:root {
    --color-background: #ffffff;
    --color-on-background: #101418;
    --color-surface: #ffffff;
    --color-surface-secondary: #f4f7f9;
    --color-surface-tertiary: #e9eef3;
    --color-surface-elevated: #ffffff;
    --color-on-surface-secondary: #5e6a76;
    --color-primary: #f26b21;
    --color-on-primary: #08121d;
    --color-primary-text: #a83b00;
    --color-primary-text-on-dark: #ff9a62;
    --color-accent: #2457d6;
    --color-accent-text: #2457d6;
    --color-success: #138a58;
    --color-success-text: #0b6b42;
    --color-warning: #c94e0d;
    --color-navy: #08121d;
    --color-navy-raised: #102235;
    --color-on-navy: #ffffff;
    --color-outline: #dfe5eb;
    --color-outline-strong: #aeb9c4;
    --color-focus: #2457d6;
    --color-scrim: rgba(8, 18, 29, 0.62);
    --color-orange-soft: rgba(242, 107, 33, 0.12);
    --color-blue-soft: rgba(36, 87, 214, 0.1);
    --color-green-soft: rgba(19, 138, 88, 0.1);
    --color-white-soft: rgba(255, 255, 255, 0.08);
    --color-white-line: rgba(255, 255, 255, 0.16);
    --color-white-muted: rgba(255, 255, 255, 0.74);

    --font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;

    --space-2xs: 2px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-base: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    --space-5xl: 128px;

    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    --shadow-1: 0 1px 3px rgba(8, 18, 29, 0.08), 0 1px 2px rgba(8, 18, 29, 0.06);
    --shadow-2: 0 8px 24px rgba(8, 18, 29, 0.1), 0 2px 8px rgba(8, 18, 29, 0.06);
    --shadow-3: 0 24px 70px rgba(8, 18, 29, 0.16);

    --ease-standard: cubic-bezier(0.2, 0, 0, 1);
    --ease-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
    --duration-fast: 100ms;
    --duration-normal: 200ms;
    --duration-moderate: 300ms;
    --duration-slow: 500ms;

    --focus-ring: 3px solid var(--color-focus);
    --focus-offset: 3px;
    --shell: 1180px;
    --header-height: 72px;
}

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

  html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + var(--space-lg));
  }

  body {
    margin: 0;
    overflow-x: hidden;
    background: var(--color-background);
    color: var(--color-on-background);
    font-family: var(--font-family);
    font-size: 17px;
    line-height: 1.62;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  h1,
  h2,
  h3,
  p,
  blockquote,
  figure,
  dl,
  dd {
    margin: 0;
  }

  ul,
  ol {
    margin: 0;
    padding: 0;
  }

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

  img {
    height: auto;
  }

  button,
  input,
  textarea,
  select {
    font: inherit;
  }

  button,
  a {
    -webkit-tap-highlight-color: transparent;
  }

  button {
    border: 0;
  }

  a {
    color: inherit;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.18em;
  }

  summary {
    cursor: pointer;
  }

  ::selection {
    background: var(--color-primary);
    color: var(--color-on-primary);
  }

  :focus-visible {
    outline: var(--focus-ring);
    outline-offset: var(--focus-offset);
}

.shell {
    width: min(var(--shell), calc(100% - 48px));
    margin-inline: auto;
  }

  .section {
    position: relative;
    padding-block: var(--space-4xl);
  }

  .section-wash {
    background: var(--color-surface-secondary);
  }

  .section-dark {
    overflow: hidden;
    background: var(--color-navy);
    color: var(--color-on-navy);
  }

  .section-dark::before {
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(var(--color-white-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--color-white-line) 1px, transparent 1px);
    background-size: 48px 48px;
    content: "";
    opacity: 0.12;
    pointer-events: none;
  }

  .section-dark > .shell {
    position: relative;
  }

  .header-inner {
    display: flex;
    min-height: var(--header-height);
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
  }

  .hero {
    position: relative;
    overflow: hidden;
    padding-block: 88px 80px;
    background: var(--color-navy);
    color: var(--color-on-navy);
  }

  .hero::before {
    position: absolute;
    inset: 0;
    background:
      radial-gradient(circle at 86% 14%, rgba(242, 107, 33, 0.17), transparent 28%),
      linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
    background-size: auto, 40px 40px, 40px 40px;
    content: "";
    pointer-events: none;
  }

  .hero::after {
    position: absolute;
    top: 0;
    bottom: 0;
    left: calc(50% + 100px);
    width: 1px;
    background: linear-gradient(transparent, var(--color-primary), transparent);
    content: "";
    opacity: 0.7;
  }

