.notebook-page {
  --nb-accent:#91caff;
  --nb-hero:#192747;
  --nb-good:#77d7b7;
  --nb-missed:#f1a4ac;
  display:grid;
  gap:14px;
  font-size:14px;
  line-height:1.45;
  color:var(--ink);
}
:root[data-theme="light"] .notebook-page {
  --nb-accent:#195492;
  --nb-hero:#e9edfa;
  --nb-good:#176b53;
  --nb-missed:#a33347;
}
.nb-hero,.nb-panel {
  min-width:0;
  border:1px solid var(--line);
  border-radius:14px;
  padding:16px;
  background:var(--s1);
}
.nb-hero { background:linear-gradient(115deg,var(--nb-hero),var(--s1)); }
.nb-intro { display:flex; align-items:center; gap:12px; margin-bottom:14px; }
:root .nb-intro h2 { margin:0; font-size:clamp(24px,2.3vw,34px); line-height:1.15; }
.nb-intro p { margin:5px 0 0; color:var(--mute); }
.nb-icon,.notebook-page .subject-symbol {
  flex:none;
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  border-radius:9px;
  color:var(--nb-accent);
  background:color-mix(in srgb,var(--nb-accent) 12%,var(--s1));
}
.nb-icon { width:44px; height:44px; }
.notebook-page .ico,.notebook-page .subject-symbol svg { width:17px; height:17px; flex:none; }
.nb-icon .ico { width:23px; height:23px; }
.nb-stats { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); border:1px solid var(--line); border-radius:10px; background:var(--s1); padding:8px 0; }
.nb-stats > div { display:flex; align-items:center; gap:8px; justify-content:center; padding:4px 8px; border-inline-start:1px solid var(--line); }
.nb-stats > div:first-child { border:0; }
.nb-stats .ico { color:var(--nb-accent); }
.nb-stats b { display:block; font-size:17px; font-variant-numeric:tabular-nums; }
.notebook-page small { display:block; color:var(--mute); font-size:12px; }
.nb-subjects { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:8px; }
:root .notebook-page button { min-height:42px; padding:7px 10px; font-size:13px; }
:root .nb-subjects button {
  display:flex;
  align-items:center;
  min-width:0;
  gap:8px;
  min-height:58px;
  text-align:left;
  color:var(--ink);
  border:1px solid var(--line);
  background:var(--s1);
}
:root .nb-subjects button[aria-pressed="true"] {
  background:color-mix(in srgb,var(--nb-accent) 12%,var(--s1));
  border-color:var(--nb-accent);
}
.nb-heading { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:8px; margin-bottom:10px; }
:root .nb-heading h3 { margin:0; font-size:17px; }
.nb-actions,.nb-review { display:flex; flex-wrap:wrap; gap:6px; }
:root .nb-actions button { display:inline-flex; align-items:center; gap:6px; color:var(--ink); }
.nb-insight { display:grid; grid-template-columns:minmax(100px,1fr) minmax(0,2fr); gap:8px; padding:9px 12px; background:var(--s2); border-radius:9px; }
.nb-insight b { display:block; font-size:14px; }
.nb-filters { display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:12px 0; }
:root .nb-review button[aria-pressed="true"],:root .notebook-page button.pri {
  color:#fff;
  background:#155bb4;
  border-color:#155bb4;
  box-shadow:none;
}
:root .nb-filters input,:root .nb-filters select {
  min-width:0;
  width:auto;
  min-height:42px;
  margin:0;
  color:var(--ink);
  background:var(--s2);
  border:1px solid var(--line);
  font:inherit;
  font-size:13px;
}
:root .nb-filters input { flex:1 1 155px; }
.nb-entries { display:grid; gap:8px; }
.nb-entry { padding:12px; border:1px solid var(--line); border-radius:10px; background:var(--s1); }
.nb-entry-head { display:grid; grid-template-columns:auto minmax(0,1fr) auto; align-items:start; gap:8px; }
:root .nb-entry h4 { margin:3px 0 0; color:var(--ink); font-size:15px; line-height:1.4; }
.nb-tag { display:inline-flex; align-items:center; gap:3px; padding:4px 7px; border-radius:8px; background:var(--s2); color:var(--mute); font-size:11px; white-space:nowrap; }
.nb-tag.nb-done { color:var(--nb-good); }
.nb-answers { margin:10px 0; }
.nb-answers p { display:flex; align-items:baseline; gap:6px; margin:3px 0; }
.nb-answers b { margin-inline-end:4px; }
.nb-answers .ico { align-self:flex-start; margin-top:2px; color:var(--nb-missed); }
.nb-answers p + p .ico { color:var(--nb-good); }
.nb-entry details { border-top:1px solid var(--line); padding-top:8px; color:var(--mute); }
.nb-entry summary { cursor:pointer; color:var(--nb-accent); }
.nb-entry details p { margin:6px 0 0; white-space:pre-wrap; }
.nb-entry-actions { margin-top:8px; justify-content:flex-end; }
.nb-status,.nb-empty { margin:8px 0; color:var(--mute); }
.nb-status:empty { margin:0; }
.notebook-page :focus-visible { outline:2px solid var(--nb-accent); outline-offset:2px; }
@media(max-width:690px) {
  .nb-subjects,.nb-stats { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .nb-stats > div { justify-content:flex-start; padding-inline:10px; }
  .nb-stats > div:nth-child(odd) { border-inline-start:0; }
}
@media(max-width:460px) {
  .nb-hero,.nb-panel { padding:12px; }
  .nb-entry-head { grid-template-columns:auto minmax(0,1fr); }
  .nb-tag { grid-column:2; justify-self:start; }
  .nb-entry-actions { justify-content:flex-start; }
}