:root{color-scheme:light;--bg:#f5f7fb;--card:#fff;--ink:#172238;--muted:#53627a;--line:#d8deea;--accent:#2459c4;--soft:#eaf0ff;--warn:#fff1d6;--good:#e4f6ec;--shadow:0 8px 26px #15274b0b;font:16px/1.5 system-ui,-apple-system,"Segoe UI",sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}body.dark{color-scheme:dark;--bg:#111827;--card:#1b2637;--ink:#edf2fc;--muted:#b3bfd1;--line:#37465c;--accent:#9bb8ff;--soft:#263755;--warn:#49391d;--good:#173e2b;--shadow:0 8px 26px #0003}.top,main,footer{width:min(900px,100% - 28px);margin:auto}.top{padding:24px 0 12px;display:flex;align-items:center;justify-content:space-between}.top h1{margin:0;font-size:1.8rem}.eyebrow{margin:0;color:var(--muted);letter-spacing:.12em;font-size:.72rem;font-weight:750}.card,.panel>article,.panel>.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:var(--shadow)}.intro{margin:12px 0 18px}.intro h2{margin:.1em 0}.small,.muted{color:var(--muted);font-size:.91rem}.warning{background:var(--warn);border:1px solid var(--line);border-radius:12px;padding:12px;margin:10px 0}.tabs{display:flex;gap:8px;overflow:auto;padding:4px 0 14px}.tabs button{white-space:nowrap}.panel{min-height:220px}.stack{display:grid;gap:14px}.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.between{justify-content:space-between}h2,h3{line-height:1.25}button,.button,select,input,textarea{font:inherit}button,.button{min-height:46px;padding:9px 15px;border:1px solid var(--line);border-radius:12px;background:var(--card);color:var(--ink);font-weight:650;cursor:pointer}button:hover,.button:hover{border-color:var(--accent)}button.primary{background:var(--accent);color:#fff;border-color:var(--accent)}button.active{background:var(--soft);border-color:var(--accent);color:var(--accent)}button:disabled{opacity:.5;cursor:not-allowed}.quiet{background:transparent}.pill{display:inline-block;padding:3px 9px;border-radius:20px;background:var(--soft);font-size:.8rem;color:var(--ink)}.list{display:grid;gap:10px}.pack{padding:14px;border:1px solid var(--line);border-radius:14px}.pack h3{margin:.15em 0}.question{font-size:1.2rem;font-weight:700}.option{display:flex;gap:12px;align-items:flex-start;padding:12px;border:1px solid var(--line);border-radius:12px;cursor:pointer}.option:has(input:checked){border-color:var(--accent);background:var(--soft)}.option input{margin-top:5px;accent-color:var(--accent)}.feedback{padding:14px;border-radius:12px;background:var(--soft);margin-top:14px}.good{background:var(--good)}.bad{background:var(--warn)}.field{display:grid;gap:5px}.field input,.field textarea,.field select,select,textarea{border:1px solid var(--line);border-radius:10px;padding:10px;background:var(--card);color:var(--ink)}textarea{width:100%;min-height:105px}.check{display:flex;gap:9px;align-items:flex-start;padding:8px 0}.check input{width:20px;height:20px;accent-color:var(--accent)}.excerpt{white-space:pre-wrap;border-left:3px solid var(--accent);padding:10px 12px;background:var(--soft);border-radius:0 8px 8px 0}.progress{height:8px;background:var(--line);border-radius:8px;overflow:hidden}.progress span{display:block;height:100%;background:var(--accent)}footer{padding:24px 0 34px;color:var(--muted);font-size:.85rem}.count{font-variant-numeric:tabular-nums}.filters{display:flex;gap:8px;flex-wrap:wrap}.filters input,.filters select{min-height:44px}.hidden{display:none!important}@media(max-width:560px){.card,.panel>article,.panel>.card{padding:16px}.top{padding-top:17px}.top h1{font-size:1.5rem}.tabs button{padding-inline:12px}}@media(orientation:landscape) and (max-height:500px){.top{padding-top:8px}.intro{padding:12px}.tabs{padding-bottom:8px}}
