@import "https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=Nunito:wght@400;500;600;700;800&display=swap";:root{--coral:#ff6b6b;--violet:#7c5cbf;--violet-light:#a78bfa;--mint:#34d399;--yellow:#fbbf24;--sky:#38bdf8;--pink:#f472b6;--bg:#f8f7ff;--card:#fff;--text:#1a1033;--text-muted:#7b7497;--border:#ede9fe;--nav-h:72px;--radius:20px;--radius-sm:12px;--shadow:0 4px 24px #7c5cbf1a;--shadow-md:0 8px 32px #7c5cbf29}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{background:var(--bg);height:100%;color:var(--text);-webkit-font-smoothing:antialiased;font-family:Nunito,sans-serif}body{overflow-x:hidden}h1,h2,h3,h4{font-family:Syne,sans-serif}.page{min-height:100vh;padding-bottom:calc(var(--nav-h) + 16px);max-width:480px;margin:0 auto;padding-top:0}.page-header{justify-content:space-between;align-items:center;gap:12px;padding:24px 20px 12px;display:flex}.page-title{color:var(--text);font-size:1.6rem;font-weight:800}.page-content{padding:0 16px}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1.5px solid var(--border);padding:20px}.card+.card{margin-top:12px}.btn{cursor:pointer;border:none;border-radius:50px;justify-content:center;align-items:center;gap:8px;padding:14px 24px;font-family:Nunito,sans-serif;font-size:1rem;font-weight:700;text-decoration:none;transition:transform .15s,box-shadow .15s;display:inline-flex}.btn:active{transform:scale(.97)}.btn-primary{background:var(--violet);color:#fff;width:100%;box-shadow:0 4px 16px #7c5cbf59}.btn-primary:hover{box-shadow:0 6px 20px #7c5cbf73}.btn-secondary{background:var(--border);color:var(--violet)}.btn-coral{background:var(--coral);color:#fff;box-shadow:0 4px 16px #ff6b6b59}.btn-mint{background:var(--mint);color:#fff;box-shadow:0 4px 16px #34d39959}.btn-sm{padding:8px 16px;font-size:.85rem}.btn-icon{background:var(--border);width:42px;height:42px;color:var(--violet);border-radius:50%;padding:0}.input-group{margin-bottom:20px}.input-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px;font-size:.85rem;font-weight:700;display:block}.input{border-radius:var(--radius-sm);border:2px solid var(--border);background:var(--bg);width:100%;color:var(--text);outline:none;padding:16px 18px;font-family:Nunito,sans-serif;font-size:1rem;transition:border-color .2s}.input:focus{border-color:var(--violet-light);background:#fff}textarea.input{resize:vertical;min-height:120px}.bottom-nav{width:100%;max-width:480px;height:var(--nav-h);border-top:1.5px solid var(--border);z-index:100;padding-bottom:env(safe-area-inset-bottom);background:#fff;justify-content:space-around;align-items:center;display:flex;position:fixed;bottom:0;left:50%;transform:translate(-50%)}.nav-item{cursor:pointer;border-radius:var(--radius-sm);color:var(--text-muted);flex-direction:column;align-items:center;gap:3px;padding:8px 16px;font-size:.7rem;font-weight:700;text-decoration:none;transition:background .15s;display:flex}.nav-item.active{color:var(--violet)}.nav-item.active .nav-icon-wrap{background:var(--border);transform:translateY(-4px)}.nav-icon-wrap{border-radius:50px;justify-content:center;align-items:center;width:44px;height:32px;transition:all .2s;display:flex}.subject-chip{opacity:.92;border-radius:50px;align-items:center;gap:5px;padding:4px 12px;font-size:.78rem;font-weight:700;display:inline-flex}.tag{background:var(--border);color:var(--violet);border-radius:50px;padding:3px 10px;font-size:.75rem;font-weight:700;display:inline-block}.hero-banner{border-radius:var(--radius);color:#fff;margin:0 16px 20px;padding:24px 20px;position:relative;overflow:hidden}.hero-banner:after{content:"";background:url("data:image/svg+xml,%3Csvg width='200' height='200' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='160' cy='40' r='80' fill='rgba(255,255,255,0.08)'/%3E%3Ccircle cx='20' cy='150' r='60' fill='rgba(255,255,255,0.06)'/%3E%3C/svg%3E") 100% 0 no-repeat;position:absolute;inset:0}.stats-row{grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px;display:grid}.stat-card{background:var(--card);border-radius:var(--radius-sm);text-align:center;border:1.5px solid var(--border);box-shadow:var(--shadow);padding:16px 12px}.stat-num{font-family:Syne,sans-serif;font-size:1.6rem;font-weight:800;line-height:1}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;margin-top:4px;font-size:.72rem;font-weight:700}.section-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;margin:20px 