:root{--bg: #fff8f0;--ink: #1f1640;--muted: #6b6488;--card: #ffffff;--line: #ece6f7;--pri: #7c3aed;--pri2: #ec4899;--ok: #10b981;--no: #f43f5e;--yel: #fbbf24;--r: 20px;--sh: 0 6px 0 rgba(31, 22, 64, .08), 0 14px 30px rgba(124, 58, 237, .1);--font: ui-rounded, "SF Pro Rounded", "Nunito", "Varela Round", "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.5;font-size:17px;background-image:radial-gradient(circle at 8% 12%,#ffe4f1 0 120px,transparent 121px),radial-gradient(circle at 92% 30%,#e0f2fe 0 160px,transparent 161px),radial-gradient(circle at 15% 85%,#ecfccb 0 140px,transparent 141px),radial-gradient(#ede9fe 1.2px,transparent 1.2px);background-size:auto,auto,auto,22px 22px;background-attachment:fixed}a{color:var(--pri)}button{font-family:inherit}h1,h2,h3{line-height:1.2;margin:.4em 0}h1{font-size:clamp(1.7rem,4vw,2.5rem)}.muted{color:var(--muted)}.small{font-size:.85rem}.center{text-align:center;justify-content:center}.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;z-index:99;background:#fff;padding:8px;border-radius:8px}:focus-visible{outline:3px solid #f59e0b;outline-offset:2px}.app{min-height:100vh;display:flex;flex-direction:column}#main{flex:1}.page{max-width:860px;margin:0 auto;padding:18px 16px 72px}.page.wide{max-width:1180px}.route{animation:fadeIn .25s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.header{position:sticky;top:0;z-index:30;background:#ffffffe0;backdrop-filter:blur(10px);border-bottom:2px solid var(--line)}.header-in{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:14px;padding:8px 16px}.brand{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-weight:900;font-size:1.25rem}.brand-logo{font-size:1.9rem;display:inline-block;animation:wiggle 4s infinite}.brand-name{background:linear-gradient(90deg,var(--pri),var(--pri2));-webkit-background-clip:text;background-clip:text;color:transparent}@keyframes wiggle{0%,90%,to{transform:rotate(0)}93%{transform:rotate(-12deg)}96%{transform:rotate(12deg)}}.nav{display:flex;gap:4px;margin-left:8px}.nav a{text-decoration:none;color:var(--ink);font-weight:800;padding:8px 14px;border-radius:999px}.nav a:hover{background:#f5f3ff}.nav a.active{background:var(--pri);color:#fff}.header-right{margin-left:auto;display:flex;align-items:center;gap:8px}.pchip{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);background:#f5f3ff;padding:4px 12px 4px 4px;border-radius:999px;border:2px solid #ddd6fe}.pchip-av{font-size:1.5rem;background:#fff;border-radius:50%;width:38px;height:38px;display:grid;place-items:center}.pchip-txt{display:flex;flex-direction:column;line-height:1.1}.pchip-txt small{color:var(--muted);font-weight:700}.burger{display:none;border:0;background:#f5f3ff;font-size:1.3rem;border-radius:12px;width:42px;height:42px;cursor:pointer}.icon-btn{border:2px solid var(--line);background:#fff;border-radius:14px;font-size:1.3rem;min-width:46px;height:46px;cursor:pointer;transition:transform .1s}.icon-btn.small{min-width:40px;height:40px;font-size:1.1rem}.icon-btn:active{transform:scale(.92)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font-weight:900;font-size:1rem;border-radius:16px;padding:12px 20px;border:0;cursor:pointer;text-decoration:none;transition:transform .1s,box-shadow .1s;color:var(--ink);background:#fff;box-shadow:0 4px #0000001f}.btn:active{transform:translateY(3px);box-shadow:0 1px #0000001f}.btn.big{font-size:1.12rem;padding:15px 24px;border-radius:18px}.btn.small{padding:7px 12px;font-size:.9rem;border-radius:12px}.btn.primary{background:linear-gradient(135deg,var(--pri),#a855f7);color:#fff;box-shadow:0 5px #5b21b6}.btn.yellow{background:var(--yel);color:#3b2300;box-shadow:0 5px #b45309}.btn.ghost{background:#fff;border:2px solid var(--line);box-shadow:0 3px 0 var(--line)}.btn.danger{color:var(--no)}.btn:disabled{opacity:.45;cursor:not-allowed}.link-btn{background:none;border:0;color:var(--pri);font-weight:800;cursor:pointer;padding:8px 