:root{--bg:#f6fbff;--card:#fff;--text:#0b376f;--muted:#6d7d8d;--line:#dceaf2;--primary:#0b4a8b;--primary2:#eaf5ff;--green:#16b85f;--green2:#eaf9ef;--pink:#ff3d75;--yellow:#ffbd08;--danger:#d83d62}
*{box-sizing:border-box}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:linear-gradient(145deg,#f7fcff 0%,#fffdf6 48%,#f4fff7 100%);color:var(--text)}
button,input,select,textarea{font:inherit}.app{display:flex;min-height:100vh}.side{width:250px;background:#fff;border-right:1px solid var(--line);padding:20px 14px;position:sticky;top:0;height:100vh;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;scrollbar-gutter:stable;flex:0 0 250px;-webkit-overflow-scrolling:touch}
.logo{font-size:22px;font-weight:900;padding:8px 10px 22px;color:var(--primary)}.logo small{display:block;font-size:11px;font-weight:700;color:var(--green);margin-top:2px}.nav{display:grid;gap:7px;padding-bottom:24px}.nav button{border:0;background:transparent;text-align:left;padding:12px 13px;border-radius:12px;color:#53677c;cursor:pointer}.nav button.active,.nav button:hover{background:var(--primary2);color:var(--primary);font-weight:800}.main{width:100%;max-width:1250px;margin:auto;padding:28px}.page{display:none}.page.active{display:block}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:22px}.top h1{margin:0;font-size:29px;color:#103e74}.muted{color:var(--muted)}.badge{font-size:12px;padding:6px 9px;border-radius:99px;background:var(--green2);color:#07874a;font-weight:800}
.grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:0 8px 26px #0b4a8b0b}.card h2{margin:0 0 14px;font-size:18px}.subjects{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.subject{border-radius:15px;padding:16px;cursor:pointer;border:1px solid transparent}.subject:hover{border-color:#bcd9e9;transform:translateY(-1px)}.subject b{display:block;margin-bottom:4px}.list{display:grid;gap:9px}.item{padding:12px 13px;background:#f8fcff;border-radius:12px;border-left:4px solid var(--green)}.item strong{display:block}.item small{color:var(--muted)}
.primary,.secondary,.danger{border:0;border-radius:11px;padding:10px 13px;font-weight:800;cursor:pointer}.primary{background:linear-gradient(135deg,#0b4a8b,#1267b5);color:#fff;box-shadow:0 5px 14px #0b4a8b20}.secondary{background:var(--primary2);color:var(--primary)}.danger{background:#fff0f4;color:var(--danger)}.quick{display:flex;gap:9px;flex-wrap:wrap}.input,select,textarea{width:100%;padding:11px 12px;border:1px solid #d6e4ed;border-radius:10px;background:#fff;margin-bottom:10px;color:var(--text)}textarea{min-height:300px;resize:vertical}.notes{display:grid;grid-template-columns:285px 1fr;gap:16px}.note{padding:11px;border:1px solid var(--line);border-radius:11px;cursor:pointer;margin-bottom:8px;background:#fff}.note.active{border-color:#60b9df;background:#effaff}.row{display:flex;gap:9px;align-items:center}.row>*{flex:1}.row .fit{flex:0 0 auto}.drop{border:2px dashed #a9d4e8;border-radius:16px;padding:25px;text-align:center;background:#fbfeff}.file{display:flex;justify-content:space-between;gap:10px;align-items:center;background:#f8fcff;padding:12px;border-radius:12px;margin-top:9px}.file-actions{display:flex;gap:6px}.empty{padding:16px;background:#f8fcff;border-radius:12px;color:var(--muted)}.modal{display:none;position:fixed;inset:0;background:#092d5580;z-index:20;padding:20px;align-items:center;justify-content:center}.modal.open{display:flex}.modalbox{background:#fff;border-radius:18px;padding:20px;max-width:560px;width:100%;max-height:90vh;overflow:auto}.colorpick{height:42px;padding:4px}.subjectManage{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center;padding:10px;border-bottom:1px solid var(--line)}.flashcards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.flash{padding:20px;border-radius:15px;background:#eef9ff;min-height:130px;cursor:pointer}.feedback-good{background:#edf9f0;border:1px solid #bfe4c8;padding:14px;border-radius:12px;color:#245b31}.feedback-bad{background:#fff4f5;border:1px solid #f0c8cd;padding:14px;border-radius:12px;color:#7b3340}.quiz-answer{background:#eef9ff;padding:12px;border-radius:10px;margin-top:8px}.quiz-good{border-left:4px solid var(--green);padding-left:12px}.quiz-bad{border-left:4px solid var(--pink);padding-left:12px}.resultRow{padding:12px 0;border-bottom:1px solid var(--line)}.resultRow:last-child{border-bottom:0}
