:root{--neon-cyan: #00f0ff;--neon-yellow: #ffd600;--text-primary: rgba(255, 255, 255, .9);--text-secondary: rgba(255, 255, 255, .7);--text-dim: rgba(255, 255, 255, .5);--text-muted: rgba(255, 255, 255, .3);--font-heading: "Inter", system-ui, -apple-system, sans-serif;--font-body: "Inter", system-ui, -apple-system, sans-serif;--bg-hero: radial-gradient(ellipse at 50% 30%, rgba(0, 20, 40, .95), rgba(0, 0, 0, .98));--bg-how-it-works: linear-gradient(180deg, rgba(0, 0, 0, .95) 0%, rgba(0, 15, 25, .95) 50%, rgba(0, 0, 0, .95) 100%);--bg-footer: linear-gradient(180deg, rgba(0, 0, 0, .95) 0%, rgba(0, 5, 15, .98) 100%)}.welcome-container{height:100vh;overflow-y:auto;overflow-x:hidden;background:var(--bg-hero);scroll-behavior:smooth}.hero-section{position:relative;min-height:100vh;display:flex;justify-content:center;align-items:center;text-align:center;overflow:hidden;background:transparent;padding-bottom:0}.hero-section:after{content:"";position:absolute;bottom:0;left:50%;transform:translate(-50%);width:80%;height:1px;background:linear-gradient(90deg,transparent 0%,rgba(0,240,255,.15) 20%,rgba(0,240,255,.4) 50%,rgba(0,240,255,.15) 80%,transparent 100%)}.particle-canvas{position:absolute;inset:0;opacity:.6;pointer-events:none}.hero-content{position:relative;z-index:10}.level-display{position:absolute;top:-80px;right:-120px;background:#0006;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:12px 20px;border-radius:12px;border:1px solid var(--neon-cyan);display:flex;flex-direction:column;align-items:flex-start;gap:8px}.level-label{color:var(--neon-cyan);font-size:.8rem;font-weight:800;letter-spacing:1px}.level-progress-bar{width:120px;height:6px;background:#ffffff1a;border-radius:3px;overflow:hidden}.level-progress-fill{height:100%;background:var(--neon-cyan);transition:width .3s ease;border-radius:3px}.level-xp{color:var(--text-dim);font-size:.6rem}.badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:20px;border:1px solid rgba(0,240,255,.2);background:#00f0ff0d;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);margin-bottom:24px}.badge span{font-size:.65rem;letter-spacing:2px;color:var(--neon-cyan);font-weight:700}.main-title{font-family:var(--font-heading);font-size:clamp(3.5rem,14vw,7rem);font-weight:900;letter-spacing:14px;color:var(--neon-cyan);text-shadow:0 0 20px rgba(0,240,255,.8),0 0 40px rgba(0,240,255,.6),0 0 60px rgba(0,240,255,.4),0 0 80px rgba(0,240,255,.2);margin:20px 0;font-style:normal;text-transform:uppercase;line-height:1.1}.subtitle{color:var(--text-secondary);font-size:1rem;letter-spacing:3px;font-weight:300;margin-bottom:48px}.button-group{display:flex;flex-direction:column;align-items:center;gap:16px}.btn-primary{display:inline-flex;align-items:center;gap:12px;background:transparent;border:2px solid var(--neon-cyan);border-radius:14px;color:var(--neon-cyan);cursor:pointer;padding:16px 40px;font-size:.85rem;letter-spacing:3px;font-weight:800;transition:all .3s ease;text-transform:uppercase;position:relative;overflow:hidden}.btn-primary:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(0,240,255,.2),transparent);transition:left .5s ease}.btn-primary:hover{background:#00f0ff1a;box-shadow:0 0 20px #00f0ff66,0 0 40px #00f0ff33,inset 0 0 20px #00f0ff1a;transform:translateY(-2px)}.btn-primary:hover:before{left:100%}.btn-primary:active{transform:translateY(0)}.btn-secondary{display:inline-flex;align-items:center;gap:8px;border-radius:14px;cursor:pointer;padding:12px 28px;font-size:.75rem;letter-spacing:2px;font-weight:700;transition:all .3s ease;text-transform:uppercase;background:transparent}.btn-secondary:hover{transform:translateY(-2px)}.btn-secondary:active{transform:translateY(0)}.btn-cyan{background:#00f0ff1a;border:1.5px solid rgba(0,240,255,.4);color:var(--neon-cyan);box-shadow:0 2px 8px #00f0ff26;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.btn-cyan:hover{background:#00f0ff33;border-color:var(--neon-cyan);box-shadow:0 4px 12px #00f0ff4d}.btn-gold{background:#ffd60014;border:1.5px solid rgba(255,214,0,.35);color:var(--neon-yellow);box-shadow:0 2px 8px #ffd6001a;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.btn-gold:hover{background:#ffd60026;border-color:var(--neon-yellow);box-shadow:0 4px 16px #ffd60040}.how-it-works-section{background:var(--bg-how-it-works);padding:100px 40px 120px;position:relative;z-index:5;border:none;box-shadow:inset 0 50px 50px -50px #00f0ff08,inset 0 -50px 50px -50px #00f0ff08}.how-it-works-section:before{content:"";position:absolute;top:0;left:0;right:0;height:100px;background:linear-gradient(180deg,rgba(0,0,0,.98) 0%,transparent 100%);pointer-events:none;z-index:1}.how-it-works-section:after{content:"";position:absolute;bottom:0;left:0;right:0;height:100px;background:linear-gradient(0deg,rgba(0,0,0,.95) 0%,transparent 100%);pointer-events:none;z-index:1}.section-container{max-width:1200px;margin:0 auto;position:relative;z-index:2}.section-header{text-align:center;margin-bottom:72px}.section-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;border-radius:40px;border:1px solid rgba(0,240,255,.3);background:#00f0ff0d;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);margin-bottom:20px}.section-badge span{font-size:.7rem;letter-spacing:2px;color:var(--neon-cyan);font-weight:600}.section-title{font-size:clamp(2rem,5vw,3rem);font-weight:800;background:linear-gradient(135deg,#00f0ff,#0fc);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:16px;letter-spacing:2px}.section-description{color:var(--text-dim);font-size:1rem;max-width:600px;margin:0 auto;line-height:1.6}.steps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:40px}.step-card{background:#0a141e66;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:24px;padding:32px 24px;text-align:center;border:1px solid rgba(0,240,255,.1);transition:all .3s ease;cursor:default;position:relative;overflow:hidden}.step-card:hover{transform:translateY(-8px);border-color:#00f0ff66;box-shadow:0 20px 40px #0006,0 0 30px #00f0ff1a;background:#0a141e99}.step-watermark{position:absolute;top:20px;right:20px;font-size:3rem;font-weight:900;opacity:.08;line-height:1;transition:opacity .3s ease}.step-card:hover .step-watermark{opacity:.15}.step-icon-wrapper{width:70px;height:70px;margin:0 auto 24px;background:linear-gradient(135deg,#00f0ff1a,#00f0ff05);border-radius:20px;display:flex;align-items:center;justify-content:center;border:1px solid;transition:all .3s ease}.step-card:hover .step-icon-wrapper{transform:scale(1.05);box-shadow:0 0 20px #00f0ff33}.step-title{font-size:1.4rem;font-weight:700;margin-bottom:12px}.step-description{color:#fff9;font-size:.9rem;line-height:1.5}.footer{background:var(--bg-footer);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:60px 20px 30px;position:relative;z-index:5;border:none;box-shadow:inset 0 50px 50px -50px #00f0ff08}.footer:before{content:"";position:absolute;top:0;left:0;right:0;height:100px;background:linear-gradient(180deg,rgba(0,0,0,.95) 0%,transparent 100%);pointer-events:none;z-index:1}.footer-container{max-width:1200px;margin:0 auto;position:relative;z-index:2}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;margin-bottom:50px}.footer-column{display:flex;flex-direction:column}.footer-brand-name{font-size:1.5rem;font-weight:800;background:linear-gradient(135deg,#00f0ff,#0fc);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:16px}.footer-brand-desc{color:#fff6;font-size:.8rem;margin-bottom:20px;line-height:1.5}.footer-badge{display:inline-flex;align-items:center;gap:8px;background:#00f0ff14;padding:6px 14px;border-radius:40px;border:1px solid