/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--color-header-scrim);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 4rem;
  padding-block: var(--space-sm);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo__icon {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
}

.logo__wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.2em;
}

.logo__prompt {
  color: inherit;
}

.logo__anatomy {
  color: var(--color-brand-accent);
}

.site-footer--dark .logo {
  color: var(--color-text-on-dark);
}

.nav {
  display: none;
  gap: var(--space-lg);
}

.nav a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-small);
  font-weight: 500;
}

.nav a:hover {
  color: var(--color-text-primary);
}

/* Mobile navigation */
.nav-mobile {
  display: block;
}

.nav-mobile__trigger {
  list-style: none;
  cursor: pointer;
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--color-text-primary);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-elevated);
}

.nav-mobile__trigger::-webkit-details-marker {
  display: none;
}

.nav-mobile__panel {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: calc(var(--z-header) + 1);
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: var(--space-sm);
  background: var(--color-header-scrim);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.nav-mobile__panel a {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0 0.75rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-small);
  font-weight: 500;
}

.nav-mobile__panel a:hover {
  color: var(--color-text-primary);
}

@media (max-width: 47.99rem) {
  .site-header .btn--primary {
    max-width: 7.5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

@media (min-width: 48rem) {
  .nav-mobile {
    display: none;
  }

  .nav {
    display: flex;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: var(--text-small);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn--primary {
  background: var(--color-cta-gradient);
  color: var(--color-brand-dark);
  font-weight: 700;
  border-color: var(--color-cta-border);
  box-shadow: 0 6px 14px var(--color-cta-shadow);
}

.btn--primary:hover {
  filter: brightness(1.03);
  color: var(--color-brand-dark);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.section--dark .btn--ghost {
  border-color: var(--color-border-dark);
  color: var(--color-text-on-dark);
}

.btn--secondary {
  background: var(--color-surface-dark-card);
  color: var(--color-text-on-dark);
}

/* Hero */
.hero {
  padding-block: calc(var(--section-padding) * 1.1);
}

.hero__headline {
  font-size: var(--text-hero);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-md);
  max-width: 18ch;
}

.hero__subhead {
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  color: var(--color-text-on-dark-muted);
  max-width: 42rem;
  margin: 0 0 var(--space-lg);
}

.hero__methodology {
  font-size: var(--text-meta);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-brand-accent);
}

.hero__visual-wrap {
  display: grid;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  max-width: 56rem;
}

.hero__visual {
  width: 100%;
  border-radius: var(--radius-lg);
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: 0.92;
}

.hero__visual--secondary {
  display: none;
}

@media (min-width: 48rem) {
  .hero__visual-wrap {
    grid-template-columns: 1fr 1fr;
  }

  .hero__visual--secondary {
    display: block;
  }
}

/* Cards */
.card {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card--linked {
  position: relative;
}

.card__stretched-link {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
}

.card__stretched-link:focus-visible {
  outline: 2px solid var(--color-brand-accent);
  outline-offset: 3px;
}

.card--linked:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-strong);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-strong);
}

.card:focus-within {
  outline: 2px solid var(--color-brand-accent);
  outline-offset: 3px;
}

.section--dark .card {
  background: var(--color-surface-dark-card);
  border-color: var(--color-border-dark);
  color: var(--color-text-on-dark);
}

.card__title {
  margin: 0 0 var(--space-xs);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.card__title a {
  color: inherit;
  text-decoration: none;
}

.card__desc {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--text-small);
}

.section--dark .card__desc {
  color: var(--color-text-on-dark-muted);
}

.card--featured {
  display: grid;
  gap: var(--space-lg);
  padding: var(--space-xl);
}

@media (min-width: 48rem) {
  .card--featured {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
  }
}

.card__visual {
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  background: var(--color-card-visual-gradient);
  border: 1px solid var(--color-border-dark);
}

.card__visual--image {
  width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
  display: block;
}

.card--has-visual {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.card__thumb-link {
  display: block;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.card__thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

/* Badge */
.badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--color-badge-link-bg);
  color: var(--color-link);
  text-decoration: none;
}

.section--dark .badge {
  background: var(--color-badge-accent-bg);
  color: var(--color-brand-accent);
}

.meta-line {
  font-size: var(--text-meta);
  color: var(--color-text-muted);
}

.section--dark .meta-line {
  color: var(--color-text-on-dark-muted);
}

/* Section titles */
.section-title {
  font-size: var(--text-section);
  letter-spacing: -0.03em;
  margin: 0 0 var(--space-sm);
  line-height: var(--leading-tight);
}

.section-lead {
  margin: 0 0 var(--space-xl);
  color: var(--color-text-secondary);
  max-width: 40rem;
}

/* Template band */
.template-band {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  background: var(--color-surface-elevated);
}

/* Newsletter */
.newsletter {
  text-align: center;
  max-width: 36rem;
  margin-inline: auto;
}