0;font-size:1rem}.row{display:flex;gap:10px;align-items:center;margin:12px 0}.row.wrap{flex-wrap:wrap}.pill{display:inline-block;background:#fef3c7;color:#92400e;font-weight:800;padding:4px 12px;border-radius:999px;font-size:.85rem}.back{display:inline-block;text-decoration:none;font-weight:800;margin:4px 0 6px}.hero{display:grid;grid-template-columns:1.2fr 1fr;gap:28px;align-items:center;padding:26px 0 10px}.hero h1{font-size:clamp(2.1rem,5.5vw,3.6rem)}.grad{background:linear-gradient(90deg,#f97316,var(--pri2),var(--pri));-webkit-background-clip:text;background-clip:text;color:transparent}.lead{font-size:1.15rem;color:#3f3863}.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0 10px}.hero-art{position:relative;min-height:300px;display:grid;place-items:center}.hero-mascot{font-size:9rem;filter:drop-shadow(0 12px 18px rgba(0,0,0,.15));animation:bob 3s ease-in-out infinite}.hero-card{position:absolute;bottom:6px;right:6px;background:#fff;border-radius:18px;padding:12px 16px;box-shadow:var(--sh);font-size:1.4rem;font-weight:900;transform:rotate(-3deg)}.hero-card small{display:block;font-size:.8rem;color:var(--muted)}.float{position:absolute;font-size:2.4rem;animation:bob 4s ease-in-out infinite}.f1{top:6%;left:12%}.f2{top:12%;right:10%;animation-delay:.6s}.f3{bottom:20%;left:4%;animation-delay:1.2s}.f4{top:48%;right:2%;animation-delay:1.8s;font-weight:900;color:var(--pri)}@keyframes bob{0%,to{transform:translateY(0)}50%{transform:translateY(-12px)}}.howto{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0 8px}.howto-card{background:#fff;border-radius:var(--r);padding:16px;box-shadow:var(--sh);border:2px solid var(--line)}.howto-card h3{margin:6px 0}.howto-card p{margin:0;color:var(--muted);font-size:.95rem}.howto-ic{font-size:2rem}.section-title{font-size:1.6rem;margin:30px 0 14px}.section-title.small{font-size:1.25rem;margin:22px 0 10px}.class-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}.class-card{--c: #7c3aed;position:relative;display:flex;flex-direction:column;gap:2px;text-decoration:none;color:var(--ink);background:#fff;border-radius:22px;padding:16px;border:3px solid color-mix(in srgb,var(--c) 35%,white);box-shadow:0 6px color-mix(in srgb,var(--c) 45%,white);transition:transform .15s;overflow:hidden}.class-card:before{content:"";position:absolute;right:-30px;top:-30px;width:100px;height:100px;border-radius:50%;background:color-mix(in srgb,var(--c) 18%,white)}.class-card:hover{transform:translateY(-4px) rotate(-.5deg)}.class-card.mine{outline:4px solid var(--c)}.class-emoji{font-size:2.4rem;position:relative}.class-no{font-weight:900;font-size:1.35rem;color:color-mix(in srgb,var(--c) 75%,black)}.class-age{font-size:.8rem;font-weight:800;color:var(--muted)}.class-tag{font-size:.88rem;margin-top:4px}.class-meta{margin-top:8px;font-size:.78rem;font-weight:800;color:var(--muted)}.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.tech-card{--c: #7c3aed;display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--ink);background:#fff;border-radius:var(--r);padding:16px;border-left:8px solid var(--c);box-shadow:var(--sh)}.tech-card span:not(.tech-ic){color:var(--muted);font-size:.95rem}.tech-card small{color:var(--c);font-weight:900}.tech-ic{font-size:2rem}.stats-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:28px 0;background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;border-radius:26px;padding:20px;text-align:center}.stats-strip b{display:block;font-size:2rem}.stats-strip span{opacity:.9;font-weight:700}.bubble-wrap{display:flex;gap:12px;align-items:flex-start;margin:16px 0}.bubble-mascot{font-size:3rem;line-height:1;animation:bob 3s ease-in-out infinite}.bubble{position:relative;background:#fff;border:3px solid #ddd6fe;border-radius:22px;padding:14px 18px;box-shadow:var(--sh);flex:1}.bubble:before{content:"";position:absolute;left:-12px;top:18px;border:10px solid