article,blockquote,.small,.question{overflow-wrap:anywhere}select{max-width:100%;min-height:44px}summary,.check{min-height:44px}summary{cursor:pointer;padding:10px 0}.row>*{min-width:0}button{max-width:100%}
/* Aurora: restrained light, generous type and quiet feedback. */
:root{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",sans-serif;--bg:#f2f5fc;--card:#fff;--ink:#17223d;--muted:#52617b;--line:#d1daea;--accent:#305fd9;--soft:#e9effe;--warn:#fff4dd;--good:#e8f6ef;--shadow:0 16px 50px #293a6910}
body.dark{color-scheme:dark;--bg:#0b1020;--card:#141c30;--ink:#f3f5ff;--muted:#a7b4ce;--line:#33415f;--accent:#a8bcff;--soft:#202e50;--warn:#382e23;--good:#192d2a;--shadow:0 24px 70px #02061444}
body{min-height:100vh;background:radial-gradient(ellipse at 0 0,#5374f514,transparent 48%),var(--bg);font-size:16px;line-height:1.55}body.dark{background:radial-gradient(ellipse at 2% 0,#5279ed25,transparent 42%),radial-gradient(ellipse at 100% 30%,#9474cf15,transparent 42%),var(--bg)}
.top,main,footer{width:min(1040px,100% - 48px)}.top{padding:32px 0 24px;border-bottom:1px solid var(--line);gap:20px}.top h1{font-size:clamp(1.3rem,3.6vw,1.9rem);font-weight:650;letter-spacing:-.055em}.brand-dot{color:var(--accent);padding-left:3px}.eyebrow{font-size:.68rem;letter-spacing:.16em;font-weight:600}.top .eyebrow{margin-bottom:4px}.quiet{font-size:.8rem;font-weight:500;background:transparent}.intro{padding:44px 0 30px;margin:0;position:relative}.intro h2{font-size:clamp(2.1rem,5.7vw,3.8rem);line-height:1.12;letter-spacing:-.055em;font-weight:600;margin:20px 0}.intro h2 span{color:var(--muted)}.intro>p:not(.eyebrow){color:var(--muted)}.hero-line{height:2px;width:92px;background:linear-gradient(90deg,var(--accent),transparent);margin-top:30px}
body:not([data-view="library"]) .intro{display:none}.tabs{padding:18px 0 22px;gap:6px}.tabs button{border-color:transparent;background:transparent;font-size:.9rem;font-weight:550;color:var(--muted);border-radius:9px}.tabs button.active{color:var(--ink);background:var(--soft);border-color:var(--line)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:24px 0;margin-bottom:30px}.stats>div{display:grid;gap:4px}.stats strong{font-weight:500;font-size:1.7rem;letter-spacing:-.04em}.stats span{color:var(--muted);font-size:.79rem}.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:36px}.mode-grid button{display:grid;text-align:left;gap:16px;padding:20px;background:var(--card);border-radius:16px;font-weight:400;align-content:start}.mode-grid strong{font-size:1.1rem;font-weight:600}.mode-grid span{font-size:.8rem;color:var(--muted);line-height:1.55}.mode-grid button:first-child{border-color:var(--accent);background:linear-gradient(125deg,var(--soft),var(--card))}.mode-grid button:hover{transform:translateY(-2px)}
.panel{padding-bottom:25px}.panel>h2{font-weight:550;font-size:1.45rem;letter-spacing:-.03em}.card,.panel>article,.panel>.card{border-radius:24px;padding:30px;box-shadow:var(--shadow)}.stack{gap:18px}.panel>.card{max-width:760px;margin:24px auto}.question{font-size:clamp(1.3rem,2.5vw,1.55rem);line-height:1.5;font-weight:600;letter-spacing:-.018em;margin:9px 0 14px}.card>.eyebrow{margin:12px 0 -10px;color:var(--muted);letter-spacing:.08em;line-height:1.6}.option{padding:17px 18px;gap:14px;align-items:center;border-radius:13px;font-size:1.05rem;background:transparent;transition:border-color .15s,background .15s;text-align:left;font-weight:400;width:100%}.option input{width:19px;height:19px;flex:0 0 19px;margin:1px 0;accent-color:var(--accent)}.option:has(input:checked){background:var(--soft)}.option.correct-option{border-color:#459d75;background:transparent}.option.wrong-option{border-color:#d67176;background:transparent}.panel>button.option{font-size:.98rem;margin:8px 0;padding:15px 18px}.panel>button.primary{margin:5px 0 18px}
