:root {
  --bg-canvas: #1e1612;
  --bg-surface: #2a201a;
  --bg-surface-translucent: rgba(42, 32, 26, 0.88);
  --bg-amber-band: #2d1e14;
  --text-primary: #f5ecdf;
  --text-muted: #c4b5a5;
  --accent-primary: #f59e0b;
  --accent-hover: #d97706;
  --border-subtle: rgba(245, 158, 11, 0.22);
  --border-strong: #f59e0b;
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-elevation: 0 12px 32px -4px rgba(0, 0, 0, 0.45);
  --glow-accent: 0 0 24px -4px rgba(245, 158, 11, 0.35);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-canvas);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-canvas);
  line-height: 1.6;
  overflow-wrap: anywhere;
  hyphens: auto;
}

/* Headings in Arial Narrow / Condensed geometric */
h1, h2, h3, h4, .dimension-tag, .nav-link, .btn, .site-brand {
  font-family: "Arial Narrow", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.08;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  line-height: 1.15;
  margin-bottom: 1rem;
  color: var(--accent-primary);
}

h3 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.2rem;
  color: var(--text-muted);
}

strong {
  color: var(--text-primary);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.2s var(--ease-kinetic);
}

a:hover, a:focus-visible {
  color: #fbbf24;
}

/* Header & Navigation: Left-anchored brand, relative flow (moves up on scroll) */
.site-header {
  position: relative;
  width: 100%;
  background: #18110e;
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-brand {
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  white-space: nowrap;
}

.brand-marker {
  display: inline-block;
  width: 14px;
  height: 14px;
  background-color: var(--accent-primary);
  border-radius: 50%;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.88rem;
  color: var(--text-primary);
  padding: 0.4rem 0.2rem;
  position: relative;
}

.nav-link:hover, .nav-link:focus-visible, .nav-link.active {
  color: var(--accent-primary);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1.5rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  line-height: 1;
}

/* Layout bands & alternating splits */
.band-espresso {
  background-color: var(--bg-canvas);
  padding: 4.5rem 1.5rem;
}

.band-tinted {
  background-color: var(--bg-amber-band);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 4.5rem 1.5rem;
}

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

.prose-block {
  max-width: 72ch;
  margin: 0 auto;
}

/* Alternating split screen */
.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.split-section.reverse {
  direction: rtl;
}

.split-section.reverse > * {
  direction: ltr;
}

.split-visual {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 0;
  overflow: hidden;
  box-shadow: var(--shadow-elevation);
}

.split-visual img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  display: block;
  filter: contrast(105%) brightness(92%);
  transition: transform 0.6s var(--ease-kinetic);
}

.split-visual:hover img {
  transform: scale(1.02);
}

.spatial-badge {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 82px;
  height: 82px;
  border-radius: 50%;
  background: var(--accent-primary);
  color: #120b08;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: "Arial Narrow", sans-serif;
  font-weight: 700;
  box-shadow: 0 4px 18px rgba(0,0,0,0.4);
  z-index: 2;
  text-align: center;
  line-height: 1.05;
}

.spatial-badge .num {
  font-size: 1.25rem;
}

.spatial-badge .unit {
  font-size: 0.65rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.9rem 1.8rem;
  font-size: 0.85rem;
  border-radius: 0;
  border: 2px solid var(--accent-primary);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.25s var(--ease-kinetic);
  text-align: center;
}

.btn:hover, .btn:focus-visible {
  background: var(--accent-primary);
  color: #18110e;
  box-shadow: var(--glow-accent);
}

.btn-solid {
  background: var(--accent-primary);
  color: #18110e;
}

.btn-solid:hover, .btn-solid:focus-visible {
  background: #fbbf24;
  border-color: #fbbf24;
  color: #120b08;
}

/* Frosted glass cards */
.frosted-card {
  background: var(--bg-surface-translucent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: 0;
  padding: 2.2rem;
  transition: transform 0.3s var(--ease-kinetic), border-color 0.3s ease;
}

.frosted-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 2rem;
}

/* Circular dimension tags for quick metric readouts */
.badge-row {
  display: flex;
  gap: 1.5rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.circle-badge {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--bg-surface);
  border: 2px solid var(--accent-primary);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Arial Narrow", sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
}

.badge-meta {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* Data matrices & tables */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.clearance-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.clearance-table th, .clearance-table td {
  padding: 1.1rem 1.4rem;
  border-bottom: 1px solid rgba(245, 158, 11, 0.12);
}

.clearance-table th {
  background-color: #231914;
  color: var(--accent-primary);
  font-family: "Arial Narrow", sans-serif;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.82rem;
}

.clearance-table tr:hover td {
  background: rgba(245, 158, 11, 0.05);
}

/* Interactive Calculator Module */
.calculator-panel {
  background: var(--bg-surface);
  border: 1px solid var(--accent-primary);
  padding: 2.5rem;
  margin: 2.5rem 0;
}

.form-group {
  margin-bottom: 1.4rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.8rem 1rem;
  background: #18110e;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  border-radius: 0;
  font-size: 1rem;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.3);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.calc-output {
  margin-top: 1.8rem;
  padding: 1.5rem;
  background: #18110e;
  border-left: 3px solid var(--accent-primary);
}

.calc-output pre {
  font-family: monospace;
  white-space: pre-wrap;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.action-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* Reveal utility */
.reveal-init {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease-kinetic), transform 0.7s var(--ease-kinetic);
}

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

/* Footer */
.site-footer {
  background: #120b08;
  border-top: 2px solid var(--accent-primary);
  padding: 4rem 1.5rem 2.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.footer-nav {
  list-style: none;
}

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

.footer-nav a {
  color: var(--text-muted);
}

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

.footer-legal {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(245, 158, 11, 0.15);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
}

/* Mobile responsive */
@media (max-width: 768px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #18110e;
    flex-direction: column;
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 2px solid var(--accent-primary);
    display: none;
  }

  .site-nav.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .split-section {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .split-section.reverse {
    direction: ltr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .split-visual img {
    height: 280px;
  }
}

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