transparent;border-right-color:#ddd6fe;border-left:0}.class-hero{--c: #7c3aed;display:grid;grid-template-columns:1.4fr 1fr;gap:18px;align-items:center;background:linear-gradient(135deg,color-mix(in srgb,var(--c) 22%,white),#fff);border:3px solid color-mix(in srgb,var(--c) 40%,white);border-radius:28px;padding:18px 22px;box-shadow:var(--sh)}.class-hero h1{margin:0}.class-hero p{margin:4px 0 10px;font-weight:700}.class-hero-stats{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 10px}.class-hero-stats span{background:#fff;border-radius:999px;padding:4px 12px;font-weight:800;font-size:.9rem;border:2px solid var(--line)}.class-hero-actions{display:flex;flex-direction:column;gap:10px}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}.topic-card{--c: #7c3aed;position:relative;display:flex;flex-direction:column;gap:4px;background:#fff;color:var(--ink);text-decoration:none;border-radius:22px;padding:16px;border:2px solid var(--line);box-shadow:0 5px color-mix(in srgb,var(--c) 30%,white);transition:transform .15s}.topic-card:hover{transform:translateY(-3px);border-color:var(--c)}.topic-no{position:absolute;right:14px;top:12px;font-weight:900;color:color-mix(in srgb,var(--c) 60%,white);font-size:1.3rem}.topic-emoji{font-size:2.2rem}.topic-title{font-weight:900;font-size:1.12rem}.topic-sum{color:var(--muted);font-size:.92rem;flex:1}.topic-foot{display:flex;justify-content:space-between;align-items:center;margin-top:8px;gap:6px}.topic-acc{font-size:.78rem;font-weight:800;color:var(--muted)}.tech-badge{color:#fff;font-size:.75rem;font-weight:900;padding:4px 10px;border-radius:999px;white-space:nowrap}.stars{letter-spacing:2px;font-size:1.2rem;color:#e5e7eb}.stars .on{color:#f59e0b;text-shadow:0 1px 0 #b45309}.progress{height:14px;background:#ede9fe;border-radius:999px;overflow:hidden;margin:8px 0}.progress-bar{height:100%;background:linear-gradient(90deg,#22c55e,#84cc16);border-radius:999px;transition:width .4s}.lesson-head{--c: #7c3aed;display:flex;gap:14px;align-items:center;background:#fff;border-radius:24px;padding:14px 18px;border-left:10px solid var(--c);box-shadow:var(--sh)}.lesson-head h1{margin:0 0 4px}.lesson-emoji{font-size:3rem}.tabs{display:flex;gap:8px;margin:16px 0 6px;background:#fff;padding:6px;border-radius:18px;border:2px solid var(--line)}.tabs button{flex:1;border:0;background:transparent;font-weight:900;font-size:1.05rem;padding:12px;border-radius:14px;cursor:pointer;color:var(--ink)}.tabs button.on{background:var(--pri);color:#fff}.learn-card,.info-card{background:#fff;border-radius:var(--r);padding:16px 20px;border:2px solid var(--line);box-shadow:var(--sh);margin:14px 0}.learn-card h3{margin-top:4px}.sutra{margin:0 0 6px;color:#9a3412;font-weight:700}.steps{padding-left:0;list-style:none;counter-reset:s;margin:8px 0}.steps li{counter-increment:s;position:relative;padding:8px 10px 8px 46px;margin:6px 0;background:#faf7ff;border-radius:14px;animation:pop .35s both}.steps li:before{content:counter(s);position:absolute;left:8px;top:7px;width:28px;height:28px;border-radius:50%;background:var(--pri);color:#fff;font-weight:900;display:grid;place-items:center;font-size:.9rem}.steps.big li{font-size:1.05rem}@keyframes pop{0%{opacity:0;transform:translateY(6px) scale(.98)}to{opacity:1;transform:none}}.why-tip{display:grid;grid-template-columns:1fr 1fr;gap:12px}.why,.tip{border-radius:18px;padding:12px 16px}.why{background:#e0f2fe}.tip{background:#fef9c3}.why h4,.tip h4{margin:0 0 4px}.why p,.tip p{margin:0}.examples{display:grid;gap:12px}.example{background:#fff;border-radius:18px;padding:14px 16px;border:2px dashed #c4b5fd}.example-head{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:1.15rem}.answer-reveal{background:#dcfce7;color:#065f46;border-radius:12px;padding:8px 12px;font-size:1.1rem;display:inline-block;margin-top:6px}.recap{margin-top:18px;background:#fff;border-radius:16px;padding:10px 14px;border:2px solid