:root{--brand:#6f1d2b;--brand2:#8a293a;--ink:#172033;--muted:#667085;--line:#d9dee8;--soft:#f4f6fa;--paper:#fff;--ok:#087a55;--warn:#946200;--danger:#b42318;--blue:#155eef;--shadow:0 12px 34px rgba(23,32,51,.10);--radius:16px;--zoom:1}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:linear-gradient(180deg,#fafafa,#f1f3f7)}button,input,select,textarea{font:inherit}button{cursor:pointer}.hidden{display:none!important}.muted{color:var(--muted)}.small{font-size:13px}.center{text-align:center}.row{display:flex;align-items:center;gap:12px}.between{justify-content:space-between}.stack{display:flex;flex-direction:column;gap:14px}.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.wrap{max-width:1220px;margin:auto;padding:30px 22px 70px}.narrow{max-width:760px}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.topbar{height:68px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:30}.brand{display:flex;align-items:center;gap:12px;font-weight:850}.mark{width:38px;height:38px;border-radius:11px;background:var(--brand);color:#fff;display:grid;place-items:center;font-family:Georgia,serif;font-size:22px}.brand small{display:block;color:var(--muted);font-size:11px;letter-spacing:.08em}.nav{display:flex;gap:7px;align-items:center;flex-wrap:wrap}.btn{border:1px solid transparent;border-radius:10px;padding:10px 15px;font-weight:780;background:#fff;color:var(--ink);display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand2)}.btn-secondary{border-color:#c9cfda}.btn-ghost{background:transparent}.btn-danger{background:#fff1f0;border-color:#f2c2be;color:var(--danger)}.btn-sm{padding:7px 10px;font-size:13px}.btn-wide{width:100%}.btn.active{background:#f2e8ea;color:var(--brand)}.input,.select,.textarea{width:100%;border:1px solid #c9cfda;border-radius:10px;padding:12px 13px;background:#fff;outline:none}.input:focus,.select:focus,.textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(111,29,43,.12)}.textarea{min-height:100px;resize:vertical}.field{display:flex;flex-direction:column;gap:7px}.field label{font-weight:760;font-size:14px}.pill{display:inline-flex;align-items:center;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:850;background:#eef1f6;color:#495366}.pill.ok{background:#e8f7f0;color:var(--ok)}.pill.warn{background:#fff6df;color:var(--warn)}.pill.danger{background:#fff0ef;color:var(--danger)}.eyebrow{font-size:12px;font-weight:900;letter-spacing:.09em;text-transform:uppercase;color:var(--brand)}.notice{border-left:4px solid var(--brand);background:#faf6f7;border-radius:9px;padding:14px 16px;line-height:1.55}.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.stat .value{font-size:30px;font-weight:900}.stat .label{font-size:13px;color:var(--muted);margin-top:3px}.tablewrap{overflow:auto;border:1px solid var(--line);border-radius:12px}.table{width:100%;border-collapse:collapse;min-width:850px;background:#fff}.table th,.table td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}.table th{background:#f7f8fb;color:#4c5667;font-size:12px;text-transform:uppercase;letter-spacing:.04em}.table tr:last-child td{border-bottom:0}.empty{padding:34px;text-align:center;color:var(--muted)}.toast{position:fixed;right:22px;bottom:22px;background:#172033;color:#fff;padding:13px 16px;border-radius:10px;box-shadow:var(--shadow);z-index:100;max-width:390px}.toast.error{background:#8d1b13}.modalback{position:fixed;inset:0;background:rgba(10,16,28,.58);z-index:90;display:grid;place-items:center;padding:20px}.modal{background:#fff;width:min(820px,96vw);max-height:92vh;overflow:auto;border-radius:16px;box-shadow:0 30px 80px rgba(0,0,0,.27);padding:24px}.boot{min-height:100vh;display:grid;place-items:center;align-content:center;color:var(--muted)}.spinner{width:36px;height:36px;border:4px solid #e3e6ec;border-top-color:var(--brand);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
/* login */