rgba(0,240,255,.2);width:fit-content;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.footer-badge span{color:var(--neon-cyan);font-size:.65rem;font-weight:600}.footer-column-title{color:var(--neon-cyan);font-size:.8rem;font-weight:700;margin-bottom:20px;letter-spacing:1.5px}.footer-links{list-style:none;padding:0;margin:0}.footer-links li{margin-bottom:12px}.footer-link{color:var(--text-dim);text-decoration:none;font-size:.8rem;transition:all .2s ease;display:inline-flex;align-items:center;gap:8px}.footer-link:hover{color:var(--neon-cyan);transform:translate(5px)}.footer-copyright{padding-top:30px;border-top:1px solid rgba(255,255,255,.05);text-align:center;color:var(--text-muted);font-size:.7rem;letter-spacing:1px}@keyframes glow{0%,to{text-shadow:0 0 20px rgba(0,240,255,.8),0 0 40px rgba(0,240,255,.6),0 0 60px rgba(0,240,255,.4),0 0 80px rgba(0,240,255,.2)}50%{text-shadow:0 0 30px rgba(0,240,255,.9),0 0 50px rgba(0,240,255,.7),0 0 70px rgba(0,240,255,.5),0 0 90px rgba(0,240,255,.3)}}.animate-in{animation:fadeInUp .8s ease-out}.main-title{animation:glow 3s ease-in-out infinite}.dark-mode-toggle{position:fixed;top:20px;right:20px;z-index:1000;background:#0006;border:1px solid rgba(0,240,255,.3);border-radius:50%;width:44px;height:44px;font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all .3s ease;box-shadow:0 2px 12px #0000004d}.dark-mode-toggle:hover{transform:scale(1.1);border-color:var(--neon-cyan);box-shadow:0 0 12px #00f0ff4d}.welcome-container[data-theme=dark]{--text-primary: rgba(255, 255, 255, .9);--text-secondary: rgba(255, 255, 255, .7);--text-dim: rgba(255, 255, 255, .5);--text-muted: rgba(255, 255, 255, .3);--neon-cyan: #00f0ff;--neon-yellow: #ffd600;--bg-hero: radial-gradient(ellipse at 50% 30%, rgba(0, 20, 40, .95), rgba(0, 0, 0, .98));--bg-how-it-works: linear-gradient(180deg, rgba(0, 0, 0, .95) 0%, rgba(0, 15, 25, .95) 50%, rgba(0, 0, 0, .95) 100%);--bg-footer: linear-gradient(180deg, rgba(0, 0, 0, .95) 0%, rgba(0, 5, 15, .98) 100%);--card-bg: rgba(10, 20, 30, .4);--card-border: rgba(0, 240, 255, .1)}.welcome-container[data-theme=dark] .step-card{background:var(--card-bg);border-color:var(--card-border)}.welcome-container[data-theme=dark] .dark-mode-toggle{background:#00000080;border-color:#00f0ff4d}.welcome-container[data-theme=light]{--text-primary: rgba(10, 20, 40, .9);--text-secondary: rgba(10, 20, 40, .7);--text-dim: rgba(10, 20, 40, .55);--text-muted: rgba(10, 20, 40, .35);--neon-cyan: #0066cc;--neon-yellow: #c97a00;--bg-hero: radial-gradient(ellipse at 50% 30%, rgba(220, 235, 255, .98), rgba(240, 248, 255, 1));--bg-how-it-works: linear-gradient(180deg, rgba(240, 248, 255, 1) 0%, rgba(225, 240, 255, 1) 50%, rgba(240, 248, 255, 1) 100%);--bg-footer: linear-gradient(180deg, rgba(240, 248, 255, 1) 0%, rgba(210, 230, 255, 1) 100%);--card-bg: rgba(255, 255, 255, .85);--card-border: rgba(0, 102, 204, .18)}.welcome-container[data-theme=light]{background:var(--bg-hero)}.welcome-container[data-theme=light] .main-title{color:var(--neon-cyan);text-shadow:0 0 20px rgba(0,102,204,.25),0 0 40px rgba(0,102,204,.15);animation:none}.welcome-container[data-theme=light] .subtitle{color:var(--text-secondary)}.welcome-container[data-theme=light] .badge{border-color:#0066cc40;background:#0066cc0f}.welcome-container[data-theme=light] .badge span{color:var(--neon-cyan)}.welcome-container[data-theme=light] .section-description{color:var(--text-dim)}.welcome-container[data-theme=light] .step-card{background:var(--card-bg);border-color:var(--card-border);box-shadow:0 4px 24px #0066cc14}.welcome-container[data-theme=light] .step-description{color:var(--text-dim)}.welcome-container[data-theme=light] .how-it-works-section{background:var(--bg-how-it-works)}.welcome-container[data-theme=light] .how-it-works-section:before{background:linear-gradient(180deg,rgba(240,248,255,1) 