:root {
  --bg: #f6f6f4; --card: #fff; --text: #1d1d1f; --muted: #6b6b70; --line: #e2e2e0;
  --accent: #2f6fed; --accent-text: #fff; --user: #e8effd; --err: #b42318; --err-bg: #fdecea; --ok-bg: #e7f6ec;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #161618; --card: #1f1f22; --text: #ececee; --muted: #9a9aa0; --line: #2e2e33;
    --accent: #5b8dff; --user: #22304d; --err: #ff8a80; --err-bg: #3a1d1b; --ok-bg: #1b3324; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-decoration: none; }
input, textarea, button { font: inherit; color: inherit; }
input, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); }
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button { padding: 10px 18px; border: 0; border-radius: 10px; background: var(--accent); color: var(--accent-text); cursor: pointer; }
button:disabled { opacity: .6; }
button.link { background: none; color: var(--accent); padding: 0; }
button.danger { background: var(--err-bg); color: var(--err); padding: 6px 12px; }
.muted { color: var(--muted); margin-top: 0; }
.err { background: var(--err-bg); color: var(--err); padding: 10px 12px; border-radius: 10px; margin: 8px 0; }
.ok { background: var(--ok-bg); padding: 10px 12px; border-radius: 10px; margin: 8px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }

.auth { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.auth .card { width: 100%; max-width: 360px; display: grid; gap: 14px; }
.auth h1 { margin: 0; font-size: 24px; }
.auth label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); }

.top { position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; color: var(--text); }
.top nav { display: flex; gap: 16px; align-items: center; font-size: 14px; flex-wrap: wrap; justify-content: flex-end; }

.chat { max-width: 820px; margin: 0 auto; padding: 16px 16px 200px; }
#log { display: grid; gap: 14px; }
.empty { color: var(--muted); text-align: center; padding: 60px 0; }
.msg { max-width: 100%; overflow-wrap: anywhere; }
.msg .body { white-space: pre-wrap; }
.msg.user { justify-self: end; background: var(--user); padding: 10px 14px; border-radius: 14px 14px 4px 14px; max-width: 85%; }
.msg.assistant { background: var(--card); border: 1px solid var(--line); padding: 12px 16px; border-radius: 14px; }
.msg pre { white-space: pre; overflow-x: auto; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 10px; font-size: 14px; }
.msg code { font-family: ui-monospace, Consolas, monospace; font-size: .92em; }
.msg :not(pre) > code { background: var(--bg); padding: 1px 5px; border-radius: 4px; }
.msg .h { display: inline-block; font-size: 1.05em; }
.think { margin-bottom: 8px; color: var(--muted); font-size: 14px; }
.think summary { cursor: pointer; }
.think div { white-space: pre-wrap; border-left: 3px solid var(--line); padding-left: 10px; margin-top: 6px; }
.typing { color: var(--muted); }
.typing span { animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .2; } }

#form { position: fixed; left: 0; right: 0; bottom: 0; background: var(--card); border-top: 1px solid var(--line); padding: 12px 16px; }
#form > * { max-width: 820px; margin-left: auto; margin-right: auto; }
#form textarea { resize: vertical; min-height: 60px; max-height: 40vh; display: block; }
.bar { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
.bar .chk { flex: 1; font-size: 14px; color: var(--muted); }
.chk { display: flex; gap: 6px; align-items: center; white-space: nowrap; }
.chk input { width: auto; }

.settings { max-width: 720px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; }
.settings h2 { margin: 0 0 12px; font-size: 18px; }
.settings h3 { margin: 18px 0 8px; font-size: 15px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.row input:not([type=checkbox]) { flex: 1 1 180px; width: auto; }
table { width: 100%; border-collapse: collapse; }
td { padding: 8px 0; border-bottom: 1px solid var(--line); }
td.r { text-align: right; }
.tag { font-size: 12px; background: var(--user); padding: 1px 8px; border-radius: 99px; }
@media (max-width: 560px) { .bar .chk { white-space: normal; } }