/* ==========================================================================
   base.css — typefaces, tokens, and reset shared by the homepage and the
   article pages. Linked alongside harvard.css (homepage) or article.css.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Spectral — Production Type, Paris. Self-hosted, latin + latin-ext.
   -------------------------------------------------------------------------- */

@font-face {
  font-family: 'Spectral';
  font-style: normal;
  font-weight: 200;
  font-display: swap;
  src: url(fonts/spectral-200-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: 'Spectral';
  font-style: normal;
  font-weight: 200;
  font-display: swap;
  src: url(fonts/spectral-200-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: 'Spectral';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/spectral-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: 'Spectral';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/spectral-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: 'Spectral';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/spectral-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: 'Spectral';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/spectral-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: 'Spectral';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/spectral-600-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: 'Spectral';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/spectral-600-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;
}

/* Real small caps — the typographic device of scholarly apparatus. */
@font-face {
  font-family: 'Spectral SC';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/spectralsc-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: 'Spectral SC';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/spectralsc-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;
}

/* --------------------------------------------------------------------------
   Tokens
   -------------------------------------------------------------------------- */

:root {
  --paper: #fbf8f2;
  --surface: #f3eee3;
  --ink: #1b2a4a;
  --ink-muted: #5b6880;
  --vermilion: #c8402f;
  --rule: #d9d0bf;

  --serif: 'Spectral', 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia,
    'Times New Roman', serif;
  --smallcaps: 'Spectral SC', 'Spectral', Palatino, Georgia, serif;

  /* A spread has one fold. Half of it belongs to each page. */
  --gutter: 4.5rem;
  --measure: 34rem;
  --page-max: 78rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141a26;
    --surface: #1b2331;
    --ink: #e8e3d8;
    --ink-muted: #9aa5b8;
    --vermilion: #e2614e;
    --rule: #2c3547;
  }
}

/* --------------------------------------------------------------------------
   Reset and shared defaults
   -------------------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 140ms ease, text-decoration-color 140ms ease;
}

a:hover {
  color: var(--vermilion);
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
}

/* Reachable by keyboard, out of the way otherwise. */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--paper);
  color: var(--ink);
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--vermilion);
  font-family: var(--smallcaps);
  letter-spacing: 0.06em;
  z-index: 10;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}