:root{color:#f8fbff;background:#101726;font-family:Inter,ui-rounded,Nunito,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button{border:0;font:inherit}.app-shell{position:relative;min-height:100vh;overflow:hidden;padding:clamp(16px,3vw,34px);background:radial-gradient(circle at top left,rgba(61,141,211,.34),transparent 34%),linear-gradient(135deg,#142033,#17253b 48%,#213047)}.starscape{position:absolute;inset:0;pointer-events:none;opacity:.75;background-image:radial-gradient(circle,rgba(255,255,255,.85) 1px,transparent 1.5px),radial-gradient(circle,rgba(255,210,122,.9) 1px,transparent 1.5px);background-position:12px 20px,90px 80px;background-size:120px 110px,180px 160px}.topbar,.mission-grid{position:relative;z-index:1}.topbar{display:flex;align-items:center;justify-content:space-between;gap:18px;max-width:1180px;margin:0 auto 22px}.brand{display:flex;align-items:center;gap:12px}.brand h1,.brand p,.task-header h2,.mission-text{margin:0}.brand h1{font-size:clamp(1.45rem,4vw,2.6rem)}.brand p,.eyebrow,.stat span,.mission-text,.progress-line span{color:#b9d4ed}.stats{display:grid;grid-template-columns:repeat(3,minmax(92px,1fr));gap:10px}.stat{display:grid;grid-template-columns:24px 1fr;gap:2px 8px;align-items:center;min-height:64px;padding:10px 12px;border:1px solid rgba(255,255,255,.12);border-radius:8px;background:#ffffff14}.stat svg{grid-row:span 2;color:#ffd66e}.stat strong{font-size:1.25rem}.stat.is-celebrating{animation:stat-pop 1.1s ease both;border-color:#ffdd75c7;background:#ffd66e2e}.mission-grid{display:grid;grid-template-columns:minmax(220px,300px) minmax(0,1fr);gap:18px;max-width:1180px;margin:0 auto}.mission-panel,.workbench{border:1px solid rgba(255,255,255,.12);border-radius:8px;background:#09101eb8;box-shadow:0 22px 60px #0000003d}.mission-panel{display:flex;flex-direction:column;gap:16px;padding:18px}.level-orbit{display:grid;place-items:center;align-self:center;width:152px;aspect-ratio:1;border:3px solid #74d4ff;border-radius:50%;background:radial-gradient(circle,#263f5f,#132238 70%)}.level-orbit span{color:#b9d4ed;text-transform:uppercase;font-size:.78rem;font-weight:800}.level-orbit strong{color:#ffdd75;font-size:4rem;line-height:.9}.progress-line{display:flex;justify-content:space-between;border-bottom:1px solid rgba(255,255,255,.12);padding-bottom:10px}.badge-row{display:flex;flex-wrap:wrap;gap:8px;min-height:36px}.badge,.empty-badge{display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:6px 9px;border-radius:8px;background:#2a4b62;color:#f9fbff;font-size:.88rem}.ghost-button,.icon-button,.modal-actions button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border-radius:8px;background:#244158;color:#f8fbff;cursor:pointer}.ghost-button:hover,.icon-button:hover,.modal-actions button:hover,.keypad button:hover{filter:brightness(1.08)}.workbench{position:relative;padding:clamp(16px,3vw,26px)}.success-burst{position:absolute;z-index:3;top:50%;left:50%;display:grid;place-items:center;width:min(360px,calc(100% - 28px));min-height:180px;padding:22px;border:3px solid #ffd66e;border-radius:8px;background:radial-gradient(circle at 50% 18%,#ffeea2fa,#ffc253eb 48%,#2d506df5);color:#132033;text-align:center;pointer-events:none;box-shadow:0 24px 70px #00000061;transform:translate(-50%,-50%);animation:reward-in 1.45s ease both}.success-burst strong{font-size:clamp(1.65rem,5vw,2.6rem);line-height:1.05}.success-burst span{font-size:clamp(1.35rem,4vw,2rem);font-weight:950}.success-burst small{color:#f8fbff;font-size:1.05rem;font-weight:900}.burst-stars{position:absolute;inset:0;overflow:hidden;color:#fff8be;font-size:2.2rem;font-weight:950}.burst-stars