:root {
  --bg: #fafaf8;
  --fg: #1d1d1b;
  --muted: #5f5f5a;
  --line: #d8d8d2;
  --card: #ffffff;
  --accent: #1f5f8b;
  --accent-fg: #ffffff;
  --error-bg: #fdecea;
  --error-fg: #8a1c12;
  --notice-bg: #eaf3fb;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615;
    --fg: #ececea;
    --muted: #a5a5a0;
    --line: #3a3a37;
    --card: #20201e;
    --accent: #6fb0e0;
    --accent-fg: #0c1a24;
    --error-bg: #3a1714;
    --error-fg: #f6b8b0;
    --notice-bg: #14283a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.brand { font-weight: 600; }
.tabs { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem; flex: 1; }
.tabs a {
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  color: var(--fg);
  text-decoration: none;
}
.tabs a[aria-current="page"] { background: var(--accent); color: var(--accent-fg); }
.logout { margin-left: auto; }
main { max-width: 56rem; margin: 0 auto; padding: 1rem; }
h1 { font-size: 1.5rem; margin: 0.5rem 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.5rem; }
a { color: var(--accent); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  margin: 0 0 1rem;
}
label { display: block; margin: 0 0 0.75rem; }
input, textarea, select, button { font: inherit; }
input, textarea {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
}
button {
  padding: 0.6rem 1rem;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
button.danger { color: var(--error-fg); }
button:disabled { opacity: 0.6; cursor: default; }
.error { background: var(--error-bg); color: var(--error-fg); padding: 0.75rem; border-radius: 6px; }
.notice { background: var(--notice-bg); }
.status { color: var(--muted); min-height: 1.5em; margin: 0.5rem 0 0; }
.small { font-size: 0.875rem; word-break: break-all; }
input.link { font-family: ui-monospace, monospace; font-size: 0.875rem; }
table { width: 100%; border-collapse: collapse; margin: 0 0 1rem; }
th, td { text-align: left; padding: 0.5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
form.inline { display: flex; gap: 0.25rem; margin-top: 0.25rem; }
form.inline input { width: 6rem; margin: 0; }
td.actions form { display: inline-block; margin: 0 0.25rem 0.25rem 0; }
pre { white-space: pre-wrap; word-wrap: break-word; overflow-x: auto; }
/* Narrow screens: each table row becomes a stacked card. */
@media (max-width: 40rem) {
  table, thead, tbody, tr, th, td { display: block; }
  thead { position: absolute; left: -9999px; }
  tr { border: 1px solid var(--line); border-radius: 8px; margin: 0 0 0.75rem; padding: 0.25rem 0.5rem; background: var(--card); }
  td { border: 0; padding: 0.25rem 0; }
  td[data-label]::before { content: attr(data-label) ": "; color: var(--muted); }
}
[hidden] { display: none !important; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
a.button {
  display: inline-block;
  padding: 0.6rem 1rem;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
}
a.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
ul.chats { list-style: none; padding: 0; margin: 0 0 1rem; }
ul.chats li { padding: 0.6rem 0; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.when { color: var(--muted); font-size: 0.875rem; white-space: nowrap; }
/* Chat: messages keep their line breaks and wrap long words on narrow screens. */
.messages { display: flex; flex-direction: column; gap: 0.5rem; margin: 0 0 0.5rem; }
.msg {
  max-width: 90%;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.msg.user { align-self: flex-end; background: var(--notice-bg); }
.msg.assistant { align-self: flex-start; background: var(--card); }
.chat-form { display: flex; gap: 0.5rem; align-items: stretch; margin: 0.5rem 0 1rem; }
.chat-form input { margin: 0; flex: 1; min-width: 0; }
#chat-error { margin: 0.5rem 0; }