[hidden]{display:none!important}
:root{--bg:#eef4f5;--card:#fff;--text:#132a31;--muted:#687b82;--line:#d7e3e6;--brand:#155e6c;--brand2:#2b7a89;--accent:#e99b22;--good:#15803d;--bad:#c73b3b;--soft:#e8f4f6;--shadow:0 10px 28px rgba(16,54,63,.10);--qsize:1.08rem;--osize:.98rem}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{margin:0;background:linear-gradient(180deg,#e8f2f3,#f7fafb 45%);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI",Arial,sans-serif;min-height:100vh}button,a{font:inherit}button{cursor:pointer}#app{width:min(900px,100%);margin:auto;padding:calc(8px + env(safe-area-inset-top)) 10px calc(22px + env(safe-area-inset-bottom))}.app-header{display:flex;align-items:center;gap:10px;background:var(--card);padding:10px 12px;border-radius:17px;box-shadow:var(--shadow);position:sticky;top:calc(4px + env(safe-area-inset-top));z-index:20}.brand-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,#ffe189,#f2a825);font-size:1.4rem}.brand-copy{flex:1;min-width:0}.brand-copy h1{font-size:1.13rem;margin:0;line-height:1.2}.brand-copy p{font-size:.76rem;color:var(--muted);margin:3px 0 0}.icon-btn{border:1px solid var(--line);background:var(--card);width:38px;height:38px;border-radius:11px;font-size:1rem}.dashboard{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:11px 0}.stat-card{border:1px solid var(--line);background:var(--card);border-radius:14px;padding:10px 6px;box-shadow:0 4px 12px rgba(16,54,63,.05);color:var(--text)}.stat-card b{display:block;color:var(--brand);font-size:1.05rem}.stat-card span{font-size:.68rem;color:var(--muted)}.quiz-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow);position:relative;overflow:hidden}.quiz-card:before{content:"";position:absolute;inset:0 0 auto;height:4px;background:linear-gradient(90deg,var(--brand),var(--accent))}.session-bar{display:flex;align-items:center;justify-content:space-between;background:var(--soft);border-radius:11px;padding:7px 9px;margin:1px 0 8px}.session-bar div{display:flex;gap:7px;align-items:center}.session-bar span{font-size:.75rem;color:var(--muted)}.session-bar button{border:0;background:#fff;border-radius:8px;padding:5px 8px}.quiz-topbar{display:flex;align-items:center;justify-content:space-between;gap:8px}.pill{border:1px solid #acd0d6;background:#f1fafb;padding:5px 10px;border-radius:10px;font-weight:800;font-size:.78rem;color:var(--brand)}.pill.score{color:var(--good);border-color:#b8dabe}.favorite{width:36px;height:36px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:1.35rem;color:#75858b}.favorite.active{color:#e39b16;background:#fff8e7}.progress-track{height:5px;background:#e7eef0;border-radius:5px;margin:8px 0}.progress-track span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand2),var(--accent));border-radius:inherit;transition:width .25s}.question-meta{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}.question-meta span{background:#f2f6f7;border:1px solid var(--line);border-radius:9px;padding:4px 8px;font-size:.72rem;color:#50636a}.question-meta span:first-child{background:#e9f5f7;color:var(--brand);font-weight:800}.source-issue,.visual-notice{padding:9px 10px;border-radius:11px;margin:7px 0;font-size:.82rem;line-height:1.45}.source-issue{background:#fff2e4;border:1px solid #f0c38e;color:#814a10}.visual-notice{background:#edf4ff;border:1px solid #bfd2ef;color:#31527e}.question-visual{display:block;width:100%;max-height:440px;object-fit:contain;background:#fff;border:1px solid var(--line);border-radius:12px;margin:8px auto}.question-text{font-size:var(--qsize);line-height:1.52;margin:8px 2px 12px;font-weight:820;text-align:right}.options{display:grid;gap:8px}.option{width:100%;display:flex;align-items:flex-start;gap:10px;border:1px solid #cbdadd;background:#fff;padding:11px;border-radius:12px;color:var(--text);text-align:right;font-size:var(--osize);line-height:1.48}.option .letter{display:grid;place-items:center;flex:0 