@import "https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700&display=swap";:root{--bg-color:#f4f7fe;--text-color:#2b3674;--card-bg:#fff;--card-shadow:0 10px 30px #0000000d;--primary:#4318ff;--primary-hover:#3111bd;--secondary-text:#a3aed0;--correct:#05cd99;--incorrect:#ee5d50;--border-radius:16px;--transition:all .3s ease}body.dark-mode{--bg-color:#0b1437;--text-color:#fff;--card-bg:#111c44;--card-shadow:0 10px 30px #0000004d;--primary:#7551ff;--primary-hover:#613fff;--secondary-text:#a3aed0;--correct:#01b574;--incorrect:#e34335}*{box-sizing:border-box;scrollbar-width:thin;scrollbar-color:var(--secondary-text) transparent;margin:0;padding:0;font-family:Outfit,sans-serif}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background-color:var(--secondary-text);border-radius:10px;transition:background-color .3s}::-webkit-scrollbar-thumb:hover{background-color:var(--primary)}body{background-color:var(--bg-color);color:var(--text-color);transition:var(--transition);min-height:100vh;overflow-x:hidden}.app-container{max-width:1200px;margin:0 auto;padding:2rem}.app-header{justify-content:space-between;align-items:center;margin-bottom:3rem;display:flex}.app-header h1{background:linear-gradient(135deg, var(--primary) 0%, #39b8ff 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:2rem;font-weight:700}.theme-toggle{background:var(--card-bg);color:var(--text-color);cursor:pointer;box-shadow:var(--card-shadow);transition:var(--transition);border:none;border-radius:30px;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;display:flex}.theme-toggle:hover{transform:translateY(-2px);box-shadow:0 12px 35px #0000001a}.fade-in{animation:.5s forwards fadeIn}.slide-in{animation:.3s forwards slideIn}.slide-out{animation:.3s forwards slideOut}.zoom-in{animation:.5s 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p{color:var(--secondary-text);font-size:.95rem}.card-overlay{opacity:0;width:100%;height:100%;transition:var(--transition);background:#4318ffe6;justify-content:center;align-items:center;display:flex;position:absolute;top:0;left:0}.unit-card:hover .card-overlay{opacity:1}.card-overlay button{color:#4318ff;cursor:pointer;background:#fff;border:none;border-radius:30px;padding:.75rem 2rem;font-size:1rem;font-weight:700;transition:all .4s cubic-bezier(.175,.885,.32,1.275);transform:translateY(20px)}.unit-card:hover .card-overlay button{transform:translateY(0)}.quiz-container{background:var(--card-bg);border-radius:var(--border-radius);box-shadow:var(--card-shadow);max-width:800px;margin:0 auto;padding:3rem}.quiz-header{justify-content:space-between;align-items:center;margin-bottom:1.5rem;display:flex}.header-actions{align-items:center;gap:1rem;display:flex}.back-btn{color:var(--secondary-text);cursor:pointer;transition:var(--transition);background:0 0;border:none;font-size:1rem;font-weight:600}.back-btn:hover{color:var(--primary)}.reset-btn{color:var(--incorrect);cursor:pointer;transition:var(--transition);background:#ee5d501a;border:none;border-radius:20px;padding:.4rem .8rem;font-size:.85rem;font-weight:600}.reset-btn:hover{background:var(--incorrect);color:#fff}.question-tracker{color:var(--primary);background:#4318ff1a;border-radius:20px;padding:.5rem 1rem;font-size:.9rem;font-weight:700}.tracker-group{align-items:center;gap:1rem;display:flex}.stats-tracker{background:var(--bg-color);border:1px solid #a3aed033;border-radius:20px;gap:.8rem;padding:.5rem 