:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f4f5fb;--surface:#fff;--surface-2:#f7f8fd;--ink:#1b1c2b;--ink-soft:#4a4c63;--ink-faint:#71748c;--line:#e3e5f0;--line-strong:#cdd0e2;--indigo:#4f46e5;--indigo-soft:#ecebfd;--teal:#0d9488;--teal-soft:#dcf5f1;--code-bg:#1e1f36;--code-ink:#e9eaf6;--code-cmt:#8f93c7;--danger:#be123c;--danger-bg:#fff1f2;--shadow:0 1px 2px #1b1c2b0d, 0 10px 30px #4f46e512}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#0e0f1c;--surface:#191a2b;--surface-2:#151624;--ink:#ecedf7;--ink-soft:#b7b9d4;--ink-faint:#8a8dad;--line:#2a2c44;--line-strong:#3a3c5c;--indigo:#9d97ff;--indigo-soft:#241f52;--teal:#4fd6c4;--teal-soft:#113a37;--code-bg:#0a0b16;--code-ink:#e9eaf6;--code-cmt:#7a7eb0;--danger:#fda4af;--danger-bg:#3b1220;--shadow:0 1px 2px #0006, 0 14px 36px #0006}}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#0e0f1c;--surface:#191a2b;--surface-2:#151624;--ink:#ecedf7;--ink-soft:#b7b9d4;--ink-faint:#8a8dad;--line:#2a2c44;--line-strong:#3a3c5c;--indigo:#9d97ff;--indigo-soft:#241f52;--teal:#4fd6c4;--teal-soft:#113a37;--code-bg:#0a0b16;--code-ink:#e9eaf6;--code-cmt:#7a7eb0;--danger:#fda4af;--danger-bg:#3b1220;--shadow:0 1px 2px #0006, 0 14px 36px #0006}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);min-height:100vh;margin:0;font-family:Hind Siliguri,system-ui,Segoe UI,sans-serif;font-size:15.5px;line-height:1.65}.app-shell{background:radial-gradient(ellipse 80% 50% at 10% -10%, color-mix(in srgb, var(--indigo) 14%, transparent), transparent 55%), radial-gradient(ellipse 60% 40% at 100% 0%, color-mix(in srgb, var(--teal) 12%, transparent), transparent 50%), var(--bg);min-height:100vh}.student-shell{background:radial-gradient(ellipse 70% 45% at 90% 5%, color-mix(in srgb, var(--teal) 16%, transparent), transparent 55%), radial-gradient(ellipse 55% 35% at 0% 20%, color-mix(in srgb, var(--indigo) 12%, transparent), transparent 50%), var(--bg)}a{color:var(--indigo)}button,input,textarea,select{font:inherit;color:inherit}img{max-width:100%}.wrap{max-width:860px;margin-inline:auto;padding:0 16px 72px}.wrap.wide{max-width:1040px}.topbar{z-index:50;background:color-mix(in srgb, var(--surface) 88%, transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);position:sticky;top:0}.topbar-in{flex-wrap:wrap;align-items:center;gap:10px;max-width:1040px;margin-inline:auto;padding:12px 16px;display:flex}.brand{color:var(--ink);letter-spacing:.2px;align-items:center;gap:9px;font-family:"Baloo Da 2",sans-serif;font-weight:700;text-decoration:none;display:flex}.brand .logo{background:linear-gradient(135deg, var(--indigo), var(--teal));color:#fff;border-radius:9px;place-items:center;width:30px;height:30px;font-size:15px;font-weight:800;display:grid}.brand small{color:var(--ink-faint);letter-spacing:1.4px;font-family:Hind Siliguri,sans-serif;font-size:10.5px;font-weight:600;display:block}.spacer{flex:1}.who{color:var(--ink-soft);text-overflow:ellipsis;white-space:nowrap;max-width:140px;font-size:13px;font-weight:600;overflow:hidden}.user-pill{border:1px solid var(--line);background:var(--surface);border-radius:999px;align-items:center;gap:8px;padding:4px 10px 4px 4px;display:inline-flex}.avatar{color:#fff;background:linear-gradient(135deg, var(--indigo), var(--teal));border-radius:999px;place-items:center;width:28px;height:28px;font-family:"Baloo Da 2",sans-serif;font-size:13px;font-weight:800;display:grid}.btn-icon{border:1px solid var(--line-strong);background:var(--surface);width:38px;height:38px;color:var(--ink-soft);cursor:pointer;border-radius:11px;place-items:center;padding:0;transition:border-color .15s,color .15s,transform .15s,background .15s;display:inline-grid}.btn-icon:hover{border-color:var(--indigo);color:var(--indigo);transform:translateY(-1px)}.theme-toggle svg{display:block}.btn{cursor:pointer;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink-soft);border-radius:9px;align-items:center;gap:6px;padding:7px 