:root{--ink:#10213a;--muted:#60718a;--paper:#f7fbff;--panel:#fff;--line:#dbe6f2;--blue:#3767e9;--blue2:#6fa8ff;--coral:#f2675f;--mint:#3ac6a0;--yellow:#ffd75a;--purple:#7d5ce7;--shadow:0 18px 48px rgba(20,49,91,.12);font-family:Inter,ui-rounded,"Avenir Next",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(circle at 10% 0%,#e5f4ff 0,transparent 35%),radial-gradient(circle at 95% 90%,#f0eaff 0,transparent 34%),var(--paper);min-height:100vh}button{font:inherit}.topbar{height:68px;padding:0 clamp(16px,4vw,54px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(158,180,207,.35);background:rgba(247,251,255,.88);backdrop-filter:blur(14px);position:relative;z-index:5}.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;color:#fff;background:linear-gradient(145deg,var(--blue),var(--purple));box-shadow:0 7px 16px rgba(55,103,233,.25);font-size:13px}.status-strip{display:flex;align-items:center;gap:10px}.stat{height:36px;min-width:62px;padding:0 10px;display:flex;align-items:center;gap:6px;border-radius:12px;background:#fff;border:1px solid var(--line);font-variant-numeric:tabular-nums}.stat:first-child span{color:#f4b400}.stat:nth-child(2) span{color:var(--coral)}.icon-btn{width:36px;height:36px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);cursor:pointer;font-size:18px}.screen{display:none}.screen.active{display:block}.start-screen{min-height:calc(100vh - 68px);padding:clamp(42px,7vw,90px) clamp(20px,7vw,100px) 28px;position:relative;overflow:hidden}.hero-copy{max-width:640px;position:relative;z-index:2}.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:800;color:var(--blue);margin-bottom:12px}.hero-copy h1{font-size:clamp(42px,7vw,78px);line-height:.98;letter-spacing:-.055em;margin:0;max-width:720px}.hero-copy h1 span{color:var(--blue)}.hero-copy>p{max-width:590px;color:var(--muted);font-size:clamp(16px,2vw,20px);line-height:1.55;margin:24px 0}.start-actions,.complete-actions{display:flex;gap:12px;flex-wrap:wrap}.primary-btn,.secondary-btn,.small-btn{border:0;border-radius:14px;padding:14px 20px;font-weight:800;cursor:pointer;transition:transform .16s,box-shadow .16s,opacity .16s}.primary-btn{color:#fff;background:linear-gradient(135deg,var(--blue),#624ee6);box-shadow:0 10px 23px rgba(55,103,233,.25)}.primary-btn:hover,.secondary-btn:hover,.small-btn:hover{transform:translateY(-2px)}.primary-btn:active,.secondary-btn:active,.small-btn:active{transform:translateY(0)}.secondary-btn,.small-btn{background:#fff;color:var(--ink);border:1px solid var(--line)}.small-btn{padding:8px 12px;border-radius:10px;font-size:13px}.teacher-note{font-size:14px!important}.hero-art{position:absolute;width:min(44vw,540px);aspect-ratio:1;right:5vw;top:8%;display:grid;place-items:center}.planet-grid{width:68%;aspect-ratio:1;border-radius:50%;background:repeating-linear-gradient(0deg,transparent 0 29px,rgba(55,103,233,.12) 30px),repeating-linear-gradient(90deg,#e9f4ff 0 29px,rgba(55,103,233,.14) 30px);border:2px solid rgba(55,103,233,.15);box-shadow:inset 0 0 55px #fff,0 30px 70px rgba(55,103,233,.16);position:absolute;transform:rotate(-8deg);overflow:hidden}.axis-x,.axis-y{position:absolute;background:rgba(55,103,233,.4)}.axis-x{height:2px;width:100%;top:50%}.axis-y{width:2px;height:100%;left:50%}.mascot{width:86px;height:76px;background:linear-gradient(145deg,#ffd957,#ffb62e);border-radius:52% 48% 45% 55%;position:absolute;filter:drop-shadow(0 12px 12px