var(--line)}.recap summary{cursor:pointer;font-weight:800}.practice-top{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px}.levels{display:inline-flex;gap:6px;background:#fff;padding:5px;border-radius:14px;border:2px solid var(--line);margin:6px 0;flex-wrap:wrap}.levels button{border:0;background:transparent;font-weight:800;padding:7px 14px;border-radius:10px;cursor:pointer;font-size:.95rem;color:var(--ink)}.levels button.on{background:var(--yel);color:#3b2300}.qcard{background:#fff;border-radius:26px;padding:20px;margin:12px 0;border:3px solid #ddd6fe;box-shadow:var(--sh)}.qprompt-row{display:flex;gap:12px;align-items:flex-start;justify-content:space-between}.qprompt{font-size:clamp(1.25rem,3.6vw,1.85rem);margin:0;word-break:break-word}.qvisual{display:flex;justify-content:center;margin:14px 0}.qvisual.small svg{max-width:260px}.qvisual svg{width:100%;max-width:340px;height:auto}.qvisual svg.vis-abacus{width:auto;max-width:100%;height:230px}.vis-emoji{display:flex;flex-direction:column;gap:6px;align-items:center;font-size:clamp(1.8rem,6vw,2.4rem)}.vis-row{display:flex;gap:8px;background:#fff7ed;padding:4px 10px;border-radius:14px}.vis-groups{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.vis-group{display:grid;grid-template-columns:repeat(3,auto);gap:4px;background:#f0fdf4;border:3px dashed #86efac;border-radius:50%;padding:14px;font-size:1.5rem;min-width:90px;justify-content:center}.vis-tenframe{display:grid;grid-template-columns:repeat(5,46px);gap:6px;background:#1e3a8a;padding:8px;border-radius:12px}.vis-tenframe span{width:46px;height:46px;border-radius:8px;background:#fff;position:relative}.vis-tenframe span.on:after{content:"";position:absolute;inset:7px;border-radius:50%;background:#ef4444}.choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}.choice{display:flex;align-items:center;gap:12px;font-size:1.3rem;font-weight:900;padding:14px 16px;border-radius:18px;border:3px solid #fde68a;background:#fffbeb;cursor:pointer;text-align:left;color:var(--ink);transition:transform .1s;min-height:64px}.choice:hover:not(:disabled){transform:translateY(-2px);border-color:#f59e0b}.choice-key{width:34px;height:34px;flex:none;border-radius:50%;background:#f59e0b;color:#fff;display:grid;place-items:center;font-size:1rem}.choice.right{background:#dcfce7;border-color:var(--ok)}.choice.right .choice-key{background:var(--ok)}.choice.wrong{background:#ffe4e6;border-color:var(--no);animation:shake .35s}.choice.wrong .choice-key{background:var(--no)}.choice.picked{background:#ede9fe;border-color:var(--pri)}.choice.picked .choice-key{background:var(--pri)}.choice:disabled{cursor:default}@keyframes shake{25%{transform:translate(-6px)}75%{transform:translate(6px)}}.answer-zone{display:flex;flex-direction:column;align-items:center;gap:12px;margin-top:14px}.answer-box{min-width:220px;min-height:66px;display:flex;align-items:center;justify-content:center;gap:6px;font-size:2rem;font-weight:900;background:#f5f3ff;border:3px solid #c4b5fd;border-radius:18px;padding:6px 18px}.answer-box.right{background:#dcfce7;border-color:var(--ok)}.answer-box.wrong{background:#ffe4e6;border-color:var(--no);animation:shake .35s}.answer-box.picked{border-color:var(--pri)}.answer-box .ph{color:#c4b5fd}.unit{font-size:1.1rem;color:var(--muted)}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;width:100%;max-width:330px}.keypad button{font-size:1.5rem;font-weight:900;height:58px;border-radius:16px;border:0;background:#fff;box-shadow:0 4px #ddd6fe,inset 0 0 0 2px #ede9fe;cursor:pointer;color:var(--ink);touch-action:manipulation}.keypad button:active{transform:translateY(3px);box-shadow:0 1px #ddd6fe}.keypad button.muted{color:var(--muted);font-size:1.2rem}.keypad button.wide{grid-column:span 3}.keypad button.ok{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;box-shadow:0 4px #15803d;font-size:1.25rem}.keypad