:root{--bg-primary: transparent;--bg-fallback: #1a0a3e;--bg-card: rgba(255, 255, 255, .08);--bg-card-solid: rgba(30, 15, 70, .85);--bg-card-hover: rgba(255, 255, 255, .12);--bg-panel: rgba(20, 10, 60, .55);--bg-panel-strong: rgba(20, 10, 60, .75);--bg-overlay: rgba(10, 5, 30, .85);--bg-nav: rgba(20, 10, 55, .88);--text-primary: #ffffff;--text-secondary: #c8b8f0;--text-muted: #8878b0;--accent-green: #00ff88;--accent-red: #ff3355;--accent-gold: #ffcc00;--accent-blue: #44aaff;--accent-cyan: #00eeff;--accent-purple: #bb66ff;--accent-orange: #ff8800;--accent-pink: #ff44aa;--accent-yellow: #ffee44;--grad-primary: linear-gradient(135deg, #44aaff, #bb66ff);--grad-green: linear-gradient(135deg, #00ff88, #00cc66);--grad-gold: linear-gradient(135deg, #ffee44, #ffaa00);--grad-red: linear-gradient(135deg, #ff5566, #dd0033);--grad-hero: linear-gradient(135deg, #6644cc 0%, #aa44ff 50%, #44aaff 100%);--grad-panel: linear-gradient(145deg, rgba(60, 30, 120, .5), rgba(20, 10, 60, .6));--grad-card: 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var(--safe-right);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 -2px 20px #0000004d}.bottom-nav.hidden{display:none}.nav-item{display:flex;flex-direction:column;align-items:center;gap:2px;cursor:pointer;padding:4px 12px;opacity:.4;transition:all .2s;font-size:9px;font-weight:700;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.3px;background:none;border:none;font-family:inherit}.nav-item.active,.nav-item[aria-current=true]{opacity:1;color:var(--accent-cyan)}.nav-item.active .nav-icon,.nav-item[aria-current=true] .nav-icon{transform:scale(1.2);text-shadow:0 0 10px rgba(0,238,255,.5)}.nav-icon{font-size:20px;transition:transform 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.val{font-size:18px;font-weight:900}.post-stat .label{font-size:9px;color:var(--text-muted);text-transform:uppercase}.review-card{background:var(--bg-card);border-radius:var(--radius-md);padding:14px;margin:8px 0;border-left:4px solid var(--accent-red);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.review-card h4{font-size:13px;margin-bottom:4px}.review-card p{font-size:11px;color:var(--text-secondary);line-height:1.4}.tag{display:inline-block;padding:3px 8px;border-radius:8px;font-size:9px;font-weight:700;margin:1px}.tag-correct{background:#00ff881f;color:var(--accent-green)}.tag-wrong{background:#ff33551f;color:var(--accent-red)}.tag-subject{background:#44aaff1f;color:var(--accent-blue)}#quickReviewOverlay{position:fixed;top:0;left:0;width:100%;height:100%;z-index:20;background:var(--bg-overlay);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:none;flex-direction:column;align-items:center;justify-content:center;padding:20px}#quickReviewOverlay.active{display:flex}.quick-review-card{background:var(--bg-card-solid);border-radius:var(--radius-xl);padding:30px;max-width:380px;width:100%;text-align:center;box-shadow:0 20px 60px #0006;border:var(--border-glow)}.qr-buzzwords{font-size:16px;font-weight:800;margin-bottom:12px;color:#fff}.qr-answer{font-size:20px;font-weight:900;color:var(--accent-green);margin:12px 0}.qr-teaching{font-size:12px;color:var(--text-secondary);line-height:1.5;margin:8px 0}.qr-counter{font-size:11px;color:var(--text-muted);margin-bottom:8px}.qr-divider{margin-top:14px}.qr-buttons{display:flex;gap:8px;margin-top:14px}.qr-buttons .btn{flex:1}.shop-item{display:flex;align-items:center;gap:10px;background:var(--grad-card);border-radius:var(--radius-md);padding:12px;margin:6px 0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);transition:transform .15s,box-shadow .2s}.shop-item:hover{transform:translateY(-1px);box-shadow:var(--shadow-card-hover)}.shop-item.equipped{border-color:var(--accent-cyan);box-shadow:var(--shadow-glow-cyan)}.quest-item{background:var(--grad-card);border-radius:var(--radius-md);padding:12px;margin:6px 0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.quest-title{font-size:12px;font-weight:800}.quest-bar{height:6px;background:#ffffff14;border-radius:3px;margin-top:6px;overflow:hidden}.quest-fill{height:100%;background:var(--grad-primary);border-radius:3px;transition:width .5s ease}.quest-reward{font-size:10px;color:var(--accent-gold);margin-top:4px;font-weight:700}.achievement-item{display:flex;align-items:center;gap:12px;background:var(--grad-card);border-radius:var(--radius-md);padding:14px;margin:6px 0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);transition:all .2s}.achievement-item.unlocked{border-color:#fc06;box-shadow:var(--shadow-glow-gold)}.achievement-item.locked{opacity:.4}.achievement-icon{font-size:30px;width:44px;height:44px;display:flex;align-items:center;justify-content:center;flex-shrink:0;background:#ffffff0f;border-radius:var(--radius-sm)}.achievement-info{flex:1}.achievement-name{font-size:14px;font-weight:800}.achievement-item.unlocked .achievement-name{color:var(--accent-gold)}.achievement-desc{font-size:11px;color:var(--text-muted);margin-top:2px}.card-form label{font-size:12px;color:var(--text-secondary);display:block;margin-bottom:4px;font-weight:700}.card-form input,.card-form textarea,.card-form select{width:100%;padding:12px;border-radius:var(--radius-sm);background:#1e0f4699;color:#fff;border:1px solid rgba(187,102,255,.15);font-size:14px;margin-bottom:12px;font-family:inherit;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.card-form textarea{resize:vertical}.card-form input:focus,.card-form textarea:focus,.card-form select:focus{outline:none;border-color:var(--accent-cyan);box-shadow:0 0 0 3px #00eeff26}.card-form .why-input{font-size:12px;color:var(--text-secondary);padding:10px}.import-export-area{width:100%;padding:12px;border-radius:var(--radius-sm);background:#1e0f4699;color:#fff;border:1px solid rgba(187,102,255,.15);font-size:12px;font-family:monospace;resize:vertical}.mp-panel{background:var(--grad-card);border-radius:var(--radius-lg);padding:16px;margin:10px 0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);max-width:380px;width:100%}.mp-panel h3{font-size:14px;font-weight:800;margin-bottom:8px}.mp-room-code{font-size:28px;font-weight:900;letter-spacing:6px;color:var(--accent-cyan);text-align:center;font-family:monospace;margin:8px 0;text-shadow:0 0 12px rgba(0,238,255,.4)}.mp-status{font-size:12px;color:var(--text-secondary);text-align:center}#multiplayerOverlay{position:fixed;top:0;left:0;width:100%;height:100%;z-index:20;background:var(--bg-overlay);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:none;flex-direction:column;align-items:center;justify-content:center;padding:20px}#multiplayerOverlay.active{display:flex}.opponent-hud{margin:4px auto 0;max-width:360px;display:flex;justify-content:center;align-items:center;gap:9px;padding:5px 10px;border-radius:12px;background:#140a3cd1;border:1px solid rgba(255,68,170,.35);box-shadow:0 0 14px #ff44aa1f;color:#fff;font-size:10px;font-weight:700;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.opponent-hud b{color:var(--accent-pink)}.opponent-hud[hidden]{display:none}.confetti-piece{position:fixed;z-index:25;pointer-events:none;width:8px;height:8px;border-radius:2px;animation:confettiFall 