@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=Space+Mono:wght@400;700&display=swap');

:root {
  /* Colors */
  --color-acid-green: #C6FF00;
  --color-electric-blue: #2B3FFF;
  --color-intense-yellow: #FFD500;
  --color-off-white: #F5F5F0;
  --color-black: #111111;

  /* Typography */
  --font-heading: 'Archivo Black', sans-serif;
  --font-body: 'Space Mono', monospace;

  --text-display-size: 72px;
  --text-display-line-height: 0.9;
  --text-display-letter-spacing: -0.02em;
  --text-h1-size: 48px;
  --text-h1-line-height: 1.0;
  --text-h1-letter-spacing: -0.01em;
  --text-h2-size: 36px;
  --text-h2-line-height: 1.1;
  --text-h2-letter-spacing: -0.005em;
  --text-h3-size: 24px;
  --text-h3-line-height: 1.2;
  --text-h3-letter-spacing: 0;
  --text-body-size: 18px;
  --text-body-line-height: 1.5;
  --text-body-letter-spacing: 0;
  --text-small-size: 14px;
  --text-small-line-height: 1.4;
  --text-small-letter-spacing: 0.005em;

  /* Spacing */
  --space-4: 4px;
  --space-8: 8px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;
  --space-64: 64px;
  --space-96: 96px;

  /* Surfaces */
  --border-thickness: 2px;
  --border-thickness-heavy: 4px;
  --shadow-offset: 4px;
  --shadow-offset-hover: 6px;
  --shadow-offset-lg: 8px;
  --shadow-color: var(--color-black);
  --shadow-color-alt: var(--color-electric-blue);

  /* Containers */
  --container-max-width: 1280px;
  --container-padding: var(--space-32);
  --grid-gutter: var(--space-16);

  /* Transitions */
  --transition-fast: 100ms ease-out;
  --transition-medium: 200ms ease-out;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  letter-spacing: var(--text-body-letter-spacing);
  color: var(--color-black);
  background-color: var(--color-off-white);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

ul,
ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* Document Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-black);
}

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display-size);
  line-height: var(--text-display-line-height);
  letter-spacing: var(--text-display-letter-spacing);
  text-transform: uppercase;
  font-weight: 700;
}

h1 {
  font-size: var(--text-h1-size);
  line-height: var(--text-h1-line-height);
  letter-spacing: var(--text-h1-letter-spacing);
}

h2 {
  font-size: var(--text-h2-size);
  line-height: var(--text-h2-line-height);
  letter-spacing: var(--text-h2-letter-spacing);
}

h3 {
  font-size: var(--text-h3-size);
  line-height: var(--text-h3-line-height);
  letter-spacing: var(--text-h3-letter-spacing);
}

h4 {
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: 1.2;
  text-transform: uppercase;
  font-weight: 700;
}

p {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  line-height: var(--text-body-line-height);
  letter-spacing: var(--text-body-letter-spacing);
  color: var(--color-black);
}

small,
.text-small {
  font-size: var(--text-small-size);
  line-height: var(--text-small-line-height);
  letter-spacing: var(--text-small-letter-spacing);
}

/* Restore vertical rhythm for content elements */
h1, h2, h3, h4, h5, h6,
.display {
  margin-block-end: var(--space-16);
}

p {
  margin-block-end: var(--space-16);
}

ul:not([class]),
ol:not([class]) {
  margin-block-end: var(--space-16);
  padding-inline-start: var(--space-24);
}

ul:not([class]) {
  list-style: disc;
}

ol:not([class]) {
  list-style: decimal;
}

ul:not([class]) li,
ol:not([class]) li {
  margin-block-end: var(--space-8);
}

blockquote {
  margin-block-end: var(--space-16);
  padding-inline-start: var(--space-16);
  border-inline-start: var(--border-thickness-heavy) solid var(--color-black);
  font-style: italic;
}

/* Safe last-child handling */
h1:last-child,
h2:last-child,
h3:last-child,
h4:last-child,
h5:last-child,
h6:last-child,
.display:last-child,
p:last-child,
ul:last-child,
ol:last-child,
blockquote:last-child {
  margin-block-end: 0;
}

/* Links */
a {
  color: var(--color-electric-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-acid-green);
}

/* Focus */
:focus-visible {
  outline: var(--border-thickness) solid var(--color-intense-yellow);
  outline-offset: 2px;
}

/* Media defaults */
img {
  border: var(--border-thickness) solid var(--color-black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--shadow-color);
  filter: grayscale(100%);
  transition: filter var(--transition-medium), box-shadow var(--transition-fast), transform var(--transition-fast);
}

img:hover {
  filter: grayscale(100%) sepia(100%) hue-rotate(40deg) saturate(300%);
  box-shadow: var(--shadow-offset-hover) var(--shadow-offset-hover) 0 0 var(--shadow-color-alt);
}

/* Form defaults */
input,
textarea,
select {
  font-family: var(--font-body);
  font-size: var(--text-body-size);
  padding: var(--space-8) var(--space-16);
  border: var(--border-thickness) solid var(--color-black);
  background-color: var(--color-off-white);
  color: var(--color-black);
  border-radius: 0;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--color-acid-green);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--color-black);
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

label {
  font-family: var(--font-heading);
  font-size: var(--text-small-size);
  text-transform: uppercase;
  letter-spacing: var(--text-small-letter-spacing);
  display: block;
  margin-block-end: var(--space-4);
  color: var(--color-black);
}

