-top:2px;}

  .readout{
    margin-top:26px;
    border:1px solid #33415E;
  }
  .readout-label{
    font-family:'IBM Plex Mono',monospace;
    font-size:0.68rem;
    letter-spacing:0.08em;
    color:#8B96AE;
    padding:6px 10px;
    background:#182338;
    border-bottom:1px solid #33415E;
  }
  .readout-body{
    background:var(--lcd-bg);
    color:var(--lcd-fg);
    font-family:'IBM Plex Mono',monospace;
    font-size:0.8rem;
    line-height:1.7;
    padding:12px 10px;
    min-height:120px;
    white-space:pre-wrap;
    text-shadow:0 0 6px rgba(127,224,163,0.35);
  }
  .readout-body .dim{color:#3E7A56;}
  .readout-body .warn{color:#E8A33D; text-shadow:0 0 6px rgba(232,163,61,0.35);}

  /* ---------- MAIN LAB PANEL ---------- */
  .lab{padding:34px 44px 60px;}
  .protocol-bar{
    display:flex; flex-wrap:wrap; gap:10px;
    margin-bottom:28px;
  }
  .protocol-step{
    display:flex; align-items:center; gap:8px;
    background:var(--card);
    border:1px solid var(--line);
    padding:7px 13px;
    font-size:0.78rem;
    color:var(--ink-soft);
  }
  .protocol-step b{
    font-family:'IBM Plex Mono',monospace;
    color:var(--amber-deep);
  }
  .protocol-step.done{color:var(--teal); border-color:var(--teal);}

  h1.exp-title{
    font-family:'Fraunces',serif;
    font-weight:600;
    font-size:2rem;
    margin:0 0 4px;
    letter-spacing:-0.01em;
  }
  p.exp-desc{
    color:var(--ink-soft);
    max-width:680px;
    margin:0 0 28px;
    font-size:0.96rem;
  }

  .panel-grid{
    display:grid;
    grid-template-columns:340px 1fr;
    gap:26px;
    align-items:start;
  }
  @media (max-width:900px){
    .panel-grid{grid-template-columns:1fr;}
    .app{grid-template-columns:1fr;}
    .bench{position:relative; height:auto;}
  }

  .card{
    background:var(--card);
    border:1px solid var(--line);
    padding:22px;
  }
  .card h3{
    font-family:'Fraunces',serif;
    font-size:1.05rem;
    font-weight:600;
    margin:0 0 16px;
    padding-bottom:10px;
    border-bottom:1px dashed var(--line);
  }
  label{
    display:block;
    font-size:0.76rem;
    text-transform:uppercase;
    letter-spacing:0.05em;
    color:var(--ink-soft);
    margin-bottom:6px;
    margin-top:16px;
  }
  label:first-of-type{margin-top:0;}
  select, input[type=range]{
    width:100%;
  }
  select{
    padding:9px 10px;
    border:1px solid var(--line);
    background:#fff;
    font-family:'Inter',sans-serif;
    font-size:0.9rem;
    color:var(--ink);
  }
  input[type=range]{accent-color:var(--teal); margin-top:6px;}
  .dose-value{
    font-family:'IBM Plex Mono',monospace;
    font-size:0.95rem;
    color:var(--amber-deep);
    font-weight:600;
  }
  .row{display:flex; gap:10px; align-items:center; justify-content:space-between;}
  .toggle-row{display:flex; align-items:center; gap:8px; margin-top:16px;}
  .toggle-row input{accent-color:var(--teal);}
  .toggle-row label{margin:0; text-transform:none; letter-spacing:0; font-size:0.86rem; color:var(--ink);}

  button{
    font-family:'Inter',sans-serif;
    font-weight:600;
    font-size:0.85rem;
    border:none;
    padding:11px 16px;
    cursor:pointer;
    letter-spacing:0.01em;
  }
  .btn-primary{
    background:var(--ink); color:#EDE9DC;
    width:100%; margin-top:20px;
  }
  .btn-primary:hover{background:#233150;}
  .btn-ghost{
    background:transparent; color:var(--ink-soft);
    border:1px solid var(--line);
    width:100%; margin-top:8px;
  }
  .btn-ghost:hover{border-color:var(--ink-soft); color:var(--ink);}

