:root {
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
  --bg: #0A0A14;
  --bg-deep: #131226;
  --purple: #3B2D6E;
  --purple-bright: #7A5CFF;
  --silver: #F4F4F8;
  --gray: #A6A6C2;
  --blue: #00C2FF;
  --orange: #FF6D2B;
  --glass: rgba(255,255,255,0.08);
  --line: rgba(255,255,255,0.14);
  --container: 1560px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 130px;
  background: var(--bg);
}

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

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.4;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.8;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 72% 12%, rgba(123, 92, 255, 0.2), transparent 30rem),
    radial-gradient(circle at 18% 42%, rgba(0, 194, 255, 0.1), transparent 24rem),
    radial-gradient(1px 1px at 15% 25%, rgba(255, 255, 255, 0.65), transparent 100%),
    radial-gradient(1px 1px at 80% 18%, rgba(255, 255, 255, 0.55), transparent 100%),
    radial-gradient(1px 1px at 40% 75%, rgba(123, 92, 255, 0.8), transparent 100%),
    radial-gradient(2px 2px at 92% 55%, rgba(0, 194, 255, 0.6), transparent 100%);
  background-repeat:
    no-repeat,
    no-repeat,
    repeat,
    repeat,
    repeat,
    repeat;
  background-size:
    auto,
    auto,
    240px 240px,
    360px 360px,
    420px 420px,
    520px 520px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-body);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--silver);
}

p {
  margin-bottom: 0;
}

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

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

:focus:not(:focus-visible) {
  outline: none;
}

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

::selection {
  background: var(--blue);
  color: var(--bg);
  text-shadow: none;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--orange);
  color: var(--bg);
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  border-radius: 2px;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 20, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-shell {
  position: relative;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 32px;
}

.topline {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-block: 8px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--gray);
}

.header-coord {
  color: var(--purple-bright);
}

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

.topline-tagline {
  margin-left: auto;
  color: var(--gray);
}

.header-cols {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 16px;
}

.header-cols > .brand,
.header-cols > .nav-toggle {
  position: relative;
  z-index: 1100;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  line-height: 1.1;
}

.brand-slash {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--blue);
}

.brand-name {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--silver);
}

.brand-tagline {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--gray);
  text-transform: uppercase;
}

.brand:hover .brand-name {
  color: var(--blue);
}

.main-nav {
  display: flex;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-item {
  flex: none;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--silver);
  transition:
    color 0.2s ease-out,
    border-color 0.2s ease-out,
    background 0.2s ease-out,
    right 0.2s ease-out;
}

.nav-link::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--purple-bright), var(--blue));
  opacity: 0;
}

.nav-link:hover {
  color: var(--blue);
  background: rgba(0, 194, 255, 0.06);
  border-color: rgba(0, 194, 255, 0.22);
}

.nav-link:hover::before {
  right: 0;
  opacity: 1;
}

.nav-link[aria-current="page"] {
  color: var(--blue);
  background: rgba(0, 194, 255, 0.1);
  border-color: rgba(0, 194, 255, 0.28);
}

.nav-link[aria-current="page"]::before {
  right: 0;
  opacity: 1;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--silver);
  font-family: var(--font-data);
  font-size: 12px;
  cursor: pointer;
}

.nav-toggle-label {
  letter-spacing: 1px;
}

.nav-icon {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 2px;
  background: var(--silver);
}

.nav-icon::before,
.nav-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--silver);
  transition:
    transform 0.2s ease-out,
    top 0.2s ease-out,
    background 0.2s ease-out;
}

.nav-icon::before {
  top: -6px;
}

.nav-icon::after {
  top: 6px;
}

.nav-toggle:hover .nav-icon {
  background: transparent;
}

.nav-toggle:hover .nav-icon::before,
.nav-toggle:hover .nav-icon::after {
  background: var(--blue);
}

.main-nav[data-open] ~ .nav-toggle {
  border-color: var(--blue);
}

.main-nav[data-open] ~ .nav-toggle .nav-icon {
  background: transparent;
}

.main-nav[data-open] ~ .nav-toggle .nav-icon::before {
  top: 0;
  transform: rotate(45deg);
  background: var(--blue);
}