1rem;font-size:.9rem;font-weight:700;display:flex}.stat-correct{color:var(--correct)}.stat-wrong{color:var(--incorrect)}.progress-bar-bg{background:var(--bg-color);border-radius:4px;width:100%;height:8px;margin-bottom:2rem;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--primary) 0%, #39b8ff 100%);border-radius:4px;height:100%;transition:width .4s}.question-box{margin-bottom:2.5rem}.question-box h3{font-size:1.4rem;font-weight:600;line-height:1.5}.options-grid{flex-direction:column;gap:1rem;display:flex}.option-btn{background:var(--bg-color);text-align:left;color:var(--text-color);cursor:pointer;transition:var(--transition);border:2px solid #0000;border-radius:12px;padding:1.25rem 1.5rem;font-size:1rem;font-weight:500;position:relative;overflow:hidden}.option-btn:hover:not(:disabled){border-color:var(--primary);background:#4318ff0d;transform:translate(5px)}.option-btn.correct{border-color:var(--correct);color:var(--correct);background:#05cd991a}.option-btn.incorrect{border-color:var(--incorrect);color:var(--incorrect);background:#ee5d501a}.option-btn.selected{border-color:var(--primary);background:#4318ff1a;transform:translate(5px)}.option-btn:disabled{cursor:default}.option-btn:disabled:not(.selected):not(.correct):not(.incorrect){opacity:.7}.explanation-box{border-radius:12px;margin-top:1.5rem;padding:1.5rem;font-size:1rem;line-height:1.5}.explanation-box.success{border:1px solid var(--correct);color:var(--text-color);background:#05cd991a}.explanation-box.error{border:1px solid var(--incorrect);color:var(--text-color);background:#ee5d501a}.explanation-box h4{margin-bottom:.5rem;font-size:1.2rem}.explanation-box.success h4{color:var(--correct)}.explanation-box.error h4{color:var(--incorrect)}.correct-answer-text{color:var(--text-color);margin-bottom:.5rem;font-size:1.05rem}.explanation-text{color:var(--secondary-text);margin-top:.5rem}.quiz-navigation{border-top:1px solid #a3aed033;justify-content:space-between;margin-top:2.5rem;padding-top:1.5rem;display:flex}.nav-btn,.submit-btn,.next-btn{cursor:pointer;transition:var(--transition);border:none;border-radius:8px;padding:.8rem 1.5rem;font-size:1rem;font-weight:600}.nav-btn{color:var(--secondary-text);background:0 0}.nav-btn:hover:not(:disabled){color:var(--primary);background:#4318ff0d}.nav-btn:disabled{opacity:.5;cursor:not-allowed}.submit-btn{background:var(--primary);color:#fff;margin-left:auto}.submit-btn:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-2px)}.submit-btn:disabled{background:var(--secondary-text);cursor:not-allowed}.next-btn{background:var(--correct);color:#fff;margin-left:auto}.next-btn:hover{background:#04b083;transform:translateY(-2px)}.results-screen{text-align:center;background:var(--card-bg);border-radius:var(--border-radius);box-shadow:var(--card-shadow);max-width:600px;margin:0 auto;padding:4rem 2rem}.results-screen h2{margin-bottom:2rem;font-size:2.5rem}.score-display{background:linear-gradient(135deg, var(--primary) 0%, #39b8ff 100%);color:#fff;border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:200px;height:200px;margin:0 auto 2.5rem;display:flex;box-shadow:0 15px 35px #4318ff4d}.score-display p{opacity:.9;margin-bottom:.5rem;font-size:1.1rem}.score-display h3{font-size:3rem;font-weight:700}.primary-btn{background:var(--primary);color:#fff;cursor:pointer;transition:var(--transition);border:none;border-radius:30px;padding:1rem 2.5rem;font-size:1.1rem;font-weight:600}.primary-btn:hover{background:var(--primary-hover);transform:translateY(-3px);box-shadow:0 10px 25px #4318ff4d}.loader{text-align:center;color:var(--secondary-text);padding:4rem;font-size:1.5rem}.results-screen{max-width:800px}.analytics-section{text-align:left;border-radius:var(--border-radius);background:#a3aed00d;border:1px