:root{font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;color:#17243b;background:#f2f5fa;font-size:14px}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{opacity:.5;cursor:default}.top{background:#102a50;color:white;padding:13px clamp(14px,3vw,44px);display:flex;justify-content:space-between;align-items:center;gap:18px}.brand{font-weight:850;font-size:18px;letter-spacing:-.3px}.brand span{color:#49cae1}.top nav{display:flex;gap:9px;flex-wrap:wrap;align-items:center}.top button{background:#244365;color:white;border:1px solid #446488;padding:8px 12px;border-radius:8px}.top button:hover{background:#34577f}.shell{max-width:1280px;margin:28px auto;padding:0 18px}.card{background:white;border:1px solid #e0e7f0;border-radius:15px;padding:23px;box-shadow:0 5px 17px #102a5010}.card h2,.card h3{margin-top:0}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}.button{border:0;background:#176be7;color:white;border-radius:8px;padding:11px 17px;font-weight:700}.button.secondary{background:#eaf1fa;color:#1b416e}.button.warn{background:#dc3949}.button.green{background:#0a9874}.button:focus-visible,.qbtn:focus-visible{outline:3px solid #f19b38}.muted{color:#728197}.small{font-size:12px}.kpi{font-size:31px;font-weight:850;margin:8px 0;color:#143965}.form{display:grid;gap:13px;max-width:530px}.form label{display:grid;gap:5px;font-weight:650}.form input,.form select,.form textarea,.answer-num{border:1px solid #c9d4e2;border-radius:8px;padding:11px;background:white;width:100%;color:#15253a}.form textarea{min-height:96px}.hero{background:linear-gradient(115deg,#102b53,#186bb3);color:white;border-radius:16px;padding:32px;margin-bottom:20px}.hero h1{font-size:30px;margin:6px 0}.hero .muted{color:#d8e8fa}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.space{justify-content:space-between}.pill{background:#e9f1ff;color:#1a5bb0;padding:5px 10px;border-radius:30px;font-weight:650;font-size:12px}.pill.live{background:#d8f8ea;color:#0a7458}.alert{background:#fff2e4;border:1px solid #f1d5ae;color:#7d5010;padding:11px;border-radius:9px;margin:12px 0}.notice{background:#e9f7ff;border-radius:8px;padding:12px;margin:14px 0}.exam{min-height:calc(100vh - 56px);background:#edf3f9}.examhead{background:#fff;display:flex;justify-content:space-between;align-items:center;padding:14px 22px;border-bottom:1px solid #d8e2ec;gap:12px;flex-wrap:wrap}.examhead strong{font-size:18px}.timer{background:#142c53;color:white;padding:11px 16px;border-radius:7px;font-weight:800;font-variant-numeric:tabular-nums;font-size:17px}.examgrid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:16px;padding:16px;max-width:1520px;margin:auto}.examcenter{background:white;border:1px solid #dce5ef;border-radius:10px;min-height:600px;display:flex;flex-direction:column}.subjectbar{display:flex;border-bottom:1px solid #dbe3ec;overflow:auto}.subjectbar button{border:0;background:#f2f6fb;padding:13px 18px;color:#244264;font-weight:700;white-space:nowrap}.subjectbar .active{background:#176be7;color:white}.qarea{padding:27px;flex:1}.qtext{font-size:19px;line-height:1.65;white-space:pre-wrap;margin:22px 0}.choice{display:flex;align-items:flex-start;gap:12px;padding:14px;border:1px solid #d7e1ec;border-radius:9px;margin:11px 0;cursor:pointer}.choice.selected{background:#eaf4ff;border-color:#4793fa}.choice input{margin-top:4px}.exambottom{border-top:1px solid #e2e8ef;padding:15px;display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}.sidebar{background:white;border:1px solid #dce5ef;border-radius:10px;padding:15px;align-self:start}.palette{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:18px 0}.qbtn{height:40px;border:0;background:#e5e9ef;color:#243e5c;font-weight:750;border-radius:6px}.qbtn.current{outline:3px solid #145fe5}.qbtn.done{background:#25a375;color:#fff}.qbtn.review{background:#925ac7;color:white}.qbtn.unanswered{background:#e65c5c;color:white}.legend{display:grid;grid-template-columns:1fr 