:root{color-scheme:dark;--bg: #0b0d10;--surface: #151a21;--border: #232a33;--accent: #4f8cff;--incoming-bg: #20262f;--text: #e6eaf0;--text-muted: #8b95a3;--danger: #ff6b6b;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji"}@media (prefers-color-scheme: light){:root{color-scheme:light;--bg: #f4f5f7;--surface: #ffffff;--border: #dfe3e8;--incoming-bg: #eef0f3;--text: #14181f;--text-muted: #6b7280}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);line-height:1.4;-webkit-font-smoothing:antialiased}button,input{font:inherit;color:inherit}.app-shell{display:flex;height:100vh}.app-loading{height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg)}.spinner{width:32px;height:32px;border-radius:50%;border:3px solid var(--border);border-top-color:var(--accent);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.chat-empty{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-muted)}.conversation-list{width:280px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;height:100vh}.conversation-list-header{padding:16px;border-bottom:1px solid var(--border);font-weight:600}.conversation-items{list-style:none;margin:0;padding:8px;overflow-y:auto;flex:1}.conversation-item{width:100%;display:grid;grid-template-columns:1fr auto;column-gap:8px;row-gap:2px;text-align:left;background:none;border:none;border-radius:8px;padding:8px;cursor:pointer}.conversation-item:hover{background:#7f7f7f14}.conversation-item-active{background:#4f8cff24}.conversation-username{font-weight:600;grid-column:1}.conversation-time{color:var(--text-muted);font-size:12px;grid-column:2}.conversation-preview{grid-column:1 / -1;color:var(--text-muted);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.new-chat{display:flex;gap:8px;padding:8px;border-top:1px solid var(--border)}.new-chat-input{flex:1;min-width:0;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px}.new-chat-button,.chat-send,.auth-submit{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:8px 16px;font-weight:600;cursor:pointer}.new-chat-button:hover,.chat-send:hover,.auth-submit:hover{filter:brightness(1.08)}.chat-view{flex:1;min-width:0;display:flex;flex-direction:column;height:100vh}.chat-header{display:flex;align-items:center;gap:8px;padding:16px;border-bottom:1px solid var(--border);background:var(--surface)}.chat-back{background:none;border:none;font-size:18px;cursor:pointer;padding:4px 8px;border-radius:8px}.chat-back:hover{background:#7f7f7f14}.chat-peer{font-weight:600}.chat-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px}.chat-composer{position:sticky;bottom:0;display:flex;gap:8px;padding:12px 16px calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--border);background:var(--surface)}.chat-input{flex:1;min-width:0;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 12px}.bubble-row{display:flex}.bubble-row-out{justify-content:flex-end}.bubble-row-in{justify-content:flex-start}.bubble{max-width:72%;padding:8px 12px;border-radius:16px;line-height:1.4}.bubble-out{background:var(--accent);color:#fff;border-bottom-right-radius:4px}.bubble-in{background:var(--incoming-bg);color:var(--text);border-bottom-left-radius:4px}.bubble-text{margin:0;white-space:pre-wrap;word-break:break-word}.bubble-placeholder{font-style:italic;opacity:.85}.bubble-meta{display:flex;gap:4px;justify-content:flex-end;margin-top:4px;font-size:11px;opacity:.75}.auth-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:16px}.auth-card{width:100%;max-width:360px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:24px}.auth-title{margin:0 0 16px;font-size:20px}.auth-tabs{display:flex;gap:4px;margin-bottom:16px;border-bottom:1px solid var(--border)}.auth-tab{flex:1;background:none;border:none;color:var(--text-muted);padding:8px;cursor:pointer;border-bottom:2px solid transparent}.auth-tab-active{color:var(--text);border-bottom-color:var(--accent)}.auth-form{display:flex;flex-direction:column;gap:8px}.auth-label{font-size:12px;color:var(--text-muted)}.auth-input{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:8px 12px}.auth-error{color:var(--danger);font-size:13px;margin:0}.auth-submit{margin-top:8px}