:root{--plh-red:#c80000;--plh-red2:#aa0000;--plh-bg:#f4f5f7;--plh-border:#e4e7ec;--plh-text:#172b4d;--plh-muted:#667085;--plh-green:#12b76a;--plh-orange:#f79009;--plh-blue:#2e90fa;--plh-danger:#d92d20}*{box-sizing:border-box}body.plh-app-body{margin:0!important;background:var(--plh-bg)!important;color:var(--plh-text);font-family:Arial,Helvetica,sans-serif}.plh-app-body a{text-decoration:none}.plh-powerbar{position:sticky;top:0;z-index:9999;min-height:82px;background:linear-gradient(180deg,var(--plh-red),var(--plh-red2));display:flex;align-items:stretch;color:#fff;box-shadow:0 2px 8px rgba(0,0,0,.18)}.plh-powerbrand{display:flex;align-items:center;gap:9px;padding:10px 14px;color:#fff;min-width:225px}.plh-brandmark{width:40px;height:40px;border-radius:8px;background:#fff;color:var(--plh-red);display:grid;place-items:center;font-weight:900}.plh-powerbrand b{display:block;font-size:12px}.plh-powerbrand small{display:block;font-size:9px;opacity:.8;margin-top:3px}.plh-powernav{display:flex;flex:1;align-items:center;gap:2px;overflow-x:auto;padding:0 4px}.plh-powernav a{color:#fff;font-size:10px;font-weight:800;padding:12px 9px;border-radius:5px;white-space:nowrap}.plh-powernav a:hover,.plh-powernav a.active{background:rgba(255,255,255,.18)}.plh-userbox{min-width:210px;padding:9px 14px;display:grid;grid-template-columns:1fr auto;align-content:center;gap:2px 10px;text-align:right;font-size:10px}.plh-userbox strong{font-size:11px}.plh-userbox small{grid-column:1}.plh-userbox a{grid-column:2;grid-row:1/4;align-self:center;background:#9e0000;color:#fff;padding:10px;border-radius:5px;font-weight:800}.plh-workspace{max-width:1320px;margin:0 auto;padding:38px 24px 60px}.plh-pagehead{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.plh-pagehead h1{margin:0;font-size:25px;font-weight:500}.plh-pagehead p{margin:5px 0 0;color:var(--plh-muted);font-size:12px}.plh-privacybar{background:#fff7e8;border-left:4px solid #f5a623;padding:9px 12px;border-radius:8px;margin:10px 0 16px;font-size:12px}.plh-kpis{display:grid;grid-template-columns:repeat(6,minmax(120px,1fr));gap:12px;margin:14px 0 24px}.plh-kpi{background:#fff;border:1px solid var(--plh-border);border-top:4px solid #d0d5dd;border-radius:12px;padding:13px 14px;min-height:86px;box-shadow:0 1px 3px rgba(16,24,40,.06)}.plh-kpi.green{border-top-color:var(--plh-green);background:#effaf5}.plh-kpi.orange{border-top-color:var(--plh-orange);background:#fff7e8}.plh-kpi.blue{border-top-color:var(--plh-blue);background:#eff8ff}.plh-kpi.red{border-top-color:var(--plh-danger);background:#fff1f0}.plh-kpi.gray{background:#f2f4f7}.plh-kpi span{font-size:10px;font-weight:800;display:block}.plh-kpi strong{display:block;font-size:28px;margin-top:7px}.plh-kpi small{font-size:10px;color:var(--plh-muted)}.plh-three{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}.plh-action,.plh-panel{background:#fff;border:1px solid var(--plh-border);border-radius:12px;box-shadow:0 1px 3px rgba(16,24,40,.05);padding:18px}.plh-action h2,.plh-panel h2{margin:0 0 8px;font-size:17px}.plh-action p,.plh-panel p{color:var(--plh-muted)}.plh-bigbtn,.plh-btn{display:inline-block;background:var(--plh-red);border:1px solid var(--plh-red);color:#fff!important;border-radius:5px;padding:10px 14px;font-size:11px;font-weight:800;cursor:pointer}.plh-bigbtn{display:block;text-align:center;margin-top:20px}.plh-btn.small{padding:7px 