:root {
  --color-primary: #0B1F3A;
  --color-accent: #FF6B2C;
  --color-silver: #C0C8D0;
  --color-teal: #00D4AA;
  --color-deep-navy: #041226;
  --color-light-steel: #EAF0F6;
  --color-white: #FFFFFF;
  --color-charcoal: #1A1E24;
  --color-mid-gray: #6B7280;

  --font-display: "DIN Alternate", "Bahnschrift", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "Consolas", "Liberation Mono", monospace;

  --container: 1240px;
  --header-height: 76px;
  --spacing-1: .25rem;
  --spacing-2: .5rem;
  --spacing-3: .75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.5rem;
  --spacing-6: 2rem;
  --spacing-7: 3rem;
  --spacing-8: 4rem;
  --spacing-9: 6rem;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-white);
  color: var(--color-charcoal);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  color: var(--color-charcoal);
}

p {
  margin: 0 0 1rem;
}

p:last-child {
  margin-bottom: 0;
}

address {
  margin: 0;
  font-style: normal;
}

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

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

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

button {
  font: inherit;
  cursor: pointer;
}

main {
  display: block;
}

#main-content:focus {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-deep-navy);
}

ul[class], ol[class] {
  margin: 0;
  padding: 0;
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1rem, 4vw, 2rem);
  padding-right: clamp(1rem, 4vw, 2rem);
}

.section {
  padding: clamp(3rem, 8vw, 5.5rem) 0;
}

.section--tint {
  background: var(--color-light-steel);
}

.section--dark {
  background: var(--color-deep-navy);
  color: var(--color-silver);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4,
.section--dark .section__title,
.section--dark .chapter-head__title {
  color: #FFFFFF;
}

.section__head {
  margin-bottom: var(--spacing-7);
}

.section__eyebrow {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .75rem;
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .14em;
}

.section__eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.section__lede {
  max-width: 640px;
  color: var(--color-mid-gray);
}

.grid {
  display: grid;
  gap: var(--spacing-5);
  grid-template-columns: 1fr;
  min-width: 0;
}

@media (min-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: .25rem 1.25rem;
  border-bottom: 1px solid var(--color-silver);
  padding-bottom: .75rem;
  margin-bottom: var(--spacing-6);
}

.chapter-head__index {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: .9;
  letter-spacing: -.02em;
}

.chapter-head__title {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

.data-card {
  position: relative;
  min-width: 0;
  background: var(--color-white);
  border: 1px solid var(--color-silver);
  padding: 1.5rem;
}

.data-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3rem;
  height: 3px;
  background: var(--color-accent);
}

.data-card__index {
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--color-mid-gray);
}

.data-card__title {
  margin-top: .5rem;
  font-size: 1.25rem;
  font-weight: 900;
}

.data-card__value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .2rem .6rem;
  border: 1px solid var(--color-silver);
  background: var(--color-light-steel);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  white-space: nowrap;
}

.tag--accent {
  border-color: var(--color-accent);
  background: rgba(255, 107, 44, .08);
  color: var(--color-accent);
}

.tag--teal {
  border-color: var(--color-teal);
  background: rgba(0, 212, 170, .08);
  color: #007A66;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-weight: 700;
  text-align: center;
  transition: background .25s ease, color .25s ease, border-color .25s ease, transform .25s ease;
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

.btn--primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-deep-navy);
  transform: translateY(-2px);
}

.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-deep-navy);
}

.btn--accent:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-silver);
  color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-light-steel);
  border-color: var(--color-primary);
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--color-silver);
  background: linear-gradient(135deg, var(--color-light-steel), var(--color-silver));
}

.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame[data-media-label]::after {
  content: attr(data-media-label);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: .5rem .75rem;
  border-top: 1px solid var(--color-silver);
  background: rgba(255, 255, 255, .8);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: .75rem;
}

.breadcrumb {
  padding: 1rem 0;
  font-size: .875rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  color: var(--color-mid-gray);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin: 0 .5rem;
  color: var(--color-silver);
}

.breadcrumb__item a:hover {
  color: var(--color-accent);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 700;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 2000;
  padding: .75rem 1.25rem;
  background: var(--color-primary);
  color: #FFFFFF;
  font-weight: 700;
  transition: top .2s ease;
}

.skip-link:hover {
  background: var(--color-accent);
  color: var(--color-deep-navy);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
}

.site-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 30;
  pointer-events: none;
  background: rgba(11, 31, 58, .08);
}

.site-progress__inner {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-teal));
}

.masthead {
  position: relative;
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid var(--color-silver);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
}

.masthead__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
}

.brand__mark {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  width: 28px;
  height: 28px;
}

.brand__mark::before {
  content: "";
  background: var(--color-primary);
  clip-path: polygon(0 100%, 100% 0, 100% 42%, 0 100%);
}

.brand__mark::after {
  content: "";
  background: var(--color-accent);
  clip-path: polygon(0 100%, 42% 0, 100% 0, 0 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: .04em;
  transition: color .3s ease;
}

