:root{
  --bg:#f6f5fb; --card:#fff; --ink:#1f1d2b; --muted:#6b6880; --line:#e6e3f0;
  --know:#16a34a; --again:#f59e0b; --accent:#4f46e5; --radius:18px;
  --shadow:0 6px 20px rgba(40,30,90,.08), 0 1px 3px rgba(40,30,90,.06);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
.num{white-space:nowrap;unicode-bidi:isolate;direction:ltr;display:inline-block}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans Hebrew","Rubik",Arial,sans-serif;line-height:1.55;font-size:16px}
button{font:inherit;color:inherit;cursor:pointer}
a{color:inherit}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:8px;padding:10px 14px;padding-top:max(10px,env(safe-area-inset-top));background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{flex:1;font-weight:800;text-decoration:none;font-size:17px}
.iconbtn{border:0;background:#efedf8;border-radius:12px;width:40px;height:40px;font-size:18px;display:grid;place-items:center}
main{max-width:1040px;margin:0 auto;padding:16px 14px 40px;outline:none}
.foot{text-align:center;padding:18px 14px 34px;color:var(--muted);font-size:14px}
.foot p{margin:4px 0}.muted{color:var(--muted);font-size:13px}
/* hero */
.hero{background:linear-gradient(135deg,#4f46e5,#9333ea 55%,#ec4899);color:#fff;border-radius:24px;padding:22px 18px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.hero h1{margin:0 0 4px;font-size:25px;line-height:1.25}
.hero p{margin:0;opacity:.92}
.hero .bubbles{position:absolute;inset:auto -30px -40px auto;font-size:90px;opacity:.15;transform:rotate(-12deg)}
.overall{margin-top:16px;background:rgba(255,255,255,.18);border-radius:14px;padding:10px 12px}
.overall .row{display:flex;justify-content:space-between;font-size:14px;font-weight:600}
.bar{height:10px;border-radius:99px;background:rgba(0,0,0,.08);overflow:hidden;display:flex;margin-top:6px}
.hero .bar{background:rgba(255,255,255,.25)}
.bar i{display:block;height:100%}
.bar .k{background:var(--know)} .bar .a{background:var(--again)}
.hero .bar .k{background:#fff}.hero .bar .a{background:#fde68a}
.searchbox{margin:16px 0 4px;display:flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--line);border-radius:16px;padding:4px 12px;box-shadow:var(--shadow)}
.searchbox input{flex:1;border:0;outline:0;font:inherit;padding:10px 0;background:transparent;min-width:0}
.searchbox:focus-within{border-color:var(--accent)}
h2.sect{font-size:19px;margin:22px 2px 10px}
/* chapter map */
.map{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(min-width:760px){.map{grid-template-columns:repeat(3,1fr)}}
.tile{position:relative;border:0;text-align:right;border-radius:22px;padding:16px 14px 14px;color:#fff;min-height:150px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:var(--shadow);text-decoration:none;overflow:hidden;transition:transform .15s}
.tile:active{transform:scale(.97)}
.tile .em{font-size:34px;line-height:1}
.tile h3{margin:8px 0 2px;font-size:17px;line-height:1.25}
.tile .subs{font-size:12.5px;opacity:.92}
.tile .meta{font-size:12px;opacity:.95;margin-top:8px;font-weight:600}
.tile .bar{background:rgba(255,255,255,.3);height:7px}
.tile .bar .k{background:#fff}.tile .bar .a{background:#fde68a}
.tile.studies{background:linear-gradient(135deg,#334155,#64748b)}
.how{background:#fff;border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow);margin-top:16px}
.how ul{margin:6px 0 0;padding-inline-start:20px}.how li{margin:4px 0}
/* chapter page */
.chead{border-radius:24px;padding:18px 16px;color:#fff;box-shadow:var(--shadow)}
.chead h1{margin:0;font-size:23px;line-height:1.25}
.chead .stats{display:flex;gap:12px;flex-wrap:wrap;font-size:13.5px;margin-top:6px;opacity:.95}
.chead .bar{background:rgba(255,255,255,.3)}.chead .bar .k{background:#fff}.chead .bar .a{background:#fde68a}
