:root{color:#1f2937;background:#e9edf2;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,Roboto,Arial,sans-serif}*{box-sizing:border-box}body{background:#e9edf2;min-width:320px;min-height:100vh;margin:0}button,input,textarea{font:inherit}.chat-app{background:#fff;flex-direction:column;width:min(100%,960px);height:100dvh;margin:0 auto;display:flex;overflow:hidden;box-shadow:0 0 0 1px #18273a0a,0 18px 48px #18273a14}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.chat-body{scrollbar-gutter:stable;background:#f4f6f8;flex:1;min-height:0;padding:28px 32px 32px;overflow-y:auto}.chat-message-list{width:min(100%,820px);margin:0 auto}.chat-empty{color:#9aa5b1;text-align:center;padding:72px 20px;font-size:14px}.chat-msg{flex-direction:column;margin-bottom:18px;display:flex}.chat-msg.member{align-items:flex-end}.chat-msg.admin{align-items:flex-start}.chat-bubble{word-break:break-word;border-radius:14px;max-width:min(75%,560px);padding:11px 15px;font-size:14px;line-height:1.65;box-shadow:0 1px 2px #18273a0a}.chat-msg.member .chat-bubble{color:#fff;background:#1683d8;border-bottom-right-radius:5px}.chat-msg.admin .chat-bubble{color:#253448;background:#fff;border-bottom-left-radius:5px}.chat-time{color:#a4afb9;margin-top:4px;padding:0 4px;font-size:11px}.chat-media{border-radius:8px;max-width:100%;max-height:280px;display:block}.chat-video{border-radius:8px;max-width:100%;max-height:200px;display:block}.chat-emoji-large{font-size:32px}.chat-footer{padding:14px 32px calc(16px + env(safe-area-inset-bottom));background:#fff;border-top:1px solid #e2e7ec;flex-shrink:0}.composer-inner{width:min(100%,820px);margin:0 auto}.emoji-bar{background:#fff;border:1px solid #e2e7ec;border-radius:10px;flex-wrap:wrap;gap:6px;max-height:144px;margin-bottom:10px;padding:10px;display:flex;overflow-y:auto;box-shadow:0 8px 20px #18273a14}.emoji-bar button{cursor:pointer;background:0 0;border:0;border-radius:8px;min-width:36px;min-height:36px;padding:2px 6px;font-size:22px}.emoji-bar button:hover{background:#f1f6fb}.file-preview{color:#506274;background:#f3f7fb;border:1px solid #dceaf5;border-radius:8px;justify-content:space-between;align-items:center;gap:12px;min-height:34px;margin-bottom:10px;padding:6px 10px;font-size:12px;display:flex}.file-preview-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.clear-file-btn{color:#7b8a99;cursor:pointer;background:0 0;border:0;border-radius:6px;flex:none;width:24px;height:24px}.clear-file-btn:hover{color:#d14b4b;background:#fff}.chat-toolbar{align-items:center;gap:8px;margin-bottom:9px;display:flex}.tool-btn{color:#617386;cursor:pointer;background:0 0;border:1px solid #d8e0e8;border-radius:8px;justify-content:center;align-items:center;width:34px;height:34px;transition:border-color .16s,color .16s,background-color .16s,transform .16s;display:inline-flex}.tool-btn:hover,.tool-btn:focus-visible{color:#1683d8;background:#f2f8fd;border-color:#1683d8;outline:none;transform:translateY(-1px)}.tool-btn svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.65px;width:17px;height:17px}.file-btn input{display:none}.chat-input-row{align-items:flex-end;gap:10px;display:flex}.chat-input-row textarea{color:#253448;resize:none;background:#fff;border:1px solid #d8e0e8;border-radius:10px;flex:1;min-width:0;min-height:42px;max-height:100px;padding:10px 13px;font-family:inherit;font-size:14px;line-height:1.5;transition:border-color .16s,box-shadow .16s}.chat-input-row textarea:focus{border-color:#1683d8;outline:none;box-shadow:0 0 0 3px #1683d81f}.send-btn{color:#fff;cursor:pointer;background:#1683d8;border:0;border-radius:10px;flex:none;min-width:68px;height:42px;padding:0 18px;font-size:14px;font-weight:600;transition:background-color .16s,transform .16s,box-shadow .16s}.send-btn:hover{background:#0d70be;transform:translateY(-1px);box-shadow:0 5px 12px #1683d833}.send-btn:disabled{cursor:not-allowed;box-shadow:none;background:#b8c4cf;transform:none}@media (width<=480px){.chat-app{max-width:100%;box-shadow:none}.chat-body{padding:20px 16px 24px}.chat-bubble{max-width:88%}.chat-footer{padding:10px 12px calc(12px + env(safe-area-inset-bottom))}.chat-input-row{gap:8px}.send-btn{min-width:62px;padding:0 14px}}@media (width>=481px){body{padding:16px 0}.chat-app{border-radius:12px;height:calc(100dvh - 32px)}}