button{font-weight:550;border-radius:10px;transition:border-color .15s,background .15s;line-height:1.4}button.primary{color:#fff;background:#365fd1;border-color:#6384e1}.dark button.primary{color:#101a36;background:#adc0ff;border-color:#adc0ff}.pill{background:transparent;border:1px solid var(--line);color:var(--muted);font-size:.74rem;padding:5px 10px}.filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;background:var(--card);border:1px solid var(--line);padding:14px;border-radius:15px}.filters input{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px;color:var(--ink);width:100%;min-width:0}.filters select{width:100%;font-size:.83rem;background:var(--bg)}.small,.muted{font-size:.82rem;line-height:1.65}.feedback{background:transparent;border:1px solid var(--line);border-left:3px solid var(--accent);margin-top:0;line-height:1.7}.feedback.good{border-left-color:#54ba8a}.feedback.bad{border-left-color:#d67176}.source-panel{border-top:1px solid var(--line);padding-top:10px}.source-panel summary{font-weight:550;font-size:.91rem}.source-panel>details{border-top:1px solid var(--line);margin-top:15px}.source-panel p{font-size:.98rem;line-height:1.7}.source-panel .small{font-size:.8rem}.source-panel .arabic-help{padding:18px;background:var(--soft);border-radius:12px;line-height:1.9}.source-panel .excerpt{font-size:.85rem;max-height:340px;overflow:auto;line-height:1.6}.source-image{display:block;max-width:100%;height:auto;border-radius:10px;background:#fff}.rationale{font-weight:500}.pack{background:var(--card);padding:23px;border-radius:17px}.pack h3{font-weight:550;letter-spacing:-.02em}.pack>p.small{margin:8px 0}.pack>details{border-top:1px solid var(--line);padding-top:8px}.progress{height:4px}.progress span{background:var(--accent)}textarea{min-height:180px;padding:18px;line-height:1.7;background:var(--bg)}footer{border-top:1px solid var(--line);margin-top:25px;padding-top:24px;font-size:.75rem;line-height:1.8}
body.focus-mode .intro,body.focus-mode footer,body.focus-mode .filters,body.focus-mode .panel>h2,body.focus-mode .panel>p{display:none}body.focus-mode .top{padding:14px 0}body.focus-mode .top .eyebrow{display:none}body.focus-mode .top h1{font-size:1.25rem}body.focus-mode .tabs{padding-bottom:0}body.focus-mode .panel>.card{margin-top:20px}
:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.source-panel summary:focus-visible{outline-offset:0}[hidden]{display:none!important}select,input,button,textarea{min-height:46px}input[type=radio],input[type=checkbox]{min-height:0}button:disabled{transform:none}.check{align-items:center;min-height:44px}.check input{flex-shrink:0}
@media(max-width:760px){.mode-grid{grid-template-columns:repeat(2,1fr)}.top,main,footer{width:calc(100% - 32px)}.card,.panel>article,.panel>.card{padding:23px}.top{padding-top:22px}.filters{grid-template-columns:repeat(2,minmax(0,1fr))}.stats{gap:9px}.stats strong{font-size:1.4rem}.stats span{font-size:.72rem}.top .row{gap:5px}.quiet{padding:9px 10px}.intro{padding-top:28px}.tabs button{padding-inline:12px}}
