:root{--bg-primary:#050816;--bg-secondary:#0b1023;--card-bg:rgba(17, 24, 39, 0.78);--text-primary:#ffffff;--text-secondary:#b8c1d9;--accent-primary:#6ee7ff;--accent-secondary:#8b5cf6;--accent-success:#22c55e;--accent-danger:#ef4444;--border-color:rgba(255, 255, 255, 0.08);--shadow-primary:0 10px 40px rgba(0, 0, 0, 0.45);--blur:blur(18px);--radius-large:32px;--radius-medium:22px;--radius-small:14px;--transition:220ms cubic-bezier(0.22, 1, 0.36, 1);--max-width:1400px}*,::after,::before{box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth;-webkit-tap-highlight-color:transparent}body{margin:0;padding:0;font-family:Inter,system-ui,sans-serif;background:radial-gradient(circle at top,#111936,#050816 70%);color:var(--text-primary);min-height:100vh;overflow-x:hidden;user-select:none;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}img{max-width:100%;display:block}button,input{font:inherit}button{border:none;cursor:pointer}.hidden{display:none!important}.background-layer{position:fixed;inset:0;overflow:hidden;z-index:-1}.stars{position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.8) 1px,transparent 1px);background-size:80px 80px;opacity:.12}.gradient-orb{position:absolute;border-radius:999px;filter:blur(120px);opacity:.35}.orb-one{width:420px;height:420px;background:#5b9cff;top:-100px;left:-100px;animation:12s ease-in-out infinite floatOrb}.orb-two{width:320px;height:320px;background:#9333ea;bottom:-100px;right:-60px;animation:14s ease-in-out infinite floatOrb}.orb-three{width:260px;height:260px;background:#00d4ff;top:40%;left:55%;animation:16s ease-in-out infinite floatOrb}@keyframes floatOrb{0%,100%{transform:translateY(0) translateX(0)}50%{transform:translateY(-25px) translateX(15px)}}.screen{min-height:100vh;display:none;align-items:center;justify-content:center;padding:env(safe-area-inset-top) 20px env(safe-area-inset-bottom)}.screen.active{display:flex}.splash-container{width:100%;max-width:460px;text-align:center;animation:.9s fadeInUp}.splash-logo{width:140px;margin:0 auto 28px}.splash-title{margin:0;font-size:clamp(2.5rem, 7vw, 4rem);font-weight:800;letter-spacing:-.04em}.splash-subtitle{margin-top:14px;font-size:1.1rem;color:var(--text-secondary)}.loader-ring{width:78px;height:78px;margin:50px auto 0;border-radius:50%;border:5px solid rgba(255,255,255,.08);border-top-color:var(--accent-primary);animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.login-card{width:100%;max-width:460px;background:var(--card-bg);border:1px solid var(--border-color);backdrop-filter:var(--blur);border-radius:var(--radius-large);padding:42px 30px;box-shadow:var(--shadow-primary);animation:.7s fadeInUp}.login-logo{width:96px;margin:0 auto 24px}.login-title{margin:0;text-align:center;font-size:2rem;font-weight:800}.login-description{margin-top:12px;color:var(--text-secondary);text-align:center;line-height:1.7}#login-form{margin-top:34px;display:flex;flex-direction:column;gap:18px}.input-group{position:relative}.input-group input{width:100%;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:18px;color:#fff;outline:0;transition:var(--transition)}.input-group input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 4px rgba(110,231,255,.12)}#login-button{height:62px;border-radius:18px;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));color:#fff;font-size:1rem;font-weight:700;transition:var(--transition)}#login-button:hover{transform:translateY(-2px) scale(1.01)}.login-error{margin-top:18px;text-align:center;color:var(--accent-danger);min-height:24px}#app-shell{width:100%;max-width:var(--max-width);margin:0 auto;padding:env(safe-area-inset-top) 18px 120px}.