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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -moz-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: #0A0F1A;
  color: #C0C6D9;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

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

:focus-visible {
  outline: 2px solid #00D4FF;
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

:root {
  --color-electric-blue: #00D4FF;
  --color-fluo-green: #39FF14;
  --color-dark-night: #0A0F1A;
  --color-metal-silver: #C0C6D9;
  --color-neon-purple: #9B30FF;
  --color-white: #FFFFFF;
  --color-deep-gray: #1A1F2E;
  --color-accent-blue-dark: #0066CC;
  --font-heading: 700 1.4em/1.1 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-body: 400 1em/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-data: 500 1.1em/1.2 "SF Mono", "Cascadia Code", "JetBrains Mono", "Fira Code", monospace;
  --site-max-width: 1200px;
  --header-height: 72px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --border-radius: 6px;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(10, 15, 26, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid #1A1F2E;
  z-index: 1000;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: #39FF14;
  color: #0A0F1A;
  padding: 0.5rem 1rem;
  font-weight: 700;
  z-index: 1001;
  transition: top 0.2s;
}

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

.header-inner {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  position: relative;
}

.brand-group {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-sm);
}

.brand-logo {
  font: var(--font-heading);
  font-size: 1.6rem;
  color: var(--color-electric-blue);
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-metal-silver);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  display: none;
}

@media (min-width: 640px) {
  .brand-tagline {
    display: inline;
  }
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 28px;
  height: 24px;
  padding: 0;
  z-index: 1002;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: #C0C6D9;
  transition: transform 0.25s, opacity 0.25s;
}

[data-open] .nav-toggle-line:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

[data-open] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

[data-open] .nav-toggle-line:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

[data-nav] {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: 0;
  overflow: hidden;
  background: rgba(10, 15, 26, 0.98);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: height 0.3s ease;
  border-bottom: 1px solid #1A1F2E;
}

[data-nav][data-open] {
  height: auto;
  min-height: 260px;
}

.nav-list {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg) var(--spacing-md);
  gap: var(--spacing-sm);
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-metal-silver);
  letter-spacing: 0.04em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-electric-blue);
}

.nav-link[aria-current="page"] {
  color: var(--color-electric-blue);
  border-bottom-color: var(--color-electric-blue);
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  [data-nav] {
    position: static;
    height: auto !important;
    min-height: unset;
    background: transparent;
    backdrop-filter: none;
    border-bottom: none;
    width: auto;
  }

  .nav-list {
    flex-direction: row;
    padding: 0;
    gap: var(--spacing-md);
  }

  .nav-link {
    font-size: 0.9rem;
    padding: 0.25rem 0;
  }
}

/* ===== Footer ===== */
.site-footer {
  background: #0A0F1A;
  border-top: 1px solid #1A1F2E;
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.footer-inner {
  max-width: var(--site-max-width);
  margin: 0 auto;
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid #1A1F2E;
}

.footer-brand {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-sm);
}

.footer-brand .brand-logo {
  font-size: 1.3rem;
}

.footer-brand .brand-tagline {
  display: inline;
  font-size: 0.7rem;
}

.footer-trust {
  font-size: 0.85rem;
  color: var(--color-neon-purple);
  border-left: 3px solid var(--color-neon-purple);
  padding-left: var(--spacing-sm);
  max-width: 480px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-metal-silver);
  transition: color 0.2s;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--color-fluo-green);
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  font-size: 0.8rem;
  color: var(--color-metal-silver);
  opacity: 0.75;
}

.footer-contact {
  line-height: 1.5;
}

.footer-icp {
  color: var(--color-metal-silver);
}

.footer-copy {
  margin-top: var(--spacing-xs);
}

/* ===== Shared Utilities ===== */
.main-content {
  min-height: 80vh;
  padding-top: calc(var(--header-height) + var(--spacing-lg));
  padding-bottom: var(--spacing-xl);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  font-size: 0.85rem;
  color: var(--color-metal-silver);
  margin-bottom: var(--spacing-md);
}

.breadcrumb > * + *::before {
  content: ">";
  margin-right: var(--spacing-xs);
  color: var(--color-metal-silver);
  opacity: 0.5;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.6rem 1.2rem;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-electric-blue);
  border: 1px solid var(--color-electric-blue);
  background: transparent;
  border-radius: var(--border-radius);
  transition: background 0.2s, color 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.btn:hover,
.btn:focus-visible {
  background: var(--color-electric-blue);
  color: #0A0F1A;
}

.grid-card {
  background: var(--color-deep-gray);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  border: 1px solid #2A2F3E;
  transition: border-color 0.2s;
}

.grid-card:hover {
  border-color: var(--color-electric-blue);
}

.split-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .split-layout {
    grid-template-columns: 7fr 5fr;
  }
}

.data-value {
  font: var(--font-data);
  color: var(--color-electric-blue);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-fluo-green);
  margin-bottom: var(--spacing-sm);
}

.section-label::before {
  content: "//";
  color: var(--color-neon-purple);
}

.bracket-box {
  padding: var(--spacing-md);
  border: 1px solid #2A2F3E;
  border-radius: var(--border-radius);
  position: relative;
}

.bracket-box::before,
.bracket-box::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--color-electric-blue);
  border-style: solid;
}

.bracket-box::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}

.bracket-box::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

.scan-line {
  position: relative;
  overflow: hidden;
}

.scan-line::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #39FF14, transparent);
  opacity: 0.15;
  animation: scanMove 4s linear infinite;
}

@keyframes scanMove {
  0% { top: 0; }
  100% { top: 100%; }
}

/* ===== Scroll Progress ===== */
[data-scroll-progress] {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #00D4FF, #9B30FF);
  z-index: 999;
  pointer-events: none;
  transition: width 0.1s linear;
}

@media (prefers-reduced-motion: reduce) {
  [data-scroll-progress] {
    display: none;
  }
}

/* ===== Section Reveal ===== */
[data-section-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  [data-section-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ===== Tabs ===== */
[data-tab-panel] {
  display: none;
}

[data-tab-panel][data-active] {
  display: block;
}

[data-tab-nav] {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

[data-tab-nav] button {
  padding: 0.4rem 0.8rem;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-metal-silver);
  border: 1px solid #2A2F3E;
  border-radius: var(--border-radius);
  background: transparent;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

[data-tab-nav] button[aria-selected="true"] {
  background: #00D4FF;
  color: #0A0F1A;
  border-color: #00D4FF;
}

[data-tab-nav] button:hover,
[data-tab-nav] button:focus-visible {
  border-color: #00D4FF;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  :root {
    --header-height: 60px;
    --spacing-lg: 1.2rem;
    --spacing-xl: 2.5rem;
  }
  .brand-logo {
    font-size: 1.2rem;
  }
}