:root { --ink:#101a2c; --muted:#667085; --paper:#f7f8fb; --line:#e4e8ef; --accent:#e66b49; --accent-dark:#b84d34; --navy:#17233b; --soft-blue:#eef3fa; --soft-peach:#fff1eb; }
* { box-sizing:border-box; }
html { min-width:320px; background:var(--paper); }
body { margin:0; background:var(--paper); color:var(--ink); font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; }
button,input { font:inherit; }
button { cursor:pointer; }
button:disabled { cursor:not-allowed; }
.site-shell { min-height:100vh; background:radial-gradient(circle at 8% 8%,#fff4ed 0,transparent 28rem),radial-gradient(circle at 95% 85%,#eaf2ff 0,transparent 32rem),var(--paper); }
.centered-shell { display:flex; align-items:center; justify-content:center; padding:42px 20px; }
.intro-card,.success-card { width:min(680px,100%); border:1px solid rgba(228,232,239,.9); border-radius:28px; background:rgba(255,255,255,.92); box-shadow:0 28px 80px rgba(16,26,44,.1); }
.intro-card { padding:clamp(28px,5vw,54px); }
.intro-topline,.study-header,.trial-footer,.practice-footer,.trial-heading,.rating-row { display:flex; align-items:center; justify-content:space-between; }
.intro-topline { gap:16px; }
.topline-label,.eyebrow,.section-kicker { color:var(--accent-dark); font-size:12px; font-weight:750; letter-spacing:.15em; text-transform:uppercase; }
.study-mark { display:inline-flex; align-items:flex-end; gap:3px; height:30px; width:32px; }
.mark-wave { display:block; width:7px; border-radius:8px; background:var(--accent); }
.mark-wave-one { height:13px; opacity:.55; }
.mark-wave-two { height:25px; }
.mark-wave-three { height:18px; opacity:.75; }
.intro-copy { margin-top:46px; max-width:590px; }
.intro-copy h1,.success-card h1,.practice-panel h1,.trial-heading h1 { margin:10px 0 0; color:var(--ink); font-size:clamp(31px,5vw,53px); line-height:1.05; letter-spacing:-.045em; }
.lead,.section-intro,.success-copy { margin:20px 0 0; color:var(--muted); font-size:17px; line-height:1.7; }
.study-details { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin:38px 0 30px; padding:18px 0; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.study-details div { display:grid; gap:5px; }
.study-details strong { font-size:22px; letter-spacing:-.03em; }
.study-details span { color:var(--muted); font-size:13px; }
.instruction-list { display:grid; gap:14px; }
.instruction-list>div { display:grid; grid-template-columns:36px 1fr; gap:10px; align-items:start; }
.instruction-list p { margin:0; color:#3c4657; font-size:15px; line-height:1.5; }
.instruction-index { color:var(--accent); font:700 12px/1.7 ui-monospace,SFMono-Regular,monospace; }
.consent-row { display:flex; gap:11px; align-items:flex-start; margin:32px 0 20px; color:#465164; font-size:14px; line-height:1.5; }
.consent-row input { width:18px; height:18px; margin-top:1px; accent-color:var(--accent); }
.privacy-note { margin:16px 0 0; color:#8a94a5; font-size:12px; text-align:center; }
.primary-button { display:inline-flex; justify-content:center; align-items:center; gap:14px; min-height:48px; padding:0 20px; border:0; border-radius:14px; background:var(--navy); color:#fff; font-weight:700; transition:transform .18s ease,background .18s ease,opacity .18s ease; }
.primary-button:hover:not(:disabled) { transform:translateY(-2px); background:#26385b; }
.primary-button:disabled { opacity:.35; }
.primary-button span { font-size:20px; line-height:1; }
.primary-button.wide { width:100%; }
.study-shell { padding:0 20px 72px; }
.study-header { width:min(980px,100%); margin:0 auto; padding:26px 0 18px; }
.brand-lockup { display:inline-flex; align-items:center; gap:11px; color:var(--ink); font-size:14px; font-weight:750; letter-spacing:-.02em; }
.practice-pill,.first-impression { padding:8px 11px; border-radius:999px; background:var(--soft-peach); color:var(--accent-dark); font-size:12px; font-weight:750; letter-spacing:.06em; }
.progress-meta { display:flex; gap:16px; align-items:center; color:var(--muted); font-size:13px; }
.progress-meta strong { color:var(--ink); font-size:15px; }
.progress-track { width:min(980px,100%); height:4px; margin:0 auto; overflow:hidden; border-radius:8px; background:#e5eaf2; }
