:root {
  color-scheme: light dark;
  --bg: #f6f7f9; --panel: #fff; --fg: #1f2430; --muted: #5b6270; --border: #e2e5ea;
  --accent: #4f46e5; --accent-fg: #fff; --hover: #f0f1f4; --sel: #eef2ff;
  --danger: #c0362c; --ok: #15803d; --chip: #eef0f3;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 12px 32px rgba(0,0,0,.12);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --panel: #171a20; --fg: #e6e8ee; --muted: #9aa1ae; --border: #272b34;
    --accent: #6366f1; --accent-fg: #fff; --hover: #20242c; --sel: #1e2350;
    --danger: #f2837a; --ok: #4ade80; --chip: #232730;
    --shadow: 0 1px 2px rgba(0,0,0,.5), 0 16px 40px rgba(0,0,0,.55);
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
button, input, select { font: inherit; color: inherit; }
[hidden] { display: none !important; }
.muted { color: var(--muted); font-size: 13px; }
.msg { font-size: 13px; min-height: 18px; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }

/* ---------- auth ---------- */
.auth { min-height: 100%; display: grid; place-items: center; padding: 24px; }
.auth-card {
  width: 100%; max-width: 380px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 16px; padding: 26px 24px; box-shadow: var(--shadow);
}
.auth-card h1 { margin: 0 0 4px; font-size: 20px; }
.auth-card .tabs { display: flex; gap: 6px; margin: 16px 0 10px; }
.tabs button {
  flex: 1; padding: 8px; border: 1px solid var(--border); background: transparent;
  border-radius: 9px; cursor: pointer; font-weight: 600;
}
.tabs button.on { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
.auth-card label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
.auth-card input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 9px;
  background: var(--bg);
}
.primary {
  background: var(--accent); color: var(--accent-fg); border: none; border-radius: 9px;
  padding: 11px; font-weight: 600; cursor: pointer; width: 100%; margin-top: 14px;
}

/* ---------- app shell ---------- */
.app {
  height: 100%; display: grid;
  grid-template-columns: 300px 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas: "top top" "drawer main";
}
.top {
  grid-area: top; display: flex; align-items: center; gap: 10px;
  padding: 0 14px; background: var(--panel); border-bottom: 1px solid var(--border);
}
.top .icon {
  border: 1px solid var(--border); background: var(--panel); border-radius: 9px;
  width: 38px; height: 38px; cursor: pointer; flex-shrink: 0;
}
#menuBtn { display: none; }
#search {
  flex: 1; padding: 9px 13px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg); min-width: 0;
}
.drawer {
  grid-area: drawer; background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.tree { flex: 1; overflow-y: auto; padding: 10px 8px; }
.node {
  display: flex; align-items: center; gap: 6px; padding: 8px 10px; border-radius: 8px;
  cursor: pointer; font-size: 14px;
}
.node:hover { background: var(--hover); }
.node.on { background: var(--sel); }
.node .tw { width: 14px; text-align: center; color: var(--muted); flex-shrink: 0; }
.node .nm { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.node .ct { color: var(--muted); font-size: 12px; }
.node .kids { margin-left: 14px; width: 100%; }
.drawer-foot { border-top: 1px solid var(--border); padding: 8px; display: flex; flex-direction: column; gap: 4px; }
.drawer-foot button {
  text-align: left; border: none; background: transparent; padding: 8px 10px; border-radius: 8px;
  cursor: pointer; color: var(--fg); font-size: 14px;
}
.drawer-foot button.on { background: var(--sel); font-weight: 600; }

.main { grid-area: main; overflow-y: auto; padding: 16px 20px 90px; }
.crumb { color: var(--muted); font-size: 13px; margin-bottom: 12px; display: flex; gap: 6px; flex-wrap: wrap; }
.crumb a { color: var(--accent); cursor: pointer; text-decoration: none; }
.list { max-width: 900px; }
.item {
  display: flex; align-items: center; gap: 12px; padding: 11px 12px; border-radius: 10px;
}
.item:hover { background: var(--hover); }
.item .ico { width: 18px; height: 18px; border-radius: 4px; background: var(--chip); flex-shrink: 0; display: grid; place-items: center; font-size: 13px; }
.item img.ico { object-fit: cover; }
.item .body { flex: 1; min-width: 0; }
.item .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; }
.item .u { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .tags { display: flex; gap: 5px; flex-wrap: wrap; }
.item .tags span { font-size: 11px; background: var(--chip); border-radius: 999px; padding: 2px 9px; }
.item .act { display: flex; gap: 4px; opacity: 0; flex-shrink: 0; }
.item:hover .act, .item:focus-within .act { opacity: 1; }
.item .act button {
  border: none; background: var(--chip); border-radius: 7px; padding: 5px 9px; cursor: pointer;
  font-size: 12px; color: var(--fg);
}
.empty { color: var(--muted); padding: 40px 12px; text-align: center; }

.fab {
  position: fixed; right: 22px; bottom: 22px; width: 56px; height: 56px; border-radius: 50%;
  border: none; background: var(--accent); color: #fff; font-size: 26px; cursor: pointer;
  box-shadow: var(--shadow); z-index: 20;
}
.scrim { position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 15; }
.toast {
  position: fixed; left: 50%; bottom: 92px; transform: translateX(-50%);
  background: var(--fg); color: var(--bg); padding: 11px 18px; border-radius: 11px;
  box-shadow: var(--shadow); font-size: 13px; z-index: 30; display: flex; gap: 14px; align-items: center;
}
.toast[hidden] { display: none !important; }
.toast button { border: none; background: none; color: var(--bg); text-decoration: underline; font-weight: 600; cursor: pointer; }

/* ---------- dialogs ---------- */
dialog {
  border: none; border-radius: 16px; padding: 0; background: var(--panel); color: var(--fg);
  box-shadow: var(--shadow); max-width: 460px; width: 92vw;
}
dialog::backdrop { background: rgba(0,0,0,.45); }
.dlg { padding: 22px 24px; }
.dlg h2 { margin: 0 0 14px; font-size: 18px; }
.dlg label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
.dlg input, .dlg select {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 9px; background: var(--bg);
}
.seg, .dlg .seg { display: flex; gap: 6px; margin-bottom: 6px; }
.seg button {
  flex: 1; padding: 8px; border: 1px solid var(--border); background: transparent; border-radius: 9px;
  cursor: pointer; font-weight: 600;
}
.seg button.on { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
.dlg-foot { display: flex; justify-content: flex-end; gap: 8px; margin: 18px 0 0; padding: 0; }
.dlg-foot button { padding: 9px 16px; border-radius: 9px; border: 1px solid var(--border); background: var(--bg); cursor: pointer; }
.dlg-foot .primary { width: auto; margin: 0; border: none; }
.danger-ghost { color: var(--danger); margin-right: auto; }
.row { display: flex; gap: 8px; margin: 10px 0; }
.row button { flex: 1; padding: 9px; border: 1px solid var(--border); border-radius: 9px; background: var(--bg); cursor: pointer; }
.signed { font-size: 14px; }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .app { grid-template-columns: 1fr; grid-template-areas: "top" "main"; }
  #menuBtn { display: block; }
  .drawer {
    position: fixed; top: 0; left: 0; bottom: 0; width: 280px; z-index: 16;
    transform: translateX(-100%); transition: transform .18s ease;
  }
  .drawer.open { transform: none; }
  .main { padding: 14px 16px 90px; }
}