:root{--primary: #0D9488;--primary-dark: #0F766E;--primary-light: #F0FDFA;--bg: #FFFFFF;--surface: #F8FAFC;--surface-alt: #F1F5F9;--border: #E2E8F0;--border-light: #F1F5F9;--text: #0F172A;--text-secondary: #334155;--text-muted: #64748B;--text-light: #94A3B8;--radius-xl: 18px;--radius-lg: 14px;--radius-md: 10px;--radius-sm: 6px;--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .04);--shadow-sm: 0 2px 6px rgba(0, 0, 0, .06);--shadow-md: 0 6px 18px rgba(0, 0, 0, .08);--transition: .18s 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br-fade-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.br-msg-row--visitor{flex-direction:row-reverse}.br-msg-row--other{flex-direction:row}.br-msg-avatar{width:1.75rem;height:1.75rem;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:700;flex-shrink:0;margin-bottom:2px}.br-msg-avatar--agent{background:var(--primary);color:#fff}.br-msg-avatar--bot{background:#fff;border:1px solid var(--border);font-size:.95rem}.br-msg-col{display:flex;flex-direction:column;max-width:78%}.br-msg-row--visitor .br-msg-col{align-items:flex-end}.br-msg-row--other .br-msg-col{align-items:flex-start}.br-msg-sender{font-size:.68rem;font-weight:600;color:var(--text-muted);margin-bottom:.2rem;padding:0 .15rem;letter-spacing:.02em}.br-bubble{padding:.6rem 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#0d94881f}.br-textarea:disabled{opacity:.6;cursor:not-allowed}.br-textarea::placeholder{color:var(--text-light)}.br-send-btn{all:unset;cursor:pointer;width:2.25rem;height:2.25rem;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:transform var(--transition),background-color var(--transition),opacity var(--transition)}.br-send-btn:hover:not(:disabled){background:var(--primary-dark);transform:scale(1.06)}.br-send-btn:disabled{opacity:.35;cursor:not-allowed;transform:none}.br-send-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.br-powered{text-align:center;padding:.25rem;font-size:.65rem;color:var(--text-light);background:#fff;flex-shrink:0;border-top:1px solid var(--border-light)}.br-powered a{color:var(--primary);text-decoration:none;font-weight:600}.br-powered a:hover{text-decoration:underline}@media (max-width: 480px){.br-header{padding:.75rem .875rem}.br-message-list{padding:.75rem .65rem}.br-input-bar{padding:.6rem .75rem}.br-msg-col{max-width:82%}}