0%,transparent 100%)}.welcome-container[data-theme=light] .how-it-works-section:after{background:linear-gradient(0deg,rgba(240,248,255,1) 0%,transparent 100%)}.welcome-container[data-theme=light] .footer{background:var(--bg-footer)}.welcome-container[data-theme=light] .footer:before{background:linear-gradient(180deg,rgba(240,248,255,1) 0%,transparent 100%)}.welcome-container[data-theme=light] .footer-brand-desc{color:var(--text-dim)}.welcome-container[data-theme=light] .footer-copyright{color:var(--text-muted);border-top-color:#0066cc1f}.welcome-container[data-theme=light] .footer-link{color:var(--text-dim)}.welcome-container[data-theme=light] .footer-link:hover{color:var(--neon-cyan)}.welcome-container[data-theme=light] .btn-cyan{background:#0066cc14;border-color:#0066cc59;color:var(--neon-cyan)}.welcome-container[data-theme=light] .btn-cyan:hover{background:#0066cc29;border-color:var(--neon-cyan);box-shadow:0 4px 12px #06c3}.welcome-container[data-theme=light] .btn-primary{border-color:var(--neon-cyan);color:var(--neon-cyan)}.welcome-container[data-theme=light] .btn-primary:hover{background:#0066cc14;box-shadow:0 0 20px #0066cc40,0 0 40px #0066cc1f,inset 0 0 20px #0066cc0f}.welcome-container[data-theme=light] .dark-mode-toggle{background:#ffffffb3;border-color:#0066cc4d}.welcome-container[data-theme=light] .section-badge{border-color:#0066cc40;background:#0066cc0f}.welcome-container[data-theme=light] .section-badge span{color:var(--neon-cyan)}.welcome-container[data-theme=light] .welcome-container::-webkit-scrollbar-track{background:#0066cc0d}.welcome-container[data-theme=light] .welcome-container::-webkit-scrollbar-thumb{background:#06c3}.welcome-container[data-theme=light] .level-display{border-color:var(--neon-cyan);background:#f0f8ff99}.welcome-container[data-theme=light] .level-label{color:var(--neon-cyan)}.welcome-container[data-theme=light] .level-progress-fill{background:var(--neon-cyan)}.welcome-container[data-theme=light] .level-xp{color:var(--text-dim)}.welcome-container[data-theme=light] .footer-badge{border-color:#06c3;background:#0066cc0f}.welcome-container[data-theme=light] .footer-badge span,.welcome-container[data-theme=light] .footer-column-title{color:var(--neon-cyan)}.welcome-container[data-theme=light] .footer-brand-name,.welcome-container[data-theme=light] .section-title{background:linear-gradient(135deg,#06c,#09c);-webkit-background-clip:text;background-clip:text;color:transparent}@media(max-width:768px){.hero-content{padding:0 20px}.level-display{position:relative;top:0;right:0;margin-bottom:20px}.main-title{font-size:clamp(2.5rem,10vw,4rem);letter-spacing:8px}.subtitle{font-size:.8rem;letter-spacing:1.5px}.button-group{width:100%}.btn-primary,.btn-secondary{width:100%;justify-content:center}.steps-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr;gap:30px}.how-it-works-section{padding:70px 24px 80px}}@media(max-width:480px){.footer-grid{grid-template-columns:1fr}.how-it-works-section{padding:50px 16px 60px}.footer{padding:40px 15px 20px}}.welcome-container::-webkit-scrollbar{width:8px}.welcome-container::-webkit-scrollbar-track{background:#0000004d}.welcome-container::-webkit-scrollbar-thumb{background:#00f0ff33;border-radius:4px;transition:background .3s ease}.welcome-container::-webkit-scrollbar-thumb:hover{background:#00f0ff66}.btn-primary:focus-visible,.btn-secondary:focus-visible{outline:2px solid var(--neon-cyan);outline-offset:2px}.footer-link:focus-visible{outline:2px solid var(--neon-cyan);outline-offset:2px;border-radius:4px}@media print{.welcome-container{background:#fff;color:#000}.particle-canvas{display:none}.btn-primary,.btn-secondary{border:2px solid black;color:#000}}.auth-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,var(--gradient-start, #667eea) 