body {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
}

.notes-page {
  flex: 1;
}

.notes-intro {
  padding: clamp(26px, 4.5vw, 44px) 0 clamp(22px, 3.2vw, 32px);
  border-bottom: 1px solid var(--line-strong);
}

.notes-intro .container,
.notes-library .container {
  width: min(calc(100% - (2 * var(--gutter))), 1120px);
}

.notes-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(250px, 0.65fr);
  gap: clamp(36px, 6vw, 86px);
  align-items: start;
}

.notes-intro .page-kicker {
  margin-bottom: 8px;
}

.notes-intro h1 {
  margin: 0;
  color: var(--ink);
  font-family: Bahnschrift, "Segoe UI Variable Display", "Segoe UI", "Microsoft YaHei UI", sans-serif;
  font-size: clamp(2.25rem, 4vw, 3.05rem);
  font-weight: 630;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.notes-lead {
  margin: 12px 0 0;
  color: var(--ink);
  font-size: clamp(15px, 1.35vw, 17px);
  font-weight: 570;
  line-height: 1.6;
}

.notes-description {
  max-width: 56em;
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 13.3px;
  line-height: 1.82;
}

.notes-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 18px;
}

.notes-primary,
.notes-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 5px 11px;
  border: 1px solid var(--accent);
  color: #fff;
  background: var(--accent);
  font-size: 11.5px;
  line-height: 1.4;
  text-decoration: none;
}

.notes-secondary {
  color: var(--accent-strong);
  background: transparent;
}

.notes-primary:hover {
  border-color: var(--accent-strong);
  color: #fff;
  background: var(--accent-strong);
}

.notes-secondary:hover {
  border-color: var(--accent-strong);
  color: var(--accent-strong);
  background: var(--accent-wash);
}

.notes-about {
  padding: 2px 0 0 24px;
  border-left: 1px solid var(--line-strong);
}

.notes-about-title {
  margin: 0 0 8px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1.5;
  letter-spacing: 0.05em;
}

.notes-about dl {
  display: grid;
  gap: 8px;
  margin: 0;
}

.notes-about dl div {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding-top: 7px;
  border-top: 1px solid var(--line);
}

.notes-about dl div:first-child {
  padding-top: 0;
  border-top: 0;
}

.notes-about dt {
  color: var(--muted-light);
  font-size: 10px;
  line-height: 1.55;
}

.notes-about dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11.5px;
  line-height: 1.6;
}

.notes-library {
  padding: clamp(22px, 3.2vw, 32px) 0 clamp(22px, 3.6vw, 34px);
}

.notes-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 8px 36px;
}

.notes-kicker {
  margin: 0 0 4px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.notes-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1.3rem, 1.9vw, 1.55rem);
  font-weight: 650;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.notes-heading > p {
  margin: 0;
  color: var(--muted);
  font-size: 11.8px;
  line-height: 1.65;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 12px;
}

.note-book {
  display: flex;
  flex-direction: column;
  min-height: 145px;
  padding: 14px 16px 13px;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  background: rgba(251, 252, 249, 0.68);
  text-decoration: none;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.note-book:hover {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--accent-wash);
}

.book-meta {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 9.2px;
  line-height: 1.5;
}

.note-book h3 {
  margin: 4px 0 5px;
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 660;
  line-height: 1.3;
}

.note-book p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12.5px;
  line-height: 1.65;
}

.book-action {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  margin-top: auto;
  padding-top: 8px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1.5;
}

.notes-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  margin-top: 14px;
  padding-top: 11px;
  border-top: 1px solid var(--line);
}

.notes-foot p {
  max-width: 72em;
  margin: 0;
  color: var(--muted);
  font-size: 10.6px;
  line-height: 1.65;
}

.notes-foot a {
  flex: 0 0 auto;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 9.5px;
  line-height: 1.5;
  text-decoration: none;
}

.notes-foot a:hover {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

@media (max-width: 880px) {
  .notes-intro-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .notes-about {
    padding: 14px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .notes-about dl {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 22px;
  }

  .notes-about dl div:nth-child(2) {
    border-top: 0;
    padding-top: 0;
  }
}

@media (min-width: 881px) and (max-height: 740px) {
  .notes-intro {
    padding-top: 28px;
    padding-bottom: 22px;
  }

  .notes-library {
    padding-top: 22px;
    padding-bottom: 22px;
  }

  .note-book {
    min-height: 130px;
  }
}

@media (max-width: 620px) {
  .notes-intro {
    padding-top: 22px;
  }

  .notes-intro h1 {
    font-size: 2.05rem;
  }

  .notes-description {
    font-size: 12.8px;
  }

  .notes-about dl {
    grid-template-columns: 1fr;
  }

  .notes-about dl div:nth-child(2) {
    border-top: 1px solid var(--line);
    padding-top: 7px;
  }

  .book-grid {
    grid-template-columns: 1fr;
  }

  .note-book {
    min-height: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .note-book {
    transition: none;
  }
}

@media print {
  .note-book {
    background: #fff;
  }
}