:root {
  color-scheme: dark;
  --bg: #07090f;
  --panel: rgba(17, 21, 31, 0.92);
  --ink: #f7f8fb;
  --soft: #d8deec;
  --muted: #a9b0c3;
  --line: rgba(255, 255, 255, 0.14);
  --blue: #2f7df6;
  --cyan: #31d7d3;
  --pink: #ff4fa3;
  --purple: #9d6cff;
  --gold: #f6be4f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 12%, rgba(47, 125, 246, 0.18), transparent 28rem),
    radial-gradient(circle at 88% 18%, rgba(157, 108, 255, 0.16), transparent 30rem),
    linear-gradient(180deg, #07090f 0%, #10131b 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  z-index: 20;
  transform: translateY(-150%);
  border-radius: 0.45rem;
  background: var(--cyan);
  color: #021114;
  padding: 0.6rem 0.8rem;
  font-weight: 900;
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell {
  width: min(1180px, calc(100% - 1.25rem));
  margin: 0 auto;
  padding: 1.25rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
  font-weight: 950;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 0.5rem;
  background: linear-gradient(135deg, rgba(47, 125, 246, 0.26), rgba(49, 215, 211, 0.15));
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  justify-content: flex-end;
}

.top-nav a {
  min-height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: rgba(255, 255, 255, 0.07);
  color: var(--ink);
  padding: 0 0.9rem;
  font-weight: 850;
  text-decoration: none;
}

.top-nav a:hover {
  border-color: var(--cyan);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(17rem, 0.65fr);
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 1rem;
}

.hero-copy,
.hero-panel,
.panel,
.resource-card,
.learning-section {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  box-shadow: 0 1rem 2.5rem rgba(0, 0, 0, 0.18);
}

.hero-copy {
  padding: clamp(1.25rem, 4vw, 2.25rem);
}

.hero-panel,
.panel,
.resource-card,
.learning-section {
  padding: 1rem;
}

.hero-copy h1 {
  margin: 0.3rem 0 0.75rem;
  font-size: clamp(2.1rem, 7vw, 4.8rem);
  line-height: 0.96;
  max-width: 14ch;
}

.hero-copy p,
.hero-panel p,
.section-heading p,
.panel p,
.learning-section p,
li {
  color: var(--muted);
  line-height: 1.58;
}

.note {
  max-width: 58rem;
  border-left: 3px solid var(--gold);
  padding-left: 0.85rem;
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.library-search,
.library-map,
.learning-section {
  margin-top: 1rem;
}

.library-search {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr);
  gap: 1rem;
  align-items: end;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(17, 21, 31, 0.78);
  padding: 1rem;
}

.library-search h2 {
  margin: 0.25rem 0 0;
  font-size: clamp(1.35rem, 3vw, 2.2rem);
  line-height: 1.08;
}

.search-box {
  display: grid;
  gap: 0.4rem;
  color: var(--soft);
  font-weight: 850;
}

.search-box input {
  width: 100%;
  min-height: 3.1rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: rgba(255, 255, 255, 0.08);
  color: var(--ink);
  padding: 0 0.9rem;
  font: inherit;
}

.search-box input::placeholder {
  color: rgba(216, 222, 236, 0.58);
}

.search-status {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--cyan);
  font-weight: 850;
}

.learning-section {
  scroll-margin-top: 1rem;
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2,
.learning-section h2 {
  margin: 0.25rem 0 0.5rem;
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1.08;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.75rem;
}

.resource-grid.six {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.resource-card {
  min-height: 13rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: var(--ink);
  text-decoration: none;
}

.resource-card:hover {
  border-color: var(--blue);
  transform: translateY(-1px);
}

.resource-card span {
  width: fit-content;
  border-radius: 999px;
  border: 1px solid rgba(49, 215, 211, 0.35);
  color: var(--cyan);
  padding: 0.2rem 0.55rem;
  font-weight: 950;
  font-size: 0.78rem;
}

.resource-card h3,
.panel h3 {
  margin: 0.45rem 0 0.5rem;
}

.resource-card p {
  margin: 0;
}

.topic-grid,
.term-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.term-list {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.topic-card {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 1rem;
}

.topic-card[hidden] {
  display: none;
}

.topic-card h3 {
  margin: 0 0 0.55rem;
  color: var(--soft);
}

.topic-card p {
  margin: 0;
}

.topic-card p + p {
  margin-top: 0.65rem;
}

.ask {
  border-top: 1px solid var(--line);
  padding-top: 0.65rem;
  color: var(--cyan);
  font-weight: 800;
}

.learning-grid,
.timeline-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.learning-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.wide-panel {
  grid-column: 1 / -1;
}

ul,
ol {
  margin: 0.75rem 0 0;
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.4rem;
}

.cycle-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  list-style: none;
  padding: 0;
}

.cycle-list li {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 1rem;
}

.cycle-list strong,
.cycle-list span {
  display: block;
}

.cycle-list strong {
  color: var(--soft);
  margin-bottom: 0.35rem;
}

@media (max-width: 1050px) {
  .hero,
  .resource-grid,
  .resource-grid.six,
  .topic-grid,
  .term-list,
  .learning-grid.three,
  .cycle-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 0.75rem, 1180px);
    padding: 0.75rem 0.4rem;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    width: 100%;
  }

  .top-nav a {
    flex: 1 1 auto;
  }

  .hero,
  .library-search,
  .resource-grid,
  .resource-grid.six,
  .topic-grid,
  .term-list,
  .learning-grid,
  .learning-grid.three,
  .timeline-list,
  .cycle-list {
    grid-template-columns: 1fr;
  }
}