/* Follows developerdiary.me: Raleway headings and UI text over Georgia body
   text in one centered column, and black buttons. */

:root {
  --text: rgba(0, 0, 0, 0.8);
  --muted: #6c757d;
  --border: #dee2e6;
  --surface: #f8f9fa;
  --code-bg: #eceef0;
  --link: #007bff;
  --link-hover: #0056b3;
  --black: #000;
  --error: #c0392b;
  --mono: SFMono-Regular, Consolas, "Roboto Mono", "Droid Sans Mono", "Liberation Mono", Menlo, Courier, monospace;
  --ui: Raleway, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Syntax colors: muted tones that read on a light background */
  --tok-keyword: #a8526b;
  --tok-string: #4f7f45;
  --tok-number: #9a6f12;
  --tok-constant: #9a6f12;
  --tok-comment: #8a918e;
  --tok-function: #3f6f94;
  --tok-class: #3f6f94;
  --tok-builtin: #7458a0;
  --tok-type: #2f7f78;
}

* { box-sizing: border-box; }

html { font: 112.5%/1.45em georgia, serif; }
@media (max-width: 480px) { html { font-size: 100%; } }

body {
  margin: 0;
  color: var(--text);
  background: #fff;
  font-family: georgia, serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }

/* Layout: one centered column */

main, footer {
  max-width: 48rem;
  margin: 0 auto;
  padding: 2rem 1rem 0;
}

h1 {
  margin: 0 0 0.75rem;
  font: 600 1.75rem/1.2 var(--ui);
}
p { font-family: var(--ui); }
.intro { margin: 0 0 1rem; }
code { font-family: var(--mono); font-size: 0.9em; background: rgba(0, 0, 0, 0.04); border-radius: 3px; padding: 0.1em 0.3em; }

/* Editor: a transparent textarea over the highlighted code */

.editor {
  position: relative;
  height: 18rem;
  border: 1px solid var(--border);
  background: var(--code-bg);
}
.editor pre, .editor textarea {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0.75rem;
  overflow: auto;
  border: 0;
  font: 14px/1.5 var(--mono);
  tab-size: 4;
  white-space: pre;
  word-wrap: normal;
}
.editor pre { pointer-events: none; color: var(--text); }
.editor pre code { font: inherit; background: none; padding: 0; border-radius: 0; }
.editor textarea {
  width: 100%;
  height: 100%;
  resize: none;
  background: transparent;
  color: transparent;
  caret-color: var(--black);
  outline: none;
}
.editor:focus-within { border-color: #adb5bd; }
.editor textarea::selection { background: rgba(0, 0, 0, 0.12); }

.tok-keyword { color: var(--tok-keyword); }
.tok-string { color: var(--tok-string); }
.tok-number { color: var(--tok-number); }
.tok-constant { color: var(--tok-constant); }
.tok-comment { color: var(--tok-comment); font-style: italic; }
.tok-function { color: var(--tok-function); }
.tok-class { color: var(--tok-class); }
.tok-builtin { color: var(--tok-builtin); }
.tok-type { color: var(--tok-type); }

/* Toolbar and output */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 0.75rem 0;
  font-family: var(--ui);
}
.btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--black);
  border-radius: 0;
  background: var(--black);
  color: #fff;
  font: 0.9rem var(--ui);
  cursor: pointer;
}
.btn:hover { background: #23272b; }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn-outline { background: #fff; color: var(--black); }
.btn-outline:hover { background: var(--surface); }
.hint { color: var(--muted); font-size: 0.8rem; }
#status { color: var(--muted); font-size: 0.85rem; margin-left: auto; }

.output {
  min-height: 8rem;
  max-height: 24rem;
  overflow: auto;
  margin: 0;
  padding: 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: 14px/1.5 var(--mono);
  white-space: pre-wrap;
}
.output .error { color: var(--error); }
.output .note { color: var(--muted); }

footer {
  padding-bottom: 2rem;
  color: var(--muted);
  font: 0.8rem var(--ui);
}