:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#000000de;background-color:#fff}.app-shell{font-family:sans-serif;min-height:100vh;display:block;padding:calc(24px + env(safe-area-inset-top)) calc(20px + env(safe-area-inset-right)) calc(20px + env(safe-area-inset-bottom)) calc(20px + env(safe-area-inset-left));background-color:#f0f0f0}.app-shell .quiz-wrapper{width:100%;box-sizing:border-box;max-width:1100px;padding:clamp(12px,2.2vw,24px);margin:0 auto}.app-shell .quiz-wrapper .quiz-card{display:flex;flex-direction:row;gap:20px;background-color:#fdfdfd;padding:clamp(12px,2.5vw,20px);border-radius:12px;box-shadow:0 0 10px #0000001a;color:#00f}@media (max-width: 767px){.app-shell .quiz-wrapper .quiz-card{flex-direction:column}}.app-shell .quiz-wrapper .quiz-card .quiz-left{flex:1}.app-shell .quiz-wrapper .quiz-title{margin-bottom:16px;font-size:clamp(1.2rem,2.2vw,1.6rem)}.app-shell .quiz-wrapper .quiz-card .quiz-question{font-weight:700;color:#00f;font-size:clamp(1rem,1.8vw,1.2rem)}.app-shell .quiz-wrapper .quiz-card .options{list-style:none;padding:0}.app-shell .quiz-wrapper .quiz-card .option{padding:clamp(8px,1.2vw,10px) clamp(12px,1.6vw,16px);border-radius:8px;margin-bottom:clamp(8px,1.2vw,10px);background-color:#f1f1f1;color:#333;transition:all .2s;cursor:default}.app-shell .quiz-wrapper .quiz-card .option.selectable{cursor:pointer}.app-shell .quiz-wrapper .quiz-card .option.selectable:hover{background-color:#e2e2e2}.app-shell .quiz-wrapper .quiz-card .option.correct{background-color:#d4edda;color:green}.app-shell .quiz-wrapper .quiz-card .option.wrong-selected{background-color:#f8d7da}.app-shell .quiz-wrapper .quiz-card .next-btn{margin-top:clamp(8px,1.2vw,12px);padding:clamp(6px,1.2vw,8px) clamp(12px,1.6vw,16px);background-color:#007bff;color:#fff;border:none;border-radius:6px}.app-shell .quiz-wrapper .quiz-card .explanation{flex:1;background-color:#f0f8ff;padding:clamp(12px,2vw,20px);border-radius:10px;font-size:1.2rem;line-height:1.6;color:#333}.app-shell .quiz-wrapper .result{text-align:center;background-color:#fefefe;padding:clamp(14px,2.5vw,24px);border-radius:12px;box-shadow:0 0 10px #0000001a}.app-shell .quiz-wrapper .result+.result{margin-top:clamp(12px,2vw,20px)}.app-shell .quiz-wrapper .subject-chooser{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;align-items:stretch;justify-items:stretch}.app-shell .quiz-wrapper .explanation-text{margin-top:10px;font-style:italic}.app-shell .quiz-wrapper .subject-card{display:grid;grid-template-columns:64px 1fr;gap:16px;align-items:flex-start;padding:clamp(12px,2vw,16px);border-radius:12px;border:1px solid #e5e7eb;background:#fff;box-shadow:0 1px 2px #0000000a;text-align:left;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease,background .12s ease}.app-shell .quiz-wrapper .subject-card:hover{transform:translateY(-2px);box-shadow:0 8px 20px #00000014;background:#fcfcff}.app-shell .quiz-wrapper .subject-card:focus-visible{outline:3px solid #3b82f6;outline-offset:2px}.app-shell .quiz-wrapper .subject-card .icon{height:clamp(48px,6vw,64px);width:clamp(48px,6vw,64px);border-radius:12px;display:grid;place-items:center;font-size:clamp(22px,2.4vw,28px);color:#1f2937;align-self:flex-start}.app-shell .quiz-wrapper .subject-card .content{display:grid;gap:6px}.app-shell .quiz-wrapper .subject-card .title{font-weight:700;font-size:clamp(1rem,1.8vw,1.08rem);color:#111827}.app-shell .quiz-wrapper .subject-card .desc{color:#4b5563;font-size:clamp(.9rem,1.6vw,.95rem)}.app-shell .quiz-wrapper .subject-card .icon.plu{background:#e0f2fe}.app-shell .quiz-wrapper .subject-card .icon.apt{background:#e9d5ff}.app-shell .quiz-wrapper .gated-wrapper{position:relative;display:grid;gap:8px}.app-shell .quiz-wrapper .gated-card{position:relative}.app-shell .quiz-wrapper .gated-card.unlocked{border-color:#16a34a;box-shadow:0 0 0 1px #16a34a40,0 4px 14px -4px #16a34a59}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel{margin-top:12px;grid-column:1 / -1;display:grid;gap:8px;background:#f8fafc;border:1px solid #e2e8f0;padding:12px 14px;border-radius:10px;animation:fadeSlide .18s ease}@keyframes fadeSlide{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-label{font-size:.8rem;font-weight:600;display:grid;gap:4px;color:#334155}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-input{font:inherit;padding:6px 8px;border:1px solid #cbd5e1;border-radius:6px;background:#fff}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-input:focus-visible{outline:2px solid #3b82f6;outline-offset:1px}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-btn,.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .cancel-unlock-btn{font:inherit;padding:6px 12px;border-radius:6px;border:1px solid #64748b;background:#fff;cursor:pointer;transition:background .12s ease,transform .05s ease}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-btn{background:#0d9488;color:#fff;border-color:#0d9488}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-btn:hover{background:#0f766e}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .cancel-unlock-btn:hover{background:#f1f5f9}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-btn:active,.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .cancel-unlock-btn:active{transform:translateY(1px)}.app-shell .quiz-wrapper .gated-wrapper .unlock-panel .unlock-error{font-size:.75rem;color:#b91c1c;background:#fee2e2;border:1px solid #fecaca;padding:6px 8px;border-radius:6px}.app-shell .quiz-wrapper .helper-text{margin-top:10px;color:#6b7280;font-size:.9rem}.app-shell .quiz-wrapper .warning-text{margin-top:6px;color:#ef4444}.app-shell .quiz-wrapper .top-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:10px 14px;background:#fff;border:1px solid #e5e7eb;border-radius:10px;margin-bottom:16px}.app-shell .quiz-wrapper .subject-pill{display:inline-flex;align-items:center;gap:8px;padding:6px 10px;border-radius:9999px;background:#f3f4f6;color:#111827}.app-shell .quiz-wrapper .pill-icon{font-size:16px}.app-shell .quiz-wrapper .pill-text{font-weight:600}.app-shell .quiz-wrapper .cancel-btn{border:1px solid #ef4444;color:#fff;background:#ef4444;padding:8px 12px;border-radius:8px;cursor:pointer;transition:background .12s ease,transform .05s ease}.app-shell .quiz-wrapper .cancel-btn:hover{background:#dc2626}.app-shell .quiz-wrapper .cancel-btn:active{transform:translateY(1px)}.app-shell .quiz-wrapper .header-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.app-shell .quiz-wrapper .app-title{margin:0;font-size:clamp(1rem,2.2vw,1.25rem)}@media (max-width: 640px){.app-shell .quiz-wrapper .header-bar{flex-direction:column;align-items:flex-start;gap:8px}}@media (max-height: 600px){.app-shell{padding:12px}.app-shell .quiz-wrapper .quiz-card{flex-direction:column;gap:12px}.app-shell .quiz-wrapper .result{padding:12px}}@media (min-aspect-ratio: 16/9) and (min-width: 1200px){.app-shell .quiz-wrapper{max-width:1200px}}@media (prefers-reduced-motion: reduce){.app-shell .quiz-wrapper .subject-card,.app-shell .quiz-wrapper .option,.app-shell .quiz-wrapper .cancel-btn{transition:none}}