:root{--bg: #070b16;--card: #111b30;--field: #0b1424;--ink: #e9eefb;--muted: #8ea0c6;--line: #24314f;--brand: #5b8cff;--brand-2: #8f7bff;--brand-soft: rgba(91, 140, 255, .15);--ok: #34d399;--ok-soft: rgba(52, 211, 153, .14);--warn: #f6a55c;--warn-soft: rgba(246, 165, 92, .14);--danger: #ff6b6b;--radius: 14px;color-scheme:dark}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Noto Sans Sinhala,system-ui,sans-serif;background:radial-gradient(900px 520px at 85% -8%,rgba(143,123,255,.14),transparent 55%),radial-gradient(1000px 620px at 8% -12%,rgba(91,140,255,.18),transparent 55%),var(--bg);background-attachment:fixed;color:var(--ink);-webkit-font-smoothing:antialiased}::selection{background:#5b8cff59}::placeholder{color:#6b7aa0}::-webkit-scrollbar{width:11px;height:11px}::-webkit-scrollbar-thumb{background:#2a3a5e;border-radius:8px;border:2px solid 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18px;font-size:15px;cursor:pointer;transition:.14s}.choice:hover{border-color:var(--brand);color:var(--brand)}.choice.sel{background:linear-gradient(135deg,var(--brand),#3d63f0);color:#fff;border-color:transparent;box-shadow:0 6px 18px #3d63f066}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}input:not([type=checkbox]):not([type=radio]):not([type=file]),select,textarea{border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:15px;font-family:inherit;background:var(--field);color:var(--ink);flex:1;min-width:200px}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}input[type=file]{color:var(--muted);font-size:14px}.btn{background:linear-gradient(135deg,var(--brand) 0%,#3d63f0 100%);color:#fff;border:0;border-radius:12px;padding:12px 22px;font-size:15px;font-weight:600;cursor:pointer;box-shadow:0 8px 20px #3d63f059;transition:transform .12s,box-shadow .12s,filter 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14px;margin-bottom:8px;cursor:pointer;font-size:15px;transition:.12s}.opt:hover{border-color:var(--brand)}.opt.correct{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}.opt.wrong{background:var(--warn-soft);border-color:var(--warn);color:var(--warn)}.figure{border:1px solid var(--line);border-radius:10px;padding:12px;margin:10px 0;background:#f5f7fb;text-align:center}.figure svg{max-width:100%;height:auto}.code{background:#0a0f1c;color:#cdd8ee;border:1px solid var(--line);border-radius:8px;padding:12px 14px;margin:8px 0;font-family:Cascadia Code,Consolas,Courier New,monospace;font-size:14px;line-height:1.5;white-space:pre;overflow-x:auto}.qen{color:var(--muted);font-style:italic;font-size:15px;margin:4px 0 10px;padding-left:10px;border-left:3px solid var(--brand)}.oen{display:block;color:var(--muted);font-size:14px;margin-top:3px}.unit-select{border:1px solid var(--line);border-radius:12px;padding:11px 14px;font-size:15px;font-family:inherit;background:var(--field);color:var(--ink);flex:1;min-width:240px;cursor:pointer}.qtable{border-collapse:collapse;margin:10px 0;font-size:15px;min-width:60%}.qtable th,.qtable td{border:1px solid var(--line);padding:8px 14px;text-align:left}.qtable th{background:var(--brand-soft);color:var(--brand);font-weight:600}.kb-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}@media (max-width: 720px){.kb-grid{grid-template-columns:1fr}}.login-wrap{max-width:620px;margin:40px auto;padding:0 18px}.auth-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:30px 28px;max-width:540px;margin:0 auto;box-shadow:0 26px 64px #00000073}.auth-title{font-size:28px;font-weight:800;margin:0 0 4px;letter-spacing:-.01em}.auth-sub{color:var(--muted);font-size:15px;margin:0 0 22px}.auth .field{margin:14px 0}.auth .grid2{margin:14px 0;gap:14px}.auth .grid2 .field{margin:0}.auth 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button.active{background:var(--brand-soft);color:var(--brand);font-weight:600}.opt.chosen{border-color:var(--brand);background:var(--brand-soft)}.publishbar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;position:sticky;top:62px;z-index:3}.publishbar .btn{margin-left:auto}.chk{display:inline-flex;align-items:center;gap:8px;font-size:15px;cursor:pointer}.chk input{width:18px;height:18px;cursor:pointer;accent-color:var(--brand)}.qwrap{position:relative}.qpick{margin:4px 0 -6px;padding:6px 10px;border-radius:8px;background:#ffffff08;border:1px solid var(--line);color:var(--muted)}.qwrap.picked .qpick{border-color:var(--brand);color:var(--brand)}.kb-col h2{display:flex;align-items:center;gap:8px}.kb-flag{font-size:13px;color:var(--muted);font-weight:400}.reveal{margin-top:10px;font-size:15px}.reveal b{color:var(--ink)}.answer-box{background:var(--ok-soft);border:1px solid rgba(52,211,153,.25);border-radius:10px;padding:12px 14px;margin-top:8px;font-size:15px;white-space:pre-wrap}.pill{display:inline-block;background:var(--brand-soft);color:var(--brand);border-radius:999px;padding:3px 12px;font-size:13px;margin:0 6px 6px 0}.muted{color:var(--muted);font-size:14px}.err{background:var(--warn-soft);color:var(--warn);border:1px solid rgba(246,165,92,.3);border-radius:10px;padding:12px 14px;font-size:15px}.ok{background:var(--ok-soft);color:var(--ok);border:1px solid rgba(52,211,153,.3);border-radius:10px;padding:12px 14px;font-size:15px}.spin{color:var(--muted);font-size:15px}.drop{border:2px dashed var(--line);border-radius:14px;padding:34px;text-align:center;color:var(--muted);cursor:pointer}.drop:hover{border-color:var(--brand);color:var(--brand)}table{width:100%;border-collapse:collapse;margin-top:10px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);font-size:14px}th{color:var(--muted);font-weight:600}tbody tr:hover{background:#ffffff05}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#03060eb3;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;z-index:20;padding:16px}.modal{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;width:100%;max-width:460px;max-height:90vh;overflow-y:auto;box-shadow:0 30px 80px #0009}.field{display:block;margin:12px 0}.field>span{display:block;font-size:14px;color:var(--muted);margin-bottom:5px}.field input{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;font-size:15px;font-family:inherit;background:var(--field);color:var(--ink)}.icon-preview{width:80px;height:46px;border-radius:10px;object-fit:cover;border:1px solid var(--line);margin-top:6px}.cropper{position:relative;overflow:hidden;border-radius:12px;border:1px solid var(--line);background:#000;cursor:grab;touch-action:none;margin:0 auto;-webkit-user-select:none;user-select:none}.cropper:active{cursor:grabbing}.picker{position:relative;max-width:480px}.picker-toggle{width:100%;display:flex;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:12px;padding:11px 14px;font-size:15px;font-family:inherit;background:var(--field);color:var(--ink);cursor:pointer}.picker-toggle .caret{color:var(--muted)}.picker-menu{position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:10;background:var(--card);border:1px solid var(--line);border-radius:12px;box-shadow:0 20px 50px #00000080;overflow:hidden;max-height:320px;overflow-y:auto}.picker-item{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:0;background:transparent;padding:10px 14px;font-size:15px;font-family:inherit;color:var(--ink);cursor:pointer;border-bottom:1px solid