:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1f2329;
  --muted: #6b7280;
  --line: #e5e7eb;
  --brand: #2f6df0;
  --brand-soft: #eaf1ff;
  --chip: #eef2f7;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  display: flex;
  flex-direction: column;
}
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; font-size: 17px; white-space: nowrap; }
.brand .sub { font-size: 12px; color: var(--muted); font-weight: 400; }
.search { position: relative; flex: 1; max-width: 480px; }
.search input {
  width: 100%; padding: 9px 12px; border: 1px solid var(--line);
  border-radius: 10px; font-size: 14px; outline: none;
}
.search input:focus { border-color: var(--brand); }
.search-results {
  position: absolute; top: 44px; left: 0; right: 0;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.08);
  max-height: 60vh; overflow: auto; z-index: 20;
}
.sr-item { padding: 9px 12px; border-bottom: 1px solid var(--line); cursor: pointer; }
.sr-item:last-child { border-bottom: none; }
.sr-item b { display: block; font-size: 14px; }
.sr-item span { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; }
.sr-item:hover { background: var(--brand-soft); }

.btn {
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  padding: 8px 14px; border-radius: 10px; font-size: 14px; cursor: pointer; white-space: nowrap;
}
.btn:hover { border-color: var(--brand); }
.btn.primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.btn.primary:hover { filter: brightness(1.05); }

.layout { flex: 1; display: flex; min-height: 0; }
.sidebar {
  width: 280px; min-width: 280px; background: var(--panel);
  border-right: 1px solid var(--line); overflow: auto; padding: 10px 8px;
}
.sidebar-title { font-size: 12px; color: var(--muted); padding: 4px 8px 8px; }
.tree-list { list-style: none; margin: 0; padding-left: 0; }
.tree-list .tree-list { padding-left: 14px; }
.tree-dir {
  padding: 6px 8px; cursor: pointer; border-radius: 8px; font-size: 14px;
  font-weight: 600; color: #374151;
}
.tree-dir:hover { background: var(--brand-soft); }
.tree-file {
  padding: 6px 8px 6px 22px; cursor: pointer; border-radius: 8px; font-size: 14px; color: #1f2329;
}
.tree-file:hover { background: var(--brand-soft); }

.content { flex: 1; overflow: auto; padding: 22px 28px; }
.placeholder { color: var(--muted); padding: 40px 0; text-align: center; }
.file-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.file-head h2 { font-size: 22px; margin: 0; }
.file-actions { display: flex; gap: 8px; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 20px; box-shadow: 0 2px 10px rgba(0,0,0,.03);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.chip {
  background: var(--chip); color: #374151; font-size: 12px;
  padding: 4px 10px; border-radius: 999px;
}
.one-line {
  font-size: 15px; color: #111827; background: var(--brand-soft);
  border-left: 3px solid var(--brand); padding: 10px 12px; border-radius: 8px; margin: 0 0 12px;
}
.src { font-size: 13px; color: var(--muted); margin: 0 0 12px; }

.md { line-height: 1.75; font-size: 15px; }
.md h1, .md h2, .md h3 { margin: 1.1em 0 .5em; line-height: 1.3; }
.md h1 { font-size: 22px; } .md h2 { font-size: 19px; } .md h3 { font-size: 16px; }
.md p { margin: .6em 0; }
.md ul, .md ol { padding-left: 1.4em; }
.md code { background: #f1f3f5; padding: 1px 5px; border-radius: 5px; font-size: 13px; }
.md pre { background: #0f172a; color: #e2e8f0; padding: 12px; border-radius: 10px; overflow: auto; }
.md pre code { background: none; color: inherit; padding: 0; }
.md blockquote { border-left: 3px solid var(--line); margin: .8em 0; padding: .2em 1em; color: var(--muted); }
.md table { border-collapse: collapse; width: 100%; margin: .8em 0; }
.md th, .md td { border: 1px solid var(--line); padding: 6px 10px; }
.md a { color: var(--brand); }

.edit-form { max-width: 760px; }
.edit-form label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 5px; }
.edit-form input, .edit-form textarea {
  width: 100%; padding: 9px 12px; border: 1px solid var(--line);
  border-radius: 10px; font-size: 14px; font-family: inherit; outline: none;
}
.edit-form input:focus, .edit-form textarea:focus { border-color: var(--brand); }
.edit-form textarea { resize: vertical; line-height: 1.6; }

.hidden { display: none !important; }

/* 访问口令弹窗 */
.modal {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 23, 42, .45);
  display: flex; align-items: center; justify-content: center; padding: 20px;
}
.modal-box {
  background: var(--panel); border-radius: 16px; padding: 26px 24px;
  width: 100%; max-width: 360px; box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.modal-box h3 { margin: 0 0 8px; font-size: 18px; }
.modal-tip { margin: 0 0 14px; font-size: 13px; color: var(--muted); line-height: 1.5; }
.modal-box input {
  width: 100%; padding: 11px 13px; border: 1px solid var(--line);
  border-radius: 10px; font-size: 15px; outline: none;
}
.modal-box input:focus { border-color: var(--brand); }
.modal-err { color: #d92d20; font-size: 12px; min-height: 16px; margin: 8px 0 0; }
.modal-actions { margin-top: 14px; display: flex; justify-content: flex-end; }

/* 窄屏 / iPad 竖屏适配 */
@media (max-width: 820px) {
  .sidebar { width: 200px; min-width: 200px; }
  .content { padding: 16px; }
}