:root{--bg:#f5f7fb;--panel:#ffffff;--muted:#6b7280;--text:#111827;--primary:#10b981;--accent:#3b82f6;--border:#e5e7eb;--me:#dcfce7;--them:#ffffff}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font:14px/1.4 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}.app{height:100%;display:flex;gap:0.75rem;padding:0.75rem}.sidebar{width:320px;max-width:100%;background:var(--panel);border-radius:16px;box-shadow:0 6px 16px rgba(0,0,0,.06);display:flex;flex-direction:column;overflow:hidden;border:1px solid var(--border)}.sb-header{padding:14px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px}.avatar{width:28px;height:28px;border-radius:50%;background:#ddd}.me-name{font-weight:600}.search{padding:10px 14px;border-bottom:1px solid var(--border)}.search input{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:12px;background:#f9fafb;outline:none}.contacts{overflow:auto}.contact{display:flex;gap:10px;padding:12px 14px;cursor:pointer;border-bottom:1px solid #f3f4f6;align-items:center}.contact:hover{background:#f9fafb}.c-av{width:40px;height:40px;border-radius:12px;background:#e5e7eb;position:relative;flex:0 0 auto}.dot{position:absolute;right:-2px;bottom:-2px;width:12px;height:12px;border-radius:50%;border:2px solid #fff;background:#9ca3af}.dot.online{background:#10b981}.c-meta{flex:1;min-width:0}.c-row1{display:flex;justify-content:space-between;gap:8px}.c-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.c-time{color:var(--muted);font-size:12px}.c-preview{color:#374151;opacity:.9;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}.badge{background:var(--accent);color:#fff;border-radius:999px;padding:0 6px;font-size:12px;margin-left:6px;height:19.05px;line-height:19.05px}.chat{flex:1;background:var(--panel);border-radius:16px;box-shadow:0 6px 16px rgba(0,0,0,.06);display:flex;flex-direction:column;overflow:hidden;border:1px solid var(--border)}.chat-header{padding:12px 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px}.ch-title{font-weight:700}.ch-sub{color:var(--muted);font-size:12px}.chat-body{flex:1;overflow:auto;padding:18px;background:linear-gradient(#fafafa,#fff)}.day-sep{display:flex;align-items:center;gap:12px;margin:10px 0;color:#6b7280}.day-sep::before,.day-sep::after{content:"";height:1px;background:#e5e7eb;flex:1}.msg{max-width:calc(100% - 5px);display:flex;gap:8px;margin:10px 0}.msg .bubble{padding:10px 12px;border-radius:14px;border:1px solid var(--border);box-shadow:0 1px 0 rgba(0,0,0,.02)}.msg.them{flex-direction:row}.msg.them .bubble{background:var(--them)}.msg.me{margin-left:auto;flex-direction:row-reverse}.msg.me .bubble{background:var(--me);border-color:#bbf7d0}.msg .meta{font-size:11px;color:#6b7280;margin-top:4px}.chat-input{border-top:1px solid var(--border);padding:10px;background:#fafafa;display:flex;gap:8px;align-items:center}.chat-input textarea{flex:1;resize:none;min-height:44px;max-height:160px;padding:10px 12px;border:1px solid var(--border);border-radius:12px;background:#fff;outline:none}.btn{border:1px solid var(--border);background:var(--accent);color:#fff;border-radius:12px;padding:10px 14px;cursor:pointer;font-weight:600}.btn:disabled{opacity:.6;cursor:not-allowed}.iconbtn{border:1px solid var(--border);background:#fff;border-radius:10px;padding:10px;cursor:pointer}.back{display:none;margin-right:8px;border:1px solid var(--border);background:#fff;border-radius:10px;padding:8px 10px;cursor:pointer}@media (max-width:900px){.app{padding:0;gap:0}.sidebar{display:block;width:100%;border-radius:0}.chat{display:none;position:fixed;inset:0;border-radius:0;display:none}.chat.show{display:flex}.back{display:inline-flex}}.avatar img{width:100%;height:100%;border-radius:28px}.dot{display:none}.c-av img{width:40px;height:40px;border-radius:12px}.contact.cur{background:#f0f0f0}.readtip.dis{display:none}.msg{align-items:flex-end}.msg .readtip{font-size:12px;color:red}.msg .readtip font{color:green}.msg .bubble{max-width:calc(100% - 40px);word-break:break-all}.mabox{display:flex;gap:5px}.mabox .box{display:flex;flex-direction:column;align-items:center}.mabox .box img{width:88px;height:88px}.mabox .box font{color:red}.matip{background:#ffffe0;color:#ff0000}.c-preview{text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical}