:root{--brand:#2563eb;--bg:#f3f6fb;--text:#14213d;--muted:#6b7891;--line:#dfe6f1;--card:#fff;--danger:#dc2626}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:var(--bg)}input,textarea,select,button{font:inherit}a{color:inherit}.brand{font-weight:900;letter-spacing:-.03em;font-size:20px}.brand span{color:#2563eb}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:11px 16px;text-decoration:none;cursor:pointer;font-weight:700}.btn.primary{background:#2563eb;border-color:#2563eb;color:#fff}.btn.danger{color:#dc2626;border-color:#fecaca}.btn.small{padding:7px 10px;font-size:12px;border-radius:9px}.notice{padding:12px 14px;border-radius:12px;margin:12px 0}.notice.success{background:#ecfdf5;color:#047857}.notice.danger{background:#fef2f2;color:#b91c1c}.install-body,.login-body{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,#eef4ff,#f7f9fc)}.install-card,.login-card{width:min(820px,100%);background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:0 25px 70px #1d4ed81a}.login-card{width:min(430px,100%)}h1{font-size:34px;letter-spacing:-.04em;margin:8px 0}h2{font-size:18px;margin:12px 0}.grid-form{display:grid;grid-template-columns:1fr 1fr;gap:14px}.grid-form h2{grid-column:1/-1;border-top:1px solid var(--line);padding-top:18px}.grid-form .btn{grid-column:1/-1}label{display:grid;gap:7px;font-weight:700;font-size:13px}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:11px;padding:11px 12px;background:#fff;color:var(--text);outline:none}input:focus,textarea:focus,select:focus{border-color:#2563eb;box-shadow:0 0 0 3px #2563eb18}.login-card form,.stack{display:grid;gap:14px}.chat-page{background:linear-gradient(145deg,color-mix(in srgb,var(--brand) 8%,#fff),#f7f9fc);min-height:100vh}.standalone-chat{min-height:100vh;display:grid;place-items:center;padding:20px}.chat-shell{width:min(460px,100%);height:min(760px,calc(100vh - 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