@import url("https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;1,300&family=DM+Mono:wght@400;500&display=swap");:root{--bg:#07080f;--bg2:#0d0f1e;--surface:#11142b;--surface2:#181c38;--surface3:#1e2340;--accent:#4f6ef7;--accent2:#7c3aed;--accent-hover:#6b82f8;--gold:#f5c842;--teal:#06d6a0;--red:#ef4444;--orange:#f97316;--text:#e8eaf6;--text2:#a0a8c0;--muted:#6b7280;--border:rgba(79,110,247,.15);--border2:hsla(0,0%,100%,.06);--shadow:0 20px 60px rgba(0,0,0,.4);--radius:16px;--radius-sm:10px;--radius-lg:24px;--font-display:"Syne",sans-serif;--font-body:"DM Sans",sans-serif;--font-mono:"DM Mono",monospace}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{background:var(--bg);color:var(--text);font-family:var(--font-body);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}body:before{content:"";background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");opacity:.022}.mesh-bg,body:before{position:fixed;inset:0;z-index:0;pointer-events:none}.mesh-bg{background:radial-gradient(ellipse 80% 60% at 10% 20%,rgba(79,110,247,.1) 0,transparent 60%),radial-gradient(ellipse 60% 50% at 90% 80%,rgba(124,58,237,.08) 0,transparent 60%),radial-gradient(ellipse 50% 40% at 50% 50%,rgba(6,214,160,.03) 0,transparent 60%)}h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.15;letter-spacing:-.02em}h1{font-size:clamp(22px,3vw,42px)}h2{font-size:clamp(18px,2.5vw,30px)}h3{font-size:clamp(15px,1.8vw,20px)}h4{font-size:15px}p{color:var(--text2);line-height:1.7}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 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14px;font-size:13px}.btn-teal{background:linear-gradient(135deg,var(--teal),#059669);color:var(--bg)}.btn-gold{background:linear-gradient(135deg,var(--gold),var(--orange));color:var(--bg)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:all .3s}.card:hover{border-color:rgba(79,110,247,.3);transform:translateY(-3px);box-shadow:0 20px 50px rgba(0,0,0,.25)}.card-glass{background:rgba(17,20,43,.6);backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius)}.badge{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:100px;font-size:11px;font-weight:600;font-family:var(--font-mono);letter-spacing:.05em}.badge-blue{background:rgba(79,110,247,.12);border:1px solid rgba(79,110,247,.25);color:var(--accent)}.badge-teal{background:rgba(6,214,160,.12);border:1px solid rgba(6,214,160,.25);color:var(--teal)}.badge-gold{background:rgba(245,200,66,.12);border:1px solid rgba(245,200,66,.25);color:var(--gold)}.badge-purple{background:rgba(124,58,237,.12);border:1px solid rgba(124,58,237,.25);color:#a78bfa}.badge-red{background:rgba(239,68,68,.12);border:1px solid rgba(239,68,68,.25);color:var(--red)}.label{font-family:var(--font-mono);font-size:11px;font-weight:500;color:var(--accent);letter-spacing:.14em;text-transform:uppercase;margin-bottom:12px;display:block}.input{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 16px;color:var(--text);font-family:var(--font-body);font-size:15px;outline:none;transition:border-color .2s;width:100%}.input:focus{border-color:var(--accent)}.input::-moz-placeholder{color:var(--muted)}.input::placeholder{color:var(--muted)}.input-mono{font-family:var(--font-mono);font-size:16px}.progress{height:6px;background:var(--surface2);border-radius:100px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--teal));border-radius:100px;transition:width .8s ease}.divider{height:1px;background:var(--border);margin:24px 0}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--surface2);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:var(--accent)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes 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0;position:relative;z-index:1}.flex{display:flex}.flex-center{display:flex;align-items:center;justify-content:center}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-2,.grid-3{display:grid;gap:20px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.math-display{font-size:17px;color:var(--text);background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 20px}.math-display,.math-inline{font-family:var(--font-mono)}.math-inline{color:var(--accent);background:rgba(79,110,247,.08);padding:2px 8px;border-radius:6px;font-size:14px}.app-layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}@media(max-width:900px){.app-layout{grid-template-columns:1fr}}.step-card{display:flex;gap:16px;padding:14px 18px;background:hsla(0,0%,100%,.02);border:1px solid hsla(0,0%,100%,.05);border-radius:12px}.step-num{min-width:28px;height:28px;background:linear-gradient(135deg,var(--accent),var(--accent2));border-radius:8px;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:12px;color:#fff;flex-shrink:0}.step-body{flex:1}.step-label{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}.step-math{font-family:var(--font-mono);font-size:15px;color:var(--text)}.bubble{max-width:80%;padding:14px 18px;border-radius:18px;font-size:14px;line-height:1.6}.bubble-user{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border-bottom-right-radius:4px;align-self:flex-end}.bubble-ai{background:var(--surface2);border:1px solid var(--border);color:var(--text);border-bottom-left-radius:4px;align-self:flex-start}.skeleton{background:linear-gradient(90deg,var(--surface) 25%,var(--surface2) 50%,var(--surface) 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:8px}