.login-shell{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr}.login-story{background:linear-gradient(135deg,#5f1724,#852b3c);color:#fff;padding:70px;display:flex;flex-direction:column;justify-content:space-between}.login-story h1{font-size:48px;line-height:1.06;margin:18px 0}.login-story p{font-size:18px;line-height:1.65;max-width:650px;color:#f5e8eb}.login-panel{display:grid;place-items:center;padding:32px}.login-card{width:min(520px,100%)}.login-tabs{display:grid;grid-template-columns:1fr 1fr;background:#f0f2f6;border-radius:11px;padding:4px;margin-bottom:22px}.login-tabs button{border:0;background:transparent;border-radius:8px;padding:10px;font-weight:800}.login-tabs button.active{background:#fff;box-shadow:0 2px 8px rgba(23,32,51,.08);color:var(--brand)}.demo-box{margin-top:18px;padding:13px;background:#fff8e7;border:1px solid #eed8a7;border-radius:10px;font-size:13px}
/* dashboards */
.page-title h1{margin:5px 0 5px}.section{margin-top:22px}.assignment-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}.assignment-card{border:1px solid var(--line);border-radius:14px;background:#fff;padding:18px;box-shadow:0 4px 15px rgba(23,32,51,.05)}.assignment-card h3{margin:8px 0}.assignment-meta{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.score-card{display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;padding:15px;border:1px solid var(--line);border-radius:13px;background:#fff;margin:10px 0}.score-badge{width:70px;height:70px;border-radius:50%;background:#f5e9eb;display:grid;place-items:center;color:var(--brand);font-size:22px;font-weight:900}.staff-tabs{display:flex;gap:7px;flex-wrap:wrap;margin:18px 0}.action-row{display:flex;gap:7px;flex-wrap:wrap}.code{font-family:ui-monospace,monospace;background:#eef1f6;border-radius:7px;padding:5px 8px;font-weight:850;letter-spacing:.08em}.live-dot{width:9px;height:9px;border-radius:50%;background:#17a673;box-shadow:0 0 0 4px #e5f7f0}
/* test player */
.test-shell{min-height:100vh;background:#fff}.test-head{height:72px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 20px;position:sticky;top:0;background:#fff;z-index:40}.test-head .right{justify-self:end}.timer{font-variant-numeric:tabular-nums;font-weight:900;font-size:19px;border:1px solid var(--line);border-radius:10px;padding:8px 13px;min-width:96px;text-align:center}.timer.low{color:var(--danger);background:#fff5f4;border-color:#eeb3ae}.test-main{display:grid;grid-template-columns:minmax(280px,45%) minmax(360px,55%);min-height:calc(100vh - 134px);font-size:calc(16px * var(--zoom))}.passage-pane,.question-pane{padding:32px 38px;overflow:auto}.passage-pane{background:#fbfbfd;border-right:1px solid var(--line)}.passage{font-family:"Times New Roman",Times,serif;font-size:1.08em;line-height:1.7;white-space:pre-wrap;max-width:720px;margin:auto}.question-card{max-width:760px;margin:auto}.qmeta{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.qnum{width:36px;height:36px;border-radius:9px;background:#20293a;color:#fff;display:grid;place-items:center;font-weight:900}.prompt,.choice-text,.text-panel-body,.native-table{font-family:"Times New Roman",Times,serif}.prompt{font-size:1.1em;line-height:1.62;white-space:pre-wrap}.choices{display:flex;flex-direction:column;gap:11px;margin-top:22px}.choice{display:grid;grid-template-columns:34px 1fr 32px;gap:11px;align-items:start;border:1px solid #cbd1dc;border-radius:12px;padding:13px;background:#fff;text-align:left}.choice:hover{border-color:#939dad}.choice.selected{border:2px solid var(--brand);padding:12px;background:#fcf6f8}.choice.eliminated .choice-text{text-decoration:line-through;color:#969dac}.choice-letter{width:28px;height:28px;border:1px solid #aeb6c5;border-radius:50%;display:grid;place-items:center;font-weight:900}.selected .choice-letter{background:var(--brand);color:#fff;border-color:var(--brand)}.elim{border:0;background:transparent;color:#7b8494;font-weight:900;border-radius:6px}.elim:hover{background:#eef1f5}.numeric-box{margin-top:20px;max-width:300px}.image-stage{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;margin:16px 