:root{--bg:#f6f3ee;--panel:#fffdfa;--panel-strong:#fff;--ink:#20201d;--muted:#706e67;--line:#ded8cf;--line-strong:#c8beb1;--accent:#0f766e;--accent-dark:#0b5f59;--accent-soft:#d8f1ed;--danger:#b42318;--warning:#9a5b00;--shadow:0 18px 60px #2c261c1c}*{box-sizing:border-box}html,body{min-height:100%}body{background:linear-gradient(135deg, #0f766e14, transparent 34%), linear-gradient(45deg, #9a5b0014, transparent 42%), var(--bg);color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{grid-template-columns:320px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{border-right:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#fffdfadb;flex-direction:column;gap:18px;padding:22px;display:flex}.brand{align-items:center;gap:12px;min-width:0;display:flex}.brand-mark{background:var(--accent);color:#fff;border-radius:8px;place-items:center;width:38px;height:38px;font-weight:800;display:grid}.brand-title{margin:0;font-size:18px;line-height:1.2}.brand-subtitle{color:var(--muted);margin:2px 0 0;font-size:13px}.sidebar-actions{gap:8px;display:flex}.icon-button,.primary-button,.ghost-button{border:1px solid var(--line);background:var(--panel-strong);color:var(--ink);border-radius:8px;justify-content:center;align-items:center;gap:8px;min-height:40px;padding:0 12px;transition:background .16s,border-color .16s,transform .16s;display:inline-flex}.icon-button{flex:none;width:40px;padding:0}.primary-button{background:var(--accent);border-color:var(--accent);color:#fff}.primary-button:hover{background:var(--accent-dark)}.ghost-button:hover,.icon-button:hover{border-color:var(--line-strong);transform:translateY(-1px)}.primary-button:disabled,.ghost-button:disabled,.icon-button:disabled{cursor:not-allowed;opacity:.55;transform:none}.sessions{flex-direction:column;gap:8px;padding-right:2px;display:flex;overflow:auto}.session-item{text-align:left;width:100%;color:var(--ink);background:0 0;border:1px solid #0000;border-radius:8px;padding:11px 12px}.session-item:hover{background:#0f766e14}.session-item.active{background:var(--accent-soft);border-color:#0f766e38}.session-title{white-space:nowrap;text-overflow:ellipsis;font-weight:650;display:block;overflow:hidden}.session-date{color:var(--muted);margin-top:4px;font-size:12px;display:block}.user-strip{border-top:1px solid var(--line);align-items:center;gap:10px;margin-top:auto;padding-top:16px;display:flex}.user-email{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:13px;overflow:hidden}.chat{grid-template-rows:auto minmax(0,1fr) auto;min-width:0;height:100vh;display:grid}.chat-header{border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#f6f3eeb8;justify-content:space-between;align-items:center;gap:16px;padding:22px 30px;display:flex}.chat-heading{margin:0;font-size:22px;line-height:1.2}.chat-meta{color:var(--muted);font-size:13px}.messages{flex-direction:column;gap:16px;padding:26px 30px;display:flex;overflow:auto}.empty-state{text-align:center;max-width:520px;color:var(--muted);margin:auto}.empty-state h2{color:var(--ink);margin:0 0 10px;font-size:30px;line-height:1.16}.message-row{display:flex}.message-row.user{justify-content:flex-end}.message-bubble{border:1px solid var(--line);background:var(--panel);white-space:pre-wrap;border-radius:8px;width:fit-content;max-width:min(760px,78%);padding:13px 15px;line-height:1.55;box-shadow:0 6px 20px #2c261c0f}.message-row.user .message-bubble{background:var(--accent);border-color:var(--accent);color:#fff}.message-status{color:var(--muted);align-items:center;gap:7px;display:inline-flex}.message-status.error{color:var(--danger)}.spin{animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.composer{border-top:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#fffdfae0;padding:18px 30px 24px}.composer-form{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:10px;display:grid}.composer textarea,.auth-card input{border:1px solid var(--line-strong);width:100%;color:var(--ink);background:#fff;border-radius:8px;outline:none;padding:12px 13px}.composer textarea{resize:none;min-height:48px;max-height:180px}.composer textarea:focus,.auth-card input:focus{border-color:var(--accent);box-shadow:0 0 0 3px #0f766e29}.composer-hint,.form-note,.error-text{color:var(--muted);margin:8px 0 0;font-size:13px}.error-text{color:var(--danger)}.auth-page{place-items:center;min-height:100vh;padding:24px;display:grid}.auth-card{border:1px solid var(--line);width:min(100%,430px);box-shadow:var(--shadow);background:#fffdfaf0;border-radius:8px;padding:28px}.auth-card h1{margin:0 0 10px;font-size:28px}.auth-card p{color:var(--muted);line-height:1.5}.auth-card form{gap:12px;margin-top:20px;display:grid}@media (max-width:820px){.app-shell{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line);max-height:220px;padding:14px}.sessions{flex-direction:row;overflow:auto hidden}.session-item{min-width:210px}.user-strip{display:none}.chat{height:calc(100vh - 220px)}.chat-header,.messages,.composer{padding-left:16px;padding-right:16px}.message-bubble{max-width:92%}}