.main-nav[data-open] ~ .nav-toggle .nav-icon::after {
  top: 0;
  transform: rotate(-45deg);
  background: var(--blue);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1200;
  width: 100%;
  height: 3px;
  display: block;
  background: transparent;
}

.scroll-progress-fill {
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background: linear-gradient(90deg, var(--purple-bright), var(--blue) 60%, var(--orange));
  transition: width 0.05s linear;
}

.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: 80px;
  background: linear-gradient(180deg, var(--bg-deep), var(--bg) 70%);
  border-top: 1px solid var(--line);
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 4fr 2fr 2fr 3fr;
  gap: 32px;
  max-width: var(--container);
  margin-inline: auto;
  padding: 64px 32px 48px;
}

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

.footer-about {
  margin-top: 16px;
  max-width: 38em;
  color: var(--gray);
  font-size: 14px;
  line-height: 1.8;
}

.footer-links {
  display: flex;
  flex-direction: column;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--blue);
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.footer-heading::before {
  content: "//";
  color: var(--purple-bright);
}

.footer-list {
  display: grid;
  gap: 8px;
  list-style: none;
}

.footer-link {
  display: inline-block;
  padding-left: 12px;
  border-left: 2px solid transparent;
  color: var(--silver);
  font-size: 14px;
  transition:
    border-color 0.2s ease,
    color 0.2s ease;
}

.footer-link:hover {
  border-left-color: var(--blue);
  color: var(--blue);
}

.footer-contact p {
  margin-bottom: 8px;
  color: var(--gray);
  font-size: 14px;
}

.footer-bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  max-width: var(--container);
  margin-inline: auto;
  padding: 20px 32px;
  border-top: 1px solid var(--line);
  color: var(--gray);
  font-family: var(--font-data);
  font-size: 12px;
}

.footer-icp {
  order: 1;
}

.copyright {
  order: 2;
}

.back-to-top {
  position: relative;
  order: 3;
  margin-left: auto;
  padding-right: 18px;
  color: var(--blue);
  font-family: var(--font-data);
  font-size: 12px;
}

.back-to-top::after {
  content: "↑";
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  color: var(--orange);
}

.back-to-top:hover {
  color: var(--orange);
}

.footer-watermark {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.footer-watermark::after {
  content: "STARFIELD";
  position: absolute;
  right: -20px;
  bottom: -20px;
  font-family: var(--font-body);
  font-size: clamp(80px, 18vw, 200px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.025);
}

.site-main {
  flex: 1;
  width: 100%;
}

.page-container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 32px;
}

.section {
  position: relative;
  padding-block: 72px;
}

.section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  margin-bottom: 32px;
}

.section-index {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--purple-bright);
}

.section-title {
  font-size: clamp(28px, 5vw, 44px);
  letter-spacing: -0.02em;
}

.section-desc {
  max-width: 720px;
  margin-top: 8px;
  color: var(--gray);
  font-size: 14px;
  line-height: 1.8;
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.col-span-3 {
  grid-column: span 3;
}

.col-span-4 {
  grid-column: span 4;
}

.col-span-6 {
  grid-column: span 6;
}

.col-span-8 {
  grid-column: span 8;
}

.col-span-12 {
  grid-column: span 12;
}

.blueprint-grid {
  position: relative;
  min-height: 160px;
  padding: 24px;
  border: 1px solid var(--line);
  background-color: rgba(255, 255, 255, 0.03);
  background-image:
    linear-gradient(rgba(0, 194, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 194, 255, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
}

.blueprint-grid::before {
  content: attr(data-coordinate);
  position: absolute;
  top: 8px;
  right: 10px;
  font-family: var(--font-data);
  font-size: 10px;
  color: var(--blue);
  opacity: 0.75;
}

.glass-panel {
  padding: 24px;
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.tilt-panel {
  position: relative;
  isolation: isolate;
  padding: 24px;
}