0 32px;width:32px;height:32px;border:1px solid #89b7c0;border-radius:9px;background:#f0f8f9;font-weight:900;color:var(--brand)}.option:hover{border-color:#77aeb9}.option.selected{border-width:2px}.option.correct{border-color:#48a866;background:#eefaf1}.option.wrong{border-color:#db6666;background:#fff1f1}.option:disabled{cursor:default;opacity:1}.feedback{padding:9px 10px;margin-top:8px;border-radius:10px;font-size:.83rem;line-height:1.45}.feedback.good{background:#edf9f0;color:#176435}.feedback.bad{background:#fff0f0;color:#8e2626}.feedback.neutral{background:#f2f5f6;color:#4b6169}.nav-row{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:11px}.nav-btn{min-height:44px;border-radius:11px;font-weight:850;border:1px solid var(--line)}.nav-btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}.nav-btn.secondary{background:#f4f6f7;color:#66777d}.nav-btn:disabled{opacity:.45}footer{text-align:center;color:#839399;font-size:.68rem;line-height:1.5;margin:14px 8px}.overlay{position:fixed;inset:0;background:rgba(4,22,28,.48);z-index:80}.drawer{position:fixed;z-index:90;top:0;right:0;width:min(360px,88vw);height:100dvh;background:var(--card);padding:calc(14px + env(safe-area-inset-top)) 14px calc(16px + env(safe-area-inset-bottom));transform:translateX(105%);transition:transform .22s;box-shadow:-18px 0 40px rgba(0,0,0,.18);overflow:auto}.drawer.open{transform:translateX(0)}.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:13px}.drawer-head b{font-size:1.1rem}.drawer-head button{border:0;background:#eef3f4;width:38px;height:38px;border-radius:10px;font-size:1.5rem}.drawer-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.drawer-grid button,.drawer-grid a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;min-height:80px;border:1px solid var(--line);background:#f8fbfb;border-radius:13px;color:var(--text);text-decoration:none;font-size:.82rem;font-weight:750}.drawer-grid span{font-size:1.3rem}.reading-block{margin-top:17px;border-top:1px solid var(--line);padding-top:13px}.font-controls{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-top:8px}.font-controls button{border:1px solid var(--line);background:#f5f8f9;padding:8px 4px;border-radius:9px;font-size:.76rem}.font-controls button.active{background:var(--brand);color:#fff;border-color:var(--brand)}.panel{position:fixed;z-index:70;inset:0;background:var(--bg);overflow:auto;padding:calc(12px + env(safe-area-inset-top)) 12px calc(20px + env(safe-area-inset-bottom))}.panel-head{display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;background:var(--bg);padding:4px 0 10px;z-index:3}.panel-head button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 11px}.panel-head b{font-size:1.02rem}.search-input{width:100%;border:1px solid var(--line);background:#fff;padding:11px;border-radius:11px;font-size:1rem;margin-bottom:9px}.filter-row{display:flex;gap:6px;overflow:auto;padding-bottom:8px}.filter-row button{white-space:nowrap;border:1px solid var(--line);background:#fff;padding:7px 10px;border-radius:10px;font-size:.78rem}.filter-row button.active{background:var(--brand);color:#fff}.index-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}.index-cell{position:relative;border:1px solid var(--line);background:#fff;border-radius:9px;min-height:39px;font-weight:800;color:#53666d}.index-cell.answered{background:#eaf8ee;color:#277242}.index-cell.wrong{background:#fff0f0;color:#a73535}.index-cell.favorite:after{content:"★";position:absolute;top:1px;left:3px;color:#e1a01a;font-size:.58rem}.index-cell.issue:before{content:"!";position:absolute;top:1px;right:4px;color:#d46a16;font-size:.62rem}.result-list{display:grid;gap:8px}.result-item{display:flex;align-items:center;gap:9px;width:100%;text-align:right;border:1px solid var(--line);background:#fff;border-radius:11px;padding:9px}.result-item b{flex:0 0 38px;color:var(--brand)}.result-item