:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#11243c;background:#f3f6f8;font-size:16px}*{box-sizing:border-box}body{margin:0}button,select{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible{outline:3px solid #118a92;outline-offset:3px}button:disabled{cursor:not-allowed;opacity:.53}.app-shell{min-height:100vh}.topbar{height:74px;background:#11243c;color:#f7fbfc;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(18px,3vw,50px);gap:18px}.brand{display:flex;align-items:center;gap:12px;font-size:1.12rem;letter-spacing:-.025em;white-space:nowrap}.brand strong{font-weight:800}.brand-mark{width:36px;height:36px;border-radius:11px;background:#b7ef68;color:#11243c;display:grid;place-items:center;font-weight:900;font-size:1.35rem}.top-actions{display:flex;align-items:center;gap:20px}.bank-count{color:#acc0ce;font-size:.84rem}.teacher-toggle{color:#ebf8ff;background:#253c55;border:1px solid #4b6276;border-radius:9px;padding:9px 13px;font-size:.84rem}.teacher-toggle[aria-pressed=true]{background:#b7ef68;border-color:#b7ef68;color:#11243c;font-weight:800}.columns{display:grid;grid-template-columns:238px minmax(0,1fr) 260px;max-width:1600px;margin:auto;min-height:calc(100vh - 74px)}.nav{background:#e8eef2;padding:38px 16px 28px;display:flex;flex-direction:column;align-items:stretch;gap:5px;border-right:1px solid #d4dfe6}.nav-label,.eyebrow,.side-kicker{font-size:.75rem;font-weight:850;letter-spacing:.11em;color:#47657b}.nav-label{padding:0 14px;margin-bottom:13px}.nav-button{border:0;border-radius:11px;background:transparent;color:#315067;font-weight:650;text-align:left;padding:13px 13px;display:flex;align-items:center;gap:14px;min-height:49px}.nav-button span{font-size:.81rem;color:#7490a2;min-width:19px}.nav-button:hover{background:#dce7eb}.nav-button.active{background:#11243c;color:#fff}.nav-button.active span{color:#b7ef68}.nav-rule{border-top:1px solid #cbd9e2;margin:13px 5px}.nav-note{margin-top:auto;padding:18px 13px 0;color:#668193;font-size:.83rem;line-height:1.55}.main{padding:40px clamp(20px,3.2vw,55px) 85px;min-width:0}.work-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;max-width:900px;margin:0 auto 26px}.work-heading h1{font-size:clamp(1.65rem,2.5vw,2.3rem);line-height:1.14;letter-spacing:-.035em;margin:10px 0 8px}.work-heading p{color:#526c7c;line-height:1.55;margin:0;max-width:650px}.session-pill{font-size:.78rem;white-space:nowrap;background:#e5f2ee;color:#216550;padding:9px 13px;border-radius:100px;font-weight:700;margin-top:3px}.side{padding:42px 20px 30px 0;display:flex;flex-direction:column;gap:14px}.side-card{border:1px solid #dce4e8;background:#fff;padding:24px 22px;border-radius:15px;box-shadow:0 5px 20px #263e5308}.side-card h2{margin:14px 0 7px;font-size:1.18rem;letter-spacing:-.02em}.side-card p{line-height:1.55;color:#547082;margin:7px 0}.side-card.subtle{background:#eaf1f4}.side-card .tiny{font-size:.78rem;margin-top:18px;color:#607987}.controls{max-width:900px;margin:0 auto 16px;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap}.select-wrap{display:flex;align-items:center;gap:9px;font-size:.87rem;color:#506878;font-weight:700}.select-wrap select{border:1px solid #cbd9e2;background:#fff;border-radius:9px;color:#11243c;padding:9px 31px 9px 10px;max-width:245px}.question-card,.feedback-card,.progress-card{max-width:900px;margin:0 auto 17px;border:1px solid #d9e3e8;background:#fff;border-radius:17px;box-shadow:0 8px 25px #233a5008}.question-card{overflow:hidden}.question-top{padding:24px clamp(20px,3vw,32px);border-bottom:1px solid #e1e9ed}.meta-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.tag{display:inline-block;background:#e5eff4;color:#225675;border-radius:7px;font-weight:750;padding:6px 9px;font-size:.79rem}.tag.word{background:#e9f5d7;color:#466715}.tag.max{background:#11243c;color:#fff}.question-top h2{font-size:clamp(1.22rem,2vw,1.55rem);line-height:1.37;letter-spacing:-.02em;margin:18px 0 0}.question-top p{font-size:.92rem;color:#637c89;margin:12px 0 0}.question-body{padding:22px clamp(20px,3vw,32px) 25px}.instruction{font-weight:730;font-size:.92rem;margin:0 0 