  .hero-grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 0.86fr) minmax(480px, 1.14fr);
    gap: 56px;
    align-items: center;
  }

  .hero-copy {
    position: relative;
    z-index: 2;
  }

  .hero-visual {
    position: relative;
    z-index: 1;
    width: calc(100% + 96px);
    margin-right: -96px;
  }

  .intro-grid,
  .qualify-grid,
  .faq-layout,
  .implementation-grid {
    display: grid;
    grid-template-columns: minmax(260px, 0.62fr) minmax(0, 1fr);
    gap: 88px;
    align-items: start;
  }

  .comparison-layout,
  .lifecycle-layout,
  .operator-grid,
  .source-grid,
  .final-cta-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 72px;
    align-items: center;
  }

  .lifecycle-layout {
    grid-template-columns: minmax(0, 1.16fr) minmax(320px, 0.74fr);
  }

  .data-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(420px, 0.72fr);
    gap: 88px;
    align-items: center;
  }

  .fit-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
  }

  .footer-grid {
    display: grid;
    grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
    gap: var(--space-xl) var(--space-2xl);
    align-items: start;
  }

  .sticky-heading {
    position: sticky;
    top: calc(var(--header-height) + var(--space-xl));
  }

  .reading-column {
    display: grid;
    gap: var(--space-lg);
    max-width: 760px;
  }

  .source-grid,
  .final-cta-grid {
    align-items: start;
}

.svg-sprite {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
  }

  .skip-link {
    position: fixed;
    top: var(--space-md);
    left: var(--space-md);
    z-index: 200;
    min-height: 44px;
    padding: 10px var(--space-base);
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: var(--color-on-primary);
    font-weight: 800;
    transform: translateY(-150%);
    transition: transform var(--duration-normal) var(--ease-standard);
  }

  .skip-link:focus {
    transform: translateY(0);
  }

  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-white-line);
    background: rgba(8, 18, 29, 0.94);
    color: var(--color-on-navy);
    backdrop-filter: blur(18px) saturate(150%);
    -webkit-backdrop-filter: blur(18px) saturate(150%);
  }

  .brand {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    flex: 0 0 auto;
    color: var(--color-on-navy);
    font-size: 18px;
    font-weight: 800;
    line-height: 1;
    text-decoration: none;
  }

  .brand span {
    color: var(--color-primary-text-on-dark);
  }

  .desktop-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }

  .desktop-nav a,
  .mobile-nav a {
    position: relative;
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    padding-inline: var(--space-md);
    border-radius: var(--radius-sm);
    color: var(--color-white-muted);
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-standard), background-color var(--duration-fast) var(--ease-standard);
  }

  .desktop-nav a:hover,
  .desktop-nav a[aria-current="true"],
  .mobile-nav a:hover,
  .mobile-nav a:active {
    background: var(--color-white-soft);
    color: var(--color-on-navy);
  }

  .desktop-nav a:active,
  .mobile-nav a:active {
    transform: translateY(1px);
  }

  .mobile-nav {
    display: none;
    gap: var(--space-xs);
    padding: var(--space-sm) 24px var(--space-lg);
    border-top: 1px solid var(--color-white-line);
    background: var(--color-navy);
  }

  .js .mobile-nav[hidden] {
    display: none;
  }

  .mobile-nav a:last-child {
    justify-content: center;
    margin-top: var(--space-sm);
    background: var(--color-primary);
    color: var(--color-on-primary);
  }

  .icon-button {
    position: relative;
    display: inline-grid;
    width: 44px;
    height: 44px;
    place-items: center;
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-sm);
    background: var(--color-white-soft);
    color: var(--color-on-navy);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard);
  }

  .icon-button:hover {
    background: rgba(255, 255, 255, 0.15);
  }

  .icon-button:active {
    transform: scale(0.96);
  }

  .theme-icon-sun,
  .menu-icon-close {
    display: none;
  }

  .js .menu-toggle[aria-expanded="true"] .menu-icon-open {
    display: none;
  }

  .js .menu-toggle[aria-expanded="true"] .menu-icon-close {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .theme-toggle {
    display: none;
  }

  .js .theme-toggle {
    display: inline-grid;
  }

  .button {
    position: relative;
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 11px 20px;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 800;
    line-height: 20px;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition:
      background-color var(--duration-fast) var(--ease-standard),
      border-color var(--duration-fast) var(--ease-standard),
      box-shadow var(--duration-normal) var(--ease-standard),
      transform var(--duration-fast) var(--ease-standard);
  }

