@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono&family=IBM+Plex+Sans:wght@400;600;700&family=IBM+Plex+Serif:ital,wght@0,400;0,700;1,400&display=swap');

:root {
  --brand-hue: 10;
  --brand: hsl(var(--brand-hue), 70%, 50%);
  --brand-light: hsl(var(--brand-hue), 70%, 95%);
  --brand-dark: hsl(var(--brand-hue), 70%, 35%);
  --code-bg: hsl(var(--brand-hue), 10%, 96%);
  --text: #111;
  --text-muted: #555;
  --bg: hsl(var(--brand-hue), 20%, 99%);
  --surface: white;
  --border: hsl(var(--brand-hue), 20%, 88%);
  --border-light: hsl(var(--brand-hue), 20%, 90%);
  --shadow: hsl(var(--brand-hue), 20%, 80%);
}

[data-theme="dark"] {
  --brand: hsl(var(--brand-hue), 80%, 60%);
  --brand-light: hsl(var(--brand-hue), 30%, 15%);
  --brand-dark: hsl(var(--brand-hue), 80%, 70%);
  --code-bg: hsl(var(--brand-hue), 10%, 18%);
  --text: #e0e0e0;
  --text-muted: #999;
  --bg: hsl(var(--brand-hue), 10%, 10%);
  --surface: hsl(var(--brand-hue), 10%, 14%);
  --border: hsl(var(--brand-hue), 10%, 22%);
  --border-light: hsl(var(--brand-hue), 10%, 20%);
  --shadow: hsl(var(--brand-hue), 10%, 5%);
}

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

body {
  font-family: "IBM Plex Serif", serif;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 3vw, 2rem);
  color: var(--text);
  background-color: var(--bg);
}

header {
  border-bottom: 3px solid var(--brand);
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
}

header div { flex: 1; }

header h1 {
  font-family: "IBM Plex Sans", sans-serif;
  font-weight: 700;
  font-size: 2rem;
  color: var(--brand-dark);
}

header p {
  color: var(--text-muted);
  font-style: italic;
}

nav {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

nav a {
  color: var(--brand);
  text-decoration: none;
  margin-right: 1rem;
}

nav a:hover {
  text-decoration: underline;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--text);
  margin-top: 0.25rem;
}

.theme-toggle:hover {
  border-color: var(--brand);
}

h1, h2, h3 {
  font-family: "IBM Plex Sans", sans-serif;
}

h2 {
  font-size: 1.5rem;
  color: var(--brand-dark);
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  text-decoration: underline;
}

/* Step overview cards on homepage */
.steps {
  display: grid;
  gap: 1rem;
  margin: 2rem 0;
}

.step-card {
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand);
  padding: 1rem 1.25rem;
  border-radius: 0 0.5rem 0.5rem 0;
  background: var(--surface);
  transition: box-shadow 0.15s;
}

.step-card:hover {
  box-shadow: 0 2px 8px var(--shadow);
}

.step-card a {
  text-decoration: none;
  color: inherit;
  display: block;
}

.step-number {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  color: var(--brand);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

main > .step-number {
  font-size: 1.1rem;
  display: block;
  margin-bottom: 0.25rem;
}

.step-card h3 {
  margin-top: 0.25rem;
  margin-bottom: 0.25rem;
}

.step-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* Code blocks */
pre {
  border-radius: 0.5rem;
  padding: 1rem;
  overflow-x: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 1rem 0;
}

code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.15em 0.3em;
  border-radius: 0.25rem;
}

pre code {
  background: none;
  padding: 0;
}

/* Karpathy's code: explicitly marked with .karpathy wrapper */
.karpathy {
  position: relative;
}

.karpathy .codehilite {
  border-left: 4px solid var(--brand);
  border-radius: 0 0.5rem 0.5rem 0;
}

.karpathy .codehilite pre {
  font-size: 1rem;
}

.karpathy[data-lines]::before {
  content: "train0.py:" attr(data-lines);
  position: absolute;
  top: 0;
  right: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--border-light);
  padding: 0.15em 0.5em;
  border-radius: 0 0.5rem 0 0.3rem;
}

