:root{color-scheme:dark;--bg:#1d1e27;--surface:#292b38;--border:#404354;--text:#f5f3f0;--muted:#b9bbc7;--cyan:#8ce4f4;--cyan-dark:#062732;--violet:#aa88dd}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Georgia,'Times New Roman',serif;line-height:1.6}
a{color:var(--cyan)}
a:focus-visible{outline:3px solid var(--cyan);outline-offset:4px}
img{max-width:100%}
.shell{width:min(1160px,calc(100% - 48px));margin-inline:auto}
.site-header{border-bottom:1px solid var(--border);background:rgba(29,30,39,.96)}
.header-inner{min-height:84px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;font:700 22px/1.2 Arial,sans-serif;white-space:nowrap}
.brand img{border-radius:50%}
nav{display:flex;align-items:center;gap:28px;font:600 14px/1.3 Arial,sans-serif}
nav a{color:var(--muted);text-decoration:none}
nav a:hover,.text-link:hover,.info-card a:hover,footer a:hover{color:var(--text)}
nav .nav-github{color:var(--cyan)}
.nav-account{border:1px solid var(--violet);border-radius:8px;background:var(--violet);color:#1d1e27;padding:10px 17px;font:700 14px/1.3 Arial,sans-serif;white-space:nowrap;cursor:pointer}
.nav-account:hover{background:#c3a8ea}
.nav-account:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}
.hero{min-height:610px;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);align-items:center;gap:50px;padding-block:82px 92px}
.eyebrow{margin:0 0 18px;color:var(--cyan);font:700 12px/1.4 Arial,sans-serif;letter-spacing:.19em}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(3.25rem,6vw,5.7rem);line-height:1.06;letter-spacing:-.045em;margin-bottom:28px}
h1 em{color:var(--cyan);font-style:normal}
.lede{max-width:670px;font-size:1.25rem;line-height:1.7;color:var(--muted);margin-bottom:30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.button{display:inline-flex;justify-content:center;align-items:center;gap:14px;min-height:52px;padding:13px 20px;border-radius:8px;text-decoration:none;font:700 15px/1.25 Arial,sans-serif;transition:transform .15s ease,background .15s ease}
.button:hover{transform:translateY(-2px)}
.button-primary{background:var(--cyan);color:var(--cyan-dark)}
.button-primary:hover{background:#b5f1fa;color:var(--cyan-dark)}
.button-secondary{border:1px solid var(--border);color:var(--text)}
.button-secondary:hover{background:var(--surface)}
.hero-note{margin:24px 0 0;color:var(--muted);font:13px/1.5 Arial,sans-serif}
.hero-art{position:relative;display:grid;place-items:center;min-height:390px}
.art-glow{position:absolute;inset:8%;border-radius:50%;background:radial-gradient(circle,rgba(140,228,244,.18),rgba(170,136,221,.12) 48%,transparent 73%);filter:blur(35px)}
.hero-art img{position:relative;width:min(100%,400px);height:auto;border-radius:50%;box-shadow:0 15px 60px rgba(0,0,0,.25)}
.section{padding-block:88px}
.section-tinted{background:#262833;border-block:1px solid var(--border)}
h2{font-size:clamp(2.3rem,4vw,3.7rem);line-height:1.13;letter-spacing:-.035em;margin-bottom:22px}
h3{font-size:1.65rem;line-height:1.2;margin-bottom:16px}
.two-column{display:grid;grid-template-columns:.8fr 1.2fr;gap:70px}
.section-copy p,.section-intro{font-size:1.14rem;color:var(--muted);line-height:1.8}
.section-copy p{margin-bottom:18px}
.section-copy strong{color:var(--text)}
.text-link,.info-card a{font:700 14px/1.5 Arial,sans-serif;text-decoration:none}
.section-intro{max-width:730px;margin-bottom:34px}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.info-card{padding:30px;border:1px solid var(--border);border-radius:14px;background:var(--surface);display:flex;flex-direction:column;min-height:295px}
.card-number{color:var(--violet);font:700 12px/1.4 Arial,sans-serif;letter-spacing:.15em;margin-bottom:32px}
.info-card p{color:var(--muted);font-size:1.03rem;line-height:1.7;margin-bottom:25px}
.info-card a{margin-top:auto}
.portable-layout{display:grid;grid-template-columns:1fr .9fr;gap:75px;align-items:center}
.portable-layout .section-intro{margin-bottom:0}
.formula{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:34px;border:1px solid var(--border);border-radius:14px;background:var(--bg);font:700 16px/1.5 Arial,sans-serif}
.formula span,.formula strong{padding:8px 12px;border:1px solid var(--border);border-radius:7px;color:var(--text)}
