:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --line: #dfe6e2;
  --ink: #17211d;
  --muted: #627067;
  --brand: #0f8f6f;
  --bg: #f5f7f4;
  --panel: #ffffff;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); }
button, input, textarea, select { font: inherit; }
button {
  border: 0;
  background: var(--brand);
  color: white;
  border-radius: 6px;
  padding: 10px 14px;
  cursor: pointer;
}
button:hover { filter: brightness(0.96); }
input, textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 9px 10px;
  background: white;
  color: var(--ink);
}
label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }

.hidden { display: none !important; }
.shell { min-height: 100vh; }
.login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.panel {
  width: min(360px, 100%);
  display: grid;
  gap: 14px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}
.panel h1 { margin: 0 0 6px; }
.error { min-height: 20px; color: #b42318; margin: 0; }

.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
}
.sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel);
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
}
.brand, .sitebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px;
  border-bottom: 1px solid var(--line);
}
.brand h1 { margin: 0; font-size: 20px; }
.brand button, .sitebar button { background: #edf3ef; color: var(--ink); }
.switch { display: flex; align-items: center; gap: 8px; }
.switch input { width: auto; }

.conversation-list { overflow: auto; }
.conversation-item {
  width: 100%;
  text-align: left;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: white;
  color: var(--ink);
  border-radius: 0;
  padding: 12px 14px;
  display: grid;
  gap: 5px;
}
.conversation-item.active { background: #eaf6f1; }
.conversation-item.fresh { animation: pulse 1.2s ease-in-out 4; }
.row { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.status {
  font-size: 12px;
  color: white;
  background: #456257;
  border-radius: 999px;
  padding: 2px 8px;
}
.snippet, .preview, .meta { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.conversation { display: grid; grid-template-rows: auto minmax(0, 1fr) auto auto; min-width: 0; }
.conversation-header {
  min-height: 74px;
  padding: 16px 20px;
  background: white;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
}
.conversation-header h2 { margin: 0 0 5px; font-size: 20px; }
.conversation-header p { margin: 0; color: var(--muted); font-size: 13px; }
.conversation-header select { width: 150px; align-self: start; }
.messages {
  overflow: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.message {
  max-width: min(680px, 86%);
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: white;
}
.message.admin { align-self: flex-end; background: #ecf8f3; border-color: #c7e8dc; }
.message .by { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.message p { margin: 0; white-space: pre-wrap; }
.message a { color: var(--brand); display: inline-block; margin-top: 6px; }
.typing { padding: 0 20px 10px; color: var(--brand); font-size: 13px; }
.reply {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 14px;
  background: white;
  border-top: 1px solid var(--line);
}

.settings {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(430px, 100%);
  overflow: auto;
  background: white;
  border-left: 1px solid var(--line);
  padding: 16px;
  box-shadow: -12px 0 30px rgb(0 0 0 / 12%);
}
.settings-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.settings h2 { margin: 0 0 12px; }
.settings h3 { margin: 20px 0 8px; }
.settings form { display: grid; gap: 12px; }
pre {
  white-space: pre-wrap;
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7faf8;
}

@keyframes pulse {
  0%, 100% { background: white; }
  50% { background: #dff7eb; }
}

@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { min-height: 42vh; border-right: 0; border-bottom: 1px solid var(--line); }
  .conversation { min-height: 58vh; }
}