/* School on Analytical Connectionism 2026.
   The three background sheets are first-page vector exports of Lucia's
   handwritten notebooks. They are decorative; the readable titles and links
   stay in the document flow below. */

body.ac-school-page {
  --ac-ink: #241711;
  --ac-copy: #5e4438;
  --ac-paper: #fbf6df;
  --ac-paper-glass: rgba(251, 246, 223, 0.88);
  --ac-rule: rgba(79, 36, 31, 0.42);
  --ac-red: #8a2638;
  --ac-blue: #1f5b6d;
  --ac-green: #2e6b52;
  isolation: isolate;
  overflow-x: hidden;
  position: relative;
}

.ac-school-page .header,
.ac-school-page .main,
.ac-school-page .footer,
.ac-school-page .top-link {
  position: relative;
  z-index: 2;
}

.ac-school-page .main {
  max-width: calc(1120px + var(--gap) * 2);
}

.ac-school-page .post-single {
  backdrop-filter: blur(3px);
  background: var(--ac-paper-glass);
  border-color: var(--site-border-strong);
  box-shadow: 10px 10px 0 rgba(79, 36, 31, 0.2);
  overflow: hidden;
  padding: clamp(1.2rem, 3vw, 2.4rem);
  position: relative;
}

.ac-school-page .post-single::after {
  background:
    linear-gradient(rgba(31, 91, 109, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 91, 109, 0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  content: "";
  inset: 0;
  mask-image: linear-gradient(to bottom, black, transparent 34%);
  opacity: 0.42;
  pointer-events: none;
  position: absolute;
  z-index: -1;
}

/* The SVGs retain their white PDF paper. Multiply blending makes the paper
   disappear into the site background while leaving the handwriting visible. */
.ac-notes-background {
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  position: absolute;
  user-select: none;
  z-index: 0;
}

.ac-background-sheet {
  background-position: top center;
  background-repeat: no-repeat;
  background-size: contain;
  filter: sepia(0.18) saturate(0.72) contrast(1.06);
  mix-blend-mode: multiply;
  opacity: 0.17;
  position: absolute;
  will-change: transform;
}

.ac-background-sheet.is-smolensky {
  animation: ac-drift-left 32s ease-in-out infinite alternate;
  background-image: url("/posts/post11/img/smolensky-notes.svg");
  height: 850px;
  left: -9rem;
  top: 4rem;
  transform: rotate(-6deg);
  width: 500px;
}

.ac-background-sheet.is-rowland {
  animation: ac-drift-right 36s ease-in-out infinite alternate;
  background-image: url("/posts/post11/img/rowland-notes.svg");
  height: 700px;
  right: -7rem;
  top: 29rem;
  transform: rotate(6deg);
  width: 500px;
}

.ac-background-sheet.is-biehl {
  animation: ac-drift-low 40s ease-in-out infinite alternate;
  background-image: url("/posts/post11/img/biehl-notes.svg");
  bottom: -8rem;
  height: 700px;
  left: 20%;
  transform: rotate(-3deg);
  width: 520px;
}

@keyframes ac-drift-left {
  to {
    transform: translate3d(12px, 16px, 0) rotate(-5deg);
  }
}

@keyframes ac-drift-right {
  to {
    transform: translate3d(-10px, 18px, 0) rotate(5deg);
  }
}

@keyframes ac-drift-low {
  to {
    transform: translate3d(8px, -14px, 0) rotate(-2deg);
  }
}

.ac-hero {
  border-bottom: 1px solid var(--ac-rule);
  margin-bottom: clamp(1.7rem, 4vw, 3rem);
  padding: clamp(0.4rem, 2vw, 1.2rem) 0 clamp(1.7rem, 4vw, 3rem);
  position: relative;
}

.ac-hero::before {
  color: rgba(138, 38, 56, 0.74);
  content: "∿";
  font-size: clamp(4.5rem, 12vw, 8.5rem);
  font-weight: 400;
  line-height: 0.7;
  position: absolute;
  right: clamp(-0.35rem, 1vw, 1rem);
  top: 0;
  transform: rotate(-8deg);
}