.brand__sub {
  color: var(--color-mid-gray);
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  transition: color .3s ease;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .75rem;
  border: 1px solid var(--color-silver);
  border-radius: 0;
  background: var(--color-white);
  color: var(--color-primary);
  font-size: .875rem;
  font-weight: 700;
  line-height: 1;
  transition: color .3s ease, border-color .3s ease, background .3s ease;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: background .2s ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .25s ease, top .25s ease;
}

.nav-toggle__bars::before {
  top: -7px;
}

.nav-toggle__bars::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list__item {
  margin: 0;
}

.nav-list__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: .625rem .875rem;
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .02em;
  transition: color .25s ease;
}

.nav-list__link::after {
  content: "";
  position: absolute;
  left: .875rem;
  right: .875rem;
  bottom: .125rem;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}

.nav-list__link:hover {
  color: var(--color-accent);
}

.nav-list__link:hover::after {
  transform: scaleX(1);
}

.nav-list__link[aria-current="page"] {
  color: var(--color-accent);
}

.nav-list__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.masthead-meta {
  height: 38px;
  overflow: hidden;
  background: var(--color-deep-navy);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  transition: height .3s ease, opacity .3s ease, border-color .3s ease;
}

.masthead-meta__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  color: var(--color-silver);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
}

.masthead-meta__version {
  white-space: nowrap;
}

.masthead-meta__status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-weight: 700;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-teal);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, .16);
  animation: statusPulse 2.4s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(0, 212, 170, .16);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(0, 212, 170, .04);
  }
}

.site-header[data-scrolled="true"] .masthead {
  background: rgba(4, 18, 38, .92);
  border-bottom-color: rgba(255, 255, 255, .12);
  box-shadow: 0 8px 32px rgba(4, 18, 38, .28);
}

.site-header[data-scrolled="true"] .brand__name {
  color: #FFFFFF;
}

.site-header[data-scrolled="true"] .brand__sub {
  color: var(--color-silver);
}

.site-header[data-scrolled="true"] .brand__mark::before {
  background: #FFFFFF;
}

.site-header[data-scrolled="true"] .nav-list__link {
  color: rgba(255, 255, 255, .9);
}

.site-header[data-scrolled="true"] .nav-list__link:hover {
  color: #FFFFFF;
}

.site-header[data-scrolled="true"] .nav-list__link[aria-current="page"] {
  color: var(--color-accent);
}

.site-header[data-scrolled="true"] .nav-toggle {
  background: transparent;
  border-color: rgba(255, 255, 255, .35);
  color: #FFFFFF;
}

.site-header[data-scrolled="true"] .masthead-meta {
  height: 0;
  opacity: 0;
  border-bottom-width: 0;
}

@media (max-width: 991px) {
  .masthead__inner {
    min-height: 64px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    z-index: 40;
    display: block;
    max-height: 0;
    overflow: auto;
    opacity: 0;
    visibility: hidden;
    background: var(--color-deep-navy);
    border-bottom: 1px solid rgba(255, 255, 255, .12);
    transition: max-height .3s ease, opacity .3s ease, visibility .3s ease;
  }

  .site-nav[data-open] {
    max-height: calc(100vh - 64px);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .75rem;
  }

  .nav-list__item + .nav-list__item {
    border-top: 1px solid rgba(255, 255, 255, .08);
  }

  .nav-list__link {
    display: block;
    padding: .9rem 1rem;
    color: rgba(255, 255, 255, .92);
    font-size: 1rem;
  }

  .nav-list__link::after {
    display: none;
  }

  .site-header[data-scrolled="true"] .masthead {
    background: var(--color-deep-navy);
  }
}

.site-footer {
  background: var(--color-deep-navy);
  color: var(--color-silver);
  font-size: .9375rem;
}

.site-footer a {
  color: var(--color-light-steel);
  transition: color .2s ease;
}

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

.footer-main {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding: var(--spacing-8) 0;
}

.footer-brand,
.footer-nav,
.footer-legal {
  min-width: 0;
}

.brand--footer .brand__name {
  color: #FFFFFF;
}

.brand--footer .brand__sub {
  color: var(--color-silver);
}

.brand--footer .brand__mark::before {
  background: #FFFFFF;
}

.footer-trust {
  margin-top: 1.25rem;
  max-width: 36em;
  color: var(--color-silver);
  font-size: .875rem;
  line-height: 1.75;
}

.footer-contact {
  display: grid;
  gap: .25rem;
  margin-top: 1.25rem;
  color: var(--color-light-steel);
  font-family: var(--font-mono);
  font-size: .8125rem;
}

.footer-nav__title {
  display: block;
  margin-bottom: 1rem;
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: .06em;
}

.footer-list {
  display: grid;
  gap: .5rem;
}

.footer-icp {
  margin-top: 1.25rem;
  color: var(--color-mid-gray);
  font-family: var(--font-mono);
  font-size: .75rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding: 1.25rem 0;
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
}

.footer-bottom p {
  margin: 0;
  color: var(--color-mid-gray);
  font-size: .8125rem;
}

@media (max-width: 991px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: var(--spacing-7) 0;
  }

  .footer-bottom__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0s !important;
  }

  .status-dot {
    animation: none;
  }
}