.formula strong{background:var(--cyan);border-color:var(--cyan);color:var(--cyan-dark)}
.formula b{color:var(--cyan)}
.diagram-section .section-intro{max-width:810px}
.workflow-diagram{display:block;width:100%;height:auto;border:1px solid var(--border);border-radius:14px}
.final-cta{background:linear-gradient(120deg,#262a39,#30263e);border-block:1px solid var(--border)}
.final-inner{display:flex;justify-content:space-between;align-items:center;gap:45px}
.final-inner p:last-child{color:var(--muted);font-size:1.1rem;margin:0}
footer{padding-block:28px;color:var(--muted);font:13px/1.5 Arial,sans-serif}
.footer-inner,.footer-inner div{display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap}
footer a{color:var(--muted);text-decoration:none}
.auth-dialog{width:min(460px,calc(100% - 32px));max-height:min(92vh,780px);padding:30px;border:1px solid var(--border);border-radius:16px;background:var(--surface);color:var(--text);box-shadow:0 24px 90px rgba(0,0,0,.5)}
.auth-dialog::backdrop{background:rgba(7,9,17,.78)}
.auth-dialog-header{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}
.auth-dialog h2{font-size:2rem;margin:0 0 22px}
.auth-dialog .eyebrow{margin-bottom:8px}
.auth-close{border:0;background:transparent;color:var(--muted);font:32px/1 Arial,sans-serif;cursor:pointer}
.auth-dialog form{display:grid;gap:15px}
.auth-dialog label{display:grid;gap:6px;font:600 14px/1.4 Arial,sans-serif}
.auth-dialog input:not([type=checkbox]){width:100%;min-height:45px;padding:10px 12px;border:1px solid var(--border);border-radius:7px;background:var(--bg);color:var(--text);font:16px Arial,sans-serif}
.auth-dialog .auth-checkbox{display:flex;align-items:center;gap:9px;font-weight:400;color:var(--muted)}
.auth-checkbox input{width:17px;height:17px;accent-color:var(--cyan)}
.auth-dialog form .button{width:100%;margin-top:4px;border:0;cursor:pointer}
.google-button{min-height:42px;display:flex;justify-content:center}
.auth-divider{display:flex;align-items:center;gap:12px;margin:19px 0;color:var(--muted);font:13px Arial,sans-serif;text-align:center}
.auth-divider::before,.auth-divider::after{content:"";height:1px;flex:1;background:var(--border)}
.auth-links{display:flex;justify-content:space-between;gap:14px;margin-top:18px;flex-wrap:wrap}
.auth-links button{padding:0;border:0;background:none;color:var(--cyan);font:600 14px/1.4 Arial,sans-serif;cursor:pointer}
.auth-message{padding:12px;border:1px solid var(--cyan);border-radius:7px;background:rgba(140,228,244,.1);font:14px/1.5 Arial,sans-serif}
.auth-message.error{border-color:#ee939b;background:rgba(238,147,155,.1)}
.auth-help,.account-email{color:var(--muted)}
.account-name{font-size:1.3rem;font-weight:700;margin-bottom:3px}
.account-email{font:14px Arial,sans-serif;overflow-wrap:anywhere}
.auth-dialog [hidden]{display:none}
@media(max-width:820px){.hero,.two-column,.portable-layout{grid-template-columns:1fr;gap:35px}.hero{padding-block:64px;min-height:0}.hero-art{min-height:0}.hero-art img{width:min(75vw,330px)}.card-grid{grid-template-columns:1fr}.info-card{min-height:0}.final-inner{align-items:flex-start;flex-direction:column}.section{padding-block:68px}}
@media(max-width:640px){.shell{width:min(100% - 32px,1160px)}.header-inner{align-items:flex-start;flex-direction:column;padding-block:16px}nav{width:100%;overflow-x:auto;gap:22px;padding-bottom:4px;white-space:nowrap}.hero{padding-block:54px}.hero-actions{flex-direction:column}.button{width:100%}h1{font-size:3.1rem}.lede{font-size:1.12rem}.section{padding-block:54px}.formula{padding:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}
.nav-chat{border:0;background:transparent;color:var(--cyan);font:26px/1 Arial,sans-serif;cursor:pointer;padding:7px}
.nav-chat:hover{color:var(--text)}
.chat-bell{position:relative;color:var(--muted)}
.chat-bell span:not(:empty){position:absolute;top:0;right:-4px;min-width:16px;border-radius:99px;background:var(--violet);color:var(--bg);font:700 11px Arial,sans-serif;padding:2px}
.site-chat[hidden],.site-chat-form[hidden],.site-chat-guest[hidden],.site-chat-notice[hidden],.site-chat-reply[hidden],.site-chat-private[hidden],.site-chat-targets[hidden]{display:none}
