:root {
  --color-space: #0A1628;
  --color-track: #00D4A0;
  --color-gold: #F5B041;
  --color-snow: #F8F9FA;
  --color-ink: #1A1A1A;
  --color-cream: #FDF6EC;
  --color-mist: #E5E8EB;
  --color-red: #E74C3C;
  --color-lake: #2E86C1;
  --color-data: #12CBC4;
  --font-head: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", monospace;
  --container-max: 1200px;
}
*, *::before, *::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--color-space);
  color: var(--color-snow);
  font-family: var(--font-body);
  line-height: 1.6;
}
h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
p {
  margin: 0;
}
ul, ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
img {
  display: block;
  max-width: 100%;
}
a {
  color: var(--color-track);
  text-decoration: none;
}
a:hover {
  color: var(--color-gold);
}
button {
  font: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}
:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 3px;
}
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}
.page-wrap {
  min-height: 60vh;
  background: var(--color-space);
}
.skip-link {
  position: absolute;
  top: -200%;
  left: 1rem;
  z-index: 2000;
  background: var(--color-gold);
  color: var(--color-ink);
  padding: 0.65rem 1rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}
.skip-link:focus {
  top: 0.75rem;
}
.site-header {
  position: relative;
  z-index: 1000;
  background: var(--color-space);
  color: var(--color-snow);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.header-rule {
  height: 4px;
  background: linear-gradient(90deg, var(--color-track) 0%, var(--color-data) 18%, var(--color-gold) 18%, var(--color-gold) 26%, var(--color-space) 26%);
}
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1100;
  width: 100%;
  height: 3px;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.08);
}
.scroll-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-track) 0%, var(--color-data) 70%, var(--color-gold) 100%);
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.75rem, 3vw, 2rem);
  padding-block: clamp(1.25rem, 3vw, 2.5rem);
}
.masthead-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  color: var(--color-snow);
  text-decoration: none;
  line-height: 1;
  transition: color 0.15s;
}
.masthead-brand:hover {
  color: var(--color-gold);
}
.masthead-brand:hover .brand-sub {
  color: var(--color-gold);
}
.brand-cn {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: 0.06em;
  line-height: 1;
}
.brand-sub {
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  color: var(--color-track);
  text-transform: uppercase;
  margin-top: 0.5rem;
}
.masthead-meta {
  max-width: 190px;
  margin: 0;
}
.masthead-meta--left {
  border-left: 2px solid var(--color-track);
  padding-left: 0.75rem;
}
.masthead-meta--right {
  border-right: 2px solid var(--color-gold);
  padding-right: 0.75rem;
  text-align: right;
}
.meta-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--color-gold);
}
.meta-text {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  color: var(--color-snow);
  opacity: 0.75;
}
.nav-shell {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
}
.site-nav {
  visibility: visible;
}
.nav-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
  padding: 0.65rem 0.5rem;
}
.nav-item {
  margin: 0;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.45rem 0.7rem 0.5rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  color: var(--color-snow);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.15s;
}
.nav-link:hover {
  background: var(--color-track);
  color: var(--color-space);
}
.nav-link:hover::after {
  background: var(--color-space);
  transform: scaleX(1);
}
.nav-link[aria-current="page"] {
  color: var(--color-gold);
}
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: transparent;
  color: var(--color-snow);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.85rem;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}
.nav-toggle:hover {
  border-color: var(--color-track);
}
.nav-toggle[aria-expanded="true"] {
  background: var(--color-track);
  border-color: var(--color-track);
  color: var(--color-space);
}
.nav-toggle-label {
  display: inline-block;
}
.nav-toggle-burger {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 14px;
}
.nav-toggle-burger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.15s, opacity 0.15s;
}
.nav-toggle-burger span:nth-child(1) {
  top: 0;
}
.nav-toggle-burger span:nth-child(2) {
  top: 6px;
}
.nav-toggle-burger span:nth-child(3) {
  top: 12px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-burger span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-burger span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-burger span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--color-space);
  color: var(--color-snow);
  border-top: 4px solid var(--color-track);
}
.footer-orbit {
  position: absolute;
  top: -190px;
  right: -140px;
  width: 380px;
  height: 380px;
  border: 1px solid rgba(0, 212, 160, 0.18);
  border-radius: 50%;
  pointer-events: none;
}
.footer-orbit::before {
  content: "";
  position: absolute;
  inset: 2.2rem;
  border: 1px dashed rgba(245, 176, 65, 0.2);
  border-radius: 50%;
}
