:root {
  --bg-deep: #0A0E17;
  --bg-panel: #121828;
  --bg-panel-2: #182034;
  --fg: #F2F5FA;
  --muted: #8A94A6;
  --cyan: #00E5FF;
  --purple: #B388FF;
  --orange: #FF6D00;
  --silver: #C0C4CC;
  --danger: #FF3B3B;
  --track: linear-gradient(90deg, #00E5FF, #B388FF);
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-head: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  --header-h: 3.75rem;
  --container: 1280px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-deep);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body,
h1,
h2,
h3,
h4,
p,
ul,
figure {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.15;
}

ul {
  padding: 0;
}

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

a:hover {
  text-decoration: underline;
  text-decoration-color: var(--purple);
}

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

button {
  font: inherit;
  cursor: pointer;
}

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

::selection {
  background: var(--cyan);
  color: var(--bg-deep);
}

#main-content {
  scroll-margin-top: 5rem;
}

.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -4rem;
  left: 1rem;
  z-index: 200;
  padding: .6rem 1.1rem;
  background: var(--cyan);
  color: var(--bg-deep);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 20px rgba(0, 229, 255, .4);
  transition: top .2s ease;
}

.skip-link:hover {
  color: var(--bg-deep);
  text-decoration: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  min-height: 2.75rem;
  padding: .6rem 1.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  background: var(--bg-panel);
  color: var(--fg);
  font-family: var(--font-head);
  font-size: .875rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 229, 255, .25);
}

.btn-primary {
  background: linear-gradient(120deg, var(--cyan), var(--purple));
  color: var(--bg-deep);
}

.btn-primary:hover {
  box-shadow: 0 0 22px rgba(0, 229, 255, .6);
}

.btn-ghost {
  background: transparent;
  border-color: var(--silver);
  color: var(--fg);
}

.btn-ghost:hover {
  border-color: var(--cyan);
  box-shadow: inset 0 0 20px rgba(0, 229, 255, .15);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
  font-size: .875rem;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--muted);
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--silver);
  opacity: .5;
}

.breadcrumbs a {
  color: var(--muted);
}

.breadcrumbs a:hover {
  color: var(--fg);
}

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

.section-head {
  position: relative;
  margin: 0 0 2rem;
  padding-left: 1rem;
  border-left: 3px solid var(--cyan);
}

.section-head::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -.4rem;
  width: 3.5rem;
  height: 3px;
  background: var(--track);
}

.section-index {
  display: block;
  margin-bottom: .5rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--orange);
  text-transform: uppercase;
}

.section-title {
  margin: .15em 0 .25em;
  font-size: clamp(2rem, 6vw, 4rem);
  letter-spacing: -.02em;
}

.section-desc {
  max-width: 36rem;
  color: var(--muted);
}

.track-line,
.speed-line {
  display: block;
  height: 2px;
  border: 0;
}

.track-line {
  background: var(--track);
}

.speed-line {
  width: min(64rem, 100%);
  margin: 1.5rem 0;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--purple), transparent);
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(0, 229, 255, .08), rgba(179, 136, 255, .06)), var(--bg-panel);
  border: 1px solid rgba(192, 196, 204, .3);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 45%, rgba(0, 229, 255, .18) 50%, transparent 55%);
  opacity: 0;
  transition: opacity .3s;
}

.media-frame:hover::after {
  opacity: 1;
}

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

.media-frame--wide {
  aspect-ratio: 16 / 9;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 23, .92);
  border-bottom: 1px solid rgba(0, 229, 255, .22);
}

.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--purple), transparent);
  opacity: .7;
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  width: min(100% - 2rem, var(--container));
  min-height: var(--header-h);
  margin-inline: auto;
  gap: 1rem;
}

.brand-lockup {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--fg);
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -.02em;
}

.brand-link:hover {
  color: var(--fg);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: block;
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  clip-path: polygon(0 15%, 85% 0, 100% 70%, 30% 100%);
  transform: skewX(-8deg);
}

.brand-mark i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--bg-deep);
}

.brand-mark i:nth-child(1) {
  top: 32%;
}

.brand-mark i:nth-child(2) {
  top: 50%;
}

.brand-mark i:nth-child(3) {
  top: 68%;
}

.brand-text {
  position: relative;
}

.brand-text::after {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  margin-left: 2px;
  vertical-align: middle;
  background: var(--orange);
}

.site-nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: .5rem .55rem;
  color: var(--muted);
  font-size: .88rem;
  font-weight: 500;
  text-decoration: none;
  transition: color .2s;
}

.nav-list a::before {
  content: "";
  position: absolute;
  left: .55rem;
  right: .55rem;
  bottom: .15rem;
  height: 2px;
  background: var(--track);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s var(--ease);
}