13px;font-family:inherit;font-size:13px;font-weight:600;text-decoration:none;display:inline-flex}.btn:hover{border-color:var(--indigo);color:var(--indigo)}.btn.primary{background:var(--indigo);border-color:var(--indigo);color:#fff}.btn.primary:hover{filter:brightness(1.07);color:#fff}.btn.ghost{background:0 0;border-color:#0000}.btn.ghost:hover{background:var(--surface-2);border-color:var(--line)}.btn.block{justify-content:center;width:100%;padding:11px 16px;font-size:14px}.btn.lg{border-radius:12px;padding:12px 22px;font-size:15px}.btn:disabled{opacity:.55;cursor:not-allowed}.btn.small{padding:5px 9px;font-size:12px}.btn:focus-visible,.btn-icon:focus-visible{outline:2px solid var(--indigo);outline-offset:2px}.timer{background:var(--indigo-soft);color:var(--indigo);text-align:center;border-radius:999px;min-width:84px;padding:6px 12px;font-family:JetBrains Mono,monospace;font-weight:700}.timer.urgent{background:var(--danger-bg);color:var(--danger)}.timer.done{background:var(--teal-soft);color:var(--teal)}.paper-head,.q,.panel,.note,.key{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}.paper-head{border-radius:18px;margin-top:28px;padding:26px 24px;position:relative;overflow:hidden}.paper-head:before{content:"";background:linear-gradient(90deg, var(--indigo), var(--teal));height:5px;position:absolute;inset:0 0 auto}.eyebrow{letter-spacing:2px;color:var(--teal);text-transform:uppercase;margin:4px 0 6px;font-size:11.5px;font-weight:700}h1,h2,h3{font-family:"Baloo Da 2",sans-serif}h1{margin:0 0 8px;font-size:clamp(1.7rem,5.2vw,2.5rem);font-weight:800;line-height:1.15}h2{margin:0;font-size:19px}.subtitle{color:var(--ink-soft);max-width:68ch;margin:0}.meta{flex-wrap:wrap;gap:10px;margin-top:18px;display:flex}.chip{background:var(--surface-2);border:1px solid var(--line);color:var(--ink-soft);border-radius:10px;padding:8px 12px;font-size:12.5px}.chip b{color:var(--ink)}.note{box-shadow:none;background:var(--surface-2);border-style:dashed;border-radius:14px;margin-top:18px;padding:16px 18px}.note h3,.panel h3{letter-spacing:1px;text-transform:uppercase;color:var(--indigo);margin:0 0 8px;font-size:13px}.note ul,.q-body ul,.q-body ol{margin:8px 0;padding-left:22px}.note li,.q-body li{margin:3px 0}.part{border-bottom:2px solid var(--line);align-items:baseline;gap:12px;margin:38px 2px 14px;padding-bottom:10px;display:flex}.part .pnum{color:var(--indigo);font-family:"Baloo Da 2",sans-serif;font-size:26px;font-weight:800}.part .pmeta{color:var(--ink-faint);margin-left:auto;font-size:12px}.q{border-radius:15px;margin-bottom:14px;padding:18px 18px 16px}.q.build{border-color:var(--indigo)}.q-top{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px;display:flex}.qnum{background:var(--indigo-soft);width:30px;height:30px;color:var(--indigo);border-radius:9px;place-items:center;font-family:"Baloo Da 2",sans-serif;font-weight:800;display:grid}.tag{letter-spacing:.8px;text-transform:uppercase;background:var(--teal-soft);color:var(--teal);border-radius:999px;padding:3px 8px;font-size:10.5px;font-weight:700}.tag.build{background:var(--indigo-soft);color:var(--indigo)}.marks{color:var(--ink-faint);margin-left:auto;font-size:12px;font-weight:700}.q-body p{margin:0 0 8px}.hint{color:var(--ink-faint);margin-top:9px;font-size:13px}.hint b{color:var(--teal)}pre,textarea.code{background:var(--code-bg);color:var(--code-ink);white-space:pre-wrap;border:1px solid #ffffff0f;border-radius:11px;margin:11px 0;padding:13px 15px;font-family:JetBrains Mono,monospace;font-size:13px;line-height:1.6;overflow-x:auto}pre .c{color:var(--code-cmt);font-style:italic}code.inl{background:var(--indigo-soft);color:var(--indigo);border-radius:6px;padding:1px 6px;font-family:JetBrains Mono,monospace;font-size:.88em}.opt{gap:7px;margin-top:10px;display:grid}.opt-item{border:1px solid var(--line);background:var(--surface-2);cursor:pointer;border-radius:10px;align-items:flex-start;gap:9px;padding:8px 11px;display:flex}.opt-item