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 18px;margin-bottom:30px;border:1px solid rgba(255,255,255,.08);border-radius:26px;background:rgba(10,15,30,.72);backdrop-filter:var(--blur)}.topbar-left{display:flex;align-items:center;gap:14px}.topbar-logo{width:54px;height:54px;border-radius:18px}.topbar-title{margin:0;font-size:1.2rem;font-weight:800}.topbar-subtitle{margin-top:4px;color:var(--text-secondary);font-size:.92rem}.xp-card{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.08);padding:12px 18px;border-radius:18px;font-weight:700}.welcome-section{margin-bottom:34px}.welcome-title{margin:0;font-size:clamp(2rem, 5vw, 3.5rem);font-weight:800;line-height:1.1}.welcome-subtitle{margin-top:12px;color:var(--text-secondary);font-size:1.08rem}.categories-grid,.topics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.category-card,.topic-card{position:relative;overflow:hidden;min-height:220px;padding:26px;border-radius:30px;border:1px solid rgba(255,255,255,.08);background:linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.03));backdrop-filter:var(--blur);transition:var(--transition);cursor:pointer}.category-card:hover,.topic-card:hover{transform:translateY(-6px) scale(1.01)}.category-icon{font-size:3rem}.category-title,.topic-title{margin-top:24px;font-size:1.5rem;font-weight:800}.category-description,.topic-description{margin-top:12px;line-height:1.7;color:var(--text-secondary)}.mission-screen{width:100%}.mission-header{margin-bottom:24px}.back-button{background:rgba(255,255,255,.08);color:#fff;padding:14px 18px;border-radius:16px;transition:var(--transition)}.back-button:hover{background:rgba(255,255,255,.12)}.mission-content{display:flex;flex-direction:column;gap:26px}.mission-image-wrapper{position:relative;overflow:hidden;border-radius:34px;min-height:300px;background:linear-gradient(145deg,rgba(255,255,255,.08),rgba(255,255,255,.03));border:1px solid rgba(255,255,255,.08)}.mission-glow{position:absolute;inset:0;background:radial-gradient(circle,rgba(110,231,255,.18),transparent 70%)}.mission-image{width:100%;height:100%;object-fit:cover}.mission-category{display:inline-flex;padding:10px 16px;border-radius:999px;background:rgba(110,231,255,.12);color:var(--accent-primary);font-weight:700}.mission-title{margin:16px 0 0;font-size:clamp(2rem, 5vw, 4rem);font-weight:800;line-height:1.05}.mission-description{margin-top:18px;line-height:1.9;color:var(--text-secondary);font-size:1.05rem}.mission-steps{display:flex;flex-direction:column;gap:18px}.step-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:22px;padding:24px;transition:var(--transition)}.step-card:hover{transform:translateX(6px)}.step-number{display:inline-flex;width:42px;height:42px;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));font-weight:800}.step-text{margin-top:18px;line-height:1.8}.quiz-container{margin-top:18px}.quiz-question{font-size:clamp(1.6rem, 4vw, 2.6rem);line-height:1.3}.quiz-options{margin-top:24px;display:grid;gap:18px}.quiz-option{width:100%;text-align:left;padding:22px;border-radius:22px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);color:#fff;transition:var(--transition)}.quiz-option:hover{transform:translateY(-2px)}.quiz-option.correct{background:rgba(34,197,94,.18);border-color:rgba(34,197,94,.5)}.quiz-option.wrong{background:rgba(239,68,68,.15);border-color:rgba(239,68,68,.4)}.explanation-container{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:30px;padding:28px}.explanation-title{margin:0;font-size:1.8rem;font-weight:800}.explanation-text{margin-top:18px;color:var(--text-secondary);line-height:1.9}.install-button{position:fixed;bottom:calc(env(safe-area-inset-bottom) + 22px);right:22px;z-index:60;padding:16px 22px;border-radius:18px;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));color:#fff;font-weight:700;box-shadow:0 12px 34px rgba(0,0,0,.35)}.toast{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom) + 26px);transform:translateX(-50%) translateY(120px);background:rgba(12,18,35,.94);border:1px solid rgba(255,255,255,.08);padding:16px 22px;border-radius:18px;backdrop-filter:var(--blur);transition:var(--transition);z-index:100}.toast.show{transform:translateX(-50%) translateY(0)}@keyframes fadeInUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@media (max-width:768px){.topbar{padding:14px}.categories-grid,.topics-grid{grid-template-columns:1fr}.mission-title,.welcome-title{font-size:2.3rem}.login-card{padding:30px 22px}#app-shell{padding:env(safe-area-inset-top) 14px 120px}}@media (max-width:480px){.topbar-logo{width:46px;height:46px}.topbar-title{font-size:1rem}.mission-image-wrapper{min-height:240px}.category-card,.topic-card{min-height:190px}.quiz-option{padding:18px}}