:root{--bg:#f6faf9;--card:#fff;--ink:#17312d;--muted:#6b7d79;--line:#dfe9e6;--brand:#0f766e;--brand2:#14b8a6;--soft:#e9fbf7;--danger:#b42318;--warn:#9a6700;--shadow:0 10px 30px rgba(24,59,52,.08);--radius:20px}
*{box-sizing:border-box}html{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink)}body{margin:0;background:var(--bg)}a{color:var(--brand);text-decoration:none}button,input,select,textarea{font:inherit}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800}.brand small{display:block;color:var(--muted);font-weight:600;font-size:.72rem}.brand-mark{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow);font-size:.8rem;letter-spacing:.04em}.public-main{min-height:100vh;display:grid;place-items:center;padding:24px}.login-wrap{width:min(100%,430px)}.login-hero{text-align:center;margin-bottom:24px}.login-hero .brand{justify-content:center;font-size:1.2rem}.login-hero h1{font-size:2rem;margin:28px 0 8px}.login-hero p{color:var(--muted);margin:0}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.form-group{margin-bottom:18px}.form-group label{display:block;font-weight:700;margin-bottom:8px;font-size:.92rem}.input,.select,textarea{width:100%;border:1px solid #cfdcd8;background:#fff;border-radius:14px;padding:13px 14px;outline:none;transition:.18s}.input:focus,.select:focus,textarea:focus{border-color:var(--brand2);box-shadow:0 0 0 4px rgba(20,184,166,.12)}textarea{min-height:110px;resize:vertical}.btn{border:0;border-radius:14px;padding:12px 16px;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn-primary{background:linear-gradient(135deg,var(--brand),#0d9488);color:#fff;box-shadow:0 8px 20px rgba(15,118,110,.2)}.btn-secondary{background:#edf6f4;color:var(--brand)}.btn-ghost{background:#fff;border:1px solid var(--line);color:var(--ink)}.btn-danger{background:#feeceb;color:var(--danger)}.btn-sm{padding:8px 11px;border-radius:10px;font-size:.84rem}.btn-block{width:100%}.muted{color:var(--muted)}.small{font-size:.85rem}.flash{max-width:1100px;margin:16px auto;padding:13px 16px;border-radius:14px;border:1px solid}.flash-success{background:#ecfdf5;border-color:#a7f3d0;color:#166534}.flash-error{background:#fef2f2;border-color:#fecaca;color:#991b1b}.flash-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}.admin-shell{min-height:100vh}.admin-sidebar{position:fixed;left:0;top:0;bottom:0;width:250px;background:#fff;border-right:1px solid var(--line);padding:22px;display:flex;flex-direction:column;z-index:20}.admin-sidebar nav{display:grid;gap:7px;margin-top:28px}.admin-sidebar nav a{padding:12px 13px;border-radius:12px;color:#36504b;font-weight:700;display:flex;gap:10px}.admin-sidebar nav a:hover{background:var(--soft);color:var(--brand)}.sidebar-foot{margin-top:auto;border-top:1px solid var(--line);padding-top:18px;display:grid;gap:7px}.admin-main{margin-left:250px;padding:30px;min-height:100vh}.mobile-admin-top{display:none}.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:24px}.page-head h1{margin:0;font-size:1.8rem}.page-head p{color:var(--muted);margin:6px 0 0}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin:18px 0 28px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 5px 18px rgba(24,59,52,.05)}.stat-value{font-size:1.7rem;font-weight:900}.stat-label{font-weight:700;margin-top:4px}.stat-sub{font-size:.8rem;color:var(--muted);margin-top:4px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}.section-title{font-size:1.1rem;margin:0 0 14px}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:18px}.table{width:100%;border-collapse:collapse;min-width:760px}.table th,.table td{padding:14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}.table th{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);background:#fbfdfd}.table tr:last-child td{border-bottom:0}.badge{display:inline-flex;padding:5px 9px;border-radius:999px;font-size:.75rem;font-weight:800;background:#edf6f4;color:var(--brand)}.badge.warn{background:#fff6df;color:#8a5a00}.badge.danger{background:#feeceb;color:#a12720}.badge.gray{background:#f1f5f4;color:#61706d}.actions{display:flex;gap:8px;flex-wrap:wrap}.