.tabs{position:sticky;top:61px;z-index:10;display:flex;gap:6px;overflow-x:auto;margin:12px -14px 8px;padding:8px 14px;background:var(--bg);scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{flex:1 0 auto;text-align:center;border:0;background:#fff;border-radius:99px;padding:9px 12px;font-weight:700;font-size:14.5px;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.tab[aria-selected=true]{background:var(--c,var(--accent));color:#fff}
.chips{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 10px}
.chip{border:1.5px solid var(--line);background:#fff;border-radius:99px;padding:6px 12px;font-size:13.5px;font-weight:600}
.chip[aria-pressed=true]{border-color:var(--c,var(--accent));background:var(--c,var(--accent));color:#fff}
.primary{border:0;background:var(--c,var(--accent));color:#fff;border-radius:14px;padding:12px 18px;font-weight:800;font-size:16px;box-shadow:var(--shadow)}
.ghost{border:1.5px solid var(--line);background:#fff;border-radius:14px;padding:10px 16px;font-weight:700}
.sechead{display:flex;align-items:baseline;gap:8px;margin:22px 2px 8px;flex-wrap:wrap}
.sechead h2{margin:0;font-size:20px}
.vol{font-size:12.5px;color:var(--muted);font-weight:600}
.topic{background:#fff;border-radius:var(--radius);padding:14px;margin:12px 0;box-shadow:var(--shadow);border-top:5px solid var(--c)}
.topic h3{margin:0 0 6px;font-size:16.5px}
.qbox{background:color-mix(in srgb,var(--c) 9%,#fff);border-radius:12px;padding:8px 12px;margin:6px 0;font-size:14.5px}
.qbox b{display:block;font-size:12px;color:var(--muted);font-weight:700;margin-bottom:2px}
.qbox ul{margin:0;padding-inline-start:18px}
.pg{display:inline-block;background:#f1effa;border-radius:8px;padding:2px 8px;font-size:12.5px;font-weight:700;color:#4b4670;margin:2px 0}
.note{font-size:14px;color:#3d3a52;margin:6px 0}
.tablebtns{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.grid{display:grid;grid-template-columns:1fr;gap:12px;margin-top:10px}
@media(min-width:640px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:960px){.grid{grid-template-columns:repeat(3,1fr)}}
/* flip card */
.fc{display:flex;flex-direction:column;gap:6px}
.flip{perspective:1200px;border:0;padding:0;background:none;text-align:right;width:100%}
.flip .in{display:grid;transition:transform .5s cubic-bezier(.2,.7,.2,1);transform-style:preserve-3d}
.flip.on .in{transform:rotateY(180deg)}
.face{grid-area:1/1;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:16px;padding:14px;min-height:150px;box-shadow:var(--shadow);background:#fff;display:flex;flex-direction:column}
.front{background:linear-gradient(160deg,color-mix(in srgb,var(--c) 92%,#fff),color-mix(in srgb,var(--c) 70%,#000 0%));color:#fff;justify-content:center;align-items:center;text-align:center}
.front .t{font-size:20px;font-weight:800;line-height:1.3}
.front .lab{font-size:12px;opacity:.9;margin-top:8px}
.front .hint{position:absolute;bottom:8px;left:12px;font-size:11.5px;opacity:.8}
.front{position:relative}
.front .badge{position:absolute;top:8px;left:10px;font-size:16px}
.back{transform:rotateY(180deg);border:2px solid color-mix(in srgb,var(--c) 40%,#fff);font-size:14.5px}
.back .bt{font-weight:800;font-size:15px;color:color-mix(in srgb,var(--c) 75%,#000);margin-bottom:4px}
.back .def{margin:0 0 8px}
.back .kv{margin:3px 0}.back .kv b{color:#4b4670}
.back .meta{margin-top:auto;padding-top:8px;border-top:1px dashed var(--line);font-size:12.5px;color:var(--muted)}
.back .meta div{margin:2px 0}
.nodef{background:#fff7e6;border-radius:10px;padding:6px 10px;font-size:13.5px;color:#7a5200;margin:0 0 8px}
.marks{display:flex;gap:6px}
.mk{flex:1;border:1.5px solid var(--line);background:#fff;border-radius:12px;padding:8px 6px;font-weight:700;font-size:14px}
.mk.know[aria-pressed=true]{background:var(--know);border-color:var(--know);color:#fff}
.mk.again[aria-pressed=true]{background:var(--again);border-color:var(--again);color:#fff}
/* study */
.study{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);margin:12px 0;border-inline-start:6px solid var(--c);overflow:hidden}
