:root {
  --bg-canvas: #201727;
  --bg-surface: #302439;
  --bg-surface-hover: #3d2e48;
  --text-primary: #f4f1ea;
  --text-muted: #c2b8cc;
  --accent-primary: #d4a84b;
  --accent-secondary: #e5be6d;
  --border-subtle: rgba(212, 168, 75, 0.28);
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-elevation: 0 12px 32px -4px rgba(0, 0, 0, 0.35);
  --glow-accent: 0 0 24px -4px rgba(212, 168, 75, 0.3);
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, Consolas, "Courier New", monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.65;
  font-size: 16px;
  overflow-wrap: anywhere;
  hyphens: auto;
}

a {
  color: var(--accent-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

a:hover, a:focus-visible {
  color: var(--accent-secondary);
}

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

.site-header {
  position: relative;
  background-color: var(--bg-canvas);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.25rem 1.5rem;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.brand-bar {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.brand-mark {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background-color: var(--accent-primary);
  color: #16101b;
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  font-weight: 700;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1.35rem;
  line-height: 1;
  padding: 0.35rem 0.65rem;
  border-radius: 4px;
  cursor: pointer;
}

.primary-nav {
  width: 100%;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  align-items: center;
}

.nav-list a {
  text-decoration: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover, .nav-list a[aria-current="page"] {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.hero-band {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-meta {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.hero-band h1 {
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.hero-intro {
  max-width: 70ch;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1rem;
}

.btn-pill {
  display: inline-block;
  background-color: var(--accent-primary);
  color: #16101b;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  border: none;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s var(--ease-kinetic), background-color 0.2s ease, box-shadow 0.2s ease;
}

.btn-pill:hover, .btn-pill:focus-visible {
  background-color: var(--accent-secondary);
  color: #16101b;
  transform: translateY(-2px);
  box-shadow: var(--glow-accent);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--accent-primary);
  border: 1px solid var(--accent-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  color: var(--accent-secondary);
}

.ledger-stream {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem 4rem;
}

.ledger-chapter {
  position: relative;
  padding: 2.75rem 0 2.75rem 2.25rem;
  border-left: 2px solid var(--accent-primary);
  margin-left: 0.75rem;
}

.ledger-chapter.surface-alt {
  background-color: var(--bg-surface);
  padding: 3.25rem 2rem 3.25rem 2.25rem;
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  clip-path: polygon(0 18px, 100% 0, 100% calc(100% - 18px), 0 100%);
}

.chapter-marker {
  position: absolute;
  left: -0.65rem;
  top: 2.95rem;
  width: 1.2rem;
  height: 1.2rem;
  background-color: var(--bg-canvas);
  border: 2px solid var(--accent-primary);
  border-radius: 50%;
}

.chapter-number {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.35rem;
}

.ledger-chapter h2 {
  font-size: clamp(1.4rem, 2.5vw, 1.95rem);
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.ledger-chapter h3 {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--accent-primary);
  margin: 1.5rem 0 0.5rem;
}

.prose-measure {
  max-width: 70ch;
}

.prose-measure p {
  margin-bottom: 1.1rem;
}

.field-split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  align-items: start;
  margin-top: 1.5rem;
}

.field-figure {
  margin: 1.25rem 0;
}

.field-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  object-fit: cover;
  border: 1px solid var(--border-subtle);
  display: block;
}

.aspect-16-9 {
  aspect-ratio: 16 / 9;
}

.aspect-4-3 {
  aspect-ratio: 4 / 3;
}

.field-caption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--border-subtle);
}

.explanatory-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  max-width: 70ch;
}

.surface-alt .explanatory-panel {
  background-color: var(--bg-canvas);
}

.panel-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 0.4rem;
}

.icon-ledger-list {
  list-style: none;
  margin: 1.5rem 0;
  border-top: 1px solid var(--border-subtle);
}

.icon-ledger-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.15rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--border-subtle);
  align-items: start;
}

.row-icon {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.9rem;
  padding-top: 0.15rem;
  min-width: 3.2rem;
}

.row-content h4 {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.row-content p {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 68ch;
}

.cross-section-diagram {
  background-color: #18111d;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.diagram-header {
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
  border-bottom: 1px dashed var(--border-subtle);
  padding-bottom: 0.4rem;
}

.diagram-strata {
  display: grid;
  gap: 0.5rem;
}

.stratum-band {
  padding: 0.6rem 0.85rem;
  border-left: 3px solid var(--accent-primary);
  background-color: rgba(255, 255, 255, 0.03);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

details.field-glossary {
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 0;
  max-width: 70ch;
}

details.field-glossary summary {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

details.field-glossary summary::-webkit-details-marker {
  display: none;
}

details.field-glossary summary::before {
  content: "[+] ";
  color: var(--text-muted);
}

details.field-glossary[open] summary::before {
  content: "[-] ";
}

details.field-glossary p {
  margin-top: 0.6rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  padding-left: 1.5rem;
}

.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
}

table.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

.ledger-table th, .ledger-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.ledger-table th {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  background-color: var(--bg-surface);
}

.field-form {
  max-width: 65ch;
  display: grid;
  gap: 1.15rem;
  margin-top: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
}

.form-input, .form-textarea, .form-select {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 0.65rem 0.85rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.output-box {
  background-color: #16101b;
  border: 1px solid var(--accent-primary);
  border-radius: 4px;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
  margin-top: 1rem;
  color: var(--text-primary);
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.reveal-item {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s var(--ease-kinetic), transform 0.6s var(--ease-kinetic);
}

.js-enabled .reveal-item:not(.reveal-visible) {
  opacity: 0;
  transform: translateY(16px);
}

.site-footer {
  background-color: #17101c;
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 1.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.footer-col h4 {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 0.5rem;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: inline-block;
  }
  .primary-nav {
    display: none;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-subtle);
  }
  .primary-nav.is-open {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .ledger-chapter {
    padding-left: 1.35rem;
    margin-left: 0.35rem;
  }
  .ledger-chapter.surface-alt {
    padding-left: 1.35rem;
    padding-right: 1rem;
  }
}

@media (prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}