@import "https://fonts.googleapis.com/css2?family=Onest:wght@300;400;500;600;700;800&family=Outfit:wght@300;400;500;600;700;800&display=swap";:root{--font-sans:"Onest", "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--bg-primary:#f8fafc;--bg-secondary:#fff;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--primary:#1761ff;--primary-hover:#1451dd;--primary-gradient:linear-gradient(135deg, #1761ff 0%, #1042b3 100%);--primary-glow:#1761ff40;--success:#10b981;--success-bg:#ecfdf5;--success-text:#047857;--error:#f43f5e;--error-bg:#fff1f2;--error-text:#be123c;--warning:#f59e0b;--warning-bg:#fef3c7;--warning-text:#b45309;--border-color:#e2e8f0;--border-focus:#cbd5e1;--card-bg:#ffffffd9;--card-border:#e2e8f0cc;--card-shadow:0 10px 30px -10px #0000000a, 0 1px 3px #00000005;--accent-purple:#8b5cf6;--accent-purple-bg:#f5f3ff;--accent-orange:#f97316;--accent-orange-bg:#fff7ed;--accent-pink:#db2777;--accent-pink-bg:#fdf2f8;--header-height:4.25rem;--bottom-nav-height:4.5rem;--sidebar-width:260px}[data-theme=dark]{--bg-primary:#090d16;--bg-secondary:#0f172a;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--border-color:#1e293b;--border-focus:#334155;--card-bg:#0f172ab3;--card-border:#33415580;--card-shadow:0 15px 35px -15px #0000004d, 0 1px 4px #0000001a;--success-bg:#10b9811a;--success-text:#34d399;--error-bg:#f43f5e1a;--error-text:#fb7185;--warning-bg:#f59e0b1a;--warning-text:#fbbf24;--accent-purple-bg:#8b5cf61a;--accent-orange-bg:#f973161a;--accent-pink-bg:#db27771a}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);-webkit-user-select:none;user-select:none;min-height:100vh;line-height:1.5;transition:background-color .3s,color .3s;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.blur-glow-container{z-index:-1;pointer-events:none;width:100%;height:100%;position:fixed;inset:0;overflow:hidden}.blur-glow-1{filter:blur(100px);background:radial-gradient(circle,#1761ff1f 0%,#6366f10f 50%,#0000 100%);border-radius:50%;width:60vw;height:60vw;position:absolute;top:-10%;left:-10%}.blur-glow-2{filter:blur(100px);background:radial-gradient(circle,#8b5cf61a 0%,#db27770d 50%,#0000 100%);border-radius:50%;width:50vw;height:50vw;position:absolute;bottom:-10%;right:-10%}[data-theme=dark] .blur-glow-1{background:radial-gradient(circle,#1761ff2e 0%,#6366f114 50%,#0000 100%)}[data-theme=dark] .blur-glow-2{background:radial-gradient(circle,#8b5cf626 0%,#db27770f 50%,#0000 100%)}.glass-card{background:var(--card-bg);border:1px solid var(--card-border);box-shadow:var(--card-shadow);-webkit-backdrop-filter:blur(12px)saturate(180%);border-radius:20px;padding:1.5rem;transition:transform .2s,border-color .2s,box-shadow .2s}.glass-card:hover{border-color:var(--border-focus)}.btn{font-family:var(--font-sans);cursor:pointer;border:1px solid #0000;border-radius:9999px;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.75rem;font-size:.95rem;font-weight:600;text-decoration:none;transition:all .25s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:0 10px 20px -5px var(--primary-glow)}.btn-primary:hover{box-shadow:0 15px 25px -5px var(--primary-glow);filter:brightness(1.05);transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--bg-secondary);color:var(--text-primary);border-color:var(--border-color)}.btn-secondary:hover{background:var(--bg-primary);border-color:var(--border-focus);transform:translateY(-1px)}.btn-ghost{color:var(--text-secondary);background:0 0;padding:.5rem 1rem}.btn-ghost:hover{background:var(--border-color);color:var(--text-primary)}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none!important;transform:none!important}.app-container{min-height:100vh;display:flex}.main-content{padding:2rem;padding-top:calc(var(--header-height) + 1.5rem);flex:1;transition:padding .3s}.app-header{height:var(--header-height);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);z-index:40;background:#fffc;justify-content:space-between;align-items:center;padding:0 2rem;transition:background-color .3s,border-color .3s;display:flex;position:fixed;top:0;left:0;right:0}[data-theme=dark] .app-header{background:#0f172acc}.logo-container{color:var(--text-primary);align-items:center;gap:.75rem;font-size:1.35rem;font-weight:800;text-decoration:none;display:flex}.logo-badge{background:var(--primary-gradient);color:#fff;border-radius:10px;justify-content:center;align-items:center;width:2.25rem;height:2.25rem;font-size:1.1rem;font-weight:800;display:flex}.desktop-nav{display:none}.header-nav-item{color:var(--text-secondary);cursor:pointer;border-radius:12px;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.9rem;font-weight:600;text-decoration:none;transition:all .2s;display:flex}.header-nav-item:hover{background:var(--bg-primary);color:var(--text-primary)}.header-nav-item.active{color:var(--primary);background:#1761ff14}[data-theme=dark] .header-nav-item.active{color:#3b82f6;background:#1761ff26}.bottom-nav{height:var(--bottom-nav-height);-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--border-color);z-index:40;background:#ffffffd9;grid-template-columns:repeat(5,1fr);padding:.5rem;transition:background-color .3s,border-color .3s;display:none;position:fixed;bottom:0;left:0;right:0}[data-theme=dark] .bottom-nav{background:#0f172ad9}.bottom-nav-item{color:var(--text-secondary);cursor:pointer;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:.25rem;font-size:.68rem;font-weight:500;transition:all .2s;display:flex}.bottom-nav-item.active{color:var(--primary);font-weight:700}@keyframes shake{0%,to{transform:translate(0)}20%,60%{transform:translate(-6px)}40%,80%{transform:translate(6px)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:.3s cubic-bezier(.4,0,.2,1) forwards fadeIn}.shake{animation:.4s ease-in-out shake}@keyframes pulse-glow{0%,to{box-shadow:0 0 #1761ff66}50%{box-shadow:0 0 15px 4px #1761ff33}}.pulse-glow{animation:2s infinite pulse-glow}.grid-2{grid-template-columns:repeat(2,1fr);gap:1.5rem;display:grid}.grid-3{grid-template-columns:repeat(3,1fr);gap:1.5rem;display:grid}.option-btn{width:100%}.option-btn:hover:not(:disabled){transform:translateY(-1px);border-color:var(--primary)!important;background:#1761ff05!important}.install-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;background:#0006;justify-content:center;align-items:center;padding:1.5rem;display:flex;position:fixed;inset:0}.install-dialog{color:#fff;background:#111d1d;border:1px solid #ffffff0d;border-radius:24px;width:100%;max-width:440px;padding:1.75rem;box-shadow:0 20px 40px #0006,inset 0 0 1px 1px #ffffff1a}.install-title{color:#fff;margin-bottom:1.25rem;font-size:1.15rem;font-weight:600}.install-app-info{align-items:center;gap:1rem;margin-bottom:2rem;display:flex}.install-app-icon{background:linear-gradient(135deg,#1761ff 0%,#1042b3 100%);border-radius:14px;justify-content:center;align-items:center;width:3.5rem;height:3.5rem;display:flex;box-shadow:0 4px 12px #1761ff4d}.install-app-icon svg{color:#fff;width:2rem;height:2rem}.install-app-details h4{color:#fff;margin-bottom:.15rem;font-size:1rem;font-weight:600}.install-app-details p{color:#a3b8b8;font-size:.85rem}.install-actions{justify-content:flex-end;gap:.75rem;display:flex}.btn-install-confirm{color:#fff;cursor:pointer;background:#005052;border:none;border-radius:9999px;padding:.7rem 1.5rem;font-size:.9rem;font-weight:600;transition:background-color .2s}.btn-install-confirm:hover{background:#00686b}.btn-install-cancel{color:#8ee;cursor:pointer;background:0 0;border:2px solid #8ee;border-radius:9999px;padding:.7rem 1.5rem;font-size:.9rem;font-weight:600;transition:all .2s;box-shadow:0 0 10px #88eeee26}.btn-install-cancel:hover{background:#88eeee1a;box-shadow:0 0 15px #88eeee40}@media (width<=1024px){.app-header{padding:0 1rem;left:0}.main-content{padding:1rem;padding-top:calc(var(--header-height) + 1rem);padding-bottom:calc(var(--bottom-nav-height) + 1.5rem)}.bottom-nav{display:grid}.grid-3,.grid-2{grid-template-columns:1fr;gap:1rem}.desktop-nav{display:none!important}}@media (width>=1025px){.desktop-nav{display:flex;position:absolute;left:50%;transform:translate(-50%)}.main-content{width:100%;max-width:850px;padding:2rem 1.5rem;padding-top:calc(var(--header-height) + 2rem);margin:0 auto}}.practice-header-container{justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1.5rem;display:flex}.practice-header-left{align-items:center;gap:.75rem;display:flex}.practice-header-right{gap:.5rem;display:flex}.practice-mode-badge{background:var(--accent-purple-bg);color:var(--accent-purple);white-space:nowrap;border:1px solid #8b5cf626;border-radius:9999px;padding:.4rem .8rem;font-size:.8rem;font-weight:700}.practice-question-counter{color:var(--text-secondary);font-size:.9rem;font-weight:600}@media (width<=640px){.practice-header-container{flex-direction:column;align-items:stretch;gap:.75rem}.practice-header-left{justify-content:space-between;width:100%}.practice-header-right{grid-template-columns:1fr 1fr;width:100%;display:grid}.practice-header-right button{justify-content:center;width:100%;padding:.6rem!important}}.quiz-header-container{justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1.5rem;display:flex}.quiz-header-left{align-items:center;gap:.75rem;display:flex}.quiz-mode-badge{color:var(--primary);white-space:nowrap;background:#1761ff0d;border:1px solid #1761ff26;border-radius:9999px;padding:.4rem .8rem;font-size:.8rem;font-weight:700}@media (width<=640px){.quiz-header-container{flex-direction:row;justify-content:space-between;width:100%}.quiz-header-left{flex-direction:column;align-items:flex-start;gap:.25rem}}