.study summary{list-style:none;padding:14px;cursor:pointer;font-weight:800;display:flex;gap:8px;align-items:flex-start}
.study summary::-webkit-details-marker{display:none}
.study summary .ar{margin-inline-start:auto;transition:transform .2s;color:var(--muted)}
.study[open] summary .ar{transform:rotate(-90deg)}
.study .body{padding:0 14px 14px}
.blk{margin:10px 0}
.blk .l{display:inline-block;background:var(--c);color:#fff;border-radius:8px;padding:1px 9px;font-size:12.5px;font-weight:800;margin-bottom:4px}
.blk p{margin:4px 0}
.blk ul{margin:4px 0;padding-inline-start:18px}
.tip{background:#eef2ff;border-radius:14px;padding:10px 14px;font-size:14.5px;margin:10px 0}
/* quiz */
.quiz{background:#fff;border-radius:22px;box-shadow:var(--shadow);padding:18px 16px;margin-top:8px}
.qprog{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);font-weight:700}
.qtype{display:inline-block;font-size:12px;font-weight:800;color:var(--c);margin-top:8px}
.qtext{font-size:18px;font-weight:800;margin:6px 0 12px;line-height:1.45}
.qtext .quote{display:block;font-weight:500;font-size:16px;background:#f7f6fc;border-radius:12px;padding:10px 12px;margin-top:8px}
.opts{display:grid;gap:8px}
.opt{border:2px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;text-align:right;font-weight:600;font-size:15.5px}
.opt.right{border-color:var(--know);background:#ecfdf3}
.opt.wrong{border-color:#ef4444;background:#fef2f2}
.opt:disabled{cursor:default;color:var(--ink)}
.fb{margin-top:12px;border-radius:14px;padding:10px 14px;font-size:14.5px}
.fb.ok{background:#ecfdf3}.fb.no{background:#fef2f2}
.fb b{font-size:16px}
.qnav{display:flex;justify-content:flex-start;margin-top:14px;gap:8px}
.score{text-align:center;padding:10px 0}
.score .big{font-size:54px}
.score h2{margin:6px 0}
/* exam */
.exam{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;margin:12px 0}
.exam .top{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-bottom:6px}
.yr{background:var(--c);color:#fff;border-radius:8px;padding:1px 9px;font-size:12.5px;font-weight:800}
.secl{font-size:12.5px;color:var(--muted);font-weight:700}
.exam .scen{margin:4px 0;font-size:15px;color:#33304a}
.exam .task{margin:8px 0 4px;font-weight:700;font-size:15.5px}
.exam .acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.rel{margin-top:10px;background:#f7f6fc;border-radius:12px;padding:10px 12px}
.rel h4{margin:0 0 6px;font-size:13.5px;color:var(--muted)}
.rel .ri{display:flex;justify-content:space-between;gap:8px;align-items:center;width:100%;border:0;background:#fff;border-radius:10px;padding:8px 10px;margin:5px 0;text-align:right;font-weight:700;box-shadow:0 1px 2px rgba(0,0,0,.06)}
.done{border-color:var(--know)!important;color:var(--know)}
/* overlay */
.overlay{position:fixed;inset:0;z-index:50;background:rgba(20,16,40,.55);display:flex;align-items:flex-start;justify-content:center;padding:max(12px,env(safe-area-inset-top)) 12px 12px;overflow-y:auto}
.overlay[hidden]{display:none}
.sheet{background:var(--bg);border-radius:22px;width:100%;max-width:640px;padding:14px;box-shadow:0 20px 50px rgba(0,0,0,.3);margin:auto 0}
.sheet .x{float:left}
.sheet h3{margin:4px 0 10px}
.res{display:block;width:100%;text-align:right;border:0;background:#fff;border-radius:14px;padding:10px 12px;margin:6px 0;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.res .rt{font-weight:800}
.res .rs{font-size:13px;color:var(--muted);display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-inline-end:6px}
.empty{color:var(--muted);text-align:center;padding:20px}
table.sum{border-collapse:collapse;width:100%;font-size:13.5px;background:#fff}
table.sum th,table.sum td{border:1px solid var(--line);padding:6px 8px;vertical-align:top;text-align:right}
table.sum th{background:#f1effa}
.tscroll{overflow-x:auto;border-radius:12px}
.stagecards .sc{background:#fff;border-radius:14px;padding:10px 12px;margin:8px 0;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.stagecards .sc h4{margin:0 0 4px}