/* Pygments syntax highlighting — light mode (colorful) */
.codehilite .hll { background-color: #ffffcc }
.codehilite { background: var(--code-bg); color: #111 }
.codehilite .c { color: #888 }
.codehilite .err { color: #F00; background-color: #FAA }
.codehilite .k { color: #080; font-weight: bold }
.codehilite .o { color: #333 }
.codehilite .ch { color: #888 }
.codehilite .cm { color: #888 }
.codehilite .cp { color: #579 }
.codehilite .cpf { color: #888 }
.codehilite .c1 { color: #888 }
.codehilite .cs { color: #C00; font-weight: bold }
.codehilite .gd { color: #A00000 }
.codehilite .ge { font-style: italic }
.codehilite .gr { color: #F00 }
.codehilite .gh { color: #000080; font-weight: bold }
.codehilite .gi { color: #00A000 }
.codehilite .go { color: #888 }
.codehilite .gp { color: #C65D09; font-weight: bold }
.codehilite .gs { font-weight: bold }
.codehilite .gu { color: #800080; font-weight: bold }
.codehilite .gt { color: #04D }
.codehilite .kc { color: #080; font-weight: bold }
.codehilite .kd { color: #080; font-weight: bold }
.codehilite .kn { color: #080; font-weight: bold }
.codehilite .kp { color: #038; font-weight: bold }
.codehilite .kr { color: #080; font-weight: bold }
.codehilite .kt { color: #339; font-weight: bold }
.codehilite .m { color: #60E; font-weight: bold }
.codehilite .s { color: #D20 }
.codehilite .na { color: #00C }
.codehilite .nb { color: #007020 }
.codehilite .nc { color: #B06; font-weight: bold }
.codehilite .no { color: #036; font-weight: bold }
.codehilite .nd { color: #555; font-weight: bold }
.codehilite .ni { color: #800; font-weight: bold }
.codehilite .ne { color: #F00; font-weight: bold }
.codehilite .nf { color: #06B; font-weight: bold }
.codehilite .nl { color: #970; font-weight: bold }
.codehilite .nn { color: #0E84B5; font-weight: bold }
.codehilite .nt { color: #070 }
.codehilite .nv { color: #963 }
.codehilite .ow { color: #000; font-weight: bold }
.codehilite .w { color: #BBB }
.codehilite .mb { color: #60E; font-weight: bold }
.codehilite .mf { color: #60E; font-weight: bold }
.codehilite .mh { color: #058; font-weight: bold }
.codehilite .mi { color: #00D; font-weight: bold }
.codehilite .mo { color: #40E; font-weight: bold }
.codehilite .sa { color: #D20 }
.codehilite .sb { color: #D20 }
.codehilite .sc { color: #04D }
.codehilite .dl { color: #D20 }
.codehilite .sd { color: #D42 }
.codehilite .s2 { color: #D20 }
.codehilite .se { color: #666; font-weight: bold }
.codehilite .sh { color: #D20 }
.codehilite .si { color: #60E }
.codehilite .sx { color: #D20 }
.codehilite .sr { color: #06B }
.codehilite .s1 { color: #D20 }
.codehilite .ss { color: #A60 }
.codehilite .bp { color: #007020 }
.codehilite .fm { color: #06B; font-weight: bold }
.codehilite .vc { color: #369 }
.codehilite .vg { color: #D70; font-weight: bold }
.codehilite .vi { color: #33B }
.codehilite .vm { color: #963 }
.codehilite .il { color: #00D; font-weight: bold }