rgba(75,54,12,.18))}.big-mascot{width:128px;height:112px}.mascot:before,.mascot:after{content:"";position:absolute;background:#ffca3e;width:34%;height:34%;top:-7%;clip-path:polygon(50% 0,62% 35%,100% 42%,70% 65%,78% 100%,50% 80%,20% 100%,29% 65%,0 42%,38% 35%)}.mascot:before{left:-12%;transform:rotate(-28deg)}.mascot:after{right:-12%;transform:rotate(28deg)}.eye{position:absolute;width:10%;aspect-ratio:1;background:var(--ink);border-radius:50%;top:36%;z-index:2}.eye.left{left:29%}.eye.right{right:29%}.smile{position:absolute;left:43%;top:53%;width:15%;height:12%;border-bottom:3px solid var(--ink);border-radius:50%}.orbit{position:absolute;border:1px dashed rgba(55,103,233,.3);border-radius:50%}.orbit-a{inset:4%;transform:rotate(25deg) scaleY(.55)}.orbit-b{inset:13%;transform:rotate(-30deg) scaleY(.7)}.float-star{position:absolute;color:var(--yellow);font-size:30px;filter:drop-shadow(0 5px 6px rgba(160,105,0,.2))}.s1{left:8%;top:24%}.s2{right:5%;top:34%;font-size:22px}.s3{right:18%;bottom:8%;font-size:18px}.level-preview{position:absolute;left:clamp(20px,7vw,100px);right:clamp(20px,7vw,100px);bottom:26px;display:flex;gap:8px;z-index:2}.level-preview div{flex:1;padding:11px 14px;background:rgba(255,255,255,.75);border:1px solid var(--line);border-radius:12px;display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.level-preview b{color:var(--ink)}
.game-screen{padding:24px clamp(14px,3vw,44px) 42px}.mission-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:16px}.mission-head h2{margin:0;font-size:clamp(25px,3vw,34px);letter-spacing:-.03em}.progress{width:min(36vw,360px);height:8px;background:#e4edf6;border-radius:99px;overflow:hidden;margin-bottom:7px}.progress span{display:block;height:100%;width:12.5%;background:linear-gradient(90deg,var(--blue),var(--mint));border-radius:inherit;transition:width .4s}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,330px);gap:18px;max-width:1300px;margin:auto}.board-card,.control-card{background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}.board-card{padding:14px}.board-toolbar{min-height:42px;display:flex;justify-content:space-between;align-items:start;gap:14px;padding:1px 2px 10px}.board-toolbar p{margin:0;color:var(--muted);font-size:14px;line-height:1.4}.canvas-wrap{position:relative;border-radius:15px;overflow:hidden;background:#f4f9ff;touch-action:none;min-height:360px}canvas{display:block;width:100%;height:auto;aspect-ratio:4/3;touch-action:none;cursor:crosshair}.canvas-message{position:absolute;left:50%;top:15px;transform:translate(-50%,-8px);opacity:0;pointer-events:none;background:#12243f;color:#fff;border-radius:99px;padding:8px 14px;font-size:13px;font-weight:800;transition:.2s;white-space:nowrap}.canvas-message.show{opacity:1;transform:translate(-50%,0)}.touch-tip{text-align:center;color:var(--muted);font-size:12px;padding-top:9px}.control-card{padding:18px;display:flex;flex-direction:column;gap:15px}.readout-group{padding-bottom:15px;border-bottom:1px solid var(--line)}.readout-title{display:flex;align-items:center;gap:7px;font-size:14px;font-weight:800}.domain-dot,.range-dot{width:10px;height:10px;border-radius:50%;background:var(--blue)}.range-dot{background:var(--coral)}.direction{margin-left:auto;color:var(--muted);font-size:11px;font-weight:600}.math-readout{font-family:"Cambria Math",Georgia,serif;font-size:29px;margin:8px 0 3px;letter-spacing:.02em}.endpoint-options{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.endpoint-options