/*!
 * EldanCSS — a tiny, classless CSS stylesheet.
 * Copyright (c) 2026 EldanCSS contributors
 * SPDX-License-Identifier: 0BSD
 * Licensed under the BSD Zero Clause License. See LICENSE.
 */

@property --hue {
  syntax: "<number>";
  inherits: true;
  initial-value: 241;
}

@property --saturation {
  syntax: "<number>";
  inherits: true;
  initial-value: 1;
}

:root {
  color-scheme: light dark;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --font-heading: var(--font-mono);

  --hue: 241;
  --saturation: 1;
  --color-bg: light-dark(hsl(var(--hue) calc(25% * var(--saturation)) 98%), hsl(var(--hue) calc(20% * var(--saturation)) 8%));
  --color-surface: light-dark(hsl(var(--hue) calc(25% * var(--saturation)) 100%), hsl(var(--hue) calc(18% * var(--saturation)) 11%));
  --color-text: light-dark(hsl(var(--hue) calc(18% * var(--saturation)) 14%), hsl(var(--hue) calc(18% * var(--saturation)) 92%));
  --color-muted: light-dark(hsl(var(--hue) calc(10% * var(--saturation)) 40%), hsl(var(--hue) calc(12% * var(--saturation)) 68%));
  --color-border: light-dark(hsl(var(--hue) calc(14% * var(--saturation)) 86%), hsl(var(--hue) calc(14% * var(--saturation)) 22%));
  --color-accent: light-dark(hsl(var(--hue) calc(62% * var(--saturation)) calc(48% - 9% * (1 - var(--saturation)))), hsl(var(--hue) calc(75% * var(--saturation)) 72%));
  --color-accent-hover: light-dark(hsl(var(--hue) calc(66% * var(--saturation)) calc(40% - 9% * (1 - var(--saturation)))), hsl(var(--hue) calc(80% * var(--saturation)) 80%));
  --color-accent-soft: light-dark(color-mix(in oklab, var(--color-accent) 12%, transparent), color-mix(in oklab, var(--color-accent) 18%, transparent));
  --color-on-accent: light-dark(#fff, hsl(var(--hue) calc(20% * var(--saturation)) 10%));
  --color-code: light-dark(hsl(var(--hue) calc(20% * var(--saturation)) 95%), hsl(var(--hue) calc(18% * var(--saturation)) 13%));
  --color-danger: light-dark(hsl(0 calc(65% * var(--saturation)) calc(48% - 9% * (1 - var(--saturation)))), hsl(0 calc(70% * var(--saturation)) 65%));

  --measure: 82ch;
  --radius: 0.4rem;
  --radius-lg: 0.75rem;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1.0625rem;
  --text-lg: 1.25rem;
  --h1: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  --h2: clamp(1.75rem, 1.35rem + 1.6vw, 2.5rem);
  --h3: clamp(1.4rem, 1.2rem + 0.8vw, 1.75rem);
  --h4: 1.25rem;
  --h5: 1.0625rem;
  --h6: 0.875rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
}


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

* {
  margin: 0;
}

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  max-width: var(--measure);
  margin-inline: auto;
  padding: clamp(var(--space-4), 4vw, var(--space-7));
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  letter-spacing: 0.01em;
  word-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

body > :first-child {
  margin-top: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-block: var(--space-6) var(--space-3);
  color: var(--color-text);
  font-family: var(--font-heading);
  line-height: 1.15;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

h1 {
  font-size: var(--h1);
  letter-spacing: -0.06em;
}

h2 {
  font-size: var(--h2);
}

h3 {
  font-size: var(--h3);
}

h4 {
  font-size: var(--h4);
}

h5 {
  font-size: var(--h5);
}

h6 {
  color: var(--color-muted);
  font-size: var(--h6);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

p,
ul,
ol,
dl,
blockquote,
pre,
table,
figure,
details,
fieldset {
  margin-block: 0 var(--space-4);
}

p {
  text-wrap: pretty;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

strong {
  font-weight: 650;
}

small {
  color: var(--color-muted);
  font-size: var(--text-sm);
}

mark {
  padding: 0.1em 0.2em;
  border-radius: 0.2em;
  background: var(--color-accent-soft);
  color: inherit;
}

abbr[title] {
  text-decoration: underline dotted;
  cursor: help;
}

ul,
ol {
  padding-inline-start: 1.5rem;
}

li + li {
  margin-block-start: var(--space-1);
}

li > ul,
li > ol {
  margin-block: var(--space-2) 0;
}

::marker {
  color: var(--color-muted);
}

nav ul,
nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

nav li {
  margin: 0;
}

nav ul a,
nav ol a {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.55rem;
  border-radius: var(--radius);
  color: var(--color-muted);
  font-size: var(--text-sm);
  text-decoration: none;
}

nav ul a:hover,
nav ol a:hover {
  background: var(--color-accent-soft);
  color: var(--color-text);
}

nav ul a[aria-current="page"],
nav ol a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 650;
}

nav :is(ul, ol) :is(ul, ol) {
  display: block;
  padding-inline-start: var(--space-3);
}

dt {
  margin-block-start: var(--space-2);
  font-weight: 650;
}

dd {
  margin-inline-start: 1.5rem;
}

blockquote {
  padding-inline-start: var(--space-4);
  border-inline-start: 3px solid var(--color-accent);
  color: var(--color-muted);
}

blockquote > :last-child {
  margin-block-end: 0;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