9px;font-size:10px}.plh-btn.ghost{background:#fff;color:var(--plh-red)!important}.plh-btn:hover,.plh-bigbtn:hover{filter:brightness(.92)}.plh-two{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0}.plh-panel{margin:16px 0}.plh-panelhead{display:flex;justify-content:space-between;gap:12px}.plh-tablewrap{overflow:auto}.plh-table{width:100%;border-collapse:collapse;background:#fff;font-size:12px}.plh-table th{background:#f8fafc;text-align:left;color:#475467;font-size:10px;text-transform:uppercase;letter-spacing:.03em}.plh-table th,.plh-table td{padding:10px;border-bottom:1px solid #eaecf0;vertical-align:middle}.plh-badge{display:inline-block;background:#eef2f6;padding:3px 8px;border-radius:20px;font-size:10px}.plh-badge.orange{background:#fff4e5;color:#b54708}.plh-package-grid{display:grid;grid-template-columns:repeat(3,minmax(220px,1fr));gap:14px}.plh-package-grid.compact{grid-template-columns:repeat(3,minmax(200px,1fr))}.plh-package{border:1px solid var(--plh-border);background:#fff;border-radius:12px;padding:16px;position:relative}.plh-package.disabled{opacity:.55}.plh-package-icon{font-size:28px}.plh-package h3{margin:7px 0}.plh-package p,.plh-package li{font-size:12px;color:#475467}.plh-package ul{padding-left:18px;min-height:80px}.plh-package-meta{display:flex;justify-content:space-between;color:#667085;font-size:11px;padding:8px 0;border-top:1px solid #eaecf0}.plh-actions{display:flex;gap:7px;flex-wrap:wrap}.plh-formgrid{display:grid;grid-template-columns:repeat(2,minmax(160px,1fr));gap:12px}label{font-size:12px;font-weight:700;color:#344054;display:block;margin:10px 0}input,select,textarea{width:100%;margin-top:5px;padding:9px 10px;border:1px solid #d0d5dd;border-radius:7px;background:#fff;font:inherit}textarea{resize:vertical}.plh-checks{display:flex;flex-wrap:wrap;gap:10px 18px;margin:14px 0}.plh-checks label{display:flex;align-items:center;gap:7px;margin:0;font-weight:600}.plh-checks input{width:auto;margin:0}.plh-service-grid{display:grid;grid-template-columns:repeat(2,minmax(240px,1fr));gap:10px}.plh-service{border:1px solid var(--plh-border);border-left:4px solid #98a2b3;background:#fff;border-radius:9px;padding:12px;display:grid;grid-template-columns:1fr auto;gap:5px 12px;align-items:center}.plh-service.on{border-left-color:var(--plh-green);background:#f6fef9}.plh-service.off{background:#f9fafb}.plh-service strong,.plh-service small{display:block}.plh-service small{color:#667085;font-size:10px;margin-top:3px}.plh-service span{font-size:10px;font-weight:800}.plh-service a{grid-column:2;color:#b42318;font-size:10px;font-weight:700}.plh-user-list>div,.plh-list>div,.plh-listrow,.plh-invite{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid #eaecf0}.plh-user-list small,.plh-list small,.plh-listrow small,.plh-invite small{display:block;color:#667085;font-size:10px}.plh-avatar{width:34px;height:34px;background:#eef2f6;border-radius:50%;display:grid;place-items:center;font-weight:800}.plh-list>div a{margin-left:auto}.plh-inline-form{display:inline-block;margin-left:8px}.plh-message{padding:12px 0;border-bottom:1px solid #eaecf0}.plh-message small{display:block;color:#667085;font-size:10px;margin:3px 0}.plh-notice{padding:10px 12px;border-radius:7px;margin:12px 0;font-size:12px}.plh-notice.success{background:#ecfdf3;color:#027a48}.plh-notice.error{background:#fef3f2;color:#b42318}.plh-empty,.plh-muted{color:#667085}.plh-securitytabs{display:flex;gap:6px;flex-wrap:wrap;margin:18px 