:root {
  --bg: #f7f7f5;
  --panel: #ffffff;
  --panel-2: #f0efec;
  --border: #e0ded8;
  --text: #23211d;
  --muted: #6f6a61;
  --accent: #9a5b3d;
  --accent-soft: #f2e7e0;
  --code-bg: #f3f1ed;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  --radius: 10px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1917;
    --panel: #23221f;
    --panel-2: #2b2926;
    --border: #3a3835;
    --text: #eae7e1;
    --muted: #a09a90;
    --accent: #d99b78;
    --accent-soft: #3a2c24;
    --code-bg: #2b2926;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
}

body { display: flex; }

/* ---------------------------------------------------------------- sidebar */

.sidebar {
  width: 280px;
  flex: 0 0 280px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.sidebar-head { padding: 18px 16px 12px; border-bottom: 1px solid var(--border); }
.sidebar-head h1 { margin: 0 0 12px; font-size: 15px; letter-spacing: 0.02em; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 9px 14px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
}
.btn-primary:hover { filter: brightness(1.07); }
.btn-primary:disabled { opacity: 0.5; cursor: default; }

.conversations { flex: 1; overflow-y: auto; padding: 8px; }

.conv {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text);
}
.conv:hover { background: var(--panel-2); }
.conv.active { background: var(--accent-soft); }
.conv-title {
  flex: 1;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.conv-delete {
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  padding: 2px 4px;
  border-radius: 4px;
  opacity: 0;
}
.conv:hover .conv-delete { opacity: 1; }
.conv-delete:hover { background: var(--border); color: var(--text); }

.sidebar-foot {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  font-size: 11.5px;
  color: var(--muted);
  line-height: 1.5;
}

/* ------------------------------------------------------------------- main */

.main { flex: 1; display: flex; flex-direction: column; height: 100vh; min-width: 0; }

.menu-toggle {
  display: none;
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 5;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 16px;
  padding: 6px 10px;
  cursor: pointer;
}

.thread { flex: 1; overflow-y: auto; padding: 32px 24px 8px; }
.thread > * { max-width: 780px; margin-inline: auto; }

.welcome { padding: 8vh 0 0; }
.welcome h2 { font-size: 22px; margin: 0 0 8px; font-weight: 600; }
.welcome p { color: var(--muted); margin: 0 0 24px; max-width: 52ch; }

.examples { display: grid; gap: 8px; }
.example {
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 11px 14px;
  font: inherit;
  font-size: 13.5px;
  color: var(--text);
  cursor: pointer;
}
.example:hover { border-color: var(--accent); }

/* ------------------------------------------------------------------ turns */

.turn { margin-bottom: 30px; }

.question {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 14px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.activity {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  margin-bottom: 14px;
  font-size: 13px;
  overflow: hidden;
}
.activity summary {
  cursor: pointer;
  padding: 9px 14px;
  color: var(--muted);
  list-style: none;
}
.activity summary::-webkit-details-marker { display: none; }
.activity summary::before { content: "▸ "; }
.activity[open] summary::before { content: "▾ "; }
.activity ul { margin: 0; padding: 0 14px 12px 32px; color: var(--muted); }
.activity li { margin: 3px 0; }
.activity code { font-size: 12px; }

.answer { overflow-wrap: anywhere; }
.answer > *:first-child { margin-top: 0; }
.answer h2 { font-size: 16px; margin: 22px 0 8px; }
.answer h3 { font-size: 14.5px; margin: 18px 0 6px; }
.answer p, .answer ul, .answer ol { margin: 0 0 12px; }
.answer ul, .answer ol { padding-left: 24px; }
.answer li { margin: 4px 0; }
.answer code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.32em;
}
.answer pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  overflow-x: auto;
}
.answer pre code { background: none; border: 0; padding: 0; }
.answer blockquote {
  margin: 0 0 12px;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--border);
  color: var(--muted);
}
.answer a { color: var(--accent); }
.answer table { border-collapse: collapse; margin: 0 0 14px; font-size: 13.5px; display: block; overflow-x: auto; }
.answer th, .answer td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.answer th { background: var(--panel-2); }
.answer hr { border: 0; border-top: 1px solid var(--border); margin: 20px 0; }

.cursor::after {
  content: "▍";
  color: var(--accent);
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.sources { margin-top: 14px; font-size: 13px; }
.sources-label { color: var(--muted); margin-bottom: 6px; }
.source {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 12px;
  margin: 0 6px 6px 0;
  text-decoration: none;
  color: var(--text);
}
.source:hover { border-color: var(--accent); }
.source-path { color: var(--muted); font-family: var(--mono); font-size: 11px; }

.usage { margin-top: 10px; font-size: 11.5px; color: var(--muted); font-family: var(--mono); }

.error {
  background: #fdecea;
  border: 1px solid #f3b8b2;
  color: #8a231b;
  border-radius: var(--radius);
  padding: 11px 14px;
  font-size: 13.5px;
}
@media (prefers-color-scheme: dark) {
  .error { background: #3a1f1c; border-color: #6b3630; color: #f0b8b0; }
}

/* --------------------------------------------------------------- composer */

.composer {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  padding: 14px 24px 20px;
  max-width: 828px;
  width: 100%;
  margin-inline: auto;
}
.composer textarea {
  flex: 1;
  resize: none;
  max-height: 200px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  box-shadow: var(--shadow);
}
.composer textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.composer .btn-primary { width: auto; flex: 0 0 auto; }

@media (max-width: 820px) {
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 10;
    transform: translateX(-100%);
    transition: transform 0.18s ease;
  }
  .sidebar.open { transform: none; }
  .menu-toggle { display: block; }
  .thread { padding-top: 56px; }
}