:root{--bg: #09090f;--surface: #0e0e17;--card: #13131f;--card2: #191928;--border: #1e1e30;--border-hi: #2e2e4a;--purple: #8b5cf6;--purple-l: #a78bfa;--purple-dim: rgba(139,92,246,.14);--cyan: #06b6d4;--cyan-dim: rgba(6,182,212,.14);--green: #10b981;--green-dim: rgba(16,185,129,.14);--amber: #f59e0b;--red: #ef4444;--text: #e2e8f0;--text2: #cbd5e1;--muted: #64748b;--muted2: #94a3b8;--radius: 10px;--ff-sans: "Inter", system-ui, sans-serif;--ff-mono: "JetBrains Mono", "Fira Code", monospace;--nav-bg: rgba(9,9,15,.88)}[data-theme=light]{--bg: #f8f9fc;--surface: #eef0f7;--card: #ffffff;--card2: #f0f2f8;--border: #dde1ee;--border-hi:#c4cade;--text: #0f1117;--text2: #1e2535;--muted: #6b7a99;--muted2: #4a5878;--nav-bg: rgba(248,249,252,.92)}[data-theme=light] .bg-orb{opacity:.06}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--ff-sans);background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden;min-height:100dvh;display:flex;flex-direction:column}img,svg{display:block;max-width:100%}button{cursor:pointer;font-family:inherit}a{color:var(--purple-l);text-decoration:none}a:hover{text-decoration:underline}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-hi);border-radius:3px}.bg-orb{position:fixed;border-radius:50%;pointer-events:none;z-index:0;filter:blur(120px);opacity:.15}.bg-orb-1{width:500px;height:500px;top:-150px;left:-100px;background:radial-gradient(circle,var(--purple) 0%,transparent 70%);animation:orb-drift-1 18s ease-in-out infinite alternate}.bg-orb-2{width:400px;height:400px;bottom:-100px;right:-80px;background:radial-gradient(circle,var(--cyan) 0%,transparent 70%);animation:orb-drift-2 22s ease-in-out infinite alternate}@keyframes orb-drift-1{0%{transform:translate(0)}to{transform:translate(60px,40px)}}@keyframes orb-drift-2{0%{transform:translate(0)}to{transform:translate(-40px,-60px)}}.site-nav{position:fixed;inset:0 0 auto;z-index:200;height:56px;background:var(--nav-bg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 1.75rem;gap:1rem}.nav-brand{font-size:.875rem;font-weight:700;background:linear-gradient(135deg,var(--purple-l),var(--cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;flex-shrink:0}.nav-actions{margin-left:auto;display:flex;align-items:center;gap:.5rem}.nav-link{font-size:.8rem;color:var(--muted2);text-decoration:none;padding:.3rem .7rem;border-radius:6px;transition:background .15s,color .15s}.nav-link:hover{color:var(--text);background:#ffffff0d;text-decoration:none}[hidden]{display:none!important}.main{position:relative;z-index:1;flex:1;display:flex;align-items:center;justify-content:center;padding:5rem 1.5rem 3rem}.card{width:100%;max-width:420px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:2.5rem;display:flex;flex-direction:column;gap:1.25rem;box-shadow:0 0 0 1px #8b5cf60f,0 24px 64px #0006}.card-centered{align-items:center;text-align:center}.card-icon{width:52px;height:52px;border-radius:12px;background:var(--purple-dim);border:1px solid rgba(139,92,246,.2);display:flex;align-items:center;justify-content:center;color:var(--purple-l)}.card-title{font-size:1.375rem;font-weight:700;letter-spacing:-.02em;color:var(--text);line-height:1.2}.card-sub{font-size:.875rem;color:var(--muted2);line-height:1.65}.card-legal{font-size:.75rem;color:var(--muted);text-align:center}.btn-google{display:flex;align-items:center;justify-content:center;gap:.625rem;width:100%;padding:.75rem 1.25rem;background:var(--surface);border:1px solid var(--border-hi);border-radius:8px;color:var(--text);font-size:.875rem;font-weight:500;transition:background .15s,border-color .15s,transform .15s}.btn-google:hover{background:var(--card2);border-color:#8b5cf666;transform:translateY(-1px)}.btn-google:active{transform:translateY(0)}.btn-google:disabled{opacity:.5;cursor:not-allowed;transform:none}.divider{display:flex;align-items:center;gap:.75rem;color:var(--muted);font-size:.75rem}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--border)}.field-group{display:flex;gap:.5rem}.field-input{flex:1;background:var(--surface);border:1px solid var(--border-hi);border-radius:8px;padding:.65rem .875rem;color:var(--text);font-size:.875rem;font-family:var(--ff-sans);outline:none;transition:border-color .15s,box-shadow .15s}.field-input::placeholder{color:var(--muted)}.field-input:focus{border-color:var(--purple);box-shadow:0 0 0 3px #8b5cf61f}.field-input.error{border-color:var(--red);box-shadow:0 0 0 3px #ef44441a}.btn-submit{display:inline-flex;align-items:center;gap:.375rem;padding:.65rem 1.1rem;background:linear-gradient(135deg,var(--purple),#7c3aed);border:none;border-radius:8px;color:#fff;font-size:.875rem;font-weight:600;white-space:nowrap;transition:opacity .15s,transform .15s,box-shadow .15s;box-shadow:0 2px 12px #8b5cf640}.btn-submit:hover{transform:translateY(-1px);box-shadow:0 4px 20px #8b5cf659}.btn-submit:disabled{opacity:.5;cursor:not-allowed;transform:none}.field-error{font-size:.75rem;color:var(--red);margin-top:-.25rem}.spinner{width:44px;height:44px;position:relative}.spinner-ring{width:100%;height:100%;border-radius:50%;border:3px solid var(--border);border-top-color:var(--purple);animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.success-icon{width:56px;height:56px;border-radius:50%;background:var(--green-dim);border:1px solid rgba(16,185,129,.25);display:flex;align-items:center;justify-content:center;color:var(--green)}.success-icon-cyan{background:var(--cyan-dim);border-color:#06b6d440;color:var(--cyan)}.success-email{font-size:.8rem;font-family:var(--ff-mono);color:var(--purple-l);background:var(--purple-dim);border:1px solid rgba(139,92,246,.2);border-radius:6px;padding:.3rem .7rem}.btn-text{background:none;border:none;color:var(--purple-l);font-size:.875rem;font-weight:500;cursor:pointer;padding:0;transition:color .15s}.btn-text:hover{color:var(--cyan);text-decoration:underline}.card{animation:card-in .3s ease both}@keyframes card-in{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@media(max-width:480px){.card{padding:1.75rem 1.25rem}.field-group{flex-direction:column}.btn-submit{width:100%;justify-content:center}.site-nav{padding:0 1rem}}.content-grid{width:100%;max-width:940px;display:grid;grid-template-columns:1fr 380px;gap:5rem;align-items:center}.form-col .card{max-width:none;width:100%}.intro-col{display:flex;flex-direction:column;gap:1.5rem}.intro-eyebrow{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--purple-l)}.intro-heading{font-size:clamp(2rem,4vw,2.75rem);font-weight:800;letter-spacing:-.03em;line-height:1.1;color:var(--text)}.heading-gradient{background:linear-gradient(135deg,var(--purple-l),var(--cyan));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.intro-desc{font-size:.9375rem;color:var(--muted2);line-height:1.7;max-width:38ch}.feature-list{list-style:none;display:flex;flex-direction:column;gap:1.125rem}.feature-item{display:flex;gap:.875rem;align-items:flex-start}.feature-icon-wrap{flex-shrink:0;width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center}.fi-purple{background:var(--purple-dim);border:1px solid rgba(139,92,246,.2);color:var(--purple-l)}.fi-cyan{background:var(--cyan-dim);border:1px solid rgba(6,182,212,.2);color:var(--cyan)}.fi-green{background:var(--green-dim);border:1px solid rgba(16,185,129,.2);color:var(--green)}.feature-text{display:flex;flex-direction:column;gap:.2rem}.feature-text strong{font-size:.875rem;font-weight:600;color:var(--text)}.feature-text span{font-size:.8rem;color:var(--muted2);line-height:1.5}.topics-section{display:flex;flex-direction:column;gap:.625rem}.topics-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.topic-chips{display:flex;flex-wrap:wrap;gap:.4rem}.chip{font-size:.72rem;font-family:var(--ff-mono);color:var(--muted2);background:var(--surface);border:1px solid var(--border-hi);border-radius:20px;padding:.2rem .65rem;white-space:nowrap}.form-col .field-group{flex-direction:column}.form-col .btn-submit{width:100%;justify-content:center}.bg-orb-3{width:300px;height:300px;top:50%;left:50%;transform:translate(-50%,-50%);background:radial-gradient(circle,var(--purple) 0%,transparent 70%);animation:orb-drift-1 26s ease-in-out infinite