:root{--brand-color: #176b5f;--app-height: 100dvh;font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:#17312d;background:#e8f0ed;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body,#app{width:100%;min-height:100%;margin:0}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed}body{min-height:100dvh}.chat-shell{width:min(100%,480px);min-height:var(--app-height);margin:0 auto;display:flex;flex-direction:column;background:#f6f8f7;box-shadow:0 18px 56px #11383121}.chat-header{min-height:76px;padding:calc(14px + env(safe-area-inset-top)) 18px 14px;display:flex;align-items:center;gap:12px;color:#fff;background:linear-gradient(135deg,color-mix(in srgb,var(--brand-color),#000 12%),var(--brand-color))}.brand-avatar{width:42px;height:42px;display:grid;place-items:center;flex:0 0 auto;border-radius:14px;color:var(--brand-color);background:#ddf6ed;font-weight:700}.avatar-image{object-fit:cover}.brand-copy{min-width:0;flex:1}.brand-copy h1{margin:0;font-size:18px;font-weight:650}.brand-copy p{margin:4px 0 0;display:flex;align-items:center;gap:6px;color:#ffffffc7;font-size:13px}.status-dot{width:7px;height:7px;border-radius:999px;background:#93ebbc;box-shadow:0 0 0 3px #93ebbc29}.status-dot.offline{background:#d9b1ad;box-shadow:0 0 0 3px #d9b1ad29}.transfer-button{min-height:38px;padding:0 13px;border:1px solid rgba(255,255,255,.38);border-radius:10px;color:#fff;background:#ffffff1f}.transfer-button:disabled{opacity:.45}.header-link{padding:8px;border:0;color:#ffffffe6;background:transparent;font-size:13px}.connection-banner,.fallback-banner{padding:8px 16px;color:#49635e;background:#e9f1ee;font-size:12px;text-align:center}.fallback-banner{color:#79591f;background:#fff6df}.queue-card{margin:12px 14px 0;padding:13px 14px;display:grid;grid-template-columns:1fr 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18px;display:flex;align-items:flex-start;gap:9px}.sender-visitor{justify-content:flex-end}.message-avatar{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border-radius:11px;overflow:hidden;color:var(--brand-color);background:#dceee8;font-size:12px;font-weight:700}.message-avatar img{width:100%;height:100%;object-fit:cover}.message-content{min-width:0;max-width:78%}.sender-name{display:block;margin:0 0 5px 2px;color:#69807b;font-size:12px}.message-bubble{padding:11px 14px;border-radius:5px 16px 16px;color:#253d39;background:#fff;box-shadow:0 5px 18px #1a463e12;font-size:15px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere}.message-bubble.recalled{color:#80908c;font-style:italic}.message-bubble img,.message-bubble video{display:block;width:min(260px,100%);max-height:280px;border-radius:10px;object-fit:contain}.message-bubble audio{display:block;width:min(260px,100%)}.message-bubble a{color:inherit;overflow-wrap:anywhere}.sender-visitor 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