1fr;gap:9px;font-size:12px}.dot{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:5px;background:#e5e9ef}.dot.done{background:#25a375}.dot.review{background:#925ac7}.dot.unanswered{background:#e65c5c}.bar{background:#e6edf5;border-radius:20px;height:9px;overflow:hidden;margin-top:7px}.bar>div{height:100%;background:#176be7}.scorebox{background:#102e57;color:white;border-radius:13px;padding:26px}.scorebox .kpi{color:white;font-size:48px}.tablewrap{overflow-x:auto}table{border-collapse:collapse;width:100%}th,td{border-bottom:1px solid #e1e8f1;padding:11px;text-align:left;vertical-align:top}th{background:#f4f7fc}.stat{padding:20px;border-radius:12px;background:#f3f7fd}.status-correct{color:#078766}.status-incorrect{color:#c72c42}.status-unanswered{color:#6d7b8e}.mt{margin-top:18px}.mb{margin-bottom:16px}.hidden{display:none}pre{white-space:pre-wrap;word-wrap:break-word}@media(max-width:850px){.examgrid{grid-template-columns:1fr}.examcenter{min-height:450px}.sidebar{order:-1}.palette{grid-template-columns:repeat(10,1fr)}.qbtn{height:32px}.qarea{padding:17px}.hero{padding:22px}.top{align-items:flex-start}.brand{font-size:16px}}@media(max-width:450px){.palette{grid-template-columns:repeat(7,1fr)}.exambottom button{padding:9px}.shell{margin:14px auto}.card{padding:16px}}@media print{.top,.button,nav{display:none!important}.card{box-shadow:none}}

/* NTA-inspired CBT exam screen; independent NationScholars branding */
.nta-exam{font-family:Arial,sans-serif;background:white;min-height:100vh;color:#222;font-size:14px}.nta-brandbar{background:white;border-top:5px solid #3578a9;border-bottom:1px solid #dedede;display:flex;align-items:center;justify-content:space-between;padding:10px 22px;gap:15px}.nta-identity{display:flex;align-items:center;gap:12px;color:#1a4778;font-size:21px}.nta-mark{border-radius:50%;height:45px;width:45px;display:grid;place-items:center;background:#1b6896;color:white;font-weight:900;font-size:18px}.nta-tagline{font-size:11px;color:#5a6a79;font-weight:400;margin-top:3px}.nta-notice{color:#8b4f00;background:#fff4da;padding:6px 10px;font-size:10px;font-weight:700;letter-spacing:.2px}.nta-candidate{display:flex;align-items:center;justify-content:space-between;padding:10px 24px;background:#f8f8f8;gap:15px}.nta-profile{display:flex;gap:12px;align-items:center;font-size:12px;line-height:1.6}.nta-profile b{color:#f49d00}.nta-avatar{width:61px;height:59px;background:#ddd;display:grid;place-items:center;font-size:34px;color:#888;border:1px solid #bbb}.nta-clock{text-align:center;min-width:154px}.nta-clock span{display:block;color:#333;font-size:12px}.nta-clock b{display:block;color:#d00000;font-size:22px;font-variant-numeric:tabular-nums;margin-top:2px}.nta-toolbar{background:#f89720;color:white;display:flex;align-items:stretch;gap:18px;padding:0 20px;min-height:52px}.nta-toolbar>strong{display:flex;align-items:center}.nta-tabs{display:flex;gap:7px;align-items:center;flex:1;overflow:auto}.nta-tabs button{border:0;background:#397cb7;color:white;font-weight:700;padding:11px 17px;white-space:nowrap}.nta-tabs button.active{background:#17476d;box-shadow:inset 0 -3px #fff}.nta-lang{align-self:center;color:#222;font-size:12px;white-space:nowrap}.nta-lang select{padding:5px;max-width:100px}.nta-grid{display:grid;grid-template-columns:minmax(0,1fr) 315px;min-height:calc(100vh - 216px)}.nta-paper{min-width:0;display:flex;flex-direction:column;border-right:1px solid #d6d6d6}.nta-paper-top{padding:16px 22px;border-bottom:1px solid #c9c9c9;display:flex;gap:10px;justify-content:space-between;align-items:center}.nta-paper-top span{font-size:12px;color:#777}.nta-question{padding:24px 30px;flex:1;min-height:360px}.nta-questiontext{font-size:18px;line-height:1.6;white-space:pre-wrap;margin-bottom:30px}.nta-options{display:grid;gap:18px}.nta-option{display:flex;gap:15px;align-items:start;cursor:pointer;font-size:17px;line-height:1.4;padding:3px 