:root {
  --bg: #14161a;
  --bg-side: #1b1e24;
  --bg-raise: #21252c;
  --line: #2c313a;
  --text: #e6e8ec;
  --text-dim: #9aa2b1;
  --text-faint: #6b7483;
  --accent: #7aa2f7;
  --accent-soft: #7aa2f71a;
  --agent: #c8a2ff;
  --danger: #f7768e;
  --ok: #9ece6a;
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* The one knob that scales the whole interface. Everything below is sized
     in rem, so changing this moves type, avatars and the sidebar together
     rather than leaving a large font rattling around in a fixed-width
     column. Set from the picker in the sidebar and remembered per browser. */
  --ui-font: 18px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

/* Kept apart from the rule below on purpose: the `font` shorthand resets
   font-size, so applying it to html as well would silently undo --ui-font. */
html { font-size: var(--ui-font); }

body {
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

[hidden] { display: none !important; }

/* ---------------------------------------------------------------- sign-in */

.gate {
  display: grid;
  place-items: center;
  min-height: 100%;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 25.3rem;
  background: var(--bg-side);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px;
}

.card h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
.card .sub { margin: 6px 0 26px; color: var(--text-dim); font-size: 0.933rem; }
.card label { display: block; font-size: 0.8rem; color: var(--text-dim); margin-bottom: 6px; }

.card input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
}
.card input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }

.card button {
  width: 100%;
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--accent);
  color: #10131a;
  border: 0;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.card button:disabled { opacity: 0.5; cursor: default; }

.card .msg { min-height: 20px; margin: 14px 0 0; font-size: 0.867rem; }
.card .msg.ok { color: var(--ok); }
.card .msg.err { color: var(--danger); }
.card .fine { margin: 18px 0 0; font-size: 0.8rem; line-height: 1.5; color: var(--text-faint); }

/* --------------------------------------------------------------- shell */

.app {
  display: grid;
  grid-template-columns: 15.5rem 1fr;
  height: 100%;
}

.sidebar {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--bg-side);
  border-right: 1px solid var(--line);
  padding: 14px 0 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 2px 16px 16px;
  font-size: 1.133rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 2rem;
  height: 2.47rem;
  flex: none;
  color: var(--text);
  overflow: visible;
}

.brand-bits {
  fill: var(--accent);
  font-family: var(--mono);
  font-size: 0.867rem;
  font-weight: 700;
  text-anchor: middle;
}

/* Standing reminder, directly under the mark so it is read before anything
   is typed rather than buried in a policy page nobody opens. */
.notice {
  margin: 0 16px 14px;
  padding: 7px 9px;
  background: #3a2f1a;
  border-left: 2px solid #d7a55a;
  border-radius: 4px;
  color: #e2c894;
  font-size: 0.733rem;
  line-height: 1.4;
}

.section { padding: 0 8px 16px; min-height: 0; }
.section.grow { flex: 1; overflow-y: auto; }

.section h2 {
  margin: 0 0 6px;
  padding: 0 8px;
  font-size: 0.733rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.channels, .roster { list-style: none; margin: 0; padding: 0; }

.channels button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 5px 8px;
  background: none;
  border: 0;
  border-radius: 6px;
  color: var(--text-dim);
  font: inherit;
  cursor: pointer;
}
.channels button:hover { background: var(--bg-raise); color: var(--text); }
.channels button[aria-current="true"] {
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 600;
}

.roster li {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 8px;
  color: var(--text-dim);
  font-size: 0.933rem;
}

.dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--text-faint);
}
.dot.on { background: var(--ok); }
.roster li.agent { color: var(--agent); }

.roster li.group {
  margin-top: 8px;
  padding: 0 8px 1px;
  color: var(--text-faint);
  font-size: 0.667rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.roster li.group:first-child { margin-top: 0; }

.who { display: flex; align-items: baseline; gap: 6px; min-width: 0; }
.handle {
  color: var(--text-faint);
  font-size: 0.733rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.me {
  border-top: 1px solid var(--line);
  padding: 10px 16px 12px;
}
.me-id { display: flex; flex-direction: column; gap: 3px; }
.me-name { font-size: 0.933rem; font-weight: 600; }

.badge {
  align-self: flex-start;
  padding: 1px 6px;
  border: 1px solid var(--agent);
  border-radius: 999px;
  color: var(--agent);
  font-size: 0.667rem;
  letter-spacing: 0.03em;
}

.link {
  margin-top: 8px;
  padding: 0;
  background: none;
  border: 0;
  color: var(--text-faint);
  font: inherit;
  font-size: 0.8rem;
  text-decoration: underline;
  cursor: pointer;
}
.link:hover { color: var(--text-dim); }

/* --------------------------------------------------------------- main */

.main {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 0;
  min-width: 0;
}

