:root{--primary-blue:#6366f1;--primary-green:#10b981;--primary-purple:#8b5cf6;--primary-orange:#f97316;--primary-pink:#ec4899;--primary-teal:#06b6d4;--primary-red:#ef4444;--text-primary:#1f2937;--text-dark:#1f2937;--text-gray:#6b7280;--text-light:#9ca3af;--bg-white:#fff;--bg-light:#f8fafc;--bg-gray:#f1f5f9;--border-light:#e2e8f0;--accent-yellow:#fbbf24;--accent-morning:#fb923c;--gradient-primary:linear-gradient(135deg,var(--primary-blue) 0%,var(--primary-purple) 100%);--gradient-warm:linear-gradient(135deg,var(--primary-orange) 0%,var(--primary-pink) 100%);--gradient-cool:linear-gradient(135deg,var(--primary-teal) 0%,var(--primary-green) 100%)}[data-theme=dark]{--text-primary:#f9fafb;--text-dark:#f9fafb;--text-gray:#d1d5db;--text-light:#9ca3af;--bg-white:#1f2937;--bg-light:#111827;--bg-gray:#374151;--border-light:#4b5563}*{box-sizing:border-box;margin:0;padding:0}html{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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.not-found-message{background:hsla(0,0%,100%,.95);border:1px solid rgba(99,102,241,.12);box-shadow:0 20px 60px rgba(99,102,241,.08);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px)}[data-theme=light] .error-code{color:var(--primary-blue);text-shadow:0 4px 16px rgba(99,102,241,.25);filter:drop-shadow(0 2px 8px rgba(99,102,241,.2))}[data-theme=light] .error-label{color:var(--primary-blue);text-shadow:0 2px 8px rgba(99,102,241,.25);filter:drop-shadow(0 1px 4px rgba(99,102,241,.2))}[data-theme=light] .not-found-title{background:linear-gradient(135deg,var(--primary-purple) 0,var(--primary-blue) 50%,var(--primary-teal) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;filter:drop-shadow(0 2px 8px rgba(99,102,241,.15))}[data-theme=light] .fun-btn{box-shadow:0 8px 32px rgba(0,0,0,.12);border:2px solid transparent}[data-theme=light] .fun-btn:hover{transform:translateY(-4px) scale(1.02);box-shadow:0 12px 40px rgba(0,0,0,.18)}[data-theme=light] .btn-primary.fun-btn{background:linear-gradient(135deg,#6366f1,#8b5cf6);border-color:rgba(99,102,241,.3)}[data-theme=light] .btn-secondary.fun-btn{background:linear-gradient(135deg,#06b6d4,#10b981);border-color:rgba(6,182,212,.3)}[data-theme=light] .btn-accent.fun-btn{background:linear-gradient(135deg,#f59e0b,#ec4899);border-color:rgba(245,158,11,.3)}[data-theme=light] .quick-link{background:hsla(0,0%,100%,.8);border:1px solid rgba(99,102,241,.2);color:var(--text-dark);box-shadow:0 2px 12px rgba(99,102,241,.1)}[data-theme=light] .quick-link:hover{background:hsla(0,0%,100%,.95);border-color:var(--primary-purple);color:var(--primary-purple);transform:translateY(-2px);box-shadow:0 8px 24px rgba(99,102,241,.15)}[data-theme=light] .helpful-text{color:var(--text-dark);font-weight:600}.bg-elements{top:0;z-index:0}.bg-elements,.skyline{position:absolute;left:0;right:0;bottom:0}.skyline{height:200px;background:linear-gradient(0deg,rgba(99,102,241,.1) 0,rgba(139,92,246,.05) 50%,transparent)}.skyline:before{content:"";position:absolute;bottom:0;left:0;right:0;height:150px;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 1200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='0' y='80' width='60' height='120' fill='%236366f1' opacity='0.15'/%3E%3Crect x='80' y='60' width='80' height='140' fill='%238b5cf6' opacity='0.18'/%3E%3Crect x='180' y='40' width='60' height='160' fill='%2306b6d4' opacity='0.12'/%3E%3Crect x='260' y='70' width='70' height='130' fill='%23f59e0b' opacity='0.15'/%3E%3Crect x='350' y='50' width='90' height='150' fill='%23ec4899' opacity='0.16'/%3E%3Crect