/* Containers */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container-narrow {
  width: 100%;
  max-width: 800px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.container-wide {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* Surfaces */
.surface {
  background-color: var(--color-off-white);
  border: var(--border-thickness) solid var(--color-black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--shadow-color);
  padding: var(--space-24);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.surface:hover {
  box-shadow: var(--shadow-offset-hover) var(--shadow-offset-hover) 0 0 var(--shadow-color);
  transform: translate(-2px, -2px);
}

.surface:active {
  box-shadow: 0 0 0 0 var(--shadow-color);
  transform: translate(2px, 2px);
}

.surface-dark {
  background-color: var(--color-black);
  color: var(--color-off-white);
  border: var(--border-thickness) solid var(--color-off-white);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--color-off-white);
}

.surface-dark h1,
.surface-dark h2,
.surface-dark h3,
.surface-dark h4,
.surface-dark h5,
.surface-dark h6,
.surface-dark .display,
.surface-dark p,
.surface-dark a {
  color: var(--color-off-white);
}

.surface-accent {
  background-color: var(--color-acid-green);
  border: var(--border-thickness) solid var(--color-black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--color-black);
}

.surface-accent h1,
.surface-accent h2,
.surface-accent h3,
.surface-accent h4,
.surface-accent h5,
.surface-accent h6,
.surface-accent .display,
.surface-accent p {
  color: var(--color-black);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: var(--text-body-size);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
  padding: var(--space-16) var(--space-32);
  border: var(--border-thickness-heavy) solid var(--color-black);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--color-black);
  cursor: pointer;
  text-decoration: none;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast), background-color var(--transition-fast);
  line-height: 1;
  text-align: center;
}

.btn:hover {
  box-shadow: var(--shadow-offset-hover) var(--shadow-offset-hover) 0 0 var(--color-black);
  transform: translate(-2px, -2px);
}

.btn:active {
  box-shadow: 0 0 0 0 var(--color-black);
  transform: translate(2px, 2px);
}

.btn-primary {
  background-color: var(--color-acid-green);
  color: var(--color-black) !important;
}

.btn-primary:hover {
  background-color: var(--color-acid-green);
}

.btn-secondary {
  background-color: var(--color-electric-blue);
  color: var(--color-off-white);
  border-color: var(--color-off-white);
  box-shadow: var(--shadow-offset) var(--shadow-offset) 0 0 var(--color-off-white);
}

.btn-secondary:hover {
  box-shadow: var(--shadow-offset-hover) var(--shadow-offset-hover) 0 0 var(--color-off-white);
}

.btn-secondary:active {
  box-shadow: 0 0 0 0 var(--color-off-white);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-black);
}

.btn-small {
  font-size: var(--text-small-size);
  padding: var(--space-8) var(--space-16);
}

.btn-large {
  font-size: var(--text-h3-size);
  padding: var(--space-24) var(--space-48);
}

/* Grid primitive */
.grid-tiles {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gutter);
}

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

/* Flex utilities */
.flex {
  display: flex;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-col {
  flex-direction: column;
}

.flex-center {
  align-items: center;
  justify-content: center;
}

.flex-between {
  align-items: center;
  justify-content: space-between;
}

.flex-align-center {
  align-items: center;
}

.flex-align-start {
  align-items: flex-start;
}

.flex-align-end {
  align-items: flex-end;
}

.flex-justify-center {
  justify-content: center;
}

.flex-justify-between {
  justify-content: space-between;
}

.flex-justify-end {
  justify-content: flex-end;
}

.flex-grow {
  flex: 1 1 0%;
  min-width: 0;
}

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

/* Gap utilities */
.gap-4 { gap: var(--space-4); }
.gap-8 { gap: var(--space-8); }
.gap-16 { gap: var(--space-16); }
.gap-24 { gap: var(--space-24); }
.gap-32 { gap: var(--space-32); }
.gap-48 { gap: var(--space-48); }

/* Spacing utilities */
.mb-0 { margin-block-end: 0; }
.mb-8 { margin-block-end: var(--space-8); }
.mb-16 { margin-block-end: var(--space-16); }
.mb-24 { margin-block-end: var(--space-24); }
.mb-32 { margin-block-end: var(--space-32); }
.mb-48 { margin-block-end: var(--space-48); }

.mt-0 { margin-block-start: 0; }
.mt-8 { margin-block-start: var(--space-8); }
.mt-16 { margin-block-start: var(--space-16); }
.mt-24 { margin-block-start: var(--space-24); }
.mt-32 { margin-block-start: var(--space-32); }
.mt-48 { margin-block-start: var(--space-48); }

.p-0 { padding: 0; }
.p-16 { padding: var(--space-16); }
.p-24 { padding: var(--space-24); }
.p-32 { padding: var(--space-32); }
.p-48 { padding: var(--space-48); }

/* Visibility */
.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;
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --text-display-size: 48px;
    --text-h1-size: 36px;
    --text-h2-size: 28px;
    --text-h3-size: 20px;
    --text-body-size: 16px;
    --container-padding: var(--space-16);
    --grid-gutter: var(--space-8);
  }

  .display {
    font-size: var(--text-display-size);
  }

  h1 {
    font-size: var(--text-h1-size);
  }

  h2 {
    font-size: var(--text-h2-size);
  }

  h3 {
    font-size: var(--text-h3-size);
  }

  p {
    font-size: var(--text-body-size);
  }

  .grid-tiles {
    grid-template-columns: repeat(4, 1fr);
  }

  .btn-large {
    font-size: var(--text-h3-size);
    padding: var(--space-16) var(--space-32);
  }
}