:root{--bg:#f5f6f8;--card:#fff;--text:#121417;--muted:#6b7280;--line:#e5e7eb;--accent:#111827;--danger:#b91c1c}
*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}a{color:inherit}.topbar{height:68px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:5}.version{font-size:12px;color:#fff;background:#111827;border-radius:999px;padding:5px 8px;margin-left:8px}.badge{font-size:12px;border:1px solid var(--line);border-radius:999px;padding:7px 10px;color:var(--muted)}.page{max-width:1400px;margin:0 auto;padding:24px}.landing{min-height:100vh;display:grid;place-items:center;padding:24px}.hero{max-width:760px;text-align:center;padding:56px}.hero h1{font-size:48px;margin:8px 0 12px}.eyebrow{font-weight:700;color:var(--muted);letter-spacing:.04em}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 1px 2px rgba(0,0,0,.03)}.btn{border:1px solid #d1d5db;background:#fff;border-radius:11px;padding:10px 14px;font-weight:650;cursor:pointer;text-decoration:none;display:inline-block}.btn:hover{background:#f9fafb}.btn.primary{background:#111827;color:#fff;border-color:#111827}.btn.small{padding:7px 10px}.btn.danger{color:var(--danger)}.hidden{display:none!important}.muted{color:var(--muted);font-size:14px}.alert{padding:12px 14px;border-radius:12px;background:#f3f4f6}.alert.danger{background:#fef2f2;color:#991b1b}.layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:20px}.sidebar{height:max-content;position:sticky;top:92px}.navbtn{display:block;width:100%;text-align:left;border:0;background:transparent;padding:12px;border-radius:10px;font-size:15px;cursor:pointer}.navbtn.active,.navbtn:hover{background:#f3f4f6;font-weight:700}.section-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px}.section-head h2{margin:0}.grid{display:grid;gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field label{font-weight:650;font-size:14px}.field input,.field textarea,.field select{width:100%;border:1px solid #d1d5db;border-radius:10px;padding:10px 11px;background:#fff;font:inherit}.field textarea{min-height:95px;resize:vertical}.instruction-editor{min-height:190px!important}.inline{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.spacer{height:10px}table{width:100%;border-collapse:collapse;background:#fff}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}th,td{text-align:left;padding:12px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}th{background:#fafafa;position:sticky;top:0}.status{padding:4px 8px;border-radius:999px;background:#f3f4f6;font-size:12px}.status.published{background:#ecfdf5}.status.archived{background:#fef2f2}.files{font-size:13px;color:var(--muted);line-height:1.7}.login{max-width:460px;margin:80px auto}.kpi .n{font-size:32px;font-weight:800}.kpi .l{color:var(--muted)}.choice-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;text-align:left;cursor:pointer;font:inherit}.choice-card:hover{border-color:#9ca3af;box-shadow:0 4px 16px rgba(0,0,0,.05)}.choice-card h3{font-size:22px;margin:0 0 8px}.timeline-head{margin-top:22px}.element-card{margin-bottom:14px;border-left:5px solid #d1d5db}.preset-element{border-left-color:#111827}.element-tag{font-size:11px;font-weight:800;letter-spacing:.08em;color:var(--muted)}.element-card h3{margin:5px 0 0}.element-tools{display:flex;gap:6px}.preset-settings{margin-top:18px}.checkline{display:flex;gap:8px;align-items:center;font-weight:650}.checkline input{width:auto}.runner-body{background:#fff}.runner-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.runner-card{width:min(780px,100%);background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px}.runner-card h2{font-size:28px}.instruction-text{font-size:18px;line-height:1.65;margin:18px 0 26px}.experiment-screen{position:fixed;inset:0;background:#fff}.stimulus-stage{position:absolute;inset:0;display:grid;place-items:center}.stimulus-stage img,.stimulus-stage video{max-width:90vw;max-height:78vh;object-fit:contain}.response-bar{position:absolute;left:0;right:0;bottom:22px;display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.response-bar button{padding:12px 18px;border:1px solid #d1d5db;border-radius:12px;background:#fff;font-weight:700}.fixation{width:6px;height:6px;background:#e00000;border-radius:50%}.pair-stage{display:grid;grid-template-columns:auto auto auto;align-items:center;gap:clamp(18px,3vw,42px)}.circle-stim{background:#000;border-radius:50%;flex:none}.fixedset-screen .response-bar{opacity:.18;transition:opacity .15s}.fixedset-screen .response-bar:hover{opacity:1}.countdown{font-size:48px;font-weight:800;letter-spacing:.04em;margin:22px 0}.calibration-wrap{height:220px;display:grid;place-items:center;border:1px dashed #d1d5db;border-radius:16px;margin:18px 0}.card-reference{height:62%;border:3px solid #111827;border-radius:14px;background:#f9fafb}.calibration-controls{justify-content:center}.calibration-controls input[type=range]{width:min(420px,70vw)}
@media(max-width:900px){.layout{grid-template-columns:1fr}.sidebar{position:static}.grid.two,.grid.three,.inline{grid-template-columns:1fr}.hero h1{font-size:36px}.runner-card{padding:22px}.response-bar{bottom:10px}.pair-stage{gap:14px}}
.pair-stage{position:absolute;inset:0}.left-circle,.right-circle{position:absolute;top:50%;transform:translateY(-50%)}.center-fixation{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%)}
.stimulus-library{margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}.stim-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.stim-card{border:1px solid var(--line);border-radius:14px;padding:10px;background:#fafafa}.stim-preview{width:100%;height:150px;object-fit:contain;background:#fff;border-radius:10px;border:1px solid var(--line)}.stim-meta{margin-top:8px}.stim-dims{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:8px 0}.stim-dims label{font-size:12px}.stim-dims input{width:100%;padding:7px;border:1px solid #d1d5db;border-radius:8px}.stim-file-icon{height:100px;display:grid;place-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;text-transform:uppercase}.uploaded-pair{display:flex;align-items:center;justify-content:center}.uploaded-pair>div{display:grid;place-items:center}.uploaded-pair img,.uploaded-pair video{object-fit:contain}
/* v6.2 universal calibrated visual builder */
.stim-preview-wrap{position:relative;width:100%;height:170px;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;display:grid;place-items:center}
.stim-preview-wrap .stim-preview{width:100%;height:100%;border:0;border-radius:0;object-fit:contain}
.ref-box{position:absolute;border:2px dashed #b91c1c;background:rgba(185,28,28,.05);pointer-events:none}
.stim-section{margin:10px 0;padding:10px;border:1px solid var(--line);border-radius:10px;background:#fff}
.muted-panel{opacity:.75}
.ref-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:8px 0}.ref-grid label{font-size:12px}.ref-grid input{width:100%;padding:7px;border:1px solid #d1d5db;border-radius:8px}
.field.compact{margin-top:8px;margin-bottom:8px}.field.compact select{padding:7px}
.fix-upload{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:4px 0 12px}
.scene-wrap{position:relative;display:grid;place-items:center}.scene-fixation{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;pointer-events:none}
.fixation-image{display:block;object-fit:contain}.isi-fixation{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center}
@media(max-width:700px){.ref-grid{grid-template-columns:repeat(2,1fr)}}
/* v7.2 public landing + account auth */