0 10px;font-family:Syne,sans-serif;font-size:1rem;font-weight:700}.empty-state{text-align:center;color:var(--text-muted);padding:48px 24px}.empty-emoji{margin-bottom:12px;font-size:3rem}.empty-title{color:var(--text);margin-bottom:6px;font-size:1.1rem;font-weight:700}.empty-sub{margin-bottom:20px;font-size:.9rem}.modal-overlay{z-index:200;background:#1a103380;justify-content:center;align-items:flex-end;display:flex;position:fixed;inset:0}.modal{background:#fff;border-radius:28px 28px 0 0;width:100%;max-width:480px;max-height:90vh;padding:28px 24px 52px;animation:.25s slideUp;overflow:visible auto}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}.modal-handle{background:var(--border);border-radius:4px;width:40px;height:4px;margin:0 auto 20px}.modal-title{margin-bottom:20px;font-size:1.3rem;font-weight:800}.auth-page{background:linear-gradient(145deg,#ede9fe 0%,#f8f7ff 50%,#fce7f3 100%);flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:24px 20px;display:flex}.auth-logo{color:var(--violet);margin-bottom:8px;font-family:Syne,sans-serif;font-size:2.4rem;font-weight:800}.auth-logo span{color:var(--coral)}.auth-subtitle{color:var(--text-muted);text-align:center;margin-bottom:32px;font-size:.95rem;font-weight:600}.auth-card{width:100%;max-width:420px;box-shadow:var(--shadow-md);border:1.5px solid var(--border);background:#fff;border-radius:28px;padding:28px 24px}.quiz-progress{background:var(--border);border-radius:6px;height:6px;margin:0 16px 24px;overflow:hidden}.quiz-progress-fill{background:linear-gradient(90deg, var(--violet), var(--violet-light));border-radius:6px;height:100%;transition:width .4s}.option-btn{border-radius:var(--radius-sm);border:2.5px solid var(--border);cursor:pointer;text-align:left;width:100%;color:var(--text);background:#fff;margin-bottom:10px;padding:16px 20px;font-family:Nunito,sans-serif;font-size:.95rem;font-weight:600;transition:all .18s}.option-btn:hover{border-color:var(--violet-light);background:var(--bg)}.option-btn.correct{border-color:var(--mint);color:#065f46;background:#d1fae5}.option-btn.wrong{border-color:var(--coral);color:#991b1b;background:#fee2e2}.flashcard-wrap{perspective:1000px;cursor:pointer;height:240px;margin:20px 16px}.flashcard-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1);position:relative}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-face{border-radius:var(--radius);backface-visibility:hidden;box-shadow:var(--shadow-md);justify-content:center;align-items:center;padding:28px;display:flex;position:absolute;inset:0}.flashcard-front{background:linear-gradient(135deg, var(--violet) 0%, var(--violet-light) 100%);color:#fff}.flashcard-back{background:linear-gradient(135deg, var(--coral) 0%, #ff9a9a 100%);color:#fff;transform:rotateY(180deg)}.flashcard-text{text-align:center;font-family:Syne,sans-serif;font-size:1.2rem;font-weight:700;line-height:1.4}.loading{height:100vh;color:var(--violet);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.spinner{border:3px solid var(--border);border-top-color:var(--violet);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.fade-in{animation:.3s fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media (width>=768px){.page,.bottom-nav{max-width:768px}.page-content{padding:0 32px}.page-header{padding:32px 32px 16px}.page-title{font-size:2rem}.auth-page{padding:40px}.auth-card{max-width:480px;padding:40px}.stats-row{grid-template-columns:repeat(3,1fr);gap:16px}.card{padding:24px 28px}.modal{border-radius:24px;max-width:560px;margin:auto}.modal-overlay{align-items:center;padding:20px}.flashcard-wrap{height:300px}.flashcard-text{font-size:1.5rem}}@media (width>=1024px){html,body{background:#ede9fe}#root{justify-content:center;display:flex}.page{background:var(--bg);min-height:100vh;box-shadow:0 0 80px #7c5cbf26}.bottom-nav{left:50%;transform:translate(-50%)}}@media (hover:none){.btn:hover{box-shadow:none}.option-btn:hover{border-color:var(--border);background:#fff}}@supports (padding-bottom:env(safe-area-inset-bottom)){.bottom-nav{padding-bottom:env(safe-area-inset-bottom);height:calc(var(--nav-h) + env(safe-area-inset-bottom))}.page{padding-bottom:calc(var(--nav-h) + env(safe-area-inset-bottom) + 16px)}}