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

:root {
  --color-bg: #0B0F1A;
  --color-bg-secondary: #12182B;
  --color-bg-elevated: #1E2A3A;
  --color-accent-blue: #00D4FF;
  --color-accent-green: #39FF14;
  --color-accent-gold: #FFD700;
  --color-text: #E6F1FF;
  --color-text-muted: #8A9BB5;
  --color-border: #1E2A3A;
  --font-heading: Impact, 'Arial Black', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Consolas, 'Courier New', monospace;
  --header-height: 72px;
  --container-width: 1280px;
  --container-padding: 24px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --border-radius: 4px;
  --shadow-card: 8px 8px 0 rgba(0, 0, 0, 0.35);
  --shadow-card-hover: 8px 8px 0 rgba(0, 212, 255, 0.18);
  --transition: 0.25s ease;
  --z-header: 1000;
  --z-progress: 1500;
  --z-skip: 2000;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(ellipse 60% 40% at 85% -10%, rgba(0, 212, 255, 0.08) 0%, transparent 100%),
    radial-gradient(ellipse 40% 30% at 10% 10%, rgba(57, 255, 20, 0.05) 0%, transparent 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

main {
  display: block;
  min-height: 60vh;
}

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

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

h1 { font-size: 54px; }
h2 { font-size: 34px; }
h3 { font-size: 24px; }
h4 { font-size: 18px; }

p {
  margin-bottom: 1em;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.text-mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-green) 70%, var(--color-accent-gold));
  z-index: var(--z-progress);
  pointer-events: none;
  transition: width 0.1s linear;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-skip);
  display: inline-block;
  padding: 12px 28px;
  background: var(--color-accent-blue);
  color: var(--color-bg);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  border-radius: 0 0 8px 0;
  transform: translateY(-120%);
  transition: transform 0.2s ease;
}

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

.skip-link:hover {
  background: var(--color-accent-green);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: transparent;
  border-bottom: 2px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  background: rgba(11, 15, 26, 0.95);
  border-bottom-color: var(--color-border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.site-header__inner {
  max-width: var(--container-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 40px;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-accent-blue);
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent-blue);
  line-height: 1;
  letter-spacing: 0.02em;
  box-shadow: 4px 4px 0 rgba(0, 212, 255, 0.15);
  transition: border-color 0.25s, box-shadow 0.25s, color 0.25s;
}

.site-brand:hover .site-brand__mark {
  border-color: var(--color-accent-green);
  color: var(--color-accent-green);
  box-shadow: 4px 4px 0 rgba(57, 255, 20, 0.15);
}

.site-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.site-brand__name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.site-brand__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  position: relative;
  display: block;
  padding: 8px 15px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.25s;
  white-space: nowrap;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 3px;
  left: 15px;
  right: 15px;
  height: 2px;
  background: var(--color-accent-blue);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.site-nav__link:hover::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-accent-green);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
}

.site-nav__link[aria-current="page"]::after {
  background: var(--color-accent-green);
  transform: scaleX(1);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn--primary {
  background: var(--color-accent-blue);
  color: var(--color-bg);
  border-color: var(--color-accent-blue);
  box-shadow: 4px 4px 0 rgba(0, 212, 255, 0.25);
}

.btn--primary:hover {
  background: transparent;
  color: var(--color-accent-blue);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 212, 255, 0.35);
}

.btn--primary:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 rgba(0, 212, 255, 0.25);
}

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

.btn--ghost:hover {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--color-accent-green);
  color: var(--color-accent-green);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(57, 255, 20, 0.2);
}

.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-bg-secondary);
  transition: border-color 0.25s, background 0.25s;
}

.mobile-nav-toggle:hover {
  border-color: var(--color-accent-blue);
}

.mobile-nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-accent-blue);
  border-radius: 2px;
  transition: transform 0.3s ease, width 0.3s ease, background 0.25s;
}

.mobile-nav-toggle:hover .mobile-nav-toggle__bar {
  background: var(--color-accent-green);
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-footer {
  position: relative;
  background: var(--color-bg-secondary);
  border-top: 2px solid var(--color-border);
  margin-top: auto;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-blue) 0%, var(--color-accent-green) 40%, var(--color-accent-gold) 100%);
}

.site-footer__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-padding) 24px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.site-brand--footer .site-brand__mark {
  width: 56px;
  height: 44px;
  font-size: 22px;
  border-color: var(--color-border);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.4);
}