0;text-align:center}.image-stage img{display:block;max-width:100%;max-height:590px;margin:auto}.paired-texts{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:20px}.text-panel{border:1px solid #cfd6e2;border-radius:13px;overflow:hidden;background:#fff}.text-label{padding:9px 13px;background:#f1f4f9;border-bottom:1px solid #d7dde7;font-size:12px;font-weight:900;text-transform:uppercase;letter-spacing:.07em}.text-panel-body{padding:16px;line-height:1.65}.native-table{border-collapse:collapse;margin:18px auto}.native-table th,.native-table td{border:1px solid #616b7c;padding:9px 16px;text-align:center}.test-foot{height:62px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 20px;position:sticky;bottom:0;background:#fff;z-index:40}.test-foot .right{justify-self:end}.qmenu{display:grid;grid-template-columns:repeat(auto-fill,minmax(48px,1fr));gap:9px;margin:18px 0}.qchip{height:44px;border:1px solid #cbd1dc;border-radius:8px;background:#fff;font-weight:850;position:relative}.qchip.answered{background:#eaf3ff;border-color:#8db6e7}.qchip.flagged:after{content:'◆';font-size:8px;color:var(--brand);position:absolute;right:3px;top:2px}.qchip.current{outline:3px solid rgba(111,29,43,.17);border-color:var(--brand)}.math-root{display:inline-flex;align-items:flex-start;vertical-align:middle;white-space:nowrap}.math-root .radical{font-size:1.16em;line-height:.95}.math-root .radicand{border-top:1.7px solid currentColor;padding:.05em .15em 0 .12em;margin-left:-.07em;line-height:1.07}.math-exp,sup{font-size:.74em;line-height:0;vertical-align:baseline;position:relative;top:-.48em;font-weight:700}.test-tools{display:flex;gap:7px;flex-wrap:wrap}.reference-sheet{max-width:820px;overflow:auto;border:1px solid var(--line);border-radius:12px;background:#fff;padding:12px}.reference-sheet img{width:100%;min-width:650px}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.calc-grid button{padding:13px;border:1px solid var(--line);background:#fff;border-radius:9px;font-weight:800}.calc-display{text-align:right;font-size:23px;margin-bottom:10px}
/* reports */
.report-hero{display:grid;grid-template-columns:190px 1fr;gap:25px;align-items:center;background:linear-gradient(135deg,#fff,#faf4f6);border:1px solid #eadce0;border-radius:16px;padding:24px}.score-ring{width:155px;height:155px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--brand) calc(var(--pct)*1%),#eadfe2 0);position:relative;margin:auto}.score-ring:after{content:'';position:absolute;inset:12px;background:#fff;border-radius:50%}.score-ring>div{position:relative;z-index:1;text-align:center}.score-ring b{font-size:34px}.metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:11px;margin-top:16px}.metric{border:1px solid var(--line);border-radius:11px;padding:12px;background:#fff}.metric b{display:block;font-size:21px}.metric span{font-size:12px;color:var(--muted)}
@media(max-width:900px){.login-shell{grid-template-columns:1fr}.login-story{padding:40px}.login-story h1{font-size:38px}.test-main{grid-template-columns:1fr}.passage-pane{border-right:0;border-bottom:1px solid var(--line);max-height:45vh}.paired-texts{grid-template-columns:1fr}.grid4{grid-template-columns:repeat(2,1fr)}.report-hero{grid-template-columns:1fr}}
@media(max-width:650px){.wrap{padding:22px 13px 55px}.topbar{padding:0 13px}.brand small{display:none}.grid2,.grid3,.grid4,.metric-grid{grid-template-columns:1fr}.login-story{display:none}.login-panel{padding:18px}.passage-pane,.question-pane{padding:24px 18px}.test-head{padding:0 10px}.test-head .test-name{display:none}.test-tools .save-label{display:none}.score-card{grid-template-columns:auto 1fr}.score-card .btn{grid-column:1/-1}.nav .nav-label{display:none}}

/* Build 12 refinements */
