/* ==========================================================================
   David Sargsyan AI Research Lab — Shared Editorial Stylesheet
   Division of M.A.R.S. COMPANION LLC
   ========================================================================== */

:root {
  --bg-canvas: #090a0c;
  --bg-surface: #0f1115;
  --bg-surface-elevated: #14171d;
  --text-primary: #f1efe9;
  --text-secondary: #aba79f;
  --text-muted: #76736c;
  --accent-brass: #c4a574;
  --accent-brass-bright: #dcc39a;
  --accent-brass-dim: rgba(196, 165, 116, 0.24);
  --accent-brass-subtle: rgba(196, 165, 116, 0.08);
  --border-hairline: rgba(241, 239, 233, 0.09);
  --border-strong: rgba(241, 239, 233, 0.18);

  --font-serif: "Source Serif 4", "Noto Serif Armenian", Georgia, "Times New Roman", serif;
  --font-sans: "Manrope", "Noto Sans Armenian", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --container-max: 76rem;
  --gutter: clamp(1rem, 4vw, 3.5rem);
  --ease-editorial: cubic-bezier(0.19, 1, 0.22, 1);
  --transition-fast: 200ms cubic-bezier(0.19, 1, 0.22, 1);
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.72;
  font-weight: 400;
  letter-spacing: 0.01em;
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

body.menu-open {
  overflow: hidden;
}

/* Smooth Page Entry & Language Switch Transition */
html.js-enabled body {
  opacity: 0;
  transition: opacity 320ms var(--ease-editorial);
}

html.js-enabled.is-loaded body {
  opacity: 1;
}

html.js-enabled.is-leaving body {
  opacity: 0;
  transition: opacity 200ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  html.js-enabled body {
    opacity: 1;
    transition: none;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4,
p,
dl,
dd,
ul,
ol {
  margin: 0;
}

/* Focus & Skip Link */
:focus-visible {
  outline: 2px solid var(--accent-brass);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 120;
  background: var(--accent-brass);
  color: var(--bg-canvas);
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Reveal Animations */
html.js-enabled [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 22px, 0);
  transition:
    opacity 760ms var(--ease-editorial),
    transform 820ms var(--ease-editorial);
  will-change: opacity, transform;
}

html.js-enabled [data-reveal].is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

html.js-enabled [data-reveal="rule"] {
  opacity: 1;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 920ms var(--ease-editorial);
}

html.js-enabled [data-reveal="rule"].is-visible {
  transform: scaleX(1);
}

/* ==========================================================================
   Header & Mobile Menu Drawer
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background-color: rgba(9, 10, 12, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-hairline);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--accent-brass), var(--accent-brass-bright));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  z-index: 80;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  min-height: 3.875rem;
}

@media (min-width: 1080px) {
  .header-inner {
    min-height: 4.5rem;
  }
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  flex-shrink: 0;
}

.brand-mark {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

@media (min-width: 768px) {
  .brand-mark {
    width: 30px;
    height: 30px;
  }
}

.brand-link:hover .brand-mark {
  transform: scale(1.04);
}

/* Full lab title visible without ellipsis truncation on all screen sizes */
.brand-name {
  font-family: var(--font-serif);
  font-size: clamp(0.78rem, 3.35vw, 1.125rem);
  line-height: 1.15;
  font-weight: 500;
  letter-spacing: 0.005em;
  color: var(--text-primary);
  white-space: nowrap;
}

.primary-nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

.primary-nav a {
  position: relative;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  flex-shrink: 0;
  padding-block: 0.35rem;
  transition: color var(--transition-fast);
}

.primary-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background-color: var(--accent-brass);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease-editorial);
}

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

.primary-nav a:hover::after,
.primary-nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-desktop-utility {
  display: none;
  align-items: center;
  gap: 1.25rem;
  flex-shrink: 0;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.lang-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding-inline: 0.25rem;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.lang-link:hover {
  color: var(--text-primary);
}

