:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#e8e8e1;background:#0d1417;color-scheme:dark;font-synthesis:none;--teal:#86c7c5;--muted:#8d9c9e;--gold:#d4b382}
*{box-sizing:border-box;letter-spacing:0}body{margin:0}button,textarea{font:inherit}button{cursor:pointer;color:inherit}button:disabled{cursor:default}button:focus-visible,a:focus-visible{outline:2px solid var(--teal);outline-offset:4px}button{transition:background .2s,color .2s,border-color .2s}button:hover{color:#f7faf6}main{max-width:1120px;margin:auto;padding:30px 40px 24px}.page-head,.brand,.title-row,.preview-tools,.thread,.toolbar,.answer footer,.design-note,.comparison-title,.dialog-heading{display:flex;align-items:center}.page-head{justify-content:space-between}.brand{gap:10px;font-size:14px;font-weight:650}.brand img{width:24px;height:24px}.brand span,.date{font-size:11px;font-weight:450;color:var(--muted)}.date{font-variant-numeric:tabular-nums}.title-row{justify-content:space-between;margin:28px 0 24px;gap:12px}h1{font-size:26px;font-weight:550;margin:0;line-height:1.3}.prototype{font-size:11px;color:var(--muted)}.concepts{display:flex;border-bottom:1px solid #ffffff12;gap:26px}.concepts button{display:flex;align-items:center;gap:9px;padding:0 0 15px;border:0;border-bottom:2px solid transparent;margin-bottom:-1px;background:none;font-size:14px;color:#a4adae;white-space:nowrap}.concepts button>span{font-size:11px;color:#768789;font-variant-numeric:tabular-nums}.concepts button[aria-pressed=true]{color:#ecece4;border-bottom-color:#93d4ce}.concepts small{font-size:10px;font-weight:500;color:var(--gold);margin-left:3px}.preview-tools{justify-content:space-between;gap:12px;margin:20px 0}.segments{display:flex;gap:3px}.segments button{border:0;padding:7px 11px;border-radius:6px;background:none;color:#86989b;font-size:11px}.segments button[aria-pressed=true]{color:#e5ebe5;background:#ffffff0c}.stage-wrap{padding:0;min-width:0;display:flex;justify-content:center}.stage{width:100%;max-width:1040px;height:466px;display:flex;flex-direction:column;background:#0c171b;border-radius:8px;border:1px solid #ffffff08;position:relative;isolation:isolate;transition:max-width .32s ease}.stage[data-device=mobile]{max-width:390px;height:530px}.thread{align-self:flex-start;gap:9px;margin:20px 24px 0;font-size:12px;color:#8e9fa1;max-width:calc(100% - 48px);white-space:nowrap;overflow:hidden}.thread>span:last-child{overflow:hidden;text-overflow:ellipsis}.thread strong{font-weight:550;color:#d4b78d}.thread>.icon{color:#cbae7f}.thread-separator{width:1px;height:14px;background:#ffffff20;margin:0 4px;flex:none}.icon{display:inline-block;width:18px;height:18px;background:currentColor;mask:var(--icon) center/contain no-repeat;-webkit-mask:var(--icon) center/contain no-repeat;flex:none}.conversation{flex:1;min-height:0;overflow:auto;scrollbar-width:thin;scrollbar-color:#354749 transparent;width:100%;max-width:768px;padding:23px 24px 8px;margin:auto;display:flex;flex-direction:column;gap:19px;overflow-wrap:anywhere}.user-message{align-self:flex-end;padding:11px 16px;border-radius:14px 14px 4px 14px;background:linear-gradient(115deg,#ffffff04 55%,#71c6bd0c),#142024;max-width:85%;font-size:13px;border:1px solid #ffffff05;line-height:1.5}.answer{font-size:16px;line-height:1.65;color:#e4e6df}.answer p{margin:0 0 13px}.answer strong{font-weight:550;color:#cddcd5}.answer footer{flex-wrap:wrap;gap:0;font-size:10px;color:#7a9295;line-height:1.4;margin-top:18px}.answer footer>span{display:flex;align-items:center;gap:5px;padding:0 10px;position:relative;min-height:18px}.answer footer>span:first-child{padding-left:0}.answer footer>span+span:before{content:"";position:absolute;left:0;top:0;width:1px;height:100%;background:linear-gradient(transparent,#91aea536,transparent)}.answer footer .icon{width:13px;height:13px}.dock{width:100%;max-width:792px;flex:none;padding:22px 16px 22px;margin:0 auto}.composer{position:relative;padding:12px 13px 10px;isolation:isolate;transition:background .35s,border-color .35s,box-shadow .5s;border:1px solid transparent;border-radius:18px;background:#122024}.composer::before,.composer::after{content:"";position:absolute;pointer-events:none;z-index:-1;opacity:0;transition:opacity .5s;inset:-1px;border-radius:inherit}.composer textarea{display:block;width:100%;min-height:28px;height:28px;max-height:150px;resize:none;padding:1px 