.practice{max-width:520px;margin:0 auto}
.practice .flip .face{min-height:260px}
.practice .front .t{font-size:24px}
.pnav{display:flex;justify-content:space-between;align-items:center;margin:10px 0;font-weight:700;color:var(--muted)}
@media (prefers-reduced-motion:reduce){.flip .in{transition:none}}

@media(max-width:420px){.tab{padding:8px 9px;font-size:13.5px}.tabs{gap:5px}}

.brand{display:inline-flex;align-items:center;gap:8px}.brand-logo{height:34px;width:auto;border-radius:6px;background:#fff;padding:2px}
.booklet{display:inline-block;padding:10px 18px;border-radius:999px;background:#4f46e5;color:#fff!important;text-decoration:none;font-weight:700;margin:6px 0}

/* v2: studies block + resources */
@media(max-width:759px){.map .tile:last-child:nth-child(odd){grid-column:1/-1;min-height:120px}}
.studyblock{display:block;margin-top:16px;border-radius:24px;padding:18px 16px 16px;color:#fff;text-decoration:none;background:linear-gradient(135deg,#0f172a,#334155 60%,#475569);box-shadow:var(--shadow);border:2px dashed rgba(255,255,255,.35);outline:3px solid #0f172a;outline-offset:-1px;position:relative;transition:transform .15s}
.studyblock:active{transform:scale(.98)}
.studyblock .sbt{display:flex;gap:12px;align-items:flex-start}
.studyblock .sbe{font-size:38px;line-height:1}
.studyblock h3{margin:0 0 4px;font-size:20px}
.studyblock p{margin:0;font-size:14px;opacity:.92}
.studyblock .sbchips{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.studyblock .sbchips span{background:rgba(255,255,255,.14);border-radius:999px;padding:4px 10px;font-size:12.5px}
.studyblock .sbgo{display:inline-block;margin-top:12px;background:#fff;color:#0f172a;font-weight:800;border-radius:999px;padding:8px 16px;font-size:14px}
.resgrid{display:grid;grid-template-columns:1fr;gap:10px}
@media(min-width:640px){.resgrid{grid-template-columns:repeat(2,1fr)}}
.rescard{display:flex;align-items:center;gap:12px;background:#fff;border-radius:16px;padding:12px 14px;box-shadow:var(--shadow);text-decoration:none;color:var(--ink);border:1.5px solid var(--line)}
.rescard.hi{border-color:#a5b4fc;background:linear-gradient(135deg,#eef2ff,#fff)}
.rescard .re{font-size:26px}
.rescard .rt2{flex:1;display:flex;flex-direction:column}
.rescard small{color:var(--muted);font-size:12.5px}
.rescard .ra{color:var(--accent);font-weight:800}
.resch{background:#fff;border-radius:16px;padding:10px 14px;margin-top:10px;box-shadow:var(--shadow)}
.resch summary{cursor:pointer;font-weight:700}
.rcrow{margin-top:10px}
.chips2{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.rchip{display:inline-block;background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:6px 12px;font-size:13.5px;text-decoration:none;color:var(--ink);font-weight:600}
.chres{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:10px}
.chres .lbl{font-weight:700;font-size:13.5px;color:var(--muted)}
.genl{text-align:center;margin:12px 0 0}
.genl a{color:var(--accent);font-weight:700}
.jump{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 4px}
.jump a{border:1.5px solid;border-radius:999px;padding:5px 11px;font-size:13.5px;text-decoration:none;font-weight:700;background:#fff}

.intro{position:fixed;inset:0;z-index:60;background:linear-gradient(160deg,#4f46e5ee,#9333eaee);display:flex;align-items:flex-start;justify-content:center;padding:max(16px,env(safe-area-inset-top)) 14px 16px;overflow-y:auto}
.intro[hidden]{display:none}
.intro-card{background:#fff;border-radius:22px;max-width:520px;width:100%;padding:22px 20px;box-shadow:0 20px 50px rgba(0,0,0,.25);text-align:center;margin:auto 0}
.intro-logo{height:56px;width:auto;margin-bottom:6px}
.intro-card h1{font-size:1.35rem;margin:6px 0 4px;color:#312e81}
.intro-sub{color:#555;margin:0 0 12px}
.intro-list{list-style:none;padding:0;margin:0 0 10px;text-align:right}
