/* Notebook page. Reuses the homepage theme tokens (light + html[data-theme="dark"]). */
.nb {
  --nb-accent: var(--accent, #0f766e);
  --nb-accent-soft: var(--accent-soft, rgba(15, 118, 110, 0.1));
  --nb-surface: var(--surface, #fff);
  --nb-muted: var(--surface-muted, #f7faf9);
  --nb-border: var(--border-soft, rgba(24, 56, 52, 0.12));
  --nb-text: var(--global-text-color, #495057);
  --nb-text-light: var(--global-text-color-light, #9ba1a6);
  --nb-danger: #c2410c;
  --nb-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  padding: 0.75rem clamp(0.75rem, 1.2vw, 1.25rem) 1rem;
  color: var(--nb-text);
  font-size: 15px;
}
.nb *, .nb *::before, .nb *::after { box-sizing: inherit; }
.nb [hidden] { display: none !important; }

/* sign-in */
.nb-signin { display: grid; place-items: center; min-height: 60vh; }
.nb-signin__card {
  text-align: center; padding: 2.5rem 2rem; max-width: 420px; width: 100%;
  background: var(--nb-surface); border: 1px solid var(--nb-border); border-radius: 14px;
  box-shadow: var(--shadow-soft, 0 16px 45px rgba(24, 56, 52, 0.08));
}
.nb-signin__card h1 { margin: 0 0 0.5rem; font-size: 1.8rem; }
.nb-signin__card p { margin: 0 0 1.5rem; color: var(--nb-text-light); }
.nb-signin__error { color: var(--nb-danger) !important; margin: 1rem 0 0 !important; font-size: 0.9rem; }

/* controls */
.nb-btn {
  font: inherit; font-size: 0.85rem; font-weight: 600; line-height: 1;
  padding: 0.55rem 0.85rem; border-radius: 8px; cursor: pointer; white-space: nowrap;
  color: var(--nb-text); background: var(--nb-muted); border: 1px solid var(--nb-border);
  transition: background 120ms ease, border-color 120ms ease;
}
.nb-btn:hover:not(:disabled) { border-color: var(--nb-accent); }
.nb-btn:disabled { opacity: 0.45; cursor: default; }
.nb-btn--primary { background: var(--nb-accent); border-color: var(--nb-accent); color: #fff; }
html[data-theme="dark"] .nb-btn--primary { color: #0b2b28; }
.nb-btn--danger { color: var(--nb-danger); }
.nb-btn--icon { display: none; padding: 0.45rem 0.6rem; font-size: 1rem; }
.nb-link { font: inherit; font-size: 0.85rem; background: none; border: 0; padding: 0; color: var(--nb-accent); cursor: pointer; }
.nb-input {
  font: inherit; font-size: 0.9rem; padding: 0.5rem 0.65rem; min-width: 0;
  color: var(--nb-text); background: var(--nb-surface);
  border: 1px solid var(--nb-border); border-radius: 8px;
}
.nb-input:focus, .nb-editor:focus { outline: 2px solid var(--nb-accent-soft); border-color: var(--nb-accent); }

/* app grid */
.nb-app {
  display: grid; grid-template-columns: clamp(240px, 18vw, 340px) minmax(0, 1fr); gap: 0.75rem;
  height: calc(100dvh - 100px); min-height: 480px;
}
.nb-side, .nb-main {
  background: var(--nb-surface); border: 1px solid var(--nb-border); border-radius: 12px;
  min-height: 0; display: flex; flex-direction: column; overflow: hidden;
}
.nb-side__top { display: flex; flex-direction: column; gap: 0.5rem; padding: 0.75rem; border-bottom: 1px solid var(--nb-border); }
.nb-side__actions { display: flex; gap: 0.5rem; }
.nb-side__actions .nb-btn { flex: 1; }
.nb-side__foot {
  display: flex; justify-content: space-between; align-items: center; gap: 0.5rem;
  padding: 0.6rem 0.85rem; border-top: 1px solid var(--nb-border); font-size: 0.82rem; color: var(--nb-text-light);
}

