.chat-shell{background:#141720;border:1px solid #2b2d3c;border-radius:22px;overflow:hidden}.chat-top{display:flex;align-items:center;justify-content:space-between;padding:24px 28px 10px;gap:20px}.chat-top h2{margin:9px 0}.engine-badge{padding:9px 12px;border:1px solid #3d3c58;border-radius:30px;font-size:12px;color:#bdb4ef;white-space:nowrap}.chat-toolbar{display:flex;align-items:center;gap:12px;padding:10px 28px;color:#9ba0b3;font-size:12px;flex-wrap:wrap}.chat-toolbar span{flex:1}.chat-toolbar button{font-size:12px;min-height:36px}.chat-feed{height:52vh;min-height:300px;max-height:850px;overflow-y:auto;padding:20px 28px;scrollbar-color:#4f466c #141720}.chat-message{margin:0 0 22px;padding:18px 20px;max-width:92%;background:#1c2030;border:1px solid #31354a;border-radius:16px;overflow-wrap:anywhere}.chat-message.user{margin-left:auto;background:#26213a;border-color:#494164}.chat-author{display:flex;gap:12px;align-items:center;margin-bottom:10px}.chat-author strong{font-size:14px}.chat-author small,.chat-message>small{color:#a9adbe;font-size:11px}.chat-body{white-space:pre-wrap;line-height:1.65;font-size:15px}.chat-message details{font-size:12px;color:#a9adbe;margin:12px 0}.chat-message details p{font-size:12px}.chat-welcome{text-align:center;padding:30px 20px;color:#adb1c4;max-width:550px;margin:auto}.welcome-mark{display:inline-flex;width:62px;height:62px;background:#bba4f7;color:#171322;align-items:center;justify-content:center;border-radius:18px;font-size:38px;font-weight:800}.chat-welcome h3{font-size:25px;color:#f5f2fb}#chat-form{padding:15px 22px;background:#191c28;border-top:1px solid #303243}#chat-text{min-height:80px;resize:vertical;border:0;background:#11141e;font-size:15px;margin:0}.composer-actions{display:flex;align-items:center;gap:12px;margin-top:10px}.composer-actions span{flex:1;text-align:center;font-size:11px;color:#9aa0b5}.file-button{cursor:pointer;display:inline-flex;align-items:center;border:1px solid #484258;border-radius:10px;padding:12px;white-space:nowrap;font-size:13px}.file-button input{display:none}.attached-files{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}.attached-files button{font-size:12px;max-width:100%;overflow-wrap:anywhere}.chat-hints{display:flex;gap:8px;padding:16px 22px 0;flex-wrap:wrap}.chat-hints button{font-size:11px;padding:8px 10px;min-height:34px}.chat-shell>.footnote{padding:0 22px 14px}.sr-label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}#evolution>.card{margin:20px 0}.check{display:flex;align-items:center;gap:12px}.check input{width:18px;height:18px}.upload-row{padding:16px 0;display:flex;flex-direction:column;gap:8px;border-bottom:1px solid #303244;overflow-wrap:anywhere}#preferences>.card{margin-bottom:20px}@media(max-width:950px){.chat-top{align-items:flex-start;flex-direction:column;gap:8px}.chat-message{max-width:100%}}@media(max-width:720px){.chat-top{padding:20px 16px 6px}.chat-toolbar{padding:8px 16px}.chat-feed{padding:16px 12px;height:48vh}.chat-message{padding:14px}.composer-actions{flex-wrap:wrap}.composer-actions span{display:none}.composer-actions button{margin-left:auto}.chat-hints{padding:12px}.engine-badge{white-space:normal}#chat-form{padding:12px}.chat-body{font-size:14px}main header h1{font-size:26px}}
.chat-shell{min-width:0}
/* Compact workspace; mobile keeps 44px touch targets and readable input text. */
:root{--bg:#141416;--panel:#1c1c20;--line:#303036;--text:#eeeef1;--muted:#aaa7b0;--accent:#beb6f5;--green:#9ed7be}
body{font-size:14px}
aside{width:204px;padding:24px 14px;background:#18181b}
.brand{gap:10px;font-size:18px;letter-spacing:2px}.mark{width:34px;height:34px;border-radius:9px;font-size:23px}
nav{gap:4px;margin-top:30px}.nav{padding:9px 12px;font-size:13px;border-radius:7px}
main{margin-left:204px;max-width:1390px;padding:24px 32px}
h1{font-size:clamp(24px,2.4vw,30px);margin:8px 0;letter-spacing:-.7px}h2{font-size:20px}
button{padding:8px 12px;border-radius:8px}button:focus-visible,a:focus-visible,.file-button:focus-within{outline:2px solid var(--accent);outline-offset:3px}
.card{padding:22px;margin:22px 0;border-radius:12px}.metrics{gap:12px;margin:22px 0}.metrics article{padding:17px;border-radius:11px}.metrics strong{font-size:32px}
.chat-shell{background:#18181b;border-color:var(--line);border-radius:14px}
.chat-top{padding:16px 20px 6px;gap:16px}.chat-top h2{margin:5px 0;font-size:18px;font-weight:600}