x='460' y='80' width='50' height='120' fill='%236366f1' opacity='0.14'/%3E%3Crect x='530' y='30' width='80' height='170' fill='%238b5cf6' opacity='0.17'/%3E%3Crect x='630' y='60' width='60' height='140' fill='%2306b6d4' opacity='0.13'/%3E%3Crect x='710' y='90' width='70' height='110' fill='%23f59e0b' opacity='0.15'/%3E%3Crect x='800' y='45' width='85' height='155' fill='%23ec4899' opacity='0.16'/%3E%3Crect x='900' y='75' width='55' height='125' fill='%236366f1' opacity='0.14'/%3E%3Crect x='970' y='35' width='75' height='165' fill='%238b5cf6' opacity='0.17'/%3E%3Crect x='1060' y='85' width='65' height='115' fill='%2306b6d4' opacity='0.13'/%3E%3Crect x='1140' y='55' width='60' height='145' fill='%23f59e0b' opacity='0.15'/%3E%3C/svg%3E") bottom/cover no-repeat}.cloud{position:absolute;font-size:3rem;color:rgba(99,102,241,.3);text-shadow:0 2px 10px rgba(0,0,0,.1);animation:float-clouds 6s ease-in-out infinite}.cloud-1{top:10%;left:15%;animation-delay:0s;color:rgba(139,92,246,.25)}.cloud-2{top:25%;right:20%;font-size:2.5rem;animation-delay:2s;color:rgba(6,182,212,.3)}.cloud-3{top:40%;left:75%;font-size:2rem;animation-delay:4s;color:rgba(236,72,153,.25)}@keyframes float-clouds{0%,to{transform:translateY(0) translateX(0)}50%{transform:translateY(-20px) translateX(10px)}}.not-found-content{position:relative;z-index:1;text-align:center;max-width:900px;margin:0 auto;padding:2rem 1rem}.not-found-visual{margin-bottom:2rem;position:relative;display:inline-block}.error-code{text-shadow:0 8px 32px rgba(99,102,241,.3);filter:drop-shadow(0 4px 8px rgba(139,92,246,.2))}.error-code,.error-label{font-family:Inter,system-ui,sans-serif;color:var(--primary-blue)}.error-label{font-size:2.5rem;font-weight:800;margin-bottom:1rem;letter-spacing:.1em;text-shadow:0 4px 16px rgba(99,102,241,.3)}.character{transform:rotate(8deg)}.character-body{background:linear-gradient(135deg,var(--primary-blue) 0,var(--primary-purple) 100%);box-shadow:0 8px 25px rgba(99,102,241,.25)}.character-head{box-shadow:0 4px 15px rgba(99,102,241,.2)}.not-found-title{background:linear-gradient(135deg,var(--primary-purple) 0,var(--primary-blue) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 2px 8px rgba(99,102,241,.15)}.not-found-message{padding:2rem;font-weight:500;color:var(--text-gray);background:#fff;border:1px solid rgba(99,102,241,.1);box-shadow:0 8px 32px rgba(0,0,0,.08)}.fun-btn{border-radius:16px;box-shadow:0 4px 20px rgba(0,0,0,.1);border:2px solid transparent;text-transform:none;letter-spacing:.02em}.btn-primary.fun-btn{background:linear-gradient(135deg,var(--primary-purple),var(--primary-blue));color:#fff;border-color:var(--primary-purple)}.btn-secondary.fun-btn{background:linear-gradient(135deg,var(--primary-teal),var(--primary-green));color:#fff;border-color:var(--primary-teal)}.btn-accent.fun-btn{background:linear-gradient(135deg,var(--primary-orange),var(--primary-pink));color:#fff;border-color:var(--primary-orange)}.fun-btn:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 8px 30px rgba(0,0,0,.15)}.helpful-links{background:hsla(0,0%,100%,.8);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid rgba(99,102,241,.1);box-shadow:0 8px 32px rgba(0,0,0,.08)}.helpful-text{margin-bottom:1.5rem;font-weight:600;font-size:1rem;color:var(--text-primary)}.quick-links{gap:1rem}.quick-link{padding:.75rem 1.5rem;border-radius:12px;font-weight:600;display:flex;align-items:center;gap:.5rem;color:var(--text-primary);background:rgba(99,102,241,.08);border:1px solid rgba(99,102,241,.2)}.quick-link:hover{background:rgba(99,102,241,.15);border-color:var(--primary-purple);box-shadow:0 4px 15px