:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fb;
  --bg-sidebar: #fbfbfd;
  --border: #e8e9ee;
  --text: #1f2329;
  --text-soft: #6b7280;
  --accent: #4a5bdc;
  --accent-soft: #eef0ff;
  --danger: #e2493b;
  --code-bg: #f3f4f6;
  --shadow: 0 4px 24px rgba(20, 23, 40, 0.12);
}

[data-theme="dark"] {
  --bg: #1b1d23;
  --bg-soft: #20232b;
  --bg-sidebar: #16181e;
  --border: #2a2e38;
  --text: #e6e8ee;
  --text-soft: #9aa0ad;
  --accent: #6c7bff;
  --accent-soft: #2a2f55;
  --danger: #ff6b5e;
  --code-bg: #2a2e38;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
}
.hidden { display: none !important; }

/* ---------------- Login ---------------- */
.login-screen {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--accent-soft), var(--bg));
}
.login-card {
  width: 340px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 14px; padding: 36px 28px; box-shadow: var(--shadow); text-align: center;
}
.login-logo { font-size: 28px; font-weight: 700; color: var(--accent); letter-spacing: -0.5px; }
.login-sub { color: var(--text-soft); margin-bottom: 22px; font-size: 13px; }
#login-form { display: flex; flex-direction: column; gap: 12px; }
#login-form input {
  padding: 11px 13px; border: 1px solid var(--border); border-radius: 9px;
  background: var(--bg-soft); color: var(--text); font-size: 15px;
}
.login-error { color: var(--danger); font-size: 13px; min-height: 16px; }

/* ---------------- Buttons ---------------- */
.btn {
  border: 1px solid var(--border); background: var(--bg-soft); color: var(--text);
  padding: 8px 14px; border-radius: 8px; cursor: pointer; font-size: 14px; transition: .15s;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.danger { color: var(--danger); border-color: transparent; }
.btn.danger:hover { background: var(--danger); color: #fff; }
.btn.ghost { background: transparent; }
.btn.full { width: 100%; }

.icon-btn {
  width: 36px; height: 36px; border: none; background: transparent; cursor: pointer;
  border-radius: 8px; display: inline-flex; align-items: center; justify-content: center;
  color: var(--text-soft);
}
.icon-btn:hover { background: var(--accent-soft); color: var(--accent); }
.icon-btn svg { width: 20px; height: 20px; }

/* ---------------- Layout ---------------- */
.app { display: flex; height: 100vh; }
.sidebar {
  width: 280px; background: var(--bg-sidebar); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 14px 12px; gap: 10px; flex-shrink: 0; min-height: 0;
}
.app.sidebar-collapsed .sidebar { display: none; }
.sidebar-head { display: flex; align-items: center; justify-content: space-between; }
.brand { font-weight: 700; font-size: 18px; color: var(--accent); }
.sidebar-search { position: relative; }
.sidebar-search input {
  width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 9px;
  background: var(--bg-soft); color: var(--text); font-size: 14px;
}
.search-results {
  position: absolute; top: 42px; left: 0; right: 0; background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow);
  max-height: 360px; overflow: auto; z-index: 30; padding: 6px;
}
.search-results .sr-item { padding: 9px 10px; border-radius: 8px; cursor: pointer; }
.search-results .sr-item:hover { background: var(--accent-soft); }
.search-results .sr-title { font-weight: 600; font-size: 14px; }
.search-results .sr-snippet { font-size: 12px; color: var(--text-soft); }
.search-results .sr-arch { font-size: 11px; color: var(--danger); }

.tree { flex: 1; overflow: auto; margin-top: 6px; min-height: 0; }
.tree-node { user-select: none; }
.tree-row {
  display: flex; align-items: center; gap: 4px; padding: 5px 6px; border-radius: 7px;
  cursor: pointer; font-size: 14px;
}
.tree-row:hover { background: var(--accent-soft); }
.tree-row.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.tree-toggle { width: 18px; text-align: center; color: var(--text-soft); cursor: pointer; flex-shrink: 0; }
.tree-add { margin-left: 4px; color: var(--text-soft); cursor: pointer; opacity: 0; flex-shrink: 0; font-size: 15px; padding: 0 4px; border-radius: 5px; }
.tree-row:hover .tree-add { opacity: 1; }
.tree-add:hover { color: var(--accent); background: var(--accent-soft); }
.tree-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-add { width: 18px; text-align: center; color: var(--text-soft); cursor: pointer; opacity: 0; flex-shrink: 0; font-weight: 700; }
.tree-row:hover .tree-add { opacity: 1; }
.tree-add:hover { color: var(--accent); }
.tree-children { margin-left: 16px; border-left: 1px dashed var(--border); padding-left: 4px; }
.tree-archived-label { font-size: 12px; color: var(--text-soft); padding: 10px 6px 4px; text-transform: uppercase; letter-spacing: .5px; }

