:root {
  color-scheme: dark;
  --page-bg: #07101a;
  --panel-bg: #0b1420;
  --panel-border: #263242;
  --text-main: #e6edf7;
  --text-muted: #a7b4c6;
  --text-soft: #7f8fa5;
  --accent: #d8903c;
  --accent-soft: rgba(216, 144, 60, 0.12);
  --link: #8fbce8;
  --link-hover: #bdd8f2;
  --max-width: 76rem;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--page-bg);
  color: var(--text-main);
}

body {
  line-height: 1.65;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
}

.page-shell {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 0 1.5rem 3.5rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: minmax(44px, 1fr) auto minmax(44px, 1fr);
  align-items: center;
  gap: 1rem;
  margin: 0 -1.5rem 1.5rem;
  padding: 0.95rem 1.5rem 0.85rem;
  border-bottom: 1px solid var(--panel-border);
  background: rgba(7, 16, 26, 0.96);
  backdrop-filter: blur(10px);
  transition:
    padding 180ms ease,
    background-color 180ms ease;
}

.topbar--compact {
  padding-top: 0.45rem;
  padding-bottom: 0.45rem;
  background: rgba(5, 11, 18, 0.98);
}

.nav-toggle {
  grid-column: 1;
  justify-self: start;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #c6d1de;
  cursor: pointer;
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  background: #0f151f;
  color: var(--accent);
}

.nav-toggle__bar {
  position: absolute;
  left: 50%;
  top: 50%;
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.nav-toggle__bar:nth-child(1) {
  transform: translate(-50%, -50%) translateY(-8px);
}

.nav-toggle__bar:nth-child(3) {
  transform: translate(-50%, -50%) translateY(8px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translate(-50%, -50%) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.brand-lockup {
  grid-column: 2;
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  width: max-content;
  color: var(--text-main);
}

.brand-lockup:hover {
  color: var(--text-main);
}

.brand-lockup__mark {
  width: 2.4rem;
  height: 2.4rem;
  flex: 0 0 auto;
  transition:
    width 180ms ease,
    height 180ms ease;
}

.brand-lockup__text {
  display: grid;
  gap: 0.08rem;
}

.brand-lockup__eyebrow {
  color: var(--accent);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition:
    max-height 160ms ease,
    opacity 160ms ease,
    transform 160ms ease;
}

.brand-lockup__title {
  color: var(--text-main);
  font-size: clamp(1.15rem, 1.8vw, 1.65rem);
  line-height: 1.1;
  transition: font-size 180ms ease;
}

.topbar--compact .brand-lockup {
  gap: 0.5rem;
}

.topbar--compact .brand-lockup__mark {
  width: 1.75rem;
  height: 1.75rem;
}

.topbar--compact .brand-lockup__eyebrow {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-4px);
}

.topbar--compact .brand-lockup__title {
  font-size: 1rem;
}

.nav-links {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.seo-header-ready .nav-links {
  position: absolute;
  top: calc(100% + 0.45rem);
  left: 1.5rem;
  z-index: 70;
  display: grid;
  width: min(17rem, calc(100vw - 2rem));
  padding: 0.5rem;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: #07101a;
  box-shadow: none;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-4px);
  visibility: hidden;
  transition:
    opacity 150ms ease,
    transform 150ms ease,
    visibility 150ms ease;
}

.seo-header-ready .topbar--menu-open .nav-links {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
  visibility: visible;
}

.nav-links a,
.hero-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.25rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  background: var(--panel-bg);
  color: var(--text-main);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.seo-header-ready .nav-links a {
  justify-content: flex-start;
  min-height: 2.2rem;
  padding: 0 0.75rem;
  border: 0;
  background: transparent;
  color: var(--text-muted);
}

.nav-links a.active,
.hero-actions a.primary {
  border-color: rgba(241, 164, 58, 0.5);
  background: var(--accent-soft);
  color: var(--accent);
}

.seo-header-ready .nav-links a.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.hero {
  padding: 1.25rem 0 0.5rem;
}

.eyebrow {
  display: block;
  margin-bottom: 0.75rem;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 3.35rem);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero p {
  max-width: 48rem;
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.5rem;
}

.hero-actions a.secondary {
  color: var(--text-main);
}

.hero-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.panel {
  padding: 1.25rem;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: var(--panel-bg);
  box-shadow: none;
}

.hero-grid .panel strong,
.stats strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-main);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-grid .panel p,
.stats p {
  margin: 0;
  color: var(--text-muted);
}

.content-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.content-grid h2 {
  margin: 0 0 0.9rem;
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: 0;
}

.content-grid h3 {
  margin: 1.1rem 0 0.4rem;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.content-grid p {
  margin: 0.6rem 0 0;
  color: var(--text-muted);
}

.screenshot-figure {
  margin: 1.35rem 0;
}

.screenshot-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(54, 72, 98, 0.86);
  border-radius: 8px;
  background: #050b12;
}

.screenshot-figure figcaption {
  margin-top: 0.55rem;
  color: var(--text-soft);
  font-size: 0.86rem;
  line-height: 1.45;
}

.diagram-figure {
  margin: 1.5rem 0;
}

.diagram-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(54, 72, 98, 0.86);
  border-radius: 8px;
  background: #07101a;
}

.diagram-figure figcaption {
  margin-top: 0.55rem;
  color: var(--text-soft);
  font-size: 0.86rem;
  line-height: 1.45;
}

.content-grid ul,
.content-grid ol {
  margin: 0.9rem 0 0;
  padding-left: 1.3rem;
  color: var(--text-muted);
}

.content-grid li + li {
  margin-top: 0.55rem;
}

.formula {
  display: block;
  margin-top: 1rem;
  padding: 0.95rem 1rem;
  border: 1px solid rgba(134, 151, 183, 0.24);
  border-radius: 6px;
  background: rgba(6, 13, 25, 0.7);
  color: #dce7fb;
  font-family: "SFMono-Regular", SFMono-Regular, Consolas, "Liberation Mono",
    Menlo, monospace;
  font-size: 0.95rem;
  overflow-x: auto;
}

.stats {
  display: grid;
  gap: 1rem;
}

.section-links {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.1rem;
}

.section-links a {
  display: block;
  padding: 1rem 1.1rem;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  background: #09111c;
}

.section-links a span {
  display: block;
  color: var(--text-soft);
  font-size: 0.88rem;
  margin-top: 0.25rem;
}

.footer-note {
  margin-top: 2rem;
  color: var(--text-soft);
  font-size: 0.92rem;
}

@media (min-width: 800px) {
  .hero-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .content-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(19rem, 0.9fr);
    align-items: start;
  }

  .stats {
    position: sticky;
    top: 1.5rem;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .topbar {
    grid-template-columns: minmax(40px, 1fr) auto minmax(40px, 1fr);
    margin-right: -1rem;
    margin-left: -1rem;
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
  }

  .brand-lockup__mark {
    width: 2rem;
    height: 2rem;
  }

  .brand-lockup__eyebrow {
    font-size: 0.58rem;
    letter-spacing: 0.14em;
  }

  .brand-lockup__title {
    font-size: 1.15rem;
  }

  .seo-header-ready .nav-links {
    left: 1rem;
  }
}