  .button::after {
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: currentColor;
    content: "";
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-fast) var(--ease-standard);
  }

  .button:hover::after {
    opacity: 0.08;
  }

  .button:active {
    transform: scale(0.98);
  }

  .button:active::after {
    opacity: 0.12;
  }

  .button-primary {
    background: var(--color-primary);
    color: var(--color-on-primary);
  }

  .button-primary:hover {
    box-shadow: var(--shadow-1);
  }

  .button-outline {
    border-color: currentColor;
    background: transparent;
    color: inherit;
  }

  .button-large {
    min-height: 50px;
    padding-inline: var(--space-lg);
    font-size: 15px;
  }

  .button-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    align-items: center;
    margin-top: var(--space-xl);
  }

  .icon {
    width: 20px;
    height: 20px;
    flex: 0 0 auto;
  }

  .breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    align-items: center;
    margin-bottom: var(--space-xl);
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
  }

  .breadcrumb a:hover {
    color: var(--color-on-navy);
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-base);
    color: var(--color-primary-text);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.13em;
    line-height: 1.4;
    text-transform: uppercase;
  }

  .eyebrow::before {
    width: 28px;
    height: 2px;
    background: currentColor;
    content: "";
  }

  .hero .eyebrow,
  .section-dark .eyebrow,
  .section-data .eyebrow,
  .final-cta .eyebrow {
    color: var(--color-primary-text-on-dark);
  }

  .hero h1 {
    max-width: 760px;
    font-size: clamp(3.2rem, 6.3vw, 6rem);
    font-weight: 800;
    letter-spacing: -0.055em;
    line-height: 0.94;
  }

  .hero-lede {
    max-width: 720px;
    margin-top: var(--space-lg);
    color: rgba(255, 255, 255, 0.86);
    font-size: clamp(1.08rem, 1.7vw, 1.28rem);
    line-height: 1.55;
  }

  .hero-note {
    max-width: 690px;
    margin-top: var(--space-lg);
    padding-left: var(--space-base);
    border-left: 2px solid var(--color-primary);
    color: rgba(255, 255, 255, 0.67);
    font-size: 14px;
    line-height: 1.55;
  }

  .hero-moat {
    max-width: 720px;
    padding: var(--space-base) var(--space-lg);
    border: 1px solid rgba(242, 107, 33, 0.3);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    background: linear-gradient(90deg, rgba(242, 107, 33, 0.12), rgba(255, 255, 255, 0.035));
    color: rgba(255, 255, 255, 0.82);
    font-size: 15px;
  }

  .hero-moat strong {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-primary-text-on-dark);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
  }

  .signal-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
    list-style: none;
  }

  .signal-chips li {
    display: inline-flex;
    min-height: 34px;
    align-items: center;
    gap: var(--space-sm);
    padding: 6px var(--space-md);
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-md);
    background: var(--color-white-soft);
    color: rgba(255, 255, 255, 0.8);
    font-size: 12px;
    font-weight: 700;
  }

  .signal-chips .icon {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
  }

  .signal-console {
    animation: console-enter 700ms var(--ease-decelerate) both;
    animation-delay: 180ms;
  }

  .signal-console picture {
    display: block;
    overflow: hidden;
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    background: var(--color-navy-raised);
    box-shadow: var(--shadow-3);
  }

  .signal-console img,
  .diagram-frame img {
    width: 100%;
  }

  .signal-console figcaption {
    margin-top: var(--space-md);
    padding-right: 96px;
    color: rgba(255, 255, 255, 0.58);
    font-size: 12px;
    text-align: right;
  }

  .section-heading h2,
  .data-copy h2,
  .operator-copy h2,
  .source-grid h2,
  .final-cta h2 {
    max-width: 790px;
    font-size: clamp(2.25rem, 4.6vw, 4.65rem);
    font-weight: 800;
    letter-spacing: -0.045em;
    line-height: 1;
  }

  .section-heading > p:not(.eyebrow),
  .data-copy > p:not(.eyebrow),
  .operator-copy > p:not(.eyebrow),
  .source-grid > div > p:not(.eyebrow) {
    max-width: 720px;
    margin-top: var(--space-lg);
    color: var(--color-on-surface-secondary);
  }

  .section-dark .section-heading > p:not(.eyebrow),
  .implementation .section-heading > p:not(.eyebrow) {
    color: var(--color-white-muted);
  }

  .section-heading-wide {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.52fr);
    gap: var(--space-xl) var(--space-3xl);
    align-items: end;
    margin-bottom: var(--space-2xl);
  }