.sidebar-foot { display: flex; align-items: center; gap: 4px; border-top: 1px solid var(--border); padding-top: 10px; }
.user-badge { flex: 1; font-size: 13px; color: var(--text-soft); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-badge .role { color: var(--accent); font-weight: 600; }

/* ---------------- Content ---------------- */
.content { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-height: 0; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 22px; border-bottom: 1px solid var(--border); gap: 12px;
}
.breadcrumb { font-size: 13px; color: var(--text-soft); display: flex; gap: 6px; flex-wrap: wrap; }
.breadcrumb span.sep { opacity: .5; }
.topbar-actions { display: flex; align-items: center; gap: 8px; }
.editor-actions { display: flex; gap: 6px; }

.page-wrap { flex: 1; overflow: auto; min-height: 0; padding: 26px 40px 80px; max-width: 920px; margin: 0 auto; width: 100%; }
.page-title {
  width: 100%; border: none; background: transparent; color: var(--text);
  font-size: 30px; font-weight: 700; margin-bottom: 14px; outline: none;
}
.page-title::placeholder { color: var(--text-soft); }

.toolbar {
  display: flex; flex-wrap: wrap; gap: 4px; padding: 8px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--bg-soft); margin-bottom: 14px; position: sticky; top: 0; z-index: 10;
}
.toolbar .tbtn {
  border: 1px solid transparent; background: transparent; color: var(--text); cursor: pointer;
  border-radius: 6px; padding: 5px 8px; font-size: 13px; min-width: 30px;
}
.toolbar .tbtn:hover { background: var(--accent-soft); color: var(--accent); }
.toolbar .tsep { width: 1px; background: var(--border); margin: 2px 4px; }
.toolbar select { border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 6px; padding: 4px 6px; }

.editor {
  outline: none; min-height: 300px; border: 1px solid var(--border); border-radius: 10px;
  padding: 18px 20px; background: var(--bg); line-height: 1.7;
}
.editor[contenteditable="true"]:focus { border-color: var(--accent); }
.editor h1, .editor h2, .editor h3 { line-height: 1.3; }
.editor img { max-width: 100%; border-radius: 8px; }
.editor table, .editor pre { border-collapse: collapse; }
.editor table td, .editor table th {
  border: 1px solid var(--border); padding: 6px 10px;
}
.editor pre { background: var(--code-bg); padding: 12px; border-radius: 8px; overflow: auto; }
.editor code { background: var(--code-bg); padding: 2px 5px; border-radius: 4px; }
.editor blockquote { border-left: 3px solid var(--accent); margin: 0; padding-left: 14px; color: var(--text-soft); }

/* read-only view (user) mirrors editor styles */
.editor.view { border: none; padding: 0; }

/* ---------------- AI panel ---------------- */
.ai-panel {
  position: fixed; right: 0; top: 0; bottom: 0; width: 380px; background: var(--bg);
  border-left: 1px solid var(--border); box-shadow: var(--shadow); display: flex; flex-direction: column; z-index: 40;
}
.ai-head { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px; border-bottom: 1px solid var(--border); font-weight: 600; }
.ai-model-label { font-weight: 400; font-size: 12px; color: var(--text-soft); margin-left: 6px; }
.ai-messages { flex: 1; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.ai-msg { padding: 10px 12px; border-radius: 10px; font-size: 14px; max-width: 90%; white-space: pre-wrap; }
.ai-msg.user { background: var(--accent); color: #fff; align-self: flex-end; }
.ai-msg.bot a { color: var(--accent); text-decoration: underline; }
.ai-msg.bot { background: var(--bg-soft); border: 1px solid var(--border); align-self: flex-start; }
.ai-input-row { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--border); }
.ai-input-row textarea { flex: 1; resize: none; height: 44px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-soft); color: var(--text); padding: 8px; font-family: inherit; }

/* ---------------- Modal ---------------- */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.4); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal-card { width: 560px; max-width: 94vw; background: var(--bg); border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; }
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 18px; border-bottom: 1px solid var(--border); font-weight: 600; }
.modal-tabs { display: flex; gap: 6px; padding: 10px 18px 0; }
.tab-btn { border: none; background: transparent; color: var(--text-soft); padding: 8px 12px; cursor: pointer; border-bottom: 2px solid transparent; font-size: 14px; }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.modal-body { padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.modal-body label { font-size: 13px; color: var(--text-soft); }
  .modal-body input, .modal-body select { padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-soft); color: var(--text); font-size: 14px; }
  .ai-curl { width: 100%; min-height: 180px; resize: vertical; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-soft); color: var(--text); font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12.5px; line-height: 1.5; }
  .hint { font-size: 12px; color: var(--text-soft); line-height: 1.5; }
  .hint code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
.modal-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.status { font-size: 13px; }
.users-list { display: flex; flex-direction: column; gap: 8px; max-height: 300px; overflow: auto; }
.user-row { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; }
.user-row .u-name { flex: 1; }
.user-row .u-role { font-size: 12px; color: var(--accent); }

/* ---------------- Toast ---------------- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 10px;
  box-shadow: var(--shadow); z-index: 60; font-size: 14px;
}