:not(pre) > code {
  padding: 0.1em 0.35em;
  border: 1px solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-code);
}

pre {
  overflow-x: auto;
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-code);
  font-size: var(--text-sm);
  line-height: 1.55;
  tab-size: 2;
}

pre code {
  font-size: inherit;
}

kbd {
  padding: 0.1em 0.4em;
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: 0.3rem;
  background: var(--color-surface);
  font-size: 0.8em;
}

hr {
  margin-block: var(--space-6);
  border: 0;
  border-top: 1px solid var(--color-border);
}

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

svg {
  max-width: 100%;
  height: auto;
}

img {
  border-radius: var(--radius);
}

figure {
  margin-inline: 0;
}

figure > img,
figure > svg,
figure > video {
  display: block;
  margin-inline: auto;
}

figcaption {
  margin-block-start: var(--space-2);
  color: var(--color-muted);
  font-size: var(--text-sm);
  text-align: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

caption {
  padding-block-start: var(--space-2);
  caption-side: bottom;
  color: var(--color-muted);
  font-size: var(--text-sm);
  text-align: start;
}

th,
td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  text-align: start;
  vertical-align: top;
}

thead th {
  border-bottom-color: var(--color-accent);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

tbody tr:last-child > * {
  border-bottom: 0;
}

tfoot {
  font-weight: 650;
}

fieldset {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

legend {
  padding-inline: var(--space-1);
  font-weight: 650;
}

label {
  display: block;
  margin-block-end: var(--space-2);
  font-weight: 600;
}

label:has(> input[type="checkbox"]),
label:has(> input[type="radio"]) {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 400;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-text);
  font: inherit;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
  accent-color: var(--color-accent);
}

input[type="range"] {
  width: 100%;
  padding: 0;
  accent-color: var(--color-accent);
}

input[type="file"] {
  padding: 0.5rem;
}

input[type="file"]::file-selector-button {
  margin-inline-end: var(--space-3);
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: 0.3rem;
  background: var(--color-code);
  color: var(--color-text);
  font: inherit;
  cursor: pointer;
}

input[type="color"] {
  width: 3rem;
  height: 2.5rem;
  padding: 0.2rem;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

input:not([type="checkbox"]):not([type="radio"]),
select,
textarea,
progress,
meter {
  margin-block-end: var(--space-3);
}

fieldset > :last-child {
  margin-block-end: 0;
}

::placeholder {
  color: var(--color-muted);
  opacity: 1;
}

input:user-invalid,
select:user-invalid,
textarea:user-invalid {
  border-color: var(--color-danger);
}

input:user-invalid:focus-visible,
select:user-invalid:focus-visible,
textarea:user-invalid:focus-visible {
  outline-color: var(--color-danger);
}

button,
input[type="submit"],
input[type="button"],
input[type="reset"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: auto;
  padding: 0.6rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: var(--color-on-accent);
  font-weight: 650;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

button:not(:disabled):hover,
input[type="submit"]:not(:disabled):hover,
input[type="button"]:not(:disabled):hover,
input[type="reset"]:not(:disabled):hover {
  background: var(--color-accent-hover);
}

button:disabled,
input[type="submit"]:disabled,
input[type="button"]:disabled,
input[type="reset"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

[aria-busy="true"] {
  cursor: progress;
}

[aria-busy="true"]:not(input, select, textarea, html)::after {
  display: inline-block;
  margin-inline-start: var(--space-1);
  content: "...";
  white-space: nowrap;
  animation: busy-dots 1.2s linear infinite;
}

button[aria-busy="true"]::after {
  margin-inline-start: 0;
}

button[aria-busy="true"] {
  pointer-events: none;
}

@keyframes busy-dots {
  0%,
  24% {
    clip-path: inset(0 100% 0 0);
  }

  25%,
  49% {
    clip-path: inset(0 67% 0 0);
  }

  50%,
  74% {
    clip-path: inset(0 34% 0 0);
  }

  75%,
  100% {
    clip-path: inset(0 0 0 0);
  }
}

details {
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  overflow: hidden;
}

summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-weight: 650;
  list-style: none;
  cursor: pointer;
}

summary::-webkit-details-marker {
  display: none;
}

summary::marker {
  content: "";
}

summary::after {
  content: "+";
  flex: none;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-weight: 500;
  line-height: 1;
}

details[open] > summary::after {
  content: "−";
}

details > summary:hover {
  background: var(--color-accent-soft);
}

details[open] > summary {
  border-block-end: 1px solid var(--color-border);
}

summary:focus-visible {
  outline-offset: -2px;
}

summary + * {
  margin-block-start: var(--space-3);
}

details > :not(summary) {
  margin-inline: var(--space-4);
}

details > :last-child:not(summary) {
  margin-block-end: var(--space-4);
}

dialog,
[popover] {
  inset: 0;
  max-width: min(90vw, 36rem);
  max-height: calc(100% - 2rem);
  margin: auto;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: none;
  overflow: auto;
}

dialog::backdrop {
  background: hsl(var(--hue) calc(20% * var(--saturation)) 5% / 0.65);
}

[popover]::backdrop {
  background: transparent;
}

dialog > :first-child,
[popover] > :first-child {
  margin-block-start: 0;
}

dialog > :last-child,
[popover] > :last-child {
  margin-block-end: 0;
}

dialog form,
[popover] form {
  margin: 0;
}

[popover] nav > :is(ul, ol) {
  display: grid;
  gap: var(--space-1);
}

[popover] nav > :is(ul, ol) > li > a {
  display: flex;
}

article {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

article > :first-child {
  margin-block-start: 0;
}

article > :last-child {
  margin-block-end: 0;
}

article + article {
  margin-block-start: var(--space-4);
}

progress,
meter {
  width: 100%;
  height: 0.75rem;
  accent-color: var(--color-accent);
}

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