:root{--bg:#f7f7f4;--panel:#ffffff;--soft:#f0f2ef;--sidebar:#202421;--text:#202421;--muted:#66716b;--line:#e1e4df;--accent:#24745b;--accent-strong:#195942;--danger:#a33a32;--shadow:0 18px 50px rgba(32,36,33,0.08)}*{box-sizing:border-box}body,html{height:100%}body{margin:0;overflow:hidden;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,textarea{font:inherit}button{cursor:pointer}.chat-shell{display:grid;grid-template-columns:280px minmax(0,1fr);height:100vh}.chat-sidebar{display:flex;flex-direction:column;gap:14px;padding:16px;color:#fff;background:var(--sidebar)}.brand{display:flex;align-items:center;gap:10px;min-height:44px}.brand>span{display:grid;width:36px;height:36px;place-items:center;border-radius:8px;color:#123629;background:#a8e5c8;font-weight:800}.brand small,.brand strong,.history-item small,.history-item strong{display:block}.brand small,.history-item small{color:#b8c2bd}.history-item,.new-chat{width:100%;min-height:42px;padding:10px 12px;border:1px solid rgba(255,255,255,.12);border-radius:8px;color:white;background:rgba(255,255,255,.06);text-align:left}.new-chat{font-weight:800}.history-item.active{background:rgba(255,255,255,.12)}.chat-main{display:grid;grid-template-rows:auto minmax(0,1fr) auto;min-width:0;height:100vh}.chat-header{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:64px;padding:12px 22px;border-bottom:1px solid var(--line);background:rgba(247,247,244,.88);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.chat-header span,.chat-header strong{display:block}.chat-header span{margin-top:2px;color:var(--muted);font-size:13px}.chat-header small{flex:0 0 auto;padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--accent-strong);background:var(--panel);font-weight:800}.messages{overflow-y:auto;padding:28px 20px 160px}.prompt-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px;max-width:760px;margin:0 auto 22px}.prompt-grid button{min-height:58px;padding:12px 14px;border:1px solid var(--line);border-radius:8px;color:var(--text);background:var(--panel);text-align:left;line-height:1.45;box-shadow:var(--shadow)}.chat-message{display:grid;grid-template-columns:36px minmax(0,760px);grid-gap:12px;gap:12px;max-width:820px;margin:0 auto 18px}.chat-message.user{grid-template-columns:minmax(0,760px) 36px}.chat-message.user .avatar{grid-column:2}.avatar{display:grid;width:36px;height:36px;place-items:center;border-radius:8px;color:#fff;background:#2d332f;font-weight:800}.chat-message.user .avatar{color:#173225;background:#ccefdc}.bubble{min-width:0;padding:14px 15px;border:1px solid var(--line);border-radius:8px;background:var(--panel);box-shadow:var(--shadow)}.chat-message.user .bubble{background:#eef7f2;box-shadow:none}.bubble p{margin:0;line-height:1.65}.mode-tag{margin-bottom:8px;padding:4px 8px;color:var(--accent-strong);background:#e5f3ec;font-size:12px;font-weight:800}.image-chip,.mode-tag{display:inline-flex;border-radius:999px}.image-chip{margin-top:10px;padding:5px 8px;background:var(--soft)}.image-chip,.typing{color:var(--muted)}.chat-composer-wrap{position:fixed;right:0;bottom:0;left:280px;padding:12px 18px 16px;border-top:1px solid rgba(225,228,223,.72);background:linear-gradient(rgba(247,247,244,.74),var(--bg) 32%)}.chat-composer,.chat-composer-wrap>p,.upload-pill{max-width:820px;margin-right:auto;margin-left:auto}.upload-pill{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--muted);font-size:13px}.upload-pill button{border:0;color:var(--muted);background:transparent;font-size:20px}.chat-composer{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;grid-gap:8px;gap:8px;align-items:end;padding:8px;border:1px solid #cfd8d3;border-radius:18px;background:var(--panel);box-shadow:0 12px 30px rgba(31,36,33,.11)}.chat-composer button{display:grid;width:44px;height:44px;place-items:center;border:0;border-radius:12px;color:white;background:var(--accent);font-weight:800}.chat-composer button:disabled{opacity:.55}.file-input{display:none}textarea{width:100%;max-height:150px;min-height:44px;padding:11px 4px;resize:none;border:0;outline:0;background:transparent;color:var(--text);line-height:1.5}.chat-composer-wrap>p{margin-top:8px;margin-bottom:0;color:var(--muted);font-size:12px;text-align:center}@media (max-width:820px){body{overflow:hidden}.chat-shell{display:block;height:100dvh}.chat-sidebar{display:none}.chat-main{height:100dvh}.chat-header{min-height:58px;padding:10px 14px}.chat-header span{display:none}.chat-header small{font-size:12px}.messages{padding:18px 12px 150px}.prompt-grid{grid-template-columns:1fr}.prompt-grid button{min-height:52px}.chat-message,.chat-message.user{grid-template-columns:32px minmax(0,1fr);gap:10px}.chat-message.user .avatar{grid-column:1}.avatar{width:32px;height:32px;font-size:13px}.bubble{padding:13px}.chat-composer-wrap{left:0;padding:10px 10px 12px}}