:root {
  --bg-canvas: #242528;
  --bg-surface: #343638;
  --bg-surface-hover: #3f4245;
  --bg-darker: #1b1c1e;
  --text-primary: #ffffff;
  --text-muted: #b5b8ba;
  --accent-primary: #a3e635;
  --accent-hover: #bbf451;
  --border-subtle: #484b4e;
  --border-strong: #65696d;
  --container-max: 1200px;
  --reading-width: 68ch;
  --ease-kinetic: cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  overflow-wrap: anywhere;
  hyphens: auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: "Arial Narrow", "Helvetica Neue", -apple-system, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
  font-size: 1.025rem;
}

p.lead {
  font-size: 1.25rem;
  color: var(--text-primary);
  line-height: 1.45;
}

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

a.text-link {
  position: relative;
  display: inline-block;
  color: var(--accent-primary);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.9rem;
}

a.text-link::after {
  content: '';
  position: absolute;
  width: 0%;
  height: 2px;
  bottom: -2px;
  left: 0;
  background-color: var(--accent-primary);
  transition: width 0.25s var(--ease-kinetic);
}

a.text-link:hover::after,
a.text-link:focus::after {
  width: 100%;
}

/* Header & Navigation (In-flow, static/relative, far-left logo) */
header.site-header {
  position: relative;
  width: 100%;
  background-color: transparent;
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  transition: background-color 0.3s ease;
}

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

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-logo span {
  color: var(--accent-primary);
}

.brand-mark {
  display: inline-block;
  width: 14px;
  height: 14px;
  background-color: var(--accent-primary);
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

nav.main-nav a {
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 0.25rem 0;
}

nav.main-nav a:hover,
nav.main-nav a.active {
  color: var(--accent-primary);
}

/* 3-dot Mobile Menu Toggle */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0.25rem 0.65rem;
  cursor: pointer;
}

.mobile-nav-toggle:hover {
  background-color: var(--bg-surface-hover);
  color: var(--accent-primary);
}

/* Mobile Dropdown */
.mobile-menu {
  display: none;
  background-color: var(--bg-surface);
  border-bottom: 2px solid var(--accent-primary);
  padding: 1.5rem;
}

.mobile-menu.active {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-menu a {
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 1.1rem;
  color: var(--text-primary);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-menu a:hover,
.mobile-menu a.active {
  color: var(--accent-primary);
}

/* Layout Containers & Splits */
main {
  flex: 1;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.container-narrow {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* Split Section System (Alternating Sides) */
.split-section {
  padding: 4.5rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.split-section.bg-alternate {
  background-color: var(--bg-surface);
}

.split-grid {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.split-grid.reversed {
  direction: rtl;
}

.split-grid.reversed > * {
  direction: ltr;
}

.split-content {
  max-width: 540px;
}

.split-visual {
  position: relative;
  background-color: var(--bg-darker);
  border: 1px solid var(--border-subtle);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.split-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Hero Section */
.hero-section {
  padding: 5rem 1.5rem 6rem;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-canvas);
}

.hero-grid {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-eyebrow {
  display: inline-block;
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--accent-primary);
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  margin-top: 2rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn-solid {
  display: inline-block;
  background-color: var(--accent-primary);
  color: #17181a;
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 0.95rem;
  padding: 1rem 1.75rem;
  border: 1px solid var(--accent-primary);
  cursor: pointer;
  transition: background-color 0.2s var(--ease-kinetic), border-color 0.2s var(--ease-kinetic);
}

.btn-solid:hover,
.btn-solid:focus {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #111213;
}

.btn-outline {
  display: inline-block;
  background-color: transparent;
  color: var(--text-primary);
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 0.95rem;
  padding: 1rem 1.75rem;
  border: 1px solid var(--border-strong);
  cursor: pointer;
  transition: all 0.2s var(--ease-kinetic);
}

.btn-outline:hover,
.btn-outline:focus {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Icon-Led Rows (Organized Discoveries, No Cards) */
.list-rows {
  width: 100%;
  margin: 2.5rem 0;
  border-top: 1px solid var(--border-subtle);
}

.discovery-row {
  display: grid;
  grid-template-columns: 80px 1.4fr 2fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color 0.2s var(--ease-kinetic);
}

.discovery-row:hover {
  background-color: rgba(163, 230, 53, 0.03);
}

.row-index {
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-primary);
  letter-spacing: 0.1em;
}

.row-title h3 {
  font-size: 1.15rem;
  margin-bottom: 0.25rem;
}

.row-desc p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.row-action {
  text-align: right;
}

/* Technical Data Checklist & Audio Table */
.data-table-wrapper {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-subtle);
}

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

table.acoustic-table th {
  background-color: var(--bg-darker);
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 1rem;
  border-bottom: 1px solid var(--border-strong);
  color: var(--text-primary);
}

table.acoustic-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-muted);
}

table.acoustic-table tr:hover td {
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

/* Checklist Rows */
.checklist-container {
  margin: 2rem 0;
}

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

.check-marker {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  border: 2px solid var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  font-weight: bold;
  font-size: 0.85rem;
  margin-top: 0.2rem;
}

/* SVG Vector Illustrations */
.vector-box {
  width: 100%;
  height: 100%;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-darker);
  border: 1px solid var(--border-subtle);
  padding: 1.5rem;
}

.vector-box svg {
  max-width: 100%;
  height: auto;
}

/* Interactive Contact Note Tool */
.note-tool {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 2rem;
  margin: 2.5rem 0;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-family: "Arial Narrow", "Helvetica Neue", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.85rem 1rem;
  background-color: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
}

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

textarea.form-control {
  min-height: 140px;
  resize: vertical;
}

.tool-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 1.5rem;
}

.tool-status {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--accent-primary);
  min-height: 1.2rem;
}

/* Scroll Reveal Kinetic utility */
.reveal-entry {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-kinetic), transform 0.6s var(--ease-kinetic);
}

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

/* Footer (Shared Specifications) */
footer.site-footer {
  background-color: var(--bg-darker);
  border-top: 1px solid var(--border-subtle);
  padding: 4.5rem 1.5rem 3rem;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.5fr;
  gap: 3rem;
}

.footer-brand h4 {
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.footer-nav h4, .footer-legal-data h4 {
  font-size: 0.95rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

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

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

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: 3rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .split-grid,
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .split-grid.reversed {
    direction: ltr;
  }
  .discovery-row {
    grid-template-columns: 50px 1.2fr 1.8fr;
  }
  .row-action {
    grid-column: 2 / -1;
    text-align: left;
    margin-top: 0.5rem;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  nav.main-nav {
    display: none;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .discovery-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1.25rem 0;
  }
  .row-index {
    color: var(--accent-primary);
  }
}

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