@font-face {
  font-family: "Source Sans 3";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./fonts/source-sans-3-latin-400.woff2") format("woff2");
}

@font-face {
  font-family: "Source Sans 3";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("./fonts/source-sans-3-latin-600.woff2") format("woff2");
}

@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./fonts/source-serif-4-latin-400.woff2") format("woff2");
}

@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("./fonts/source-serif-4-latin-600.woff2") format("woff2");
}

:root {
  --paper: #f4f1ea;
  --ink: #1e3333;
  --ink-soft: color-mix(in srgb, var(--ink) 58%, var(--paper));
  --line: color-mix(in srgb, var(--ink) 18%, var(--paper));
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --measure: 36rem;
  --font-ui: "Source Sans 3", system-ui, sans-serif;
  --font-num: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --target: 2.75rem;
}

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

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-ui);
  font-size: 1.0625rem;
  line-height: 1.45;
  color: var(--ink);
  background: var(--paper);
  accent-color: var(--ink);
  caret-color: var(--ink);
  padding-block: max(var(--space-6), env(safe-area-inset-top))
    max(var(--space-8), env(safe-area-inset-bottom));
  padding-inline: max(var(--space-4), env(safe-area-inset-left))
    max(var(--space-4), env(safe-area-inset-right));
}

::selection {
  background: color-mix(in srgb, var(--ink) 22%, var(--paper));
  color: var(--ink);
}

:focus {
  outline: none;
}

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

.wrap {
  width: min(100%, var(--measure));
  margin-inline: auto;
}

h1 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-num);
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.lede {
  margin: 0 0 var(--space-10);
  color: var(--ink-soft);
  max-width: 38ch;
}

form {
  display: flex;
  flex-direction: column;
}

.fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-width: 0;
}

label,
.result-heading {
  font-size: 0.9375rem;
  font-weight: 600;
}

input[type="text"] {
  width: 100%;
  min-width: 0;
  min-height: var(--target);
  margin: 0;
  padding: var(--space-2) var(--space-3);
  font: inherit;
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--ink);
  border-radius: 2px;
  overflow-wrap: anywhere;
}

input[type="text"]::placeholder {
  color: var(--ink-soft);
  opacity: 1;
}

.hint {
  margin: var(--space-4) 0 0;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

.result {
  margin-block: var(--space-10) var(--space-6);
  padding-block: var(--space-5);
  border-block: 1px solid var(--line);
}

.result-heading {
  margin: 0 0 var(--space-2);
}

.result-value {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(3.25rem, 14vw, 6rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums lining-nums;
  overflow-wrap: anywhere;
  user-select: all;
}

.result-value.is-empty {
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 1.4;
  color: var(--ink-soft);
}

.actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

button {
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border-radius: 2px;
  min-height: var(--target);
  padding-inline: var(--space-5);
}

button:disabled {
  cursor: not-allowed;
  color: var(--ink-soft);
  background: color-mix(in srgb, var(--ink) 8%, var(--paper));
  border-color: var(--line);
}

.btn-copy {
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
}

@media (hover: hover) and (pointer: fine) {
  .btn-copy:hover:not(:disabled) {
    background: color-mix(in srgb, var(--ink) 88%, var(--paper));
  }

  .btn-clear:hover:not(:disabled) {
    background: color-mix(in srgb, var(--ink) 8%, var(--paper));
  }
}

.btn-copy:active:not(:disabled) {
  background: color-mix(in srgb, var(--ink) 80%, #000);
}

.btn-clear {
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
}

.status {
  min-height: 1.45em;
  margin: var(--space-3) 0 0;
  font-size: 0.9375rem;
}

.status.is-error {
  color: var(--ink);
}

.help {
  margin-top: var(--space-12);
  border-top: 1px solid var(--line);
  padding-top: var(--space-5);
}

.help summary {
  cursor: pointer;
  font-weight: 600;
  min-height: var(--target);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
}

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

.help summary::after {
  content: "";
  width: 0.4em;
  height: 0.4em;
  margin-inline-start: auto;
  border-inline-end: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  translate: 0 -0.15em;
}

.help[open] summary::after {
  transform: rotate(225deg);
  translate: 0 0.1em;
}

.help-body {
  margin: var(--space-3) 0 0;
  color: var(--ink-soft);
  max-width: 48ch;
}

.help-body ul {
  margin: var(--space-3) 0 0;
  padding-inline-start: 1.15em;
}

.help-body li + li {
  margin-top: var(--space-2);
}

.help-body strong {
  color: var(--ink);
  font-weight: 600;
}

@media (min-width: 640px) {
  body {
    padding-block-start: var(--space-12);
  }

  .fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .actions {
    flex-direction: row;
    align-items: stretch;
  }

  .btn-copy {
    flex: 1 1 auto;
  }

  .btn-clear {
    flex: 0 0 auto;
  }
}

@media (max-width: 639px) {
  .actions {
    position: sticky;
    bottom: 0;
    z-index: 1;
    margin-inline: calc(-1 * max(var(--space-4), env(safe-area-inset-left)));
    padding-inline: max(var(--space-4), env(safe-area-inset-left))
      max(var(--space-4), env(safe-area-inset-right));
    padding-top: var(--space-3);
    padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
    background: linear-gradient(
      to bottom,
      color-mix(in srgb, var(--paper) 0%, transparent),
      var(--paper) 28%
    );
  }
}

@media (pointer: coarse) {
  button,
  input[type="text"],
  .help summary {
    min-height: 2.75rem;
  }
}