rgba(99,102,241,.2);color:var(--primary-purple)}.quick-link span{font-size:1.1rem}@media (max-width:768px){.error-code{font-size:8rem}.error-label{font-size:2rem}.character{right:-2rem;transform:scale(.8) rotate(8deg)}.not-found-actions{flex-direction:column;align-items:center}.fun-btn{width:100%;max-width:300px}.quick-links{flex-direction:column;gap:.75rem}.helpful-links{padding:1.5rem}.cloud{font-size:2rem}.cloud-2{font-size:1.8rem}.cloud-3{font-size:1.5rem}}[data-theme=dark] .error-code{color:#fff;text-shadow:4px 4px 0 #dc2626,8px 8px 0 #b91c1c,12px 12px 20px rgba(0,0,0,.3);font-family:Comic Sans MS,cursive,sans-serif;background:none;-webkit-text-fill-color:#fff}[data-theme=dark] .error-label{color:#dc2626;text-shadow:2px 2px 0 #fff,4px 4px 10px rgba(0,0,0,.2);font-family:Comic Sans MS,cursive,sans-serif;letter-spacing:.2em;background:none;-webkit-text-fill-color:#dc2626}[data-theme=dark] .not-found-message{color:hsla(0,0%,100%,.95);background:hsla(0,0%,100%,.1);border:2px solid hsla(0,0%,100%,.3);padding:1.5rem;box-shadow:none}[data-theme=dark] .not-found-title{color:#fff;text-shadow:2px 2px 4px rgba(0,0,0,.3);background:none;-webkit-text-fill-color:#fff}.character{position:absolute;bottom:-2rem;right:-4rem;transform:rotate(15deg);animation:character-bounce 2s ease-in-out infinite}.character-body{position:relative;background:var(--primary-blue);width:80px;height:100px;border-radius:40px 40px 20px 20px;border:3px solid #fff;box-shadow:0 4px 15px rgba(0,0,0,.2)}.character-head{position:absolute;top:-30px;left:50%;transform:translateX(-50%);font-size:2.5rem;background:#fff;width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:3px solid var(--primary-blue);box-shadow:0 2px 10px rgba(0,0,0,.1)}.character-arm{position:absolute;top:20px;right:-25px;font-size:1.8rem;animation:wave 1s ease-in-out infinite}@keyframes character-bounce{0%,to{transform:rotate(15deg) translateY(0)}50%{transform:rotate(15deg) translateY(-10px)}}@keyframes wave{0%,to{transform:rotate(0deg)}25%{transform:rotate(20deg)}75%{transform:rotate(-20deg)}}.not-found-title{text-shadow:2px 2px 4px rgba(0,0,0,.3);font-weight:800}.not-found-message{font-size:1.1rem;background:hsla(0,0%,100%,.1);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:1.5rem;border-radius:20px;border:2px solid hsla(0,0%,100%,.3)}.not-found-actions{margin-bottom:3rem}.fun-btn{display:inline-flex;align-items:center;gap:.5rem;min-width:180px;padding:1rem 2rem;border-radius:25px;font-weight:700;box-shadow:0 6px 20px rgba(0,0,0,.3);transition:all .3s ease;border:3px solid #fff;text-transform:uppercase;letter-spacing:.05em}.fun-btn:hover{transform:translateY(-5px) scale(1.05);box-shadow:0 10px 30px rgba(0,0,0,.4)}.fun-btn span{font-size:1.3rem;animation:bounce-icon 2s ease-in-out infinite}@keyframes bounce-icon{0%,to{transform:scale(1)}50%{transform:scale(1.2)}}.helpful-links{background:hsla(0,0%,100%,.2);-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);border-radius:20px;border:2px solid hsla(0,0%,100%,.3);box-shadow:0 8px 25px rgba(0,0,0,.2)}[data-theme=dark] .helpful-text{color:#fff;font-weight:700;font-size:1.1rem}[data-theme=dark] .quick-link{color:#fff;background:hsla(0,0%,100%,.15);border:2px solid hsla(0,0%,100%,.4);padding:1rem 1.5rem;border-radius:15px}[data-theme=dark] .quick-link:hover{background:hsla(0,0%,100%,.3);border-color:#fff;transform:translateY(-3px);box-shadow:0 5px 15px rgba(0,0,0,.2);color:#fff}@media (max-width:768px){.error-code{font-size:8rem}.error-label{font-size:2rem}.character{right:-2rem;transform:scale(.8) rotate(15deg)}.not-found-actions{flex-direction:column;align-items:center}.fun-btn{width:100%;max-width:300px}.quick-links{flex-direction:column;gap:.75rem}.helpful-links{padding:1.5rem}.cloud{font-size:2rem}.cloud-2{font-size:1.8rem}.cloud-3{font-size:1.5rem}}.error-code{font-size:12rem;font-weight:900;color:#fff;text-shadow:4px 4px 0 #dc2626,8px 8px 0 #b91c1c,12px 12px 20px rgba(0,0,0,.3);line-height:.8;margin-bottom:.5rem;font-family:Comic Sans MS,cursive,sans-serif}.error-emoji{font-size:4rem;animation:float 3s ease-in-out infinite;display:inline-block}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}.not-found-title{color:#fff;margin-bottom:1.5rem;text-shadow:0 2px 10px rgba(0,0,0,.2)}.not-found-message{color:hsla(0,0%,100%,.95);margin-bottom:3rem;max-width:600px;margin-left:auto;margin-right:auto;line-height:1.6}.not-found-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-bottom:4rem}.not-found-actions .btn{display:inline-flex;align-items:center;gap:.5rem;min-width:180px;box-shadow:0 4px 15px rgba(0,0,0,.2);transition:all .3s ease}.not-found-actions .btn:hover{transform:translateY(-3px);box-shadow:0 6px 25px rgba(0,0,0,.3)}.not-found-actions .btn span{font-size:1.2rem}.helpful-links{background:hsla(0,0%,100%,.15);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:1rem;padding:2rem;border:1px solid hsla(0,0%,100%,.2)}.not-found-container .quick-link{color:#fff;background:hsla(0,0%,100%,.1);border:1px solid hsla(0,0%,100%,.3);padding:.5rem 1rem;border-radius:.5rem;font-weight:500}.not-found-container .quick-link:hover{background:hsla(0,0%,100%,.25);border-color:hsla(0,0%,100%,.5);transform:translateY(-2px);color:#fff;box-shadow:0 2px 8px hsla(0,0%,100%,.1)}.not-found-container .quick-links{gap:1.5rem}.quick-links{display:flex;gap:1.5rem;justify-content:center;flex-wrap:wrap}.quick-link{color:#fff;text-decoration:none;padding:.5rem 1rem;border-radius:.5rem;background:hsla(0,0%,100%,.1);border:1px solid hsla(0,0%,100%,.3);transition:all .3s ease;font-size:.95rem;font-weight:500}.quick-link:hover{background:hsla(0,0%,100%,.25);border-color:hsla(0,0%,100%,.5);transform:translateY(-2px)}@media (max-width:768px){.error-code{font-size:6rem}.error-emoji{font-size:3rem}.not-found-actions{flex-direction:column;align-items:center}.not-found-actions .btn{width:100%;max-width:300px}.quick-links{flex-direction:column;gap:.75rem}.helpful-links{padding:1.5rem}}.theme-toggle-container{position:fixed;bottom:2rem;right:2rem;z-index:100}.theme-toggle{display:flex;align-items:center;justify-content:center;width:3.5rem;height:3.5rem;border-radius:50%;background:var(--bg-white);border:2px solid var(--border-light);cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px rgba(0,0,0,.15);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.theme-toggle:hover{transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,0,0,.2);border-color:var(--primary-purple)}.theme-toggle-icon{font-size:1.5rem;transition:all .3s ease}[data-theme=dark] .theme-toggle-icon.light,[data-theme=light] .theme-toggle-icon.dark{display:none}.theme-toggle-tooltip{position:absolute;bottom:100%;right:0;margin-bottom:.5rem;padding:.5rem .75rem;background:var(--bg-gray);color:var(--text-primary);border-radius:.5rem;font-size:.75rem;font-weight:500;white-space:nowrap;opacity:0;transform:translateY(.25rem);transition:all .2s ease;pointer-events:none;border:1px solid var(--border-light)}.theme-toggle:hover .theme-toggle-tooltip{opacity:1;transform:translateY(0)}[data-theme=dark]{color-scheme:dark}[data-theme=dark] .not-found-section{background:linear-gradient(135deg,#111827,#1f2937 