span{font-size:.82rem;line-height:1.35}.toast{position:fixed;z-index:120;left:50%;bottom:calc(18px + env(safe-area-inset-bottom));transform:translate(-50%,25px);background:#173b43;color:#fff;border-radius:999px;padding:9px 15px;font-size:.82rem;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}body.dark{--bg:#10242a;--card:#173038;--text:#eff8fa;--muted:#a9bec4;--line:#34505a;--soft:#1f414a;background:#0f242a}.dark .option,.dark .pill,.dark .icon-btn,.dark .stat-card,.dark .drawer-grid button,.dark .drawer-grid a,.dark .index-cell,.dark .result-item,.dark .search-input,.dark .filter-row button{background:#18343c;color:var(--text)}.dark .option .letter{background:#234851}.dark .nav-btn.secondary{background:#243b42;color:#d1dfe2}.dark .source-issue{background:#4a321c;color:#ffd6a8}.dark .visual-notice{background:#203a55;color:#c6ddff}
body.font-large{--qsize:1.22rem;--osize:1.08rem}body.font-xl{--qsize:1.36rem;--osize:1.18rem}
@media(max-width:620px){#app{padding-left:7px;padding-right:7px}.app-header{padding:8px}.brand-icon{width:38px;height:38px}.brand-copy h1{font-size:1rem}.brand-copy p{display:none}.dashboard{gap:6px}.stat-card{padding:8px 3px}.stat-card span{font-size:.61rem}.quiz-card{padding:10px 9px}.question-text{line-height:1.46}.option{padding:9px 8px}.index-grid{grid-template-columns:repeat(6,1fr)}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

.loading-state{min-height:55vh;display:grid;place-content:center;text-align:center;gap:8px;color:var(--muted)}.loading-state b{font-size:1.15rem;color:var(--text)}.loading-state span{font-size:.9rem}


/* V4 stability */
html{scroll-behavior:auto!important}
.quiz-card,.options,.option{touch-action:pan-y}
.nav-btn{touch-action:manipulation}
body.menu-open{overflow:hidden}
.progress-track span{transition:none}
.question-visual{content-visibility:auto}


/* V4.1 — Theory explanations */
.theory-note-btn{width:36px;height:36px;border:1px solid #b7d5da;border-radius:10px;background:#eef8f9;font-size:1.05rem;color:var(--brand);display:grid;place-items:center;touch-action:manipulation}
.theory-note-btn.has-source{background:#fff5d9;border-color:#e8bd55;box-shadow:0 0 0 2px rgba(232,189,85,.14)}
.theory-note-btn.basic{filter:saturate(.72)}
.theory-note-overlay{position:fixed;z-index:140;inset:0;background:rgba(5,24,30,.58);padding:calc(12px + env(safe-area-inset-top)) 10px calc(12px + env(safe-area-inset-bottom));overflow:auto;display:grid;align-items:end}
.theory-note-modal{width:min(640px,100%);max-height:min(82dvh,760px);margin:0 auto;background:var(--card);color:var(--text);border:1px solid var(--line);border-radius:20px 20px 14px 14px;box-shadow:0 24px 70px rgba(0,0,0,.28);overflow:hidden;display:flex;flex-direction:column}
.theory-note-head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line);background:linear-gradient(135deg,#edf8f9,#fff8e9);flex:0 0 auto}
.theory-note-head b{font-size:1rem}.theory-note-head button{width:38px;height:38px;border:0;border-radius:11px;background:#fff;color:#31515a;font-size:1.5rem;line-height:1}
.theory-note-content{padding:12px;overflow:auto;overscroll-behavior:contain}.theory-note-badges{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:9px}.theory-note-badges span{padding:4px 8px;border-radius:999px;border:1px solid var(--line);background:#f4f8f9;color:var(--muted);font-size:.7rem;font-weight:750}
.theory-note-answer{display:grid;gap:6px;padding:11px 12px;border:1px solid #9fceb0;background:#eefaf2;border-radius:13px;margin-bottom:10px}.theory-note-answer b{color:#176a39}.theory-note-answer span{font-size:.93rem;line-height:1.55;font-weight:700}.theory-note-answer.unresolved{border-color:#efbd73;background:#fff5e7}.theory-note-answer.unresolved b{color:#934f0f}.theory-note-answer.unresolved span{font-weight:500;color:#73512c}