solid #a3aed033;margin-bottom:2rem;padding:2rem}.analytics-section h3{text-align:center;margin-bottom:1.5rem;font-size:1.5rem}.analytics-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:2rem;display:grid}.analytics-card{background:var(--card-bg);border-radius:12px;padding:1.5rem;box-shadow:0 5px 15px #00000008}.analytics-card h4{color:var(--secondary-text);margin-bottom:.8rem;font-size:1rem}.mini-progress-bg{background:var(--bg-color);border-radius:3px;width:100%;height:6px;margin-bottom:.5rem;overflow:hidden}.mini-progress-fill{border-radius:3px;height:100%;transition:width .4s}.mini-progress-fill.good{background:var(--correct)}.mini-progress-fill.bad{background:var(--incorrect)}.analytics-card p{text-align:right;font-size:.9rem;font-weight:600}.improvement-box{border-left:4px solid var(--incorrect);background:#ee5d501a;border-radius:8px;padding:1.5rem}.improvement-box.success{border-left:4px solid var(--correct);background:#05cd991a}.improvement-box h4{margin-bottom:.8rem;font-size:1.1rem}.improvement-box ul{padding-left:1.5rem}.improvement-box li{margin-bottom:.5rem;line-height:1.4}.mt-4{margin-top:1rem}@keyframes fadeOut{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-20px)}}.fade-out{animation:.3s forwards fadeOut}@media (width<=768px){.quiz-container{padding:1.5rem}.app-header h1{font-size:1.5rem}.theme-toggle{padding:.5rem 1rem;font-size:.9rem}.score-display{width:160px;height:160px}.score-display h3{font-size:2.5rem}.quiz-navigation{flex-direction:column;gap:1rem}.submit-btn,.next-btn{width:100%;margin-left:0}.quiz-header{flex-direction:column;align-items:flex-start;gap:1rem}.tracker-group{flex-wrap:wrap;justify-content:space-between;width:100%}}@media (width<=480px){.quiz-header{flex-direction:column;align-items:flex-start;gap:1rem}.header-actions,.tracker-group{justify-content:space-between;width:100%}}.subject-selection{max-width:900px;margin:0 auto}.hero-section{text-align:center;margin-bottom:3rem}.hero-section h2{margin-bottom:.5rem;font-size:2.5rem;font-weight:700}.hero-section p{color:var(--secondary-text);font-size:1.1rem}.subjects-grid{grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2rem;display:grid}.subject-card{background:var(--card-bg);border-radius:var(--border-radius);box-shadow:var(--card-shadow);cursor:pointer;transition:var(--transition);text-align:center;border:1px solid #0000;flex-direction:column;align-items:center;padding:2.5rem;display:flex;position:relative;overflow:hidden}.subject-card:hover{border-color:var(--primary);transform:translateY(-10px);box-shadow:0 20px 40px #4318ff26}.subject-icon{width:70px;height:70px;color:var(--primary);transition:var(--transition);background:#4318ff1a;border-radius:20px;justify-content:center;align-items:center;margin-bottom:1.5rem;font-size:2rem;display:flex}.subject-card:hover .subject-icon{background:var(--primary);color:#fff;transform:rotate(10deg)}.subject-info h3{margin-bottom:.25rem;font-size:1.8rem}.full-name{color:var(--primary);text-transform:uppercase;letter-spacing:1px;margin-bottom:1rem;font-size:.9rem;font-weight:600}.description{color:var(--secondary-text);font-size:1rem;line-height:1.5}@media (width<=768px){.subjects-grid{grid-template-columns:1fr}.hero-section h2{font-size:2rem}}.selection-header{flex-direction:column;align-items:center;margin-bottom:2rem;display:flex}.back-link{color:var(--primary);transition:var(--transition);margin-bottom:1rem;font-weight:600;text-decoration:none}.back-link:hover{transform:translate(-5px)}