  .section-heading-wide .eyebrow {
    grid-column: 1 / -1;
    margin-bottom: calc(-1 * var(--space-base));
  }

  .section-heading-wide > p:not(.eyebrow) {
    margin-top: 0;
  }

  .lead {
    color: var(--color-on-background);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.5;
  }

  blockquote {
    position: relative;
    margin-block: var(--space-sm);
    padding: var(--space-xl);
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: var(--color-surface-secondary);
    font-size: clamp(1.35rem, 2.5vw, 2rem);
    font-weight: 700;
    letter-spacing: -0.025em;
    line-height: 1.28;
  }

  .fact-band {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-base);
    align-items: start;
    padding: var(--space-lg);
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-1);
    color: var(--color-on-surface-secondary);
    font-size: 14px;
  }

  .fact-band .icon {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
  }

  .fact-band strong {
    color: var(--color-on-background);
  }

  .fact-band-bridge {
    border-color: rgba(36, 87, 214, 0.28);
    border-left: 4px solid var(--color-accent);
    background: linear-gradient(105deg, var(--color-blue-soft), var(--color-surface) 62%);
  }

  .fact-band-bridge .icon {
    color: var(--color-accent-text);
  }

  .fact-band-bridge strong {
    display: block;
    margin-bottom: var(--space-xs);
    color: var(--color-accent-text);
    font-size: 15px;
  }

  .steps {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--space-base);
    list-style: none;
  }

  .step-card {
    position: relative;
    display: grid;
    min-height: 270px;
    grid-column: span 4;
    align-content: space-between;
    gap: var(--space-xl);
    padding: var(--space-xl);
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-md);
    background: rgba(16, 34, 53, 0.86);
    box-shadow: inset 0 1px rgba(255, 255, 255, 0.05);
  }

  .step-card:nth-child(4) {
    grid-column: 3 / span 4;
  }

  .step-number {
    color: var(--color-primary-text-on-dark);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.12em;
  }

  .step-card h3 {
    margin-bottom: var(--space-md);
    color: var(--color-on-navy);
    font-size: 20px;
    line-height: 1.25;
  }

  .step-card p {
    color: var(--color-white-muted);
    font-size: 14px;
    line-height: 1.58;
  }

  .diagram-summary {
    margin-top: var(--space-xl);
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-md);
    background: var(--color-white-soft);
    color: var(--color-white-muted);
  }

  .diagram-summary summary {
    min-height: 48px;
    padding: 12px var(--space-base);
    color: var(--color-on-navy);
    font-size: 14px;
    font-weight: 700;
  }

  .diagram-summary p {
    padding: 0 var(--space-base) var(--space-base);
    font-size: 14px;
  }

  .diagram-summary-light {
    border-color: var(--color-outline);
    background: var(--color-surface);
    color: var(--color-on-surface-secondary);
  }

  .diagram-summary-light summary {
    color: var(--color-on-background);
  }

  .comparison-layout .section-heading {
    align-self: start;
    padding-top: var(--space-2xl);
  }

  .comparison-layout .section-heading strong {
    color: var(--color-on-background);
  }

  .diagram-frame {
    overflow: hidden;
    border-radius: var(--radius-lg);
    background: var(--color-navy);
    box-shadow: var(--shadow-2);
  }

  .diagram-frame-offset {
    transform: translateY(-36px);
  }

  .diagram-frame figcaption {
    padding: var(--space-base) var(--space-lg) var(--space-lg);
    color: rgba(255, 255, 255, 0.65);
    font-size: 13px;
  }

  .check-list {
    display: grid;
    gap: var(--space-base);
    margin-top: var(--space-xl);
    list-style: none;
  }

  .check-list li {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-md);
    align-items: start;
    color: var(--color-on-surface-secondary);
  }

  .check-list .icon {
    margin-top: 4px;
    color: var(--color-success);
  }

  .check-list strong {
    color: var(--color-on-background);
  }

  .warning-note {
    margin-top: var(--space-xl);
    padding: var(--space-base);
    border-left: 3px solid var(--color-primary);
    background: var(--color-orange-soft);
    color: var(--color-on-surface-secondary);
    font-size: 14px;
  }

  .warning-note strong {
    color: var(--color-on-background);
  }

  .criteria-panel {
    overflow: hidden;
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-1);
  }

  .criteria-intro,
  .criteria-close {
    padding: var(--space-lg) var(--space-xl);
    color: var(--color-on-surface-secondary);
  }

  .criteria-intro {
    border-bottom: 1px solid var(--color-outline);
    color: var(--color-on-background);
    font-weight: 700;
  }