.authGate{position:fixed;inset:0;z-index:100;background:radial-gradient(circle at 20% 15%,#cbeeff 0,transparent 35%),radial-gradient(circle at 80% 80%,#d9f6d4 0,transparent 35%),#f9fcff;display:flex;align-items:center;justify-content:center;padding:20px}.authGate.hidden{display:none}.authBox{width:min(460px,100%);background:#fff;border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:0 20px 65px #0b4a8b1b}.authLogo{text-align:center;font-size:30px;font-weight:900;margin-bottom:2px;color:var(--primary)}.brandTagline{text-align:center;color:var(--green);font-weight:800;margin-bottom:8px}.authTabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:18px 0}.authTabs button{border:0;border-radius:11px;padding:11px;background:#edf6fb;color:#53677c;font-weight:800;cursor:pointer}.authTabs button.active{background:var(--primary);color:#fff}.authPane{display:none}.authPane.active{display:block}.authError{min-height:22px;color:#c53d58;font-size:14px;margin-top:8px}.userPanel{margin:0 8px 16px;padding:10px 11px;border-radius:12px;background:#f1f9fd}.userPanel b{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.userPanel button{margin-top:8px;width:100%;border:0;background:#e6f4fb;color:var(--primary);border-radius:9px;padding:8px;font-weight:800;cursor:pointer}
.mindWrap{overflow:auto;padding:10px}.mindMap{min-width:720px;display:grid;grid-template-columns:1fr 1.2fr 1fr;gap:18px;align-items:start}.mindCenter{background:linear-gradient(135deg,var(--primary),#1472c5);color:#fff;border-radius:18px;padding:18px;text-align:center;font-weight:900;position:sticky;top:10px}.mindBranch{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px;margin-bottom:12px}.mindBranch h3{margin:0 0 8px;font-size:16px}.mindLeaf{padding:8px 10px;border-radius:10px;background:#f8fcff;margin-top:7px;font-size:14px}.mindColumn{min-width:0}.mindToolbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.flipGrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.flipCard{perspective:1000px;min-height:220px;cursor:pointer}.flipInner{position:relative;width:100%;min-height:220px;transition:transform .45s;transform-style:preserve-3d}.flipCard.flipped .flipInner{transform:rotateY(180deg)}.flipFace{position:absolute;inset:0;backface-visibility:hidden;border:1px solid var(--line);border-radius:18px;padding:18px;background:#fff;display:flex;flex-direction:column;justify-content:space-between}.flipBack{transform:rotateY(180deg);background:#eef9ff}.flipLabel{font-size:12px;font-weight:800;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.flipText{font-size:18px;line-height:1.45;margin:12px 0}.gameGrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.gameCard{border:1px solid var(--line);border-radius:16px;padding:16px;background:#fff;cursor:pointer}.gameCard:hover{border-color:#b9d8e8}.gamePlay{display:none}.gamePlay.active{display:block}.choiceGrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.choiceBtn{border:1px solid var(--line);background:#fff;border-radius:12px;padding:12px;cursor:pointer}.choiceBtn.correct{background:#edf9f0;border-color:#bfe4c8}.choiceBtn.wrong{background:#fff1f3;border-color:#f0c8cd}.gamePrompt{font-size:22px;font-weight:850;line-height:1.35;margin:12px 0 18px}.gameScore{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}.status{position:fixed;right:18px;bottom:18px;background:#083b70;color:#fff;padding:11px 14px;border-radius:12px;opacity:0;transform:translateY(10px);transition:.2s;pointer-events:none;z-index:30}.status.show{opacity:1;transform:translateY(0)}
@media(max-width:800px){.flipGrid,.gameGrid,.choiceGrid{grid-template-columns:1fr}.app{display:block}.side{width:100%;height:auto;position:static;border-right:0;border-bottom:1px solid var(--line);padding:10px;overflow:visible;flex:none}.logo{padding:5px 8px 9px}.nav{display:flex;overflow-x:auto;overflow-y:hidden;padding-bottom:4px}.nav button{white-space:nowrap}.main{padding:16px}.grid,.notes{grid-template-columns:1fr}.subjects,.flashcards{grid-template-columns:1fr}.top h1{font-size:24px}.row{flex-wrap:wrap}}