* { box-sizing: border-box; }
:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #e3e6eb;
  --border-strong: #c8ccd2;
  --text: #1a1f2b;
  --muted: #5b6373;
  --accent: #1f3a5f;
  --accent-hover: #163050;
  --user-bg: #eef2f8;
  --tool-bg: #fafbfc;
  --tool-border: #e8eaee;
  --error: #a4262c;
}
html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", "Helvetica Neue", system-ui, "Noto Sans Armenian", sans-serif;
  font-size: 14px;
  line-height: 1.5;
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 18px; height: 18px;
  background: var(--accent);
  display: inline-block;
}
.brand h1 {
  margin: 0; font-size: 15px; font-weight: 600; letter-spacing: 0.2px;
}
.status {
  font-size: 12px; color: var(--muted);
  padding: 4px 10px; border: 1px solid var(--border); border-radius: 2px;
  background: #fff;
}
.status.ok { color: #1f7a3d; border-color: #c5e1ce; background: #f1f9f3; }
.status.err { color: var(--error); border-color: #e7c2c4; background: #fdf2f3; }

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: calc(100vh - 53px);
}
.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 20px;
  overflow-y: auto;
}
.sidebar-block { margin-bottom: 22px; }
.sidebar-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--muted); margin-bottom: 8px; font-weight: 600;
}
.muted { color: var(--muted); }
.small { font-size: 12px; }
.examples {
  list-style: none; padding: 0; margin: 0;
}
.examples li {
  padding: 8px 10px; margin-bottom: 4px;
  border: 1px solid var(--border);
  cursor: pointer; background: #fff;
  font-size: 13px; color: var(--text);
}
.examples li:hover { border-color: var(--accent); background: var(--user-bg); }

.chat {
  display: flex; flex-direction: column;
  background: var(--bg);
  height: 100%;
  min-height: 0;
}
.messages {
  flex: 1; overflow-y: auto;
  padding: 24px 32px; max-width: 980px; width: 100%;
  margin: 0 auto;
}
.msg {
  margin-bottom: 18px;
}
.msg .role {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.7px;
  color: var(--muted); margin-bottom: 6px; font-weight: 600;
}
.msg .body {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px 16px;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.msg.user .body {
  background: var(--user-bg);
  border-color: var(--border-strong);
}
.msg.assistant .body {
  background: var(--panel);
}
.body.md p { margin: 0 0 8px; }
.body.md p:last-child { margin-bottom: 0; }
.body.md h1, .body.md h2, .body.md h3 { margin: 12px 0 6px; font-weight: 600; }
.body.md h1 { font-size: 17px; } .body.md h2 { font-size: 15px; } .body.md h3 { font-size: 14px; }
.body.md ul, .body.md ol { margin: 4px 0 8px; padding-left: 22px; }
.body.md li { margin-bottom: 2px; }
.body.md strong { color: #0f1d33; }
.body.md table { border-collapse: collapse; margin: 8px 0; }
.body.md th, .body.md td { border: 1px solid var(--border); padding: 4px 10px; text-align: left; }
.body.md th { background: var(--user-bg); font-weight: 600; }
.body.md code {
  background: #f1f3f6; padding: 1px 5px;
  font-family: "JetBrains Mono", "Consolas", monospace; font-size: 12px;
}
.body.md pre {
  background: #f1f3f6; padding: 8px 12px; overflow-x: auto;
  font-family: "JetBrains Mono", "Consolas", monospace; font-size: 12px;
  margin: 6px 0;
}
.body.md pre code { background: transparent; padding: 0; }
.body.md blockquote {
  border-left: 3px solid var(--border-strong); margin: 6px 0; padding: 2px 12px;
  color: var(--muted);
}
.body.md a { color: var(--accent); }

.steps {
  margin-top: 8px; border: 1px solid var(--tool-border);
  background: var(--tool-bg);
  font-size: 12px;
  font-family: "JetBrains Mono", "Consolas", "SF Mono", monospace;
}
.steps summary {
  padding: 8px 12px; cursor: pointer; color: var(--muted);
  user-select: none;
}
.steps summary:hover { color: var(--accent); }
.steps[open] summary { border-bottom: 1px solid var(--tool-border); }
.step-list { padding: 8px 12px; }
.step {
  padding: 6px 0; border-bottom: 1px dashed var(--tool-border);
  white-space: pre-wrap; word-wrap: break-word;
}
.step:last-child { border-bottom: 0; }
.step .name { color: var(--accent); font-weight: 600; }
.step .args { color: var(--muted); }

.thinking {
  display: inline-block;
  color: var(--muted); font-style: italic;
}
.thinking::after {
  content: "…"; animation: dots 1.2s infinite steps(4);
  display: inline-block; min-width: 18px;
}
@keyframes dots { 0% {content:"";} 25% {content:".";} 50% {content:"..";} 75% {content:"...";} }

.composer {
  display: flex; gap: 8px;
  border-top: 1px solid var(--border);
  background: var(--panel);
  padding: 12px 16px;
  align-items: flex-end;
}
.composer textarea {
  flex: 1; resize: none;
  border: 1px solid var(--border-strong);
  padding: 10px 12px;
  font: inherit; color: var(--text);
  outline: none;
  min-height: 44px; max-height: 200px;
}
.composer textarea:focus { border-color: var(--accent); }
.composer button {
  padding: 10px 22px;
  background: var(--accent); color: #fff;
  border: 1px solid var(--accent);
  font: inherit; font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.3px;
}
.composer button:hover { background: var(--accent-hover); }
.composer button:disabled { opacity: 0.5; cursor: wait; }

.error {
  color: var(--error);
  border-color: #e7c2c4 !important;
  background: #fdf2f3 !important;
}