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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-primary);
  background-color: var(--ink-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  width: 100%;
}

img, svg, video, canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

ul, ol {
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

:root {
  --ink-base: #0b1a2c;
  --ink-panel: #10233a;
  --ink-raised: #17304d;
  --neon-strike: #b7ff00;
  --gold-accent: #f5b942;
  --text-primary: #f7fbff;
  --text-secondary: #9db3c8;
  --line-border: #2b4a67;

  --font-display: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', Georgia, 'Times New Roman', serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-data: ui-monospace, 'SF Mono', 'Cascadia Mono', 'Roboto Mono', 'Courier New', monospace;

  --shell-width: 1240px;
  --shell-pad: clamp(20px, 4vw, 48px);
  --grid-gap: 24px;
  --chamfer: 16px;

  --transition-fast: 0.2s ease;
  --transition-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

::selection {
  background: var(--neon-strike);
  color: var(--ink-base);
}

:focus-visible {
  outline: 2px solid var(--neon-strike);
  outline-offset: 2px;
}

.site-shell,
.header-shell,
.footer-shell {
  width: min(var(--shell-width), 100%);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.content-container {
  max-width: 68ch;
  margin-inline: auto;
  padding: clamp(48px, 8vw, 96px) var(--shell-pad);
}

.content-container p {
  color: var(--text-secondary);
  margin-bottom: 1.5em;
}

.content-container h1,
.content-container h2,
.content-container h3 {
  font-family: var(--font-display);
  color: var(--text-primary);
  line-height: 1.25;
  margin: 1.6em 0 0.5em;
  transform: skewX(-2deg);
}

.content-container h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.content-container h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.content-container h3 {
  font-size: 1.25rem;
}

.display-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.12;
  color: var(--text-primary);
  transform: skewX(-2deg);
  letter-spacing: 0.02em;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.2;
  color: var(--text-primary);
  transform: skewX(-2deg);
}

.subtitle {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 56ch;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 28px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--line-border);
  cursor: pointer;
  text-align: center;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background var(--transition-base), border-color var(--transition-base), color var(--transition-base), transform var(--transition-base);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--neon-strike);
  color: var(--neon-strike);
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--neon-strike);
  border-color: var(--neon-strike);
  color: var(--ink-base);
  font-weight: 700;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: transparent;
  color: var(--neon-strike);
}

.btn-gold {
  background: var(--gold-accent);
  border-color: var(--gold-accent);
  color: var(--ink-base);
  font-weight: 700;
}

.btn-gold:hover,
.btn-gold:focus-visible {
  background: transparent;
  color: var(--gold-accent);
  border-color: var(--gold-accent);
}

.panel {
  background: var(--ink-panel);
  border: 1px solid rgba(43, 74, 103, 0.35);
  clip-path: polygon(var(--chamfer) 0, 100% 0, 100% calc(100% - var(--chamfer)), calc(100% - var(--chamfer)) 100%, 0 100%, 0 var(--chamfer));
}

.panel-raised {
  background: var(--ink-raised);
  border-color: rgba(43, 74, 103, 0.6);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  line-height: 1.4;
}

.legend-dot {
  width: 8px;
  height: 8px;
  background: var(--line-border);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.legend-dot-neon {
  background: var(--neon-strike);
}

.legend-dot-gold {
  background: var(--gold-accent);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-strike);
}

.section-tag::before {
  content: '';
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--neon-strike);
  flex-shrink: 0;
}

.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-panel);
  aspect-ratio: 16 / 9;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
}

.image-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 55%, rgba(183, 255, 0, 0.08));
  pointer-events: none;
}

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

.bg-speedlines {
  background-image: repeating-linear-gradient(
    120deg,
    transparent 0px,
    transparent 26px,
    rgba(183, 255, 0, 0.04) 26px,
    rgba(183, 255, 0, 0.04) 27px
  );
}

.data-figure {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 18px 0;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--neon-strike);
}

.breadcrumb-sep {
  width: 4px;
  height: 4px;
  background: var(--line-border);
  transform: rotate(45deg);
  flex-shrink: 0;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal][data-reveal-visible] {
  opacity: 1;
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background: rgba(11, 26, 44, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 2000;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  background: var(--neon-strike);
  color: var(--ink-base);
  font-size: 0.875rem;
  font-weight: 700;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transform: translateY(-160%);
  transition: transform var(--transition-fast);
}

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

.header-top {
  background: rgba(11, 26, 44, 0.9);
  border-bottom: 1px solid rgba(43, 74, 103, 0.6);
}

