:root{font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,SF Pro Display,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:#111827;background:#f8fafc;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body,#root{width:100%;height:100%;margin:0}body{overflow:hidden;background:#f8fafc}button,input,textarea{font:inherit}button{-webkit-tap-highlight-color:transparent}input,textarea{font-size:16px}button:disabled{opacity:.55;cursor:not-allowed}.safe-top{padding-top:env(safe-area-inset-top)}.safe-bottom{padding-bottom:env(safe-area-inset-bottom)}.muted{color:#6b7280}.primary,.secondary,.icon-btn,.send-btn,.attach-btn{border:0;cursor:pointer}.primary{min-height:44px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;background:#0284c7;color:#fff;font-weight:650}.primary.full{width:100%}.secondary{min-height:44px;padding:0 18px;border-radius:12px;background:#f3f4f6;color:#374151}.icon-btn{width:42px;height:42px;display:grid;place-items:center;background:transparent;color:#4b5563;border-radius:12px}.icon-btn:active,.attach-btn:active,.send-btn:active{transform:scale(.96)}.auth-page{min-height:100%;height:100%;display:grid;place-items:center;padding-left:18px;padding-right:18px;background:linear-gradient(145deg,#f0f9ff,#dbeafe);overflow-y:auto}.auth-card{width:min(100%,420px);padding:30px 24px;background:#fffffff5;border:1px solid rgba(255,255,255,.8);border-radius:24px;box-shadow:0 20px 60px #0f172a1f}.brand-icon{width:64px;height:64px;display:grid;place-items:center;margin:0 auto 14px;border-radius:20px;background:#0284c7;font-size:30px;box-shadow:0 8px 20px #0284c740}.auth-card h1{margin:0;text-align:center;font-size:28px}.auth-card>.muted{text-align:center;margin:8px 0 24px;font-size:14px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;background:#f3f4f6;border-radius:12px;margin-bottom:20px}.auth-tabs button{min-height:40px;border:0;border-radius:9px;background:transparent;color:#6b7280;font-weight:600}.auth-tabs button.active{background:#fff;color:#0284c7;box-shadow:0 1px 4px #00000014}.auth-form,.modal-card form{display:grid;gap:15px}label{display:grid;gap:7px;color:#374151;font-size:14px;font-weight:600}input,textarea{width:100%;border:1px solid #d1d5db;outline:none;background:#fff;color:#111827}input{min-height:46px;padding:0 14px;border-radius:12px}input:focus,textarea:focus{border-color:#38bdf8;box-shadow:0 0 0 3px #38bdf826}.error-box{padding:10px 12px;border:1px solid #fecaca;border-radius:10px;background:#fef2f2;color:#b91c1c;font-size:14px}.app-shell,.chat-shell{width:100%;height:100%;display:flex;flex-direction:column;background:#f8fafc}.topbar,.chat-header{flex:0 0 auto;background:#fffffff0;border-bottom:1px solid #e5e7eb;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}.topbar-inner{width:min(100%,760px);min-height:64px;margin:auto;padding:8px 14px;display:flex;align-items:center;justify-content:space-between}.user-summary{display:flex;align-items:center;gap:11px}.user-summary strong,.chat-person strong{display:block;font-size:16px}.user-summary span,.chat-person span{display:block;margin-top:2px;color:#9ca3af;font-size:12px}.top-actions{display:flex;gap:2px}.avatar{width:40px;height:40px;flex:0 0 auto;display:grid;place-items:center;border-radius:50%;background:linear-gradient(145deg,#38bdf8,#0284c7);color:#fff;font-weight:700}.avatar.large{width:50px;height:50px}.room-list{flex:1;width:min(100%,760px);margin:auto;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.room-row{width:100%;padding:14px;display:flex;align-items:center;gap:13px;text-align:left;border:0;border-bottom:1px solid #edf0f3;background:transparent;cursor:pointer}.room-row:active{background:#f1f5f9}.room-copy{min-width:0;flex:1}.room-title{display:flex;justify-content:space-between;gap:12px}.room-title strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.room-title time{flex:0 0 auto;color:#9ca3af;font-size:11px}.room-copy p{margin:5px 0 