:root{color-scheme:dark;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#e8e8e3;background:#0d1012;--accent:#9aede3;--muted:#858c8e}
*{box-sizing:border-box;letter-spacing:0}body{margin:0}button,a,summary{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;color:inherit}button{border:0;background:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}a{color:inherit}.study-header{max-width:1100px;margin:auto;padding:24px 28px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid #24292c}.brand{display:flex;gap:10px;align-items:center;text-decoration:none;font-size:12px;font-weight:750}.brand img{width:23px;height:23px}.brand span{font-size:10px;color:#778182;font-weight:450}.mock-label{font-size:11px;color:#858c8e}main{max-width:1100px;margin:auto;padding:30px 28px 0}.direction-title{display:flex;align-items:center;justify-content:space-between;gap:20px}h1{font-size:24px;line-height:1.25;margin:0;font-weight:650}.original-button{font-size:12px;color:#9ba6a6;padding:8px 0;white-space:nowrap}.original-button span{margin-left:5px;color:var(--accent)}.variants{display:flex;gap:4px;margin-top:24px;border-bottom:1px solid #2b3032}.variants button{display:flex;align-items:center;gap:10px;min-height:46px;padding:8px 22px;border-bottom:2px solid transparent;color:#818a8d;font-size:15px;font-weight:600}.variants button>span{font-size:11px;font-variant-numeric:tabular-nums}.variants button[aria-pressed=true]{color:#f0f4ef;border-bottom-color:var(--accent);background:linear-gradient(transparent,#a0efe307)}.variants small{font-size:9px;color:#9aede3;font-weight:500}.direction-note{display:flex;gap:28px;align-items:center;justify-content:space-between;min-height:70px;padding:13px 0}.direction-note p{margin:0;color:#9ba3a2;font-size:13px;line-height:1.5;max-width:670px}.devices{display:flex;gap:4px;flex:none;background:#1a1e20;border-radius:5px;padding:3px}.devices button{font-size:11px;padding:7px 9px;border-radius:3px;color:#878f91}.devices button[aria-pressed=true]{background:#333b3e;color:#eff2ec}.preview{max-width:720px;margin:30px auto 58px;min-width:0}.preview.mobile{max-width:390px}.history-row{padding-left:10px;margin-bottom:25px}.history-control{display:inline-flex;align-items:center;gap:8px;min-height:34px;padding:3px 0;font-size:12px;font-weight:550;color:#899696;border-radius:0;transition:color .18s}.history-control:hover{color:#e5f3ef}.icon{display:inline-block;flex:none;width:13px;height:13px;background:currentColor;mask:var(--icon) center/contain no-repeat;-webkit-mask:var(--icon) center/contain no-repeat}.up{--icon:url('/message-design-20260915/assets/arrow-up.svg')}.chevron{--icon:url('/message-design-20260915/assets/chevron-right.svg');transition:transform .2s}.copy-icon{--icon:url('copy.svg')}.history-count{font-size:11px;color:#b8c8c4;font-variant-numeric:tabular-nums}.user{display:flex;flex-direction:column;align-items:flex-end}.bubble{width:fit-content;max-width:min(100%,600px);background:linear-gradient(105deg,#202426 48%,#273537);border-radius:22px;padding:17px 20px;color:#ecebe6;font-size:16px;line-height:1.65}.bubble p{margin:0}.bubble p+p{margin-top:19px}.user-footer{display:flex;align-items:center;gap:10px;padding:7px 4px 0;font-size:10px;color:#717777}.copy{width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;color:#717c7d;border-radius:5px}.copy:hover{background:#ffffff07;color:#cedbd6}.copy[data-copied=true]{color:#9cd4aa}.assistant{margin-top:24px}.reasoning{margin-bottom:14px}.reasoning summary{width:fit-content;max-width:100%;display:flex;align-items:center;gap:8px;min-height:34px;padding:3px 0;list-style:none;cursor:pointer;user-select:none;transition:color .18s,background .18s;color:#c7d2ce}.reasoning summary::-webkit-details-marker{display:none}.reasoning[open] .chevron{transform:rotate(90deg)}.reason-label{font-size:12px;font-weight:650}.reason-count{font-size:11px;font-variant-numeric:tabular-nums;line-height:20px;min-width:20px;text-align:center}.reasoning-content{max-width:650px;margin:14px 0 22px;padding:0 0 0 12px;border-left:1px solid #ffffff13;animation:reveal .2s ease-out}.reasoning-content ol{list-style:none;margin:0;padding:0}.reasoning-content li{padding:9px 0}.reasoning-content p{color:#a0aaa8;font-size:13px;line-height:1.7;margin:0 0 5px}.reasoning-content time,.sample-note{font-size:10px;color:#6e7a7b}.sample-note{display:block;margin-top:8px}.answer{font-size:16px;line-height:1.8;color:#e5e6e0}.answer p{margin:0 0 17px}.answer p:last-child{margin-bottom:0}.answer ul{margin:0 0 17px;padding-left:24px}.answer li{padding-left:2px;margin:4px 0}.answer a{color:#edbe83;text-decoration:none}.answer a:hover{text-decoration:underline}.answer code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:14px;background:#242628;border-radius:4px;padding:2px 