14px}.option-list{display:grid;gap:10px}.option{width:100%;min-height:58px;background:#fff;border:1.5px solid #d8e2e8;border-radius:11px;text-align:left;display:flex;align-items:flex-start;gap:13px;padding:14px 16px;color:#20384c;line-height:1.5}.option:hover{border-color:#6ca5ad;background:#f8fbfb}.option.selected{border-color:#167f89;background:#eaf8f6;box-shadow:inset 4px 0 #16848e}.option:disabled{opacity:1;cursor:default}.option-letter{display:grid;place-items:center;flex:none;width:27px;height:27px;border-radius:7px;background:#e9eff2;color:#48677b;font-weight:800;font-size:.85rem}.option.selected .option-letter{background:#16848e;color:#fff}.option-text{flex:1}.action-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-top:22px}.primary,.secondary,.text-button{min-height:43px;border-radius:9px;padding:10px 16px;font-size:.92rem;font-weight:750}.primary{background:#11243c;border:1px solid #11243c;color:#fff}.primary:hover{background:#253f5b}.secondary{background:#fff;border:1px solid #c9d7df;color:#254a63}.secondary:hover{background:#edf4f5}.text-button{border:none;background:transparent;color:#235e76;padding-inline:8px}.action-spacer{flex:1}.feedback-card{padding:23px clamp(20px,3vw,32px);border-color:#b8d8c3;background:#f9fcf7}.feedback-card h3{font-size:1.15rem;margin:0 0 6px}.feedback-card .result-line{color:#356451;font-weight:750;margin-bottom:17px}.feedback-item{display:grid;grid-template-columns:28px 1fr;gap:10px;border-top:1px solid #dfebe2;padding:13px 0}.feedback-item:last-child{padding-bottom:0}.feedback-icon{font-weight:850;color:#396f46}.feedback-item.missed .feedback-icon{color:#ad6a2c}.feedback-item p{margin:4px 0 0;color:#5b7380;line-height:1.45;font-size:.91rem}.feedback-item b{font-size:.92rem}.notice{font-size:.85rem;color:#5d7684;margin:14px 0 0;line-height:1.45}.progress-grid{max-width:900px;margin:0 auto 20px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{background:#11243c;color:#fff;border-radius:14px;padding:20px}.metric strong{display:block;font-size:1.8rem;letter-spacing:-.04em}.metric span{font-size:.84rem;color:#b9cbd5}.progress-card{padding:22px clamp(20px,3vw,32px)}.progress-card h2{font-size:1.2rem;margin:0 0 14px}.topic-row{display:grid;grid-template-columns:minmax(115px,1.4fr) 2fr 65px;align-items:center;gap:10px;margin:13px 0;color:#3a5667;font-size:.89rem}.bar{height:10px;background:#e8eff2;border-radius:100px;overflow:hidden}.bar>div{height:100%;background:#21a6a1;border-radius:100px}.empty{padding:35px;text-align:center;color:#546f7d}.quick-banner{max-width:900px;margin:0 auto 17px;padding:14px 18px;background:#eaf1e2;border:1px solid #d0e4bc;border-radius:11px;color:#416218;font-size:.91rem}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#11243c;color:white;border-radius:9px;padding:10px 16px;font-size:.85rem;box-shadow:0 8px 22px #0003;opacity:0;pointer-events:none;transition:opacity .2s}.toast.show{opacity:1}@media(max-width:1160px){.columns{grid-template-columns:215px minmax(0,1fr)}.side{display:none}}@media(max-width:750px){.topbar{height:auto;min-height:65px;padding:12px 17px}.brand{font-size:.97rem}.brand-mark{width:31px;height:31px}.bank-count{display:none}.teacher-toggle{font-size:.76rem;padding:8px}.columns{display:block}.nav{padding:10px 14px;display:flex;flex-direction:row;overflow-x:auto;gap:5px;border-right:0;border-bottom:1px solid #d7e2e8}.nav-label,.nav-rule,.nav-note{display:none}.nav-button{white-space:nowrap;flex:none;min-height:42px;padding:10px 12px;font-size:.84rem;gap:7px}.main{padding:25px 15px 60px}.work-heading{display:block;margin-bottom:20px}.session-pill{display:inline-block;margin-top:14px}.progress-grid{grid-template-columns:repeat(3,1fr)}.metric{padding:12px}.metric strong{font-size:1.35rem}.metric span{font-size:.73rem}.topic-row{grid-template-columns:1fr 1.2fr 45px}.select-wrap select{max-width:170px}}@media(max-width:420px){.brand{font-size:.84rem}.teacher-toggle{font-size:.71rem}.question-top,.question-body{padding-left:17px;padding-right:17px}.progress-grid{gap:5px}.metric span{font-size:.67rem}}@media(prefers-reduced-motion:reduce){.toast{transition:none}}