input{accent-color:var(--indigo);margin-top:4px}.opt-item .k{color:var(--indigo);font-family:JetBrains Mono,monospace;font-size:13px;font-weight:700}.opt-item.picked{border-color:var(--indigo);background:var(--indigo-soft)}.answerspace{border-top:1px dashed var(--line);gap:10px;margin-top:12px;padding-top:11px;display:grid}.lbl{letter-spacing:1px;text-transform:uppercase;color:var(--ink-faint);font-size:11px;font-weight:700}textarea,input[type=text],input[type=email],input[type=password],input[type=number],select,.input{background:var(--surface);border:1px solid var(--line-strong);border-radius:12px;width:100%;padding:11px 14px;transition:border-color .15s,box-shadow .15s}textarea:focus,input:focus,select:focus,.input:focus{border-color:var(--indigo);box-shadow:0 0 0 3px color-mix(in srgb, var(--indigo) 22%, transparent);outline:none}textarea{resize:vertical;min-height:96px}textarea.code{width:100%;min-height:160px;margin:0}textarea.code.tall{min-height:280px}.lbl-row{flex-wrap:wrap;align-items:baseline;gap:8px 12px;margin-bottom:8px;display:flex}.lbl-optional{letter-spacing:0;text-transform:none;color:var(--ink-faint);font-size:12px;font-weight:500}.attach-block{margin-top:4px}.upload-row{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;display:grid}.upload-zone{border:1.5px dashed var(--line-strong);background:var(--surface-2);border-radius:14px;align-items:center;gap:12px;padding:12px 14px;transition:border-color .15s,background .15s,box-shadow .15s;display:flex;position:relative}.upload-zone.is-drag{border-color:var(--indigo);background:var(--indigo-soft);box-shadow:0 0 0 3px color-mix(in srgb, var(--indigo) 18%, transparent)}.upload-zone.is-busy{opacity:.75;pointer-events:none}.upload-zone-input{opacity:0;pointer-events:none;width:0;height:0;position:absolute}.upload-zone-icon{background:var(--surface);border:1px solid var(--line);width:42px;height:42px;color:var(--indigo);border-radius:11px;flex:none;place-items:center;display:grid}.upload-zone-copy{flex:1;gap:2px;min-width:0;font-size:13px;display:grid}.upload-zone-copy strong{color:var(--ink);font-weight:700}.upload-zone-copy span{color:var(--ink-faint);font-size:12px}.upload-zone-btn{flex:none;background:var(--surface)!important}.upload-zone-btn:hover{background:var(--indigo-soft)!important}.attach-preview{gap:10px;margin-top:12px;display:grid}.thumbs{flex-wrap:wrap;gap:10px;display:flex}.thumbs figure{border:1px solid var(--line);background:var(--surface-2);border-radius:10px;width:140px;margin:0;overflow:hidden}.thumbs img{object-fit:cover;width:100%;height:96px;display:block}.thumbs figcaption,.file-row{justify-content:space-between;align-items:center;gap:8px;padding:8px 10px;font-size:12px;display:flex}.thumbs .file-name{text-overflow:ellipsis;white-space:nowrap;max-width:100px;overflow:hidden}.file-list{gap:6px;display:grid}.file-row{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:10px 12px}.file-link{color:var(--indigo);text-overflow:ellipsis;align-items:center;gap:8px;font-size:13px;font-weight:600;text-decoration:none;display:inline-flex;overflow:hidden}.file-link:hover{text-decoration:underline}.btn.ghost-danger{color:var(--danger);background:0 0;border-color:#0000;padding:4px 8px}.btn.ghost-danger:hover{background:var(--danger-bg);color:var(--danger);border-color:#0000}.key{border:1.5px solid var(--teal);box-shadow:none;border-radius:12px;margin-top:10px;padding:12px 14px}.key h4{color:var(--teal);margin:0 0 6px;font-size:14px}.key p{color:var(--ink-soft);margin:4px 0;font-size:14px}.jumps{border:1px solid var(--line);background:color-mix(in srgb, var(--surface) 90%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:40;border-radius:14px;flex-wrap:wrap;gap:6px;margin:16px 0;padding:10px 12px;display:flex;position:sticky;top:62px}.jumps a{border:1px solid var(--line);width:34px;height:34px;color:var(--ink-soft);background:var(--surface);border-radius:8px;place-items:center;font-weight:700;text-decoration:none;display:grid}.jumps