/* bone — classless CSS base. Drop in, HTML looks clean. */
/* https://axiomlayer.com */

/* ---- Font ---- */
/* Swap one import to change the entire site's typeface. */

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

/* ---- Reset ---- */

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

/* ---- Root & Typography ---- */

:root {
  --bone-font: 'IBM Plex Mono', ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
  --bone-line-height: 1.6;
  --bone-max-width: 72ch;
  --bone-radius: 3px;

  /* Light mode — zinc palette */
  --bone-bg: #ffffff;
  --bone-fg: #27272a;
  --bone-muted: #71717a;
  --bone-border: #e4e4e7;
  --bone-accent: #27272a;
  --bone-accent-hover: #09090b;
  --bone-surface: #f4f4f5;
  --bone-code-bg: #f4f4f5;
  --bone-mark: #fafaf9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bone-bg: #09090b;
    --bone-fg: #e4e4e7;
    --bone-muted: #a1a1aa;
    --bone-border: #3f3f46;
    --bone-accent: #e4e4e7;
    --bone-accent-hover: #ffffff;
    --bone-surface: #18181b;
    --bone-code-bg: #18181b;
    --bone-mark: #27272a;
  }
}

html {
  font-family: var(--bone-font);
  font-size: 100%;
  line-height: var(--bone-line-height);
  color: var(--bone-fg);
  background: var(--bone-bg);
  -webkit-text-size-adjust: 100%;
}

body {
  max-width: var(--bone-max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* ---- Headings ---- */

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: 700;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; color: var(--bone-muted); }

h1:first-child,
h2:first-child,
h3:first-child {
  margin-top: 0;
}

/* ---- Block elements ---- */

p, ul, ol, dl, blockquote, pre, table, figure, details, hr {
  margin-bottom: 1rem;
}

/* ---- Links ---- */

a {
  color: var(--bone-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

/* ---- Lists ---- */

ul, ol {
  padding-left: 1.5em;
}

li + li {
  margin-top: 0.25em;
}

dt {
  font-weight: 700;
  margin-top: 0.5em;
}

dd {
  margin-left: 1.5em;
}

/* ---- Blockquote ---- */

blockquote {
  border-left: 2px solid var(--bone-border);
  padding: 0.5em 1em;
  color: var(--bone-muted);
}

/* ---- Code ---- */

code, kbd, samp {
  font-family: var(--bone-font);
  font-size: 0.9em;
  background: var(--bone-code-bg);
  padding: 0.15em 0.3em;
  border-radius: var(--bone-radius);
}

pre {
  background: var(--bone-code-bg);
  padding: 1em;
  border-radius: var(--bone-radius);
  overflow-x: auto;
  line-height: 1.4;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
}

/* ---- Tables ---- */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th, td {
  text-align: left;
  padding: 0.5em 0.75em;
  border-bottom: 1px solid var(--bone-border);
}

th {
  font-weight: 700;
}

/* ---- Forms ---- */

input, select, textarea, button {
  font: inherit;
  color: inherit;
  border-radius: var(--bone-radius);
}

input, select, textarea {
  display: block;
  width: 100%;
  padding: 0.5em 0.75em;
  border: 1px solid var(--bone-border);
  background: var(--bone-bg);
  margin-bottom: 0.75rem;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--bone-fg);
  outline-offset: -1px;
  border-color: var(--bone-fg);
}

textarea {
  min-height: 6em;
  resize: vertical;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

input[type="checkbox"],
input[type="radio"] {
  display: inline;
  width: auto;
  margin-right: 0.5em;
}

button,
input[type="submit"],
input[type="reset"],
input[type="button"] {
  display: inline-block;
  width: auto;
  padding: 0.5em 1.25em;
  background: var(--bone-fg);
  color: var(--bone-bg);
  border: none;
  cursor: pointer;
  font-weight: 600;
}

button:hover,
input[type="submit"]:hover {
  background: var(--bone-accent-hover);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

fieldset {
  border: 1px solid var(--bone-border);
  border-radius: var(--bone-radius);
  padding: 1em;
  margin-bottom: 1rem;
}

legend {
  font-weight: 700;
  padding: 0 0.5em;
}

/* ---- Media ---- */

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

figure {
  text-align: center;
}

figcaption {
  font-size: 0.875rem;
  color: var(--bone-muted);
  margin-top: 0.5em;
}

/* ---- Misc ---- */

hr {
  border: none;
  border-top: 1px solid var(--bone-border);
}

mark {
  background: var(--bone-mark);
  padding: 0.1em 0.2em;
  border-radius: 2px;
}

small {
  font-size: 0.875rem;
  color: var(--bone-muted);
}

details {
  border: 1px solid var(--bone-border);
  border-radius: var(--bone-radius);
  padding: 0.75em 1em;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details[open] summary {
  margin-bottom: 0.5em;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 1em;
  flex-wrap: wrap;
}

nav a {
  text-decoration: none;
}

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

/* ---- Print ---- */

@media print {
  body {
    max-width: none;
    padding: 0;
    color: #000;
    background: #fff;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  pre, code {
    border: 1px solid #ddd;
  }

  nav, button, input[type="submit"] {
    display: none;
  }
}