:root{--bg:#f7f8fa;--card:#ffffff;--muted:#6b7280;--text:#0f172a;--primary:#2563eb;--line:#e5e7eb;--accent:#eef2ff}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.4 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;overflow:hidden}.layout{display:grid;grid-template-columns:300px 1fr;height:100vh}.sidebar{background:var(--card);border-right:1px solid var(--line);padding:14px;display:flex;flex-direction:column}.brand{font-weight:700;font-size:18px;margin-bottom:8px}.hint{color:var(--muted);margin-bottom:12px}.chatlist{display:flex;flex-direction:column;gap:6px;overflow:auto}.chatlist-item{display:flex;gap:10px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px;cursor:pointer;text-align:left}.chatlist-item.active{border-color:var(--primary);background:var(--accent)}.avatar{width:36px;height:36px;border-radius:10px;background:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:600}.meta .title{font-weight:600}.meta .subtitle{font-size:12px;color:var(--muted)}.main{display:flex;align-items:stretch;justify-content:center;padding:16px;overflow:hidden;min-height:0}.chatwin{width:100%;max-width:960px;display:flex;flex-direction:column;gap:12px;height:100%;min-height:0}.chatwin-header{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;position:sticky;top:0;z-index:5}.chatwin-header .title{font-size:16px;font-weight:700}.chatwin-header .small{font-size:12px;color:var(--muted)}.messages{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:10px;min-height:0;padding-bottom:8px}.msg{display:flex}.msg.me{justify-content:flex-end}.bubble{max-width:70%;padding:10px 12px;border-radius:14px;border:1px solid var(--line);background:var(--card)}.msg.me .bubble{background:#e8f0ff;border-color:#d8e6ff}.bubble .type{font-size:11px;color:var(--muted)}.bubble .body{margin-top:6px;white-space:pre-wrap;word-break:break-word}.composer{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:12px;display:flex;flex-direction:column;gap:8px;padding-bottom:calc(12px + env(safe-area-inset-bottom,0))}.row{display:flex;gap:8px}.input{flex:1;border:1px solid var(--line);border-radius:10px;padding:10px;background:#fff}.file{flex:1;border:1px dashed var(--line);border-radius:10px;padding:8px;background:#fff}.btn{background:var(--primary);color:#fff;border:none;border-radius:10px;padding:10px 14px;cursor:pointer}.btn:hover{opacity:.95}.empty{display:flex;align-items:center;justify-content:center;color:var(--muted)}.qr-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a59;display:flex;align-items:center;justify-content:center}.qr-card{background:var(--card);padding:20px;border-radius:16px;border:1px solid var(--line);text-align:center}.small{font-size:12px;color:var(--muted)}.bubble audio{display:block;width:260px;min-width:240px;height:32px}.msg .bubble:has(audio){max-width:none}.bubble.voice{width:clamp(360px,55vw,640px);max-width:100%}.msg.me .bubble.voice,.msg.them .bubble.voice{display:block}.voice-note{display:flex;align-items:center;gap:12px;width:100%}.voice-note .play{width:36px;height:36px;border-radius:999px;border:none;cursor:pointer;font-size:16px;line-height:1;display:flex;align-items:center;justify-content:center;background:var(--primary);color:#fff}.msg.them .voice-note .play{background:#64748b}.voice-note .wave{flex:1;height:36px;display:flex;align-items:center;gap:3px}.voice-note .wave span{width:3px;border-radius:2px;background:#dbeafe}.voice-note .wave span.on{background:#2563eb}.msg.them .voice-note .wave span.on{background:#94a3b8}.voice-note .time{width:42px;text-align:right;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}.chatlist-search{position:sticky;top:0;z-index:2;background:var(--card);padding:8px;border-bottom:1px solid var(--line)}.chatlist-search .input{width:100%;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:#f9fafb;outline:none}.chatlist-search .input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #2563eb26}.chatlist-search .input::placeholder{color:var(--muted)}