.progress-track span { display:block; height:100%; border-radius:inherit; background:linear-gradient(90deg,var(--accent),#f1a76a); transition:width .35s ease; }
.practice-panel,.trial-panel { width:min(860px,100%); margin:48px auto 0; }
.practice-panel { padding-bottom:32px; }
.section-kicker { margin:0; }
.practice-panel h1,.trial-heading h1 { font-size:clamp(28px,4vw,42px); }
.section-intro { max-width:660px; font-size:16px; }
.video-frame { position:relative; overflow:hidden; margin-top:30px; border:1px solid #d9e0ea; border-radius:24px; background:#0d1525; box-shadow:0 22px 55px rgba(16,26,44,.16); }
.survey-video { display:block; width:100%; aspect-ratio:1/1; max-height:580px; object-fit:contain; background:#0d1525; }
.video-controls { display:flex; align-items:center; gap:16px; padding:15px 17px; background:#111c31; }
.play-button { display:inline-flex; align-items:center; justify-content:space-between; gap:10px; min-width:118px; padding:10px 14px; border:1px solid rgba(255,255,255,.16); border-radius:11px; background:rgba(255,255,255,.08); color:white; font-size:13px; font-weight:700; }
.play-button:disabled { opacity:.65; }
.play-glyph { color:#f0ad7d; font-size:16px; }
.video-note { color:#bac4d4; font-size:13px; line-height:1.45; }
.practice-footer { gap:16px; margin-top:22px; }
.ready-text { color:#27735c; font-size:14px; font-weight:700; }
.muted-text { color:var(--muted); font-size:14px; }
.trial-panel { margin-top:35px; }
.trial-heading { align-items:flex-end; gap:20px; }
.trial-heading h1 { margin-top:9px; }
.trial-panel .video-frame { margin-top:24px; }
.ratings-stack { display:grid; gap:14px; margin-top:24px; }
.rating-block { margin:0; padding:20px 22px 18px; border:1px solid var(--line); border-radius:18px; background:rgba(255,255,255,.78); }
.rating-block legend { padding:0; color:var(--ink); font-size:15px; font-weight:800; }
.rating-block p { margin:6px 0 15px; color:var(--muted); font-size:14px; }
.rating-row { align-items:center; gap:12px; }
.rating-end { width:78px; color:#8490a2; font-size:11px; line-height:1.25; }
.rating-end.right { text-align:right; }
.rating-options { display:flex; flex:1; justify-content:center; gap:clamp(7px,2.5vw,18px); }
.rating-option { display:grid; justify-items:center; gap:6px; color:#758095; font-size:13px; font-weight:700; }
.rating-option input { position:absolute; opacity:0; }
.rating-option span { display:grid; place-items:center; width:36px; height:36px; border:1px solid #d7deea; border-radius:50%; background:#fff; transition:all .15s ease; }
.rating-option:hover span { border-color:var(--accent); color:var(--accent-dark); }
.rating-option.selected span { border-color:var(--accent); background:var(--accent); color:#fff; box-shadow:0 0 0 4px rgba(230,107,73,.13); }
.trial-footer { margin-top:22px; }
.answered-status { color:var(--muted); font-size:13px; }
.success-card { padding:54px; text-align:center; }
.success-card .study-mark { margin:0 auto 34px; justify-content:center; }
.success-card h1 { font-size:clamp(36px,6vw,56px); }
.success-copy { max-width:440px; margin-right:auto; margin-left:auto; }
.success-stamp { display:inline-flex; margin:28px 0; padding:10px 14px; border-radius:999px; background:var(--soft-blue); color:#35557e; font-size:13px; font-weight:800; }
@media (max-width:620px) {
  .centered-shell { padding:18px 12px; }
  .intro-card,.success-card { border-radius:22px; padding:28px 22px; }
  .intro-copy { margin-top:34px; }
  .study-details strong { font-size:18px; }
  .study-shell { padding:0 12px 48px; }
  .study-header { padding-top:18px; }
  .topline-label { font-size:10px; }
  .trial-heading { display:block; }
  .first-impression { display:inline-block; margin-top:16px; }
  .rating-block { padding:17px 14px 15px; }
  .rating-row { gap:6px; }
  .rating-end { width:54px; font-size:10px; }
  .rating-options { gap:5px; }
  .rating-option span { width:32px; height:32px; }
  .video-controls { align-items:flex-start; flex-direction:column; gap:9px; }
  .practice-footer,.trial-footer { align-items:flex-start; flex-direction:column; }
  .trial-footer .primary-button,.practice-footer .primary-button { width:100%; }
  .progress-meta span { display:none; }
}