1.5s ease-out forwards}@keyframes confettiFall{0%{opacity:1;transform:translateY(0) rotate(0) scale(1)}to{opacity:0;transform:translateY(100vh) rotate(720deg) scale(.3)}}.new-best-banner{position:fixed;top:20%;left:50%;transform:translate(-50%);z-index:25;pointer-events:none;font-size:30px;font-weight:900;color:var(--accent-gold);text-shadow:0 0 24px rgba(255,204,0,.6),0 2px 4px rgba(0,0,0,.4);text-transform:uppercase;letter-spacing:4px;animation:newBestPulse 2s ease-out forwards}@keyframes newBestPulse{0%{opacity:0;transform:translate(-50%) scale(.5)}20%{opacity:1;transform:translate(-50%) scale(1.2)}40%{transform:translate(-50%) scale(1)}80%{opacity:1}to{opacity:0;transform:translate(-50%) translateY(-30px)}}.rush-vignette{position:fixed;top:0;left:0;width:100%;height:100%;z-index:4;pointer-events:none;box-shadow:none;transition:box-shadow .3s ease-in-out}.rush-vignette.active{box-shadow:inset 0 0 100px 50px #ff640073}.coin-trail-dot{position:fixed;width:8px;height:8px;border-radius:50%;background:var(--accent-gold);box-shadow:0 0 8px #ffcc00b3,0 0 16px #fc06;pointer-events:none;z-index:20;transform:translate(-50%,-50%);transition:left .3s ease-in,top .3s ease-in,opacity .3s ease-in,transform .3s ease-in;opacity:1}#hudSpeedTimer{color:var(--accent-cyan);font-size:10px;font-family:monospace;letter-spacing:.5px}.muted{color:var(--text-muted);font-size:12px;margin-bottom:14px}.gold{color:var(--accent-gold)}.bold{font-weight:700}.stat-row{display:flex;gap:6px;justify-content:center;margin:10px 0;flex-wrap:wrap}.stat-pill{background:var(--grad-card);border-radius:var(--radius-md);padding:8px 14px;text-align:center;min-width:65px;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);transition:transform .15s,box-shadow .2s}.stat-pill:hover{transform:translateY(-2px);box-shadow:var(--shadow-card-hover)}.stat-pill .val{font-size:16px;font-weight:900;color:var(--accent-gold)}.stat-pill .label{font-size:9px;color:var(--text-muted);margin-top:2px;text-transform:uppercase;letter-spacing:.5px}.fc-buzzwords{font-size:16px;font-weight:800;color:#fff;text-transform:uppercase;letter-spacing:.5px;line-height:1.4;margin-bottom:10px}.fc-meta{margin-top:6px;margin-bottom:8px}.fc-answer{font-size:20px;font-weight:900;color:var(--accent-green);margin:14px 0 8px;text-shadow:0 0 10px rgba(0,255,136,.3)}.fc-teaching{font-size:12px;color:var(--text-secondary);line-height:1.6;margin:8px 0;padding:10px;background:#ffffff0a;border-radius:var(--radius-sm);border-left:3px solid var(--accent-cyan)}.fc-distractors{font-size:11px;color:var(--text-muted);margin:6px 0;padding:6px 10px;background:#ffffff08;border-radius:var(--radius-sm)}.fc-why-wrong{margin-top:8px}.fc-ww-item{font-size:11px;color:var(--text-secondary);line-height:1.5;padding:5px 0;border-bottom:1px solid rgba(187,102,255,.06)}.fc-ww-item:last-child{border-bottom:none}.fc-progress-bar{width:100%;height:4px;background:#ffffff14;border-radius:2px;margin:8px 0;overflow:hidden}.fc-progress-fill{height:100%;background:var(--grad-primary);border-radius:2px;transition:width .4s ease}#cardBrowserContent{margin-top:8px}.card-browser-search{width:100%;padding:12px 14px;border-radius:var(--radius-md);background:#1e0f4699;color:#fff;border:1px solid rgba(187,102,255,.15);font-size:14px;margin-bottom:10px;font-family:inherit}.card-browser-search:focus{outline:none;border-color:var(--accent-cyan);box-shadow:0 0 0 3px #00eeff26}.card-browser-search::placeholder{color:var(--text-muted)}.card-browser-filters{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}.card-browser-filter-chip{padding:5px 