.site-brand--footer .site-brand__name {
  color: var(--color-text);
}

.site-footer__trust {
  max-width: 320px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0;
  padding-left: 16px;
  border-left: 3px solid var(--color-accent-gold);
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.site-footer__title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent-green);
  letter-spacing: 0.12em;
  margin-bottom: 6px;
  text-transform: uppercase;
  position: relative;
}

.site-footer__title::after {
  content: '';
  display: block;
  width: 32px;
  height: 2px;
  background: var(--color-accent-blue);
  margin-top: 6px;
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__links a {
  display: inline-block;
  font-size: 14px;
  color: var(--color-text);
  transition: color 0.2s, transform 0.2s;
}

.site-footer__links a:hover {
  color: var(--color-accent-blue);
  transform: translateX(4px);
}

.site-footer__contact {
  gap: 8px;
}

.site-footer__contact-line {
  font-size: 14px;
  color: var(--color-text);
  margin: 0;
  padding: 6px 0 6px 14px;
  border-left: 2px solid var(--color-border);
  transition: border-color 0.25s;
}

.site-footer__contact-line:hover {
  border-left-color: var(--color-accent-blue);
}

.site-footer__contact-note {
  margin-top: 10px;
  padding: 10px 12px;
  background: rgba(0, 212, 255, 0.06);
  border: 1px dashed var(--color-accent-blue);
  border-radius: var(--border-radius);
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-text-muted);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 20px;
  border-top: 2px solid var(--color-border);
}

.site-footer__copyright {
  font-size: 13px;
  color: var(--color-text-muted);
  margin: 0;
}

.site-footer__icp {
  font-size: 13px;
}

.site-footer__icp a {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  transition: color 0.2s;
}

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

.section {
  padding: var(--space-6) 0;
}

.section__head {
  max-width: var(--container-width);
  margin: 0 auto var(--space-5);
  padding: 0 var(--container-padding);
}

.section__title {
  font-size: 36px;
  margin-bottom: 12px;
  position: relative;
  display: inline-block;
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-green));
}

.section__desc {
  max-width: 640px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--color-bg-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
  border-color: var(--color-accent-blue);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card--green:hover {
  border-color: var(--color-accent-green);
  box-shadow: 8px 8px 0 rgba(57, 255, 20, 0.15);
}

.card--gold:hover {
  border-color: var(--color-accent-gold);
  box-shadow: 8px 8px 0 rgba(255, 215, 0, 0.12);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border);
}

.breadcrumb a {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

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

.breadcrumb a[aria-current="page"] {
  color: var(--color-accent-green);
  font-weight: 600;
}

.breadcrumb__sep {
  color: var(--color-border);
  user-select: none;
}

.figure {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-elevated);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  min-height: 200px;
}

.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.figure:hover img {
  transform: scale(1.03);
}

.figure__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text);
  background: rgba(11, 15, 26, 0.85);
  border-top: 1px solid var(--color-border);
}

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

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

[data-nav] {
  transform-origin: top center;
}

@media (max-width: 900px) {
  .site-brand__tagline {
    display: none;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    background: rgba(11, 15, 26, 0.98);
    border-bottom: 2px solid var(--color-accent-blue);
    padding: 16px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link {
    padding: 14px 16px;
    font-size: 16px;
    border-left: 3px solid transparent;
  }

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

  .site-nav__link:hover {
    background: rgba(0, 212, 255, 0.05);
    border-left-color: var(--color-accent-blue);
  }

  .site-nav__link[aria-current="page"] {
    background: rgba(57, 255, 20, 0.06);
    border-left-color: var(--color-accent-green);
    font-family: var(--font-body);
    font-size: 16px;
  }

  .site-header__cta {
    padding: 8px 18px;
    font-size: 13px;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 64px;
  }

  .site-header__inner {
    padding: 0 16px;
    gap: 12px;
  }

  .site-brand__mark {
    width: 44px;
    height: 34px;
    font-size: 17px;
  }

  .site-brand__name {
    font-size: 17px;
  }

  .site-brand__tagline {
    display: none;
  }

  .site-header__cta {
    display: none;
  }

  .site-nav {
    top: 64px;
  }

  .site-footer__inner {
    padding: 40px 16px 20px;
  }

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

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

  .section {
    padding: 40px 0;
  }

  .section__title {
    font-size: 28px;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 26px;
  }

  h3 {
    font-size: 20px;
  }

  .card {
    padding: 18px;
  }
}

@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 {
    background: rgba(11, 15, 26, 0.95);
    border-bottom-color: var(--color-border);
  }

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

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