:root {
  --bg: #fafafa;
  --panel: #ffffff;
  --sidebar: #f4f5f7;
  --border: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --hover: #eef2ff;
  --active: #dbeafe;
  --radius: 8px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; cursor: pointer; }
a { color: inherit; }

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100vh;
}

/* ---------------- Sidebar ---------------- */
.sidebar {
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.owner-only { display: none; }
body.is-owner .owner-only { display: revert; }
body.is-owner .bm-actions,
body.is-owner .node .actions { display: flex; }

.account {
  border-top: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--muted);
  background: var(--sidebar);
}
.account .avatar {
  width: 24px; height: 24px;
  border-radius: 50%;
  object-fit: cover;
  background: #d1d5db;
}
.account .who {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.account button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--muted);
}
.account button:hover { color: var(--accent); border-color: var(--accent); }
.account .badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--hover);
  color: var(--accent);
  font-size: 10px;
  margin-left: 4px;
}

.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 16px 12px;
}
.brand h1 {
  font-size: 17px;
  margin: 0;
  letter-spacing: 0.5px;
}

.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-size: 12px;
}
.ghost:hover { background: var(--hover); color: var(--accent); border-color: var(--accent); }

#search {
  margin: 0 16px 12px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: white;
  font-size: 13px;
  outline: none;
}
#search:focus { border-color: var(--accent); }

.tree {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 16px;
}

.node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  margin: 1px 0;
}
.node:hover { background: var(--hover); }
.node.active { background: var(--active); color: var(--accent); font-weight: 500; }
.node.sub { padding-left: 26px; font-size: 13px; }

.node .name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.node .actions {
  display: none;
  gap: 4px;
}
body.is-owner .node:hover .actions { display: flex; }
.node .actions button {
  background: transparent;
  border: none;
  color: var(--muted);
  padding: 2px 4px;
  font-size: 12px;
  border-radius: 4px;
}
.node .actions button:hover { background: rgba(0,0,0,0.06); color: var(--text); }
.node.active .actions button { color: var(--accent); }

/* ---------------- Content ---------------- */
.content {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg);
}

.content-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.crumb {
  font-size: 15px;
  font-weight: 500;
}

.primary {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  padding: 7px 14px;
  font-size: 13px;
}
.primary:hover { background: var(--accent-hover); }

.bookmarks {
  list-style: none;
  margin: 0;
  padding: 12px 28px 28px;
  overflow-y: auto;
  flex: 1;
}

.bm {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 10px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  transition: border-color .15s;
}
.bm:hover { border-color: #cbd5e1; }

.bm-main { min-width: 0; }
.bm-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  display: inline-block;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bm-title:hover { color: var(--accent); text-decoration: underline; }

.bm-meta {
  font-size: 12px;
  color: var(--muted);
  margin-top: 3px;
  display: flex;
  gap: 10px;
  align-items: center;
}
.bm-host { color: var(--accent); }
.bm-cat {
  background: var(--hover);
  color: var(--accent);
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11px;
}

.bm-desc {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.bm-actions {
  display: none;
  flex-direction: column;
  gap: 4px;
  align-items: flex-end;
  opacity: 0;
  transition: opacity .15s;
}
body.is-owner .bm:hover .bm-actions { opacity: 1; }
.bm-actions button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--muted);
}
.bm-actions button:hover { color: var(--accent); border-color: var(--accent); background: var(--hover); }
.bm-actions button.del:hover { color: var(--danger); border-color: var(--danger); background: #fef2f2; }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 60px 20px;
  font-size: 14px;
}
.hidden { display: none; }

/* ---------------- Dialog ---------------- */
dialog {
  border: none;
  border-radius: 12px;
  padding: 0;
  box-shadow: 0 20px 50px rgba(0,0,0,0.18);
  width: 420px;
  max-width: 90vw;
  background: var(--panel);
  color: var(--text);
}
dialog::backdrop { background: rgba(0,0,0,0.35); }

dialog form {
  padding: 22px 24px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
dialog h3 { margin: 0 0 4px; font-size: 16px; }

dialog label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 13px;
  color: var(--muted);
}
dialog input,
dialog textarea,
dialog select {
  font: inherit;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: white;
  color: var(--text);
  outline: none;
}
dialog input:focus,
dialog textarea:focus,
dialog select:focus { border-color: var(--accent); }
dialog textarea { resize: vertical; min-height: 60px; font-family: inherit; }

dialog menu {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}
dialog menu button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 13px;
}
dialog menu button:hover { background: var(--hover); }
dialog menu button.primary { background: var(--accent); color: white; border-color: var(--accent); }
dialog menu button.primary:hover { background: var(--accent-hover); }