5px;color:#e1e3dd}.answer-footer{display:flex;align-items:center;flex-wrap:wrap;margin-top:6px;color:#808c89;font-size:10px;min-height:28px;gap:0}.answer-footer>*{position:relative;padding:0 9px;min-height:28px;display:inline-flex;align-items:center;gap:5px}.answer-footer>*:not(:last-child)::after{content:'';position:absolute;right:0;top:3px;width:1px;height:19px;background:linear-gradient(#ffffff16,transparent)}.answer-footer .model img{width:13px;height:13px;opacity:.7}.answer-footer .copy{padding:0;width:28px}.rationale{display:grid;grid-template-columns:150px 1fr;gap:30px;border-top:1px solid #252b2d;padding:24px 0 40px;max-width:900px;margin:auto}.section-number{font-size:10px;color:#738481}.rationale h2{font-size:16px;font-weight:600;margin:0 0 8px}.rationale p{color:#8b9697;font-size:13px;line-height:1.7;margin:0;max-width:610px}#older{margin:0 10px 24px;padding:0 0 16px;border-bottom:1px solid #ffffff0b;font-size:13px;line-height:1.7;color:#9da8a7}#older[hidden]{display:none}#older p{margin:0 0 10px;color:#d2dad6}#older small{display:block;color:#6f7b7b;font-size:10px;margin-top:6px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,6px);background:#272e30;color:#e1e8e1;border-radius:6px;padding:9px 16px;font-size:12px;opacity:0;pointer-events:none;transition:opacity .18s,transform .18s;z-index:3}.toast.visible{opacity:1;transform:translate(-50%,0)}dialog{background:#121618;padding:40px 12px 12px;border:1px solid #363c3d;border-radius:8px;max-width:min(1000px,95vw);max-height:94dvh}dialog::backdrop{background:#000b}dialog .reference{display:block;max-width:100%;max-height:80dvh;object-fit:contain}#original-close{position:absolute;right:10px;top:6px;width:30px;height:30px;display:grid;place-items:center}#original-close img{width:16px;height:16px}
/* Same hierarchy, three intentionally different control treatments. */
.answer-footer .model img{filter:invert(1)}
body[data-variant='1'] .slash{height:16px;width:3px;background:var(--accent);transform:skew(-18deg);margin:0 5px}
body[data-variant='1'] .reason-label{text-transform:uppercase;font-size:11px;font-weight:750;color:#e3ece7}
body[data-variant='1'] .reason-count{color:var(--accent);font-size:12px;font-weight:700}
body[data-variant='1'] .reasoning summary:hover .reason-label{color:var(--accent)}
body[data-variant='1'] .history-control{gap:7px;font-size:11px;text-transform:uppercase;font-weight:650}
body[data-variant='1'] .history-count{border-left:1px solid #435450;padding-left:7px;line-height:12px;color:var(--accent)}
body[data-variant='2'] .reasoning summary{gap:0;padding:0;min-height:32px}
body[data-variant='2'] .reason-label{order:1;text-transform:uppercase;font-size:11px;font-weight:750;color:#dae7e2;padding:0 10px}
body[data-variant='2'] .reason-count{order:0;color:#101b1c;background:#a0e9df;min-width:28px;line-height:28px;border-radius:3px;font-weight:800;font-size:12px;transition:background .18s}
body[data-variant='2'] .chevron{order:2;width:12px;color:#8ca6a1}
body[data-variant='2'] summary:hover .reason-count{background:#d3fff5}
body[data-variant='2'] .history-control{color:#909c9b;gap:7px}
body[data-variant='2'] .history-count{color:#d9e5df;min-width:17px;line-height:17px;border:1px solid #40534f;border-radius:3px;font-size:10px}
body[data-variant='3'] .reason-label{font-size:13px;font-weight:600;color:#d2dbd8}
body[data-variant='3'] .reason-count{font-size:10px;min-width:auto;line-height:1;color:#778b85;align-self:flex-start;margin-top:6px}
body[data-variant='3'] .chevron{color:#a0e9df;width:12px;margin-left:4px}
body[data-variant='3'] summary:hover .reason-label{color:white}
body[data-variant='3'] .history-control{color:#84908e;font-weight:450;font-size:12px;gap:6px}
body[data-variant='3'] .history-count{font-size:10px;opacity:.7}
@keyframes reveal{from{opacity:0;transform:translateY(-3px)}to{opacity:1;transform:none}}
@media(max-width:650px){.study-header{padding:18px 16px}.brand span{display:none}main{padding:24px 16px 0}h1{font-size:21px;max-width:260px}.direction-title{align-items:flex-start;gap:8px}.original-button{font-size:10px;white-space:normal;max-width:83px;text-align:right;padding-top:3px}.variants{margin-top:20px}.variants button{flex:1;justify-content:center;gap:6px;font-size:13px;padding:8px 4px;min-height:44px}.variants small{display:none}.direction-note{gap:12px;flex-wrap:wrap;padding-top:15px}.direction-note p{font-size:12px}.devices{margin-left:auto}.preview{margin-top:22px;margin-bottom:34px}.bubble{padding:15px 17px;border-radius:20px;font-size:15px}.bubble p+p{margin-top:17px}.answer{font-size:15px;line-height:1.8}.answer code{font-size:13px}.rationale{grid-template-columns:1fr;gap:12px;padding:20px 0 30px}.rationale h2{font-size:15px}.rationale p{font-size:12px}.history-row{padding-left:6px;margin-bottom:19px}.reasoning summary{min-height:36px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}