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}.filter-bar .input,.filter-bar .select{width:auto;min-width:180px}.participant-top{height:72px;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100vw - 960px)/2));position:sticky;top:0;z-index:30}.participant-main{width:min(960px,100%);margin:auto;padding:28px 20px 105px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-top:1px solid var(--line);display:none;justify-content:space-around;padding:8px 8px calc(8px + env(safe-area-inset-bottom));z-index:40}.bottom-nav a{display:flex;flex-direction:column;align-items:center;gap:3px;color:#50635f;font-size:.72rem;font-weight:700;min-width:66px;padding:5px}.bottom-nav span{font-size:1.2rem}.hero{background:linear-gradient(135deg,#0f766e,#0d9488);color:#fff;border-radius:24px;padding:26px;box-shadow:var(--shadow);margin-bottom:20px}.hero h1{margin:0 0 7px;font-size:1.8rem}.hero p{margin:0;color:#d5fffa}.progress-track{height:10px;border-radius:999px;background:rgba(255,255,255,.25);margin-top:18px;overflow:hidden}.progress-track>span{display:block;height:100%;background:#fff;border-radius:999px}.steps{display:grid;gap:12px}.step-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:17px;display:flex;align-items:center;gap:14px}.step-icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:var(--soft);color:var(--brand);font-weight:900}.step-card.locked{opacity:.6}.step-card.done .step-icon{background:#dff8ee;color:#087451}.step-main{flex:1}.step-title{font-weight:850}.step-sub{font-size:.84rem;color:var(--muted);margin-top:3px}.question-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;margin:12px 0}.question-number{font-size:.78rem;color:var(--brand);font-weight:900;margin-bottom:7px}.question-text{font-weight:750;line-height:1.45}.option-list{display:grid;gap:9px;margin-top:14px}.option{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);padding:12px;border-radius:13px;cursor:pointer}.option:hover{background:#f8fcfb}.option input{margin-top:3px;accent-color:var(--brand)}.form-progress{position:sticky;top:82px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 13px;margin-bottom:12px;z-index:15;box-shadow:0 4px 16px rgba(20,60,52,.06)}.video-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.video-card{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden}.video-thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#d6f5ef,#eafaf7);display:grid;place-items:center;font-size:2rem;color:var(--brand)}.video-body{padding:16px}.video-player{width:100%;border-radius:18px;background:#000;box-shadow:var(--shadow)}.chat{display:grid;gap:10px;margin:16px 0}.msg{max-width:78%;padding:12px 14px;border-radius:16px;background:#fff;border:1px solid var(--line);line-height:1.45}.msg.me{margin-left:auto;background:#dcf8f1;border-color:#b7eadf}.msg small{display:block;color:var(--muted);margin-top:5px}.impersonation{background:#fff4ce;border:1px solid #f5d56b;color:#6f5200;padding:8px 11px;border-radius:12px;font-size:.82rem;font-weight:750}.meter{height:8px;background:#e9efed;border-radius:999px;overflow:hidden}.meter span{display:block;height:100%;background:var(--brand2);border-radius:999px}.kpi-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0}.empty{text-align:center;padding:35px;color:var(--muted)}.credentials{background:#f5fbfa;border:1px dashed #9ddbd0;border-radius:14px;padding:14px;margin:14px 0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.divider{height:1px;background:var(--line);margin:20px 0}.readonly-answer{background:#f7faf9;border:1px solid var(--line);border-radius:12px;padding:12px;margin-top:10px}.note{padding:12px 14px;border-radius:13px;background:#fff8e8;border:1px solid #f6dfaa;color:#72520a}.section-tag{display:inline-block;margin:12px 0 0;background:#eaf7f4;color:var(--brand);padding:6px 10px;border-radius:999px;font-weight:800;font-size:.78rem}
@media(max-width:980px){.admin-sidebar{display:none}.admin-main{margin-left:0;padding:18px}.mobile-admin-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.stats-grid{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:1fr}}
@media(max-width:640px){.participant-top{padding:0 16px}.participant-main{padding:20px 14px 100px}.bottom-nav{display:flex}.hero{padding:21px;border-radius:20px}.hero h1{font-size:1.45rem}.video-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:1fr 1fr;gap:10px}.stat-card{padding:14px}.stat-value{font-size:1.4rem}.card{padding:18px;border-radius:18px}.page-head{display:block}.page-head .actions{margin-top:12px}.filter-bar{display:grid}.filter-bar .input,.filter-bar .select{width:100%}.question-card{padding:15px}.impersonation{font-size:.72rem;max-width:55%;}.admin-main{padding:14px}.table{min-width:680px}}

/* v2: participant header, mobile-first flow and richer admin controls */
.participant-site-title{font-weight:900;color:var(--ink);font-size:1.05rem;letter-spacing:-.01em}
.participant-top-actions{display:flex;align-items:center;gap:8px}
.participant-welcome{background:linear-gradient(135deg,#0f766e,#0d9488);color:#fff;border-radius:24px;padding:26px;box-shadow:var(--shadow);margin-bottom:12px}
.participant-welcome h1{margin:4px 0 7px;font-size:1.9rem;line-height:1.2}
.participant-welcome p{margin:0;color:#d5fffa}
.welcome-eyebrow{opacity:.85;font-weight:700}
.support-mini{display:flex;align-items:center;justify-content:space-between;gap:14px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:11px 12px 11px 15px;margin-bottom:18px;box-shadow:0 5px 18px rgba(24,59,52,.04)}
.support-mini-text{font-weight:750;font-size:.92rem}
.participant-flow .step-card{transition:.18s ease}
.participant-flow .step-card:not(.locked):hover{border-color:#b8dcd5;box-shadow:0 8px 22px rgba(24,59,52,.06)}
.step-action{display:flex;align-items:center;justify-content:flex-end}
.video-card-locked{opacity:.68}
.video-card-locked .video-thumb{filter:grayscale(.25)}
.login-simple-title{text-align:center;font-size:1.65rem;line-height:1.25;font-weight:900;letter-spacing:-.025em;margin:0 0 22px;color:var(--ink)}
.participant-login .card{box-shadow:0 16px 38px rgba(24,59,52,.10)}
.mobile-admin-nav{display:none}
.admin-video-list{display:grid;gap:14px}
.admin-video-item{border:1px solid var(--line);border-radius:16px;padding:16px;background:#fbfdfd}
.admin-video-status{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}
.video-edit-form .form-group{margin-bottom:12px}
.input-short{max-width:120px}
.question-admin-list{display:grid;gap:10px;margin-top:14px}
.question-admin-item{display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:12px;align-items:center;border:1px solid var(--line);border-radius:15px;padding:13px}
.question-admin-index{width:38px;height:38px;border-radius:12px;background:var(--soft);color:var(--brand);font-weight:900;display:grid;place-items:center}
.question-admin-main{min-width:0}
.question-admin-actions{justify-content:flex-end}
.check-row{display:flex;align-items:center;gap:10px;font-weight:700;cursor:pointer}
.check-row input{width:18px;height:18px;accent-color:var(--brand)}
.check-grid{display:flex;gap:24px;flex-wrap:wrap}
.options-editor{min-height:180px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem}

@media(max-width:980px){
  .mobile-admin-nav{display:flex;gap:8px;overflow-x:auto;padding:0 0 14px;margin:-4px 0 18px;scrollbar-width:thin}
  .mobile-admin-nav a{white-space:nowrap;display:flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:9px 11px;font-size:.8rem;font-weight:800;color:#36504b}
}

@media(max-width:640px){
  .participant-top{height:64px;padding:0 12px}
  .participant-site-title{font-size:.98rem}
  .participant-top .btn{min-height:38px;padding:8px 10px}
  .participant-main{padding:16px 12px 96px}
  .participant-welcome{padding:20px 18px;border-radius:19px}
  .participant-welcome h1{font-size:1.42rem}
  .participant-welcome p{font-size:.9rem;line-height:1.45}
  .support-mini{padding:9px 9px 9px 13px;border-radius:14px}
  .support-mini-text{font-size:.86rem}
  .step-card{align-items:flex-start;flex-wrap:wrap;padding:14px;gap:11px}
  .step-icon{width:38px;height:38px;border-radius:12px;flex:0 0 38px}
  .step-main{flex:1 1 calc(100% - 52px);min-width:0}
  .step-title{line-height:1.3}
  .step-sub{line-height:1.4}
  .step-action{width:100%;padding-left:49px;justify-content:flex-start}
  .step-action .btn{width:100%;min-height:42px}
  .step-action .badge{min-height:34px;align-items:center}
  .bottom-nav a{min-width:0;flex:1}
  .login-simple-title{font-size:1.4rem;margin-bottom:18px}
  .public-main{padding:18px 14px}
  .question-admin-item{grid-template-columns:38px minmax(0,1fr);align-items:start}
  .question-admin-actions{grid-column:1/-1;padding-left:50px;justify-content:flex-start}
  .question-admin-actions .btn{min-height:38px}
  .admin-video-layout{display:block}
  .admin-video-upload{margin-top:16px}
  .admin-video-status{align-items:center}
  .check-grid{display:grid;gap:12px}
  .page-head .btn{margin-top:12px}
}