.footer-orbit::after {
  content: "";
  position: absolute;
  inset: 4.5rem;
  border: 1px solid rgba(248, 249, 250, 0.08);
  border-radius: 50%;
}
.footer-main {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 2rem;
  padding-block: 3rem 2rem;
  position: relative;
  z-index: 1;
}
.footer-logo {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.6rem;
  letter-spacing: 0.06em;
}
.footer-tagline {
  margin: 0.25rem 0 1rem;
  color: var(--color-track);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}
.footer-about {
  max-width: 42ch;
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(248, 249, 250, 0.72);
}
.footer-heading {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-head);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.28em;
  color: var(--color-gold);
  text-transform: uppercase;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.footer-links li + li {
  margin-top: 0.45rem;
}
.footer-links a {
  display: inline-block;
  color: rgba(248, 249, 250, 0.78);
  font-size: 0.92rem;
  transition: color 0.15s, transform 0.15s;
}
.footer-links a:hover {
  color: var(--color-track);
  transform: translateX(0.25rem);
}
.footer-contact-list {
  font-size: 0.88rem;
  color: rgba(248, 249, 250, 0.75);
}
.footer-contact-list li {
  display: flex;
  gap: 0.6rem;
  line-height: 1.7;
}
.footer-contact-list .contact-label {
  color: var(--color-gold);
  min-width: 3.5em;
}
.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding-block: 1.2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(248, 249, 250, 0.5);
  font-size: 0.78rem;
  text-align: center;
}
.footer-bottom p {
  margin: 0;
}
.footer-trust {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(18, 203, 196, 0.7);
}
.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 900;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  background: var(--color-track);
  color: var(--color-space);
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  opacity: 0;
  transform: translateY(0.75rem);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s, background 0.15s;
}
.to-top[data-show] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.to-top:hover {
  background: var(--color-gold);
}
.to-top-icon {
  display: inline-block;
  font-size: 1.1rem;
  line-height: 1;
}
.page-header {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2.5rem, 7vw, 5rem);
  background: linear-gradient(135deg, var(--color-space), #10233f 60%, var(--color-space));
  border-bottom: 1px solid rgba(0, 212, 160, 0.2);
}
.page-header::after {
  content: "";
  position: absolute;
  right: -2rem;
  top: 0;
  width: 45%;
  height: 100%;
  background: linear-gradient(115deg, transparent 40%, rgba(0, 212, 160, 0.06), transparent 90%);
  transform: skewX(-15deg);
  pointer-events: none;
}
.page-title {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4rem);
}
.page-intro {
  max-width: 62ch;
  margin: 1rem 0 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: rgba(248, 249, 250, 0.72);
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  color: rgba(248, 249, 250, 0.6);
}
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--color-gold);
}
.breadcrumb-link {
  color: var(--color-track);
}
.breadcrumb-link:hover {
  color: var(--color-gold);
}
.breadcrumb-current {
  color: var(--color-snow);
  opacity: 0.85;
}
.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
  background: var(--color-cream);
  color: var(--color-ink);
}
.section--dark {
  background: var(--color-space);
  color: var(--color-snow);
}
.section--cream {
  background: var(--color-cream);
  color: var(--color-ink);
}
.section--mist {
  background: var(--color-mist);
  color: var(--color-ink);
}
.section-head {
  max-width: 760px;
  margin-bottom: 2rem;
}
.section-kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  color: var(--color-track);
  text-transform: uppercase;
}
.section-kicker::before {
  content: "";
  width: 1.6rem;
  height: 2px;
  background: var(--color-gold);
}
.section-title {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 3rem);
}
.section-desc {
  max-width: 60ch;
  margin: 0.8rem 0 0;
  font-size: 1rem;
  line-height: 1.8;
  opacity: 0.78;
}
.lead {
  font-size: 1.15rem;
  line-height: 1.8;
  max-width: 48rem;
}
.content-narrow {
  max-width: 720px;
  margin-inline: auto;
}
.content-wide {
  max-width: 1200px;
  margin-inline: auto;
}
.grid {
  display: grid;
  gap: 1.5rem;
}
.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.grid--asym {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
}
.grid--invert {
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
}
.card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: var(--color-cream);
  color: var(--color-ink);
  border: 1px solid var(--color-mist);
  border-top: 3px solid var(--color-track);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
}
.card:hover {
  border-color: var(--color-track);
  box-shadow: 8px 8px 0 rgba(0, 212, 160, 0.15);
  transform: translateY(-2px);
}
.card--dark {
  background: var(--color-space);
  border-color: rgba(255, 255, 255, 0.08);
  border-top-color: var(--color-gold);
  color: var(--color-snow);
}
.card--dark:hover {
  border-color: var(--color-gold);