0%,var(--gradient-end, #764ba2) 100%);padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif}.auth-card{width:100%;max-width:450px;background:var(--bg-secondary, #ffffff);border-radius:12px;box-shadow:0 20px 60px #0000004d;padding:40px;position:relative;color:var(--text-primary, #1a1a1a)}[data-theme=dark] .auth-card{background:#1e1e1e;color:#fff}.auth-header{text-align:center;margin-bottom:30px}.auth-header h1{font-size:28px;font-weight:700;margin:0 0 10px;color:var(--text-primary, #1a1a1a)}[data-theme=dark] .auth-header h1{color:#fff}.auth-header p{font-size:14px;color:var(--text-secondary, #666666);margin:0}[data-theme=dark] .auth-header p{color:#b0b0b0}.auth-form{display:flex;flex-direction:column;gap:20px}.form-group{display:flex;flex-direction:column;gap:8px}.form-group label{font-size:14px;font-weight:600;color:var(--text-primary, #1a1a1a)}[data-theme=dark] .form-group label{color:#fff}.input-wrapper{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-tertiary, #f5f5f5);border:2px solid transparent;border-radius:12px;transition:all .3s ease}[data-theme=dark] .input-wrapper{background:#2a2a2a;border-color:#3a3a3a}.input-wrapper:focus-within{background:var(--bg-secondary, #ffffff);border-color:var(--accent-primary, #667eea)}[data-theme=dark] .input-wrapper:focus-within{background:#333;border-color:#667eea}.input-wrapper svg{color:var(--text-secondary, #999999);flex-shrink:0}.input-wrapper input{flex:1;border:none;background:transparent;font-size:14px;color:var(--text-primary, #1a1a1a);outline:none;font-family:inherit}[data-theme=dark] .input-wrapper input{color:#fff}.input-wrapper input::placeholder{color:var(--text-secondary, #999999)}[data-theme=dark] .input-wrapper input::placeholder{color:#777}.input-wrapper input:disabled{opacity:.6;cursor:not-allowed}.auth-button{padding:13px 24px;border:none;border-radius:14px;font-size:14px;font-weight:700;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;letter-spacing:.5px;text-transform:uppercase}.auth-button:disabled{opacity:.6;cursor:not-allowed}.auth-button.primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 4px 15px #667eea4d}.auth-button.primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 24px #667eea80}.auth-button.google{background:var(--bg-tertiary, #f5f5f5);color:var(--text-primary, #1a1a1a);border:2px solid var(--border-color, #e0e0e0)}[data-theme=dark] .auth-button.google{background:#2a2a2a;color:#fff;border-color:#3a3a3a}.auth-button.google:hover:not(:disabled){background:var(--bg-secondary, #ffffff);transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.auth-button.logout{background:linear-gradient(135deg,#ff6b6b,#ff5252);color:#fff;margin-top:20px;box-shadow:0 4px 15px #ff6b6b4d}.auth-button.logout:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #ff6b6b66}.spinner-icon{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-alert{background:#fee;color:#c33;padding:12px 16px;border-radius:12px;border-left:4px solid #c33;display:flex;justify-content:space-between;align-items:center;font-size:14px;margin-bottom:20px}[data-theme=dark] .error-alert{background:#3a2222;color:#f77;border-left-color:#f77}.error-close{background:none;border:none;color:inherit;font-size:18px;cursor:pointer;padding:0;margin-left:10px}.success-alert{text-align:center;padding:20px;background:#f0f9ff;border-radius:16px;border:2px solid #0084ff}[data-theme=dark] .success-alert{background:#1a2a3a;border-color:#0084ff}.success-icon{font-size:48px;line-height:1;margin-bottom:15px;color:#0084ff}.success-alert h3{font-size:20px;font-weight:600;margin:10px 0;color:var(--text-primary, #1a1a1a)}[data-theme=dark] .success-alert h3{color:#fff}.success-alert p{font-size:14px;color:var(--text-secondary, 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