10px;border-radius:var(--radius-sm);font-size:10px;font-weight:700;background:var(--bg-card);color:var(--text-secondary);cursor:pointer;border:1px solid transparent;transition:all .2s;white-space:nowrap}.card-browser-filter-chip.active{background:#44aaff26;color:var(--accent-cyan);border-color:var(--accent-cyan)}.card-browser-filter-chip:hover{border-color:#bb66ff4d}.card-browser-stats{font-size:11px;color:var(--text-muted);margin-bottom:8px;padding:6px 0;border-bottom:1px solid rgba(187,102,255,.08)}.card-browser-item{background:var(--bg-card);border-radius:var(--radius-md);padding:12px;margin:6px 0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);transition:all .2s;cursor:pointer}.card-browser-item:hover{transform:translateY(-1px);box-shadow:var(--shadow-card-hover)}.card-browser-item.disabled-card{opacity:.45;border-left:3px solid var(--accent-red)}.card-browser-item.missed-card{border-left:3px solid var(--accent-red)}.card-browser-item .cb-buzzwords{font-size:12px;font-weight:700;color:#fff;margin-bottom:4px;line-height:1.3}.card-browser-item .cb-answer{font-size:13px;font-weight:800;color:var(--accent-green);margin-bottom:4px}.card-browser-item .cb-meta{display:flex;gap:4px;flex-wrap:wrap;align-items:center}.card-browser-item .cb-difficulty{display:inline-flex;gap:1px;font-size:8px}.card-browser-toggle{display:inline-flex;align-items:center;gap:4px;font-size:10px;color:var(--text-muted);cursor:pointer;padding:3px 8px;border-radius:6px;background:#ffffff0a;border:1px solid rgba(187,102,255,.1);transition:all .2s}.card-browser-toggle:hover{background:#ff33551a;border-color:#ff33554d;color:var(--accent-red)}.card-browser-toggle.enabled{background:#00ff8814;border-color:#0f83;color:var(--accent-green)}.card-browser-list{max-height:60vh;overflow-y:auto;scrollbar-width:none;-ms-overflow-style:none}.card-browser-list::-webkit-scrollbar{display:none}.card-browser-load-more{text-align:center;padding:12px;font-size:11px;color:var(--text-muted);cursor:pointer}#profileContent{text-align:center}.profile-header{text-align:center;padding:16px 0}.profile-avatar{width:80px;height:80px;border-radius:50%;background:var(--grad-primary);display:flex;align-items:center;justify-content:center;font-size:36px;margin:0 auto 10px;border:3px solid var(--accent-cyan);box-shadow:var(--shadow-glow-cyan);cursor:pointer;transition:transform .15s,box-shadow .2s}.profile-avatar:hover{transform:scale(1.05);box-shadow:0 0 30px #0ef6}.profile-name{font-size:22px;font-weight:900;color:#fff;margin-bottom:2px}.profile-name-input{background:transparent;border:none;border-bottom:2px solid rgba(187,102,255,.3);color:#fff;font-size:20px;font-weight:800;text-align:center;padding:4px 8px;outline:none;width:200px;max-width:80%;font-family:inherit;transition:border-color .2s}.profile-name-input:focus{border-color:var(--accent-cyan)}.profile-name-input::placeholder{color:var(--text-muted)}.profile-streak-badge{font-size:12px;color:var(--accent-gold);font-weight:700;margin-top:2px}.profile-stats-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin:14px 0}.profile-stat{background:var(--grad-card);border-radius:var(--radius-md);padding:10px 6px;text-align:center;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.profile-stat .val{font-size:18px;font-weight:900;color:var(--accent-gold)}.profile-stat .label{font-size:8px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.3px;margin-top:2px}.profile-badges