:root {
  color-scheme: dark;
  --deep-blue: #0D1526;
  --navy-blue: #16203A;
  --electric-blue: #00B4FF;
  --red: #FF3B3B;
  --orange: #FF8A00;
  --text-primary: #F0F4FF;
  --text-secondary: #A0AABF;
  --border: #2A3A5E;
  --header-w: 280px;
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 85% 0%, rgba(0, 180, 255, .10), transparent 34rem),
    var(--deep-blue);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

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

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

button {
  font: inherit;
}

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

::selection {
  background: var(--electric-blue);
  color: var(--deep-blue);
}

:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 12px 20px;
  background: var(--electric-blue);
  color: var(--deep-blue);
  font-weight: 800;
  border-radius: 2px;
  transition: top .2s ease;
}

.skip-link:focus {
  top: 16px;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 3px;
  z-index: 2000;
  background: linear-gradient(90deg, var(--electric-blue), var(--orange));
  transform: scaleX(0);
  transform-origin: 0 0;
  pointer-events: none;
  transition: transform 120ms linear;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--header-w);
  height: 100vh;
  background: var(--navy-blue);
  border-right: 1px solid var(--border);
  z-index: 1000;
}

.header__rail {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: clamp(20px, 3vh, 32px) 20px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.brand__sigil {
  position: relative;
  width: 38px;
  height: 38px;
  flex: none;
  border: 1px solid var(--electric-blue);
  border-radius: 2px;
  transform: rotate(45deg);
}

.brand__sigil::before {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid var(--orange);
  transform: rotate(45deg);
}

.brand__name {
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: .06em;
  color: var(--text-primary);
}

.brand__name strong {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .22em;
  color: var(--electric-blue);
}

.brand__label {
  display: block;
  margin-top: 7px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--text-secondary);
  font-family: var(--font-body);
}

.nav-track {
  display: flex;
  flex-direction: column;
  flex: 1;
  margin-top: 36px;
}

.nav-track__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-track__item {
  margin: 0;
}

.nav-track__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 12px;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .04em;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  background: transparent;
  transition: background .25s, color .25s, border-color .25s;
}

.nav-track__index {
  min-width: 22px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--electric-blue);
  opacity: .55;
}

.nav-track__link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, .04);
  border-left-color: var(--electric-blue);
}

.nav-track__link[aria-current="page"] {
  color: var(--text-primary);
  background: linear-gradient(90deg, rgba(0, 180, 255, .18), rgba(0, 180, 255, 0));
  border-left-color: var(--electric-blue);
}

.nav-track__link[aria-current="page"] .nav-track__index {
  opacity: 1;
}

.nav-track__foot {
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.nav-track__cta {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: linear-gradient(135deg, rgba(255, 138, 0, .18), rgba(0, 180, 255, .08));
  border: 1px solid rgba(255, 138, 0, .45);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 700;
  transition: border-color .25s, transform .25s, box-shadow .25s;
}

.nav-track__cta:hover {
  border-color: var(--orange);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(2, 8, 20, .4);
}

.nav-track__cta-mark {
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--orange);
  transform: rotate(45deg);
  box-shadow: 0 0 10px rgba(255, 138, 0, .9);
}

.header__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 20px;
  font-size: 12px;
  color: var(--text-secondary);
}

.header__meta-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--electric-blue);
  box-shadow: 0 0 12px var(--electric-blue);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: .55; }
  50% { opacity: 1; }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  margin: 3px 0;
  background: currentColor;
  transition: transform .25s var(--ease);
}

.nav-toggle__label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--text-secondary);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar--one {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar--two {
  transform: translateY(-4px) rotate(-45deg);
}

.site-footer {
  margin-top: clamp(64px, 10vw, 120px);
  background: var(--navy-blue);
  border-top: 1px solid var(--border);
}

.footer__grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr .7fr .8fr;
  gap: 48px;
  padding: 64px 56px 44px;
}

.footer__identity,
.footer__nav,
.footer__legal {
  display: flex;
  flex-direction: column;
}

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: .06em;
  color: var(--text-primary);
}

.footer__brand-sigil {
  width: 10px;
  height: 10px;
  flex: none;
  background: var(--electric-blue);
  transform: rotate(45deg);
  box-shadow: 0 0 14px var(--electric-blue);
}

.footer__tagline {
  margin: 18px 0 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--electric-blue);
}