.header-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 34px;
}

.header-note {
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  flex: 1;
}

.header-version {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--neon-strike);
  text-transform: uppercase;
}

.header-version::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--neon-strike);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.header-main {
  position: relative;
  border-bottom: 1px solid var(--line-border);
  background: rgba(11, 26, 44, 0.86);
}

.header-main::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    120deg,
    transparent 0px,
    transparent 26px,
    rgba(183, 255, 0, 0.022) 26px,
    rgba(183, 255, 0, 0.022) 27px
  );
  pointer-events: none;
}

.header-main-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--neon-strike);
  color: var(--ink-base);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.125rem;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transform: skewX(-3deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.125rem;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  transform: skewX(-2deg);
}

.brand-sub {
  font-size: 0.6875rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 14px;
  background: var(--ink-panel);
  border: 1px solid var(--line-border);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--neon-strike);
}

.nav-toggle-box {
  position: relative;
  width: 20px;
  height: 14px;
  flex-shrink: 0;
}

.nav-toggle-burger,
.nav-toggle-burger::before,
.nav-toggle-burger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast), background var(--transition-fast), top var(--transition-fast);
}

.nav-toggle-burger {
  top: 6px;
}

.nav-toggle-burger::before {
  top: -6px;
}

.nav-toggle-burger::after {
  top: 6px;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-burger {
  background: transparent;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-burger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle-burger::after {
  top: 0;
  transform: rotate(-45deg);
}

.nav-toggle-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.06em;
}

.site-nav {
  flex-shrink: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 8px;
  height: 2px;
  background: var(--neon-strike);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link[aria-current='page']::after {
  transform: scaleX(1);
}

.nav-link[aria-current='page'] {
  color: var(--text-primary);
  font-weight: 600;
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--neon-strike);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  will-change: transform;
  z-index: 1;
}

.site-footer {
  position: relative;
  isolation: isolate;
  margin-top: auto;
  background: var(--ink-base);
  border-top: 1px solid var(--line-border);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 40%;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-strike), transparent);
  opacity: 0.5;
}

.footer-shell {
  padding-top: 64px;
  padding-bottom: 28px;
}

.footer-trust {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 18px 24px;
  margin-bottom: 48px;
  background: var(--ink-panel);
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}

.footer-trust::after {
  content: '';
  position: absolute;
  left: 16px;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: var(--neon-strike);
}

.footer-trust .legend-item {
  color: var(--text-primary);
  font-weight: 600;
  flex-shrink: 0;
}

.footer-trust p {
  flex: 1;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.8fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand-col,
.footer-col,
.footer-contact-col {
  min-width: 0;
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--text-primary);
  letter-spacing: 0.04em;
  transform: skewX(-2deg);
}

.footer-slogan {
  margin-top: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--neon-strike);
}

.footer-meta::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--neon-strike);
  transform: rotate(45deg);
}

.footer-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(43, 74, 103, 0.6);
}

.footer-list li + li {
  margin-top: 8px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-list a:hover {
  color: var(--neon-strike);
  padding-left: 4px;
}

.footer-contact-list li {
  display: flex;
  gap: 10px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-contact-list li + li {
  margin-top: 10px;
}

.footer-contact-label {
  color: var(--text-primary);
  font-weight: 500;
  flex-shrink: 0;
  min-width: 2em;
}

.footer-support {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed rgba(43, 74, 103, 0.5);
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid rgba(43, 74, 103, 0.5);
}

.footer-copy,
.footer-icp {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--ink-raised);
  border: 1px solid var(--line-border);
  color: var(--text-primary);
  font-size: 1.25rem;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.to-top:hover,
.to-top:focus-visible {
  border-color: var(--neon-strike);
  color: var(--neon-strike);
  transform: translateY(-2px);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 900;
    display: none;
    background: var(--ink-panel);
    border-bottom: 1px solid var(--line-border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px 20px 18px;
  }

  .nav-link {
    width: 100%;
    min-height: 48px;
    padding: 0 8px;
    border-bottom: 1px solid rgba(43, 74, 103, 0.4);
  }

  .nav-link::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .header-top {
    display: none;
  }

  .header-main-inner {
    min-height: 64px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: 0.9375rem;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-sub {
    font-size: 0.625rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-shell {
    padding-top: 48px;
  }

  .footer-trust {
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 20px;
  }

  .footer-trust p {
    font-size: 0.8125rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .grid-12 > * {
    grid-column: 1 / -1;
  }
}

@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;
  }

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