.nb-tree { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 0.4rem 0.4rem 2rem; border-radius: 8px; transition: background 120ms ease; }
.nb-tree ul { list-style: none; margin: 0; padding: 0; }
.nb-tree li { margin: 0; }
.nb-tree button { font: inherit; border: 0; background: none; color: var(--nb-text); cursor: pointer; }
.nb-note, .nb-folder {
  --indent: calc(var(--depth, 0) * 0.95rem);
  display: flex; align-items: center; width: 100%; border-radius: 7px;
}
.nb-note {
  display: block; text-align: left; font-size: 0.9rem; cursor: pointer;
  user-select: none; -webkit-user-select: none;
  padding: 0.38rem 0.6rem 0.38rem calc(0.6rem + var(--indent) + 1rem);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.nb-note:hover, .nb-folder:hover { background: var(--nb-muted); }
.nb-note[aria-current="true"] { background: var(--nb-accent-soft); color: var(--nb-accent); font-weight: 650; }
.nb-note:focus-visible { outline: 2px solid var(--nb-accent); outline-offset: -2px; }
.nb-note.has-draft::after { content: " •"; color: #d97706; }
.nb-note.is-dragging { opacity: 0.4; }
.nb-note { -webkit-touch-callout: none; touch-action: pan-y; }
body.nb-dragging, body.nb-dragging * { cursor: grabbing !important; user-select: none !important; }
.nb-ghost {
  position: fixed; left: 0; top: 0; z-index: 1000; pointer-events: none; max-width: 240px;
  padding: 0.35rem 0.7rem; border-radius: 8px; font-size: 0.85rem; font-weight: 600;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: #fff; background: var(--accent, #0f766e); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}
.nb-folder__toggle {
  flex: 1; min-width: 0; display: flex; align-items: center; gap: 0.35rem; text-align: left;
  padding: 0.38rem 0.3rem 0.38rem calc(0.45rem + var(--indent));
  font-size: 0.88rem; font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.nb-caret { flex: none; width: 0.8rem; height: 0.8rem; display: inline-grid; place-items: center; transition: transform 120ms ease; }
.nb-caret::before { content: ""; border: 4px solid transparent; border-left: 5px solid var(--nb-text-light); margin-left: 3px; }
.nb-folder__toggle[aria-expanded="true"] .nb-caret { transform: rotate(90deg); }
.nb-folder__actions { flex: none; display: flex; margin-right: 0.15rem; opacity: 0; }
.nb-folder__add {
  width: 1.55rem; height: 1.55rem; border-radius: 6px; display: inline-grid; place-items: center; padding: 0;
  font-size: 1rem !important; line-height: 1; color: var(--nb-text-light) !important;
}
.nb-folder:hover .nb-folder__actions, .nb-folder__actions:focus-within { opacity: 1; }
.nb-folder__add:hover { background: var(--nb-accent-soft) !important; color: var(--nb-accent) !important; }
@media (hover: none) { .nb-folder__actions { opacity: 1; } }
.nb-tree.is-dragging { outline: 1px dashed var(--nb-border); outline-offset: -2px; }
.nb-tree.is-drop { background: var(--nb-accent-soft); }
.nb-rootzone {
  position: sticky; bottom: 0; margin-top: 0.5rem; padding: 0.6rem; border-radius: 8px; text-align: center;
  font-size: 0.8rem; color: var(--nb-text-light); background: var(--nb-surface); border: 1.5px dashed var(--nb-border);
}
.nb-rootzone.is-drop { color: var(--nb-accent); border-color: var(--nb-accent); background: var(--nb-accent-soft); }
.nb-folder.is-drop { background: var(--nb-accent-soft); box-shadow: inset 0 0 0 1.5px var(--nb-accent); }
.nb-tree__empty { padding: 1rem 0.6rem; color: var(--nb-text-light); font-size: 0.88rem; margin: 0; }