.intro-list li{padding:8px 10px;margin:6px 0;background:#f5f3ff;border-radius:12px;line-height:1.45;font-size:.95rem}
.intro-tip{font-size:.85rem;color:#666;margin:8px 0 14px}
.intro-go{border:0;border-radius:999px;padding:13px 28px;font-size:1.05rem;font-weight:700;color:#fff;background:linear-gradient(90deg,#4f46e5,#9333ea);cursor:pointer}

/* question-word highlighting */
mark.qw{background:linear-gradient(transparent 12%,var(--qc) 12%,var(--qc) 88%,transparent 88%);color:inherit;border-radius:4px;padding:0 2px;cursor:pointer;-webkit-tap-highlight-color:transparent;box-decoration-break:clone;-webkit-box-decoration-break:clone;border-bottom:2px dotted rgba(0,0,0,.35)}
mark.qw:hover,mark.qw.act{outline:2px solid rgba(31,29,43,.55);outline-offset:1px}
mark.qw:focus-visible{outline:2px solid var(--accent)}
.qpop{position:absolute;z-index:60;background:#fff;border-radius:16px;box-shadow:0 14px 40px rgba(20,16,40,.28);border-top:6px solid var(--qc);padding:12px 14px 10px;font-size:14.5px;line-height:1.55;color:var(--ink)}
.qpop p{margin:6px 0 8px}
.qpop .qh{display:flex;gap:8px;align-items:center;flex-wrap:wrap;padding-left:26px}
.qpop .qtag{background:var(--qc);border-radius:6px;padding:1px 8px;font-weight:800}
.qpop .qt{font-weight:700;color:var(--muted);font-size:13.5px}
.qpop .qx{position:absolute;top:8px;left:8px;border:0;background:#f1f0f7;border-radius:50%;width:28px;height:28px;font-size:14px;line-height:28px;padding:0;cursor:pointer}
.qpop .qf{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:6px}
.qpop .qf a{font-weight:700;color:var(--accent);text-decoration:none}
.qwbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:8px 0 6px}
.qtog{display:inline-flex;align-items:center;gap:8px;border:1.5px solid #facc15;background:#fefce8;border-radius:14px;padding:8px 12px;font-weight:700;font-size:14.5px;cursor:pointer;color:var(--ink)}
.qtog .sw{width:34px;height:20px;border-radius:20px;background:#cbd5e1;position:relative;transition:background .2s;flex:none}
.qtog .sw::after{content:"";position:absolute;top:2px;right:2px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.3);transition:right .2s}
.qtog[aria-pressed="true"] .sw{background:#16a34a}
.qtog[aria-pressed="true"] .sw::after{right:16px}
.qtog[aria-pressed="false"]{background:#fff;border-color:var(--line)}
.qdict{font-weight:700;font-size:14px;color:var(--accent);text-decoration:none;padding:8px 6px}
.qcard{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;margin:12px 0;border-right:6px solid var(--qc)}
.qcard .qch{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.qcard .qwl{background:linear-gradient(transparent 12%,var(--qc) 12%,var(--qc) 88%,transparent 88%);font-weight:800;font-size:18px;padding:0 4px;color:var(--ink)}
.qcard .qn{font-size:12.5px;color:var(--muted)}
.qcard .qforms{font-size:13px;color:var(--muted);margin:4px 0}
.qcard p{margin:6px 0 0;line-height:1.6}

.pg-ov{position:fixed;inset:0;z-index:55;background:rgba(20,16,40,.55);display:flex;justify-content:center;align-items:flex-start;padding:max(12px,env(safe-area-inset-top)) 10px 12px;overflow-y:auto}
.pg-ov[hidden]{display:none}
.pg-card{background:#fff;border-radius:18px;max-width:640px;width:100%;padding:18px 14px;position:relative;box-shadow:0 16px 40px rgba(0,0,0,.25)}
.pg-card h2{margin:0 0 8px;font-size:1.25rem;color:#312e81}
.pg-card h3{margin:16px 0 6px;font-size:1.05rem}
.pg-vol{font-size:.8rem;color:#666;font-weight:400}
.pg-x{position:absolute;top:10px;left:10px;border:0;background:#eee;border-radius:50%;width:32px;height:32px;font-size:16px;cursor:pointer}
.pg-t{width:100%;border-collapse:collapse;font-size:.92rem}
.pg-t th{background:#ede9fe;text-align:right;padding:6px 8px}
.pg-t td{border-bottom:1px solid #eee;padding:6px 8px;vertical-align:top;line-height:1.4}
.pg-row td{background:#f8f7ff;font-weight:700}
.pg-rp{font-weight:400;color:#666;font-size:.85rem}
.pg-p{white-space:nowrap;font-weight:600;color:#4338ca;width:1%}