:root {
  --bg: #0c0e14;
  --bg-2: #131722;
  --bg-3: #1a1f2e;
  --border: #232a3a;
  --text: #e6e8ef;
  --text-dim: #8a93a8;
  --text-faint: #5a6378;
  --accent: #6d9eff;
  --accent-2: #4880e8;
  --warn: #ffb547;
  --ok: #6fcf97;
  --err: #ff6b6b;
  --code-bg: #060810;
  --user-bg: #1d2435;
  --assistant-bg: #131722;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  height: 100vh;
  overflow: hidden;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  font-size: 22px;
  color: var(--accent);
}

h1 {
  font-size: 17px;
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.badge {
  font-family: var(--mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--bg-3);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge.ok { color: var(--ok); }
.badge.err { color: var(--err); }

.header-actions { display: flex; gap: 8px; }

button {
  background: var(--bg-3);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-family: var(--sans);
  cursor: pointer;
  transition: all 0.12s;
}
button:hover {
  background: var(--border);
  border-color: var(--accent);
}
button:active { transform: translateY(1px); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

main {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0;
  overflow: hidden;
}
@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .sources { display: none; }
}

.messages {
  overflow-y: auto;
  padding: 24px 32px;
  scroll-behavior: smooth;
}

.welcome {
  max-width: 640px;
  margin: 40px auto;
  text-align: center;
}
.welcome h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 12px;
}
.welcome p {
  color: var(--text-dim);
  font-size: 14px;
}

.example-queries {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}
.example {
  font-size: 12px;
  padding: 6px 12px;
  background: var(--bg-2);
}

.message {
  max-width: 820px;
  margin: 0 auto 20px;
  padding: 16px 20px;
  border-radius: 10px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-wrap: break-word;
}
.message.user {
  background: var(--user-bg);
  border-color: #2a3550;
}
.message.assistant {
  background: var(--assistant-bg);
}
.message.error {
  background: rgba(255, 107, 107, 0.08);
  border-color: var(--err);
  color: var(--err);
}

.message-role {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  margin-bottom: 6px;
  font-weight: 600;
}
.message-content {
  font-size: 14.5px;
  line-height: 1.65;
}
.message-content code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--code-bg);
  padding: 2px 5px;
  border-radius: 3px;
}
.message-content pre {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--code-bg);
  padding: 12px 14px;
  border-radius: 6px;
  overflow-x: auto;
  border: 1px solid var(--border);
}

.message-meta {
  display: flex;
  gap: 12px;
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 10px;
  font-family: var(--mono);
}

.sources {
  background: var(--bg-2);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px 20px;
}
.sources h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  margin: 0 0 14px;
  font-weight: 600;
}

.source {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  margin-bottom: 10px;
  font-size: 12.5px;
  cursor: pointer;
  transition: border-color 0.12s;
}
.source:hover { border-color: var(--accent); }
.source-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 10px;
  color: var(--text-faint);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.source-similarity {
  background: var(--border);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent);
}
.source-snippet {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 14px 24px 12px;
}
#chat-form {
  display: flex;
  gap: 10px;
  max-width: 1100px;
  margin: 0 auto;
}
#chat-input {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-family: var(--sans);
  font-size: 14.5px;
  resize: none;
  max-height: 200px;
  outline: none;
  transition: border-color 0.12s;
}
#chat-input:focus { border-color: var(--accent); }
#send-btn {
  padding: 0 24px;
  background: var(--accent-2);
  color: white;
  border-color: var(--accent-2);
  font-weight: 500;
}
#send-btn:hover { background: var(--accent); }

.hint {
  text-align: center;
  font-size: 11px;
  color: var(--text-faint);
  margin-top: 8px;
  font-family: var(--mono);
}
.hint a { color: var(--text-dim); text-decoration: none; }
.hint a:hover { color: var(--accent); }

.cursor {
  display: inline-block;
  width: 8px;
  height: 14px;
  background: var(--accent);
  margin-left: 2px;
  animation: blink 1s infinite;
  vertical-align: middle;
}
@keyframes blink { 50% { opacity: 0; } }