:root{--quiz-bg-start: #1a1a2e;--quiz-bg-end: #16213e;--page-bg-start: var(--quiz-bg-start);--page-bg-end: var(--quiz-bg-end);--card-bg: rgba(255, 255, 255, .07);--card-border: rgba(255, 255, 255, .12);--card-glass: rgba(255, 255, 255, .04);--text-primary: #f0f0f5;--text-secondary: #b0b0c8;--accent-purple: #a855f7;--accent-blue: #3b82f6;--accent-pink: #ec4899;--accent-green: #22c55e;--accent-orange: #f97316;--accent-yellow: #eab308;--correct-bg: rgba(34, 197, 94, .15);--correct-border: #22c55e;--incorrect-bg: rgba(239, 68, 68, .15);--incorrect-border: #ef4444;--font-main: "Fredoka", sans-serif;--font-ui: "Nunito", sans-serif;--radius: 16px;--radius-sm: 10px;--shadow-card: 0 8px 32px rgba(0, 0, 0, .3);--shell-max-width: 700px;--shell-padding: 0 16px 80px;--star-opacity-base: .4;--star-opacity-start: .2;--star-opacity-end: .8;--star-scale-end: 1.4}.quiz-titlebar{position:sticky;top:0;z-index:200;display:flex;align-items:center;justify-content:space-between;padding:8px 20px;min-height:48px;background:#0f1117d1;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--card-border);box-shadow:0 2px 12px #00000059;animation:fadeSlideDown .4s ease-out}.quiz-titlebar-left{display:flex;align-items:center;gap:10px}.quiz-titlebar-right{display:flex;align-items:center;gap:10px;flex-shrink:0}.quiz-header-info{display:flex;flex-direction:column;gap:8px;align-items:flex-start;padding:20px 28px 12px;margin-bottom:0;background:#0f142359;border:1px solid var(--card-border);border-top:none;border-radius:0 0 var(--radius) var(--radius);animation:fadeSlideDown .5s ease-out;text-align:left}.quiz-shell-nav-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px;border-radius:50%;border:1px solid rgba(255,255,255,.16);background:#ffffff0a;color:var(--text-primary);font-family:var(--font-ui);font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .25s ease;line-height:1;white-space:nowrap;flex-shrink:0;width:36px;height:36px}.quiz-shell-nav-btn svg{flex-shrink:0;display:none}.quiz-shell-nav-btn span{display:none}.quiz-shell-nav-btn:hover{background:#ffffff24;border-color:#ffffff3d;transform:translateY(-1px)}.quiz-shell-nav-btn.is-close{background:#ffffff0d;border-color:#ffffff26;color:#e2e8f0}.quiz-shell-nav-btn.is-close:before{content:"\2715"}.quiz-shell-nav-btn.is-home:before{content:"\2302"}.quiz-shell-nav-btn.is-close:hover{background:#ef44441a;border-color:#ef44444d;color:#fca5a5;transform:translateY(-1px)}.quiz-shell-nav-btn.is-close:active{transform:scale(.95)}.quiz-score-pill{display:inline-flex;align-items:center;justify-content:center;padding:6px 12px;border-radius:99px;background:#3b82f629;border:1px solid rgba(147,197,253,.3);color:#bfdbfe;font-size:.8rem;font-weight:600;white-space:nowrap;margin-right:8px;font-family:var(--font-ui)}.quiz-title-container{display:flex;justify-content:flex-start;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:2px}.quiz-header-info h1{font-size:1.2rem;font-weight:700;background:linear-gradient(135deg,#e0e7ff,#a5b4fc);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:0;line-height:1.2;filter:drop-shadow(0 2px 4px rgba(0,0,0,.5))}.share-quiz-header-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:6px 14px;border-radius:99px;border:1px solid rgba(168,85,247,.35);background:linear-gradient(135deg,#a855f71f,#a855f70a);color:#d8b4fe;font-family:var(--font-ui);font-size:.8rem;font-weight:600;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);white-space:nowrap;flex-shrink:0}.share-quiz-header-btn:hover:not(:disabled){background:linear-gradient(135deg,#a855f740,#a855f726);border-color:#a855f799;transform:translateY(-1px);box-shadow:0 4px 12px #a855f740;color:#e9d5ff}.share-quiz-header-btn.copied{background:#22c55e4d;border-color:var(--accent-green);color:#fff;box-shadow:0 0 16px #22c55e66}.quiz-home-link-btn{display:inline-flex;align-items:center;gap:8px;margin-bottom:24px;padding:8px 18px;border-radius:99px;background:#ffffff14;border:1px solid rgba(255,255,255,.15);color:var(--text-primary);text-decoration:none;font-family:var(--font-ui);font-size:.95rem;font-weight:600;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 12px #0000001a}.quiz-home-link-btn:hover{background:#ffffff26;border-color:#ffffff40;transform:translateY(-2px);box-shadow:0 6px 16px #0003;color:#fff}.home-link-icon{width:20px;height:20px;border-radius:4px}.quiz-header-info .quiz-grade{font-family:var(--font-ui);font-size:.95rem;font-weight:700;color:var(--accent-purple);letter-spacing:.02em;margin-top:0}.quiz-header-info .quiz-meta-time-pill{font-family:var(--font-ui);font-size:.9rem;font-weight:600;color:var(--text-secondary);letter-spacing:.02em;margin-top:0;display:inline-flex;align-items:center}.quiz-header-info .quiz-meta-time-pill:empty{display:none}.quiz-header-info .quiz-meta{display:flex;justify-content:flex-start;align-items:center;gap:6px;margin-top:2px;font-size:.85rem;color:var(--text-secondary);font-family:var(--font-ui)}.quiz-header-info .quiz-meta span{display:inline-flex;align-items:center;gap:5px;font-weight:500;white-space:nowrap;opacity:.85}.quiz-header-info .quiz-meta span+span:before{content:"\b7";margin-right:6px;opacity:.4}.quiz-header-info .quiz-meta span:empty{display:none}.quiz-elapsed-timer{font-family:var(--font-main);font-size:.85rem;font-weight:600;color:#93c5fd;letter-spacing:.08em;font-variant-numeric:tabular-nums;white-space:nowrap}.quiz-elapsed-timer:empty{display:none}.quiz-progress{margin-bottom:24px}.quiz-progress-bar{height:10px;background:var(--card-bg);border-radius:99px;overflow:hidden;border:1px solid var(--card-border)}.quiz-progress-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--accent-purple),var(--accent-blue),var(--accent-pink));background-size:200% 100%;animation:shimmer 2s linear infinite;transition:width .4s ease}.quiz-progress-label{text-align:center;font-size:.85rem;font-weight:500;margin-top:8px;color:var(--text-secondary)}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}.question-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);padding:28px 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strong{color:#86efac;font-weight:800}.topic-breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:4px;margin-bottom:20px}.breadcrumb-chip{display:inline-flex;align-items:center;font-size:.75rem;font-weight:500;color:var(--text-secondary);white-space:nowrap;letter-spacing:.01em}.breadcrumb-chip:last-child{color:var(--text-primary);font-weight:600}.breadcrumb-arrow{color:var(--text-secondary);font-size:.65rem;opacity:.4}.question-number{font-size:.85rem;font-weight:600;color:#fff;background:#373741d9;display:inline-block;padding:2px 10px;border-radius:8px;margin-bottom:8px}.question-text{font-size:1.15rem;font-weight:500;line-height:1.5;margin-bottom:8px}.question-help-icon{display:inline-flex;align-items:center;justify-content:center;padding:1px 8px;border-radius:99px;background:linear-gradient(135deg,#a855f740,#ec489933);border:1.5px solid rgba(168,85,247,.45);color:#c084fc;font-size:.65rem;font-weight:700;font-family:var(--font-ui);letter-spacing:.03em;cursor:pointer;vertical-align:middle;margin-left:6px;transition:all .25s ease;position:relative;top:-1px;white-space:nowrap}.question-help-icon:hover{background:linear-gradient(135deg,#a855f773,#ec489959);border-color:var(--accent-purple);color:#e9d5ff;transform:scale(1.15);box-shadow:0 0 10px #a855f759}.question-help-icon:active{transform:scale(.95)}.question-help-icon:focus-visible{outline:2px solid var(--accent-purple);outline-offset:2px}.cheatsheet-row{display:flex;align-items:center;gap:12px;margin-top:16px}.question-image-wrapper{display:flex;justify-content:center;margin-bottom:20px}.question-image{max-width:100%;max-height:240px;object-fit:contain;border-radius:var(--radius-sm);border:2px solid var(--card-border);background:#fff;padding:8px;cursor:pointer;transition:all .2s ease}.question-image:hover{border-color:var(--accent-blue);box-shadow:0 4px 16px #3b82f633;transform:scale(1.02)}.choices-list{display:flex;flex-direction:column;gap:10px;list-style:none}.choice-btn{display:flex;align-items:center;gap:12px;width:100%;padding:14px 18px;border-radius:var(--radius-sm);border:2px solid var(--card-border);background:var(--card-glass);color:var(--text-primary);font-family:var(--font-main);font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease;text-align:left}.choice-btn:hover:not(:disabled){border-color:var(--accent-blue);background:#3b82f61a;transform:translate(4px)}.choice-btn:active:not(:disabled){transform:translate(2px) scale(.99)}.choice-letter{flex-shrink:0;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;background:#ffffff14;border:1px solid rgba(255,255,255,.15)}.choice-btn.correct{border-color:var(--correct-border);background:var(--correct-bg)}.choice-btn.correct .choice-letter{background:var(--correct-border);color:#fff}.choice-btn.incorrect{border-color:var(--incorrect-border);background:var(--incorrect-bg)}.choice-btn.incorrect .choice-letter{background:var(--incorrect-border);color:#fff}.choice-btn:disabled{cursor:default;opacity:.7}.choice-btn.correct:disabled,.choice-btn.incorrect:disabled{opacity:1}.explanation-panel{margin-top:16px;padding:16px 18px;border-radius:var(--radius-sm);font-size:.95rem;line-height:1.5;animation:fadeSlideUp .3s ease-out}.explanation-panel.correct{background:var(--correct-bg);border-left:4px solid var(--correct-border)}.explanation-panel.incorrect{background:var(--incorrect-bg);border-left:4px solid var(--incorrect-border)}.explanation-panel .explanation-header{font-weight:700;font-size:1rem;margin-bottom:6px}.cheatsheet-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:99px;border:2px solid rgba(168,85,247,.3);background:linear-gradient(135deg,#a855f726,#ec489926);color:#c084fc;font-family:var(--font-main);font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease}.cheatsheet-btn:hover{transform:translateY(-2px);border-color:var(--accent-purple);box-shadow:0 4px 20px #a855f74d}.cheatsheet-btn .btn-icon{font-size:1.1rem}.cheatsheet-btn .btn-sparkle{animation:sparkle-pulse 1.5s ease-in-out infinite}@keyframes sparkle-pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.6;transform:scale(1.2)}}.next-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;margin-top:20px;padding:14px 24px;border-radius:var(--radius-sm);border:none;background:linear-gradient(135deg,var(--accent-purple),var(--accent-blue));color:#fff;font-family:var(--font-main);font-size:1.05rem;font-weight:600;cursor:pointer;transition:all .3s ease}.next-btn:hover{transform:translateY(-2px);box-shadow:0 6px 24px #3b82f666}.quiz-lightbox{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;background:#000000bf;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);opacity:0;pointer-events:none;transition:opacity .3s ease}.quiz-lightbox.open{opacity:1;pointer-events:auto}.quiz-lightbox-dialog{background:var(--quiz-bg-start);width:100vw;height:100vh;height:100dvh;border-radius:0;box-shadow:0 24px 60px #00000080;display:flex;flex-direction:column;overflow:hidden;transform:scale(.95);opacity:0;transition:all .3s