var(--line)}.picker-item:last-child{border-bottom:0}.picker-item:hover{background:var(--brand-soft)}.picker-name{flex:1}.topic-icon{width:26px;height:26px;border-radius:7px;object-fit:cover;vertical-align:middle;border:1px solid var(--line)}.topic-icon.placeholder{background:var(--brand-soft);border:1px solid var(--line)}.tick{color:var(--ok);font-weight:700}.mini{font-size:12px;color:var(--muted);background:#ffffff0d;border-radius:999px;padding:2px 8px}.stat-row{display:flex;gap:12px;flex-wrap:wrap;margin:6px 0 12px}.stat{flex:1;min-width:90px;background:linear-gradient(160deg,#5b8cff1a,#ffffff05);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}.stat b{display:block;font-size:28px;color:var(--brand);text-shadow:0 0 20px rgba(91,140,255,.5)}.stat span{font-size:13px;color:var(--muted)}.stat.hot{background:linear-gradient(160deg,#f6a55c24,#ffffff05);border-color:#f6a55c4d}.stat.hot b{color:var(--warn);text-shadow:0 0 20px rgba(246,165,92,.4)}.paper-list{list-style:none;margin:6px 0;padding:0}.paper-list li{display:flex;align-items:center;gap:8px;padding:7px 0;border-bottom:1px solid var(--line);font-size:15px}.lang-badge{font-size:11px;color:var(--muted);background:#ffffff0d;border-radius:6px;padding:1px 6px}.badge-new{font-size:11px;color:var(--warn);background:var(--warn-soft);border-radius:6px;padding:1px 7px;font-weight:700}.time-low{color:var(--danger);font-weight:700}details summary{cursor:pointer;padding:4px 0;font-weight:500}.chips{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:#ffffff08;color:var(--ink);border-radius:999px;padding:7px 16px;font-size:14px;cursor:pointer;font-family:inherit}.chip.on{background:linear-gradient(135deg,var(--brand),#3d63f0);color:#fff;border-color:transparent;box-shadow:0 4px 14px #3d63f066}.sec-head{display:flex;align-items:center;gap:10px;margin-top:0}.sec-head.new{color:var(--warn)}.sec-head.done{color:var(--ok)}.sec-count{font-size:13px;font-weight:600;background:var(--brand-soft);color:var(--brand);border-radius:999px;padding:2px 10px}.paper-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:16px}.paper-card{display:flex;flex-direction:column;text-align:left;padding:0;cursor:pointer;background:var(--field);border:1px solid var(--line);border-radius:14px;overflow:hidden;font-family:inherit;transition:box-shadow .18s,transform .18s,border-color .18s}.paper-card:hover{box-shadow:0 16px 40px #00000073;transform:translateY(-3px);border-color:var(--brand)}.paper-card:disabled{opacity:.6;cursor:default}.paper-thumb{position:relative;height:118px;background:linear-gradient(140deg,#5b8cff47,#8f7bff29);display:flex;align-items:center;justify-content:center}.paper-thumb img{width:100%;height:100%;object-fit:cover}.paper-thumb-ph{font-size:44px;font-weight:700;color:#fff;text-transform:uppercase;opacity:.85}.paper-done{position:absolute;top:8px;right:8px;background:var(--ok);color:#06231a;width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700}.paper-newtag{position:absolute;top:8px;left:8px;background:var(--warn);color:#241203;font-size:11px;font-weight:700;border-radius:6px;padding:2px 7px}.paper-info{padding:12px 14px}.paper-title{font-weight:600;font-size:15px;margin-bottom:6px}.paper-meta{display:flex;gap:6px;flex-wrap:wrap;align-items:center}.deadline{margin-top:8px;font-size:12.5px;color:var(--muted)}.deadline.due-soon{color:var(--warn);font-weight:600}.topbar-avatar{width:38px;height:38px;border-radius:50%;object-fit:cover;border:2px solid rgba(91,140,255,.5);box-shadow:0 0 0 3px #5b8cff1f}.nic-thumb{width:56px;height:38px;object-fit:cover;border-radius:6px;border:1px solid var(--line)}.nic-preview{max-width:220px;max-height:150px;border-radius:10px;border:1px solid var(--line);margin-top:8px;display:block}