.engine-badge{padding:5px 9px;border-color:#3a3748;font-size:11px;color:#c5beda;max-width:100%;overflow-wrap:anywhere}
.chat-toolbar{gap:8px;padding:7px 20px;font-size:11px;border-bottom:1px solid #26262c}.chat-toolbar button{font-size:11px;min-height:32px;padding:5px 8px}
.chat-feed{height:52vh;height:52dvh;min-height:260px;padding:22px max(20px,calc((100% - 820px)/2));overscroll-behavior:contain;scrollbar-color:#4c485b #18181b;scrollbar-width:thin}
.chat-message{padding:5px 0;max-width:100%;border:0;background:transparent;border-radius:12px;min-width:0}
.chat-message.user{max-width:87%;padding:12px 15px;background:#29272f;border:1px solid #37343f}
.chat-author{gap:10px;flex-wrap:wrap;margin-bottom:7px}.chat-author strong{font-size:12px;font-weight:650}.chat-author small,.chat-message>small{color:#aaa6b3;font-size:10px}
.chat-body{line-height:1.7;font-size:14px;tab-size:2}.chat-message details{font-size:11px;margin:10px 0}.chat-message details summary{cursor:pointer;padding:5px 0}
.chat-welcome{padding:26px 16px;max-width:520px}.welcome-mark{width:43px;height:43px;border-radius:12px;font-size:28px;background:var(--accent)}.chat-welcome h3{font-size:23px;font-weight:550;letter-spacing:-.5px;margin:16px 0 8px}.chat-welcome p{font-size:13px}
#chat-form{padding:12px 16px;background:#202023;border-top-color:#323238}
#chat-text{min-height:64px;max-height:240px;background:#202023;font-family:inherit;font-size:14px;line-height:1.55;padding:8px 5px;border:1px solid transparent;border-radius:6px}
#chat-text:focus{border-color:#70677f}#chat-text::placeholder{color:#aaa6b0;opacity:1}
.composer-actions{gap:10px;margin-top:7px}.composer-actions span{font-size:10px;color:#aaa6b3}
.file-button{padding:8px 10px;font-size:12px;margin:0;min-height:36px;color:#d2cedb;border-color:#45424d;border-radius:8px}#send-chat{min-height:36px;font-size:12px;padding:8px 13px}
.attached-files:empty{display:none}.attached-files button{font-size:11px;text-align:left}
.chat-hints{gap:6px;padding:10px 16px 0}.chat-hints button{font-size:11px;padding:6px 8px;min-height:30px;border-color:#36333e;color:#bbb5c9}
.chat-shell>.footnote{padding:0 16px 12px;margin:10px 0 0;font-size:10px;color:#aaa6b2;line-height:1.55}
@media(max-width:1050px){aside{width:180px;padding:22px 12px}main{margin-left:180px;padding:22px}.chat-top{flex-wrap:wrap;gap:7px}.chat-feed{padding:18px}}
@media(max-width:720px){
aside{position:static;width:100%;padding:12px 12px 0;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:16px}.mark{width:29px;height:29px;font-size:20px}.brand small{font-size:10px}
nav{display:flex;gap:3px;margin-top:8px;overflow-x:auto;padding-bottom:6px;scrollbar-width:thin}.nav{font-size:12px;padding:8px 11px;min-height:44px;flex-shrink:0}
main{margin:0;padding:14px 10px 20px;padding-bottom:max(20px,env(safe-area-inset-bottom))}main header h1{font-size:24px}header p{font-size:12px;margin:6px 0 12px}
.chat-shell{border-radius:11px}.chat-top{padding:12px 12px 5px}.chat-top h2{font-size:17px}.chat-top .tag{font-size:9px}.engine-badge{font-size:10px;padding:4px 8px;white-space:normal}
.chat-toolbar{padding:6px 10px;gap:6px}.chat-toolbar button{min-height:44px;font-size:10px}.chat-toolbar span{min-width:0;font-size:10px}
.chat-feed{padding:16px 12px;height:46vh;height:46dvh;min-height:220px;max-height:none}.chat-message{margin-bottom:20px}.chat-message.user{max-width:93%;padding:10px 12px}.chat-body{font-size:14px;line-height:1.65}
#chat-form{padding:9px 10px}#chat-text{font-size:16px;min-height:62px;max-height:180px}.composer-actions{gap:8px;flex-wrap:wrap}.composer-actions span{display:none}.composer-actions button{margin-left:auto}.file-button,#send-chat{min-height:44px;font-size:12px;padding:9px 11px}
.chat-hints{padding:8px 10px 0;gap:5px}.chat-hints button{min-height:44px;font-size:10px;padding:7px 9px}.chat-shell>.footnote{padding:0 10px 10px;font-size:10px}
.chat-welcome{padding:20px 10px}.chat-welcome h3{font-size:21px}.metrics{margin:16px 0}.metrics article{padding:14px}.metrics strong{font-size:28px}.card{padding:17px;border-radius:11px}
input,textarea,select{font-size:16px}.section-heading select{font-size:16px}
}
@media(max-width:370px){.chat-toolbar span{flex-basis:100%;order:3}.chat-toolbar button{flex:1}.file-button,#send-chat{padding:8px}.chat-body{font-size:13px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}