button:disabled{cursor:not-allowed;opacity:.55}.timer-wrap{display:flex;align-items:center;gap:6px}.timer-toggle{border:0;background:transparent;color:var(--muted);font-size:11px;font-weight:800}.test-main.single-pane{grid-template-columns:1fr}.test-main.single-pane .question-pane{max-width:1040px;width:100%;margin:auto}.question-content{display:flex;flex-direction:column;gap:16px}.image-stage{margin:4px 0 8px}.image-stage figcaption{margin-top:10px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.figure-note{font-family:"Times New Roman",Times,serif;font-size:16px;color:var(--muted)}.image-stage img{cursor:zoom-in}.notes-panel{margin-top:20px;border-top:1px solid var(--line);padding-top:14px}.notes-panel summary{cursor:pointer;font-weight:800;color:var(--muted);margin-bottom:10px}.response-box{margin-top:20px}.figure-controls{display:flex;gap:8px;justify-content:center;margin:14px 0}.figure-zoom-wrap{max-height:72vh;overflow:auto;border:1px solid var(--line);background:#f7f8fb;border-radius:12px;padding:16px;text-align:center}.figure-zoom-wrap img{display:block;width:100%;max-width:none;margin:auto}.reference-native{font-family:"Times New Roman",Times,serif}.formula-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.formula-grid section{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fff}.formula-grid h3{font-family:Inter,ui-sans-serif,system-ui;margin-top:0}.formula-grid p{font-size:18px;margin:10px 0}.special-triangles{display:grid;grid-template-columns:1.2fr .9fr;gap:8px}.special-triangles svg{width:100%;height:auto}.qmenu-legend{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted)}.legend-box{display:inline-block;width:16px;height:16px;border:1px solid #cbd1dc;border-radius:4px;vertical-align:middle;margin-right:5px}.legend-box.answered{background:#eaf3ff;border-color:#8db6e7}.result-filters{display:grid;grid-template-columns:1fr 220px;gap:12px;margin:16px 0}.break-screen{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#f7f2f3,#eef1f6)}.break-card{max-width:560px;text-align:center}.break-timer{font-size:64px;font-weight:900;font-variant-numeric:tabular-nums;color:var(--brand);margin:22px 0}.question-pane{scroll-behavior:smooth}.choice:focus-visible,.btn:focus-visible,.qchip:focus-visible{outline:3px solid rgba(21,94,239,.35);outline-offset:2px}.build-badge{font-size:11px;color:var(--muted)}
@media(max-width:700px){.formula-grid,.result-filters{grid-template-columns:1fr}.test-head{grid-template-columns:1fr auto}.test-head>.right{grid-column:1/-1;justify-self:stretch;justify-content:flex-end;padding-bottom:6px}.test-head{height:auto;min-height:72px;padding-top:8px}.test-main{min-height:calc(100vh - 150px)}.test-foot{height:auto;min-height:62px;padding:8px 10px}.test-foot>div:nth-child(2){display:none}}

/* Build 14: module-aware explanation review */
.review-module-heading{margin:28px 0 8px;padding:10px 14px;border-left:5px solid var(--brand);background:#f6f1f2;border-radius:8px;font-weight:900;font-size:17px}.review-title{display:flex;align-items:baseline;justify-content:space-between;gap:16px;flex-wrap:wrap}.review-answer-row{display:flex;gap:26px;flex-wrap:wrap;margin-top:7px;font-size:14px}.review-explanation{margin:16px 0 2px;line-height:1.6}.review-card{border-color:#d5dbe5}.image-stage{overflow:visible}.image-stage img{object-fit:contain;height:auto}

/* Trial-run admin, responsive, PIN, math, and figure refinements */
.release-status{display:flex;flex-direction:column;gap:5px;font-size:12px}.release-status span{white-space:nowrap}.page-title{flex-wrap:wrap}.staff-tabs{position:sticky;top:68px;z-index:20;background:rgba(250,250,250,.96);padding:10px 0;backdrop-filter:blur(8px)}
@media(max-width:650px){.nav .user-name{display:none}.staff-tabs{top:68px;overflow-x:auto;flex-wrap:nowrap;padding-bottom:11px}.staff-tabs .btn{flex:0 0 auto}.page-title>.btn{width:100%}}

/* First-login PINs, true fractions, and measured figure safe areas */