.ac-kicker {
  color: var(--ac-green);
  font-size: 0.79rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin: 0 0 0.85rem;
  text-transform: uppercase;
}

.ac-school-page .ac-title {
  color: var(--ac-ink);
  font-size: clamp(2.15rem, 7vw, 5.15rem);
  letter-spacing: -0.055em;
  line-height: 0.98;
  margin: 0;
  max-width: 13ch;
  position: relative;
  text-wrap: balance;
  z-index: 1;
}

.ac-title-mark {
  display: inline;
  position: relative;
  white-space: nowrap;
}

.ac-title-mark::after {
  background: rgba(220, 202, 91, 0.48);
  bottom: 0.05em;
  content: "";
  height: 0.25em;
  left: -0.03em;
  position: absolute;
  right: -0.04em;
  transform: rotate(-1deg);
  z-index: -1;
}

.ac-lede {
  color: var(--ac-copy);
  font-size: clamp(1rem, 2vw, 1.18rem);
  line-height: 1.75;
  margin: 1.5rem 0 0;
  max-width: 68ch;
}

.ac-hero-meta {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  margin-top: 1.45rem;
}

.ac-live-label {
  align-items: center;
  color: var(--ac-red);
  display: inline-flex;
  font-size: 0.8rem;
  font-weight: 700;
  gap: 0.48rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ac-live-label::before {
  background: var(--ac-red);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(138, 38, 56, 0.12);
  content: "";
  height: 0.52rem;
  width: 0.52rem;
}

.ac-school-page .ac-official-link {
  color: var(--ac-blue);
  font-size: 0.88rem;
  font-weight: 700;
  text-underline-offset: 0.25em;
}

.ac-section-head {
  align-items: end;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: 0 0 1.2rem;
}

.ac-school-page .post-content .ac-section-title {
  color: var(--ac-ink);
  font-size: clamp(1.55rem, 3vw, 2.3rem);
  letter-spacing: -0.035em;
  line-height: 1.12;
  margin: 0;
}

.ac-section-note {
  color: var(--site-text-soft);
  flex: 0 0 auto;
  font-size: 0.77rem;
  letter-spacing: 0.06em;
  margin: 0;
  text-transform: uppercase;
}

.ac-notebook-grid {
  display: grid;
  gap: clamp(1rem, 2.2vw, 1.5rem);
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.25rem;
}

.ac-notebook-card {
  --card-accent: var(--ac-blue);
  background: rgba(251, 246, 223, 0.84);
  border: 1px solid var(--site-border-strong);
  box-shadow: 6px 6px 0 rgba(79, 36, 31, 0.18);
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  position: relative;
  transition:
    box-shadow 180ms ease,
    transform 180ms ease;
}

.ac-notebook-card:nth-child(2) {
  --card-accent: var(--ac-green);
}

.ac-notebook-card:nth-child(3) {
  --card-accent: var(--ac-red);
}

.ac-notebook-card:hover {
  box-shadow: 3px 3px 0 rgba(79, 36, 31, 0.2);
  transform: translate(2px, 2px) rotate(-0.2deg);
}

.ac-preview-link {
  background:
    linear-gradient(rgba(31, 91, 109, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 91, 109, 0.06) 1px, transparent 1px),
    #fff;
  background-size: 24px 24px;
  border-bottom: 3px solid var(--card-accent);
  display: block;
  height: clamp(210px, 22vw, 275px);
  overflow: hidden;
  position: relative;
}

.ac-preview-link::after {
  background: linear-gradient(to bottom, transparent 65%, rgba(36, 23, 17, 0.1));
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
}

.ac-school-page .post-content .ac-preview-link:hover {
  background-color: #fff;
}

.ac-school-page .post-content .ac-preview-image {
  background: #fff;
  border: 0;
  border-radius: 0;
  filter: none;
  height: auto;
  margin: 0;
  min-height: 100%;
  object-fit: cover;
  object-position: center top;
  transform: scale(1.015);
  transform-origin: center top;
  transition: transform 220ms ease;
  width: 100%;
}

