:root {
  color-scheme: dark;
  --bg: #10100e;
  --panel: #181815;
  --panel-2: #20201c;
  --ink: #efeee8;
  --muted: #aaa69a;
  --subtle: #706c61;
  --line: #34332e;
  --line-strong: #565247;
  --accent: #d8b45d;
  --accent-2: #8bb7a5;
  --danger: #d36a5f;
  --focus: #e1c878;
  --mono: "Cascadia Mono", "Consolas", "SFMono-Regular", monospace;
  --sans: "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  letter-spacing: 0;
}

button, input { font: inherit; }

button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #24231f;
  color: var(--ink);
  cursor: pointer;
}

button:hover { border-color: var(--line-strong); background: #2c2a25; }

.app-shell {
  display: grid;
  grid-template-columns: 300px minmax(520px, 1fr) 340px;
  grid-template-rows: 72px calc(100vh - 72px);
  min-height: 100vh;
}

.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid var(--line);
  background: #141412;
}

.brand { display: flex; align-items: center; gap: 14px; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 2px solid var(--ink);
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 800;
}

.brand h1 { margin: 0; font-size: 18px; line-height: 1.25; }
.brand p { margin: 3px 0 0; color: var(--muted); font-size: 12px; }

.status-line {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 13px;
}

.sidebar, .inspector, .workspace {
  min-height: 0;
  overflow: hidden;
}

.sidebar, .inspector {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 12px;
  background: #11110f;
}

.sidebar { border-right: 1px solid var(--line); }
.inspector { border-left: 1px solid var(--line); }

.panel {
  min-height: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

.panel-title {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--accent);
  font-size: 12px;
  font-family: var(--mono);
  letter-spacing: .04em;
}

.docs-panel { flex: 0 0 auto; }
.search-panel { flex: 1 1 32%; display: flex; flex-direction: column; }
.nav-panel { flex: 1 1 42%; display: flex; flex-direction: column; }
.index-panel { height: 100%; display: flex; flex-direction: column; }

.doc-list, .search-results, .heading-list, .index-content {
  overflow: auto;
  padding: 8px;
}

.doc-button, .search-hit, .heading-link, .index-link {
  display: block;
  width: 100%;
  margin: 0 0 6px;
  padding: 9px 10px;
  text-align: left;
  background: transparent;
}

.doc-button.active {
  border-color: var(--accent);
  background: rgba(216, 180, 93, .10);
}

.doc-button strong, .search-hit strong, .index-link strong {
  display: block;
  font-size: 13px;
}

.doc-button span, .search-hit span, .index-link span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.search-input {
  width: calc(100% - 16px);
  margin: 8px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #10100e;
  color: var(--ink);
  outline: none;
}

.search-input:focus { border-color: var(--focus); }

.workspace {
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.014) 1px, transparent 1px),
    var(--bg);
  background-size: 18px 18px;
}

.doc-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  min-height: 54px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--line);
  background: rgba(20, 20, 18, .94);
}

.doc-meta strong { display: block; font-size: 14px; }
.doc-meta span { display: block; margin-top: 2px; color: var(--muted); font-size: 12px; }

.toolbar-actions { display: flex; gap: 8px; }
.ghost-btn, .primary-btn { padding: 8px 11px; }
.primary-btn { border-color: #8d7438; background: #3a3322; color: #f4df9c; }

.preview-pane {
  min-height: 0;
  overflow: auto;
  padding: 22px 28px 60px;
}

.markdown-view {
  max-width: 1120px;
  margin: 0 auto;
  color: #e8e5dc;
  line-height: 1.78;
  font-size: 15px;
}

.markdown-view h1, .markdown-view h2, .markdown-view h3, .markdown-view h4 {
  line-height: 1.35;
  scroll-margin-top: 70px;
}

.markdown-view h1 {
  margin: 0 0 22px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--accent);
  font-size: 30px;
}

.markdown-view h2 {
  margin: 34px 0 14px;
  padding-left: 10px;
  border-left: 4px solid var(--accent);
  font-size: 22px;
}

.markdown-view h3 { margin: 26px 0 10px; color: #f2d98d; font-size: 18px; }
.markdown-view h4 { margin: 20px 0 8px; color: #d6d0be; font-size: 16px; }
.markdown-view p { margin: 8px 0; }
.markdown-view ul, .markdown-view ol { padding-left: 1.5em; }
.markdown-view li { margin: 4px 0; }

.markdown-view blockquote {
  margin: 12px 0;
  padding: 10px 14px;
  border-left: 3px solid var(--accent-2);
  background: rgba(139, 183, 165, .08);
  color: #d4d2ca;
}

.markdown-view code {
  padding: 2px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #171713;
  color: #f2d98d;
  font-family: var(--mono);
  font-size: .92em;
}

.markdown-view pre {
  overflow: auto;
  padding: 14px;
  border: 1px solid var(--line);
  background: #141411;
}

.markdown-view pre code { border: 0; padding: 0; background: transparent; }

.markdown-view table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 13px;
}

.markdown-view th, .markdown-view td {
  border: 1px solid var(--line);
  padding: 7px 9px;
  vertical-align: top;
}

.markdown-view th { background: #222018; color: #f0d890; text-align: left; }
.markdown-view mark { background: #6a5320; color: #fff3c2; padding: 0 2px; }

.tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  padding: 8px;
  border-bottom: 1px solid var(--line);
}

.tabs button { padding: 7px 6px; font-size: 12px; }
.tabs button.active { border-color: var(--accent); color: #f2d98d; }

.heading-link.level-1 { color: #f4df9c; }
.heading-link.level-2 { padding-left: 18px; }
.heading-link.level-3, .heading-link.level-4 { padding-left: 30px; color: var(--muted); }

.empty {
  padding: 12px;
  color: var(--subtle);
  font-size: 13px;
  line-height: 1.55;
}

@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto;
  }

  .topbar, .sidebar, .workspace, .inspector {
    grid-column: 1;
    border-left: 0;
    border-right: 0;
  }

  .sidebar, .inspector {
    max-height: none;
    overflow: visible;
  }

  .preview-pane { padding: 16px; }
  .markdown-view { font-size: 14px; }
}