.identity-summary{display:flex;align-items:center;justify-content:space-between;gap:12px;background:#f7f8fb;border:1px solid var(--line);border-radius:11px;padding:13px 14px;margin:12px 0 18px}.pin-code{font-size:16px}.pin-mask{font-size:20px;letter-spacing:.16em;color:#475467}.math-frac{display:inline-flex;flex-direction:column;align-items:stretch;justify-content:center;vertical-align:-.48em;line-height:1.02;text-align:center;white-space:nowrap;margin:0 .10em;font-size:.96em}.math-frac .math-num{display:block;border-bottom:1.65px solid currentColor;padding:0 .18em .08em}.math-frac .math-den{display:block;padding:.08em .18em 0}.math-exp .math-frac{font-size:.82em;vertical-align:-.5em}.math-exp-fraction{top:-.72em}.numeric-preview{margin-top:2px;border:1px solid #e2e6ee;border-radius:9px;background:#f8f9fb;padding:9px 11px;min-height:42px}.numeric-preview-value{font-family:"Times New Roman",Times,serif;font-size:19px;margin-left:6px}.image-stage{padding:20px;min-width:0}.image-stage img{width:auto;height:auto;max-width:100%;max-height:min(590px,68vh);object-fit:contain}.figure-zoom-wrap{background:#fff}.figure-zoom-wrap img{height:auto;object-fit:contain}.elim{font-size:15px;line-height:1;text-align:center}.choice.eliminated .elim{color:var(--danger);background:#fff0ef}.reference-native .math-frac{font-size:.9em}.table .pin-code{white-space:nowrap}
@media(max-width:650px){.identity-summary{align-items:flex-start;flex-direction:column}.image-stage{padding:14px}.math-frac{font-size:.92em}}

/* Minimal sign-in and verified source rendering */
.minimal-login{min-height:100vh;display:grid;place-items:center;padding:40px 20px;background:#f6f4f0}
.minimal-login-inner{width:min(520px,100%)}
.minimal-login-brand{display:flex;align-items:center;justify-content:center;gap:13px;margin-bottom:24px;text-align:center}
.minimal-login-brand h1{font-family:Georgia,"Times New Roman",serif;font-size:clamp(26px,5vw,36px);font-weight:600;letter-spacing:-.02em;margin:0;color:#241d1f}
.minimal-login .login-card{box-shadow:0 18px 55px rgba(47,31,35,.08);border-color:#ded8d3;padding:30px}
.minimal-login .login-card h2{font-size:23px;margin:4px 0 22px}
.minimal-login .login-tabs{background:#eeeae6;margin-bottom:26px}
.minimal-login .login-tabs button{font-size:13px;padding:11px 8px}
.minimal-login .login-help{text-align:center;margin:0}
.source-rich{white-space:normal;overflow-wrap:anywhere}
.source-rich .source-line,.source-rich .source-paragraph{display:block;line-height:1.58;margin:.08em 0}
.source-rich .source-paragraph{margin:.65em 0}
.source-rich img{max-width:100%;height:auto;object-fit:contain}
.source-rich img.source-inline-math{display:inline-block;vertical-align:middle;margin:0 .08em;max-height:none}
.source-rich img.source-question-crop,.source-rich img.source-explanation-crop{display:block;margin:0 auto;max-height:none}
.source-rich img.source-choice-crop{display:inline-block;vertical-align:top;max-height:none}
.source-rich img.source-figure-image{display:block;margin:12px auto;max-height:min(590px,68vh)}
.source-rich .source-figure-line{text-align:center}
.choice-text.source-rich{min-width:0;line-height:1.5}
.review-explanation.source-rich{font-family:"Times New Roman",Times,serif}
@media(max-width:650px){.minimal-login{padding:24px 14px}.minimal-login .login-card{padding:22px}.minimal-login-brand{align-items:flex-start}.minimal-login-brand h1{font-size:27px;text-align:left}}

/* Protected test-library installation and clear multi-test assignment */
.test-library-alert{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 18px;background:#fff8e7;border-left-color:#b7791f}
.test-library-ready{margin:18px 0;background:#f1fbf4;border-left-color:var(--ok)}
#assignTestSummary{margin-top:4px;background:#f7f8fb;border-left-color:#98a2b3}
@media(max-width:650px){.test-library-alert{align-items:stretch;flex-direction:column}.test-library-alert .btn{width:100%}}