5px}.nta-option.selected{background:#edf7ff}.nta-option input{margin-top:6px}.nta-numeric label{display:block;margin-bottom:10px;font-weight:bold}.nta-numeric input{padding:10px;border:1px solid #aaa;width:210px}.nta-actions{border-top:1px solid #ddd;padding:12px 18px;background:#fafafa}.nta-actionrow{display:flex;gap:8px;flex-wrap:wrap;margin:4px 0 10px}.nta-actionrow:last-child{margin-bottom:0}.nta-btn{border:1px solid #b4b4b4;background:#fff;color:#333;font-size:12px;font-weight:700;padding:11px 13px;border-radius:0}.nta-btn.saved{background:#5eae4a;color:white;border-color:#5eae4a}.nta-btn.savereview{background:#f2a74f;color:white;border-color:#f2a74f}.nta-btn.reviewbtn{background:#377cba;color:white;border-color:#377cba}.nta-btn.navbtn{background:#fff}.nta-navigation{justify-content:space-between}.nta-right{background:#e5f6fc;display:flex;flex-direction:column;min-height:500px}.nta-palette-heading{background:#337caf;color:white;padding:12px 15px;font-weight:bold}.nta-summary{background:#fff;padding:12px;display:grid;grid-template-columns:1fr 1fr;gap:9px;font-size:11px}.nta-summary>span{display:flex;align-items:center;gap:6px}.nta-summary-wide{grid-column:span 2}.nta-symbol{height:24px;min-width:29px;display:inline-grid;place-items:center;color:#fff;font-style:normal;font-weight:bold}.nta-symbol.unvisited,.nta-qbtn.unvisited{background:#e0e0e0;color:#333;border:1px solid #b9b9b9}.nta-symbol.unanswered,.nta-qbtn.unanswered{background:#e4541b;color:white;clip-path:polygon(0 0,100% 0,100% 77%,78% 100%,0 100%)}.nta-symbol.done,.nta-qbtn.done{background:#6dbb31;color:white;clip-path:polygon(20% 0,80% 0,100% 40%,100% 100%,0 100%,0 40%)}.nta-symbol.review,.nta-qbtn.review{background:#7443af;border-radius:50%;color:#fff}.nta-symbol.review-answered,.nta-qbtn.review-answered{background:#7443af;border-radius:50%;color:white;position:relative}.nta-symbol.review-answered:after,.nta-qbtn.review-answered:after{content:'✓';position:absolute;background:#47a629;font-size:10px;border-radius:50%;height:13px;width:13px;right:-2px;bottom:-2px;color:white;display:grid;place-items:center}.nta-choose{background:#337caf;color:white;font-size:13px;font-weight:bold;padding:10px 14px}.nta-palette{display:grid;grid-template-columns:repeat(5,1fr);justify-items:center;gap:10px 6px;padding:15px;align-content:start;flex:1}.nta-qbtn{border:0;width:39px;height:36px;font-weight:bold;cursor:pointer;font-size:13px}.nta-qbtn.current{outline:3px solid #0e659d;outline-offset:2px}.nta-submitrow{background:#fff;border-top:1px solid #ccc;padding:15px;text-align:center}.nta-btn.submit{background:#337caf;color:white;border-color:#337caf;width:150px}.nta-footer{border-top:1px solid #ddd;text-align:center;font-size:11px;padding:8px;color:#64748b;background:#f5f7f9}@media(max-width:850px){.nta-grid{grid-template-columns:1fr}.nta-right{min-height:auto}.nta-paper{border:0}.nta-palette{grid-template-columns:repeat(10,1fr)}.nta-notice{display:none}.nta-toolbar{padding:0 10px;gap:8px}.nta-tabs button{padding:9px}.nta-question{min-height:270px}.nta-candidate{padding:8px}}@media(max-width:520px){.nta-palette{grid-template-columns:repeat(6,1fr)}.nta-identity{font-size:15px}.nta-brandbar{padding:8px}.nta-toolbar>strong{display:none}.nta-paper-top{align-items:start;flex-direction:column}.nta-question{padding:16px}.nta-questiontext{font-size:16px}.nta-option{font-size:15px}.nta-clock b{font-size:17px}.nta-avatar{display:none}}

.listline{padding:15px 0;border-bottom:1px solid #e3eaf2}.listline:last-child{border-bottom:0}.note-reader{max-width:930px;margin:auto}.note-content{white-space:pre-wrap;line-height:1.85;font-size:16px;overflow-wrap:anywhere;padding:20px 0}.note-card{display:flex;flex-direction:column;gap:6px}.note-card button{align-self:flex-start}input[type=checkbox]{width:auto!important}select#notesSubject,input#notesSearch{padding:10px;border:1px solid #cbd6e2;border-radius:8px}