  .criteria-close {
    border-top: 1px solid var(--color-outline);
    background: var(--color-surface-secondary);
    font-size: 14px;
  }

  .criteria-list {
    list-style: none;
  }

  .criteria-list li {
    display: grid;
    min-height: 72px;
    grid-template-columns: 64px 1fr;
    align-items: center;
    border-bottom: 1px solid var(--color-outline);
  }

  .criteria-list li:last-child {
    border-bottom: 0;
  }

  .criteria-list span {
    display: grid;
    align-self: stretch;
    place-items: center;
    border-right: 1px solid var(--color-outline);
    color: var(--color-primary-text);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
  }

  .criteria-list p {
    padding: var(--space-base) var(--space-lg);
  }

  .section-data {
    overflow: hidden;
    background: var(--color-navy);
    color: var(--color-on-navy);
  }

  .section-data::after {
    position: absolute;
    top: 10%;
    right: -150px;
    width: 500px;
    height: 500px;
    border: 1px solid rgba(242, 107, 33, 0.24);
    border-radius: 50%;
    content: "";
  }

  .section-data .data-grid {
    position: relative;
    z-index: 1;
  }

  .section-data .data-copy > p:not(.eyebrow) {
    color: var(--color-white-muted);
  }

  .data-list {
    display: grid;
    gap: 1px;
    margin-top: var(--space-xl);
    overflow: hidden;
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-md);
    background: var(--color-white-line);
  }

  .data-list > div {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: var(--space-base);
    padding: var(--space-base);
    background: rgba(16, 34, 53, 0.94);
  }

  .data-list dt {
    color: var(--color-primary-text-on-dark);
    font-size: 13px;
    font-weight: 800;
  }

  .data-list dd {
    color: var(--color-white-muted);
    font-size: 14px;
  }

  .record-card {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    color: var(--color-on-background);
    box-shadow: 16px 18px 0 rgba(242, 107, 33, 0.18), var(--shadow-3);
    transform: rotate(1.25deg);
  }

  .record-card::before {
    display: block;
    height: 4px;
    background: var(--color-primary);
    content: "";
  }

  .record-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-base);
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-outline);
  }

  .record-kicker {
    color: var(--color-on-surface-secondary);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
  }

  .record-header h3 {
    margin-top: var(--space-xs);
    font-family: var(--font-mono);
    font-size: 22px;
  }

  .status-pill {
    display: inline-flex;
    min-height: 32px;
    align-items: center;
    gap: var(--space-xs);
    padding: 5px 10px;
    border-radius: var(--radius-full);
    background: var(--color-green-soft);
    color: var(--color-success-text);
    font-size: 12px;
    font-weight: 800;
  }

  .status-pill .icon {
    width: 15px;
    height: 15px;
  }

  .record-fields {
    padding: 0 var(--space-lg);
  }

  .record-fields > div {
    display: grid;
    grid-template-columns: minmax(110px, 0.55fr) minmax(0, 1fr);
    gap: var(--space-base);
    padding-block: var(--space-md);
    border-bottom: 1px solid var(--color-outline);
  }

  .record-fields > div:last-child {
    border-bottom: 0;
  }

  .record-fields dt {
    color: var(--color-on-surface-secondary);
    font-size: 13px;
  }

  .record-fields dd {
    font-size: 14px;
    font-weight: 700;
    overflow-wrap: anywhere;
  }

  .record-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--color-outline);
    background: var(--color-surface-secondary);
    color: var(--color-on-surface-secondary);
    font-size: 11px;
  }

  .fit-card {
    overflow: hidden;
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-1);
  }

  .fit-card-head {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--color-outline);
  }

  .fit-card-head .icon {
    width: 26px;
    height: 26px;
  }

  .fit-card-positive .fit-card-head {
    background: var(--color-green-soft);
    color: var(--color-success-text);
  }

  .fit-card-negative .fit-card-head {
    background: var(--color-orange-soft);
    color: var(--color-warning);
  }

  .fit-card h3 {
    color: var(--color-on-background);
    font-size: 21px;
  }

  .fit-card ul {
    list-style: none;
  }

  .fit-card li {
    position: relative;
    min-height: 56px;
    padding: 14px var(--space-xl) 14px 52px;
    border-bottom: 1px solid var(--color-outline);
    color: var(--color-on-surface-secondary);
    font-size: 15px;
  }

  .fit-card li:last-child {
    border-bottom: 0;
  }

  .fit-card li::before {
    position: absolute;
    top: 23px;
    left: 30px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-primary);
    content: "";
  }