@media(max-width:420px){.top{align-items:flex-start}.top .row{flex-direction:column;gap:0}.top .quiet{min-height:36px;padding:5px 9px}.top h1{font-size:1.3rem}.eyebrow{font-size:.62rem}.option{padding:15px 13px;font-size:1rem}.card,.panel>article,.panel>.card{padding:19px}.mode-grid button{padding:16px}.question{font-size:1.3rem}.stats span{font-size:.69rem}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}@media print{body{background:#fff!important;color:#111!important}.top,.tabs,.filters,footer,button{display:none!important}.card{box-shadow:none!important;border:1px solid #bbb!important}.panel{display:block!important}details{display:block!important}}

body.question-open #panel-practice>.filters,body.question-open #panel-practice>p,body.question-open #panel-practice>h2{display:none}.writing-pad .row{margin-top:12px}@media(max-width:450px){.tabs{display:grid;grid-template-columns:repeat(5,1fr);gap:2px}.tabs button{padding-inline:4px;font-size:.78rem}.panel>.card{margin-top:8px}}

.comparison-wrap{overflow:auto}.comparison-wrap table{width:100%;border-collapse:collapse;font-size:.9rem}.comparison-wrap th,.comparison-wrap td{text-align:left;border:1px solid var(--line);padding:12px;vertical-align:top}.comparison-wrap th{background:var(--soft);font-weight:600}

/* Mobile study revision: four direct modes; no dashboard. */
.top,main,footer{width:min(980px,calc(100% - 32px))}.top{padding:20px 0 16px;gap:10px}.top h1{font-size:clamp(1.1rem,4.5vw,1.7rem)}.top .row{flex-direction:row;flex-wrap:nowrap;gap:5px}.top .quiet{min-width:44px;min-height:44px;padding:8px;font-size:.78rem}.tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding:12px 0;position:sticky;top:0;z-index:5;background:var(--bg)}.tabs button{min-height:46px;padding:10px 4px;font-size:.88rem}.panel>.card{margin:10px auto 20px;padding:22px}.question{font-size:clamp(1.2rem,2.5vw,1.45rem)}.stack{gap:14px}.card>.eyebrow{margin:0}.option{min-height:56px;padding:14px 12px;gap:10px}.option-letter{font-weight:650;color:var(--muted);min-width:20px}.option input{position:absolute;opacity:0;width:1px;height:1px}.option:focus-within{outline:2px solid var(--accent);outline-offset:2px}.option:has(input:checked) .option-letter{color:var(--accent)}.card>p.small{margin:0}.card .row>select{flex:1;min-width:120px}.card .row .check{flex:1}.filters{grid-template-columns:repeat(2,minmax(0,1fr))}.filters input{grid-column:1/-1}select,textarea,input{font-size:16px}.source-references p{overflow-wrap:anywhere}footer{display:flex;justify-content:space-between;gap:16px;padding-bottom:max(24px,env(safe-area-inset-bottom));margin-top:8px}footer a{color:var(--accent);min-height:44px;display:flex;align-items:center;text-decoration:none}.top{padding-top:max(16px,env(safe-area-inset-top))}.comparison-wrap{overscroll-behavior-x:contain}.comparison-wrap table{min-width:460px}.option span:last-child{overflow-wrap:normal;word-break:normal}.question-open .card> .row.between button{font-size:.78rem;min-height:44px}.source-panel p{font-size:1rem}button,input,select,summary,a{-webkit-tap-highlight-color:transparent}textarea{-webkit-appearance:none}.top .eyebrow{font-size:.6rem}
@media(max-width:380px){.top,main,footer{width:calc(100% - 20px)}.top h1{font-size:1.05rem}.top .quiet{font-size:.7rem;padding:7px 5px}.panel>.card{padding:16px}.card>.row.between{gap:6px}.pill{font-size:.67rem}.top .row{gap:3px}.question{font-size:1.2rem}}