:root{color-scheme:light dark;--bg: #f5f6fa;--fg: #1a1a1a;--muted: #6c7280;--primary: #1976d2;--primary-hover: #145ea8;--error: #b91c1c;--error-bg: #fee2e2;--ok: #047857;--border: #e0e3eb;--card: #ffffff;--own-bubble: #1976d2;--own-bubble-fg: #ffffff;--other-bubble: #ffffff;--other-bubble-fg: #1a1a1a}@media (prefers-color-scheme: dark){:root{--bg: #11131a;--fg: #e6e8ec;--muted: #9aa3b2;--border: #2a2f3a;--card: #1a1d27;--other-bubble: #232734;--other-bubble-fg: #e6e8ec;--error-bg: #3b0e0e}}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:14px;line-height:1.45}.app{display:flex;flex-direction:column;height:100%}.app__header{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:12px 20px;background:var(--card);border-bottom:1px solid var(--border)}.app__header h1{margin:0;font-size:18px;font-weight:600}.app__header-meta{display:flex;align-items:center;gap:12px}.badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:500}.badge--ok{background:#d1fae5;color:var(--ok)}.app__main{flex:1;min-height:0;display:flex}.app__footer{padding:8px 20px;background:var(--card);border-top:1px solid var(--border);color:var(--muted);text-align:center}.app__loading{padding:40px;text-align:center;color:var(--muted)}.notice{margin:12px 0;padding:10px 14px;border-radius:8px;font-size:13px}.notice--error{background:var(--error-bg);color:var(--error)}.btn{border:1px solid transparent;border-radius:8px;padding:10px 16px;font-size:14px;font-weight:500;cursor:pointer;background:transparent;color:var(--fg)}.btn:disabled{opacity:.6;cursor:default}.btn--primary{background:var(--primary);color:#fff}.btn--primary:hover:not(:disabled){background:var(--primary-hover)}.btn--ghost{background:transparent;border-color:var(--border);color:var(--fg)}.btn--link{background:transparent;color:var(--primary);text-decoration:underline;padding:4px 0}.login{flex:1;display:flex;align-items:center;justify-content:center;padding:24px}.login__card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px;width:100%;max-width:380px}.login__card h2{margin:0 0 16px;font-size:20px}.login__form{display:flex;flex-direction:column;gap:12px}.login__field{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}.login__field input{padding:10px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--fg);font-size:14px}.login__switch{margin-top:12px;text-align:center}.chat{flex:1;display:flex;min-height:0}.chat__sidebar{width:320px;border-right:1px solid var(--border);background:var(--card);overflow-y:auto}.chat__main{flex:1;display:flex;flex-direction:column;min-width:0}.chat__empty{flex:1;display:flex;align-items:center;justify-content:center;color:var(--muted)}.conversations__new{display:flex;flex-direction:column;gap:6px;padding:12px;border-bottom:1px solid var(--border)}.conversations__new input{padding:8px 10px;border:1px solid var(--border);border-radius:6px;background:var(--bg);color:var(--fg);font-size:13px}.conversations__list{list-style:none;margin:0;padding:0}.conversations__empty{padding:16px;color:var(--muted);font-style:italic}.conversations__item{border-bottom:1px solid var(--border)}.conversations__btn{display:block;width:100%;text-align:left;background:transparent;border:0;padding:14px 16px;cursor:pointer;color:var(--fg)}.conversations__item--active .conversations__btn{background:#1976d214}.conversations__title{font-weight:600;font-size:14px}.conversations__preview{color:var(--muted);font-size:12px;margin-top:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px}.messages__item{display:flex;justify-content:flex-start}.messages__item--own{justify-content:flex-end}.messages__bubble{max-width:70%;padding:10px 14px;background:var(--other-bubble);color:var(--other-bubble-fg);border:1px solid var(--border);border-radius:14px;word-wrap:break-word}.messages__item--own .messages__bubble{background:var(--own-bubble);color:var(--own-bubble-fg);border-color:var(--own-bubble)}.composer{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--border);background:var(--card)}.composer__input{flex:1;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--fg);font-size:14px}