  box-shadow: 8px 8px 0 rgba(245, 176, 65, 0.12);
}
.card-title {
  margin-bottom: 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.15rem;
  line-height: 1.3;
}
.card-text {
  margin-bottom: 1rem;
  font-size: 0.92rem;
  line-height: 1.7;
  opacity: 0.8;
}
.card-link {
  margin-top: auto;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--color-track);
}
.card-link:hover {
  color: var(--color-gold);
}
.data-card {
  display: block;
  padding: 1.25rem;
  background: var(--color-space);
  color: var(--color-snow);
  border-left: 3px solid var(--color-data);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.25);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.data-card:hover {
  border-left-color: var(--color-gold);
  box-shadow: 10px 10px 0 rgba(245, 176, 65, 0.15);
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
  color: var(--color-track);
  letter-spacing: -0.02em;
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-snow);
  opacity: 0.65;
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  white-space: nowrap;
  border: 1px solid currentColor;
  line-height: 1.4;
}
.tag--gold {
  color: var(--color-gold);
}
.tag--red {
  color: var(--color-red);
}
.tag--track {
  color: var(--color-track);
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.2rem;
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.button--primary {
  background: var(--color-track);
  color: var(--color-space);
}
.button--primary:hover {
  background: var(--color-gold);
  color: var(--color-space);
}
.button--ghost {
  background: transparent;
  border-color: rgba(248, 249, 250, 0.45);
  color: var(--color-snow);
}
.button--ghost:hover {
  border-color: var(--color-track);
  color: var(--color-track);
}
.button--gold {
  background: var(--color-gold);
  color: var(--color-space);
}
.button--gold:hover {
  background: var(--color-track);
  color: var(--color-space);
}
.annotation {
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--color-lake);
  line-height: 1.7;
}
.annotation--vertical {
  writing-mode: vertical-rl;
  border-right: 1px solid var(--color-mist);
  padding-right: 0.65rem;
  text-orientation: mixed;
}
.section--dark .annotation {
  color: var(--color-data);
}
.cut-line {
  display: block;
  width: min(280px, 100%);
  height: 3px;
  margin: 1.25rem 0;
  background: linear-gradient(90deg, var(--color-track), var(--color-data) 50%, var(--color-gold));
  transform: skewX(-18deg);
}
.data-flow {
  position: relative;
  height: 2px;
  margin-block: 2rem;
  background: linear-gradient(90deg, transparent, rgba(18, 203, 196, 0.8) 20%, rgba(245, 176, 65, 0.7) 80%, transparent);
  opacity: 0.6;
}
.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-space), #1E3A5F);
}
.media-frame--wide {
  aspect-ratio: 21 / 9;
}
.media-frame--portrait {
  aspect-ratio: 3 / 4;
}
.media-frame--cut {
  clip-path: polygon(0 0, calc(100% - 1.25rem) 0, 100% 1.25rem, 100% 100%, 0 100%);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame .placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: rgba(248, 249, 250, 0.4);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.media-frame[data-caption]::after {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.3rem 0.7rem;
  background: var(--color-space);
  color: var(--color-track);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  pointer-events: none;
}
.prose {
  max-width: 70ch;
  font-size: 1rem;
  line-height: 1.85;
  color: inherit;
}
.prose p {
  margin-bottom: 1rem;
}
.prose h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.6rem;
}
.prose ul {
  list-style: disc;
  padding-left: 1.2rem;
  margin-bottom: 1rem;
}
.prose li {
  margin-bottom: 0.35rem;
}
@media (max-width: 980px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 820px) {
  .masthead-meta--right {
    display: none;
  }
  .nav-shell {
    display: flex;
    justify-content: flex-end;
    padding: 0.55rem 1rem;
  }
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: min(80vw, 360px);
    height: 100vh;
    padding: 1.5rem;
    background: var(--color-space);
    border-right: 1px solid rgba(0, 212, 160, 0.4);
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform 0.2s, visibility 0.2s;
    z-index: 1050;
  }
  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    box-shadow: 12px 0 40px rgba(0, 0, 0, 0.5);
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.35rem;
    padding-top: 2rem;
  }
  .nav-link {
    display: block;
    padding: 0.7rem 0.6rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .nav-link[aria-current="page"] {
    background: rgba(245, 176, 65, 0.12);
  }
  .nav-toggle {
    display: inline-flex;
  }
}
@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--asym,
  .grid--invert {
    grid-template-columns: minmax(0, 1fr);
  }
  .footer-main {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-block: 2rem;
  }
  .masthead {
    justify-content: center;
  }
  .masthead-meta--left {
    display: none;
  }
  .nav-toggle-label {
    display: none;
  }
  .footer-bottom {
    text-align: center;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .card:hover,
  .footer-links a:hover {
    transform: none;
  }
}