span{position:absolute;animation:star-fly 1.2s ease-out both}.burst-stars span:nth-child(1){top:14%;left:18%}.burst-stars span:nth-child(2){top:18%;right:18%;animation-delay:.08s}.burst-stars span:nth-child(3){bottom:16%;left:22%;animation-delay:.16s}.burst-stars span:nth-child(4){right:23%;bottom:14%;animation-delay:.22s}.task-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.eyebrow{display:block;margin-bottom:3px;font-size:.78rem;font-weight:900;letter-spacing:0;text-transform:uppercase}.task-header h2{font-size:clamp(1.3rem,3vw,2.1rem)}.icon-button{width:48px}.addition-board{--cell: clamp(42px, 9vw, 74px);display:grid;grid-template-columns:32px repeat(var(--columns),var(--cell));justify-content:center;gap:7px;width:100%;margin:10px auto 16px;padding:clamp(14px,3vw,24px);border-radius:8px;background:#f7fbff;color:#142033}.carry-row,.number-row{display:contents}.operator,.operator-space{display:grid;place-items:center;min-height:var(--cell);font-size:clamp(1.6rem,5vw,2.6rem);font-weight:900}.carry-cell,.digit-cell{display:grid;place-items:center;width:var(--cell);height:var(--cell);border-radius:8px;font-variant-numeric:tabular-nums}.carry-cell{height:30px;color:#c75b12;font-weight:900}.digit-cell{background:#e7f0f7;font-size:clamp(1.65rem,6vw,3.1rem);font-weight:900}.digit-cell.fixed:empty{background:transparent}.result-line{grid-column:1 / -1;height:4px;border-radius:999px;background:#142033}.input-cell{border:3px solid #bed0dc;background:#fff;color:#142033;cursor:pointer}.input-cell.active{border-color:#f3b53f;box-shadow:0 0 0 4px #f3b53f3d}.input-cell.had-mistake{border-color:#f07f5f}.feedback{min-height:30px;margin:0 0 16px;color:#dcecff;font-weight:800;text-align:center}.keypad{display:grid;grid-template-columns:repeat(5,minmax(58px,1fr));gap:10px}.keypad button{min-height:62px;border-radius:8px;background:#fee28a;color:#172033;font-size:1.35rem;font-weight:950;cursor:pointer}.keypad .wide{grid-column:span 2;background:#95d7ff}.modal-backdrop{position:fixed;z-index:5;inset:0;display:grid;place-items:center;padding:16px;background:#03080fb3}.modal{width:min(420px,100%);padding:22px;border-radius:8px;background:#f8fbff;color:#152033}.modal h2,.modal p{margin-top:0}.modal-actions{display:flex;gap:10px;justify-content:flex-end}.modal-actions button{padding:0 14px}.modal-actions .danger{background:#b93c2e}@keyframes reward-in{0%{opacity:0;transform:translate(-50%,-45%) scale(.72)}18%{opacity:1;transform:translate(-50%,-50%) scale(1.08)}62%{opacity:1;transform:translate(-50%,-50%) scale(1)}to{opacity:0;transform:translate(-50%,-56%) scale(.95)}}@keyframes star-fly{0%{opacity:0;transform:translateY(16px) scale(.6) rotate(0)}20%{opacity:1}to{opacity:0;transform:translateY(-22px) scale(1.35) rotate(28deg)}}@keyframes stat-pop{0%{transform:scale(1)}22%{transform:scale(1.08)}to{transform:scale(1)}}@media(max-width:820px){.topbar,.mission-grid{grid-template-columns:1fr}.topbar{align-items:stretch;flex-direction:column}.stats{grid-template-columns:repeat(3,1fr)}.mission-panel{display:grid;grid-template-columns:auto 1fr;align-items:center}.level-orbit{grid-row:span 4;width:118px}.badge-row,.ghost-button{grid-column:1 / -1}}@media(max-width:560px){.app-shell{padding:12px}.stats,.keypad{grid-template-columns:repeat(3,1fr)}.mission-panel{grid-template-columns:1fr}.level-orbit{grid-row:auto;width:112px}.addition-board{--cell: min(13vw, 56px);gap:5px;grid-template-columns:24px repeat(var(--columns),var(--cell));padding:10px}.keypad .wide{grid-column:span 1}}