.channel-head {
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
}
.channel-head h1 { margin: 0; font-size: 1.067rem; }
.channel-head p { margin: 3px 0 0; font-size: 0.867rem; color: var(--text-dim); }
.repo { display: inline-block; margin-top: 5px; font-size: 0.8rem; color: var(--accent); text-decoration: none; }
.repo:hover { text-decoration: underline; }

.messages {
  overflow-y: auto;
  padding: 18px 24px 8px;
  min-height: 0;
}

.empty { color: var(--text-faint); font-size: 0.933rem; padding: 24px 0; }

.msg-row { display: flex; gap: 11px; padding: 3px 0; }
.msg-row.fresh { margin-top: 14px; }

.avatar {
  width: 2.13rem;
  height: 2.13rem;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: var(--bg-raise);
  color: var(--text-dim);
  font-size: 0.867rem;
  font-weight: 700;
}
.msg-row.by-agent .avatar { background: #2a2140; color: var(--agent); }
.msg-row.continued .avatar { visibility: hidden; height: 0; }

.msg-body { min-width: 0; flex: 1; }

.msg-head { display: flex; align-items: baseline; gap: 8px; }
.author { font-weight: 600; font-size: 0.933rem; }
.by-agent .author { color: var(--agent); }
.time { font-size: 0.733rem; color: var(--text-faint); }
.tag {
  padding: 0 5px;
  border-radius: 4px;
  background: var(--bg-raise);
  color: var(--text-faint);
  font-size: 0.667rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.text { overflow-wrap: anywhere; }
.text p { margin: 2px 0; }
.text a { color: var(--accent); }

.text code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--bg-raise);
  font-family: var(--mono);
  font-size: 0.833rem;
}

.text pre {
  margin: 7px 0;
  padding: 11px 13px;
  overflow-x: auto;
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.text pre code { padding: 0; background: none; font-size: 0.833rem; line-height: 1.5; }

.mention { color: var(--agent); font-weight: 600; }

.thinking { color: var(--text-faint); font-style: italic; }
.thinking::after {
  content: "";
  animation: dots 1.4s steps(4, end) infinite;
}
@keyframes dots {
  0%   { content: ""; }
  25%  { content: "."; }
  50%  { content: ".."; }
  75%  { content: "..."; }
}

.errored { color: var(--danger); }

.usage { margin-top: 5px; font-size: 0.733rem; color: var(--text-faint); }

/* --------------------------------------------------------------- composer */

.composer {
  margin: 0 24px 20px;
  padding: 9px 11px;
  background: var(--bg-side);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.composer:focus-within { border-color: var(--accent); }

.composer textarea {
  display: block;
  width: 100%;
  max-height: 220px;
  padding: 0;
  background: none;
  border: 0;
  resize: none;
  color: var(--text);
  font: inherit;
}
.composer textarea:focus { outline: none; }

.composer-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 7px;
}

.hint { font-size: 0.8rem; color: var(--text-faint); }
.hint.err { color: var(--danger); }
.hint .mention { color: var(--agent); }

.composer button {
  padding: 5px 15px;
  background: var(--accent);
  color: #10131a;
  border: 0;
  border-radius: 6px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.composer button:disabled { opacity: 0.45; cursor: default; }

@media (max-width: 720px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}

/* ------------------------------------------------------ interface size */

.fontpick {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 9px;
  color: var(--text-faint);
  font-size: 0.733rem;
}

.fontpick select {
  flex: 1;
  min-width: 0;
  padding: 2px 4px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--text-dim);
  font: inherit;
  cursor: pointer;
}
.fontpick select:focus { outline: 1px solid var(--accent); }

/* -------------------------------------------------- rich message content */

.text h3, .text h4, .text h5, .text h6 {
  margin: 12px 0 4px;
  font-size: 1rem;
  font-weight: 650;
  line-height: 1.3;
}
.text h3 { font-size: 1.07rem; }
.text > *:first-child { margin-top: 0; }

.text ul, .text ol { margin: 4px 0; padding-left: 1.4em; }
.text li { margin: 2px 0; }

.text blockquote {
  margin: 7px 0;
  padding: 2px 0 2px 11px;
  border-left: 2px solid var(--line);
  color: var(--text-dim);
}

.text hr { margin: 12px 0; border: 0; border-top: 1px solid var(--line); }

/* Tables scroll inside their own box rather than widening the message column. */
.table-wrap { overflow-x: auto; margin: 9px 0; }

.text table {
  border-collapse: collapse;
  font-size: 0.867rem;
  min-width: 100%;
}
.text th, .text td {
  padding: 5px 11px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.text th {
  background: var(--bg-raise);
  font-weight: 650;
  white-space: nowrap;
}

/* Maths. KaTeX brings its own sizing; these only place it in the flow. */
.text .katex { font-size: 1.05em; }
.text .katex-display { margin: 10px 0; overflow-x: auto; overflow-y: hidden; }
.math-raw { color: var(--agent); }