:root{--walnut:#6B4226;--walnut-dark:#4B2C18;--amber:#C98A3E;--amber-light:#E8B86A;--cream:#FAF6EE;--parchment:#F2E5CC;--ink:#2B2420;--muted:#75685D;--coral:#E85A4F;--line:#D8C09A;--shadow:0 12px 28px rgba(75,44,24,.16)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:ui-rounded,"Arial Rounded MT Bold","Trebuchet MS",sans-serif;background:var(--cream);color:var(--ink)}body{background-image:radial-gradient(circle at 10% 5%,rgba(201,138,62,.08),transparent 25%),radial-gradient(circle at 90% 90%,rgba(107,66,38,.07),transparent 30%)}button{font:inherit;border:0;cursor:pointer;color:inherit}.screen{min-height:100vh;padding:14px 16px 18px;display:flex;flex-direction:column;align-items:center}.content{width:min(760px,100%);flex:1}.topbar{width:min(900px,100%);min-height:54px;display:flex;align-items:center;gap:12px;margin-bottom:12px}.brand{display:flex;align-items:center;gap:9px;margin:auto}.brand-mark{width:38px;height:38px;display:grid;place-items:center;background:var(--walnut);color:#fff;border-radius:11px;font-size:22px;box-shadow:0 3px 0 var(--walnut-dark)}.brand strong,.brand small{display:block}.brand strong{font-size:18px;color:var(--walnut)}.brand small{font-size:12px;color:var(--muted)}.top-actions{min-width:58px;text-align:right}.streak{display:inline-block;background:#fff7e6;border:1px solid var(--line);color:var(--walnut);padding:8px 11px;border-radius:999px;font-weight:800}.icon-btn{width:42px;height:42px;border-radius:12px;background:var(--walnut);color:#fff;font-size:25px;box-shadow:0 3px 0 var(--walnut-dark)}.footer{width:min(900px,100%);text-align:center;color:var(--walnut);font-size:11px;font-weight:700;line-height:1.45;margin-top:16px}.footer small{font-weight:500;color:var(--muted)}.primary,.secondary{min-height:50px;padding:13px 22px;border-radius:14px;font-weight:900;font-size:17px}.primary{background:linear-gradient(#D99A4A,#B8732E);color:#fff;box-shadow:0 4px 0 var(--walnut-dark)}.primary:active{transform:translateY(3px);box-shadow:0 1px 0 var(--walnut-dark)}.secondary{background:#F4E5CA;border:2px solid #D4B47D;color:var(--walnut);box-shadow:0 3px 0 #C8A66C}.center{text-align:center}.actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:14px}.welcome-screen{position:relative;overflow:hidden;background:var(--cream);padding:30px 22px 18px}.welcome-screen:before,.welcome-screen:after{content:"";position:absolute;inset:auto -40px 0;height:90px;background:rgba(201,138,62,.12);border-radius:50% 50% 0 0}.welcome-screen:after{height:35px;background:rgba(107,66,38,.08)}.welcome-skip{position:absolute;right:20px;top:18px;font-weight:800;color:var(--walnut)}.welcome-brand{margin-top:30px;text-align:center;font-size:44px;font-weight:950;letter-spacing:-1px;color:var(--walnut)}.welcome-brand span{display:block;color:var(--amber);font-size:39px}.tagline{text-align:center;margin:4px 0 6px;color:#7A3F1F;font-size:17px;font-weight:700}.speech{position:absolute;right:max(5%,calc(50% - 330px));top:360px;font-size:16px;line-height:1.35;transform:rotate(-3deg);color:var(--walnut)}.babi{display:block;margin:auto;overflow:visible}.babi-hero{width:min(300px,72vw);height:min(300px,72vw);margin-top:8px}.babi-medium{width:105px;height:105px}.babi-small{width:70px;height:70px;margin:0}.babi-large{width:190px;height:190px;margin:0 auto -4px}.babi-idle{animation:babiBob 3s ease-in-out infinite}.babi-happy{animation:babiHappy .55s ease both}.babi-encourage{animation:babiEncourage .55s ease both}.babi-celebrate{animation:babiCelebrate .85s cubic-bezier(.2,.8,.2,1) both}.welcome-start{position:relative;z-index:2;width:min(290px,90%);margin:12px auto 0;display:block;font-size:19px}.welcome-start span{margin-left:8px}.home-hero{text-align:center;padding:4px 0 10px}.home-hero h1,.map-intro h1{font-size:34px;margin:2px 0 2px;color:var(--walnut)}.home-hero p,.map-intro p{margin:0;color:var(--muted);font-size:16px}.home-menu{display:grid;gap:10px;margin-top:12px}.menu-btn{display:grid;grid-template-columns:54px 1fr 24px;align-items:center;text-align:left;width:100%;min-height:68px;padding:7px 14px 7px 7px;background:linear-gradient(110deg,#704522,#9A602D 55%,#7A4A27);color:#fff;border-radius:14px;box-shadow:0 4px 0 var(--walnut-dark)}.menu-btn:active:not(:disabled){transform:translateY(2px);box-shadow:0 2px 0 var(--walnut-dark)}.menu-icon{width:48px;height:54px;display:grid;place-items:center;background:rgba(60,32,16,.38);border-radius:10px;font-size:25px;color:#FFD37F}.menu-btn strong,.menu-btn small{display:block}.menu-btn strong{font-size:16px}.menu-btn small{font-size:13px;opacity:.82;margin-top:2px}.menu-btn b{font-size:28px;font-weight:500}.menu-btn.placeholder{opacity:.78;cursor:default}.menu-btn.placeholder em{font-style:normal;font-size:11px;background:#F4D28E;color:var(--walnut);padding:5px 7px;border-radius:999px;font-weight:900}.map-intro{display:flex;align-items:center;justify-content:center;gap:10px;padding:8px 0 10px;text-align:left}.levels{display:grid;grid-template-columns:repeat(5,1fr);gap:9px}.level{min-height:66px;padding:7px 5px;background:linear-gradient(#9A602D,#704522);color:#fff;border-radius:11px;box-shadow:0 3px 0 var(--walnut-dark);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px}.level span{font-size:17px;color:#FFD37F}.level strong{font-size:21px}.level.current{outline:3px solid var(--amber);outline-offset:2px}.level.locked{background:#E8DDCC;color:#9B8A78;box-shadow:none}.level.locked span{filter:grayscale(1);color:#8D7B69}.map-note{margin:16px auto 8px;max-width:360px;text-align:center;background:#F5E8D0;border:1px solid #D8C09A;border-radius:14px;padding:13px;font-weight:800;color:var(--walnut)}.map-note strong{display:block;color:var(--coral);font-size:18px;margin-top:2px}.quote{text-align:center;color:var(--muted);font-style:italic;font-size:14px}.practice-meta{display:flex;justify-content:space-between;color:var(--walnut);font-weight:900;font-size:14px}.problem{font-size:clamp(54px,13vw,94px);font-weight:950;letter-spacing:-3px;text-align:center;margin:2px 0 0;line-height:1.05;color:var(--ink)}.problem span{color:var(--coral)}.hint{text-align:center;color:var(--muted);font-size:16px;margin:5px 0 9px}.hint-visible{color:var(--walnut);font-weight:800}.abacus-wrap{margin:5px auto 12px;padding:0 2px}.abacus{position:relative;width:min(620px,100%);margin:auto;padding:22px 18px;background:linear-gradient(135deg,#8D542B,#C98A3E 45%,#70421F);border:8px solid 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rgba(0,0,0,.35);position:relative;z-index:3}.lower-zone{height:170px;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:3px;position:relative;z-index:2}.bead{width:64px;height:38px;border-radius:50% / 