.lang-link[aria-current="page"] {
  color: var(--accent-brass);
  border-bottom-color: var(--accent-brass);
  font-weight: 500;
}

.lang-sep {
  color: var(--border-strong);
  user-select: none;
}

/* Mobile Menu Button */
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border: 1px solid var(--border-hairline);
  border-radius: 2px;
  background-color: var(--bg-surface);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.menu-toggle:hover {
  border-color: var(--accent-brass-dim);
  background-color: var(--bg-surface-elevated);
}

.menu-toggle-lines {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 18px;
  height: 18px;
}

.menu-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--text-primary);
  transition: transform 240ms var(--ease-editorial), opacity 180ms ease;
  transform-origin: center;
}

.menu-toggle[aria-expanded="true"] .menu-line:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-line:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

@media (min-width: 1080px) {
  .primary-nav {
    display: flex;
  }
  .header-desktop-utility {
    display: flex;
  }
  .menu-toggle {
    display: none;
  }
}

/* Mobile Drawer Panel */
.mobile-drawer {
  position: fixed;
  inset: 3.875rem 0 0 0;
  z-index: 65;
  background-color: rgba(9, 10, 12, 0.98);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-top: 1px solid var(--border-hairline);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translate3d(0, -10px, 0);
  transition:
    opacity 260ms var(--ease-editorial),
    transform 300ms var(--ease-editorial),
    visibility 260ms;
}

.mobile-drawer.is-open {
  opacity: 1;
  visibility: visible;
  transform: translate3d(0, 0, 0);
}

@media (min-width: 1080px) {
  .mobile-drawer {
    display: none;
  }
}

.mobile-drawer-inner {
  padding-block: 2rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.mobile-drawer-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent-brass);
  margin-bottom: 0.75rem;
}

.mobile-drawer-nav {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-hairline);
}

.mobile-drawer-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
  min-height: 52px;
  border-bottom: 1px solid var(--border-hairline);
  font-family: var(--font-serif);
  font-size: 1.375rem;
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.mobile-drawer-nav a .drawer-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-brass);
}

.mobile-drawer-nav a:hover {
  color: var(--accent-brass);
}

.mobile-drawer-langs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
}

.mobile-lang-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  padding: 0.85rem 0.9rem;
  min-height: 54px;
  border: 1px solid var(--border-hairline);
  background-color: var(--bg-surface);
  border-radius: 2px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.mobile-lang-btn .code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mobile-lang-btn .label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.mobile-lang-btn[aria-current="page"] {
  border-color: var(--accent-brass);
  background-color: var(--bg-surface-elevated);
}

.mobile-lang-btn[aria-current="page"] .code {
  color: var(--accent-brass);
}

.mobile-drawer-meta {
  display: grid;
  gap: 0.5rem;
  font-size: 0.84375rem;
  color: var(--text-secondary);
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-hairline);
}

.mobile-drawer-meta a {
  color: var(--accent-brass);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

/* ==========================================================================
   Hero — Full-Measure Editorial Title + Split Specification & Instrument
   ========================================================================== */
.hero {
  position: relative;
  padding-top: clamp(2.5rem, 6.5vw, 6.5rem);
  padding-bottom: clamp(3rem, 6.5vw, 6rem);
}

.hero-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.65rem;
  font-family: var(--font-mono);
  font-size: clamp(0.6875rem, 2.3vw, 0.78rem);
  letter-spacing: 0.04em;
  color: var(--accent-brass);
  margin-bottom: 1.5rem;
}

.hero-eyebrow .sep {
  color: var(--text-muted);
}

.hero-headline-wrap {
  max-width: 62rem;
  margin-bottom: clamp(1.75rem, 4vw, 3.5rem);
}

.hero-lab-name {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 4.9vw, 4.35rem);
  line-height: 1.09;
  font-weight: 500;
  letter-spacing: -0.018em;
  color: var(--text-primary);
  text-wrap: balance;
  overflow-wrap: break-word;
}