.footer__trust {
  margin: 14px 0 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.footer__heading {
  margin: 0 0 16px;
  padding-left: 10px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border-left: 2px solid var(--orange);
}

.footer__list {
  display: grid;
  gap: 10px;
}

.footer__list a {
  display: inline-block;
  font-size: 14px;
  color: var(--text-secondary);
  transition: color .2s, transform .2s;
}

.footer__list a:hover {
  color: var(--electric-blue);
  transform: translateX(4px);
}

.footer__contact {
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 2;
  color: var(--text-secondary);
}

.footer__bottom {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 20px 56px 28px;
  border-top: 1px solid var(--border);
}

.footer__copyright,
.footer__icp {
  margin: 0;
  font-size: 13px;
  color: var(--text-secondary);
}

.container {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(32px, 5vw, 72px) clamp(20px, 5vw, 56px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  cursor: pointer;
  transition: border-color .25s, background .25s, box-shadow .25s, transform .25s;
}

.btn-primary {
  background: var(--electric-blue);
  border-color: var(--electric-blue);
  color: var(--deep-blue);
}

.btn-primary:hover {
  box-shadow: 0 0 0 3px rgba(0, 180, 255, .25);
  transform: translateY(-1px);
}

.btn-outline {
  border-color: rgba(0, 180, 255, .6);
  color: var(--electric-blue);
}

.btn-outline:hover {
  background: rgba(0, 180, 255, .12);
  border-color: var(--electric-blue);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  font-size: 14px;
  color: var(--text-secondary);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumbs__link {
  color: var(--electric-blue);
}

.breadcrumbs__current {
  color: var(--text-primary);
  font-weight: 700;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.section-kicker {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange);
}

.section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 900;
  line-height: 1.05;
}

.grid {
  display: grid;
  gap: 24px;
}

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

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--navy-blue);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 10px 30px rgba(2, 6, 18, .25);
}

.card__body {
  padding: 24px;
}

.card__label {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 8px;
  border: 1px solid rgba(255, 138, 0, .3);
  border-radius: 2px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--orange);
}

.card__title {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.3;
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--navy-blue);
  border: 1px solid var(--border);
  border-radius: 2px;
}

.media-frame::before {
  content: "";
  display: block;
  padding-bottom: 56.25%;
}

.media-frame--portrait::before {
  padding-bottom: 125%;
}

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

.prose {
  max-width: 72ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-secondary);
}

.prose h1,
.prose h2,
.prose h3 {
  color: var(--text-primary);
  font-family: var(--font-display);
  line-height: 1.2;
}

.prose p {
  margin: 1em 0;
}

@media (min-width: 1024px) {
  body {
    padding-left: var(--header-w);
  }

  .reading-progress {
    left: var(--header-w);
    width: calc(100vw - var(--header-w));
  }
}

@media (max-width: 1023.98px) {
  body {
    padding-top: 64px;
  }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    width: auto;
    height: 64px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    background: rgba(13, 21, 38, .94);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
  }

  .header__rail {
    height: 64px;
    flex-direction: row;
    align-items: center;
    padding: 0 16px;
  }

  .brand__name {
    font-size: 18px;
  }

  .brand__name strong {
    font-size: 12px;
  }

  .brand__label {
    display: none;
  }

  .nav-track {
    position: fixed;
    top: 64px;
    right: 0;
    bottom: 0;
    left: auto;
    width: min(82vw, 360px);
    height: auto;
    margin: 0;
    padding: 24px 16px 32px;
    background: rgba(13, 21, 38, .98);
    border-left: 1px solid var(--border);
    border-top: 1px solid var(--border);
    box-shadow: -24px 0 48px rgba(0, 0, 0, .3);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform .35s var(--ease), visibility .35s;
    z-index: 1050;
  }

  .nav-track[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-track__foot {
    margin-top: 40px;
  }

  .header__meta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    position: absolute;
    top: 12px;
    right: 16px;
    z-index: 1060;
  }

  .nav-toggle__label {
    display: none;
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 48px 32px 32px;
  }

  .footer__identity {
    grid-column: 1 / -1;
  }

  .footer__bottom {
    padding: 16px 32px 24px;
  }
}

@media (max-width: 767.98px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .grid--3 {
    gap: 16px;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    padding: 40px 20px 24px;
  }

  .footer__identity {
    grid-column: auto;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 20px 24px;
  }

  .card__body {
    padding: 18px;
  }
}

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

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