:root {
  --bg: #f7f7f8;
  --panel: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --border: #e2e2e5;
  --user: #e8f0fe;
  --accent: #2f6fed;
  --accent-text: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --panel: #1f2022;
    --text: #e9e9ea;
    --muted: #9a9a9f;
    --border: #34353800;
    --border: #343538;
    --user: #24354f;
    --accent: #4c8dff;
    --accent-text: #0b0b0c;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap {
  max-width: 820px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  flex-direction: column;
}
header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}
header h1 { font-size: 16px; margin: 0; letter-spacing: .5px; }
header .sub { color: var(--muted); font-size: 12px; }
header form { margin-left: auto; }
.heart {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.heart svg { display: block; overflow: visible; }
.heart svg path {
  fill: var(--accent);
  transform-origin: 16px 17px;
  will-change: transform;
}
.heart b { color: var(--text); font-weight: 600; }
.heart .bpmu { opacity: .6; }
.heart.stale { opacity: .35; }
@media (prefers-reduced-motion: reduce) {
  .heart svg path { transition: opacity .2s linear; }
}
header button {
  background: none; border: 1px solid var(--border); color: var(--muted);
  border-radius: 8px; padding: 5px 10px; cursor: pointer; font-size: 12px;
}
#mempanel {
  border-bottom: 1px solid var(--border);
  padding: 8px 16px;
  font-size: 13px;
}
#mempanel summary { cursor: pointer; color: var(--muted); }
#mempanel #memlist { margin: 8px 0; display: flex; flex-direction: column; gap: 4px; }
#mempanel .mem {
  display: flex; gap: 8px; align-items: baseline;
  padding: 4px 6px; border: 1px solid var(--border); border-radius: 8px;
}
#mempanel .mem span { flex: 1; }
#mempanel .mem .id { flex: none; color: var(--muted); font-variant-numeric: tabular-nums; }
#mempanel .mem button {
  flex: none; background: none; border: none; color: var(--muted);
  cursor: pointer; font-size: 14px; line-height: 1;
}
#mempanel #memform { display: flex; gap: 6px; }
#mempanel #meminput {
  flex: 1; padding: 6px 8px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--panel); color: var(--text); font: inherit;
}
#mempanel #memform button {
  flex: none; width: 34px; border: none; border-radius: 8px;
  background: var(--accent); color: var(--accent-text); font-weight: 700; cursor: pointer;
}
#log {
  flex: 1;
  overflow-y: auto;
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.msg { display: flex; }
.msg .bubble {
  padding: 10px 13px;
  border-radius: 14px;
  max-width: 86%;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.msg.user { justify-content: flex-end; }
.msg.user .bubble { background: var(--user); }
.msg.assistant .bubble { background: var(--panel); border: 1px solid var(--border); }
.msg.error .bubble { background: #b23; color: #fff; }
form#composer {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}
#input {
  flex: 1;
  resize: none;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  max-height: 160px;
}
#send {
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  border-radius: 10px;
  padding: 0 18px;
  font-weight: 600;
  cursor: pointer;
}
#send:disabled { opacity: .5; cursor: default; }

/* Login */
.login {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  width: 100%;
  max-width: 340px;
}
.card h1 { margin: 0 0 4px; font-size: 20px; letter-spacing: 1px; }
.card p { margin: 0 0 18px; color: var(--muted); font-size: 13px; }
.card input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  margin-bottom: 12px;
}
.card button {
  width: 100%;
  padding: 11px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  cursor: pointer;
}
.card .err { color: #d33; font-size: 13px; margin-bottom: 10px; }