.hero-rule {
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, var(--accent-brass-dim), var(--border-hairline) 75%, transparent);
  margin-bottom: clamp(1.75rem, 4vw, 3.25rem);
}

.hero-body-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2.25rem, 5vw, 4.5rem);
  align-items: start;
}

@media (min-width: 920px) {
  .hero-body-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

.hero-lead {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  max-width: 58ch;
  color: var(--text-secondary);
  font-size: clamp(0.96875rem, 1.4vw, 1.0625rem);
  line-height: 1.76;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 46px;
  padding: 0.72rem 1.5rem;
  background-color: var(--accent-brass);
  color: #090a0c;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid var(--accent-brass);
  border-radius: 2px;
  white-space: nowrap;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.btn-primary:hover {
  background-color: var(--accent-brass-bright);
  border-color: var(--accent-brass-bright);
  transform: translate3d(0, -1px, 0);
}

.link-subtle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 0.15rem;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.link-subtle .arrow {
  display: inline-block;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.link-subtle:hover {
  color: var(--accent-brass);
  border-bottom-color: var(--accent-brass);
}

.link-subtle:hover .arrow {
  transform: translate3d(2px, -2px, 0);
}

/* Architectural Instrument & Invariants Column */
.hero-instrument {
  border-top: 1px solid var(--border-hairline);
  padding-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (min-width: 920px) {
  .hero-instrument {
    border-top: none;
    border-left: 1px solid var(--border-hairline);
    padding-top: 0;
    padding-left: clamp(2rem, 4vw, 3.25rem);
  }
}

.instrument-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.instrument-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.instrument-title {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2vw, 1.375rem);
  font-weight: 500;
  color: var(--text-primary);
}

.instrument-svg {
  width: 72px;
  height: 72px;
  flex-shrink: 0;
}

@media (min-width: 640px) {
  .instrument-svg {
    width: 88px;
    height: 88px;
  }
}

.orbit-cw {
  transform-origin: 44px 44px;
  animation: rotate-cw 48s linear infinite;
}

.orbit-ccw {
  transform-origin: 44px 44px;
  animation: rotate-ccw 72s linear infinite;
}

.core-pulse {
  transform-origin: 44px 44px;
  animation: breathe 4.8s ease-in-out infinite;
}

@keyframes rotate-cw {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes rotate-ccw {
  from {
    transform: rotate(360deg);
  }
  to {
    transform: rotate(0deg);
  }
}

@keyframes breathe {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(0.96);
  }
  50% {
    opacity: 1;
    transform: scale(1.04);
  }
}

.spec-ledger {
  display: grid;
  gap: 0.85rem;
}

.spec-row {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border-hairline);
}

@media (min-width: 480px) {
  .spec-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
    gap: 1.25rem;
  }
}

.spec-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.spec-row dt {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.spec-row dd {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 480px) {
  .spec-row dd {
    text-align: right;
  }
}

/* ==========================================================================
   Key Facts Band
   ========================================================================== */
.facts-section {
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-surface);
}

.facts-grid {
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .facts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .facts-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.fact-cell {
  position: relative;
  padding: clamp(1.5rem, 3.2vw, 2.5rem) clamp(0.25rem, 2vw, 2rem);
  border-bottom: 1px solid var(--border-hairline);
  transition: background-color var(--transition-fast);
}

@media (min-width: 640px) {
  .fact-cell {
    padding: clamp(1.75rem, 3.2vw, 2.5rem) clamp(1.25rem, 2.5vw, 2rem);
  }
}

.fact-cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--accent-brass);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 360ms var(--ease-editorial);
}

