:root{--background:#f7f7f4;--surface:#fff;--surface-strong:#f0f0eb;--sidebar:#171717;--sidebar-soft:#242424;--text:#202123;--muted:#6b6f76;--line:#deded8;--accent:#10a37f;--accent-strong:#0d8f70;--danger:#b42318;--warning:#fff4d6;--radius:8px}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--background);color:var(--text);margin:0;font-family:Arial,Helvetica,sans-serif}button,input,textarea{font:inherit}button,a{cursor:pointer}a{color:inherit;text-decoration:none}h1,h2,p{margin:0}input,textarea{border:1px solid var(--line);border-radius:var(--radius);width:100%;color:var(--text);background:#fff;outline:none;padding:12px 13px}input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #10a37f1f}button{border-radius:var(--radius);background:var(--surface-strong);color:var(--text);border:0;padding:10px 13px}button:disabled{cursor:not-allowed;opacity:.55}table{border-collapse:collapse;width:100%}th,td{border-bottom:1px solid var(--line);text-align:left;vertical-align:middle;padding:13px}th{color:var(--muted);font-size:13px;font-weight:600}.eyebrow{color:var(--accent);letter-spacing:0;text-transform:uppercase;font-size:12px;font-weight:700}.muted{color:var(--muted)}.error,.chat-error{color:var(--danger);font-size:14px}.notice{border-radius:var(--radius);background:#10a37f14;border:1px solid #10a37f59;padding:12px 14px}.primary-button,.secondary-button{justify-content:center;align-items:center;min-height:42px;font-weight:700;display:inline-flex}.primary-button{background:var(--accent);color:#fff}.primary-button:hover{background:var(--accent-strong)}.secondary-button{border:1px solid var(--line);background:#fff}.stack{gap:14px;display:grid}.stack label{gap:7px;display:grid}.stack span{color:var(--muted);font-size:13px;font-weight:600}.login-shell{place-items:center;min-height:100vh;padding:24px;display:grid}.login-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);gap:28px;width:min(430px,100%);padding:30px;display:grid;box-shadow:0 18px 55px #00000014}.login-panel h1{margin-top:8px;font-size:30px}.login-panel .muted{margin-top:8px;line-height:1.5}.chat-shell{grid-template-columns:280px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{background:var(--sidebar);color:#f4f4f0;grid-template-rows:auto 1fr auto;min-height:100vh;padding:12px;display:grid}.sidebar-top{gap:10px;display:grid}.new-chat-button,.side-link{color:#fff;background:0 0;border:1px solid #3b3b3b;justify-content:flex-start;align-items:center;width:100%;padding:12px;display:flex}.side-link{border-radius:var(--radius)}.new-chat-button:hover,.side-link:hover,.chat-item:hover{background:var(--sidebar-soft)}.chat-list{align-content:start;gap:6px;padding:18px 0;display:grid;overflow-y:auto}.chat-item{color:#f4f4f0;text-align:left;text-overflow:ellipsis;white-space:nowrap;background:0 0;width:100%;padding:11px 12px;overflow:hidden}.chat-item.active{background:var(--sidebar-soft)}.profile-box{border-top:1px solid #383838;gap:8px;padding-top:12px;display:grid}.profile-box small{color:#bdbdb7}.profile-box button{width:100%}.conversation{grid-template-rows:auto auto 1fr auto auto;min-width:0;height:100vh;display:grid}.chat-header{border-bottom:1px solid var(--line);background:#f7f7f4eb;justify-content:space-between;align-items:center;padding:18px 28px;display:flex}.chat-header h1{text-overflow:ellipsis;white-space:nowrap;margin-top:4px;font-size:20px;overflow:hidden}.access-banner{background:var(--warning);border-bottom:1px solid #ead58a;justify-content:space-between;align-items:center;gap:18px;padding:14px 28px;display:flex}.access-banner p{color:#6d5b21;margin-top:4px;font-size:14px}.inline-form{grid-template-columns:minmax(180px,260px) auto;gap:8px;display:grid}.inline-form button{color:#fff;background:#202123}.messages{align-content:start;gap:0;padding:24px 0;display:grid;overflow-y:auto}.message{grid-template-columns:44px minmax(0,760px);justify-content:center;gap:14px;padding:18px 28px;display:grid}.message.assistant{background:#f0f0eb}.avatar{color:#fff;background:#202123;border-radius:6px;place-items:center;width:36px;height:36px;font-size:12px;font-weight:700;display:grid}.assistant .avatar{background:var(--accent)}.bubble{overflow-wrap:anywhere;white-space:pre-wrap;line-height:1.65}.empty-state{text-align:center;align-content:center;place-items:center;gap:12px;min-height:50vh;padding:28px;display:grid}.empty-state h2{font-size:30px}.empty-state p{color:var(--muted)}.chat-error{padding:0 28px 10px}.composer{border-top:1px solid var(--line);background:var(--background);grid-template-columns:minmax(0,1fr) auto;gap:10px;padding:16px 28px 22px;display:grid}.composer textarea{resize:vertical;min-height:48px;max-height:180px}.composer button{background:var(--accent);color:#fff;min-width:110px;font-weight:700}.admin-shell{gap:24px;max-width:1180px;margin:0 auto;padding:28px;display:grid}.admin-header{justify-content:space-between;align-items:center;gap:20px;display:flex}.admin-header h1{margin-top:6px;font-size:30px}.admin-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.admin-card,.table-section{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:18px}.admin-card h2,.table-section h2{font-size:19px}.form-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.table-wrap{margin-top:10px;overflow-x:auto}.actions{flex-wrap:wrap;gap:8px;display:flex}.actions button{min-height:34px;padding:8px 10px}@media (max-width:820px){.chat-shell{grid-template-columns:1fr}.sidebar{min-height:auto}.conversation{height:calc(100vh - 270px);min-height:580px}.access-banner,.admin-header{flex-direction:column;align-items:stretch}.inline-form,.composer,.admin-grid,.form-row{grid-template-columns:1fr}.message{grid-template-columns:38px minmax(0,1fr);padding:16px}.chat-header,.access-banner,.composer{padding-left:16px;padding-right:16px}}