  .chart-wrap{background:var(--card); border:1px solid var(--line); padding:20px;}
  .chart-canvas-box{position:relative; height:360px;}
  .analysis{
    margin-top:18px;
    padding:16px 18px;
    background:#FBF6E9;
    border-left:3px solid var(--amber-deep);
    font-size:0.87rem;
    color:var(--ink);
    line-height:1.6;
  }
  .analysis b{color:var(--amber-deep);}
  .pill{
    display:inline-block;
    font-family:'IBM Plex Mono',monospace;
    font-size:0.72rem;
    background:var(--teal); color:#fff;
    padding:2px 8px;
    margin-right:6px;
  }
  footer{
    margin-top:24px;
    font-size:0.75rem;
    color:var(--ink-soft);
    border-top:1px dashed var(--line);
    padding-top:14px;
  }

  /* ---------- FEEDBACK ---------- */
  .feedback-section{
    margin-top:48px;
    padding-top:30px;
    border-top:3px solid var(--ink);
    max-width:680px;
  }
  .feedback-section h3{
    font-family:'Fraunces',serif;
    font-weight:600;
    font-size:1.3rem;
    margin:0 0 6px;
  }
  .feedback-intro{
    color:var(--ink-soft);
    font-size:0.9rem;
    margin:0 0 20px;
  }
  .feedback-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
  }
  @media (max-width:600px){ .feedback-grid{grid-template-columns:1fr;} }
  #feedbackForm input[type=text], #feedbackForm textarea, #feedbackForm select{
    width:100%;
    padding:9px 10px;
    border:1px solid var(--line);
    background:#fff;
    font-family:'Inter',sans-serif;
    font-size:0.9rem;
    color:var(--ink);
  }
  #feedbackForm textarea{resize:vertical; margin-top:6px;}
  .star-row{
    display:flex; gap:6px; margin-top:6px; margin-bottom:4px;
  }
  .star{
    font-size:1.6rem;
    line-height:1;
    color:#D8D3C0;
    cursor:pointer;
    transition:color 0.15s, transform 0.1s;
    user-select:none;
  }
  .star:hover{ transform:scale(1.12); }
  .star.active{ color:var(--amber-deep); }
  .feedback-thanks{
    display:none;
    margin-top:18px;
    padding:14px 18px;
    background:#EAF3EF;
    border-left:3px solid var(--teal);
    color:var(--ink);
    font-size:0.88rem;
  }
  .feedback-thanks.show{ display:block; }

  /* ---------- TERMS / ACCEPTABLE USE GATE ---------- */
  .terms-overlay{
    position:fixed; inset:0;
    background:rgba(27,42,74,0.92);
    display:flex; align-items:center; justify-content:center;
    z-index:1000;
    padding:20px;
  }
  .terms-overlay.hidden{ display:none; }
  .terms-modal{
    background:var(--card);
    border:1px solid var(--line);
    max-width:560px;
    width:100%;
    max-height:88vh;
    overflow-y:auto;
    padding:30px 32px;
  }
  .terms-modal h2{
    font-family:'Fraunces',serif;
    font-weight:600;
    font-size:1.4rem;
    margin:0 0 4px;
  }
  .terms-modal .terms-sub{
    font-style:italic;
    color:var(--amber-deep);
    font-family:'Fraunces',serif;
    font-size:0.92rem;
    margin:0 0 18px;
  }
  .terms-modal ul{
    padding-left:20px;
    margin:0 0 18px;
    font-size:0.87rem;
    line-height:1.65;
    color:var(--ink);
  }
  .terms-modal ul li{margin-bottom:8px;}
  .terms-modal ul li b{color:var(--brick);}
  .terms-agree-row{
    display:flex; align-items:flex-start; gap:10px;
    background:#FBF6E9;
    border-left:3px solid var(--amber-deep);
    padding:12px 14px;
    margin-bottom:18px;
  }
  .terms-agree-row input{ margin-top:3px; accent-color:var(--teal); }
  .terms-agree-row label{ margin:0; text-transform:none; letter-spacing:0; font-size:0.85rem; color:var(--ink); }
  #termsEnter:disabled{ opacity:0.45; cursor:not-allowed; }
  .terms-footer-link{
    background:none; border:none; padding:0;
    color:var(--teal); text-decoration:underline;
    cursor:pointer; font-size:0.75rem; font-weight:600;
  }