50%,#374151)}[data-theme=dark] .skyline{background:linear-gradient(0deg,rgba(99,102,241,.25) 0,rgba(139,92,246,.15) 50%,transparent)}[data-theme=dark] .skyline:before{background:url("data:image/svg+xml,%3Csvg viewBox='0 0 1200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Crect x='0' y='80' width='60' height='120' fill='%236366f1' opacity='0.4'/%3E%3Crect x='80' y='60' width='80' height='140' fill='%238b5cf6' opacity='0.45'/%3E%3Crect x='180' y='40' width='60' height='160' fill='%2306b6d4' opacity='0.35'/%3E%3Crect x='260' y='70' width='70' height='130' fill='%23f59e0b' opacity='0.4'/%3E%3Crect x='350' y='50' width='90' height='150' fill='%23ec4899' opacity='0.42'/%3E%3Crect x='460' y='80' width='50' height='120' fill='%236366f1' opacity='0.38'/%3E%3Crect x='530' y='30' width='80' height='170' fill='%238b5cf6' opacity='0.43'/%3E%3Crect x='630' y='60' width='60' height='140' fill='%2306b6d4' opacity='0.37'/%3E%3Crect x='710' y='90' width='70' height='110' fill='%23f59e0b' opacity='0.4'/%3E%3Crect x='800' y='45' width='85' height='155' fill='%23ec4899' opacity='0.42'/%3E%3Crect x='900' y='75' width='55' height='125' fill='%236366f1' opacity='0.38'/%3E%3Crect x='970' y='35' width='75' height='165' fill='%238b5cf6' opacity='0.43'/%3E%3Crect x='1060' y='85' width='65' height='115' fill='%2306b6d4' opacity='0.37'/%3E%3Crect x='1140' y='55' width='60' height='145' fill='%23f59e0b' opacity='0.4'/%3E%3C/svg%3E") bottom/cover no-repeat}[data-theme=dark] .cloud{color:hsla(0,0%,100%,.6);text-shadow:0 2px 10px rgba(0,0,0,.3)}.theme-toggle-inline{display:flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:50%;background:transparent;border:1px solid var(--border-light);cursor:pointer;transition:all .2s ease;color:var(--text-gray);font-size:.875rem}.theme-toggle-inline:hover{background:var(--bg-gray);border-color:var(--primary-blue);color:var(--text-primary);transform:scale(1.05)}.theme-toggle-inline:active{transform:scale(.95)}.theme-toggle-inline .theme-icon{line-height:1;display:flex;align-items:center;justify-content:center}@media (max-width:768px){.desktop-only{display:none}.mobile-only{display:flex}.header{padding:1rem 0}.header-content{justify-content:space-between}.logo{gap:.5rem}.logo img{width:32px;height:32px}.logo-text{font-size:1rem}.theme-toggle-container{bottom:1rem;right:1rem}.theme-toggle{width:3rem;height:3rem}.theme-toggle-icon{font-size:1.25rem}.mobile-menu-overlay{padding-top:4rem}.theme-toggle-inline{width:2.5rem;height:2.5rem;font-size:1rem}}[data-theme=dark] .hero-section{background:linear-gradient(135deg,var(--primary-purple) 0,var(--primary-blue) 100%)}[data-theme=dark] .features-section{background:var(--gradient-cool)}[data-theme=dark] .features-section:before{background:rgba(0,0,0,.8)}[data-theme=dark] .card{background:var(--bg-gray);border-color:var(--border-light)}[data-theme=dark] .card:hover{box-shadow:0 20px 25px -5px rgba(0,0,0,.3)}[data-theme=dark] .btn-secondary{background:var(--bg-gray);color:var(--text-primary);border-color:var(--border-light)}[data-theme=dark] .btn-secondary:hover{background:var(--bg-white);color:var(--text-dark)}[data-theme=dark] .header{background:var(--bg-white);border-bottom-color:var(--border-light)}[data-theme=dark] .footer{background:var(--bg-gray);border-top-color:var(--border-light)}*{transition:background-color .3s ease,border-color .3s ease,color .3s ease,box-shadow .3s ease}.character,.cloud,.features-section:before,.hero-section:before,.not-found-section,.step-connector,.theme-toggle-icon{transition-property:opacity,transform,background;transition-duration:.3s}