0}.plh-securitytabs button{border:1px solid #d0d5dd;background:#fff;border-radius:6px;padding:8px 11px;font-size:10px;font-weight:800;cursor:pointer}.plh-securitytabs button.active{background:var(--plh-red);color:#fff;border-color:var(--plh-red)}.plh-security-section{display:none}.plh-security-section.active{display:block}.plh-live-toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.plh-live-toolbar span{background:#f2f4f7;border:1px solid #d0d5dd;padding:8px 10px;border-radius:7px;font-size:10px;font-weight:800}.plh-live-toolbar span.on{background:#ecfdf3;border-color:#6ce9a6;color:#027a48}.plh-live-toolbar span.warn{background:#fff4e5;border-color:#fec84b;color:#b54708}.plh-live-toolbar span.off{opacity:.55}.plh-room{height:calc(100vh - 240px);min-height:560px;background:#101828;border-radius:10px;overflow:hidden}.plh-room iframe{width:100%;height:100%;border:0}.plh-login-shell{min-height:100vh;background:linear-gradient(135deg,#f8fafc,#eef2f6);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px}.plh-login-brand{display:flex;align-items:center;gap:12px;margin-bottom:18px}.plh-login-brand .plh-logo-mark{width:52px;height:52px;border-radius:12px;background:var(--plh-red);color:#fff;display:grid;place-items:center;font-size:20px;font-weight:900}.plh-login-brand strong{font-size:22px;display:block}.plh-login-brand span{font-size:11px;color:#667085}.plh-login-card{width:min(440px,100%);background:#fff;border:1px solid var(--plh-border);border-radius:16px;padding:28px;box-shadow:0 16px 40px rgba(16,24,40,.12)}.plh-login-card h1{margin-top:0}.plh-login-card .login-submit input{width:100%;background:var(--plh-red);color:#fff;border:0;font-weight:800;cursor:pointer}.plh-login-help{font-size:10px;color:#667085;margin-top:16px;text-align:center}.plh-login-card .login-remember label{display:flex;align-items:center;gap:7px}.plh-login-card .login-remember input{width:auto;margin:0}@media(max-width:1100px){.plh-powerbar{position:static;display:block}.plh-powerbrand{min-width:0}.plh-powernav{padding:5px 10px 10px}.plh-userbox{display:none}.plh-kpis{grid-template-columns:repeat(3,1fr)}.plh-package-grid,.plh-package-grid.compact{grid-template-columns:repeat(2,1fr)}}@media(max-width:760px){.plh-workspace{padding:22px 12px}.plh-kpis{grid-template-columns:repeat(2,1fr)}.plh-three,.plh-two,.plh-formgrid,.plh-service-grid,.plh-package-grid,.plh-package-grid.compact{grid-template-columns:1fr}.plh-powernav a{font-size:9px}.plh-room{min-height:480px}}
.plh-register{margin-top:18px;border-top:1px solid var(--plh-border);padding-top:14px}.plh-register summary{cursor:pointer;color:var(--plh-red);font-weight:800;font-size:12px}.plh-consent{display:flex;gap:8px;align-items:flex-start}.plh-consent input{width:auto;margin-top:2px}.plh-user-row{flex-wrap:wrap}.plh-user-main{flex:1}.plh-user-edit{display:none;width:100%;padding:12px;background:#f8fafc;border:1px solid #eaecf0;border-radius:8px}.plh-user-edit.open{display:block}.plh-ai{position:fixed;right:18px;bottom:18px;z-index:10000}.plh-ai-toggle{border:0;background:#1663d8;color:#fff;border-radius:22px;padding:11px 16px;font-weight:800;box-shadow:0 4px 14px rgba(0,0,0,.22);cursor:pointer}.plh-ai-panel{display:none;position:absolute;right:0;bottom:52px;width:min(360px,90vw);height:470px;background:#fff;border:1px