:root {
  --bg-canvas: #1e1612;
  --bg-surface: #30231c;
  --bg-surface-hover: #3d2d24;
  --text-primary: #f5ecdf;
  --text-muted: #cbbba6;
  --accent-primary: #f59e0b;
  --accent-secondary: #d97706;
  --border-subtle: #523d31;
  --font-heading: "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius: 4px;
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-wrap: anywhere;
  hyphens: auto;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  line-height: 1.15;
  margin-top: 0;
  color: var(--text-primary);
}

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

a:hover, a:focus-visible {
  color: var(--text-primary);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.prose {
  max-width: 70ch;
  margin: 0 auto;
}

/* Header - Non-sticky, Far-left brand */
.site-header {
  position: relative;
  width: 100%;
  background-color: transparent;
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.3s ease;
  z-index: 20;
}

.site-header.scrolled {
  background-color: var(--bg-surface);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  margin-right: auto;
}

.brand-mark {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid var(--accent-primary);
  background-color: var(--bg-surface);
  border-radius: 2px;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-desktop a {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  color: var(--text-primary);
  padding: 0.35rem 0.5rem;
  border: 1px solid transparent;
}

.nav-desktop a:hover,
.nav-desktop a[aria-current="page"] {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--accent-primary);
  color: var(--accent-primary);
  font-size: 1.25rem;
  line-height: 1;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
  border-radius: 0;
}

.nav-mobile {
  display: none;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--accent-primary);
  padding: 1rem 1.25rem;
}

.nav-mobile.open {
  display: block;
}

.nav-mobile ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.nav-mobile a {
  display: block;
  padding: 0.5rem;
  border: 1px solid var(--border-subtle);
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

/* Hero - Solid Espresso, No Image */
.hero-solid {
  background-color: var(--bg-canvas);
  padding: 4.5rem 0 4rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-kicker {
  display: inline-block;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.85rem;
  color: var(--accent-primary);
  border: 1px solid var(--accent-primary);
  padding: 0.25rem 0.65rem;
  margin-bottom: 1.25rem;
}

.hero-solid h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.5rem);
  letter-spacing: 0.12em;
  margin-bottom: 1.25rem;
  max-width: 18ch;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 66ch;
  margin-bottom: 2rem;
}

/* Buttons - Amber outline, square ends, uppercase wide spacing */
.btn {
  display: inline-block;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.75rem 1.35rem;
  border: 1px solid var(--accent-primary);
  background-color: transparent;
  color: var(--accent-primary);
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.btn:hover, .btn:focus-visible {
  background-color: var(--accent-primary);
  color: var(--bg-canvas);
  text-decoration: none;
}

.btn-solid {
  background-color: var(--accent-primary);
  color: var(--bg-canvas);
}

.btn-solid:hover, .btn-solid:focus-visible {
  background-color: transparent;
  color: var(--accent-primary);
}

/* Clipped Diagonal / Angled Sections */
.section-block {
  padding: 4rem 0;
  position: relative;
}

.section-surface {
  background-color: var(--bg-surface);
  clip-path: polygon(0 24px, 100% 0, 100% calc(100% - 24px), 0 100%);
  padding: 5rem 0;
  margin: 1rem 0;
}

.section-header {
  margin-bottom: 2rem;
  border-left: 3px solid var(--accent-primary);
  padding-left: 1rem;
}

.section-header h2 {
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--text-muted);
  margin: 0;
  max-width: 68ch;
}

/* Stat Strip */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0;
  padding: 0.85rem;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
}

.stat-cell {
  border-left: 2px solid var(--accent-primary);
  padding-left: 0.75rem;
}

.stat-label {
  display: block;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.stat-val {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

/* Flat 1px Bordered Panels - No Shadows */
.workbench-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.panel-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.section-surface .panel-card {
  background-color: var(--bg-canvas);
}

.panel-card:hover {
  border-color: var(--accent-primary);
  background-color: var(--bg-surface-hover);
}

.panel-tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
}

.panel-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.65rem;
}

.panel-card p {
  color: var(--text-muted);
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.vector-frame {
  margin-bottom: 1.15rem;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-canvas);
}

.vector-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: none;
}

/* Technique Tabs */
.tabs-workbench {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  background-color: var(--bg-surface);
  margin-top: 1.5rem;
}

.tab-buttons {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-canvas);
}

.tab-btn {
  background: transparent;
  border: none;
  border-right: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.9rem;
  padding: 0.85rem 1.25rem;
  cursor: pointer;
}

.tab-btn[aria-selected="true"] {
  background-color: var(--bg-surface);
  color: var(--accent-primary);
  border-bottom: 2px solid var(--accent-primary);
}

.tab-panel {
  padding: 1.5rem;
  display: none;
}

.tab-panel.active {
  display: block;
}

/* Accordions */
.accordion-list {
  display: grid;
  gap: 0.75rem;
}

.accordion-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  background-color: var(--bg-surface);
}

.accordion-trigger {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 1.05rem;
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.accordion-trigger:hover {
  color: var(--accent-primary);
}

.accordion-icon {
  color: var(--accent-primary);
  font-weight: 700;
}

.accordion-content {
  display: none;
  padding: 0 1.25rem 1.25rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
}

.accordion-item.open .accordion-content {
  display: block;
  padding-top: 1rem;
}

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

.sub-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-surface);
  text-align: left;
}

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

.sub-table th {
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-primary);
  background-color: var(--bg-canvas);
}

/* Forms */
.form-grid {
  display: grid;
  gap: 1.25rem;
}

.form-group label {
  display: block;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

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

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.output-box {
  background-color: var(--bg-canvas);
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius);
  padding: 1rem;
  white-space: pre-wrap;
  font-family: monospace;
  color: var(--text-primary);
  margin-top: 1rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  padding: 3rem 0 2rem;
  margin-top: 4rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.45rem;
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .menu-toggle {
    display: inline-block;
  }
  .section-surface {
    clip-path: none;
    padding: 3.5rem 0;
  }
}

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