/* main */
.nb-bar {
  display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
  padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--nb-border);
}
.nb-path { flex: 1 1 200px; font-family: var(--nb-mono); font-size: 0.85rem; border-color: transparent; background: transparent; }
.nb-path:hover:not(:disabled) { border-color: var(--nb-border); }
.nb-status { font-size: 0.8rem; color: var(--nb-text-light); min-width: 4.5rem; text-align: right; }
.nb-status[data-kind="dirty"] { color: #d97706; }
.nb-status[data-kind="error"] { color: var(--nb-danger); }
.nb-status[data-kind="ok"] { color: var(--nb-accent); }
.nb-views { display: inline-flex; border: 1px solid var(--nb-border); border-radius: 8px; overflow: hidden; }
.nb-views button {
  font: inherit; font-size: 0.8rem; padding: 0.45rem 0.65rem; border: 0; cursor: pointer;
  background: transparent; color: var(--nb-text-light);
}
.nb-views button + button { border-left: 1px solid var(--nb-border); }
.nb-views button[aria-pressed="true"] { background: var(--nb-accent-soft); color: var(--nb-accent); font-weight: 650; }

.nb-conflict {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; padding: 0.6rem 0.75rem;
  background: rgba(217, 119, 6, 0.1); border-bottom: 1px solid rgba(217, 119, 6, 0.35); font-size: 0.88rem;
}
.nb-conflict span { flex: 1 1 220px; }

.nb-panes { flex: 1; min-height: 0; display: grid; grid-template-columns: 1fr 1fr; }
.nb-panes[data-view="edit"] { grid-template-columns: 1fr; }
.nb-panes[data-view="edit"] .nb-preview { display: none; }
.nb-panes[data-view="preview"] { grid-template-columns: 1fr; }
.nb-panes[data-view="preview"] .nb-editor { display: none; }
.nb-editor {
  resize: none; width: 100%; height: 100%; margin: 0; border: 0; border-radius: 0;
  padding: 1.1rem 1.25rem; font-family: var(--nb-mono); font-size: 0.9rem; line-height: 1.65;
  color: var(--nb-text); background: var(--nb-surface); tab-size: 2;
}
.nb-panes[data-view="split"] .nb-editor { border-right: 1px solid var(--nb-border); }
.nb-preview { overflow-y: auto; padding: 1.1rem 1.5rem 3rem; line-height: 1.7; font-size: 0.97rem; overflow-wrap: anywhere; }
.nb-preview > :first-child { margin-top: 0; }
.nb-preview h1, .nb-preview h2, .nb-preview h3 { line-height: 1.3; margin: 1.4em 0 0.5em; }
.nb-preview h1 { font-size: 1.6rem; } .nb-preview h2 { font-size: 1.3rem; } .nb-preview h3 { font-size: 1.1rem; }
.nb-preview pre { background: var(--nb-muted); padding: 0.8rem 1rem; border-radius: 8px; overflow-x: auto; font-size: 0.85rem; }
.nb-preview code { font-family: var(--nb-mono); font-size: 0.88em; }
.nb-preview blockquote { margin: 1em 0; padding: 0.2em 1em; border-left: 3px solid var(--nb-accent); color: var(--nb-text-light); }
.nb-preview table { border-collapse: collapse; display: block; overflow-x: auto; }
.nb-preview th, .nb-preview td { border: 1px solid var(--nb-border); padding: 0.35rem 0.6rem; }
.nb-preview img { max-width: 100%; }
.nb-preview input[type="checkbox"] { margin-right: 0.4em; }

/* phones */
@media (max-width: 760px) {
  .nb { padding: 0.5rem 0.75rem 1.5rem; }
  .nb-app { grid-template-columns: minmax(0, 1fr); height: calc(100dvh - 90px); }
  .nb-side { display: none; }
  .nb--side-open .nb-side { display: flex; }
  .nb--side-open .nb-main { display: none; }
  .nb-btn--icon { display: inline-block; }
  .nb-panes[data-view="split"] { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .nb-panes[data-view="split"] .nb-editor { border-right: 0; border-bottom: 1px solid var(--nb-border); }
  .nb-path { order: 5; flex-basis: 100%; }
  .nb-status { min-width: 0; }
  .nb-views { margin-left: auto; }
  .nb-bar { gap: 0.4rem; padding: 0.5rem; }
  .nb-bar .nb-btn, .nb-views button { padding: 0.45rem 0.55rem; font-size: 0.78rem; }
}