  .fit-card-positive li::before {
    background: var(--color-success);
  }

  .implementation-list {
    display: grid;
    gap: 1px;
    overflow: hidden;
    border: 1px solid var(--color-white-line);
    border-radius: var(--radius-lg);
    background: var(--color-white-line);
    list-style: none;
  }

  .implementation-list li {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: rgba(16, 34, 53, 0.96);
  }

  .implementation-list li > span {
    color: var(--color-primary-text-on-dark);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
  }

  .implementation-list h3 {
    margin-bottom: var(--space-xs);
    font-size: 18px;
    line-height: 1.3;
  }

  .implementation-list p {
    color: var(--color-white-muted);
    font-size: 14px;
  }

  .portrait-frame {
    position: relative;
    max-width: 430px;
    margin-left: auto;
  }

  .portrait-frame::before {
    position: absolute;
    top: -18px;
    right: -18px;
    bottom: 18px;
    left: 18px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    content: "";
  }

  .portrait-frame img {
    position: relative;
    width: 100%;
    aspect-ratio: 3 / 4;
    border-radius: var(--radius-md);
    object-fit: cover;
    object-position: center 26%;
    filter: saturate(0.78) contrast(1.04);
  }

  .operator-copy {
    max-width: 680px;
  }

  .operator-quote {
    margin-top: var(--space-lg);
    color: var(--color-on-background);
    font-size: clamp(1.5rem, 2.8vw, 2.35rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.25;
  }

  .operator-copy > p:last-of-type {
    margin-top: var(--space-lg);
    color: var(--color-on-surface-secondary);
  }

  .text-link {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-accent-text);
    font-weight: 800;
    text-decoration: none;
  }

  .text-link:hover {
    text-decoration: underline;
  }

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

  .faq-list {
    overflow: hidden;
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-1);
  }

  .faq-list details {
    border-bottom: 1px solid var(--color-outline);
  }

  .faq-list details:last-child {
    border-bottom: 0;
  }

  .faq-list summary {
    position: relative;
    min-height: 64px;
    padding: 19px 58px 19px var(--space-lg);
    color: var(--color-on-background);
    font-size: 16px;
    font-weight: 700;
    line-height: 1.5;
    list-style: none;
    transition: background-color var(--duration-fast) var(--ease-standard);
  }

  .faq-list summary::-webkit-details-marker {
    display: none;
  }

  .faq-list summary::before,
  .faq-list summary::after {
    position: absolute;
    top: 31px;
    right: var(--space-lg);
    width: 16px;
    height: 2px;
    background: var(--color-primary);
    content: "";
    transition: transform var(--duration-normal) var(--ease-standard);
  }

  .faq-list summary::after {
    transform: rotate(90deg);
  }

  .faq-list details[open] summary::after {
    transform: rotate(0);
  }

  .faq-list summary:hover {
    background: var(--color-surface-secondary);
  }

  .faq-list details[open] summary {
    color: var(--color-primary-text);
  }

  .faq-list details p {
    max-width: 780px;
    padding: 0 58px var(--space-lg) var(--space-lg);
    color: var(--color-on-surface-secondary);
    font-size: 15px;
  }

  .source-section {
    border-top: 1px solid var(--color-outline);
  }

  .source-grid h2 {
    font-size: clamp(2rem, 3.4vw, 3.35rem);
  }

  .source-links {
    overflow: hidden;
    border: 1px solid var(--color-outline);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    list-style: none;
  }

  .source-links li {
    border-bottom: 1px solid var(--color-outline);
  }

  .source-links li:last-child {
    border-bottom: 0;
  }

  .source-links a {
    display: flex;
    min-height: 56px;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-base);
    padding: var(--space-md) var(--space-base);
    color: var(--color-on-background);
    font-size: 14px;
    font-weight: 700;
    text-decoration: none;
    transition: background-color var(--duration-fast) var(--ease-standard), color var(--duration-fast) var(--ease-standard);
  }

  .source-links a:hover {
    background: var(--color-surface-secondary);
    color: var(--color-accent-text);
  }

  .source-links a:active {
    background: var(--color-blue-soft);
  }

  .source-links .icon {
    width: 17px;
    height: 17px;
  }

  .final-cta {
    overflow: hidden;
    background: var(--color-navy);
    color: var(--color-on-navy);
  }

  .final-cta::before {
    position: absolute;
    top: -180px;
    left: -180px;
    width: 420px;
    height: 420px;
    border: 80px solid rgba(242, 107, 33, 0.08);
    border-radius: 50%;
    content: "";
  }

