/* IBM Plex Serif */
@font-face {
  font-family: 'IBM Plex Serif';
  src: url('/assets/fonts/ibm-plex-serif/IBMPlexSerif-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Serif';
  src: url('/assets/fonts/ibm-plex-serif/IBMPlexSerif-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Serif';
  src: url('/assets/fonts/ibm-plex-serif/IBMPlexSerif-SemiBold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Serif';
  src: url('/assets/fonts/ibm-plex-serif/IBMPlexSerif-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Serif';
  src: url('/assets/fonts/ibm-plex-serif/IBMPlexSerif-Italic.woff2') format('woff2');
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Mono';
  src: url('/assets/fonts/ibm-plex-mono/IBMPlexMono-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Mono';
  src: url('/assets/fonts/ibm-plex-mono/IBMPlexMono-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'IBM Plex Mono';
  src: url('/assets/fonts/ibm-plex-mono/IBMPlexMono-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

html {
  font-size: 16px;
  box-sizing: border-box;
  height: 100%;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: var(--font-serif);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100%;
  counter-reset: card-counter section-counter fig-counter;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 40px 40px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: var(--font-weight-medium);
  line-height: 1.1;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--text-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

h2 {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-bold);
}

h3 {
  font-size: var(--text-2xl);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

h4 {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
}

h5 {
  font-size: var(--text-base);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-border);
  display: inline-block;
  padding-bottom: 2px;
}

h6 {
  font-size: var(--text-xs);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

p {
  margin-bottom: var(--space-sm);
  max-width: 65ch;
  font-size: var(--text-base);
}

a {
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

strong, b {
  font-weight: var(--font-weight-bold);
  font-family: var(--font-mono);
}

em, i {
  font-style: italic;
  color: var(--color-muted);
}

ul {
  list-style: none;
  padding-left: 0;
}

li {
  margin-bottom: 0.5em;
}

blockquote {
  border-left: 2px solid var(--color-accent);
  padding-left: var(--space-md);
  margin: var(--space-md) 0;
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--color-text);
  background: var(--color-surface);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  border-left-width: 4px;
}

code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.2em 0.4em;
}

pre {
  padding: var(--space-sm);
  overflow-x: auto;
  margin-bottom: var(--space-sm);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--color-border);
}

::selection {
  background-color: var(--color-accent);
  color: #fff;
}

.label-technical {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-surface);
  background: var(--color-text);
  padding: 2px 6px;
  display: inline-block;
}

.section-header {
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.caption {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-muted);
  margin-top: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-left: 1px solid var(--color-accent);
  padding-left: var(--space-xs);
}