:root{color-scheme:dark;--ink:#e9efed;--muted:#94a7a4;--quiet:#657a77;--bg:#0b1114;--sidebar:#10191c;--surface:#151f22;--surface-2:#1a272a;--line:#29383a;--accent:#8ee8ce;--accent-ink:#09372f;--danger:#fb92a2;--shadow:0 24px 80px rgba(0,0,0,.24)}
*{box-sizing:border-box}html,body{min-height:100%}body{margin:0;background:radial-gradient(1200px 800px at 72% -10%,#193138 0%,transparent 54%),var(--bg);color:var(--ink);font:15px/1.5 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea,select{font:inherit}button{appearance:none;cursor:pointer;border:0}.eyebrow{margin:0 0 5px;color:var(--accent);font-size:11px;font-weight:750;letter-spacing:.11em;text-transform:uppercase}.muted{color:var(--muted)}
/* Login */.login-body{display:grid;place-items:center;padding:28px}.login-card{width:min(450px,100%);padding:42px;background:linear-gradient(145deg,rgba(25,38,42,.97),rgba(13,22,25,.97));border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}.login-card h1{margin:0;font-size:42px;letter-spacing:-.06em;line-height:1}.login-card .intro{margin:16px 0 30px;color:var(--muted);font-size:16px}.login-card label,.profile-form label{display:grid;gap:7px;margin:16px 0;color:var(--muted);font-size:13px;font-weight:650}.login-card input,.profile-form input{width:100%;padding:12px 13px;border:1px solid var(--line);border-radius:10px;background:#0c1417;color:var(--ink);outline:none}.login-card input:focus,.profile-form input:focus,textarea:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(142,232,206,.12)}.primary{background:var(--accent);color:var(--accent-ink);border-radius:10px;font-weight:800;transition:transform .15s ease,filter .15s ease}.primary:hover{filter:brightness(1.06);transform:translateY(-1px)}.login-card .primary{width:100%;padding:12px;margin-top:10px}.error{min-height:1.3em;margin:10px 0 0;color:var(--danger)}
/* App shell */.app-shell{min-height:100vh;display:grid;grid-template-columns:292px minmax(0,1fr)}.sidebar{display:flex;flex-direction:column;gap:16px;padding:24px 16px;border-right:1px solid var(--line);background:rgba(16,25,28,.88);backdrop-filter:blur(18px)}.brand{padding:4px 9px 2px}.brand h1{margin:0;font-size:29px;letter-spacing:-.06em;line-height:1.05}.brand p:last-child{margin:5px 0 0;color:var(--muted);font-size:13px}.provider-control{display:grid;gap:7px;padding:0 5px;color:var(--quiet);font-size:11px;font-weight:750;letter-spacing:.07em;text-transform:uppercase}.provider-control select{width:100%;padding:10px 11px;border:1px solid var(--line);border-radius:10px;background:#0d1619;color:var(--ink);outline:none;text-transform:none;letter-spacing:0;font-size:13px}.new-chat{padding:11px 13px;text-align:left}.conversation-label{margin:5px 9px -8px;color:var(--quiet);font-size:11px;font-weight:750;letter-spacing:.09em;text-transform:uppercase}#conversations{display:grid;align-content:start;gap:3px;min-height:0;overflow:auto;padding:3px}.conversation{display:block;width:100%;padding:10px 11px;overflow:hidden;border-radius:9px;background:transparent;color:var(--muted);font-size:14px;text-align:left;text-overflow:ellipsis;white-space:nowrap;transition:background .15s,color .15s}.conversation:hover{background:#1b292c;color:var(--ink)}.conversation.active{background:var(--surface-2);color:var(--ink);box-shadow:inset 2px 0 0 var(--accent)}.sidebar footer{display:flex;gap:7px;padding-top:8px;border-top:1px solid var(--line)}.quiet-button{flex:1;padding:8px 7px;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--muted);font-size:11px;font-weight:750;letter-spacing:.04em}.quiet-button:hover{background:#1a272a;color:var(--ink)}