.ac-notebook-card:hover .ac-preview-image {
  transform: scale(1.045);
}

.ac-card-copy {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 1rem 1rem 1.1rem;
  position: relative;
}

.ac-card-number {
  color: rgba(79, 36, 31, 0.2);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
  position: absolute;
  right: 0.85rem;
  top: 0.85rem;
}

.ac-speaker {
  color: var(--card-accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  margin: 0 2.4rem 0.55rem 0;
  text-transform: uppercase;
}

.ac-school-page .post-content .ac-card-title {
  color: var(--ac-ink);
  font-size: clamp(1.02rem, 1.7vw, 1.24rem);
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin: 0;
  text-wrap: balance;
}

.ac-card-description {
  color: var(--ac-copy);
  font-size: 0.88rem;
  line-height: 1.65;
  margin: 0.8rem 0 1rem;
}

.ac-card-actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.9rem;
  margin-top: auto;
}

.ac-school-page .post-content .ac-open-notes,
.ac-school-page .post-content .ac-download-notes {
  font-size: 0.82rem;
  font-weight: 700;
  text-underline-offset: 0.25em;
}

.ac-school-page .post-content .ac-open-notes {
  color: var(--card-accent);
}

.ac-school-page .post-content .ac-download-notes {
  color: var(--site-text-muted);
}

.ac-living-note {
  align-items: start;
  background:
    linear-gradient(transparent 31px, rgba(31, 91, 109, 0.12) 32px),
    rgba(251, 246, 223, 0.76);
  background-size: 100% 32px;
  border: 1px solid var(--site-border-strong);
  display: grid;
  gap: 0.5rem 1.4rem;
  grid-template-columns: auto minmax(0, 1fr);
  margin-top: clamp(1.6rem, 4vw, 2.8rem);
  padding: 1rem 1.15rem;
  transform: rotate(-0.35deg);
}

.ac-living-note strong {
  color: var(--ac-red);
  font-size: 0.78rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.ac-school-page .post-content .ac-living-note p {
  color: var(--ac-copy);
  font-size: 0.91rem;
  line-height: 1.7;
  margin: 0;
}

@media screen and (max-width: 900px) {
  .ac-notebook-grid {
    grid-template-columns: 1fr;
  }

  .ac-preview-link {
    height: clamp(220px, 58vw, 430px);
  }

  .ac-school-page .post-content .ac-preview-image {
    object-fit: cover;
  }

  .ac-background-sheet {
    opacity: 0.1;
  }

  .ac-background-sheet.is-rowland {
    right: -15rem;
  }
}

@media screen and (max-width: 620px) {
  .ac-school-page .post-single {
    backdrop-filter: none;
    background: rgba(251, 246, 223, 0.94);
    box-shadow: 6px 6px 0 rgba(79, 36, 31, 0.18);
  }

  .ac-hero::before {
    opacity: 0.4;
  }

  .ac-title-mark {
    white-space: normal;
  }

  .ac-section-head {
    align-items: start;
    flex-direction: column;
    gap: 0.45rem;
  }

  .ac-background-sheet.is-rowland,
  .ac-background-sheet.is-biehl {
    background-image: none;
    display: none;
  }

  .ac-background-sheet.is-smolensky {
    left: -17rem;
    opacity: 0.07;
    top: 11rem;
  }

  .ac-living-note {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ac-background-sheet,
  .ac-notebook-card,
  .ac-preview-image {
    animation: none !important;
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .ac-notes-background,
  .ac-hero::before,
  .ac-title-mark::after {
    display: none;
  }
}

@media print {
  .ac-notes-background,
  .ac-card-actions,
  .ac-live-label::before {
    display: none;
  }

  .ac-school-page .post-single,
  .ac-notebook-card,
  .ac-living-note {
    background: #fff;
    box-shadow: none;
  }

  .ac-notebook-card {
    break-inside: avoid;
  }
}