:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --line: #d5d9d0;
  --ink: #1d2a20;
  --muted: #5b6a5e;
  --accent: #2f6f52;
  --accent-soft: #dbeade;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at top, #eef5ed, var(--bg) 40%);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

.topbar {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--line);
  background: #fcfcfb;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.2px;
}

#search {
  width: min(440px, 55vw);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
  background: var(--surface);
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: calc(100vh - 56px);
}

.sidebar {
  border-right: 1px solid var(--line);
  padding: 14px;
  min-height: 0;
  overflow-y: auto;
  background: #f8faf7;
}

.group {
  margin: 0 0 12px 0;
}

.group-title {
  margin: 0 0 8px 0;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.item {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  padding: 8px 10px;
  margin: 0 0 4px 0;
  color: var(--ink);
  cursor: pointer;
}

.item:hover {
  border-color: var(--line);
  background: #ffffff;
}

.item.active {
  background: var(--accent-soft);
  border-color: #b8cfbc;
}

.item-id {
  display: inline-block;
  min-width: 52px;
  color: var(--muted);
  font-size: 12px;
}

.content {
  padding: 20px;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.doc-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 10px;
}

.markdown-body {
  max-width: 980px;
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
}

.markdown-body code,
.markdown-body pre code {
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.markdown-body pre code.hljs {
  border: 1px solid #d7ddd1;
  border-radius: 8px;
  padding: 14px 16px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: 260px 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: none;
  }

  #search {
    width: 60vw;
  }

  .content {
    padding: 12px;
  }

  .markdown-body {
    padding: 16px;
  }
}