@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-cyrillic-ext.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-italic-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-italic-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-italic-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-400-italic-cyrillic-ext.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-500-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-500-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-500-cyrillic.woff2') format('woff2');
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}

@font-face {
  font-family: 'IBM Plex Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/fonts/ibm-plex-mono-500-cyrillic-ext.woff2') format('woff2');
  unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}

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

:root {
  --bg: #f5f4f0;
  --fg: #111;
  --muted: #6e6a60;
  --rule: #d4d2cc;
  --badge-bg: #e8e6e0;
  --badge-bg-hover: #dedad2;
}

html {
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'IBM Plex Mono', monospace;
  line-height: 1.7;
  padding: 4rem 1.5rem 6rem;
  max-width: 640px;
  margin: 0 auto;
  overflow-x: hidden;
}

header {
  margin-bottom: 3.5rem;
}

.topline {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lang {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.lang a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}

.lang a:hover {
  border-bottom-color: var(--fg);
}

.lang [aria-current],
.lang .sep {
  color: var(--muted);
}

.lang .sep {
  margin: 0 0.4rem;
}

.preamble {
  font-size: 0.875rem;
  color: var(--fg);
  line-height: 1.8;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

ol {
  list-style: none;
}

ol li {
  margin-bottom: 2rem;
}

.rule-title {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.rule-number {
  font-style: italic;
  font-weight: 400;
  margin-right: 0.6rem;
}

.rule-body {
  font-size: 0.875rem;
  line-height: 1.8;
}

footer {
  margin-top: 3.5rem;
  font-size: 0.75rem;
  color: var(--muted);
  font-style: italic;
}

.badge-section {
  margin-top: 3rem;
}

.badge-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.badge-code {
  font: inherit;
  font-size: 0.75rem;
  color: var(--fg);
  background: var(--badge-bg);
  border: none;
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.75rem 1rem;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  cursor: pointer;
  transition: background 0.15s;
}

.badge-code:hover {
  background: var(--badge-bg-hover);
}

.badge-code:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.copy-hint {
  font-size: 0.7rem;
  color: var(--muted);
  margin-top: 0.4rem;
  font-style: italic;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141412;
    --fg: #e8e6e0;
    --muted: #8a857a;
    --rule: #2a2926;
    --badge-bg: #1e1d1a;
    --badge-bg-hover: #252320;
  }
}

@media (max-width: 480px) {
  body {
    padding: 2.5rem 1.25rem 4rem;
  }
}