button,.piece-controls button{border:1px solid var(--line);background:#fff;color:var(--ink);padding:7px 9px;border-radius:9px;font-size:12px;font-weight:700;cursor:pointer}.endpoint-options button.selected,.piece-controls button.selected{background:#e9efff;border-color:#8da8f8;color:#204cc6}.lock-btn{width:100%;margin-top:auto}.feedback{font-size:13px;line-height:1.45;color:var(--muted);min-height:39px}.feedback.good{color:#087d62;font-weight:700}.feedback.bad{color:#bc3e38;font-weight:700}.piece-controls{display:grid;grid-template-columns:1fr 1fr;gap:7px}.piece-controls p{grid-column:1/-1;margin:0;color:var(--muted);font-size:12px}.hidden{display:none!important}.create-controls{font-size:13px;color:var(--muted);line-height:1.4}.create-controls p{margin:0 0 8px}
.complete-screen{text-align:center;max-width:650px;margin:0 auto;padding:70px 20px}.medal-mascot{position:relative;margin:25px auto 30px;width:120px;height:105px}.complete-screen h2{font-size:clamp(38px,7vw,64px);letter-spacing:-.05em;margin:5px}.complete-screen>p{color:var(--muted);font-size:18px;line-height:1.55}.final-score{margin:26px auto;width:190px;padding:16px;border:1px solid var(--line);border-radius:18px;background:#fff;display:flex;flex-direction:column;box-shadow:var(--shadow)}.final-score span{color:var(--muted);font-size:13px}.final-score b{font-size:38px}.complete-actions{justify-content:center}.celebration{font-size:30px;display:flex;justify-content:center;gap:55px;color:var(--yellow)}dialog{width:min(550px,calc(100% - 30px));border:0;border-radius:24px;padding:30px;box-shadow:0 30px 80px rgba(14,35,67,.3);color:var(--ink)}dialog::backdrop{background:rgba(12,27,49,.55);backdrop-filter:blur(4px)}dialog h2{font-size:32px;margin:5px 0 16px}dialog ol{padding-left:22px;color:var(--muted);line-height:1.55}dialog li{margin-bottom:11px}dialog b{color:var(--ink)}.dialog-close{position:absolute;right:15px;top:12px;border:0;background:transparent;font-size:28px;cursor:pointer;color:var(--muted)}
@media(max-width:900px){.hero-art{opacity:.35;right:-18vw}.hero-copy{max-width:590px}.game-layout{grid-template-columns:1fr}.control-card{display:grid;grid-template-columns:1fr 1fr;align-items:start}.lock-btn,.feedback,.piece-controls,.create-controls{grid-column:1/-1}.lock-btn{margin-top:0}.canvas-wrap{min-height:0}.level-preview{position:relative;left:auto;right:auto;bottom:auto;margin-top:60px;flex-wrap:wrap}.level-preview div{min-width:130px}.start-screen{padding-bottom:28px}}
@media(max-width:560px){.topbar{height:58px;padding:0 12px}.brand>span:last-child{display:none}.stat{min-width:48px;padding:0 7px}.start-screen{min-height:calc(100vh - 58px);padding:36px 18px}.hero-copy h1{font-size:45px}.hero-art{top:17%;right:-45vw;width:95vw}.level-preview{margin-top:52px;display:grid;grid-template-columns:1fr 1fr}.level-preview div:last-child{grid-column:1/-1}.game-screen{padding:16px 10px 28px}.mission-head{align-items:start}.progress{width:110px;margin-top:13px}.game-layout{gap:10px}.board-card,.control-card{border-radius:17px}.board-card{padding:8px}.canvas-message{font-size:11px}.touch-tip{display:none}.control-card{padding:13px;gap:10px}.math-readout{font-size:23px}.primary-btn,.secondary-btn{padding:13px 17px}.direction{display:none}}