.public-page{
  max-width:1180px;
  margin:0 auto;
  padding:54px 24px 80px;
}

.public-hero{
  max-width:780px;
  padding:34px 0 58px;
}

.public-hero h1{
  font-size:clamp(42px,7vw,72px);
  line-height:1.02;
  margin:10px 0 18px;
  letter-spacing:-.04em;
}

.public-hero p{
  font-size:19px;
  color:var(--muted);
  max-width:620px;
}

.public-section-head{
  border-top:1px solid var(--line);
  padding-top:28px;
}

.experiment-public-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:16px;
}

.experiment-public-card{
  min-height:230px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  gap:24px;
}

.experiment-public-card h3{
  font-size:23px;
  margin:14px 0 8px;
}

.experiment-public-card p{
  color:var(--muted);
  line-height:1.55;
}

.public-empty{
  grid-column:1/-1;
}

.top-actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}

.modal-backdrop{
  position:fixed;
  inset:0;
  background:rgba(17,24,39,.48);
  display:grid;
  place-items:center;
  padding:20px;
  z-index:50;
}

.auth-modal{
  width:min(460px,100%);
  box-shadow:0 24px 70px rgba(0,0,0,.2);
}

.auth-tabs{
  display:flex;
  gap:8px;
  margin:4px 0 20px;
}

.auth-tabs .btn{
  flex:1;
}

.auth-modal #authSubmit{
  width:100%;
}

.auth-modal .alert{
  margin:8px 0 14px;
}

@media(max-width:700px){
  .public-topbar{
    height:auto;
    min-height:68px;
    padding:12px 16px;
  }

  .public-page{
    padding-top:30px;
  }

  .public-hero{
    padding-bottom:38px;
  }

  .public-hero h1{
    font-size:42px;
  }
}