0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#6b7280;font-size:14px}.empty-state{min-height:60%;display:grid;place-items:center;align-content:center;gap:6px;padding:30px;text-align:center;color:#6b7280}.empty-state h2{margin:4px 0 0;color:#374151;font-size:18px}.empty-state p{margin:0 0 14px;font-size:14px}.empty-icon{font-size:44px}.notice{margin:12px 14px 0}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;display:grid;place-items:center;padding:18px;background:#0f172a80}.modal-card{width:min(100%,420px);padding:20px;border-radius:20px;background:#fff;box-shadow:0 25px 70px #0003}.modal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.modal-head h2{margin:0;font-size:19px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:4px}.chat-header{min-height:60px;display:flex;align-items:center;gap:8px;padding:7px 10px}.chat-person{flex:1;min-width:0}.chat-person .online{color:#16a34a}.back-btn{margin-left:-3px}.message-list{flex:1;min-height:0;overflow-y:auto;padding:14px max(12px,calc((100vw - 760px)/2));-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.message-row{display:flex;justify-content:flex-start;margin:0 0 9px}.message-row.mine{justify-content:flex-end}.bubble{max-width:min(78%,520px);padding:9px 12px 6px;border-radius:18px 18px 18px 5px;background:#fff;border:1px solid #e5e7eb;box-shadow:0 1px 2px #0f172a08;overflow:hidden}.bubble.mine{border:0;border-radius:18px 18px 5px;background:#0284c7;color:#fff}.bubble p{margin:0;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.45;font-size:15px}.bubble time{display:block;margin-top:4px;text-align:right;font-size:10px;color:#9ca3af}.bubble.mine time{color:#ffffffb8}.message-image,.message-video{display:block;max-width:100%;max-height:330px;margin:1px 0;border-radius:12px;object-fit:contain;background:#111827}.chat-empty{height:100%;display:grid;place-items:center;align-content:center;gap:8px;color:#9ca3af;text-align:center}.chat-empty p{margin:0;font-size:14px}.chat-notice{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 auto 10px;padding:9px 11px;width:min(100%,600px);border-radius:10px;background:#fff7ed;color:#9a3412;font-size:13px}.chat-notice button{border:0;background:transparent;color:inherit}.composer-wrap{flex:0 0 auto;width:100%;padding:7px max(10px,calc((100vw - 760px)/2)) 8px;background:#fffffff5;border-top:1px solid #e5e7eb;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}.composer{display:flex;align-items:flex-end;gap:5px;min-height:48px}.attach-btn{width:40px;height:44px;display:grid;place-items:center;color:#6b7280;border-radius:12px;position:relative}.attach-btn input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;width:100%;height:100%;cursor:pointer}.composer textarea{flex:1;min-height:44px;max-height:120px;resize:none;overflow-y:auto;padding:11px 13px;border:0;border-radius:18px;background:#f1f5f9;line-height:22px;-webkit-appearance:none}.composer textarea:focus{background:#fff}.send-btn{width:44px;height:44px;display:grid;place-items:center;flex:0 0 auto;border-radius:50%;background:#0284c7;color:#fff}.pending-media{display:flex;align-items:center;gap:10px;margin:0 0 7px;padding:7px;border-radius:12px;background:#f1f5f9}.pending-preview{width:42px;height:42px;display:grid;place-items:center;overflow:hidden;border-radius:8px;background:#e5e7eb}.pending-preview img{width:100%;height:100%;object-fit:cover}.pending-media>div:nth-child(2){min-width:0;flex:1}.pending-media strong,.pending-media span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pending-media strong{font-size:13px}.pending-media span{margin-top:2px;color:#6b7280;font-size:11px}.pending-media>button{width:34px;height:34px;border:0;border-radius:9px;background:transparent;color:#6b7280}.uploading{margin:0 0 6px;color:#0284c7;font-size:12px;text-align:center}@media (min-width: 700px){.message-list,.composer-wrap{padding-left:20px;padding-right:20px}}@media (max-width: 430px){.auth-card{padding:24px 18px;border-radius:20px}.bubble{max-width:84%}.attach-btn{width:36px}.composer{gap:2px}}