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canvas{cursor:grab}.math-viewer-actions{top:14px;z-index:4;gap:6px;display:flex;position:absolute;inset-inline-end:14px}.math-viewer-actions button{border:1px solid var(--line);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);cursor:pointer;background:#fffbf4d1;border-radius:99px;align-items:center;gap:6px;min-height:30px;padding:0 11px;font-size:10px;display:flex}.math-viewer-actions button.active{background:var(--math-accent);color:#fff;border-color:#0000}.math-error{z-index:5;inset-inline:16px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:#9c4a41;background:#fff4f0f0;border:1px solid #b2544a57;border-radius:12px;align-items:center;gap:8px;margin:0;padding:10px 13px;font-size:11.5px;line-height:1.5;display:flex;position:absolute;bottom:16px}.math-error svg{flex:none}.math-app .view-caption{max-width:46%;bottom:16px;left:20px;right:auto}[dir=rtl] .math-app .view-caption{left:auto;right:20px}.math-app .view-caption 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b{font-family:var(--font-serif-ar), var(--font-serif), serif;font-size:13.5px}.math-formula-list small{color:var(--muted);font-size:10.5px;line-height:1.6}.m-formula{white-space:pre-wrap;unicode-bidi:isolate;flex-wrap:wrap;align-items:center;gap:0 1px;font:500 15px/1.15 DM Mono,ui-monospace,SFMono-Regular,Menlo,monospace;display:inline-flex}.m-formula.m-block{color:#6b4c1c;background:#c08a3e14;border-radius:9px;padding:8px 11px;display:flex;overflow-x:auto;box-shadow:inset 0 0 0 1px #a0723024}.m-formula sup,.m-formula sub{font-size:.68em;line-height:0}.m-formula sup{vertical-align:super}.m-formula sub{vertical-align:sub}.m-frac{vertical-align:middle;flex-direction:column;align-items:center;margin:0 3px;font-size:.94em;display:inline-flex}.m-frac-top{border-bottom:1px solid;padding:0 4px 1px}.m-frac-bottom{padding:1px 4px 0}.m-sqrt{align-items:stretch;display:inline-flex}.m-sqrt-sign{font-size:1.05em}.m-sqrt-body{border-top:1px solid;margin-top:1px;padding:0 2px}.m-number{font-variant-numeric:tabular-nums;unicode-bidi:isolate}.math-cards{grid-template-columns:1.05fr repeat(3,1fr)}.math-card-body{font:500 11.5px/1.65 var(--font-serif), serif;color:#6e655f;margin:8px 0 12px;overflow:hidden}[dir=rtl] .math-card-body{font-family:var(--font-serif-ar), var(--font-serif), serif;font-size:12.5px}.math-cards .curiosity-card p{font-size:19px}.math-param-list{flex-direction:column;flex:1;gap:8px;margin:8px 0 12px;padding:0;list-style:none;display:flex;overflow:hidden}.math-param-list li{flex-direction:column;gap:2px;display:flex}.math-param-list li:before{content:none}.math-param-list b{font:500 11.5px var(--font-serif), serif}.math-param-list span{color:var(--muted);font-size:10px;line-height:1.5}@media (max-width:1350px){.math-workspace{grid-template-columns:265px minmax(420px,1fr) 310px;height:min(700px,100vh - 170px)}.math-cards{grid-template-columns:repeat(2,1fr)}}@media (max-width:1040px){.math-app .topbar{grid-template-columns:1fr auto;row-gap:8px}.math-subject-tabs{grid-column:1/-1;justify-content:flex-start}.math-app .math-workspace{grid-template-columns:250px minmax(360px,1fr);height:auto}.math-app .math-controls,.math-app .math-viewer{height:620px}.math-app .math-info{grid-column:1/-1;height:auto;max-height:none}}@media (max-width:760px){.math-app .topbar{height:auto;padding:8px 0}.math-app .math-tool-nav{scrollbar-width:none;flex-wrap:nowrap;justify-content:flex-start;display:flex;overflow-x:auto}.math-app .math-tool-nav button{flex:none}.math-app .math-workspace{flex-direction:column;gap:10px;display:flex}.math-app .math-viewer{order:-1;height:58vh;min-height:380px}.math-app .math-controls{z-index:auto;background:var(--paper);border-radius:22px;height:auto;max-height:none;margin-top:10px;position:static;inset:auto;transform:none}.math-app .math-control-body{overflow:visible}.math-app .math-info{margin-top:10px}.math-cards{grid-template-columns:1fr}}.math-margin-note{background:repeating-linear-gradient(0deg,#0000,#0000 11px,#6078a017 11px 12px),repeating-linear-gradient(90deg,#0000,#0000 11px,#6078a017 11px 12px),#fdf8ec}.quad-open{border:1px solid var(--line);cursor:pointer;width:100%;min-height:36px;font:500 12px var(--font-serif), serif;background:#ffffff3d;border-radius:9px;align-items:center;gap:7px;margin-top:9px;padding:0 13px;display:flex}.quad-open:hover{background:#fff9}.quad-modal{width:min(640px,100vw - 32px)}.quad-hint{color:var(--muted);margin:6px 0 12px;font-size:12px;line-height:1.7}.quad-controls{flex-wrap:wrap;align-items:end;gap:10px;display:flex}.quad-field{color:var(--muted);flex-direction:column;gap:4px;font-size:11px;display:flex}.quad-field input{border:1px solid var(--line);font-variant-numeric:tabular-nums;background:#fff;border-radius:9px;width:74px;height:34px;padding:0 9px}.quad-swatches{gap:6px;margin-inline-start:auto;display:flex}.quad-swatches button{cursor:pointer;border:2px solid #0000;border-radius:50%;width:24px;height:24px}.quad-swatches button.on{border-color:var(--ink)}.quad-toggles{gap:16px;margin:10px 0 12px;font-size:12px;display:flex}.quad-toggles label{cursor:pointer;align-items:center;gap:6px;display:flex}.quad-stage{border:1px solid var(--line);background:repeating-conic-gradient(#eee6d8 0% 25%,#fbf6ec 0% 50%) 0 0/22px 22px;border-radius:14px;overflow:hidden}.quad-stage canvas{width:100%;height:auto;display:block}.quad-facts{color:var(--muted);margin:10px 0 0;font-size:12px}.quad-facts b{color:var(--ink)}.quad-degenerate{text-align:center;color:#97463d;margin:16px 0;font-size:13px}.quad-download{justify-content:center;align-items:center;gap:8px;margin-top:12px;display:flex}.quad-download:disabled{opacity:.5;cursor:default}
.intro-locked,.intro-locked body{overscroll-behavior:none;overflow:hidden}.intro{--intro-progress:0;--intro-ink:#f6ece0;z-index:90;color:var(--intro-ink);font-family:var(--font-sans), sans-serif;background:radial-gradient(circle at 50% 34%,#784a3a5c,#0000 58%),radial-gradient(circle at 18% 88%,#46386057,#0000 52%),linear-gradient(168deg,#1b1512,#241a1c 46%,#14100f);animation:.6s both intro-in;position:fixed;inset:0}[lang=ar] .intro{font-family:var(--font-sans-ar), var(--font-sans), sans-serif}@keyframes intro-in{0%{opacity:0}to{opacity:1}}.intro-stage{position:absolute;inset:0}.intro-stage canvas{width:100%;height:100%;display:block}.intro-scroller{overscroll-behavior:contain;scrollbar-width:none;-webkit-overflow-scrolling:touch;position:absolute;inset:0;overflow:hidden auto}.intro-scroller::-webkit-scrollbar{width:0;height:0}.intro-scroller:focus{outline:0}.intro-scroller:focus-visible{outline-offset:-4px;outline:2px solid #d8b48f}.intro-track{pointer-events:none}.intro-skip,.intro-rail,.intro-copy,.intro-cards,.intro-loading,.intro-hint{position:fixed}.intro-skip{color:var(--intro-ink);letter-spacing:.02em;cursor:pointer;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#140f0d6b;border:1px solid #f6ece047;border-radius:999px;padding:9px 20px;font-size:12px;font-weight:600;transition:background .2s,border-color .2s;inset-block-start:22px;inset-inline-end:24px}.intro-skip:hover{background:#f6ece029;border-color:#f6ece080}.intro-rail{background:#f6ece024;border-radius:2px;width:2px;inset-block:26vh;inset-inline-start:26px;overflow:hidden}.intro-rail i{width:100%;height:100%;transform:scaleY(var(--intro-progress));transform-origin:top;background:linear-gradient(#eb7c6b,#d8bd70);border-radius:2px;display:block}.intro-copy{text-align:center;font:400 clamp(19px, 2.6vw, 34px)/1.45 var(--font-serif), serif;letter-spacing:-.01em;text-wrap:balance;text-shadow:0 