.tilt-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border: 1px solid rgba(0, 194, 255, 0.28);
  background: linear-gradient(135deg, rgba(123, 92, 255, 0.28), rgba(0, 194, 255, 0.08));
  transform: skewX(-4deg);
  transform-origin: left bottom;
}

.tilt-panel::after {
  content: "";
  position: absolute;
  top: 12px;
  right: 12px;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--glass);
  color: var(--silver);
  font-family: var(--font-data);
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition:
    background 0.2s ease-out,
    border-color 0.2s ease-out,
    color 0.2s ease-out,
    transform 0.1s ease-out;
}

.btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--bg);
  font-weight: 700;
}

.btn-primary:hover {
  background: transparent;
  border-color: var(--orange);
  color: var(--orange);
}

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

.btn-ghost:hover {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--bg);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--silver);
  font-family: var(--font-data);
  font-size: 12px;
  line-height: 1.4;
}

.tag-blue {
  border-color: rgba(0, 194, 255, 0.45);
  color: var(--blue);
}

.tag-purple {
  border-color: rgba(122, 92, 255, 0.5);
  color: var(--purple-bright);
}

.tag-orange {
  border-color: rgba(255, 109, 43, 0.5);
  color: var(--orange);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--glass);
  color: var(--silver);
  font-family: var(--font-data);
  font-size: 12px;
}

.chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
}

.chip[data-tone="orange"]::before {
  background: var(--orange);
}

.chip[data-tone="purple"]::before {
  background: var(--purple-bright);
}

.index-code {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.5px;
  color: var(--purple-bright);
}

.data-note {
  padding-left: 12px;
  border-left: 2px solid var(--purple-bright);
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--gray);
}

.arena-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--gray);
  font-family: var(--font-data);
  font-size: 12px;
}

.arena-divider::before,
.arena-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line) 60%, transparent);
}

.breadcrumb {
  margin-bottom: 24px;
  font-family: var(--font-data);
  font-size: 12px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  color: var(--gray);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 8px;
  color: var(--gray);
}

.breadcrumb-link {
  color: var(--gray);
  transition: color 0.2s ease;
}

.breadcrumb-link:hover {
  color: var(--blue);
}

.breadcrumb-current {
  color: var(--silver);
}

@media (max-width: 991px) {
  html.js .nav-toggle {
    display: inline-flex;
  }

  html.js .main-nav {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 108px 40px 48px;
    background: rgba(10, 10, 20, 0.97);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
      opacity 0.25s ease-out,
      visibility 0s linear 0.25s;
  }

  html.js .main-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition-delay: 0s;
  }

  html.js .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  html.js .nav-link {
    padding: 8px 0;
    border: 0;
    background: transparent;
    font-size: 24px;
  }

  html.js .nav-link::before {
    bottom: 2px;
  }

  .header-cols {
    flex-wrap: wrap;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .col-span-3,
  .col-span-4,
  .col-span-6,
  .col-span-8 {
    grid-column: span 12;
  }
}

@media (min-width: 992px) {
  html.js .main-nav {
    position: static;
    display: flex;
    padding: 0;
    background: transparent;
    backdrop-filter: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: none;
  }

  html.js .nav-list {
    flex-direction: row;
    align-items: center;
    gap: 4px;
  }

  html.js .nav-toggle {
    display: none;
  }
}

@media (max-width: 767px) {
  .header-shell {
    padding-inline: 20px;
  }

  .header-coord,
  .topline-tagline {
    display: none;
  }

  .topline-brand {
    margin-inline: auto;
  }

  .topline {
    font-size: 10px;
  }

  .brand-name {
    font-size: 22px;
  }

  .brand-tagline {
    font-size: 9px;
  }

  .nav-toggle-label {
    display: none;
  }

  .page-container {
    padding-inline: 20px;
  }

  .section {
    padding-block: 48px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    padding: 40px 20px 32px;
  }

  .footer-bottom {
    padding: 16px 20px;
  }

  .back-to-top {
    margin-left: 0;
  }

  .glass-panel,
  .tilt-panel {
    padding: 20px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}