5px 3px;border:0;background:transparent;color:#eaf0e8;line-height:24px;font-size:16px;outline:none!important;box-shadow:none;scrollbar-width:thin;scrollbar-color:#506265 transparent}.composer textarea::placeholder{color:#94a8a7;opacity:.85}.toolbar{height:36px;gap:7px;margin-top:9px}.icon-button{width:36px;height:36px;display:inline-grid;place-items:center;background:transparent;border:0;border-radius:9px;padding:0;flex:none;color:#a4b5b3}.icon-button:hover{background:#ffffff0a}.attach .icon{width:21px;height:21px}.model{display:flex;align-items:center;gap:7px;padding:5px 7px;border:0;border-radius:6px;background:transparent;font-size:12px;min-width:0;color:#b4c4c0;white-space:nowrap}.model:hover{background:#ffffff08}.model .icon{width:16px;height:16px}.model .chevron{width:12px;height:12px;color:#708b8c;margin-left:2px}.effort{color:#7e9998;font-size:11px}.send{margin-left:auto;color:#b6c6c0;background:#ffffff08;border-radius:11px}.send:disabled{color:#6b8180;background:#ffffff04}.composer:is(:focus-within,.forced-focus) .send{color:#cde4db;background:#88bdb918}.composer .send:not(:disabled){color:#172929;background:#b0d8cc}.composer .send:not(:disabled):hover{background:#cae9dd}.send .icon{width:20px;height:20px}.attachments{display:flex;gap:6px;flex-wrap:wrap;padding:0 5px 10px}.attachments[hidden]{display:none}.file-chip{display:flex;gap:7px;align-items:center;max-width:100%;font-size:11px;color:#a9c5bf;background:#ffffff07;padding:5px 8px;border-radius:6px}.file-chip span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-chip button{border:0;background:none;font-size:16px;line-height:18px;color:#99a6a4}.file-chip .icon{width:13px;height:13px}
/* 01: an opaque surface, with one fine illuminated edge. */
[data-variant=silk] .composer{background:#132126;border-color:#799d9820;box-shadow:0 8px 22px #00000016,inset 0 1px #e4eadc04}
[data-variant=silk] .composer::before{inset:-1px 20px auto;height:1px;background:linear-gradient(90deg,transparent,#91c9bd55,#c6e8dcca,#87b8bb55,transparent);background-size:200% 100%;border-radius:0;mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent);-webkit-mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent)}
[data-variant=silk] .composer:is(:focus-within,.forced-focus){background:#15262a;border-color:#80b7b351;box-shadow:0 0 0 3px #8dccc206,0 6px 27px #00000018,inset 0 1px #bfdacf08}
[data-variant=silk] .composer:is(:focus-within,.forced-focus)::before{opacity:1;animation:silk-glide 7s ease-in-out infinite alternate}
/* 02: a low-profile matte field, defined by a single horizon. */
[data-variant=seam] .composer{background:#102024;border:0;border-radius:8px;padding:13px 14px 11px;box-shadow:none}
[data-variant=seam] .composer::after{z-index:0;inset:auto 8px 0;height:1px;opacity:.6;border-radius:0;background:linear-gradient(90deg,transparent,#698e882f 15%,#789d9944 80%,transparent)}
[data-variant=seam] .composer::before{z-index:0;inset:auto 12px 0;height:1px;border-radius:0;background:linear-gradient(90deg,transparent,#729c95,#c6e6d4,#709b98,transparent);transform:scaleX(.25);transition:opacity .45s,transform .65s cubic-bezier(.2,.7,.2,1)}
[data-variant=seam] .composer:is(:focus-within,.forced-focus){background:#14282b;box-shadow:inset 0 -14px 25px -26px #a9d6c9}
[data-variant=seam] .composer:is(:focus-within,.forced-focus)::before{opacity:.9;transform:scaleX(1);animation:horizon 5s ease-in-out infinite alternate}
[data-variant=seam] .send{border-radius:50%}
/* 03: opposing fine corners, champagne against muted teal. */
[data-variant=edge] .composer{border-radius:6px 18px 6px 18px;background:#142226;border-color:#ffffff09}
[data-variant=edge] .composer::before{inset:-1px;opacity:.45;background:linear-gradient(110deg,#b0bdae60,transparent 28%,transparent 72%,#78aead70);padding:1px;-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude}
[data-variant=edge] .composer:is(:focus-within,.forced-focus){background:#17262a;border-color:transparent;box-shadow:inset 8px 0 25px -25px #dbc19e,0 7px 22px #00000012}
[data-variant=edge] .composer:is(:focus-within,.forced-focus)::before{opacity:1;background:linear-gradient(110deg,#dbc294,transparent 33%,transparent 65%,#8dd7cf);animation:edge-light 6s ease-in-out infinite alternate}
