*{box-sizing:border-box;margin:0}html,body,#root{height:100%}body{font-family:Hiragino Sans,Noto Sans JP,system-ui,sans-serif;background:#faf9f7;color:#1c1917}.loading{display:grid;place-items:center;height:100%;color:#78716c}.layout{display:flex;height:100%}.content{flex:1;min-width:0;display:flex;flex-direction:column}.topbar,.backdrop{display:none}.sidebar{width:264px;flex-shrink:0;display:flex;flex-direction:column;background:#f5f4f2;border-right:1px solid #e7e5e4}.brand{padding:16px 18px;font-weight:700;letter-spacing:.12em;border-bottom:1px solid #e7e5e4}.threadlist{flex:1;display:flex;flex-direction:column;min-height:0;padding:10px;gap:8px}.new-chat{display:flex;align-items:center;justify-content:center;gap:6px;height:38px;border:1px solid #d6d3d1;border-radius:10px;background:#fff;font-size:14px;font-weight:600;cursor:pointer;color:#1c1917}.new-chat:hover{background:#fafaf9}.threads{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px}.thread-item{display:flex;align-items:center;height:36px;border-radius:8px;padding-right:4px}.thread-item:hover{background:#ebe9e6}.thread-item[data-active=true]{background:#e4e2df}.thread-trigger{flex:1;min-width:0;text-align:left;border:none;background:none;cursor:pointer;padding:0 10px;font-size:13.5px;color:#292524;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.thread-del{border:none;background:none;cursor:pointer;color:#a8a29e;font-size:18px;line-height:1;width:24px;height:24px;border-radius:6px;opacity:0;flex-shrink:0}.thread-item:hover .thread-del{opacity:1}.thread-del:hover{background:#ddd9d5;color:#1c1917}.user-badge{display:flex;align-items:center;gap:10px;padding:12px 16px;border-top:1px solid #e7e5e4}.avatar{width:32px;height:32px;border-radius:50%;flex-shrink:0;background:#1c1917;color:#fff;display:grid;place-items:center;font-size:12px;font-weight:700}.user-text{font-size:12px;line-height:1.35;color:#57534e}.user-text code{font-size:11px;color:#292524}.main{flex:1;min-width:0;display:flex;flex-direction:column}.content .main{flex:1}.thread{flex:1;display:flex;flex-direction:column;min-height:0}.viewport{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding:20px;max-width:760px;width:100%;margin:0 auto}.empty{margin:auto;display:flex;flex-direction:column;align-items:center;gap:16px;padding:20px}.empty-hint{color:#a8a29e;font-size:15px}.empty-history{display:none;align-items:center;gap:6px;padding:10px 18px;border:1px solid #d6d3d1;border-radius:999px;background:#fff;color:#1c1917;font-size:14px;font-weight:600;cursor:pointer}.empty-history:active{background:#f0efed}.msg{display:flex}.msg.user{justify-content:flex-end}.msg.assistant{justify-content:flex-start}.bubble{max-width:80%;padding:10px 14px;border-radius:16px;font-size:15px;line-height:1.6;white-space:pre-wrap}.user-bubble{background:#1c1917;color:#fff;border-bottom-right-radius:4px}.assistant-bubble{background:#fff;border:1px solid #e7e5e4;border-bottom-left-radius:4px}.footer{position:sticky;bottom:0;padding:12px 20px 18px;background:linear-gradient(transparent,#faf9f7 30%);max-width:760px;width:100%;margin:0 auto}.composer{display:flex;align-items:flex-end;gap:8px;background:#fff;border:1px solid #d6d3d1;border-radius:24px;padding:8px 8px 8px 18px}.input{flex:1;border:none;outline:none;resize:none;font:inherit;font-size:15px;line-height:1.5;max-height:160px;background:transparent}.send{width:36px;height:36px;border:none;border-radius:50%;background:#1c1917;color:#fff;font-size:16px;cursor:pointer;flex-shrink:0}.send:disabled{opacity:.3;cursor:default}@media(max-width:768px){.topbar{display:flex;align-items:center;gap:10px;padding:10px 12px;border-bottom:1px solid #e7e5e4;background:#fff;flex-shrink:0}.hamburger,.topbar-new{width:38px;height:38px;flex-shrink:0;border:none;background:none;font-size:20px;cursor:pointer;color:#1c1917;border-radius:8px}.hamburger:active,.topbar-new:active{background:#f0efed}.topbar-title{flex:1;min-width:0;text-align:center;font-size:15px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:40;width:82vw;max-width:320px;transform:translate(-100%);transition:transform .22s ease;box-shadow:2px 0 16px #0000001f}.sidebar.open{transform:translate(0)}.backdrop{display:block;position:fixed;inset:0;z-index:30;background:#00000059}.thread-item{height:44px}.thread-trigger{font-size:15px}.thread-del{opacity:.5}.viewport,.footer{padding-left:14px;padding-right:14px}.empty-history{display:inline-flex}}