:root{--ink:#17231d;--muted:#6c776f;--paper:#f6f3eb;--card:#fffdf8;--green:#235c41;--lime:#d9ed65;--line:#dad9d0;--danger:#a5483e}*{box-sizing:border-box}body{margin:0;background:#e8e6de;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}.shell{width:min(100%,480px);min-height:100vh;margin:auto;background:var(--paper);padding:0 22px 30px;box-shadow:0 0 50px #1b2b2220}.topbar{height:78px;display:flex;align-items:center;gap:9px;border-bottom:1px solid var(--line)}.topbar div:nth-child(2){display:flex;flex-direction:column;flex:1}.topbar small{color:var(--muted);font-size:11px}.brand-mark{width:38px;height:38px;background:var(--ink);color:var(--lime);display:grid;place-items:center;border-radius:12px;font:700 22px Georgia}.icon-btn{border:1px solid var(--line);background:var(--card);border-radius:12px;width:38px;height:38px;font-size:21px;color:var(--ink)}.view{display:none}.view.active{display:block}.hero{padding:42px 0 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var(--line);border-radius:15px;padding:12px;margin-bottom:9px}.deck-main{display:flex;flex-direction:column;align-items:flex-start;gap:5px;width:100%;border:0;background:transparent;color:var(--ink);padding:0;text-align:left}.deck-main strong{font-size:15px}.deck-main span{font-size:11px;color:var(--muted)}.deck-actions{display:flex;gap:8px;margin-top:12px;padding-top:10px;border-top:1px solid var(--line)}.deck-actions button{border:0;background:#edf0df;color:var(--green);border-radius:9px;padding:8px 12px;font-weight:800;font-size:11px}.deck-actions .danger-link{margin-left:auto;background:transparent;color:var(--danger)}.library-study-actions{padding:3px 0 15px;border-top:1px solid var(--line)}.empty-library{text-align:center;background:var(--card);border:1px dashed var(--line);border-radius:18px;padding:40px 20px}.empty-library>div{font-size:36px;color:var(--green)}.empty-library h3{font:700 23px Georgia;margin:12px 0 5px}.empty-library p{font-size:13px;color:var(--muted)}.mix-list{display:grid;gap:10px;margin:24px 0}.mix-item{display:grid;grid-template-columns:1fr 100px;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:15px;padding:13px}.mix-check{display:flex;align-items:center;gap:10px;min-width:0}.mix-check input{width:20px;height:20px;accent-color:var(--green)}.mix-check span{display:flex;flex-direction:column;min-width:0}.mix-check strong{font-size:14px}.mix-check small{color:var(--muted);font-size:11px}.mix-count span{display:block;font-size:10px;font-weight:800;color:var(--green);margin-bottom:5px}.mix-count input{padding:9px;text-align:center}.study-view{min-height:calc(100vh - 30px);padding-top:20px}.study-head{display:flex;align-items:center;gap:12px;margin-bottom:42px}.progress{height:7px;background:#dddcd4;border-radius:8px;flex:1;overflow:hidden}.progress i{display:block;height:100%;width:0;background:var(--green);transition:.3s}.study-head span{font-size:12px;font-weight:700}.hint{font-size:12px!important}.flashcard{height:460px;margin:20px 0;position:relative;transform-style:preserve-3d;transition:transform .5s;cursor:pointer;outline:none}.flashcard.flipped{transform:rotateY(180deg)}.face{position:absolute;inset:0;backface-visibility:hidden;border-radius:23px;padding:26px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;box-shadow:0 15px 35px #1c282118;border:1px solid var(--line);background:var(--card)}.face small{font-weight:900;letter-spacing:.17em;color:var(--green)}.face h2{font:700 27px/1.25 Georgia;margin:auto 0}.face p{font-size:18px;line-height:1.45;margin:8px 0}.face span{font-size:11px;color:var(--muted)}.study-meta{margin-top:12px;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.back{transform:rotateY(180deg);background:var(--ink);color:white;border-color:var(--ink)}.back small{color:var(--lime)}.back span{color:#bdc5bf}.back-content{width:100%;margin:auto 0;overflow-y:auto;padding:5px 3px;max-height:345px}.study-detail,.study-source{text-align:left;font-size:12px;line-height:1.45;margin-top:12px;padding-top:10px;border-top:1px solid #ffffff1e;color:#d8dfda}.study-source{color:var(--lime)}.rating{text-align:center}.rating.hidden{visibility:hidden}.rating>div{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.rating button{padding:13px 5px;border:1px solid var(--line);border-radius:12px;background:var(--card);font-weight:750}.done{text-align:center;padding-top:100px}.success{margin:0 auto 25px;width:70px;height:70px;border-radius:50%;display:grid;place-items:center;background:var(--lime);font-size:32px}.done h2{font:700 38px Georgia;margin:8px}.score-summary{display:flex;justify-content:center;gap:14px;margin:30px 0}.score-summary span{background:var(--card);padding:12px;border:1px solid var(--line);border-radius:12px;font-size:12px}@media(max-width:370px){.hero h1{font-size:34px}.flashcard{height:420px}.context-grid{grid-template-columns:1fr}.context-grid .wide{grid-column:auto}.mix-item{grid-template-columns:1fr 86px}}