[data-variant=edge] .composer:is(:focus-within,.forced-focus) .send:not(:disabled){background:#d9c9a8;color:#273029}
@keyframes silk-glide{from{background-position:0 50%}to{background-position:100% 50%}}@keyframes horizon{from{filter:brightness(.85)}to{filter:brightness(1.2)}}@keyframes edge-light{from{opacity:.6}to{opacity:1}}
.design-note{align-items:flex-start;gap:24px;padding:24px 0 26px}.design-note>div{display:flex;gap:8px;align-items:baseline;min-width:130px}.note-index{color:var(--gold);font-size:12px}.design-note h2{font-size:15px;font-weight:550;margin:0}.design-note p{font-size:12px;color:#9aadae;line-height:1.8;max-width:480px;margin:0}.design-note dl{display:flex;gap:18px;margin:0 0 0 auto;white-space:nowrap}.design-note dt{font-size:10px;color:#698183;margin-bottom:6px}.design-note dd{font-size:11px;margin:0;color:#b4c1bf}.comparison{padding-top:25px;border-top:1px solid #ffffff0b}.comparison-title{justify-content:space-between;gap:10px;margin-bottom:20px}.comparison-title h2{font-size:14px;font-weight:500;margin:0}.comparison-title>span{font-size:11px;color:#829796}.comparison-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.mini{min-width:0}.mini-label{font-size:11px;color:#a2b6b1;margin-bottom:15px}.mini-label span{color:#688782;padding-right:8px}.mini .composer{padding:11px 11px 8px}.mini textarea{font-size:13px;pointer-events:none;min-height:26px;height:26px}.mini .toolbar{margin-top:6px;height:30px}.mini .icon-button{height:30px;width:30px}.mini .model{font-size:11px;padding:3px;gap:5px}.mini .effort{font-size:10px}.mini .chevron{display:none}.page-footer{margin-top:32px;font-size:11px;line-height:1.6;color:#738b8d}dialog{color:#e9ede7;background:#152126;border:1px solid #bdd5cb20;border-radius:16px;padding:18px;width:min(350px,calc(100% - 32px));box-shadow:0 24px 80px #0006}dialog::backdrop{background:#060b0db8;backdrop-filter:blur(6px)}.dialog-heading{justify-content:space-between;margin-bottom:15px}.dialog-heading h2{font-size:16px;font-weight:500;margin:0}.model-option{border:0;border-radius:8px;background:#ffffff05;width:100%;padding:13px;display:flex;align-items:center;gap:12px;text-align:left;margin-top:8px}.model-option:hover{background:#97c8bd15}.model-option small{display:block;color:#8da9a3;font-size:11px;margin-top:3px}
.stage[data-device=mobile] .thread{margin:18px 16px 0;max-width:calc(100% - 32px);font-size:11px}.stage[data-device=mobile] .conversation{padding:25px 19px 8px}.stage[data-device=mobile] .answer{font-size:14px}.stage[data-device=mobile] .user-message{font-size:12px}.stage[data-device=mobile] .dock{padding:18px 12px}.stage[data-device=mobile] .composer textarea{font-size:16px}.stage[data-device=mobile] .model{font-size:11px;gap:5px}.stage[data-device=mobile] .answer footer{font-size:9px}.stage[data-device=mobile] .answer footer>span{padding:0 7px}.stage[data-device=mobile] .answer footer>span:first-child{padding-left:0}
@media(max-width:850px){main{padding:24px}.design-note{flex-wrap:wrap;gap:12px 20px}.design-note dl{width:100%;margin:4px 0 0 150px}.comparison-grid{grid-template-columns:1fr;gap:25px}.mini{max-width:600px}.mini .composer{padding:12px 14px}.mini textarea{font-size:15px}}
@media(max-width:520px){main{padding:20px 14px}.page-head .date,.prototype{display:none}.brand{font-size:13px}.brand span{font-size:10px}h1{font-size:22px}.title-row{margin:24px 0}.concepts{gap:18px}.concepts button{font-size:12px;gap:6px}.concepts small{display:none}.preview-tools{gap:6px;margin:16px 0}.segments{gap:0}.segments button{font-size:10px;padding:7px}.stage,.stage[data-device=mobile]{height:510px}.thread{margin:18px 16px 0;font-size:11px;max-width:calc(100% - 32px)}.conversation{padding:23px 18px 8px}.answer{font-size:14px}.user-message{font-size:12px}.answer footer{font-size:9px}.answer footer>span{padding:0 7px}.dock{padding:18px 12px}.composer{padding:11px 10px 9px}.model{font-size:11px;gap:5px}.design-note{padding-top:22px}.design-note>div{min-width:unset;width:100%}.design-note p{font-size:12px}.design-note dl{margin:6px 0 0;gap:25px}.comparison-title{align-items:flex-start;flex-direction:column;gap:8px}.toolbar{gap:4px}.composer textarea{font-size:16px}.mini textarea{font-size:14px}.mini .toolbar{height:34px}.mini .icon-button{width:34px;height:34px}.page-footer{font-size:10px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}