  .final-cta-grid {
    position: relative;
  }

  .final-cta-copy > p {
    color: var(--color-white-muted);
  }

  .final-cta .button-outline {
    color: var(--color-on-navy);
  }

  .cta-note {
    margin-top: var(--space-lg);
    color: rgba(255, 255, 255, 0.55) !important;
    font-size: 13px;
  }

  .site-footer {
    padding-block: var(--space-2xl);
    border-top: 1px solid var(--color-white-line);
    background: var(--color-navy);
    color: var(--color-white-muted);
  }

  .site-footer .brand {
    display: inline-flex;
    margin-bottom: var(--space-md);
  }

  .site-footer p {
    font-size: 13px;
  }

  .footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-lg);
    justify-content: flex-end;
  }

  .footer-links a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    color: var(--color-on-navy);
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
  }

  .footer-links a:hover {
    color: var(--color-primary-text-on-dark);
  }

  .footer-fineprint {
    grid-column: 1 / -1;
    max-width: 860px;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-white-line);
    color: rgba(255, 255, 255, 0.52);
  }

  @keyframes console-enter {
    from {
      opacity: 0;
      transform: translate3d(36px, 0, 0);
    }
    to {
      opacity: 1;
      transform: translate3d(0, 0, 0);
    }
}

.mono {
    font-family: var(--font-mono);
  }

  .success-text {
    color: var(--color-success-text);
}

[data-theme="light"] {
    color-scheme: light;
  }

  :is([data-theme="dark"], .dark) {
    --color-background: #0b1118;
    --color-on-background: #f4f7f9;
    --color-surface: #111b25;
    --color-surface-secondary: #0f1821;
    --color-surface-tertiary: #172532;
    --color-surface-elevated: #172532;
    --color-on-surface-secondary: #b2bfca;
    --color-primary-text: #ff9a62;
    --color-accent-text: #8eabff;
    --color-success-text: #69dfa9;
    --color-outline: #2d3d4b;
    --color-outline-strong: #657585;
    --color-focus: #78a0ff;
    --color-orange-soft: rgba(242, 107, 33, 0.18);
    --color-blue-soft: rgba(91, 132, 235, 0.16);
    --color-green-soft: rgba(37, 176, 116, 0.16);
    --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.22);
    --shadow-2: 0 10px 30px rgba(0, 0, 0, 0.32);
    --shadow-3: 0 24px 70px rgba(0, 0, 0, 0.42);
    color-scheme: dark;
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
      --color-background: #0b1118;
      --color-on-background: #f4f7f9;
      --color-surface: #111b25;
      --color-surface-secondary: #0f1821;
      --color-surface-tertiary: #172532;
      --color-surface-elevated: #172532;
      --color-on-surface-secondary: #b2bfca;
      --color-primary-text: #ff9a62;
      --color-accent-text: #8eabff;
      --color-success-text: #69dfa9;
      --color-outline: #2d3d4b;
      --color-outline-strong: #657585;
      --color-focus: #78a0ff;
      --color-orange-soft: rgba(242, 107, 33, 0.18);
      --color-blue-soft: rgba(91, 132, 235, 0.16);
      --color-green-soft: rgba(37, 176, 116, 0.16);
      --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.22);
      --shadow-2: 0 10px 30px rgba(0, 0, 0, 0.32);
      --shadow-3: 0 24px 70px rgba(0, 0, 0, 0.42);
      color-scheme: dark;
    }

    :root:not([data-theme]) .portrait-frame img {
      filter: saturate(0.72) contrast(1.08) brightness(0.92);
    }

    :root:not([data-theme]) .record-card {
      border-color: var(--color-outline);
    }
  }

  :is([data-theme="dark"], .dark) .theme-icon-moon {
    display: none;
  }

  :is([data-theme="dark"], .dark) .theme-icon-sun {
    display: block;
  }

  :is([data-theme="dark"], .dark) .portrait-frame img {
    filter: saturate(0.72) contrast(1.08) brightness(0.92);
  }

  :is([data-theme="dark"], .dark) .record-card {
    border-color: var(--color-outline);
  }

  @media (max-width: 1080px) {
    .desktop-nav,
    .header-cta {
      display: none;
    }

    .mobile-nav {
      display: grid;
    }

    /* The responsive layer appears after components in the cascade. Repeat
       the enhanced hidden state here so a closed JavaScript menu cannot be
       reopened by the mobile display rule. */
    .js .mobile-nav[hidden] {
      display: none;
    }

    .js .menu-toggle {
      display: inline-grid;
    }

    .hero-grid {
      grid-template-columns: minmax(0, 0.9fr) minmax(390px, 1.1fr);
      gap: var(--space-xl);
    }

