:root {
  --color-bg-primary: #0A1A2F;
  --color-bg-secondary: #F5F2EB;
  --color-accent: #00E676;
  --color-accent-alt: #FF6A00;
  --color-text-on-dark: #F0F4F8;
  --color-text-on-light: #2B1E16;
  --color-data-blue: #1E90FF;
  --color-grid: #1D3B5C;
  --color-muted: #B0BEC5;
  --color-error: #9E2B20;
  --font-headline: "Noto Sans SC", "Impact", "Arial Black", sans-serif;
  --font-body: "Roboto", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "Liberation Mono", monospace;
  --container-max-width: 1280px;
  --header-height: 80px;
  --transition-speed: 200ms;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-primary);
  color: var(--color-text-on-dark);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

ul,
ol {
  list-style: none;
}

.site-container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  background: var(--color-accent);
  color: var(--color-bg-primary);
  padding: 8px 16px;
  font-weight: 700;
  z-index: 1000;
  transform: translateY(-100%);
  transition: transform var(--transition-speed) ease;
  font-family: var(--font-headline);
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg-primary);
}

.site-header {
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-grid);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__status {
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--color-grid);
}

.site-header__status-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 32px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-muted);
}

.site-header__ticker {
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-grid);
  overflow: hidden;
  white-space: nowrap;
  position: relative;
}

.site-header__ticker-inner {
  display: inline-flex;
  align-items: center;
  gap: 48px;
  padding: 6px 0;
  animation: ticker-scroll 35s linear infinite;
  will-change: transform;
}

.site-header__ticker:hover .site-header__ticker-inner {
  animation-play-state: paused;
}

.ticker__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-text-on-dark);
}

@keyframes ticker-scroll {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.site-header__main {
  position: relative;
  background-color: var(--color-bg-primary);
  background-image:
    linear-gradient(rgba(30, 144, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 144, 255, 0.05) 1px, transparent 1px);
  background-size: 24px 24px;
}

.site-header__main::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 100%;
  background: linear-gradient(135deg, transparent 50%, rgba(255, 106, 0, 0.25) 50%);
  pointer-events: none;
}

.site-header__main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
  position: relative;
}

.site-header__brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  flex-shrink: 0;
}

.site-header__logo {
  font-family: var(--font-headline);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text-on-dark);
  letter-spacing: 0.02em;
  transition: color var(--transition-speed) ease;
  text-transform: uppercase;
}

.site-header__logo:hover {
  color: var(--color-accent);
}

.site-header__slogan {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  border-left: 2px solid var(--color-accent-alt);
  padding-left: 8px;
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: 4px;
}

.nav-list__item {
  margin: 0;
}

.nav-list__item a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-family: var(--font-headline);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text-on-dark);
  position: relative;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.nav-list__num {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-accent);
  opacity: 0.8;
}

.nav-list__item a:hover {
  background-color: rgba(255, 106, 0, 0.2);
  color: #fff;
}

.nav-list__item a[aria-current="page"] {
  background-color: rgba(0, 230, 118, 0.1);
  box-shadow: inset 0 -3px 0 0 var(--color-accent);
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: 1px solid var(--color-grid);
  padding: 8px 12px;
  cursor: pointer;
  align-items: center;
}

.toggle__bar {
  width: 20px;
  height: 2px;
  background-color: var(--color-text-on-dark);
  transition: background-color var(--transition-speed) ease;
}

.toggle__text {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--color-text-on-dark);
}

.site-header__toggle:hover .toggle__bar {
  background-color: var(--color-accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-headline);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease, color var(--transition-speed) ease;
  border: 2px solid transparent;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-bg-primary);
}

.btn--primary:hover {
  background-color: #00c853;
  box-shadow: 0 4px 20px rgba(0, 230, 118, 0.3);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--color-grid);
  color: var(--color-text-on-dark);
}

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

.hud-frame {
  position: relative;
  padding: 32px;
  background-color: var(--color-bg-primary);
  background-image:
    linear-gradient(rgba(30, 144, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 144, 255, 0.08) 1px, transparent 1px);
  background-size: 16px 16px;
  border: 1px solid var(--color-grid);
  overflow: hidden;
}

