:root {
  --paper: #f2f4f1;
  --field: #ffffff;
  --ink: #0e1b3d;
  --muted: #4b5878;
  --hint: #5f6b88;
  --rule: #c9d0cb;
  --edge: #8a96a8;
  --blue: #1f4fd1;
  --yellow: #ffc72c;
  --yellow-hover: #ffb800;
  --on-yellow: #0e1b3d;
  --bad: #b3261e;
  --sans:
    "Avenir Next", "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, "Helvetica Neue",
    sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

:root:not([data-theme="light"]) {
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0b1530;
    --field: #101d42;
    --ink: #e6ebf7;
    --muted: #a3afcb;
    --hint: #9aa7c6;
    --rule: #26355f;
    --edge: #5a6a96;
    --blue: #8fb0ff;
    --bad: #ff8a80;
  }
}

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

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.5 var(--sans);
}

h1,
h2,
h3,
p {
  margin: 0;
}

code,
pre,
textarea,
input[type="text"] {
  font-family: var(--mono);
}

code {
  font-size: 0.9em;
}

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

/* ---------------------------------------------------------------- header */

.top {
  padding: 28px 32px 22px;
  border-bottom: 1px solid var(--rule);
}

.top h1 {
  font-size: 28px;
  font-weight: 650;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.top p {
  margin-top: 8px;
  max-width: 62ch;
  color: var(--muted);
}

.jump {
  display: none;
  margin-top: 10px;
  color: var(--blue);
  font-weight: 600;
}

/* ---------------------------------------------------------------- layout */

.app {
  display: grid;
  grid-template-columns: minmax(340px, 460px) minmax(0, 1fr);
  align-items: start;
}

.input {
  padding: 0 32px 48px;
  border-right: 1px solid var(--rule);
}

.output {
  padding: 0 32px 48px;
  min-width: 0;
}

@media (max-width: 860px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
  }

  .top,
  .input,
  .output {
    padding-inline: 16px;
  }

  .input {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  /* The files are a long scroll below the form on a phone, so say where they are. */
  .jump {
    display: inline-block;
  }
}

/* ---------------------------------------------------------------- input: tabs */

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--rule);
}

.tabs button {
  min-height: 44px;
  padding: 0 14px;
  border: 0;
  background: none;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.tabs button[aria-selected="true"] {
  color: var(--ink);
  box-shadow: inset 0 -3px 0 var(--yellow);
}

/* ---------------------------------------------------------------- input: fields */

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

fieldset + fieldset {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

/* Floated so the heading sits inside the group, not notched into its top rule. */
legend {
  float: left;
  width: 100%;
  padding: 0 0 6px;
  font-size: 17px;
  font-weight: 650;
}

legend + * {
  clear: both;
}

.intro {
  margin-bottom: 12px;
  max-width: 56ch;
  color: var(--muted);
  font-size: 14px;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
}

.field input[type="text"],
.field textarea,
.field select {
  display: block;
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--edge);
  border-radius: 6px;
  background: var(--field);
  color: var(--ink);
  font-size: 13.5px;
  line-height: 1.45;
}

.field select {
  font-family: var(--sans);
  font-size: 14.5px;
}

.field textarea {
  resize: vertical;
}

.field ::placeholder {
  color: var(--hint);
  opacity: 1;
}

.hint {
  margin-top: 4px;
  max-width: 56ch;
  color: var(--hint);
  font-size: 13px;
}

.field.check label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 0;
}

.field.check input {
  flex: none;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--blue);
}

.field.check .hint {
  margin-left: 28px;
}

#json {
  min-height: 420px;
  font-size: 13px;
  white-space: pre;
  overflow: auto;
}

.existing {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.existing summary {
  cursor: pointer;
  font-size: 17px;
  font-weight: 650;
}

.existing p {
  margin: 8px 0 14px;
  max-width: 56ch;
  color: var(--muted);
  font-size: 14px;
}

/* ---------------------------------------------------------------- output */

.bar {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  margin-bottom: 14px;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.bar h2 {
  font-size: 17px;
  font-weight: 650;
}

.actions {
  display: flex;
  gap: 8px;
}

button.primary,
button.secondary {
  min-height: 42px;
  padding: 0 18px;
  border-radius: 6px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

button.primary {
  border: 1px solid var(--yellow);
  background: var(--yellow);
  color: var(--on-yellow);
}

button.primary:hover:not(:disabled) {
  background: var(--yellow-hover);
}

button.secondary {
  border: 1px solid var(--edge);
  background: transparent;
  color: var(--ink);
}

button.secondary:hover:not(:disabled) {
  border-color: var(--ink);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

#status {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 14px;
}

#empty p {
  max-width: 48ch;
  margin-bottom: 12px;
}

#problems {
  margin-bottom: 20px;
}

#problems h3,
.preview h3 {
  font-size: 15px;
  font-weight: 650;
}

ul.issues,
ul.warnings,
.notes ul {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

ul.issues li,
ul.warnings li {
  margin: 8px 0;
  padding-left: 12px;
  max-width: 76ch;
}

ul.issues li {
  border-left: 3px solid var(--bad);
}

ul.warnings li {
  border-left: 3px solid var(--yellow);
}

.problem {
  margin-top: 6px;
  padding-left: 12px;
  border-left: 3px solid var(--bad);
  font-family: var(--mono);
  font-size: 13px;
}

.example {
  display: block;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
}

/* The file list is what you are about to deploy, so it gets the most weight on the page. */
.files {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
}

.files li {
  border-bottom: 1px solid var(--rule);
}

.files button {
  display: block;
  width: 100%;
  padding: 10px 12px;
  border: 0;
  border-left: 4px solid transparent;
  background: none;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.files button:hover {
  background: color-mix(in srgb, var(--ink) 6%, transparent);
}

.files button[aria-current="true"] {
  border-left-color: var(--yellow);
  background: color-mix(in srgb, var(--ink) 8%, transparent);
}

.files .path {
  display: block;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.files .dir {
  color: var(--muted);
  font-weight: 400;
}

.files .what {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

/* Wide enough: the list on the left, the file you picked on the right, and it stays in view while you read it. */
@media (min-width: 1200px) {
  #result {
    display: grid;
    grid-template-columns: minmax(280px, 2fr) minmax(0, 3fr);
    column-gap: 28px;
    align-items: start;
  }

  .preview {
    position: sticky;
    top: 78px;
  }

  .preview pre {
    max-height: calc(100vh - 230px);
  }

  .notes {
    grid-column: 1 / -1;
  }
}

.preview p {
  margin: 2px 0 10px;
  max-width: 76ch;
  color: var(--muted);
  font-size: 13.5px;
}

.preview pre {
  margin: 0;
  max-height: 56vh;
  padding: 12px 14px;
  overflow: auto;
  border: 1px solid var(--edge);
  border-radius: 6px;
  background: var(--field);
  font-size: 12.5px;
  line-height: 1.5;
  tab-size: 2;
}

.notes {
  margin-top: 20px;
}

.notes summary {
  cursor: pointer;
  font-weight: 650;
}

.notes li {
  margin: 6px 0;
  max-width: 76ch;
  color: var(--muted);
  font-size: 14px;
}