/* Pygments syntax highlighting — dark mode (monokai) */
[data-theme="dark"] .codehilite .hll { background-color: #49483e }
[data-theme="dark"] .codehilite { background: #272822; color: #F8F8F2 }
[data-theme="dark"] .codehilite .c { color: #959077 }
[data-theme="dark"] .codehilite .err { color: #ED007E; background-color: #1E0010 }
[data-theme="dark"] .codehilite .k { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .l { color: #AE81FF }
[data-theme="dark"] .codehilite .n { color: #F8F8F2 }
[data-theme="dark"] .codehilite .o { color: #FF4689 }
[data-theme="dark"] .codehilite .p { color: #F8F8F2 }
[data-theme="dark"] .codehilite .ch { color: #959077 }
[data-theme="dark"] .codehilite .cm { color: #959077 }
[data-theme="dark"] .codehilite .cp { color: #959077 }
[data-theme="dark"] .codehilite .cpf { color: #959077 }
[data-theme="dark"] .codehilite .c1 { color: #959077 }
[data-theme="dark"] .codehilite .cs { color: #959077 }
[data-theme="dark"] .codehilite .gd { color: #FF4689 }
[data-theme="dark"] .codehilite .ge { color: #F8F8F2; font-style: italic }
[data-theme="dark"] .codehilite .gi { color: #A6E22E }
[data-theme="dark"] .codehilite .go { color: #66D9EF }
[data-theme="dark"] .codehilite .gp { color: #FF4689; font-weight: bold }
[data-theme="dark"] .codehilite .gs { color: #F8F8F2; font-weight: bold }
[data-theme="dark"] .codehilite .gu { color: #959077 }
[data-theme="dark"] .codehilite .kc { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .kd { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .kn { color: #FF4689; font-weight: normal }
[data-theme="dark"] .codehilite .kp { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .kr { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .kt { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .ld { color: #E6DB74 }
[data-theme="dark"] .codehilite .m { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .s { color: #E6DB74 }
[data-theme="dark"] .codehilite .na { color: #A6E22E }
[data-theme="dark"] .codehilite .nb { color: #F8F8F2 }
[data-theme="dark"] .codehilite .nc { color: #A6E22E; font-weight: normal }
[data-theme="dark"] .codehilite .no { color: #66D9EF; font-weight: normal }
[data-theme="dark"] .codehilite .nd { color: #A6E22E; font-weight: normal }
[data-theme="dark"] .codehilite .ne { color: #A6E22E; font-weight: normal }
[data-theme="dark"] .codehilite .nf { color: #A6E22E; font-weight: normal }
[data-theme="dark"] .codehilite .nn { color: #F8F8F2; font-weight: normal }
[data-theme="dark"] .codehilite .nt { color: #FF4689 }
[data-theme="dark"] .codehilite .nv { color: #F8F8F2 }
[data-theme="dark"] .codehilite .ow { color: #FF4689; font-weight: normal }
[data-theme="dark"] .codehilite .w { color: #F8F8F2 }
[data-theme="dark"] .codehilite .mb { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .mf { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .mh { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .mi { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .mo { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .sa { color: #E6DB74 }
[data-theme="dark"] .codehilite .sb { color: #E6DB74 }
[data-theme="dark"] .codehilite .sc { color: #E6DB74 }
[data-theme="dark"] .codehilite .dl { color: #E6DB74 }
[data-theme="dark"] .codehilite .sd { color: #E6DB74 }
[data-theme="dark"] .codehilite .s2 { color: #E6DB74 }
[data-theme="dark"] .codehilite .se { color: #AE81FF; font-weight: normal }
[data-theme="dark"] .codehilite .sh { color: #E6DB74 }
[data-theme="dark"] .codehilite .si { color: #E6DB74 }
[data-theme="dark"] .codehilite .sx { color: #E6DB74 }
[data-theme="dark"] .codehilite .sr { color: #E6DB74 }
[data-theme="dark"] .codehilite .s1 { color: #E6DB74 }
[data-theme="dark"] .codehilite .ss { color: #E6DB74 }
[data-theme="dark"] .codehilite .bp { color: #F8F8F2 }
[data-theme="dark"] .codehilite .fm { color: #A6E22E; font-weight: normal }
[data-theme="dark"] .codehilite .vc { color: #F8F8F2 }
[data-theme="dark"] .codehilite .vg { color: #F8F8F2; font-weight: normal }
[data-theme="dark"] .codehilite .vi { color: #F8F8F2 }
[data-theme="dark"] .codehilite .vm { color: #F8F8F2 }
[data-theme="dark"] .codehilite .il { color: #AE81FF; font-weight: normal }

/* Token chips: consistent visual language for tokens */
.tok {
  display: inline-block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  padding: 0.1em 0.4em;
  margin: 0 0.1em;
  line-height: 1.4;
  vertical-align: baseline;
}

.tok-bos {
  background: var(--brand-light);
  border-color: var(--brand);
  color: var(--brand-dark);
  font-weight: 600;
}

.tok sub {
  font-size: 0.7em;
  color: var(--text-muted);
  margin-left: 0.15em;
}

/* Token sequence: a row of chips */
.tok-seq {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
  margin: 1rem 0;
  font-family: "IBM Plex Mono", monospace;
}

.tok-seq .tok-arrow {
  color: var(--text-muted);
  font-size: 0.9em;
}

/* So-far recap sidebar */
.so-far {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 1100px) {
  .so-far {
    float: right;
    width: 260px;
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    margin-right: -290px;
    position: sticky;
    top: 1rem;
  }
}

.so-far h4 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brand);
  margin-bottom: 0.4rem;
  font-family: "IBM Plex Mono", monospace;
}

.so-far code {
  font-size: 0.75rem;
  background: var(--code-bg);
  padding: 0.1em 0.25em;
  border-radius: 0.2rem;
}

.so-far ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.so-far li {
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.step-card-upcoming {
  opacity: 0.4;
  pointer-events: none;
  position: relative;
}

.coming-soon {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
}

/* Selectable token chips */
.tok-selectable:hover {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
}

/* Interactive boxes */
.interactive {
  margin: 1.5rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 2px solid var(--brand);
  border-radius: 0.5rem;
}

.interactive h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brand);
  margin-top: 0;
  margin-bottom: 0.75rem;
}

/* Interactive token input */
.tok-input {
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.1rem;
  padding: 0.5rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--text);
  width: 100%;
  max-width: 300px;
  margin-bottom: 1rem;
  outline: none;
}