/* v7: Mobile-first improvements for iOS Safari and Android Chromium */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:16px}
body{overflow-x:hidden;min-width:0}
img,video,svg,canvas{max-width:100%;height:auto}
button,a,input,select,textarea{touch-action:manipulation}
input,select,textarea{max-width:100%;min-width:0}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #f59e0b;outline-offset:2px}
.nta-palette-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}
#palette-toggle{display:none;border:1px solid #d4edf9;border-radius:5px;background:#fff;color:#175683;min-height:40px;padding:8px 12px;font-weight:700}
.nta-palette-content{display:flex;flex-direction:column;flex:1;min-height:0}
.nta-palette-content .nta-palette{flex:1}
@media(max-width:900px){
 .shell{width:100%;padding-inline:14px}
 .top{flex-direction:column;align-items:stretch;padding:13px 14px}
 .top nav{display:flex;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:thin;padding-bottom:5px;overscroll-behavior-inline:contain}
 .top nav>*{flex-shrink:0}
 .top button,.button{min-height:44px}
 .grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr))}
 .nta-grid{grid-template-columns:minmax(0,1fr);display:flex;flex-direction:column}
 .nta-right{order:-1;min-height:0}
 #palette-toggle{display:inline-flex;align-items:center;justify-content:center}
 .nta-palette-content{display:none}
 .nta-palette-content.mobile-open{display:flex}
 .nta-palette{grid-template-columns:repeat(auto-fill,minmax(42px,1fr));gap:10px}
 .nta-qbtn{min-width:42px;min-height:42px}
 .nta-right{position:relative}
 .nta-candidate{gap:8px}
 .nta-actions{position:sticky;bottom:0;z-index:5;background:#fff;padding-bottom:calc(10px + env(safe-area-inset-bottom,0px));box-shadow:0 -3px 14px #0000000d}
 .nta-btn{min-height:44px}
 .nta-question{min-height:240px}
 .nta-paper{min-width:0}
 .nta-paper-top{flex-wrap:wrap}
 .nta-toolbar{min-width:0}
 .nta-tabs{min-width:0;scrollbar-width:thin}
 .nta-option{min-height:46px;padding:10px;border-radius:8px;border:1px solid #e6eaf0}
 .nta-option input{width:18px;height:18px;flex-shrink:0}
 .nta-numeric input{font-size:16px;width:min(100%,300px)}
 .tablewrap{max-width:100%;-webkit-overflow-scrolling:touch}
 .note-content,pre,.card{overflow-wrap:anywhere}
}
@media(max-width:600px){
 :root{font-size:14px}
 .shell{margin:12px auto;padding:0 10px}
 .card{padding:15px;border-radius:11px}
 .hero{padding:19px 16px}
 .hero h1{font-size:24px;line-height:1.2}
 .grid{grid-template-columns:1fr}
 .form{width:100%;max-width:100%}
 .form input,.form select,.form textarea,select#notesSubject,input#notesSearch{font-size:16px;min-height:44px}
 .row{max-width:100%}
 .row>input,.row>select{max-width:100%;flex:1 1 150px}
 .nta-brandbar{padding:8px 12px}
 .nta-identity{font-size:15px}
 .nta-mark{height:37px;width:37px;flex-shrink:0;font-size:15px}
 .nta-tagline{font-size:10px}
 .nta-candidate{padding:9px 10px;align-items:flex-start}
 .nta-profile{min-width:0;font-size:11px}
 .nta-profile>div:last-child{min-width:0;overflow-wrap:anywhere}
 .nta-clock{min-width:106px;flex-shrink:0}
 .nta-clock b{font-size:19px}
 .nta-clock span{font-size:10px}
 .nta-toolbar{padding:4px 8px;gap:4px}
 .nta-tabs button{min-height:43px;padding:9px 12px;font-size:12px}
 .nta-lang{display:none}
 .nta-paper-top{padding:12px;gap:6px}
 .nta-question{padding:13px 12px 22px}
 .nta-questiontext{font-size:16px;line-height:1.55;margin-bottom:16px;overflow-wrap:anywhere}
 .nta-options{gap:8px}
 .nta-option{font-size:15px;gap:10px}
 .nta-actions{padding:9px 8px calc(9px + env(safe-area-inset-bottom,0px))}
 .nta-actionrow{display:grid;grid-template-columns:1fr 1fr;gap:7px}
 .nta-actionrow .nta-btn{font-size:11px;line-height:1.25;padding:10px 5px;white-space:normal}