@media print{.topbar,.complete-actions,.celebration{display:none}.complete-screen{display:block!important}.screen:not(.complete-screen){display:none!important}body{background:#fff}.medal-mascot{margin-top:80px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.zoom-controls{display:flex;gap:5px;margin-left:auto}.zoom-controls .small-btn{min-width:36px;padding:7px 9px}#gameCanvas{transform-origin:center center;transition:transform .18s ease}
.canvas-message{max-width:calc(100% - 24px);white-space:normal;text-align:center}
.brand-logo{width:36px;height:36px;border-radius:11px;object-fit:cover;box-shadow:0 7px 16px rgba(55,103,233,.25)}.hero-logo{position:absolute;width:48%;aspect-ratio:1;object-fit:cover;border-radius:50%;z-index:2;box-shadow:0 24px 60px rgba(22,54,106,.28)}.author-credit{margin-top:15px;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.02em}.complete-screen .author-credit{margin:0 0 22px}
.story-screen{padding:clamp(14px,3vw,36px);min-height:calc(100vh - 68px)}.story-shell{max-width:1180px;margin:auto}.story-stage{position:relative;min-height:min(68vh,690px);border-radius:26px;overflow:hidden;background:#10213a;box-shadow:var(--shadow)}.story-stage>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.story-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,18,40,.92) 0%,rgba(7,18,40,.62) 43%,rgba(7,18,40,.08) 78%)}.story-copy{position:absolute;left:clamp(22px,6vw,72px);bottom:clamp(26px,7vw,76px);width:min(520px,82%);color:#fff}.story-copy .eyebrow{color:#82dfff}.story-copy h1{font-size:clamp(34px,5vw,64px);line-height:1.02;letter-spacing:-.045em;margin:0 0 18px}.story-copy p{font-size:clamp(15px,1.8vw,19px);line-height:1.55;margin:0;color:#e7f1ff}.story-nav{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 4px}.story-actions{display:flex;gap:8px}.story-dots{display:flex;gap:8px}.story-dot{width:9px;height:9px;border:0;border-radius:50%;background:#c8d6e6;padding:0}.story-dot.active{width:28px;border-radius:99px;background:var(--blue)}
@media(max-width:560px){.story-screen{min-height:calc(100vh - 58px);padding:10px}.story-stage{min-height:66vh;border-radius:18px}.story-shade{background:linear-gradient(0deg,rgba(7,18,40,.94) 0%,rgba(7,18,40,.42) 68%,rgba(7,18,40,.05) 100%)}.story-copy{left:20px;bottom:25px;width:calc(100% - 40px)}.story-copy h1{font-size:35px}.story-copy p{font-size:14px}.story-nav{align-items:flex-start}.story-actions{flex-wrap:wrap;justify-content:flex-end}.story-actions .primary-btn,.story-actions .secondary-btn{padding:10px 13px}}
.difficulty-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:650px;margin:26px 0 14px}.difficulty-btn{min-height:98px;padding:16px;text-align:left;border:1px solid var(--line);border-radius:16px;background:#fff;color:var(--ink);cursor:pointer;box-shadow:0 8px 22px rgba(20,49,91,.08);transition:transform .16s,border-color .16s}.difficulty-btn:hover{transform:translateY(-3px);border-color:var(--blue2)}.difficulty-btn b,.difficulty-btn span{display:block}.difficulty-btn b{font-size:20px;margin-bottom:5px}.difficulty-btn span{font-size:12px;line-height:1.35;color:var(--muted)}.difficulty-btn.easy b{color:#16836a}.difficulty-btn.medium b{color:#d27a18}.difficulty-btn.hard b{color:#b54355}@media(max-width:560px){.difficulty-grid{grid-template-columns:1fr}.difficulty-btn{min-height:72px}}

.endpoint-options label{display:grid;gap:.25rem;font-size:.8rem}.endpoint-options input{width:100%;min-width:0;box-sizing:border-box;min-height:44px;font:inherit;padding:.4rem}.endpoint-options input:focus-visible{outline:3px solid #3767e9;outline-offset:2px}