.fact-cell:hover {
  background-color: var(--bg-surface-elevated);
}

.fact-cell:hover::before {
  transform: scaleX(1);
}

.fact-cell:last-child {
  border-bottom: none;
}

@media (min-width: 640px) {
  .fact-cell {
    border-right: 1px solid var(--border-hairline);
  }
  .fact-cell:nth-child(2n) {
    border-right: none;
  }
  .fact-cell:nth-last-child(-n + 2) {
    border-bottom: none;
  }
}

@media (min-width: 1024px) {
  .fact-cell {
    border-bottom: none;
    border-right: 1px solid var(--border-hairline);
  }
  .fact-cell:nth-child(2n) {
    border-right: 1px solid var(--border-hairline);
  }
  .fact-cell:last-child {
    border-right: none;
  }
}

.fact-value {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  line-height: 1;
  font-weight: 500;
  color: var(--accent-brass);
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.75rem;
}

.fact-label {
  font-size: 0.96875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.fact-detail {
  font-size: 0.84375rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ==========================================================================
   Editorial Sections — Consistent Left Spine & Generous Rhythm
   ========================================================================== */
.section {
  padding-block: clamp(3.5rem, 7.5vw, 7rem);
  border-bottom: 1px solid var(--border-hairline);
}

.section-header {
  max-width: 48rem;
  margin-bottom: clamp(2rem, 4.5vw, 3.5rem);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-brass);
  letter-spacing: 0.06em;
  margin-bottom: 0.65rem;
  font-variant-numeric: tabular-nums;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.3vw, 2.75rem);
  line-height: 1.15;
  font-weight: 500;
  color: var(--text-primary);
  text-wrap: balance;
  margin-bottom: 1.15rem;
}

.section-rule {
  height: 1px;
  width: 4.5rem;
  background-color: var(--accent-brass);
  margin-bottom: 1.15rem;
}

.section-intro {
  font-size: clamp(0.96875rem, 1.4vw, 1.0625rem);
  color: var(--text-secondary);
  line-height: 1.72;
  max-width: 58ch;
}

/* ==========================================================================
   About & Corporate Registry
   ========================================================================== */
.about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

@media (min-width: 920px) {
  .about-layout {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

.about-prose {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 58ch;
  color: var(--text-secondary);
  font-size: clamp(0.96875rem, 1.4vw, 1.0625rem);
  line-height: 1.78;
}

.about-prose strong {
  color: var(--text-primary);
  font-weight: 600;
}

.registry-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: clamp(1.35rem, 3.2vw, 2.5rem);
}

.registry-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-hairline);
}

.registry-dl {
  display: grid;
  gap: 0.9rem;
}

.registry-row {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border-hairline);
}

.registry-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

@media (min-width: 540px) {
  .registry-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
    gap: 1.5rem;
  }
}

.registry-row dt {
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.registry-row dd {
  font-size: 0.875rem;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 540px) {
  .registry-row dd {
    text-align: right;
  }
}

.registry-mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

/* ==========================================================================
   Research Tracks — Interactive Hairline Grid with Brass Sheen
   ========================================================================== */
.tracks-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--border-hairline);
}

@media (min-width: 720px) {
  .tracks-grid {
    grid-template-columns: repeat(2, 1fr);
    border-left: 1px solid var(--border-hairline);
  }
}

@media (min-width: 1080px) {
  .tracks-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.track-item {
  position: relative;
  padding: clamp(1.5rem, 3.2vw, 2.5rem) 0;
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-canvas);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  overflow: hidden;
  transition: background-color 260ms var(--ease-editorial);
}

@media (min-width: 720px) {
  .track-item {
    padding: clamp(1.75rem, 3.2vw, 2.5rem);
    border-right: 1px solid var(--border-hairline);
  }
}

.track-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    420px circle at var(--mx, 50%) var(--my, 50%),
    rgba(196, 165, 116, 0.075),
    transparent 65%
  );
  opacity: 0;
  transition: opacity 280ms ease;
  pointer-events: none;
}

.track-item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--accent-brass);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 360ms var(--ease-editorial);
}

