:root {
  color-scheme: dark;
  --bg: #0a0d12;
  --panel: #11161e;
  --panel-2: #171e28;
  --line: #263142;
  --text: #f3f6fb;
  --muted: #9aa8ba;
  --accent: #8db7ff;
  --radius: 14px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.85rem;
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

button.primary {
  background: var(--text);
  color: var(--bg);
  border-color: transparent;
  font-weight: 700;
}

.topbar {
  min-height: 64px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 14px;
  align-items: center;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 13, 18, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  color: var(--text);
  font-weight: 900;
  text-decoration: none;
  letter-spacing: 0.06em;
}

.muted,
.status {
  color: var(--muted);
}

.topbar .muted {
  display: block;
  font-size: 0.78rem;
}

.workspace {
  min-height: calc(100vh - 64px);
  display: grid;
  grid-template-columns: minmax(220px, 0.85fr) minmax(0, 2.4fr) minmax(220px, 0.9fr);
}

.sidebar,
.context-pane,
.editor-pane {
  min-width: 0;
}

.sidebar,
.context-pane {
  background: var(--panel);
  padding: 14px;
}

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

.context-pane {
  border-left: 1px solid var(--line);
}

.search span,
.eyebrow {
  display: block;
  margin: 0 0 0.45rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.search input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.72rem;
  background: var(--bg);
  color: var(--text);
}

.sidebar-actions {
  margin: 10px 0;
}

.note-list,
.relation-list {
  display: grid;
  gap: 6px;
}

.note-link {
  width: 100%;
  text-align: left;
  background: transparent;
  border-color: transparent;
}

.note-link:hover,
.note-link.active {
  background: var(--panel-2);
  border-color: var(--line);
}

.editor-pane {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: calc(100vh - 64px);
}

.editor-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.note-path {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#editor {
  width: 100%;
  min-height: 50vh;
  resize: none;
  border: 0;
  outline: 0;
  padding: clamp(18px, 3vw, 42px);
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.status {
  padding: 10px 16px;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

.context-pane section + section {
  margin-top: 24px;
}

.missing-link {
  color: var(--muted);
  padding: 0.45rem 0.2rem;
}

.principle {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  background: var(--panel-2);
}

.principle p:last-child {
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 0;
}

@media (max-width: 860px) {
  .workspace {
    grid-template-columns: minmax(180px, 34vw) 1fr;
  }

  .context-pane {
    display: none;
  }
}

@media (max-width: 620px) {
  .topbar {
    grid-template-columns: auto 1fr auto;
  }

  .topbar .muted {
    display: none;
  }

  .workspace {
    display: block;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    max-height: 34vh;
    overflow: auto;
  }

  .note-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .editor-pane {
    min-height: 66vh;
  }

  #editor {
    min-height: 52vh;
  }
}