42%;background:radial-gradient(circle at 34% 27%,#F0BF78,#C98A3E 52%,#824B23);border:2px solid #633716;box-shadow:inset 0 3px 4px rgba(255,255,255,.22),inset 0 -5px 8px rgba(64,34,14,.28),0 3px 3px rgba(0,0,0,.3);font-size:0;transition:transform .18s ease}.bead:after{content:"";display:block;width:8px;height:5px;border-radius:50%;background:rgba(255,239,202,.42);margin:5px 0 0 15px}.bead.upper{width:70px;height:46px}.bead.upper.active{transform:translateY(50px)}.bead.lower{transform:translateY(0)}.bead.lower.active{transform:translateY(-118px)}.answer-card{width:min(260px,80%);margin:5px auto 0;text-align:center;background:#F2E2C6;border:2px solid #D6B47B;border-radius:13px;padding:7px 12px}.answer-card small{display:block;color:var(--muted);font-weight:800;font-size:12px}.answer-card strong{font-size:30px;color:var(--walnut)}.result-title,.levelup-title{text-align:center;color:var(--walnut);font-size:38px;margin:0 0 2px}.result-title.coral{color:var(--coral)}.result-sub{text-align:center;color:var(--muted);font-size:18px;margin:0 0 12px}.result-problem{width:min(430px,94%);margin:14px auto 18px;background:#F1DFC0;border:2px solid #D6B47B;border-radius:14px;padding:13px;text-align:center;font-size:clamp(36px,9vw,56px);font-weight:950;letter-spacing:-1px}.result-problem span{color:var(--coral)}.levelup-card,.wall-card{width:min(470px,94%);margin:10px auto 16px;background:#F4E5CA;border:1px solid #D5B67D;border-radius:15px;padding:16px;text-align:center;color:var(--walnut);font-weight:800;line-height:1.45}.levelup-title{color:#D99A4A;font-size:46px}.wall-card h2{margin:0 0 4px}.wall-card strong{display:block;color:var(--coral);font-size:21px}.wall-card p{text-align:left;display:inline-block;margin:8px 0 0;line-height:1.8}.babi-large.babi-encourage{transform:rotate(-4deg)}@keyframes babiBob{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}@keyframes babiHappy{0%{transform:scale(.9)}55%{transform:scale(1.08,1.02)}100%{transform:scale(1)}}@keyframes babiEncourage{0%{transform:rotate(0)}50%{transform:rotate(-7deg) translateX(-2px)}100%{transform:rotate(-4deg)}}@keyframes babiCelebrate{0%{transform:translateY(12px) scale(.85)}55%{transform:translateY(-12px) scale(1.08,1.02)}75%{transform:translateY(2px) scale(.98)}100%{transform:translateY(0) scale(1)}}@media(max-width:520px){.screen{padding:10px 11px 16px}.welcome-brand{font-size:36px}.welcome-brand span{font-size:33px}.speech{position:static;text-align:center;transform:none;margin:0 auto 6px}.babi-hero{width:240px;height:240px}.levels{grid-template-columns:repeat(5,1fr);gap:6px}.level{min-height:60px}.abacus{padding:16px 9px;border-width:6px}.abacus-inner{padding:12px 7px;gap:5px}.rod-column{min-height:275px}.upper-zone{height:82px}.lower-zone{height:150px}.bead{width:53px;height:33px}.bead.upper{width:58px;height:39px}.bead.lower.active{transform:translateY(-102px)}.bead.upper.active{transform:translateY(43px)}.problem{letter-spacing:-2px}.menu-btn{min-height:64px}.menu-icon{height:50px}}@media(max-width:360px){.levels{grid-template-columns:repeat(3,1fr)}.rod-column{min-height:245px}.lower-zone{height:130px}.bead{width:45px;height:29px}.bead.upper{width:50px;height:34px}.bead.lower.active{transform:translateY(-88px)}.bead.upper.active{transform:translateY(36px)}}