.track-item:hover {
  background-color: var(--bg-surface);
}

.track-item:hover::before {
  opacity: 1;
}

.track-item:hover::after {
  transform: scaleX(1);
}

.track-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-brass);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.track-title {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2vw, 1.35rem);
  line-height: 1.25;
  font-weight: 500;
  color: var(--text-primary);
}

.track-desc {
  font-size: 0.9375rem;
  line-height: 1.66;
  color: var(--text-secondary);
}

/* ==========================================================================
   Companion Systems
   ========================================================================== */
.systems-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 860px) {
  .systems-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.75rem;
  }
}

.system-card {
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: clamp(1.5rem, 3.8vw, 3rem);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  overflow: hidden;
  transition:
    border-color 280ms var(--ease-editorial),
    transform 320ms var(--ease-editorial);
}

.system-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    520px circle at var(--mx, 50%) var(--my, 50%),
    rgba(196, 165, 116, 0.065),
    transparent 65%
  );
  opacity: 0;
  transition: opacity 280ms ease;
  pointer-events: none;
}

.system-card:hover {
  border-color: var(--accent-brass-dim);
  transform: translate3d(0, -2px, 0);
}

.system-card:hover::before {
  opacity: 1;
}

.system-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-brass);
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
}

.system-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 2.6vw, 2.15rem);
  line-height: 1.14;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.system-desc {
  font-size: 0.96875rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.system-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.system-link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-brass);
  border-top: 1px solid var(--border-hairline);
  padding-top: 1.25rem;
  transition: color var(--transition-fast);
}

.system-link .arrow {
  display: inline-block;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.system-link:hover {
  color: var(--accent-brass-bright);
}

.system-link:hover .arrow {
  transform: translate3d(3px, -3px, 0);
}

/* ==========================================================================
   Team Directory
   ========================================================================== */
.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--border-hairline);
}

@media (min-width: 720px) {
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    border-left: 1px solid var(--border-hairline);
  }
}

@media (min-width: 1080px) {
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.team-member {
  position: relative;
  padding: clamp(1.5rem, 3vw, 2.35rem) 0;
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-canvas);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  overflow: hidden;
  transition: background-color 260ms var(--ease-editorial);
}

@media (min-width: 720px) {
  .team-member {
    padding: clamp(1.75rem, 3vw, 2.35rem);
    border-right: 1px solid var(--border-hairline);
  }
}

.team-member::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    380px circle at var(--mx, 50%) var(--my, 50%),
    rgba(196, 165, 116, 0.06),
    transparent 65%
  );
  opacity: 0;
  transition: opacity 280ms ease;
  pointer-events: none;
}

.team-member:hover {
  background-color: var(--bg-surface);
}

.team-member:hover::before {
  opacity: 1;
}

.team-member-subject {
  background-color: var(--bg-surface);
  padding-inline: 1.25rem;
}

@media (min-width: 720px) {
  .team-member-subject {
    padding-inline: clamp(1.75rem, 3vw, 2.35rem);
  }
}

.team-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-brass);
  letter-spacing: 0.03em;
  margin-bottom: 0.5rem;
}

.team-name {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2vw, 1.425rem);
  line-height: 1.22;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
}

.team-bio {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.team-note {
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-hairline);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.team-directory-link {
  margin-top: 2rem;
  display: flex;
  justify-content: flex-start;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-surface);
  padding-block: clamp(3rem, 6vw, 4.75rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem 3rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--border-hairline);
}

@media (min-width: 860px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.9fr) minmax(0, 0.9fr);
  }
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
}

.footer-status {
  font-size: 0.9rem;
  line-height: 1.68;
  color: var(--text-secondary);
  max-width: 44ch;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-brass);
  letter-spacing: 0.05em;
  margin-bottom: 0.85rem;
}

.footer-legal {
  display: grid;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.footer-links {
  display: grid;
  gap: 0.45rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-brass);
}

.footer-bottom {
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 2rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-bottom-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}