.site-chat{position:fixed;z-index:50;inset:0 0 0 auto;width:min(400px,100vw);height:100dvh;display:flex;flex-direction:column;gap:9px;padding:20px;background:rgb(from var(--surface) r g b / var(--history-opacity,1));border-left:1px solid var(--border);box-shadow:-15px 0 40px #0006;color:var(--text);font:14px/1.45 Arial,sans-serif}
.site-chat h2{margin:0;font:700 24px/1.3 Arial,sans-serif;letter-spacing:0}
.site-chat-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px;border-bottom:1px solid var(--border);background:var(--surface);border-radius:12px}
.site-chat-room{margin:2px 0 0;color:var(--muted);font-size:13px}
.site-chat-close{width:36px;height:36px;border:0;border-radius:50%;background:var(--bg);color:var(--text);font:26px/1 Arial,sans-serif;cursor:pointer}
.site-chat-messages{flex:1;min-height:0;overflow:auto;display:flex;flex-direction:column;gap:12px;list-style:none;margin:0;padding:6px 0}
.site-chat-messages li{padding:10px 12px;border-radius:12px;background:rgb(from var(--bg) r g b / var(--history-opacity,1));overflow-wrap:anywhere}
.site-chat-messages li.site-chat-empty{text-align:center;color:var(--muted)}
.site-chat-messages strong{font-weight:700}.site-chat-messages time,.site-chat-messages small{margin-left:8px;color:var(--muted);font-size:11px}.site-chat-messages small{display:block;margin:4px 0 0}
.site-chat-messages p{margin:5px 0;white-space:pre-wrap}
.site-chat-reactions{display:flex;gap:6px;margin-top:8px}.site-chat-reactions button,.site-chat-reference{border:1px solid var(--border);border-radius:99px;padding:3px 7px;background:transparent;color:var(--text);font:inherit;cursor:pointer}
.site-chat-reference{display:block;max-width:100%;margin-top:7px;border:0;border-left:2px solid var(--border);border-radius:0;color:var(--muted);text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.site-chat-form,.site-chat-guest,.site-chat-notice{margin:0;padding:12px;border-radius:12px;background:var(--surface)}
.site-chat-form textarea{width:100%;box-sizing:border-box;resize:vertical;min-height:76px;padding:9px;border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text);font:inherit}
.site-chat-form textarea::placeholder{color:var(--muted)}
.site-chat-actions{display:flex;justify-content:space-between;align-items:center;margin-top:6px;color:var(--muted);font-size:12px}
.site-chat-actions button{border:0;border-radius:8px;background:var(--cyan);color:var(--cyan-dark);padding:8px 14px;font-weight:700;cursor:pointer}.site-chat-actions button:disabled{opacity:.5;cursor:not-allowed}
.site-chat-guest button{border:0;background:transparent;color:var(--cyan);font:inherit;font-weight:700;text-decoration:underline;cursor:pointer}.site-chat-notice{color:#ee939b}
.site-chat-targets{max-height:150px;overflow:auto;margin:4px 0;padding:4px;border:1px solid var(--border);border-radius:10px;list-style:none}.site-chat-targets button{width:100%;border:0;background:transparent;color:var(--text);padding:8px;text-align:left;cursor:pointer}.site-chat-targets button:hover{background:var(--border)}
.site-chat-private{display:flex;gap:7px;align-items:center;margin-top:7px;color:var(--muted)}.site-chat-private input{accent-color:var(--cyan)}
.site-chat-reply{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 8px;background:var(--surface);border-left:2px solid var(--cyan);color:var(--muted);font-size:12px}.site-chat-reply span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.site-chat-reply button{border:0;background:transparent;color:var(--text);font-size:18px;cursor:pointer}
.site-chat-options{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--surface);border-radius:12px;color:var(--muted)}.site-chat-options input{flex:1;min-width:0;accent-color:var(--muted)}
.site-chat-status{width:9px;height:9px;margin-right:auto;border-radius:50%;background:#aa8352;box-shadow:0 0 0 3px #aa835233}.site-chat-status.live{background:#58bd78;box-shadow:0 0 0 3px #58bd7833}
.site-chat-open{overflow:hidden}.site-chat .sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(max-width:640px){.site-chat{width:100vw;padding:16px}}
.legal-page{max-width:860px;padding-block:68px 96px}
.legal-page h1{font-size:clamp(2.8rem,5vw,4.5rem);margin-bottom:12px}
.legal-page h2{font-size:1.55rem;letter-spacing:0;margin:36px 0 12px}
.legal-page p{color:var(--muted);font-size:1.08rem;line-height:1.8}
.legal-page .legal-updated{font:14px/1.6 Arial,sans-serif;margin-bottom:34px}