h4{font-size:13px;font-weight:800;color:var(--text-secondary);margin-bottom:8px;text-align:left}.profile-badge-grid{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.profile-badge{width:48px;height:48px;border-radius:var(--radius-sm);background:var(--bg-card);border:var(--border-card);display:flex;align-items:center;justify-content:center;font-size:22px;cursor:pointer;transition:all .2s;box-shadow:var(--shadow-card)}.profile-badge.selected{border-color:var(--accent-gold);box-shadow:var(--shadow-glow-gold);background:#ffcc0014}.profile-badge:hover{transform:scale(1.1)}.profile-badge.empty{opacity:.3;font-size:14px;color:var(--text-muted)}.profile-section{background:var(--grad-card);border-radius:var(--radius-lg);padding:14px;margin:10px 0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);text-align:left}.profile-section h4{font-size:13px;font-weight:800;color:var(--text-secondary);margin-bottom:8px}.profile-visibility-toggle{display:flex;justify-content:space-between;align-items:center;padding:8px 0;font-size:12px;color:var(--text-secondary)}.profile-picture-selector{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}.profile-pic-option{width:40px;height:40px;border-radius:50%;background:var(--bg-card);display:flex;align-items:center;justify-content:center;font-size:18px;cursor:pointer;border:2px solid transparent;transition:all .2s}.profile-pic-option.active{border-color:var(--accent-cyan);box-shadow:var(--shadow-glow-cyan)}.profile-pic-option:hover{transform:scale(1.1)}#howToPlaySection{margin-top:10px}#howToPlaySection h4{font-size:13px;font-weight:800;color:var(--text-secondary);margin-bottom:6px}#howToPlaySection details{margin-bottom:4px;background:var(--bg-card);border-radius:var(--radius-sm);padding:0;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);overflow:hidden;transition:border-color .2s}#howToPlaySection details[open]{border-color:#0ef3}#howToPlaySection details summary{font-size:12px;font-weight:700;cursor:pointer;padding:8px 12px;list-style:none;display:flex;align-items:center;gap:4px;transition:color .2s}#howToPlaySection details summary::-webkit-details-marker{display:none}#howToPlaySection details summary:after{content:"▸";margin-left:auto;font-size:10px;color:var(--text-muted);transition:transform .2s}#howToPlaySection details[open] summary:after{transform:rotate(90deg)}#howToPlaySection details summary:hover{color:var(--accent-cyan)}#howToPlaySection details p{font-size:11px;color:var(--text-secondary);margin:0;padding:0 12px 10px;line-height:1.55}#examFilterContainer{margin:8px 0}.exam-filter-section{background:var(--grad-card);border-radius:var(--radius-md);padding:10px 14px;border:var(--border-card);box-shadow:var(--shadow-card);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.exam-filter-section h4{font-size:12px;font-weight:700;color:var(--text-secondary);margin-bottom:6px}.exam-filter-chips{display:flex;gap:6px;flex-wrap:wrap}.exam-chip{padding:5px 10px;border-radius:var(--radius-sm);font-size:10px;font-weight:700;background:var(--bg-card);color:var(--text-secondary);cursor:pointer;border:1px solid transparent;transition:all .2s;white-space:nowrap}.exam-chip.selected{background:#00ff881f;color:var(--accent-green);border-color:var(--accent-green);box-shadow:var(--shadow-glow-green)}.exam-chip:hover{border-color:#bb66ff4d}.mp-mode-grid{display:flex;flex-direction:column;gap:8px;margin:10px 0}.mp-mode-card{background:var(--grad-card);border-radius:var(--radius-md);padding:14px;border:2px solid rgba(187,102,255,.15);cursor:pointer;transition:all 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