a.done{background:var(--teal-soft);color:var(--teal);border-color:#0000}.auth-wrap{max-width:520px;margin:0 auto;padding:8px 16px 64px}.auth-page{background:radial-gradient(ellipse 90% 60% at 0% 0%, color-mix(in srgb, var(--indigo) 18%, transparent), transparent 55%), radial-gradient(ellipse 70% 50% at 100% 100%, color-mix(in srgb, var(--teal) 14%, transparent), transparent 50%), var(--bg);min-height:100vh;padding:0 16px 48px;position:relative;overflow:hidden}.auth-glow{filter:blur(80px);pointer-events:none;opacity:.45;border-radius:50%;position:fixed}.auth-glow-a{background:var(--indigo);width:320px;height:320px;top:-80px;right:10%}.auth-glow-b{background:var(--teal);width:280px;height:280px;bottom:10%;left:-60px}.auth-top{justify-content:space-between;align-items:center;gap:12px;max-width:1100px;margin:0 auto;padding:16px 0;display:flex}.auth-split{grid-template-columns:1fr 1fr;align-items:center;gap:32px;max-width:1100px;margin:0 auto;padding-top:8px;display:grid}.auth-hero{padding:12px 8px 24px}.auth-hero-title{margin:0 0 12px;font-family:"Baloo Da 2",sans-serif;font-size:clamp(2rem,5vw,2.85rem);font-weight:800;line-height:1.12}.auth-hero-text{color:var(--ink-soft);max-width:42ch;margin:0 0 24px;font-size:16px}.auth-features{gap:12px;margin:0 0 24px;padding:0;list-style:none;display:grid}.auth-features li{border:1px solid var(--line);background:color-mix(in srgb, var(--surface) 85%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);color:var(--ink-soft);border-radius:14px;align-items:flex-start;gap:12px;padding:12px 14px;font-size:14px;display:flex}.feat-icon{background:var(--indigo-soft);border-radius:10px;flex:none;place-items:center;width:36px;height:36px;display:grid}.auth-badges{flex-wrap:wrap;gap:8px;display:flex}.auth-badge{letter-spacing:.6px;text-transform:uppercase;background:var(--teal-soft);color:var(--teal);border-radius:999px;padding:6px 12px;font-size:11px;font-weight:700}.auth-card{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:22px;padding:28px 26px 30px;position:relative;overflow:hidden}.auth-card:before{content:"";background:linear-gradient(90deg, var(--indigo), var(--teal));height:4px;position:absolute;inset:0 0 auto}.auth-card-wide{max-width:none}.auth-form{margin:0}.auth-card-title{margin:0 0 6px;font-family:"Baloo Da 2",sans-serif;font-size:1.65rem;font-weight:800;line-height:1.2}.otp-input{letter-spacing:.35em;text-align:center;font-family:JetBrains Mono,monospace;font-size:1.35rem}.form-grid{gap:12px;margin-top:16px;display:grid}label.field{color:var(--ink-soft);gap:6px;font-size:13px;font-weight:700;display:grid}.row-links{justify-content:space-between;gap:12px;margin-top:14px;font-size:14px;display:flex}.row-links.center{justify-content:center}.alert{background:var(--danger-bg);color:var(--danger);border-radius:10px;padding:10px 12px;font-size:14px}.alert.ok{background:var(--teal-soft);color:var(--teal)}.dash-hero{border:1px solid var(--line);background:linear-gradient(135deg, color-mix(in srgb, var(--surface) 92%, var(--indigo)), var(--surface));box-shadow:var(--shadow);border-radius:22px;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px;margin-top:24px;padding:28px 26px;display:flex;position:relative;overflow:hidden}.dash-hero:after{content:"";background:color-mix(in srgb, var(--teal) 12%, transparent);pointer-events:none;border-radius:50%;width:200px;height:200px;position:absolute;top:-60px;right:-40px}.dash-hero-copy{z-index:1;flex:280px;position:relative}.dash-hero h1{margin-bottom:6px}.stat-grid{z-index:1;flex-wrap:wrap;gap:10px;display:flex;position:relative}.stat-tile{border:1px solid var(--line);background:var(--surface);border-radius:16px;min-width:100px;padding:14px 18px;box-shadow:0 4px 14px #4f46e50f}.stat-tile.accent{border-color:color-mix(in srgb, var(--indigo) 35%, var(--line));background:var(--indigo-soft)}.stat-tile.teal{border-color:color-mix(in srgb, var(--teal) 