.newsletter__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

@media (min-width: 36rem) {
  .newsletter__form {
    flex-direction: row;
  }
}

.newsletter__form input[type="email"] {
  flex: 1;
  min-height: 2.75rem;
  padding: 0.625rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font: inherit;
}

.newsletter__status {
  display: inline-block;
  margin: 0 0 var(--space-sm);
  padding: 0.25rem 0.625rem;
  font-size: var(--text-meta);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-brand-accent);
  border: 1px solid var(--color-border-dark);
  border-radius: 999px;
}

.newsletter--placeholder {
  opacity: 0.72;
  pointer-events: none;
}

.newsletter__note {
  font-size: var(--text-meta);
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

.section--dark .newsletter__note {
  color: var(--color-text-on-dark-muted);
}

/* Footer */
.site-footer {
  padding-block: var(--space-2xl);
}

.site-footer--dark {
  background: var(--color-brand-dark);
  color: var(--color-text-on-dark-muted);
  border-top: 1px solid var(--color-border-dark);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-xl);
}

@media (min-width: 48rem) {
  .site-footer__grid {
    grid-template-columns: 1.4fr repeat(3, 1fr);
  }
}

.site-footer__brand {
  color: var(--color-text-on-dark-muted);
  font-size: var(--text-small);
  max-width: 28rem;
  margin-top: var(--space-sm);
}

.site-footer__column-title {
  font-size: var(--text-meta);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-on-dark);
  margin: 0 0 var(--space-md);
}

.site-footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-footer__links a {
  color: var(--color-text-on-dark-muted);
  text-decoration: none;
  font-size: var(--text-small);
  font-weight: 500;
  transition: color 0.2s ease;
}

.site-footer__links a:hover {
  color: var(--color-brand-accent);
}

.site-footer__bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-dark);
  font-size: var(--text-meta);
  color: var(--color-text-on-dark-muted);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  margin-bottom: var(--space-sm);
}

.site-footer__legal a,
.site-footer__legal a:visited {
  color: var(--color-text-on-dark-muted);
  text-decoration: none;
}

.site-footer__legal a:hover {
  color: var(--color-brand-accent);
}

.site-footer__legal-sep {
  opacity: 0.5;
}

.site-footer__meta {
  margin: 0;
  line-height: 1.6;
}

/* Reading progress */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: var(--z-progress);
  background: transparent;
}

.reading-progress__bar {
  height: 100%;
  width: 0;
  background: var(--color-brand-accent);
  transition: width 0.1s linear;
}

/* Topic cluster card */
.topic-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface-elevated);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.topic-card:hover {
  border-color: var(--color-link);
  box-shadow: var(--shadow-md);
}

.topic-card:focus-visible {
  outline: 2px solid var(--color-brand-accent);
  outline-offset: 3px;
}

.topic-card__title {
  margin: 0 0 var(--space-xs);
  font-size: 1.0625rem;
}

.topic-card__desc {
  margin: 0;
  font-size: var(--text-meta);
  color: var(--color-text-muted);
}

/* Ecosystem spoke section */
.ecosystem {
  position: relative;
  overflow: hidden;
}

.ecosystem__texture {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  pointer-events: none;
  background-image: url("../noise.svg");
}

.ecosystem__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: var(--color-ecosystem-glow);
}

.ecosystem__inner {
  position: relative;
  z-index: 1;
}

.ecosystem__header {
  text-align: center;
  max-width: 40rem;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.ecosystem__map {
  width: 100%;
  max-width: 48rem;
  margin: 0 auto var(--space-lg);
  border-radius: var(--radius-lg);
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.ecosystem__header .section-lead {
  color: var(--color-text-on-dark-muted);
  margin-bottom: var(--space-lg);
}

.ecosystem__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.ecosystem-card {
  display: block;
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  background: var(--color-surface-glass);
  border: 1px solid var(--color-border-glass);
  text-decoration: none;
  color: var(--color-text-on-dark);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.ecosystem-card:hover {
  border-color: var(--color-ecosystem-hover-border);
  transform: translateY(-4px);
  box-shadow: var(--shadow-ecosystem-card);
  color: var(--color-text-on-dark);
}

.ecosystem-card:focus-visible {
  outline: 2px solid var(--color-brand-accent);
  outline-offset: 3px;
}

.ecosystem-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-on-accent);
}

.ecosystem-card__icon--1 { background: var(--color-ecosystem-1); }
.ecosystem-card__icon--2 { background: var(--color-ecosystem-2); }
.ecosystem-card__icon--3 { background: var(--color-ecosystem-3); }
.ecosystem-card__icon--4 { background: var(--color-ecosystem-4); }

.ecosystem-card__title {
  margin: 0 0 var(--space-xs);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.ecosystem-card__outcome {
  margin: 0;
  font-size: var(--text-small);
  color: var(--color-text-on-dark-muted);
  line-height: 1.5;
}