:root {
  --bg-canvas: #25182d;
  --bg-surface: #33233c;
  --bg-surface-hover: #3f2b4a;
  --text-primary: #f4f1ea;
  --text-muted: #c8bfd0;
  --accent-primary: #d4a84b;
  --accent-secondary: #e5be6b;
  --border-subtle: rgba(212, 168, 75, 0.35);
  --shadow-offset: 4px 4px 0px #150d1a;
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  border-radius: 0 !important;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  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: 2px;
}

.site-header {
  position: relative;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-canvas);
  padding: 1.25rem 1.5rem 0;
}

.header-top {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  background: var(--accent-primary);
  color: var(--bg-canvas);
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.95rem;
  border: 1px solid var(--text-primary);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-surface);
  color: var(--accent-primary);
  border: 1px solid var(--accent-primary);
  padding: 0.4rem 0.75rem;
  font-size: 1.25rem;
  font-family: var(--font-mono);
  cursor: pointer;
}

.nav-row {
  border-top: 1px solid var(--border-subtle);
  padding: 0.75rem 0;
}

.main-nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.25rem;
  flex-wrap: wrap;
}

.main-nav a {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--text-primary);
  padding: 0.25rem 0.5rem;
  border-bottom: 2px solid transparent;
}

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

.hero-solid {
  background-color: var(--bg-canvas);
  border-bottom: 1px solid var(--border-subtle);
  padding: 5rem 1.5rem 4.5rem;
  position: relative;
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.exp-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  border: 1px solid var(--accent-primary);
  padding: 0.25rem 0.65rem;
  margin-bottom: 1.25rem;
  background: var(--bg-surface);
}

h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.5rem);
  line-height: 1.08;
  margin: 0 0 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  max-width: 18ch;
}

.hero-lead {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 66ch;
  margin: 0 0 2rem;
}

.btn-gold {
  display: inline-block;
  background-color: var(--accent-primary);
  color: #150d1a;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1.6rem;
  text-decoration: none;
  border: 1px solid var(--text-primary);
  box-shadow: 4px 4px 0px #0f0913;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
  cursor: pointer;
}

.btn-gold:hover,
.btn-gold:focus-visible {
  background-color: var(--accent-secondary);
  color: #150d1a;
  transform: translate(4px, 4px);
  box-shadow: 0px 0px 0px #0f0913;
}

.btn-outline {
  display: inline-block;
  background-color: var(--bg-surface);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.8rem 1.4rem;
  text-decoration: none;
  border: 1px solid var(--accent-primary);
  box-shadow: 4px 4px 0px #0f0913;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  cursor: pointer;
}

.btn-outline:hover,
.btn-outline:focus-visible {
  transform: translate(4px, 4px);
  box-shadow: 0px 0px 0px #0f0913;
  background-color: var(--bg-surface-hover);
}

.lab-stream {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  position: relative;
}

.exp-stage {
  position: relative;
  padding-left: 3.5rem;
  padding-bottom: 4.5rem;
  border-left: 1px solid var(--accent-primary);
  margin-left: 1rem;
}

.exp-stage:last-child {
  padding-bottom: 1rem;
}

.exp-stage.radial-glow {
  background-image: radial-gradient(circle at 20% 30%, rgba(212, 168, 75, 0.14) 0%, rgba(37, 24, 45, 0) 65%);
}

.stage-node {
  position: absolute;
  left: -1.15rem;
  top: 0;
  width: 2.25rem;
  height: 2.25rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--accent-primary);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}

.stage-meta {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  margin: 0 0 1rem;
  line-height: 1.2;
  color: var(--text-primary);
}

h3 {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--accent-primary);
  margin: 1.75rem 0 0.6rem;
  letter-spacing: 0.02em;
}

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

.prose-copy p {
  margin: 0 0 1.2rem;
}

.rule-list {
  margin: 2rem 0;
  border-top: 1px solid var(--border-subtle);
}

.rule-row {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 1.25rem;
  align-items: start;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.rule-icon {
  width: 48px;
  height: 48px;
  background-color: var(--bg-surface);
  border: 1px solid var(--accent-primary);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 700;
}

.rule-content h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.rule-content p {
  margin: 0;
  color: var(--text-muted);
  max-width: 65ch;
}

.rule-metric {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 0.65rem;
  white-space: nowrap;
}

.diagram-frame {
  margin: 2rem 0;
  background-color: var(--bg-surface);
  border: 1px solid var(--accent-primary);
  padding: 1.25rem;
  max-width: 820px;
}

.diagram-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-canvas);
}

.diagram-caption {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-subtle);
}

.table-wrap {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--accent-primary);
  background-color: var(--bg-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

th, td {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
}

th {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-primary);
  background-color: rgba(37, 24, 45, 0.7);
}

tr:hover td {
  background-color: var(--bg-surface-hover);
}

.trouble-tree {
  margin: 2rem 0;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  padding: 1.5rem;
}

.tree-branch {
  padding: 1rem 0 1rem 1.25rem;
  border-left: 2px solid var(--accent-primary);
  margin-bottom: 1rem;
}

.tree-branch:last-child {
  margin-bottom: 0;
}

.tree-symptom {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 0.35rem;
}

.tree-cause {
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.tree-fix {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.interactive-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--accent-primary);
  padding: 1.75rem;
  margin: 2rem 0;
  max-width: 760px;
}

.form-row {
  margin-bottom: 1.25rem;
}

.form-row label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
}

.form-row input,
.form-row select,
.form-row textarea {
  width: 100%;
  padding: 0.75rem;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: var(--accent-primary);
  outline: none;
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.output-log {
  margin-top: 1.25rem;
  padding: 1rem;
  background-color: var(--bg-canvas);
  border: 1px solid var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  white-space: pre-wrap;
  color: var(--text-primary);
}

.faq-item {
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.25rem 0;
}

.faq-q {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin: 0 0 0.5rem;
}

.faq-a {
  margin: 0;
  color: var(--text-primary);
  max-width: 70ch;
}

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

.js-enabled .reveal-item {
  opacity: 0;
  transform: translateY(16px);
}

.js-enabled .reveal-item.reveal-visible {
  opacity: 1;
  transform: translateY(0);
}

.site-footer {
  border-top: 1px solid var(--accent-primary);
  background-color: #1c1222;
  padding: 3.5rem 1.5rem 2.5rem;
  font-size: 0.92rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2.5rem;
}

.footer-col h4 {
  font-family: var(--font-mono);
  color: var(--accent-primary);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  margin: 0 0 1rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-bottom {
  max-width: 1200px;
  margin: 2.5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: inline-block;
  }
  .nav-row {
    display: none;
  }
  .nav-row.nav-open {
    display: block;
  }
  .main-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem 0;
  }
  .rule-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .exp-stage {
    padding-left: 2rem;
    margin-left: 0.5rem;
  }
}

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