35%, var(--line));background:var(--teal-soft)}.stat-num{color:var(--ink);font-family:"Baloo Da 2",sans-serif;font-size:1.75rem;font-weight:800;line-height:1.1;display:block}.stat-label{color:var(--ink-faint);font-size:12px;font-weight:600}.section-head{margin:28px 2px 12px}.section-head h2{margin-bottom:4px;font-size:1.35rem}.quiz-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:8px;display:grid}.quiz-card-v2{color:inherit;border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow);border-radius:18px;flex-direction:column;gap:8px;min-height:100%;padding:20px 18px 18px;text-decoration:none;transition:transform .18s,border-color .18s,box-shadow .18s;display:flex}.quiz-card-v2:hover{border-color:color-mix(in srgb, var(--indigo) 45%, var(--line));box-shadow:0 14px 40px color-mix(in srgb, var(--indigo) 12%, transparent);transform:translateY(-3px)}.quiz-card-v2 h3{margin:0;font-family:"Baloo Da 2",sans-serif;font-size:1.25rem;line-height:1.25}.quiz-card-top{justify-content:space-between;align-items:center;gap:8px;display:flex}.quiz-card-arrow{background:var(--surface-2);width:32px;height:32px;color:var(--indigo);border-radius:10px;place-items:center;font-weight:700;transition:background .15s;display:grid}.quiz-card-v2:hover .quiz-card-arrow{background:var(--indigo-soft)}.status-pill{letter-spacing:.5px;text-transform:uppercase;background:var(--surface-2);color:var(--ink-faint);border-radius:999px;padding:4px 10px;font-size:10px;font-weight:800}.status-pill.live{background:var(--indigo-soft);color:var(--indigo)}.status-pill.done{background:var(--teal-soft);color:var(--teal)}.status-pill.warn{background:var(--danger-bg);color:var(--danger)}.status-pill.idle{background:var(--surface-2);color:var(--ink-faint)}.quiz-metrics{color:var(--ink-faint);flex-wrap:wrap;gap:12px;margin-top:4px;font-size:13px;display:flex}.quiz-metrics strong{color:var(--ink);font-weight:700}.quiz-cta{color:var(--indigo);margin-top:auto;padding-top:10px;font-size:13px;font-weight:700}.start-panel{border:1px solid color-mix(in srgb, var(--indigo) 30%, var(--line));background:linear-gradient(135deg, var(--indigo-soft), var(--surface));border-radius:18px;margin-top:20px;padding:22px 20px}.start-panel-inner{flex-wrap:wrap;align-items:center;gap:16px 20px;display:flex}.start-panel h3{margin:0 0 4px;font-size:1.1rem}.start-icon{background:var(--surface);border:1px solid var(--line);border-radius:14px;flex:none;place-items:center;width:52px;height:52px;font-size:1.5rem;display:grid}.start-panel-inner .btn.lg{margin-left:auto}.empty-state{text-align:center;border:1px dashed var(--line-strong);background:var(--surface-2);border-radius:18px;margin-top:12px;padding:48px 24px}.empty-icon{margin-bottom:8px;font-size:2rem;display:block}.cards{gap:14px;margin-top:18px;display:grid}.quiz-card{color:inherit;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:18px;text-decoration:none;display:block}.quiz-card:hover{border-color:var(--indigo)}.quiz-card h2{margin-bottom:6px;font-size:22px}.muted{color:var(--ink-faint);font-size:13px}.panel{border-radius:16px;margin-top:18px;padding:18px}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%}th,td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:10px 8px;font-size:14px}th{color:var(--ink-faint);letter-spacing:.4px;font-size:12px}.checks{flex-wrap:wrap;gap:12px;font-size:14px;font-weight:600;display:flex}.center-msg{text-align:center;color:var(--ink-soft);padding:48px 16px}footer{text-align:center;color:var(--ink-faint);margin-top:28px;font-size:12.5px}.save-note{color:var(--ink-faint);font-size:12px}@media (width<=900px){.auth-split{grid-template-columns:1fr;gap:20px}.auth-hero{padding-bottom:0}.auth-hero-title{font-size:1.85rem}}@media (width<=540px){.paper-head,.q,.panel{padding:16px 14px}.user-pill .who{display:none}.dash-hero{padding:20px 16px}.stat-grid{width:100%}.stat-tile{flex:1;min-width:0}.start-panel-inner .btn.lg{width:100%;margin-left:0}}