*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg-primary: #09090b;--bg-card: #18181b;--bg-card-hover: #232326;--border-subtle: #27272a;--border-active: #3b82f6;--text-primary: #fafafa;--text-secondary: #a1a1aa;--text-muted: #71717a;--accent: #3b82f6;--accent-dim: rgba(59, 130, 246, .14);--accent-glow: transparent;--correct: #22c55e;--correct-dim: rgba(34, 197, 94, .12);--incorrect: #ef4444;--incorrect-dim: rgba(239, 68, 68, .12);--radius-card: 14px;--radius-btn: 10px;--radius-sm: 8px;--shadow-card: 0 1px 2px rgba(0, 0, 0, .35);--shadow-glow: none;--transition: .18s ease;--font-ui: Inter, system-ui, sans-serif;--font-bn: "Hind Siliguri", "Noto Sans Bengali", 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solid var(--border-subtle);border-radius:var(--radius-card);padding:20px 18px 24px;width:100%;max-width:400px;max-height:80vh;overflow-y:auto;transform:translateY(20px) scale(.96);transition:var(--transition)}.palette-overlay.active .palette-popup{transform:translateY(0) scale(1)}.palette-popup .popup-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.palette-popup .popup-header h3{font-size:1rem;font-weight:800;color:#fff}.palette-popup .close-btn{width:32px;height:32px;border-radius:50%;border:none;background:var(--border-subtle);color:var(--text-secondary);font-size:1rem;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center}.palette-popup .close-btn:active{transform:scale(.9)}.palette-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(36px,1fr));gap:6px;margin-bottom:12px}.palette-dot{aspect-ratio:1/1;border-radius:var(--radius-sm);background:#1a232f;border:1px solid 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var(--border-subtle)}.modal-overlay{position:fixed;inset:0;background:#000000d9;backdrop-filter:blur(10px);z-index:700;display:flex;align-items:center;justify-content:center;padding:16px;opacity:0;visibility:hidden;transition:var(--transition)}.modal-overlay.active{opacity:1;visibility:visible}.modal{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-card);width:100%;max-width:400px;padding:22px 18px 20px;transform:translateY(24px) scale(.96);transition:var(--transition);max-height:90vh;overflow-y:auto}.modal-overlay.active .modal{transform:translateY(0) scale(1)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.modal-header h3{font-size:1.05rem;font-weight:800;color:#fff}.setting-group{margin-bottom:16px}.setting-group .label{font-size:.7rem;font-weight:700;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;display:block}.limit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.limit-btn{padding:8px;border:1.5px solid var(--border-subtle);border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);font-weight:700;font-size:.8rem;cursor:pointer;transition:var(--transition);font-family:Arial,sans-serif;touch-action:manipulation}.limit-btn:active{transform:scale(.95)}.limit-btn.active{background:var(--accent);border-color:var(--accent);color:#000}.chapter-list{max-height:100px;overflow-y:auto;border:1px solid var(--border-subtle);border-radius:var(--radius-sm);padding:6px 8px;background:#0d131c;display:flex;flex-direction:column;gap:4px}.chapter-list label{display:flex;align-items:center;gap:8px;font-size:.8rem;color:var(--text-secondary);cursor:pointer;padding:2px 0}.chapter-list 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var(--border-subtle);border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);font-weight:700;font-size:.75rem;cursor:pointer;transition:var(--transition);font-family:Arial,sans-serif}.lang-btn:active{transform:scale(.95)}.lang-btn.active{background:var(--accent);border-color:var(--accent);color:#000}.summary-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-card);padding:28px 22px 24px;width:100%;max-width:400px;text-align:center;transform:translateY(24px) scale(.96);transition:var(--transition)}.modal-overlay.active .summary-card{transform:translateY(0) scale(1)}.summary-card h2{font-size:1.2rem;font-weight:800;margin-bottom:6px;color:#fff}.big-score{font-size:3.6rem;font-weight:900;font-family:Arial,sans-serif;background:linear-gradient(135deg,var(--accent),var(--correct));-webkit-background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2;margin:4px 0 2px}.rating{font-size:.9rem;font-weight:600;margin-bottom:14px;padding:4px 0}.rating.excellent{color:var(--correct)}.rating.needs-work{color:var(--text-secondary)}.summary-stats{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin:10px 0 14px}.summary-stat{font-size:.8rem;font-weight:700;padding:4px 12px;border-radius:20px;background:#0d131c;border:1px solid var(--border-subtle)}.summary-stat.s-correct{color:var(--correct);border-color:var(--correct)}.summary-stat.s-incorrect{color:var(--incorrect);border-color:var(--incorrect)}.summary-stat.s-unattempted{color:var(--text-secondary)}.summary-timer{font-size:.75rem;color:var(--text-secondary);margin-bottom:14px}.summary-card .btn-row{justify-content:center;display:flex;gap:8px;flex-wrap:wrap}.summary-card .btn-row .btn{flex:0 1 auto;padding:10px 20px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#000;color:#fff;padding:8px 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12px;margin-bottom:12px}.install-title{font-size:1.18rem;font-weight:800;line-height:1.5;color:#fff;margin-bottom:10px;font-family:var(--font-bn)}.install-sub{font-size:.82rem;line-height:1.75;color:var(--text-secondary);margin-bottom:18px;font-family:var(--font-bn)}.install-steps{list-style:none;margin:0 0 20px;padding:0;display:flex;flex-direction:column;gap:10px;text-align:left}.install-steps li{display:flex;align-items:flex-start;gap:10px;font-size:.78rem;line-height:1.65;color:var(--text-secondary);font-family:var(--font-bn)}.install-steps li b{color:var(--accent)}.install-step-no{flex-shrink:0;width:22px;height:22px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:.68rem;font-weight:800;font-family:var(--font-ui);color:#000;background:linear-gradient(135deg,var(--accent),#0086ff);box-shadow:0 0 14px var(--accent-glow);margin-top:1px}.install-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}.install-actions .btn{justify-content:center;width:100%;min-height:46px;text-decoration:none}.install-hint{font-size:.68rem;line-height:1.6;color:var(--text-muted);font-family:var(--font-bn)}.install-hint b{color:var(--accent)}@media(max-width:360px){.install-actions{grid-template-columns:1fr}}.view{flex:1 1 auto;min-height:0;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;scrollbar-gutter:stable}.home-view,.studio-view,.referral-view,.interactive-view{display:flex;flex-direction:column;gap:14px;padding:10px 2px 96px}.studio-view[hidden],.referral-view[hidden],.interactive-view[hidden]{display:none}.quiz-view{display:flex;flex-direction:column;gap:8px;min-height:0;overflow:visible}.view[hidden]{display:none}.view-head{display:flex;align-items:center;gap:10px;flex-shrink:0}.view-title{font-size:.95rem;font-weight:800;color:#fff}.btn-sm{padding:7px 12px;font-size:.7rem;min-height:unset}.hero-card{background:var(--bg-card);border:1px solid 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0}.dropdown:disabled{opacity:.45;cursor:not-allowed}.studio-tile-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.studio-tile{display:flex;flex-direction:column;align-items:flex-start;gap:5px;padding:14px 12px;border-radius:var(--radius-btn);background:#0d131c;border:1.5px solid var(--border-subtle);color:var(--text-primary);font-family:var(--font-bn);cursor:pointer;transition:var(--transition);text-align:left;user-select:none;-webkit-user-select:none}.studio-tile:hover{border-color:var(--border-active);box-shadow:0 0 18px var(--accent-glow);transform:translateY(-1px)}.tile-emoji{font-size:1.35rem}.tile-title{font-size:.76rem;font-weight:800;line-height:1.4}.tile-sub{font-size:.62rem;color:var(--text-muted)}.studio-mode-tabs{display:flex;gap:8px}.studio-mode-tab{flex:1;padding:10px 8px;border-radius:var(--radius-btn);background:#0d131c;border:1.5px solid 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.drawer{transform:translate(0)}.drawer-topbar{display:flex;align-items:center;justify-content:space-between;padding:2px 4px}.drawer-title{font-size:.85rem;font-weight:800;color:var(--text-primary)}.drawer-profile{display:flex;flex-wrap:wrap;align-items:center;gap:10px;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-btn);padding:12px}.drawer-profile[hidden]{display:none}.drawer-avatar{width:42px;height:42px;border-radius:50%;border:2px solid var(--border-active);object-fit:cover;flex-shrink:0}.drawer-avatar-fallback{width:42px;height:42px;border-radius:50%;background:var(--accent-dim);border:2px solid var(--border-active);display:flex;align-items:center;justify-content:center;font-size:1.15rem;flex-shrink:0}.drawer-usermeta{display:flex;flex-direction:column;min-width:0;flex:1}.drawer-usermeta strong{font-size:.82rem;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.drawer-usermeta span{font-size:.64rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.drawer-badges{width:100%;display:flex;align-items:center;gap:8px}.role-badge{font-size:.6rem;font-weight:800;padding:3px 10px;border-radius:999px;background:#1a222e;color:var(--text-secondary);border:1px solid var(--border-subtle);letter-spacing:.04em;text-transform:uppercase}.role-badge.role-admin{color:#ffd767;background:#f59e0b21;border-color:#f59e0b80}.drawer-menu{display:flex;flex-direction:column;gap:6px}.drawer-item{display:flex;align-items:center;gap:10px;width:100%;padding:12px 14px;border-radius:var(--radius-btn);background:var(--bg-card);border:1px solid 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