:root {
  --bg-base: #0B0E14;
  --bg-surface: #131822;
  --text-primary: #E5E9F0;
  --text-secondary: #7A889B;
  --accent-neon: #00FF87;
  --border-grid: #1E2A38;
  --overlay-dark: #0B0E14;
  --font-heading: "JetBrains Mono", "Fira Code", monospace;
  --font-body: "Fira Code", "JetBrains Mono", monospace;
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  --radius-none: 0;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-full: 9999px;
  --shadow-elevation: 0 2px 8px rgba(0, 0, 0, 0.5);
  --container-max: 1200px;
  --transition-fast: 0.2s ease;
  --grid-line: rgba(30, 42, 56, 0.35);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 400;
  color: var(--text-primary);
  background-color: var(--bg-base);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  min-height: 100vh;
  overflow-x: hidden;
  overflow-wrap: break-word;
  word-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  line-height: 1.3;
  margin-block-end: var(--space-4);
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2rem);
  line-height: 1.3;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.5rem);
  line-height: 1.4;
}

h3 {
  font-size: clamp(1.15rem, 2.5vw, 1.25rem);
  line-height: 1.5;
}

h4 {
  font-size: 1rem;
  line-height: 1.6;
}

h5 {
  font-size: 0.875rem;
  line-height: 1.5;
}

h6 {
  font-size: 0.75rem;
  line-height: 1.4;
}

p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin-block-end: var(--space-4);
}

ul, ol {
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-6);
}

ul {
  list-style-type: square;
}

ol {
  list-style-type: decimal;
}

blockquote {
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-4);
  border-inline-start: 2px solid var(--accent-neon);
  color: var(--text-secondary);
  font-style: italic;
}

figure {
  margin-block-end: var(--space-4);
}

figcaption {
  font-size: 0.75rem;
  line-height: 1.4;
  color: var(--text-secondary);
  margin-block-start: var(--space-2);
}

a {
  color: var(--accent-neon);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

a:hover {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--accent-neon);
  text-underline-offset: 0.2em;
}

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

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

img {
  object-fit: cover;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  text-align: inherit;
}

input, select, textarea {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-grid);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input::placeholder, textarea::placeholder {
  color: var(--text-secondary);
  opacity: 1;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-neon);
  box-shadow: 0 0 0 1px var(--accent-neon);
}

textarea {
  resize: vertical;
  min-height: 6rem;
}

label {
  display: inline-block;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-secondary);
  margin-block-end: var(--space-2);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-block-end: var(--space-4);
}

th, td {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-grid);
  text-align: start;
  vertical-align: top;
}

th {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.875rem;
  color: var(--text-secondary);
  background-color: var(--bg-surface);
}

hr {
  border: none;
  border-block-start: 1px solid var(--border-grid);
  margin-block: var(--space-8);
}

code, pre, kbd, samp {
  font-family: var(--font-body);
  font-size: 0.875rem;
}

code {
  background-color: var(--bg-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-grid);
}

pre {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-grid);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
  margin-block-end: var(--space-4);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.surface {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-grid);
  border-radius: var(--radius-sm);
  padding: var(--space-6);
  box-shadow: var(--shadow-elevation);
}

.surface > :last-child {
  margin-block-end: 0;
}

.flex {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.flex > * {
  min-width: 0;
  flex-shrink: 1;
}

.flex-row {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.flex-row > * {
  min-width: 0;
  flex-shrink: 1;
}

.flex-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.flex-column > * {
  min-width: 0;
  flex-shrink: 1;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.flex-center > * {
  min-width: 0;
  flex-shrink: 1;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.flex-between > * {
  min-width: 0;
  flex-shrink: 1;
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: var(--space-4);
}

.grid-auto > * {
  min-width: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.875rem;
  line-height: 1.5;
  padding: var(--space-3) var(--space-6);
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-grid);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  border-color: var(--accent-neon);
  color: var(--accent-neon);
  box-shadow: 0 0 8px rgba(0, 255, 135, 0.25);
}

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

.btn:active {
  background-color: var(--accent-neon);
  color: var(--bg-base);
  border-color: var(--accent-neon);
}

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

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent-neon);
  border-color: var(--accent-neon);
  box-shadow: 0 0 8px rgba(0, 255, 135, 0.25);
}

.btn-primary:active {
  background-color: var(--text-primary);
  color: var(--bg-base);
  border-color: var(--text-primary);
}

.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  background-color: var(--accent-neon);
  color: var(--bg-base);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

@media (max-width: 768px) {
  .container {
    padding-inline: var(--space-3);
  }

  .surface {
    padding: var(--space-4);
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.125rem;
  }

  p, body {
    font-size: 0.9375rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-2);
  }

  .surface {
    padding: var(--space-3);
  }

  h1 {
    font-size: 1.375rem;
  }

  h2 {
    font-size: 1.125rem;
  }

  h3 {
    font-size: 1rem;
  }

  .flex-row, .flex-between, .flex-center {
    flex-direction: column;
    align-items: stretch;
  }
}