.tok-input:focus {
  border-color: var(--brand);
}

.tok-input::placeholder,
.tok-textarea::placeholder {
  color: var(--text-muted);
}

.tok-textarea {
  font-family: "IBM Plex Mono", monospace;
  font-size: 1rem;
  padding: 0.5rem 0.75rem;
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface);
  color: var(--text);
  width: 100%;
  max-width: 400px;
  resize: vertical;
  outline: none;
}

.tok-textarea:focus {
  border-color: var(--brand);
}

.tok-ignored {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.tok-ignored code {
  background: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 0.2rem;
  color: var(--brand);
}

/* Count table */
.count-table-wrapper {
  overflow-x: auto;
  margin: 0.5rem 0;
}

.count-table {
  border-collapse: collapse;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.6rem;
  line-height: 1;
}

.count-table .ct-corner {
  font-size: 0.55rem;
  color: var(--text-muted);
  text-align: center;
  padding: 0.2rem;
}

.count-table .ct-row-label { color: var(--brand); }
.count-table .ct-col-label { color: var(--brand); }

.count-table .ct-header,
.count-table .ct-row-header {
  padding: 0.2rem 0.3rem;
  text-align: center;
  font-weight: 600;
  color: var(--text);
}

.count-table .ct-header.ct-bos,
.count-table .ct-row-header.ct-bos {
  color: var(--brand);
}

.count-table .ct-cell {
  padding: 0.2rem 0.3rem;
  text-align: center;
  color: var(--text-muted);
  min-width: 1.4em;
  border: 1px solid var(--border-light);
}

/* Trainer interactive */
.trainer-info {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  min-height: 1.8em;
}

.trainer-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem 0;
  margin-bottom: 1rem;
}

.trainer-step-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Loss example highlight */
.loss-highlight {
  color: var(--brand-dark);
  font-size: 1.05em;
}

/* Sampler interactive */
.sampler-output {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.sampler-name {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.95rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  padding: 0.25em 0.6em;
}

/* Shuffle interactive */
.shuffle-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.shuffle-name {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 0.3rem;
  padding: 0.2em 0.5em;
}

.shuffle-btn {
  font-family: "IBM Plex Sans", sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--brand);
  color: white;
  border: none;
  border-radius: 0.4rem;
  padding: 0.4rem 1.2rem;
  cursor: pointer;
}

.shuffle-btn:hover {
  opacity: 0.85;
}

/* Code breakdown: annotated chain of operations */
.code-breakdown {
  margin: 1.5rem 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  overflow-x: auto;
}

.code-breakdown table {
  border-collapse: collapse;
  width: 100%;
}

.code-breakdown td {
  padding: 0.4rem 0.75rem;
  vertical-align: top;
  border-bottom: 1px solid var(--border-light);
}

.code-breakdown tr:last-child td {
  border-bottom: none;
}

.code-breakdown .cb-code {
  white-space: nowrap;
  color: var(--brand-dark);
  font-weight: 600;
  width: 1%;
}

.code-breakdown .cb-arrow {
  width: 1%;
  color: var(--text-muted);
  text-align: center;
  padding: 0.4rem 0.25rem;
}

.code-breakdown .cb-desc {
  font-family: "IBM Plex Serif", serif;
  font-size: 0.95rem;
  font-weight: normal;
  color: var(--text);
}

.code-breakdown .cb-result {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Substep sections within a step page */
.substep {
  margin: 2rem 0;
  padding: 1.5rem;
  border: 1px solid var(--border-light);
  border-radius: 0.5rem;
  background: var(--surface);
}

/* Substep timeline on step overview */
.substep-timeline {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  border-left: 3px solid var(--border-light);
}

.substep-timeline li {
  padding: 0.4rem 0 0.4rem 1.25rem;
  position: relative;
}

.substep-timeline li::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 50%;
  transform: translateY(-50%);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--brand);
}

.substep-timeline a {
  text-decoration: none;
  color: var(--text);
  font-size: 1rem;
}

.substep-timeline a:hover {
  color: var(--brand);
}

.substep-number {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.85rem;
  color: var(--brand);
  font-weight: 600;
  margin-right: 0.4rem;
}

/* Diagram containers */
.diagram {
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 0.5rem;
  text-align: center;
}

.diagram svg {
  max-width: 100%;
}

/* Key insight callouts */
.insight {
  background: var(--brand-light);
  border-left: 4px solid var(--brand);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 0.5rem 0.5rem 0;
  font-style: italic;
}

/* Step navigation */
.step-nav {
  display: flex;
  justify-content: space-between;
  font-family: "IBM Plex Sans", sans-serif;
}

.step-nav-top {
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.step-nav-bottom {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.85rem;
}