solid var(--plh-border);border-radius:14px;box-shadow:0 18px 55px rgba(16,24,40,.25);padding:12px}.plh-ai-panel.open{display:flex;flex-direction:column}.plh-ai-head{display:flex;align-items:center;justify-content:space-between;padding:5px 3px 10px}.plh-ai-close{border:0;background:transparent;font-size:24px;cursor:pointer}.plh-ai-chat{flex:1;overflow:auto;background:#f8fafc;border-radius:8px;padding:9px}.plh-ai-input{margin:8px 0}.plh-ai-msg{max-width:88%;padding:8px 10px;border-radius:10px;margin:7px 0;font-size:12px;white-space:pre-wrap}.plh-ai-msg.user{margin-left:auto;background:#eaf2ff}.plh-ai-msg.bot{background:#fff;border:1px solid #e4e7ec}.plh-codebox{padding:12px;border-radius:8px;background:#f8fafc;border:1px solid #eaecf0;font-family:monospace;font-size:12px}

/* ===== v2.7.0 additions ===== */
.plh-hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;overflow:hidden}
.plh-inline-form{display:inline-block;margin:0 2px}
.plh-linkbtn{background:none;border:0;padding:0;color:var(--plh-red);font-weight:800;cursor:pointer;text-decoration:underline;font-size:inherit}
.plh-reauth{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-end}.plh-reauth p{flex-basis:100%;margin:0 0 4px}
.plh-codebox code{word-break:break-all}
.plh-live-status{margin:10px 0;padding:10px 12px;border-radius:8px;background:#f2f4f7;font-size:13px}.plh-live-status.is-live{background:#effaf5}
.plh-question{border:1px solid var(--plh-border);border-radius:10px;padding:12px 14px;margin:12px 0}.plh-question legend{padding:0 6px}.plh-question label{display:block;margin:6px 0;font-weight:400}
.plh-quiz-timer{font-size:15px;position:sticky;top:90px;background:#fff7e8;padding:8px 12px;border-radius:8px;z-index:5}
.plh-ai-notice{font-size:11px;background:#fff7e8;border:1px solid #fde3b0;border-radius:8px;padding:8px;margin-bottom:6px}.plh-ai-notice label{display:block;margin-top:6px;font-weight:700}
.plh-shake{animation:plh-shake .3s}@keyframes plh-shake{25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.plh-idle-warning{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:100000;background:#fff;border:2px solid var(--plh-orange);border-radius:12px;padding:14px 18px;box-shadow:0 18px 55px rgba(16,24,40,.3);max-width:min(440px,92vw);text-align:center}
.plh-certificate{background:#fff;border:10px double var(--plh-red);padding:28px;margin:16px auto;max-width:900px;text-align:center}.plh-cert-inner h1{font-size:30px;margin:8px 0}.plh-cert-inner h2{font-size:26px;margin:10px 0}.plh-cert-org{font-weight:900;letter-spacing:.08em;color:var(--plh-red)}.plh-cert-code{font-size:11px;color:var(--plh-muted);margin-top:24px}
/* keyboard focus */
.plh-app-body a:focus-visible,.plh-app-body button:focus-visible,.plh-app-body input:focus-visible,.plh-app-body select:focus-visible,.plh-app-body textarea:focus-visible,.plh-app-body summary:focus-visible{outline:3px solid #2e90fa;outline-offset:2px;box-shadow:none}
.plh-powernav a:focus-visible,.plh-powerbrand:focus-visible{outline-color:#fff}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
@media print{.plh-powerbar,.plh-ai,.plh-noprint,.plh-pagehead,.plh-notice,.plh-idle-warning{display:none!important}.plh-certificate{border-width:8px;margin:0}body.plh-app-body{background:#fff!important}}
/* dark mode (desk pages) */
@media (prefers-color-scheme:dark){