.theory-note-section{border:1px solid var(--line);background:#fff;border-radius:13px;padding:11px 12px;margin-top:9px}.theory-note-section h3{font-size:.88rem;margin:0 0 6px;color:var(--brand)}.theory-note-section p{font-size:.86rem;line-height:1.65;margin:0;color:var(--text)}.theory-note-section.source{background:#fff9ea;border-color:#ead49a}.theory-note-section.source h3{color:#8b5b0f}.theory-note-section.source.muted{background:#f6f8f9;border-color:var(--line)}.theory-note-section.source.muted h3{color:#60747a}.theory-note-section.source.muted p{color:var(--muted)}
.theory-note-formula{direction:ltr;text-align:center;margin-top:9px;padding:9px;border-radius:10px;background:#123f48;color:#fff;font:800 .92rem/1.45 ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}.theory-note-visual{margin-top:9px;padding:9px 11px;border:1px solid #bdd3ed;background:#edf5ff;color:#315a84;border-radius:11px;font-size:.8rem}.theory-note-disclaimer{margin:11px 3px 2px;color:var(--muted);font-size:.68rem;line-height:1.55}
.dark .theory-note-head{background:linear-gradient(135deg,#1e4048,#40351d)}.dark .theory-note-head button,.dark .theory-note-section{background:#18343c}.dark .theory-note-answer{background:#173d2c}.dark .theory-note-answer span,.dark .theory-note-section p{color:var(--text)}.dark .theory-note-section.source{background:#45371d}.dark .theory-note-section.source.muted{background:#20363d}.dark .theory-note-formula{background:#0b2229}.dark .theory-note-btn{background:#1d4149;border-color:#46717b}
@media(min-width:700px){.theory-note-overlay{align-items:center}.theory-note-modal{border-radius:20px}}

/* V5.6.0: preserve mixed Hebrew/number option order */
.option .option-text{unicode-bidi:plaintext;text-align:start;min-width:0}


/* V5.0 — verified drawings and stable full-screen viewer */
.question-visual{cursor:zoom-in;touch-action:manipulation;-webkit-user-select:none;user-select:none}
.question-visual:focus-visible{outline:3px solid rgba(21,94,108,.35);outline-offset:3px}
.visual-open-hint{display:block;margin:0 auto 9px;border:0;background:transparent;color:var(--brand);font-size:.76rem;font-weight:800;padding:4px 10px;touch-action:manipulation}
.visual-viewer{position:fixed;inset:0;z-index:260;background:rgba(4,17,22,.96);color:#fff;display:grid;grid-template-rows:auto 1fr auto;padding:max(10px,env(safe-area-inset-top)) 10px max(12px,env(safe-area-inset-bottom));overscroll-behavior:contain}
.visual-viewer-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:2px 2px 10px;min-height:48px}
.visual-viewer-toolbar b{font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.visual-viewer-toolbar div{display:flex;gap:8px}
.visual-viewer-toolbar button{width:42px;height:42px;border-radius:13px;border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.11);color:#fff;font-size:1.35rem;display:grid;place-items:center;touch-action:manipulation}
.visual-viewer-stage{position:relative;min-height:0;overflow:hidden;border-radius:16px;background:#fff;display:grid;place-items:center;touch-action:none;user-select:none;-webkit-user-select:none}
.visual-viewer-stage img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;transform-origin:center center;will-change:transform;pointer-events:none;-webkit-user-drag:none}
.visual-viewer-caption{text-align:center;color:rgba(255,255,255,.76);font-size:.72rem;line-height:1.45;padding:9px 8px 0}
@media(max-height:620px){.visual-viewer-caption{display:none}.visual-viewer{grid-template-rows:auto 1fr}}
@media(prefers-reduced-motion:reduce){.visual-viewer-stage img{transition:none!important}}

/* V5.1 — stable media space and unambiguous numeric counters */
#positionLabel,#scoreLabel,#sessionProgress{direction:ltr;unicode-bidi:isolate}
.question-visual.is-loading{opacity:.12;background:linear-gradient(135deg,#f2f6f7,#fff);pointer-events:none}
.question-visual{transition:opacity .12s ease}
@media(prefers-reduced-motion:reduce){.question-visual{transition:none}}