button.ok:disabled{opacity:.5}.hint-zone{margin-top:10px;text-align:center}.hint{background:#fef9c3;border-radius:14px;padding:10px 14px;text-align:left}.feedback{border-radius:24px;padding:16px 18px;margin:12px 0;border:3px solid;animation:pop .3s;scroll-margin-top:84px}.feedback.ok{background:#f0fdf4;border-color:#86efac}.feedback.no{background:#fff1f2;border-color:#fda4af}.fb-head{display:flex;gap:12px;align-items:center}.fb-head strong{font-size:1.3rem}.fb-mascot{font-size:2.6rem}.fb-sub{color:#3f3863}.strike{text-decoration:line-through;color:var(--no)}.mistake{background:#fff;border-radius:12px;padding:8px 12px;margin:10px 0 0;border:2px dashed #fda4af;font-weight:700}.fb-trick{margin:10px 0 4px;font-weight:700;color:#6d28d9}.sticky-next{position:sticky;bottom:10px;z-index:5}.round-end,.result-card,.test-intro{position:relative;text-align:center;background:#fff;border-radius:28px;padding:26px 18px;margin:16px 0;box-shadow:var(--sh);border:3px solid #ddd6fe;overflow:hidden}.big-emoji{font-size:4.5rem;animation:bob 2.5s ease-in-out infinite}.result-card h1{font-size:3rem;margin:4px 0}.result-card .stars,.round-end .stars{font-size:2.2rem}.weak{background:#fef3c7;border-radius:16px;padding:10px;margin:12px 0}.checklist{text-align:left;max-width:520px;margin:14px auto}.confetti{pointer-events:none;position:absolute;inset:0;overflow:hidden;z-index:3}.confetti i{position:absolute;top:-12px;width:10px;height:16px;border-radius:3px;animation:fall 2.2s ease-in forwards}@keyframes fall{to{top:110%;transform:rotate(720deg);opacity:.6}}.tests-top{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}.set-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(70px,1fr));gap:8px;margin-top:10px}.set-tile{display:flex;flex-direction:column;align-items:center;justify-content:center;text-decoration:none;color:var(--ink);background:#fff;border-radius:14px;padding:8px 4px;border:2px solid var(--line);box-shadow:0 3px 0 var(--line);font-size:.95rem}.set-tile small{font-size:.72rem;font-weight:800;color:var(--muted)}.set-tile.l1{border-top:5px solid #86efac}.set-tile.l2{border-top:5px solid #fcd34d}.set-tile.l3{border-top:5px solid #fca5a5}.set-tile.gold{background:#fef3c7}.set-tile.good{background:#dcfce7}.set-tile.try{background:#ffe4e6}.set-tile.ip{background:#ede9fe}.test-bar,.lightning-bar{display:flex;justify-content:space-between;gap:8px;background:#fff;border-radius:16px;padding:10px 14px;font-weight:900;border:2px solid var(--line);flex-wrap:wrap}.lightning-bar{font-size:1.4rem;background:#fef3c7}.lightning-bar.hurry{background:#ffe4e6;animation:shake .5s infinite}.qnum{font-weight:800;color:var(--muted);margin-top:8px}.test-nav{display:flex;justify-content:space-between;gap:8px;margin:10px 0;flex-wrap:wrap}.qmap{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;margin-top:12px}.qmap button{height:38px;border-radius:10px;border:2px solid var(--line);background:#fff;font-weight:800;cursor:pointer;color:var(--ink)}.qmap button.done{background:#ede9fe;border-color:#c4b5fd}.qmap button.cur{outline:3px solid var(--pri)}.review-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px}.toggle{font-weight:800;display:flex;gap:6px;align-items:center;cursor:pointer}.rev{background:#fff;border-radius:18px;margin:8px 0;border:2px solid var(--line);overflow:hidden}.rev.ok{border-color:#bbf7d0}.rev.no{border-color:#fecdd3}.rev-head{width:100%;display:flex;gap:10px;align-items:center;background:none;border:0;padding:10px 12px;cursor:pointer;text-align:left;font-size:1rem;color:var(--ink)}.rev-n{flex:none;width:30px;height:30px;border-radius:50%;background:#f5f3ff;display:grid;place-items:center;font-weight:900}.rev-q{flex:1;font-weight:700}.rev-a{font-weight:800;white-space:nowrap}.rev .feedback{margin:0 10px 10px}.flash.ok .qcard{border-color:var(--ok)}.flash.no .qcard{border-color:var(--no)}.search{width:100%;font-size:1.05rem;padding:14px 16px;border-radius:16px;border:2px solid #ddd6fe;margin:8px 0 12px;font-family:inherit}.trick-sec{margin:22px 0;scroll-margin-top:80px}.trick-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:10px}.trick-item{--c: #7c3aed;display:flex;gap:12px;align-items:center;background:#fff;border-radius:16px;padding:10px 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.r{transform:rotateY(90deg) translateZ(100px)}.solid.cuboid .t{transform:rotateX(90deg) translateZ(55px)}.solid.cuboid .u{transform:rotateX(-90deg) translateZ(55px)}.solid-svg{width:240px;max-width:80%;height:auto}.solid-svg.spin-y{animation:wobble3d 4s ease-in-out infinite}@keyframes spin3d{0%{transform:rotateX(-22deg) rotateY(0)}to{transform:rotateX(-22deg) rotateY(360deg)}}@keyframes wobble3d{0%,to{transform:perspective(600px) rotateY(-25deg)}50%{transform:perspective(600px) rotateY(25deg)}}.step-box{border:2px solid var(--line);border-radius:16px;padding:10px 14px;margin:12px 0}.step-box h3{margin:2px 0 8px;font-size:1.05rem;display:flex;flex-wrap:wrap;gap:8px;align-items:center}.step-box.guide{background:#fff7ed;border-color:#fed7aa}.help-list{margin:8px 0 4px;padding-left:22px}.help-list li{margin:6px 0}.voice-select{flex:1;min-width:200px;max-width:100%;font:inherit;padding:9px 10px;border-radius:12px;border:2px solid #ddd6fe;background:#fff}.audio-banner .row{margin:0}.legal ul{padding-left:20px}.legal li{margin:6px 0}@media (max-width: 900px){.tbl-detail{grid-template-columns:1fr}}@media (max-width: 520px){.explainer{padding:10px;border-radius:18px}.ex-ctrl .btn{padding:7px 10px}.ex-stage{min-height:160px}.solid-wrap{height:220px}.solid.cube,.solid.cuboid{transform:scale(.8) rotateX(-22deg) rotateY(35deg)}}@media (max-width: 420px){.hero-cta .btn{width:100%}}.tchart.compact .tc-q{min-width:0}.tchart.compact .tchart-row{gap:6px;padding:2px 4px;font-size:.9rem}.tbl-all{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.tbl-mini{min-width:0;overflow:hidden}.tbl-chip{position:relative;display:flex;align-items:center;justify-content:center;min-height:54px;padding:0}.tbl-chip b{font-size:1.3rem}.tbl-chip small{position:absolute;left:0;right:0;bottom:3px;text-align:center;font-size:.65rem}:root{--hdr-h: 64px}.header{position:fixed!important;top:0;left:0;right:0;z-index:40;background:#fffffff5;box-shadow:0 2px 12px #1f16400f;padding-top:env(safe-area-inset-top)}.app{padding-top:var(--hdr-h)}html{scroll-padding-top:calc(var(--hdr-h) + 12px)}.feedback,.trick-sec,.explainer{scroll-margin-top:calc(var(--hdr-h) + 12px)}.nav{max-height:calc(100vh - var(--hdr-h));overflow-y:auto}.footer{background:#1f1640;color:#e9e5ff;margin-top:48px}.footer-in{max-width:1180px;margin:0 auto;padding:36px 20px 24px;display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:28px 32px}.footer-brand p{margin:8px 0 12px;color:#c9c2ee;line-height:1.55;max-width:360px}.fb-logo{font-size:1.3rem;display:flex;align-items:center;gap:8px}.fb-logo span{font-size:1.8rem}.footer-badges{display:flex;flex-wrap:wrap;gap:8px}.footer-badges span{background:#ffffff14;border:1px solid rgba(255,255,255,.14);border-radius:999px;padding:4px 12px;font-size:.82rem;font-weight:700}.footer-col{display:flex;flex-direction:column;gap:10px}.footer-col h4{margin:4px 0;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;color:#fde68a}.footer-col a{color:#e9e5ff;text-decoration:none;font-weight:600;width:fit-content}.footer-col a:hover{color:#fde68a;text-decoration:underline}.footer-bottom{max-width:1180px;margin:0 auto;padding:16px 20px 28px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;font-size:.82rem;color:#b8b0e0}.footer-bottom p{margin:0;max-width:820px;line-height:1.5}@media (max-width: 860px){.footer-in{grid-template-columns:1fr 1fr 1fr}.footer-brand{grid-column:1 / -1}}@media (max-width: 520px){.footer-in{grid-template-columns:1fr 1fr;gap:22px;padding:28px 16px 18px}.footer-col:last-child{grid-column:1 / -1}.footer-bottom{padding:14px 16px 24px}}