.chat-main{min-width:0;min-height:100vh;display:flex;flex-direction:column}.chat-header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(22px,4vw,56px);border-bottom:1px solid rgba(41,56,58,.75)}.conversation-title{font-size:16px;font-weight:730;letter-spacing:-.015em}.mode-pill{display:inline-flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:11px;font-weight:700;letter-spacing:.04em}.mode-pill::before{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 3px rgba(142,232,206,.1);content:""}#messages{width:min(880px,100%);flex:1;margin:0 auto;padding:54px 28px 28px;overflow:auto}.empty{max-width:560px;margin:clamp(70px,16vh,180px) auto 0;text-align:center}.empty-mark{display:grid;place-items:center;width:50px;height:50px;margin:0 auto 22px;border:1px solid #41615c;border-radius:17px;background:linear-gradient(135deg,#203934,#132125);color:var(--accent);font-size:22px;font-weight:700}.empty h2{margin:0;font-size:28px;letter-spacing:-.04em;line-height:1.15}.empty p{max-width:420px;margin:13px auto 0;color:var(--muted);font-size:16px}.welcome-note{display:inline-flex;margin-top:24px;padding:8px 11px;border:1px solid var(--line);border-radius:999px;color:var(--quiet);font-size:12px}.message{max-width:720px;margin:0 0 29px;color:#dfe8e5;white-space:pre-wrap;word-break:break-word}.message .tag{margin-bottom:7px;color:var(--quiet);font-size:11px;font-weight:760;letter-spacing:.085em}.message.user{max-width:min(620px,88%);margin-left:auto;padding:13px 15px;border:1px solid #31514e;border-radius:15px 15px 4px 15px;background:linear-gradient(145deg,#18312f,#132726);color:#e5f2ed}.message.user .tag{color:#96d8c6}.message.assistant .tag{color:var(--accent)}.composer-wrap{width:min(880px,100%);margin:0 auto;padding:10px 28px 30px}.composer{display:flex;gap:10px;align-items:flex-end;padding:8px 8px 8px 15px;border:1px solid #344547;border-radius:17px;background:rgba(21,31,34,.9);box-shadow:0 9px 35px rgba(0,0,0,.18);transition:border-color .15s}.composer:focus-within{border-color:#64b6a2}.composer textarea{width:100%;min-height:43px;max-height:160px;padding:10px 0;border:0;background:transparent;color:var(--ink);outline:0;resize:none;line-height:1.45}.composer textarea::placeholder{color:#718481}.send{display:grid;place-items:center;width:42px;height:42px;padding:0;border-radius:12px;font-size:16px}.send::after{content:"↑"}.send{font-size:0}.composer-hint{margin:9px 6px 0;color:var(--quiet);font-size:11px;text-align:center}
/* Profile dialog */dialog{width:min(520px,calc(100% - 28px));padding:0;border:1px solid var(--line);border-radius:20px;background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}dialog::backdrop{background:rgba(3,7,9,.64);backdrop-filter:blur(4px)}.profile-form{padding:26px}.profile-form h2{margin:0;font-size:22px;letter-spacing:-.035em}.profile-form p{margin:8px 0 18px;color:var(--muted)}.dialog-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:22px}.secondary{padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:transparent;color:var(--muted);font-weight:700}.dialog-actions .primary{padding:10px 14px}#profile-list{padding:0 26px 22px}.profile{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-top:1px solid var(--line)}.profile small{color:var(--muted)}.profile button{padding:6px 8px;border:1px solid #6b3540;border-radius:7px;background:transparent;color:var(--danger);font-size:11px;font-weight:750}
@media(max-width:760px){.app-shell{grid-template-columns:1fr}.sidebar{gap:10px;padding:14px 13px;border-right:0;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:baseline;justify-content:space-between;padding:1px 5px}.brand h1{font-size:25px}.brand .eyebrow,.brand p:last-child{display:none}.provider-control{display:none}.new-chat{position:absolute;right:14px;top:13px;padding:8px 10px;font-size:12px}.conversation-label{display:none}#conversations{display:flex;gap:6px;overflow:auto;padding:2px 0 0}.conversation{min-width:144px;max-width:190px;padding:8px 10px;border:1px solid var(--line);background:#142023}.sidebar footer{display:none}.chat-main{min-height:calc(100vh - 122px)}.chat-header{height:56px;padding:0 17px}.conversation-title{max-width:55vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mode-pill{padding:5px 8px;font-size:10px}.mode-pill::before{width:6px;height:6px}#messages{padding:31px 17px 15px}.empty{margin-top:9vh}.empty h2{font-size:25px}.empty p{font-size:15px}.message{margin-bottom:23px}.composer-wrap{padding:8px 12px 13px}.composer{border-radius:15px}.composer-hint{display:none}.login-body{padding:17px}.login-card{min-height:0;padding:34px 29px;border-radius:21px}.login-card h1{font-size:38px}}