body.edu-subject-page {
  --subject-bg: #0b1220;
  --subject-surface: #142035;
  --subject-surface-raised: #182844;
  --subject-border: rgba(143, 175, 212, 0.16);
  --subject-text: #e8f0fe;
  --subject-muted: #8eafd4;
  --subject-accent: #22c55e;
  background: var(--subject-bg);
  color: var(--subject-text);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

body.edu-subject-page::before {
  background: radial-gradient(ellipse 70% 36rem at 50% 0, rgba(34, 197, 94, 0.12), transparent 72%);
  content: "";
  inset: 0 0 auto;
  height: 38rem;
  pointer-events: none;
  position: absolute;
  z-index: 0;
}

.edu-subject-page nav {
  backdrop-filter: blur(20px);
  background: rgba(11, 18, 32, 0.86);
  border-bottom: 1px solid var(--subject-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.edu-subject-page .subject-simple-nav {
  align-items: center;
  display: flex;
  justify-content: space-between;
  min-height: 4.25rem;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

.edu-subject-page .subject-simple-brand {
  color: var(--subject-text);
  font-size: 1.2rem;
  font-weight: 800;
  text-decoration: none;
}

.edu-subject-page .subject-simple-brand span {
  background: var(--subject-accent);
  border-radius: 0.35rem;
  color: var(--subject-bg);
  margin-left: 0.2rem;
  padding: 0.1rem 0.4rem;
}

.edu-subject-page .subject-simple-links {
  display: flex;
  gap: 1rem;
}

.edu-subject-page .subject-simple-links a {
  color: var(--subject-muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.edu-subject-page .subject-simple-links a:hover {
  color: var(--subject-accent);
}

.edu-subject-page .page-hero.subject-page-hero {
  animation: none;
  background: transparent;
  isolation: isolate;
  margin: 0 auto;
  max-width: 1440px;
  padding: clamp(3rem, 8vw, 6.5rem) clamp(1rem, 5vw, 4rem) 2.5rem;
  position: relative;
}

.edu-subject-page .subject-page-hero::before {
  display: none;
}

.edu-subject-page .subject-page-hero .page-hero-inner {
  align-items: end;
  display: flex;
  gap: 2rem;
  justify-content: space-between;
  margin: 0;
  max-width: none;
}

.edu-subject-page .subject-page-hero .page-hero-text {
  animation: none;
  max-width: 800px;
}

.edu-subject-page .subject-page-hero h1 {
  color: var(--subject-text);
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1.08;
  margin: 0 0 1rem;
}

.edu-subject-page .subject-page-hero .page-icon {
  align-items: center;
  border: 1px solid var(--subject-border);
  border-radius: 1rem;
  display: inline-flex;
  height: 3.5rem;
  justify-content: center;
  margin-right: 0.65rem;
  vertical-align: middle;
  width: 3.5rem;
}

.edu-subject-page .subject-page-hero p {
  color: var(--subject-muted);
  line-height: 1.75;
  margin: 0;
  max-width: 650px;
}

.edu-subject-page .subject-hero-stat {
  background: rgba(20, 32, 53, 0.8);
  border: 1px solid var(--subject-border);
  border-radius: 1rem;
  display: grid;
  flex: 0 0 auto;
  gap: 0.35rem;
  min-width: 12rem;
  padding: 1.25rem 1.5rem;
}

.edu-subject-page .subject-hero-stat strong {
  color: var(--subject-accent);
  font-size: 2rem;
  line-height: 1;
}

.edu-subject-page .subject-hero-stat span {
  color: var(--subject-muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.edu-subject-page .subject-resource-center {
  margin: 0 auto;
  max-width: 1440px;
  padding: 1.5rem clamp(1rem, 5vw, 4rem) 6rem;
  position: relative;
  z-index: 1;
}

.edu-subject-page .subject-resource-heading {
  align-items: end;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.edu-subject-page .subject-resource-eyebrow {
  color: var(--subject-accent);
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin-bottom: 0.65rem;
  text-transform: uppercase;
}

.edu-subject-page .subject-resource-heading h2 {
  color: var(--subject-text);
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 0.45rem;
}

.edu-subject-page .subject-resource-heading p {
  color: var(--subject-muted);
  line-height: 1.6;
  margin: 0;
}