2px 22px #0c0806bf;pointer-events:none;margin:0;padding:0 clamp(24px,8vw,120px);inset-block-end:clamp(96px,16vh,168px);inset-inline:0}[lang=ar] .intro-copy{font-family:var(--font-serif-ar), var(--font-serif), serif}.intro-copy.handing-over{color:#f6ece0b8;font-size:clamp(15px,1.6vw,20px);transition:opacity .4s;inset-block:clamp(52px,9vh,104px) auto}.intro-copy span{animation:.75s cubic-bezier(.22,1,.36,1) both intro-line;display:inline-block}@keyframes intro-line{0%{opacity:0;filter:blur(5px);transform:translateY(14px)}to{opacity:1;filter:none;transform:none}}.intro-hint{letter-spacing:.16em;text-transform:uppercase;color:#f6ece099;pointer-events:none;flex-direction:column;align-items:center;gap:9px;font-size:11px;display:flex;inset-block-end:30px;inset-inline:0}.intro-hint i{background:linear-gradient(#f6ece0a6,#0000);width:1px;height:30px;animation:1.9s ease-in-out infinite intro-drift}@keyframes intro-drift{0%,to{opacity:.25;transform:translateY(-6px)}50%{opacity:1;transform:translateY(2px)}}.intro-cards{opacity:0;visibility:hidden;flex-direction:column;align-items:center;gap:16px;padding:0 20px;transition:opacity .5s,transform .5s cubic-bezier(.22,1,.36,1),visibility .5s;display:flex;inset-block-end:clamp(28px,6vh,62px);inset-inline:0;transform:translateY(22px)}.intro-cards.shown{opacity:1;visibility:visible;transform:none}.intro-cards strong{font:500 clamp(14px, 1.4vw, 18px)/1 var(--font-serif), serif;color:#f6ece0b8}[lang=ar] .intro-cards strong{font-family:var(--font-serif-ar), var(--font-serif), serif}.intro-card-row{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;width:min(100%,900px);display:grid}.intro-card-row button{border:1px solid color-mix(in srgb, var(--subject-accent), transparent 62%);background:color-mix(in srgb, var(--subject-accent), #120d0bdb 84%);color:var(--intro-ink);text-align:start;cursor:pointer;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:16px;flex-direction:column;gap:5px;padding:15px 16px;transition:transform .22s,border-color .22s,background .22s;display:flex}.intro-card-row button:hover{border-color:var(--subject-accent);background:color-mix(in srgb, var(--subject-accent), #120d0bdb 70%);transform:translateY(-3px)}.intro-card-row button b{color:color-mix(in srgb, var(--subject-accent), #fff 46%);font-size:15px;font-weight:700}.intro-card-row button span{color:#f6ece09e;font-size:11px;line-height:1.5}.intro-loading{letter-spacing:.08em;color:#f6ece0a8;pointer-events:none;flex-direction:column;align-items:center;gap:14px;font-size:12px;display:flex;inset-block-start:50%;inset-inline:0;transform:translateY(-50%)}.intro-loading i{border:1.5px solid #f6ece02e;border-top-color:#eb7c6b;border-radius:50%;width:34px;height:34px;animation:1s linear infinite intro-spin}@keyframes intro-spin{to{transform:rotate(360deg)}}@media (max-width:780px){.intro-rail{inset-block:30vh;inset-inline-start:14px}.intro-skip{padding:8px 16px;inset-block-start:14px;inset-inline-end:14px}.intro-copy{padding:0 26px;font-size:clamp(17px,4.6vw,23px);inset-block-end:clamp(120px,22vh,210px)}.intro-card-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.intro-card-row button{border-radius:14px;padding:12px 13px}.intro-card-row button span{display:none}}@media (max-height:540px){.intro-cards{gap:9px;inset-block-end:14px}.intro-card-row{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.intro-card-row button{border-radius:12px;padding:8px 11px}.intro-card-row button b{font-size:13px}.intro-card-row button span{display:none}.intro-copy{inset-block-end:clamp(74px,24vh,120px)}.intro-copy.handing-over{inset-block-start:14px}.intro-hint{display:none}}@media (prefers-reduced-motion:reduce){.intro,.intro-copy span,.intro-hint i,.intro-loading i,.intro-cards{transition:none;animation:none}}