:root {
  --c-space: #0A1128;
  --c-deep: #14213D;
  --c-green: #00E676;
  --c-orange: #FF6D00;
  --c-light: #F8F9FA;
  --c-bluegray: #B0B8C4;
  --c-green-border: #00E67666;
  --c-shadow: #00000066;
  --grad-green: linear-gradient(135deg, #00E676, #00B0FF);
  --font-head: "DIN Condensed", "Impact", "Arial Narrow", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-index: "Roboto Mono", monospace;
  --border-w: 3px;
  --shadow-lg: 8px 8px 0 0 var(--c-shadow);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--c-space);
  background-image:
    linear-gradient(rgba(0,230,118,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,230,118,0.03) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--c-light);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  text-transform: uppercase;
  transform: skew(-5deg);
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--c-light);
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-green);
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

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

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 2000;
  background: var(--c-orange);
  color: var(--c-space);
  padding: 8px 16px;
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

.container {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 64px;
}

/* Split Screen System */
@media (min-width: 1024px) {
  body {
    margin-left: 328px;
  }
}

/* Header */
.site-header {
  position: relative;
  background: var(--c-deep);
  border-bottom: var(--border-w) solid var(--c-green);
}

.site-header__bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  position: relative;
  z-index: 1001;
}

.site-brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.2;
}

.site-brand__logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 2rem;
  text-transform: uppercase;
  color: var(--c-light);
  letter-spacing: 0.05em;
  transform: skew(-5deg);
}

.site-brand__tagline {
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--c-green);
  text-transform: uppercase;
}

.site-header__panel {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.site-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  color: var(--c-light);
  text-decoration: none;
  font-weight: 600;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.site-nav__link:hover {
  color: var(--c-green);
  background: rgba(0, 230, 118, 0.05);
  border-left-color: var(--c-green);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-space);
  background: var(--c-green);
  border-left-color: var(--c-orange);
}

.site-nav__index {
  font-family: var(--font-index);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  margin-right: 12px;
  color: var(--c-bluegray);
}

.site-nav__link:hover .site-nav__index {
  color: var(--c-green);
}

.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--c-space);
}

.site-header__foot {
  margin-top: auto;
  padding-top: 24px;
}

.site-header__label {
  display: block;
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-bluegray);
  margin-bottom: 8px;
}

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

.nav-toggle {
  display: block;
  background: none;
  border: none;
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 8px;
  position: relative;
}

.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-light);
  margin: 6px auto;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Desktop Capsule */
@media (min-width: 1024px) {
  .site-header {
    position: fixed;
    top: 24px;
    left: 24px;
    width: 280px;
    height: calc(100vh - 48px);
    border: var(--border-w) solid var(--c-green);
    border-radius: 32px;
    box-shadow: var(--shadow-lg);
    padding: 32px 24px;
    overflow: hidden;
    z-index: 1000;
  }

  .site-header::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(120deg, transparent 30%, rgba(0, 230, 118, 0.1) 50%, transparent 70%);
    background-size: 200% 200%;
    animation: dataStream 4s ease-in-out infinite;
    pointer-events: none;
  }

  .nav-toggle {
    display: none;
  }

  .site-header__bar {
    padding: 0;
    margin-bottom: 24px;
  }

  .site-header__panel {
    position: relative;
    z-index: 1;
  }
}

@keyframes dataStream {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Mobile Drawer */
@media (max-width: 1023px) {
  body.nav-open::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(10, 17, 40, 0.8);
    z-index: 998;
  }

  .site-header__panel {
    position: fixed;
    top: 0;
    left: 0;
    width: min(80%, 320px);
    height: 100vh;
    padding: 24px;
    background: var(--c-deep);
    border-right: var(--border-w) solid var(--c-green);
    border-radius: 0 32px 32px 0;
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 999;
  }

  .site-header__panel[data-open="true"] {
    transform: translateX(0);
  }

  .site-header__bar {
    width: 100%;
  }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-family: var(--font-body);
  font-weight: 600;
  text-decoration: none;
  border: 3px solid var(--c-green);
  color: var(--c-green);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  line-height: 1.2;
}