    .hero h1 {
      font-size: clamp(3rem, 7vw, 5.2rem);
    }

    .steps {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .step-card,
    .step-card:nth-child(4) {
      grid-column: auto;
    }

    .step-card:last-child {
      grid-column: 1 / -1;
      min-height: 220px;
    }
  }

  @media (max-width: 900px) {
    :root {
      --space-4xl: 80px;
    }

    .hero {
      padding-block: 72px;
    }

    .hero-grid,
    .intro-grid,
    .qualify-grid,
    .faq-layout,
    .implementation-grid,
    .comparison-layout,
    .lifecycle-layout,
    .operator-grid,
    .source-grid,
    .final-cta-grid,
    .data-grid {
      grid-template-columns: 1fr;
      gap: var(--space-2xl);
    }

    .hero::after {
      display: none;
    }

    .hero-visual {
      width: 100%;
      margin-right: 0;
    }

    .signal-console picture {
      border-radius: var(--radius-lg);
    }

    .signal-console figcaption {
      padding-right: 0;
      text-align: left;
    }

    .sticky-heading {
      position: static;
    }

    .section-heading-wide {
      grid-template-columns: 1fr;
      gap: var(--space-lg);
    }

    .section-heading-wide .eyebrow {
      margin-bottom: 0;
    }

    .section-heading-wide > p:not(.eyebrow) {
      margin-top: 0;
    }

    .diagram-frame-offset {
      transform: none;
    }

    .lifecycle-layout .section-heading {
      order: -1;
    }

    .portrait-frame {
      max-width: 380px;
      margin-inline: auto;
    }

    .source-links {
      max-width: 720px;
    }

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

    .footer-links {
      justify-content: flex-start;
    }
  }

  @media (max-width: 759px) {
    :root {
      --header-height: 64px;
      --space-4xl: 64px;
    }

    .shell {
      width: min(var(--shell), calc(100% - 32px));
    }

    .header-inner {
      min-height: var(--header-height);
    }

    .hero {
      padding-block: 48px 56px;
    }

    .hero h1 {
      font-size: clamp(2.85rem, 15vw, 4.6rem);
      line-height: 0.97;
    }

    .hero-lede {
      font-size: 1.06rem;
    }

    .breadcrumb {
      margin-bottom: var(--space-lg);
    }

    .section-heading h2,
    .data-copy h2,
    .operator-copy h2,
    .source-grid h2,
    .final-cta h2 {
      font-size: clamp(2.1rem, 11vw, 3.5rem);
    }

    .steps,
    .fit-grid {
      grid-template-columns: 1fr;
    }

    .step-card,
    .step-card:last-child {
      min-height: 0;
      grid-column: auto;
    }

    .step-card {
      grid-template-columns: 44px 1fr;
      align-items: start;
      gap: var(--space-base);
      padding: var(--space-lg);
    }

    .data-list > div,
    .record-fields > div,
    .implementation-list li {
      grid-template-columns: 1fr;
      gap: var(--space-xs);
    }

    .record-card {
      box-shadow: 8px 10px 0 rgba(242, 107, 33, 0.16), var(--shadow-2);
      transform: none;
    }

    .implementation-list li > span {
      margin-bottom: var(--space-sm);
    }

    .criteria-list li {
      grid-template-columns: 52px 1fr;
    }

    .portrait-frame::before {
      top: -10px;
      right: -10px;
      bottom: 10px;
      left: 10px;
    }

    .signal-console picture,
    .diagram-frame {
      border-radius: var(--radius-md);
    }
  }

  @media (max-width: 560px) {
    .button-row {
      align-items: stretch;
      flex-direction: column;
    }

    .button-row .button {
      width: 100%;
    }

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

    .fit-card-head,
    .criteria-intro,
    .criteria-close {
      padding-inline: var(--space-lg);
    }

    .fit-card li {
      padding-right: var(--space-lg);
    }

    .record-header {
      align-items: flex-start;
      flex-direction: column;
    }

    .source-links a {
      align-items: flex-start;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      scroll-behavior: auto !important;
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }

    .button:active,
    .icon-button:active,
    .desktop-nav a:active,
    .mobile-nav a:active {
      transform: none;
    }
  }

  @media print {
    .site-header,
    .button-row,
    .site-footer {
      display: none;
    }

    .hero,
    .section-dark,
    .section-data,
    .final-cta {
      background: #ffffff !important;
      color: #101418 !important;
    }

    .section {
      padding-block: 32px;
      break-inside: avoid;
    }
}