:root{--bg: #0f1117;--bg-elev: #171a22;--bg-elev-2: #1f232e;--border: #2a2f3a;--text: #e6e8ee;--text-dim: #9aa3b2;--accent: #6366f1;--accent-hover: #4f52d6;--green: #22c55e;--amber: #f59e0b;--red: #ef4444;--radius: 10px;--radius-sm: 6px;font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5}button{font:inherit;cursor:pointer;border:none;border-radius:var(--radius-sm);padding:8px 14px;background:var(--bg-elev-2);color:var(--text);transition:background .15s ease,opacity .15s ease}button:hover{background:var(--border)}button.primary{background:var(--accent);color:#fff}button.primary:hover{background:var(--accent-hover)}button:disabled{opacity:.5;cursor:not-allowed}input[type=text]{font:inherit;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;width:100%}input[type=text]:focus{outline:none;border-color:var(--accent)}.app{display:grid;grid-template-columns:300px 1fr;height:100vh}.topbar,.backdrop{display:none}.sidebar{background:var(--bg-elev);border-right:1px solid var(--border);overflow-y:auto;padding:16px}.sidebar-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.sidebar-head h1{font-size:18px;margin:0;letter-spacing:-.02em}.close-drawer{display:none}.icon-btn{background:transparent;font-size:20px;padding:6px 10px;line-height:1}.new-folder-btn{width:100%;margin-bottom:16px}.main{overflow-y:auto;padding:32px}.favorites{margin-bottom:16px;padding-bottom:12px;border-bottom:1px solid var(--border)}.section-label{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-dim);margin-bottom:8px}.fav-row{display:flex;align-items:center;gap:8px;padding:6px;border-radius:var(--radius-sm)}.fav-row:hover{background:var(--bg-elev-2)}.fav-name{flex:1;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:500}.fav-actions{display:flex;gap:6px;flex-shrink:0}.study-btn{background:var(--accent);color:#fff;font-size:13px;padding:6px 12px;white-space:nowrap}.study-btn:hover{background:var(--accent-hover)}.cram-btn{font-size:13px;padding:6px 12px;white-space:nowrap}.fav-toggle{background:transparent;padding:0 2px;font-size:14px;color:var(--text-dim);width:18px}.fav-toggle.on{color:var(--amber)}.study-mini{font-size:13px}.tree-node{-webkit-user-select:none;user-select:none}.tree-row{display:flex;align-items:center;gap:6px;padding:5px 6px;border-radius:var(--radius-sm);cursor:pointer}.tree-row:hover{background:var(--bg-elev-2)}.tree-row .twisty{width:14px;color:var(--text-dim);font-size:11px}.tree-row .label{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.tree-row .icon{opacity:.85}.tree-row.project.active{background:var(--accent);color:#fff}.tree-children{margin-left:14px;border-left:1px solid var(--border);padding-left:6px}.row-actions{display:none;gap:2px}.tree-row:hover .row-actions{display:flex}.row-actions button{padding:2px 6px;font-size:12px;background:transparent;color:var(--text-dim)}.row-actions button:hover{color:var(--text);background:var(--border)}.panel{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:24px}.panel h2{margin:0 0 4px;font-size:20px}.muted{color:var(--text-dim)}.breadcrumb{color:var(--text-dim);font-size:13px;margin-bottom:16px}.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.dropzone{display:block;border:2px dashed var(--border);border-radius:var(--radius);padding:32px;text-align:center;color:var(--text-dim);transition:border-color .15s ease,background .15s ease;cursor:pointer}.dropzone.drag{border-color:var(--accent);background:#6366f114}.dz-inner{pointer-events:none}.thumbs{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.thumb{position:relative;width:90px;height:90px;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--border)}.thumb img{width:100%;height:100%;object-fit:cover}.thumb button{position:absolute;top:2px;right:2px;padding:0 6px;background:#0009;color:#fff;border-radius:50%}.study-card{max-width:680px;margin:0 auto}.flashcard{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:32px;min-height:220px;display:flex;flex-direction:column;justify-content:center}.flashcard .question{font-size:20px;font-weight:600}.flashcard .divider{height:1px;background:var(--border);margin:20px 0}.answer{color:var(--text)}.answer pre{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;overflow-x:auto}.answer code{font-family:JetBrains Mono,ui-monospace,SF Mono,monospace;font-size:13px}.answer :not(pre)>code{background:var(--bg-elev-2);padding:1px 5px;border-radius:4px}.grade-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}.grade-buttons-4{grid-template-columns:repeat(4,1fr)}.grade-buttons button{padding:14px;font-weight:600}.grade-again{background:var(--red);color:#fff}.grade-hard{background:var(--amber);color:#111}.grade-good{background:var(--green);color:#06210f}.grade-easy{background:#38bdf8;color:#062536}.progress{text-align:center;color:var(--text-dim);margin-bottom:16px}.empty{text-align:center;color:var(--text-dim);padding:60px 