alternate;opacity:.05}.viz-panel{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.25rem;-webkit-user-select:none;user-select:none}.viz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.viz-label{font-family:var(--ff-mono);font-size:.72rem;color:var(--purple-l)}.viz-step{font-family:var(--ff-mono);font-size:.68rem;color:var(--muted)}.viz-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}.viz-token{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:6px;height:38px;display:flex;align-items:center;justify-content:center;overflow:hidden;transition:border-color .4s}.viz-mask{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;transition:opacity .35s ease}.viz-mask:after{content:"";display:block;width:56%;height:7px;background:var(--border-hi);border-radius:3px;animation:viz-shimmer 1.8s ease-in-out infinite}@keyframes viz-shimmer{0%,to{opacity:.4}50%{opacity:.85}}.viz-word{font-family:var(--ff-mono);font-size:.67rem;color:var(--purple-l);opacity:0;transition:opacity .35s ease;position:relative;z-index:1;white-space:nowrap}.viz-token.revealed{border-color:#8b5cf661}.viz-token.revealed .viz-mask{opacity:0}.viz-token.revealed .viz-word{opacity:1}.viz-token.flash{animation:viz-flash .4s ease}@keyframes viz-flash{0%{background:#8b5cf638}to{background:var(--surface)}}.viz-footer{margin-top:1rem}.viz-progress{height:2px;background:var(--border);border-radius:1px;overflow:hidden}.viz-fill{height:100%;background:linear-gradient(90deg,var(--purple),var(--cyan));border-radius:1px;width:0%;transition:width .2s ease}@media(max-width:720px){.content-grid{grid-template-columns:1fr;gap:2.5rem;max-width:440px}.intro-desc{max-width:none}}@media(max-width:480px){#hero-viz{display:none}.main{padding-top:4rem}.intro-heading{font-size:clamp(1.75rem,7vw,2.25rem)}}.btn-icon{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:6px;border:1px solid var(--border-hi);background:transparent;color:var(--muted2);cursor:pointer;transition:background .15s,color .15s,border-color .15s;font-size:.7rem;font-weight:700;font-family:var(--ff-sans);padding:0;flex-shrink:0}.btn-icon:hover{background:var(--purple-dim);color:var(--purple-l);border-color:#8b5cf659}[data-theme=light] .nav-link:hover{background:#0000000f;color:var(--text)}[data-theme=light] .btn-icon:hover{color:var(--purple)}[data-theme=light] .field-input{background:var(--surface)}.auth-container{position:relative;display:flex;align-items:center}.btn-signin{display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 12px;border-radius:6px;border:1px solid var(--border-hi);background:var(--surface);color:var(--text);font-size:.8rem;font-weight:500;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);outline:none}.btn-signin:hover{background:var(--border);border-color:var(--purple-l);box-shadow:0 0 12px #8b5cf640;transform:translateY(-1px)}.btn-signin svg{width:14px;height:14px;flex-shrink:0}.user-profile{position:relative;display:flex;align-items:center}.user-avatar{width:30px;height:30px;border-radius:50%;border:2px solid var(--border-hi);cursor:pointer;transition:all .2s ease;object-fit:cover}.user-avatar:hover{border-color:var(--purple-l);transform:scale(1.05);box-shadow:0 0 10px #8b5cf64d}.user-dropdown{position:absolute;top:calc(100% + 8px);right:0;width:220px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 10px 25px -5px #0000004d,0 8px 10px -6px #0000004d;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);padding:12px;display:none;flex-direction:column;gap:8px;z-index:1000;animation:dropdown-fade .2s cubic-bezier(.16,1,.3,1)}.user-dropdown.is-open{display:flex}@keyframes dropdown-fade{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.dropdown-user-info{display:flex;flex-direction:column;border-bottom:1px solid var(--border);padding-bottom:8px;margin-bottom:4px}.dropdown-user-name{font-weight:600;font-size:.85rem;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.dropdown-user-email{font-size:.75rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.btn-signout{display:flex;align-items:center;justify-content:center;gap:6px;width:100%;height:28px;border-radius:4px;border:1px solid var(--border-hi);background:transparent;color:var(--text2);font-size:.75rem;font-weight:500;cursor:pointer;transition:all .15s ease}.btn-signout:hover{background:#ef444414;border-color:var(--red);color:var(--red)}