.btn:hover {
  background: var(--c-green);
  color: var(--c-space);
  box-shadow: var(--shadow-lg);
  transform: translate(-2px, -2px);
}

.btn--sm {
  padding: 6px 12px;
  font-size: 0.75rem;
  border-width: 2px;
}

.btn--ghost {
  border-color: var(--c-bluegray);
  color: var(--c-bluegray);
}

.btn--ghost:hover {
  border-color: var(--c-orange);
  background: var(--c-orange);
  color: var(--c-space);
}

.btn--primary {
  background: var(--grad-green);
  border: none;
  color: var(--c-space);
  font-weight: 800;
}

.btn--primary:hover {
  box-shadow: 0 0 24px var(--c-green);
  transform: translateY(-2px);
}

/* Cards & Grid */
.card {
  background: var(--c-deep);
  border: var(--border-w) solid var(--c-deep);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 12px 12px 0 0 var(--c-shadow);
}

.card--accent {
  border-color: var(--c-green);
}

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

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

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

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

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

/* Media Placeholder */
.media {
  position: relative;
  overflow: hidden;
  background: var(--c-deep);
  border: 3px solid var(--c-green-border);
  aspect-ratio: 16 / 9;
}

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

.media--portrait {
  aspect-ratio: 3 / 4;
}

.media--hero {
  border-color: var(--c-orange);
}

/* Breadcrumbs */
.breadcrumbs {
  font-family: var(--font-index);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-bluegray);
  padding-block: 16px;
}

.breadcrumbs a {
  color: var(--c-green);
  text-decoration: none;
}

.breadcrumbs a[aria-current="page"] {
  color: var(--c-light);
}

/* Footer */
.site-footer {
  position: relative;
  background: var(--c-deep);
  padding: 48px 0 24px;
  margin-top: 64px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--c-green), var(--c-orange));
  clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
}

.site-footer__grid {
  display: grid;
  gap: 32px;
  grid-template-columns: 2fr 1fr 1.5fr;
}

.site-footer__logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.5rem;
  text-transform: uppercase;
  transform: skew(-5deg);
  color: var(--c-light);
  margin: 0 0 8px;
}

.site-footer__trust {
  color: var(--c-bluegray);
  font-size: 0.85rem;
  margin: 0;
}

.site-footer__heading {
  font-family: var(--font-index);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-green);
  margin: 0 0 12px;
}

.site-footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--c-bluegray);
  font-size: 0.9rem;
  line-height: 1.8;
}

.site-footer__list--flat {
  display: flex;
  flex-direction: column;
}

.site-footer__list a {
  color: var(--c-light);
  text-decoration: none;
}

.site-footer__list a:hover {
  color: var(--c-orange);
}

.site-footer__bottom {
  border-top: 1px solid var(--c-green-border);
  margin-top: 32px;
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--c-bluegray);
  font-size: 0.8rem;
}

.site-footer__copyright,
.site-footer__icp {
  margin: 0;
}

/* Scroll Progress */
.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  z-index: 1500;
  pointer-events: none;
}

.site-progress__bar {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--grad-green);
  box-shadow: 0 0 12px var(--c-green);
  transition: width 0.1s linear;
}

/* Back to Top */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-deep);
  border: 3px solid var(--c-green);
  color: var(--c-green);
  font-size: 1.5rem;
  text-decoration: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, background-color 0.2s ease;
  z-index: 1000;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--c-green);
  color: var(--c-space);
}

/* Utilities */
.text-gradient {
  background: var(--grad-green);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.text-orange {
  color: var(--c-orange);
}

.glow {
  box-shadow: 0 0 20px var(--c-green-border);
}

/* Responsive Adjustments */
@media (max-width: 1023px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .container {
    padding-inline: 16px;
  }

  .section {
    padding-block: 32px;
  }

  .grid {
    gap: 16px;
  }

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

  .card {
    padding: 16px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

  .site-header::before {
    animation: none;
  }

  .site-header__panel,
  .nav-toggle__bar,
  .btn,
  .card,
  .back-to-top {
    transition: none;
  }
}