.edu-subject-page .subject-resource-count {
  border: 1px solid var(--subject-border);
  border-radius: 999px;
  color: var(--subject-muted);
  flex: 0 0 auto;
  font-size: 0.85rem;
  padding: 0.55rem 0.9rem;
}

.edu-subject-page .subject-resource-controls {
  align-items: center;
  background: rgba(20, 32, 53, 0.65);
  border: 1px solid var(--subject-border);
  border-radius: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding: 0.8rem;
}

.edu-subject-page .subject-search {
  flex: 1 1 18rem;
}

.edu-subject-page .subject-search input {
  background: rgba(11, 18, 32, 0.8);
  border: 1px solid var(--subject-border);
  border-radius: 0.7rem;
  color: var(--subject-text);
  font: inherit;
  min-height: 2.8rem;
  outline: none;
  padding: 0.7rem 0.9rem;
  width: 100%;
}

.edu-subject-page .subject-search input:focus {
  border-color: var(--subject-accent);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}

.edu-subject-page .subject-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.edu-subject-page .subject-filter {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0.65rem;
  color: var(--subject-muted);
  cursor: pointer;
  font: inherit;
  font-size: 0.85rem;
  padding: 0.65rem 0.8rem;
}

.edu-subject-page .subject-filter:hover,
.edu-subject-page .subject-filter.is-active {
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.24);
  color: var(--subject-accent);
}

.edu-subject-page .subject-resource-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
}

.edu-subject-page .subject-file-card {
  background: linear-gradient(145deg, rgba(24, 40, 68, 0.96), rgba(18, 30, 51, 0.96));
  border: 1px solid var(--subject-border);
  border-radius: 1rem;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  transition: border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

.edu-subject-page .subject-file-card:hover {
  border-color: rgba(34, 197, 94, 0.45);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.24);
  transform: translateY(-3px);
}

.edu-subject-page .subject-file-card[hidden] {
  display: none;
}

.edu-subject-page .subject-file-preview {
  background: #0a101c;
  height: 10rem;
  object-fit: contain;
  padding: 0.5rem;
  width: 100%;
}

.edu-subject-page .subject-file-icon {
  align-items: center;
  background: rgba(34, 197, 94, 0.1);
  border-bottom: 1px solid var(--subject-border);
  color: var(--subject-accent);
  display: flex;
  font-size: 0.85rem;
  font-weight: 800;
  height: 6.25rem;
  justify-content: center;
  letter-spacing: 0.08em;
}

.edu-subject-page .subject-file-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 1rem;
}

.edu-subject-page .subject-file-body h3 {
  color: var(--subject-text);
  font-size: 0.95rem;
  line-height: 1.45;
  margin: 0 0 0.4rem;
  overflow-wrap: anywhere;
}

.edu-subject-page .subject-file-body > p {
  color: var(--subject-muted);
  font-size: 0.78rem;
  margin: 0 0 1rem;
}

.edu-subject-page .subject-file-actions {
  display: flex;
  gap: 0.6rem;
  margin-top: auto;
}

.edu-subject-page .subject-file-actions a {
  border: 1px solid rgba(34, 197, 94, 0.28);
  border-radius: 0.65rem;
  color: var(--subject-accent);
  flex: 1;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.65rem 0.45rem;
  text-align: center;
  text-decoration: none;
}

.edu-subject-page .subject-file-actions a:hover {
  background: var(--subject-accent);
  color: #07120b;
}

.edu-subject-page .subject-resource-state {
  color: var(--subject-muted);
  margin: 2rem 0;
  padding: 2rem 1rem;
  text-align: center;
}

.edu-subject-page [hidden] {
  display: none !important;
}

.edu-subject-page .sr-only {
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

@media (max-width: 720px) {
  .edu-subject-page .subject-simple-nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.75rem;
    padding-bottom: 0.8rem;
    padding-top: 0.8rem;
  }

  .edu-subject-page .subject-simple-links {
    gap: 0.8rem;
  }

  .edu-subject-page .subject-page-hero .page-hero-inner,
  .edu-subject-page .subject-resource-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .edu-subject-page .subject-hero-stat {
    min-width: 0;
  }

  .edu-subject-page .subject-filters {
    width: 100%;
  }

  .edu-subject-page .subject-filter {
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .edu-subject-page *,
  .edu-subject-page *::before,
  .edu-subject-page *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}