:root{--ink:#173c39;--teal:#0d625d;--mint:#dff7ef;--sun:#ffd45c;--coral:#ff755f;--paper:#fffdf7;--line:#d8e9e5;--shadow:0 14px 34px #173c391b}*{box-sizing:border-box}html{font-family:ui-rounded,"Avenir Next",system-ui,sans-serif;color:var(--ink);background:linear-gradient(145deg,#ecfbf6,#fff9df 55%,#ffe9e4)}body{margin:0;min-height:100vh}button,select{font:inherit}.topbar{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:14px max(4vw,18px);background:#ffffffdd;backdrop-filter:blur(14px);border-bottom:1px solid #fff}.brand{font-weight:950;font-size:1.25rem;color:var(--teal);text-decoration:none}.controls{display:flex;gap:8px;align-items:center}.controls button,.controls select,.level-row select{border:1px solid var(--line);background:#fff;border-radius:13px;padding:10px 12px;font-weight:800;color:var(--ink)}main{max-width:1080px;margin:auto;padding:36px 20px 70px}.welcome{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:22px}.eyebrow{letter-spacing:.14em;font-weight:900;font-size:.76rem;color:var(--teal);margin:0 0 7px}.welcome h1{margin:0;font-size:clamp(2rem,5vw,3.5rem);line-height:1.02}.score{width:112px;height:112px;border-radius:32px;background:var(--teal);color:#fff;display:grid;place-content:center;text-align:center;box-shadow:var(--shadow)}.score strong{font-size:2rem}.score span{color:var(--sun)}.score small{font-size:.72rem}.level-row{display:flex;align-items:center;gap:12px;background:#fff;border-radius:18px;padding:12px 16px;box-shadow:var(--shadow);margin-bottom:18px}.level-row label{font-weight:900}.level-row select{margin-left:auto}.subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.subject{border:0;border-radius:24px;padding:19px;text-align:left;min-height:180px;cursor:pointer;color:var(--ink);box-shadow:var(--shadow);transition:.18s transform}.subject:hover,.subject:focus-visible{transform:translateY(-3px);outline:4px solid #0d625d22}.subject:nth-child(4n+1){background:#d9f5eb}.subject:nth-child(4n+2){background:#fff0b8}.subject:nth-child(4n+3){background:#ffe0d9}.subject:nth-child(4n){background:#dcecff}.subject .icon{display:block;font-size:42px;margin-bottom:17px}.subject strong{font-size:1.1rem;display:block}.subject small{display:block;margin-top:8px;line-height:1.4;color:#4c6d69}dialog{border:0;border-radius:26px;width:min(650px,calc(100% - 24px));max-height:calc(100vh - 24px);padding:22px;background:var(--paper);box-shadow:0 30px 80px #102d2a55}dialog::backdrop{background:#102d2a88;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:12px;position:sticky;top:-22px;background:var(--paper);padding:10px 0;z-index:2}.dialog-head h2{margin:0}.dialog-head small{font-weight:900;color:var(--teal)}.close{width:44px;height:44px;border:0;border-radius:50%;font-size:24px;background:#e6f0ed;cursor:pointer}.question{text-align:center;padding:20px}.question .visual{font-size:70px}.question h3{font-size:1.45rem}.answers{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.answers button,.action{border:2px solid var(--line);background:#fff;border-radius:16px;padding:14px;font-weight:850;cursor:pointer}.answers button.correct{border-color:#159570;background:#e1f8ed}.answers button.wrong{border-color:#df604d;background:#fff0ed}.actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.action.primary{background:var(--teal);color:#fff;border-color:var(--teal)}.feedback{min-height:28px;font-weight:900;color:var(--teal)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat{background:var(--mint);border-radius:18px;padding:18px}.stat strong{font-size:1.8rem;display:block}.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,20px);opacity:0;background:var(--ink);color:#fff;border-radius:14px;padding:12px 18px;transition:.2s;pointer-events:none}.toast.show{opacity:1;transform:translate(-50%,0)}@media(max-width:800px){.subjects{grid-template-columns:repeat(2,1fr)}}@media(max-width:540px){.topbar{align-items:flex-start}.controls{flex-wrap:wrap;justify-content:flex-end}.brand{max-width:120px}.welcome{align-items:flex-start}.score{width:90px;height:90px;border-radius:25px}.subjects{gap:10px}.subject{min-height:160px;padding:15px}.level-row{align-items:stretch;flex-direction:column}.level-row select{margin:0}.answers{grid-template-columns:1fr}}


/* v44 subject choices + install panel */
.subject-wrap{position:relative;display:grid;min-width:0}.subject-wrap>.subject{width:100%}.quick-puzzle{position:absolute;right:12px;bottom:10px;min-height:34px;border:1px solid #cfe8e1;border-radius:999px;background:#f4fcfa;color:#0d625d;padding:5px 10px;font:inherit;font-size:.78rem;font-weight:850;cursor:pointer;z-index:2}.app-install-panel{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:14px 0 18px;padding:14px 16px;border:1px solid #cfe8e1;border-radius:18px;background:#f4fcfa}.app-install-panel>div:first-child{display:grid;gap:3px}.app-install-panel small{color:#4c6d69}.app-install-actions{display:flex;gap:8px;flex-wrap:wrap}.app-install-actions button{min-height:44px;border:1px solid #0d625d;border-radius:12px;background:#fff;color:#0d625d;padding:8px 12px;font:inherit;font-weight:850;cursor:pointer}.install-help{max-width:620px;margin:0 auto;text-align:center;line-height:1.65}.install-icon{font-size:4rem;margin:12px 0}@media(max-width:700px){.app-install-panel{display:grid}.app-install-actions{display:grid;grid-template-columns:1fr 1fr}.app-install-actions button{width:100%}}@media(max-width:420px){.app-install-actions{grid-template-columns:1fr}.quick-puzzle{position:static;margin:-4px 10px 10px;justify-self:stretch}.subject-wrap{border-radius:18px;overflow:hidden}}

/* v48 world-class learning shell */
.progress-panel{margin:14px 0;padding:14px;border:1px solid #dce9e6;border-radius:16px;background:#fff}.progress-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px}.metric{padding:12px;border-radius:14px;background:#f3faf8}.metric strong{display:block;font-size:1.25rem}.mastery-bar{height:10px;background:#e4ecea;border-radius:999px;overflow:hidden}.mastery-bar>i{display:block;height:100%;background:currentColor}.badge-row{display:flex;gap:8px;flex-wrap:wrap}.badge{padding:7px 10px;border-radius:999px;background:#fff3c9}.access-gate{max-width:560px;margin:12vh auto;padding:24px;border-radius:22px;background:#fff;box-shadow:0 20px 70px #0002;text-align:center}.admin-table{width:100%;border-collapse:collapse}.admin-table td,.admin-table th{padding:9px;border-bottom:1px solid #e7eeee;text-align:left}.simulation-card{padding:14px;border:1px solid #dce9e6;border-radius:16px;margin:12px 0}.sim-stage{min-height:110px;display:grid;place-items:center;font-size:2.5rem;background:linear-gradient(135deg,#f5fbfa,#fff8df);border-radius:14px}.parent-tools{display:grid;gap:12px}.parent-tools input,.parent-tools select{padding:10px;border:1px solid #ccdcd8;border-radius:10px}