:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #e2e5ea;
  --text: #1c1f24;
  --muted: #6b7280;
  --accent: #f38020; /* Cloudflare orange */
  --user-bubble: #1c1f24;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --panel: #1e2128;
    --border: #2e323b;
    --text: #e9eaec;
    --muted: #9aa1ad;
    --user-bubble: #343a45;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.title p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.session {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
}

.session-id {
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.session a {
  color: var(--muted);
}

button {
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

main {
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.message {
  display: flex;
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

.message.user {
  justify-content: flex-end;
}

.bubble {
  padding: 10px 14px;
  border-radius: 14px;
  max-width: 80%;
  background: var(--panel);
  border: 1px solid var(--border);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message.user .bubble {
  background: var(--user-bubble);
  border-color: transparent;
  color: #ffffff;
}

.bubble p {
  margin: 0 0 8px;
}

.bubble p:last-child {
  margin-bottom: 0;
}

.bubble code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: rgba(127, 127, 127, 0.18);
  padding: 1px 5px;
  border-radius: 5px;
}

.sources {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.message.error .bubble {
  border-color: #d33;
  color: #d33;
}

.pending .bubble {
  color: var(--muted);
  font-style: italic;
}

form {
  display: flex;
  gap: 10px;
  padding: 14px 20px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

input {
  flex: 1;
  font: inherit;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

input:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

#send {
  background: var(--accent);
  border-color: var(--accent);
  color: #1c1f24;
  font-weight: 600;
  padding: 10px 20px;
}