 :root{--plh-bg:#0f1115;--plh-border:#2a2f3a;--plh-text:#e6e8ee;--plh-muted:#a3aab8}
 body.plh-app-body{color:var(--plh-text)}
 .plh-app-body .plh-panel,.plh-app-body .plh-kpi,.plh-app-body .plh-action,.plh-app-body .plh-table,.plh-app-body .plh-package,.plh-app-body .plh-service,.plh-app-body .plh-login-card,.plh-app-body .plh-ai-panel,.plh-app-body .plh-securitytabs button,.plh-app-body .plh-idle-warning,.plh-app-body .plh-ai-msg.bot{background:#171a21!important;color:var(--plh-text);border-color:var(--plh-border)}
 .plh-app-body .plh-kpi.green{background:#0f2a1f!important}.plh-app-body .plh-kpi.orange,.plh-app-body .plh-quiz-timer,.plh-app-body .plh-ai-notice{background:#2d220c!important}.plh-app-body .plh-kpi.blue{background:#0d2238!important}.plh-app-body .plh-kpi.red{background:#2f1210!important}
 .plh-app-body input,.plh-app-body select,.plh-app-body textarea{background:#0f1115!important;color:var(--plh-text);border-color:var(--plh-border)}
 .plh-app-body .plh-btn.ghost{background:transparent!important}
 .plh-app-body .plh-ai-chat,.plh-app-body .plh-live-status{background:#11141a!important}.plh-app-body .plh-ai-msg.user{background:#1d2c45}
 .plh-app-body .plh-table th,.plh-app-body .plh-table td{border-color:var(--plh-border)}
 .plh-certificate{background:#fff!important;color:#172b4d!important}
}

/* ===== v2.8.0: materials, handbooks, student record ===== */
.plh-muted-row{opacity:.6}
.plh-code{font-family:Consolas,Menlo,monospace;font-size:12px}
.plh-handbook,.plh-record{background:#fff;border:1px solid var(--plh-border);border-radius:12px;padding:28px 34px;max-width:900px;margin:16px auto;line-height:1.6;font-size:15px}
.plh-handbook h1,.plh-record h1{margin:4px 0 6px}.plh-handbook h2{margin-top:30px;padding-top:10px;border-top:2px solid var(--plh-border);scroll-margin-top:100px}
.plh-handbook li{margin:4px 0}.plh-toc{background:#f8fafc;border-radius:10px;padding:12px 18px;margin:16px 0}.plh-toc ol{margin:6px 0 0}
.plh-record section{margin:14px 0}.plh-record .plh-formgrid div{font-size:13px}
@media (prefers-color-scheme:dark){.plh-app-body .plh-handbook,.plh-app-body .plh-record{background:#171a21!important;color:var(--plh-text)}.plh-app-body .plh-toc{background:#11141a}}
@media print{.plh-handbook,.plh-record{border:0;max-width:none;margin:0;padding:0;background:#fff!important;color:#000!important;font-size:12pt}.plh-handbook h2{page-break-after:avoid}.plh-toc a{color:#000}.plh-workspace{padding:0!important}}
/* v2.9.0 checkup */
.plh-badge.red{background:#fee4e2;color:#b42318}.plh-badge.gray{background:#f2f4f7;color:#475467}
.plh-checkup td{vertical-align:top;font-size:12px}.plh-checkup td:last-child{color:var(--plh-muted)}
/* v3 teacher/student live connection */
.plh-class-waiting{text-align:center;padding:32px}.plh-class-waiting h2{font-size:22px}.plh-connection-state{display:inline-block;margin-top:10px;padding:8px 12px;border-radius:20px;background:#ecfdf3;color:#027a48;font-size:11px;font-weight:800}.plh-presence-list{display:grid;gap:7px}.plh-presence-person{display:grid;grid-template-columns:18px 1fr auto;align-items:center;gap:7px;padding:9px 10px;border:1px solid #eaecf0;border-radius:8px}.plh-presence-person .plh-dot{color:#98a2b3}.plh-presence-person.online .plh-dot{color:#12b76a}.plh-presence-person.offline{opacity:.72}.plh-presence-person small{color:#667085;font-size:10px}