:root {
  --border-radius: 0.25rem;

  --color-accent: #e4c444;
  --color-border: #555555;
  --color-dark: #363636;
  --color-darker: #2d2d2d;;
  --color-darkest: #242424;
  --color-dim: #bbbbbb;
  --color-text: #e8e8e8;

  --site-padding: 1rem;
}


/* reset */

html {
  box-sizing: border-box;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  line-height: 1.15;
  text-rendering: optimizeLegibility;
}

body {
  font-size: 1rem; /* 16px */
  line-height: 1.5;
}


/* fonts */

body {
  background-color: var(--color-darkest);
  color: var(--color-text);
  font-family: 'Open Sans', sans-serif;
  font-weight: 400 !important;
}

h1,
h2,
h3,
h4,
.site-title {
  font-weight: 700 !important;
}


/* links */

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

a:not(:hover) {
  text-decoration: none;
}


/* layout */

.site-layout {
  display: grid;
  grid-template:
    "header" auto
    "nav"    auto
    "body"   1fr
    "footer" auto;
  height: 100vh;
}

.site-header {
  grid-area: header;
}

.site-nav {
  grid-area: nav;
}

.site-body {
  grid-area: body;
}

.site-footer {
  grid-area: footer;
}

.container {
  margin-inline: auto;
  padding-left: var(--site-padding);
  padding-right: var(--site-padding);
}

@media (min-width: 960px) {
  .container {
    --layout-width: 960px;
    max-width: var(--layout-width);
    width: var(--layout-width);
  }
}

:is(
  h1,
  h2,
  table,
  .block,
):not(:last-child) {
  margin-bottom: 1.5rem;
}

.data-value {
  margin-bottom: 1.5rem;
}

:is(
  .block,
  .button-row,
  table,
).is-hcentered {
  margin-inline: auto;
  width: fit-content;
}


/* grid */

.grid-2columns {
  display: grid;
  column-gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .grid-2columns {
    grid-template-columns: 1fr 1fr;
  }
}


/* rows */

.row {
  display: flex;
  gap: 1rem;
}

.row.is-collapsible {
  flex-direction: column;
}

@media (min-width: 960px) {
  .row.is-collapsible {
    flex-direction: row;
  }
}

.row.is-compact {
  gap: 0.5rem;
}

.row.is-hcentered {
  justify-content: center;
}

.row.is-wrapping {
  flex-wrap: wrap;
}

.row--space-between {
  justify-content: space-between;
}

.column--grow {
  flex-grow: 1;
}


/* header */

.site-header {
  padding-bottom: 4rem;
  padding-top: 3rem;
}

.site-header .site-title {
  font-size: 2rem; /* 32px / 16px */
  line-height: 1.1;
}


/* navigation */

.site-nav {
  background-color: var(--color-darker);
}

.site-nav ol {
  display: flex;
  gap: 0 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  color: var(--color-accent);
  display: block;
  padding: 1rem 0.25rem;
}


/* body */

.site-body {
  background-color: var(--color-dark);
}

.body-section {
  padding-block: 4rem;
}

.body-section:nth-of-type(even) {
  background-color: var(--color-darker);
}


/* footer */

.site-footer {
  padding-bottom: 2rem;
  padding-top: 2rem;
}


/* headings */

h1 {
  font-size: 1.75rem; /* 28px / 16px */
  line-height: 1.2;
  margin-top: 0;
}

h2 {
  font-size: 1.25rem; /* 20px / 16px */
  margin-top: 2rem;
}

:is(h1, h2) small {
  font-weight: normal;
  margin-left: 0.25em;
  opacity: 0.5;
}

h1 small {
  font-size: 1.5rem; /* 24px / 16px */
}

h2 small {
  font-size: 1.125rem; /* 18px / 16px */
}


/* forms */

:is(
  .form-control-block,
  .form-form-errors
):not(:last-child) {
  margin-bottom: 1rem;
}

.form-control-block + .button-row {
  margin-top: 2rem;
}

.form-control-wrapper {
  align-items: center;
  display: flex;
  gap: 0.5rem;
}

.form-control {
  display: block;
}

fieldset {
  border-color: var(--color-border);
  border-style: solid;
  border-width: 0 0 0 1px;
  margin-left: 0.25rem;
  padding: 0 0 0 1.25rem;
}

.form-control-label,
legend {
  color: var(--color-dim);
  display: inline-block;
}

legend {
  margin-left: -2.25rem;
  padding: 0 0.5rem 0.5rem 0.5rem;
}

.form-control-label {
  margin-bottom: 0.35rem;
}

.form-control-label.required::after {
  color: var(--color-accent);
  content: 'required';
  font-size: 0.75rem;
  font-style: italic;
  padding-left: 0.5rem;
}

.form-control-check-label {
  align-items: flex-start;
  display: flex;
}

.form-control-check-label span {
  margin-left: 0.25rem;
}

:is(.form-control-checkboxes, .form-control-radios) ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

input.form-control:not([type='checkbox']):not([type='radio']),
select.form-control,
textarea.form-control {
  background-color: #ffffff;
  border: #bbbbbb solid 1px;
  border-radius: var(--border-radius);
  font-size: 0.875rem; /* 14px / 16px */
  padding: 0.4rem;
}

input.form-control:not([size]):not([type='checkbox']):not([type='date']):not([type='datetime-local']):not([type='radio']):not([type='time']),
textarea.form-control,
.form-control.is-wide {
  width: 100%;
}

input.form-control[readonly] {
  background-color: #e8e8e8 !important;
}

input[type='number'] {
  text-align: right;
}

textarea.form-control {
  height: 20rem;
  resize: vertical;
}

:is(input, textarea):read-only {
  background-color: var(--color-dim);
}

.form-control-caption {
  color: var(--color-dim);
  font-size: 0.75rem; /* 12px / 16px */
  margin-top: 0.35rem;
}

form .form-form-errors,
form .invalid {
  --padding: 0.375rem;
  background-color: #ff9999;
  border: #ff1a1a solid 1px;
  border-radius: var(--border-radius);
  padding: var(--padding);
}

form .invalid {
  margin-block: 1rem;
  margin-inline: calc(var(--padding) * -1 - 1px);
}

.form-errors {
  list-style: none;
  margin: 0;
  padding: 0;
}

.form-errors li {
  font-size: 0.6875rem; /* 11px / 16px */
}

form .form-form-errors li {
  margin: 0.125rem 0;
}

form .invalid .form-errors li {
  margin-top: 0.25rem;
}

.form-errors li span {
  font-style: italic;
}


/* buttons */

.button-row {
  display: flex;
  gap: 0.5rem;
}

.button {
  align-items: center;
  appearance: none;
  background-color: var(--color-darkest);
  border: none;
  border-radius: var(--border-radius);
  color: var(--color-accent);
  cursor: pointer;
  display: inline-flex;
  font-size: 1rem; /* 16px */
  font-weight: normal;
  line-height: 1.3;
  padding: 0.5rem 1rem;
  text-align: center;
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.button:hover {
  background-color: var(--color-accent);
  color: var(--color-darkest);
}


/* TOML output */

.output-control {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.output-control textarea {
  background-color: transparent;
  border: var(--color-border) solid 1px;
  color: var(--color-text);
  flex-grow: 1;
  padding: 1rem;
}


/* misc */

.breadcrumbs {
  margin-bottom: -1rem;
}

.dim {
  color: var(--color-dim);
}

.nowrap {
  white-space: nowrap;
}

.text--centered {
  text-align: center;
}