 .nta-palette-heading{padding:7px 12px}
 .nta-summary{gap:9px;padding:10px}
 .nta-palette{grid-template-columns:repeat(auto-fill,minmax(42px,1fr))}
 .nta-footer{padding-bottom:calc(8px + env(safe-area-inset-bottom,0px))}
 .scorebox .kpi{font-size:36px}
 table{font-size:12px}
 th,td{padding:9px 7px}
}
@media(max-width:360px){
 .nta-actionrow .nta-btn{font-size:10px}
 .nta-identity{font-size:13px}
 .nta-clock{min-width:92px}
 .nta-clock b{font-size:17px}
}
@media(hover:none) and (pointer:coarse){button,.nta-qbtn{min-height:44px}.nta-qbtn{min-width:44px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}

/* NationScholars AI Mentor responsive chat */
.mentor-head{display:flex;align-items:center;gap:18px;margin:20px 0}.mentor-head img{width:100px;height:100px;object-fit:cover;border-radius:22px;border:2px solid #bee2ef}.mentor-head h1{margin:0}.mentor-panel{max-width:930px;margin:auto}.mentor-conversation{background:#f4f8fc;border:1px solid #dce6ef;border-radius:14px;min-height:270px;max-height:60vh;overflow:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.mentor-bubble{padding:12px 15px;border-radius:14px;max-width:85%;white-space:normal;overflow-wrap:anywhere}.mentor-bubble.mine{background:#dceeff;align-self:flex-end}.mentor-bubble.mentor{background:white;align-self:flex-start;border:1px solid #dbe3ef}.mentor-message{white-space:pre-wrap;margin-top:6px;line-height:1.5}.mentor-form{display:flex;gap:12px;align-items:flex-end;margin-top:15px}.mentor-form textarea{flex:1;min-width:0;font-size:16px}.mentor-form button{min-height:48px}@media(max-width:600px){.mentor-head img{width:74px;height:74px}.mentor-head h1{font-size:23px}.mentor-bubble{max-width:97%}.mentor-form{flex-direction:column;align-items:stretch}.mentor-form button{width:100%}.mentor-conversation{max-height:52dvh;min-height:240px}}

/* V13 rich media and Mistake Notebook */
.question-asset{display:block;width:auto;max-width:100%;max-height:420px;object-fit:contain;margin:12px 0;border:1px solid #d9e2ee;border-radius:9px;background:white}.review-options{display:grid;gap:9px;margin:12px 0}.review-option{display:flex;align-items:flex-start;gap:10px;padding:9px;border:1px solid #e1e8f1;border-radius:8px}.review-option span{min-width:0}.rich-text{white-space:pre-wrap;overflow-wrap:anywhere}.question-rich{min-width:0}.nta-option .question-asset{max-height:180px}@media(max-width:600px){.question-asset{max-height:260px}.review-option{flex-wrap:wrap}}

/* Student-first homepage with separate role-specific modal login */
.auth-wrap{max-width:1080px;margin:55px auto;display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:start}.auth-intro{padding:35px 12px}.auth-intro h1{font-size:clamp(28px,3vw,44px);line-height:1.2;color:#112d54;margin:24px 0 12px}.auth-intro p{font-size:16px;line-height:1.65}.auth-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}.auth-actions .button{padding:14px 20px}.auth-registration{padding:30px}.auth-dialog{width:min(460px,calc(100vw - 28px));max-height:calc(100dvh - 24px);overflow-y:auto;border:1px solid #d6e1ed;border-radius:18px;padding:26px;background:#fff;color:#17243b;box-shadow:0 25px 90px #07152e55}.auth-dialog::backdrop{background:rgba(9,25,48,.62)}.auth-dialog-head{display:flex;align-items:start;justify-content:space-between;gap:12px;margin-bottom:19px}.auth-dialog-head h2{margin:0 0 5px}.auth-dialog-head p{margin:0}.auth-close{border:0;border-radius:8px;background:#eef2f8;color:#2e4768;font-size:26px;min-width:40px;min-height:40px}.auth-error{color:#a3172d;background:#fff1f3;padding:10px;border-radius:8px}.auth-error[hidden]{display:none}@media(max-width:780px){.auth-wrap{grid-template-columns:1fr;margin:18px auto;gap:8px}.auth-intro{padding:20px 6px}.auth-registration{padding:20px}.auth-actions .button{flex:1;min-width:160px}.auth-dialog{padding:20px}}