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

:root {
  --color-bg: #0A0E17;
  --color-bg-secondary: #131B2A;
  --color-accent-purple: #7B2FFF;
  --color-accent-green: #00FF87;
  --color-accent-orange: #FF6B1A;
  --color-text: #FFFFFF;
  --color-text-dim: #A0A8B8;
  --font-sans: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", monospace;
  --max-width: 1200px;
  --radius: 16px;
  --transition-duration: 0.3s;
  --transition-ease: ease;
}

html {
  scroll-behavior: smooth;
}

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

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

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-duration) var(--transition-ease);
}

a:hover {
  opacity: 0.85;
}

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

.container {
  width: min(100% - 2.5rem, var(--max-width));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--color-accent-orange);
  color: var(--color-bg);
  padding: 0.75rem 1.5rem;
  border-radius: 0 0 var(--radius) 0;
  font-weight: 700;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(10, 14, 23, 0.9) 100%);
  border-bottom: 1px solid rgba(123, 47, 255, 0.4);
  position: relative;
  z-index: 100;
}

.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-purple), var(--color-accent-green), var(--color-accent-orange));
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  transform: scaleX(0.15);
  transform-origin: left;
  animation: scanline 6s ease-in-out infinite alternate;
}

@keyframes scanline {
  from { transform: scaleX(0.15); }
  to { transform: scaleX(1); }
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-name {
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.2;
  text-transform: uppercase;
}

.brand-version {
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-green));
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-text-dim);
  border-radius: var(--radius);
  color: var(--color-text);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  cursor: pointer;
  align-items: center;
  gap: 0.5rem;
}

.nav-toggle-icon {
  width: 1.5rem;
  height: 1.5rem;
  display: inline-block;
  position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  top: 50%;
  transform: translateY(-50%);
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  box-shadow: none;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  box-shadow: none;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  justify-content: center;
}

.nav-link {
  display: block;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-dim);
  transition: color var(--transition-duration) var(--transition-ease), background var(--transition-duration) var(--transition-ease);
}

.nav-link:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link[aria-current="page"] {
  color: var(--color-bg);
  background: var(--color-accent-orange);
  font-weight: 700;
}

.main-content {
  flex: 1;
}

.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid rgba(0, 255, 135, 0.3);
  margin-top: auto;
  position: relative;
}

.site-footer::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent-purple));
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
}

.footer-inner {
  padding-block: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 2rem;
}

.footer-col .brand-name {
  font-size: 1.25rem;
}

.footer-trust {
  margin-top: 0.75rem;
  color: var(--color-text-dim);
  font-size: 0.875rem;
  max-width: 32ch;
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.footer-list {
  list-style: none;
  display: grid;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-dim);
}

.footer-list a {
  color: var(--color-text-dim);
}

.footer-list a:hover {
  color: var(--color-accent-green);
}

.footer-bottom {
  border-top: 1px solid rgba(160, 168, 184, 0.2);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-dim);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition-duration) var(--transition-ease), box-shadow var(--transition-duration) var(--transition-ease), background var(--transition-duration) var(--transition-ease);
}

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

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

.btn-primary:hover {
  background: #ff8534;
  box-shadow: 0 4px 16px rgba(255, 107, 26, 0.4);
}

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-dim);
  padding-block: 1rem;
}

.breadcrumbs a {
  color: var(--color-accent-green);
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.breadcrumbs span {
  margin-inline: 0.5rem;
}

.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(3, 1fr);
}

.image-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-green));
  aspect-ratio: 16 / 9;
}

.image-container::after {
  content: "图像待补充";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: rgba(10, 14, 23, 0.8);
  font-weight: 700;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

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

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

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

  .btn,
  .btn-primary,
  .nav-link,
  .skip-link,
  .footer-list a {
    transition: none;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: inline-flex;
  }

  .nav {
    width: 100%;
    display: none;
  }

  .nav[data-open="true"] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 0.25rem;
  }

  .nav-link {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 1.25rem;
  }

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

  .header-inner {
    padding-block: 0.75rem;
  }

  .container {
    width: min(100% - 1rem, var(--max-width));
  }

  .footer-inner {
    padding-block: 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }
}