20px}.error{color:var(--red);margin-top:10px}textarea{font:inherit;width:100%;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;resize:vertical}textarea:focus{outline:none;border-color:var(--accent)}.text-gen{margin-top:20px;display:flex;flex-direction:column;gap:10px}.text-gen button{align-self:flex-start}.manager-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:16px}.card-edit{display:flex;flex-direction:column;gap:10px;padding:16px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:20px}.card-item{border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px;margin-bottom:12px;background:var(--bg);transition:opacity .15s ease}.card-item.busy{opacity:.55;pointer-events:none}.card-item input,.card-item textarea{margin-bottom:8px}.card-q{font-weight:600;margin-bottom:6px}.card-a{color:var(--text-dim);font-size:13px}.card-meta{display:flex;align-items:center;gap:10px;margin:10px 0;font-size:12px}.tag{background:var(--bg-elev-2);border-radius:4px;padding:1px 8px;color:var(--text)}.card-actions{display:flex;flex-wrap:wrap;gap:8px}.card-actions button{padding:5px 10px;font-size:13px}button.danger{color:var(--red)}button.danger:hover{background:#ef444426}.alternatives{margin-top:14px;padding-top:14px;border-top:1px dashed var(--border)}.alt-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.alt-item{background:var(--bg-elev-2);border-radius:var(--radius-sm);padding:12px;margin-bottom:10px}.alt-item button{margin-top:8px;padding:5px 10px;font-size:13px}.resource-list{margin-top:18px;display:flex;flex-direction:column;gap:10px}.resource-item{border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;background:var(--bg)}.resource-item input[type=text],.resource-item textarea{margin-bottom:8px}.resource-head{display:flex;align-items:center;gap:10px}.resource-head input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer}.resource-thumb{width:36px;height:36px;object-fit:cover;border-radius:4px;border:1px solid var(--border)}.resource-type{font-size:12px;background:var(--bg-elev-2);border-radius:4px;padding:2px 8px;white-space:nowrap}.resource-name{flex:1;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.resource-actions{display:flex;gap:6px}.resource-actions button{padding:4px 9px;font-size:12px}.resource-name{cursor:pointer}.resource-name:hover{color:var(--accent)}.resource-preview{margin-top:8px;font-size:12px;color:var(--text-dim);white-space:pre-wrap;max-height:42px;overflow:hidden;cursor:pointer}.resource-preview:hover{color:var(--text)}.resource-item textarea{min-height:240px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;padding:32px;z-index:50}.modal{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:760px;max-height:85vh;display:flex;flex-direction:column;overflow:hidden}.modal-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--border)}.modal-image{max-width:100%;max-height:320px;object-fit:contain;margin:16px 20px 0;border-radius:var(--radius-sm);border:1px solid var(--border);align-self:center}.modal-body{padding:20px;overflow-y:auto}.project-header{margin-bottom:16px}.project-header h2{margin:0 0 2px;font-size:22px}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);margin-bottom:24px}.tab{background:transparent;border:none;border-bottom:2px solid transparent;border-radius:0;padding:10px 16px;color:var(--text-dim);font-weight:500}.tab:hover{background:var(--bg-elev-2);color:var(--text)}.tab.active{color:var(--text);border-bottom-color:var(--accent)}.tab-badge{display:inline-block;margin-left:8px;background:var(--bg-elev-2);color:var(--text-dim);border-radius:10px;padding:1px 8px;font-size:12px}.study-cta{display:flex;align-items:center;gap:14px;margin-bottom:24px;flex-wrap:wrap}button.big{padding:12px 22px;font-size:15px}.select-head{display:flex;justify-content:space-between;align-items:center;margin:18px 0 10px;flex-wrap:wrap;gap:8px}.select-actions{display:flex;gap:6px}.select-actions button{padding:4px 10px;font-size:12px}.select-list{display:flex;flex-direction:column;gap:6px}.select-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);cursor:pointer}.select-item:hover{border-color:var(--accent)}.select-item input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer}.focus-row{margin-top:18px}.manual-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.check-inline{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--text-dim);cursor:pointer}.check-inline input[type=checkbox]{width:15px;height:15px;accent-color:var(--accent);cursor:pointer}@media(max-width:768px){.app{grid-template-columns:1fr;grid-template-rows:auto 1fr}.topbar{display:flex;align-items:center;gap:10px;padding:10px 14px;padding-top:calc(10px + env(safe-area-inset-top));padding-left:calc(14px + env(safe-area-inset-left));padding-right:calc(14px + env(safe-area-inset-right));background:var(--bg-elev);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.topbar-title{font-weight:600;letter-spacing:-.02em}.sidebar{position:fixed;top:0;left:0;bottom:0;width:84%;max-width:320px;z-index:40;transform:translate(-100%);transition:transform .22s ease;box-shadow:2px 0 16px #0006}.app.drawer-open .sidebar{transform:translate(0)}.app.drawer-open .backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:30}.close-drawer{display:block}.main{padding:16px}.row-actions{display:flex}.row-actions button{padding:6px 8px;font-size:14px}.tree-row{padding:9px 6px}.tabs{overflow-x:auto;-webkit-overflow-scrolling:touch}.tab{white-space:nowrap;flex-shrink:0}.panel{padding:16px}.study-cta .primary.big{width:100%}.grade-buttons{gap:8px}.modal-overlay{padding:0}.modal{max-width:100%;max-height:100%;height:100%;border-radius:0}.card-actions button,.resource-actions button{padding:8px 10px}}.home{max-width:640px;margin:0 auto}.home-title{font-size:24px;letter-spacing:-.02em;margin:0 0 20px}.today-section{margin-bottom:24px}.today-empty{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.deck-row{display:flex;align-items:center;gap:12px;background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;margin-bottom:8px;cursor:pointer;transition:border-color .15s ease}.deck-row:hover{border-color:var(--accent)}.deck-info{flex:1;min-width:0}.deck-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.deck-path{font-size:12px}.deck-due{background:var(--accent);color:#fff;font-weight:700;border-radius:999px;min-width:28px;height:28px;display:flex;align-items:center;justify-content:center;padding:0 8px;font-size:13px}.today-total{font-size:12px;margin:10px 2px 0}.reset-row{margin:4px 0 24px}.home-favs{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:16px 20px;margin-bottom:20px}.home-hint{font-size:13px}.brand{cursor:pointer}.home-btn{width:100%;margin-bottom:12px;text-align:left}.cram-badge{font-size:12px;color:var(--amber)}.exam-bar{display:flex;gap:12px;background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-bottom:24px}.exam-icon{font-size:20px}.exam-main{flex:1}.exam-label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:8px}.exam-controls{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.exam-controls input[type=date]{font:inherit;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:7px 10px;color-scheme:dark}.exam-hint{margin:10px 0 0;font-size:12px;color:var(--accent)}.exam-hint.muted{color:var(--text-dim)}.boot{height:100vh;display:flex;flex-direction:column;gap:8px;align-items:center;justify-content:center}.boot-brand{font-size:24px;font-weight:700;letter-spacing:-.02em}.boot-error{background:#ef44441f;color:var(--red);text-align:center;padding:12px 16px;font-size:14px}.login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.login-card{width:100%;max-width:380px;background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:32px;text-align:center}.login-brand{font-size:28px;letter-spacing:-.02em;margin:0 0 8px}.login-card form{display:flex;flex-direction:column;gap:12px;margin-top:20px}.login-card input[type=email]{font:inherit;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px;width:100%;text-align:center}.login-card input[type=email]:focus{outline:none;border-color:var(--accent)}.login-card .big{width:100%}.login-sent{margin-top:16px}.login-check{font-size:40px;margin-bottom:8px}.sidebar-footer{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:24px;padding-top:14px;border-top:1px solid var(--border)}.sidebar-email{font-size:12px;color:var(--text-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.logout-btn{font-size:13px;padding:6px 12px;flex-shrink:0}.code-input{text-align:center;letter-spacing:8px;font-size:22px;font-weight:600}.link-btn{background:transparent;color:var(--text-dim);font-size:13px;margin-top:12px;padding:6px}.link-btn:hover{color:var(--text);background:transparent;text-decoration:underline}.busy-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;display:flex;align-items:center;justify-content:center;background:#0a0c12b8;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.busy-box{display:flex;flex-direction:column;align-items:center;gap:16px;background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:28px 36px;max-width:80%;text-align:center}.busy-spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:busy-spin .8s linear infinite}@keyframes busy-spin{to{transform:rotate(360deg)}}.busy-msg{color:var(--text);font-weight:500}.busy-fade-enter-active,.busy-fade-leave-active{transition:opacity .15s ease}.busy-fade-enter-from,.busy-fade-leave-to{opacity:0}