.hud-frame__corner {
  position: absolute;
  width: 24px;
  height: 24px;
  border: 3px solid var(--color-accent);
}

.hud-frame__corner--tl {
  top: 8px;
  left: 8px;
  border-right: none;
  border-bottom: none;
}

.hud-frame__corner--tr {
  top: 8px;
  right: 8px;
  border-left: none;
  border-bottom: none;
}

.hud-frame__corner--bl {
  bottom: 8px;
  left: 8px;
  border-right: none;
  border-top: none;
}

.hud-frame__corner--br {
  bottom: 8px;
  right: 8px;
  border-left: none;
  border-top: none;
}

.chapter-number {
  font-family: var(--font-data);
  font-size: clamp(80px, 16vw, 200px);
  font-weight: 700;
  line-height: 0.8;
  color: rgba(240, 244, 248, 0.04);
  position: absolute;
  top: 0;
  right: 0;
  z-index: 0;
  pointer-events: none;
}

.data-bar {
  display: block;
  width: 100%;
  height: 8px;
  background-color: var(--color-grid);
  overflow: hidden;
}

.data-bar__fill {
  display: block;
  height: 100%;
  background-color: var(--color-accent);
  transition: width var(--transition-speed) ease;
}

.data-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background-color: rgba(0, 230, 118, 0.15);
  border: 1px solid rgba(0, 230, 118, 0.4);
  border-radius: 2px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.image-placeholder {
  background-color: var(--color-bg-primary);
  border: 1px dashed var(--color-grid);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-family: var(--font-data);
  font-size: 14px;
  position: relative;
  overflow: hidden;
}

.site-footer {
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-grid);
  margin-top: auto;
  position: relative;
  background-image:
    linear-gradient(rgba(30, 144, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 144, 255, 0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.site-footer__logo {
  font-family: var(--font-headline);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text-on-dark);
  display: block;
  margin-bottom: 12px;
}

.site-footer__desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  max-width: 320px;
}

.site-footer__heading {
  font-family: var(--font-headline);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-on-dark);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.site-footer__link-list li {
  margin-bottom: 10px;
}

.site-footer__link-list a {
  font-size: 14px;
  color: var(--color-muted);
  transition: color var(--transition-speed) ease, padding-left var(--transition-speed) ease;
  position: relative;
  padding-left: 12px;
}

.site-footer__link-list a::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-family: var(--font-data);
  transition: transform var(--transition-speed) ease;
}

.site-footer__link-list a:hover {
  color: var(--color-accent);
  padding-left: 16px;
}

.site-footer__contact p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 8px;
  font-family: var(--font-body);
}

.site-footer__bottom {
  background-color: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--color-grid);
}

.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 48px;
  flex-wrap: wrap;
  gap: 8px;
}

.site-footer__bottom p {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-muted);
}

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

.site-footer__bottom a:hover {
  color: var(--color-accent);
}

@media (max-width: 1024px) {
  .site-header__main-inner {
    flex-wrap: wrap;
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .site-header__nav {
    order: 3;
    width: 100%;
  }

  .nav-list {
    width: 100%;
    justify-content: space-between;
  }

  .nav-list__item a {
    padding: 8px 10px;
    font-size: 14px;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .site-container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .site-header__main-inner {
    flex-wrap: nowrap;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .site-header__slogan {
    display: none;
  }

  .site-header__logo {
    font-size: 20px;
  }

  .site-header__toggle {
    display: flex;
    flex-direction: row;
  }

  .site-header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg-primary);
    border-top: 1px solid var(--color-grid);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
  }

  .site-header__nav[data-open] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 8px 16px 16px;
  }

  .nav-list__item a {
    width: 100%;
    padding: 14px 8px;
    border-bottom: 1px solid var(--color-grid);
    font-size: 16px;
  }

  .nav-list__item:last-child a {
    border-bottom: none;
  }

  .site-header__main::after {
    display: none;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 48px;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }
}

@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;
  }

  .site-header__ticker-inner {
    animation: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .site-header__nav-list a {
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  }
}