cubic-bezier(.16,1,.3,1);border:none}.quiz-lightbox.open .quiz-lightbox-dialog{transform:scale(1);opacity:1}.quiz-lightbox-header{padding:14px 20px;border-bottom:1px solid var(--card-border);display:flex;align-items:center;justify-content:space-between;background:#ffffff08;flex-shrink:0}.quiz-lightbox-title{margin:0;font-family:var(--font-main);font-size:1rem;font-weight:600;color:var(--text-primary);display:flex;align-items:center;gap:10px;flex-wrap:wrap;min-width:0;overflow:hidden}.lightbox-title-label{white-space:nowrap;flex-shrink:0}.lightbox-breadcrumbs{display:flex;align-items:center;gap:4px;flex-wrap:wrap;font-size:.8rem;font-weight:500}.lightbox-breadcrumb-chip{background:#8b5cf626;color:#c4b5fd;padding:2px 8px;border-radius:10px;white-space:nowrap;font-size:.75rem}.lightbox-breadcrumb-sep{color:var(--text-secondary);opacity:.5;font-size:.65rem}.quiz-lightbox-close{background:none;border:none;color:var(--text-secondary);font-size:1.3rem;cursor:pointer;padding:4px 8px;line-height:1;transition:all .2s ease;border-radius:6px}.quiz-lightbox-close:hover{color:var(--text-primary);background:#ef444433}.quiz-lightbox-body{flex:1;background:#fff;position:relative;overflow:hidden}.quiz-lightbox-iframe{width:100%;height:100%;border:none;display:none}.quiz-lightbox-img{width:100%;height:100%;object-fit:contain;display:none}.score-card{text-align:center;background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);padding:24px;backdrop-filter:blur(12px);box-shadow:var(--shadow-card);animation:fadeSlideUp .5s ease-out}.quiz-turbo-badge{display:inline-flex;align-items:center;justify-content:center;gap:6px;margin:0 auto 14px;padding:6px 12px;border:1px solid rgba(251,191,36,.48);border-radius:999px;background:#fbbf241f;color:#fde68a;font-family:var(--font-ui);font-size:.78rem;font-weight:800;line-height:1.2;box-shadow:0 10px 24px #fbbf2414}.score-emoji{font-size:4rem;margin-bottom:12px;animation:bounceIn .6s ease-out}.score-title{font-size:1.8rem;font-weight:700;background:linear-gradient(135deg,var(--accent-purple),var(--accent-pink));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px}.score-value{display:inline-flex;align-items:center;justify-content:center;min-width:136px;min-height:88px;margin:2px auto 8px;padding:8px 22px;border-radius:var(--radius);border:1px solid rgba(168,85,247,.35);background:linear-gradient(135deg,#a855f733,#3b82f624);color:#fff;font-size:3rem;font-weight:700;box-shadow:0 14px 32px #3b82f629}.score-message{max-width:520px;margin:0 auto 20px;font-family:var(--font-ui);font-size:1rem;font-weight:700;color:var(--text-secondary);line-height:1.4}.score-breakdown{display:flex;justify-content:center;gap:32px;margin-bottom:24px}.score-stat{text-align:center}.score-stat-value{font-size:1.8rem;font-weight:700}.score-stat-value.green{color:var(--accent-green)}.score-stat-value.red{color:var(--incorrect-border)}.score-stat-label{font-size:.8rem;color:var(--text-secondary)}.review-list{margin-top:32px;text-align:left}.review-list h3{font-size:1.1rem;margin-bottom:16px;color:var(--text-secondary)}.review-item{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;border-radius:var(--radius-sm);margin-bottom:8px;background:var(--card-glass);border:1px solid var(--card-border);font-size:.9rem}.review-icon{flex-shrink:0;font-size:1.2rem;margin-top:2px}.review-item-text{flex:1}.review-item-answer{color:var(--text-secondary);font-size:.8rem;margin-top:4px}.retry-btn{display:inline-flex;align-items:center;gap:8px;margin-top:24px;padding:12px 32px;border-radius:99px;border:none;background:linear-gradient(135deg,var(--accent-purple),var(--accent-blue));color:#fff;font-family:var(--font-main);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease}.retry-btn:hover{transform:translateY(-2px);box-shadow:0 