:root { --fg:#1a1a1a; --bg:#fff; --muted:#666; --line:#ddd; --accent:#b4562b; }
@media (prefers-color-scheme: dark) { :root { --fg:#eee; --bg:#161616; --muted:#999; --line:#333; } }
* { box-sizing: border-box; }
body { margin:0; font:15px/1.5 system-ui, sans-serif; color:var(--fg); background:var(--bg); }
header { display:flex; justify-content:space-between; padding:12px 20px; border-bottom:1px solid var(--line); }
h1 { font-size:18px; margin:0; } h2 { font-size:14px; margin:16px 0 8px; color:var(--muted); text-transform:uppercase; letter-spacing:.04em; }
main { display:grid; grid-template-columns:300px 1fr; min-height:calc(100vh - 50px); }
aside { padding:16px; border-right:1px solid var(--line); }
section { padding:16px 24px; max-width:900px; }
input, textarea, button { font:inherit; padding:8px; width:100%; margin-bottom:8px; border:1px solid var(--line); border-radius:6px; background:var(--bg); color:var(--fg); }
button { background:var(--accent); color:#fff; border:0; cursor:pointer; }
ul { list-style:none; padding:0; margin:0; } li a { display:block; padding:6px 0; color:var(--fg); text-decoration:none; border-bottom:1px solid var(--line); }
li small { color:var(--muted); }
.msg { white-space:pre-wrap; margin:10px 0; padding:10px 12px; border-radius:8px; border:1px solid var(--line); }
.assistant { background:color-mix(in srgb, var(--accent) 6%, var(--bg)); }
.user { margin-left:48px; } .tool { color:var(--muted); font:12px/1.4 ui-monospace, monospace; border:0; padding:0 12px; margin:2px 0; }
.err { color:#c0392b; } #bar { display:flex; gap:12px; align-items:baseline; flex-wrap:wrap; margin-bottom:8px; }
#status, #usage { color:var(--muted); font-size:13px; } #previews a { margin-right:12px; }
@media (max-width:760px) { main { grid-template-columns:1fr; } aside { border-right:0; border-bottom:1px solid var(--line); } }