:root {
  --bg: #faf7f2;
  --panel: #ffffff;
  --ink: #23201b;
  --muted: #8a8175;
  --leaf: #4b7a4a;
  --leaf-soft: #eaf1e8;
  --user: #4b7a4a;
  --user-ink: #ffffff;
  --bot: #f1ece3;
  --line: #e7e0d5;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
}

.app { max-width: 1000px; margin: 0 auto; padding: 20px 16px; }

.topbar { margin-bottom: 16px; }
.brand { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; }
.leaf { margin-right: 4px; }
.sub { color: var(--muted); font-size: 13px; margin-top: 2px; }

.layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 16px;
  align-items: start;
}

.chat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  height: 72vh;
  overflow: hidden;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  max-width: 78%;
  padding: 10px 14px;
  border-radius: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.msg.assistant { background: var(--bot); align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.user { background: var(--user); color: var(--user-ink); align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.streaming::after {
  content: '▍';
  animation: blink 1s steps(2) infinite;
  color: var(--muted);
}
@keyframes blink { 50% { opacity: 0; } }

.composer {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}
.input {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
}
.input:focus { outline: 2px solid var(--leaf-soft); border-color: var(--leaf); }
.send {
  padding: 0 20px;
  border: none;
  border-radius: 10px;
  background: var(--leaf);
  color: #fff;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
}
.send:disabled { opacity: 0.5; cursor: default; }

.side {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
}
.side h2 { margin: 0 0 12px; font-size: 15px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }

.brief { margin: 0; display: grid; grid-template-columns: 88px 1fr; gap: 8px 10px; }
.brief dt { color: var(--muted); font-size: 13px; }
.brief dd { margin: 0; font-size: 14px; }
.brief dd.empty { color: #c9c0b2; }
.brief dd.filled { color: var(--ink); font-weight: 500; }

.status { margin-top: 14px; font-size: 14px; min-height: 20px; }
.status.done { color: var(--leaf); font-weight: 600; }
.status.human { color: #b26b1e; font-weight: 600; }

.stats {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  .side { order: -1; }
  .chat { height: 60vh; }
}