6px 24px #3b82f666}.share-btn{display:inline-flex;align-items:center;gap:8px;margin-top:12px;padding:10px 28px;border-radius:99px;border:2px solid rgba(34,197,94,.3);background:#22c55e1f;color:#4ade80;font-family:var(--font-main);font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease}.share-btn:hover{transform:translateY(-2px);border-color:var(--accent-green);background:#22c55e33;box-shadow:0 4px 20px #22c55e4d}.share-btn:disabled{cursor:default;opacity:.8}.challenge-card{display:flex;flex-direction:column;align-items:center;gap:14px;max-width:560px;margin:20px auto 0;padding:18px;border-radius:var(--radius);border:1px solid rgba(250,204,21,.28);background:linear-gradient(135deg,#facc151c,#22c55e14),var(--card-glass);overflow:hidden;box-shadow:0 14px 34px #0f172a38}.challenge-card-badge{display:inline-flex;align-items:center;justify-content:center;min-height:28px;padding:0 12px;border-radius:99px;border:1px solid rgba(250,204,21,.35);background:#facc151f;color:#fde68a;font-family:var(--font-ui);font-size:.78rem;font-weight:800}.challenge-card-text{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center}.challenge-card-headline{font-family:var(--font-main);font-size:1.25rem;font-weight:700;color:var(--text-primary);line-height:1.3;margin:0}.challenge-card-subtext{font-family:var(--font-ui);font-size:.9rem;font-weight:600;color:var(--text-secondary);line-height:1.4}.challenge-share-btn,.simple-share-link{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;max-width:100%;padding:0 22px;border-radius:99px;color:#fff;font-family:var(--font-main);font-size:.95rem;font-weight:700;line-height:1.25;text-align:center;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease,opacity .2s ease;white-space:normal}.challenge-share-btn{border:1px solid rgba(168,85,247,.42);background:linear-gradient(135deg,var(--accent-purple),var(--accent-blue));box-shadow:0 12px 28px #3b82f642}.challenge-share-btn svg,.simple-share-link svg{width:18px;height:18px;flex-shrink:0}.challenge-share-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 16px 34px #3b82f657}.challenge-share-btn:active:not(:disabled){transform:translateY(0)}.challenge-share-btn:disabled,.simple-share-link:disabled{cursor:default;opacity:.72}.challenge-share-btn.copied,.simple-share-link.copied{border-color:#22c55e6b;background:linear-gradient(135deg,#22c55ed1,#14b8a6c7);box-shadow:0 12px 28px #22c55e38}.share-toast{margin-top:10px;text-align:center;font-family:var(--font-main);font-size:.9rem;font-weight:600;color:#4ade80;opacity:0;transform:translateY(6px);transition:opacity .3s ease,transform .3s ease;pointer-events:none;min-height:1.4em}.share-toast.visible{opacity:1;transform:translateY(0)}.quiz-share-reward-status{display:flex;flex-direction:column;align-items:center;gap:4px;margin:14px 0 0;padding:12px 14px;border-radius:var(--radius-sm);border:1px solid rgba(34,197,94,.28);background:#22c55e17;color:#86efac;font-family:var(--font-ui);text-align:center;animation:fadeSlideUp .3s ease-out}.quiz-share-reward-status[hidden]{display:none}.quiz-share-reward-status.muted{border-color:#ffffff29;background:#ffffff0f;color:var(--text-secondary)}.quiz-share-reward-main{font-weight:800}.quiz-share-reward-note{font-size:.78rem;color:var(--text-muted)}.simple-share-link{margin-top:16px;border:1px solid rgba(255,255,255,.16);background:#ffffff12;color:var(--text-primary)}.simple-share-link:hover:not(:disabled){color:var(--text-primary);border-color:#a855f76b;background:linear-gradient(135deg,#a855f72e,#3b82f61f);transform:translateY(-2px);box-shadow:0 10px 24px 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