.nav-list a:hover {
  color: var(--fg);
  text-decoration: none;
}

.nav-list a:hover::before,
.nav-list a[aria-current="page"]::before {
  transform: scaleX(1);
}

.nav-list a[aria-current="page"] {
  color: var(--fg);
}

.nav-foot {
  display: none;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-left: 1.5rem;
  font-size: .875rem;
  color: var(--muted);
}

.quick-search {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .4rem .85rem;
  border: 1px solid rgba(192, 196, 204, .35);
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  transition: border-color .2s, color .2s, box-shadow .2s;
}

.quick-search:hover {
  border-color: var(--cyan);
  color: var(--fg);
  text-decoration: none;
  box-shadow: 0 0 18px rgba(0, 229, 255, .15);
}

.quick-search-glyph {
  color: var(--cyan);
  font-size: 1.1rem;
  line-height: 1;
}

.quick-search-text {
  font-size: .82rem;
  white-space: nowrap;
}

.quick-search-key {
  padding: 0 .3rem;
  border: 1px solid rgba(192, 196, 204, .35);
  border-radius: 2px;
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: .72rem;
}

.sync-status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .02em;
  text-transform: uppercase;
}

.sync-dot {
  display: block;
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 0 rgba(255, 109, 0, .6);
  animation: pulse 2s infinite;
}

.sync-text {
  color: var(--muted);
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 109, 0, .5);
  }
  70% {
    box-shadow: 0 0 0 .55rem rgba(255, 109, 0, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 109, 0, 0);
  }
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-left: auto;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(0, 229, 255, .35);
  border-radius: 4px;
}

.nav-toggle-line {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: .32rem 0;
  background: var(--cyan);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-of-type(1) {
  transform: translateY(.34rem) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-of-type(3) {
  transform: translateY(-.34rem) rotate(-45deg);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 130;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  box-shadow: 0 0 12px rgba(0, 229, 255, .55);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
  will-change: opacity, transform;
}

[data-reveal].is-inview {
  opacity: 1;
  transform: none;
}

.site-footer {
  position: relative;
  margin-top: 4rem;
  background: linear-gradient(180deg, var(--bg-panel), #0D1420 120%);
  border-top: 1px solid rgba(0, 229, 255, .2);
}

.footer-starline {
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--purple), transparent);
  opacity: .8;
}

.footer-shell {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
  padding: 3.5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2.5rem;
}

.footer-brand .brand-link {
  margin-bottom: 1rem;
}

.footer-about {
  max-width: 20rem;
  color: var(--muted);
}

.footer-trust {
  max-width: 22rem;
  margin-top: .75rem;
  padding-left: .75rem;
  border-left: 2px solid var(--orange);
  color: var(--silver);
  font-size: .875rem;
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  margin: 0 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid rgba(192, 196, 204, .15);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
}

.footer-links li + li {
  margin-top: .4rem;
}

.footer-links a {
  color: var(--muted);
  font-size: .875rem;
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}

.footer-links a:hover {
  color: var(--fg);
  border-bottom-color: var(--cyan);
  text-decoration: none;
}

.footer-contact-line {
  display: flex;
  gap: .4rem;
  margin: .35rem 0;
  color: var(--muted);
  font-size: .875rem;
}

.contact-label {
  display: inline-block;
  min-width: 2.4rem;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.8;
}

.footer-note {
  margin-top: .7rem;
  color: var(--muted);
  font-size: .75rem;
  opacity: .8;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(192, 196, 204, .15);
  color: var(--muted);
  font-size: .8rem;
}

.footer-copyright,
.footer-icp {
  margin: 0;
}

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

@media (max-width: 1120px) {
  .quick-search {
    display: none;
  }

  .header-meta {
    gap: .75rem;
    margin-left: 1rem;
  }
}

@media (max-width: 860px) {
  .header-shell {
    height: auto;
    min-height: var(--header-h);
    flex-wrap: wrap;
    padding: .5rem 0;
  }

  .header-meta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: block;
    position: absolute;
    top: calc(100% + 0px);
    left: 0;
    right: 0;
    margin-left: 0;
    padding: 1rem 1.25rem 1.5rem;
    background: var(--bg-panel);
    border-bottom: 2px solid var(--cyan);
    box-shadow: 0 18px 40px rgba(0, 0, 0, .35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-list a {
    display: block;
    padding: .85rem .35rem;
    border-bottom: 1px solid rgba(192, 196, 204, .12);
    font-size: 1rem;
  }

  .nav-list a::before {
    display: none;
  }

  .nav-foot {
    display: block;
    margin: .9rem .35rem 0;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: .75rem;
    letter-spacing: .02em;
  }
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    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;
  }

  .sync-dot {
    animation: none;
  }

  .scroll-progress {
    display: none;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}