*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #f4f6f9;--card: #ffffff;--primary: #2f6fed;--primary-dark: #245fd4;--text: #1f2430;--muted: #8a92a6;--border: #e3e7ee;--danger: #d64545;--warn-bg: #fff7e6;--warn-text: #9a6b00;--err-bg: #fdecec;--err-text: #b32626}body{font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text)}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{height:52px;background:var(--card);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 20px;flex-shrink:0}.brand{font-size:18px;font-weight:700;color:var(--primary)}.topbar-right{display:flex;align-items:center;gap:12px}.me{color:var(--muted);font-size:14px}.btn{border:1px solid transparent;border-radius:8px;padding:8px 16px;font-size:14px;cursor:pointer;transition:.15s;background:none}.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark)}.btn.primary:disabled{opacity:.5;cursor:default}.btn.ghost{border-color:var(--border);color:var(--text);background:var(--card)}.btn.ghost:hover{border-color:var(--primary);color:var(--primary)}.btn.block{width:100%}.link{background:none;border:none;color:var(--primary);cursor:pointer;font-size:14px;padding:0 4px}.auth-wrap{flex:1;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{width:360px}.auth-title{font-size:22px;margin-bottom:4px}.auth-sub{color:var(--muted);font-size:14px;margin-bottom:20px}.switch-line{margin-top:14px;text-align:center;font-size:14px;color:var(--muted)}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px}.field{display:block;margin-bottom:14px}.field span{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}.field input{width:100%;border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:14px;outline:none}.field input:focus{border-color:var(--primary)}.check-line{display:flex;align-items:center;gap:8px;font-size:14px;margin-bottom:14px;cursor:pointer}.form-error{color:var(--danger);font-size:13px;margin:4px 0 12px}.hint{color:var(--muted);font-size:14px}.hint.center{text-align:center;padding:24px}.page{max-width:720px;width:100%;margin:0 auto;padding:24px 20px;flex:1}.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.room-list{list-style:none}.room-item{background:var(--card);border:1px solid var(--border);border-radius:10px;margin-bottom:10px;overflow:hidden;transition:.15s}.room-item:hover{border-color:var(--primary)}.room-main{width:100%;display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:none;border:none;cursor:pointer;font-size:15px;color:var(--text)}.room-name{display:flex;align-items:center;gap:8px;font-weight:500}.room-meta{color:var(--muted);font-size:13px}.tag{font-size:11px;padding:2px 8px;border-radius:999px}.tag.private{background:#f3e8ff;color:#7c3aed}.tag.me-tag{background:#e8f0fe;color:var(--primary);margin-left:8px}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f141e73;display:flex;align-items:center;justify-content:center;z-index:50}.modal{width:380px;max-width:calc(100vw - 40px)}.modal h3{margin-bottom:16px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:6px}.chat-layout{flex:1;display:flex;max-width:980px;width:100%;margin:0 auto;padding:16px 20px 20px;gap:16px;min-height:0}.chat-panel{flex:1;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:12px;overflow:hidden;min-height:0}.banner{padding:10px 16px;font-size:13px;display:flex;align-items:center;justify-content:space-between;gap:12px}.banner.warn{background:var(--warn-bg);color:var(--warn-text)}.banner.error{background:var(--err-bg);color:var(--err-text)}.msg-list{flex:1;overflow-y:auto;padding:16px;min-height:0}.msg{max-width:72%;margin-bottom:12px}.msg.mine{margin-left:auto}.msg-head{display:flex;gap:8px;font-size:12px;color:var(--muted);margin-bottom:4px}.msg.mine .msg-head{justify-content:flex-end}.msg-bubble{background:#eef2f8;border-radius:10px;padding:9px 12px;font-size:14px;line-height:1.5;word-break:break-word;white-space:pre-wrap}.msg.mine .msg-bubble{background:var(--primary);color:#fff}.msg.system{max-width:100%;text-align:center;margin:8px 0}.msg.system span{display:inline-block;background:var(--bg);color:var(--muted);font-size:12px;border-radius:999px;padding:3px 12px}.typing-bar{min-height:22px;padding:0 16px}.typing-text{font-size:12px;color:var(--muted)}.composer{display:flex;align-items:center;gap:10px;border-top:1px solid var(--border);padding:12px 16px}.composer input{flex:1;border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:14px;outline:none}.composer input:focus{border-color:var(--primary)}.composer input:disabled{background:var(--bg);color:var(--muted)}.char-count{font-size:12px;color:var(--muted);flex-shrink:0}.members-panel{width:200px;flex-shrink:0;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;align-self:stretch}.members-panel h3{font-size:14px;margin-bottom:12px;color:var(--muted);font-weight:500}.members-panel ul{list-style:none}.members-panel li{font-size:14px;padding:6px 4px;border-radius:6px}.members-panel li.me-row{color:var(--primary)}@media (max-width: 640px){.members-panel{display:none}}