/* lupp.us
 *
 * One stylesheet for every page. The nginx CSP is `style-src 'self'`, with no
 * `unsafe-inline`, so there are no <style> blocks and no style attributes
 * anywhere on the site: a state a page needs to show is a class it toggles.
 *
 * The palette follows the book's design contract (wolf-book
 * principles/DESIGN.md): a warm near-white ground, near-black serif text, one
 * measure, no decorative color. Color carries meaning here and nothing else,
 * which is why a diagnostic is the only red on the page.
 */

:root {
  --ink: #1a1a1a;
  --paper: #fbfaf8;
  --muted: #5a5a5a;
  --rule: #d8d4cc;
  --link: #6b2020;
  --code-bg: #f4f1ea;
  --bad: #8c2b18;
  --warn: #7a5a10;
  --good: #2c5530;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e6e1;
    --paper: #16161a;
    --muted: #a09a92;
    --rule: #34343c;
    --link: #d99a9a;
    --code-bg: #1d1d23;
    --bad: #e08c78;
    --warn: #d4b464;
    --good: #8fc196;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  max-width: 42rem;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 Charter, "Bitstream Charter", "Sitka Text", "Iowan Old Style", Georgia, serif;
}

/* The playground needs room the prose pages do not. */
body.wide { max-width: 60rem; }

header { border-bottom: 1px solid var(--rule); padding-bottom: 1rem; margin-bottom: 1.5rem; }
h1 { font-size: 2rem; margin: 0; letter-spacing: 0.02em; }
.sub { color: var(--muted); margin: 0.35rem 0 0; }
h2 { font-size: 1.1rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1rem; margin: 1.5rem 0 0.4rem; }
a { color: var(--link); }

code, pre, textarea, .mono {
  font-family: "Source Code Pro", "Iosevka", "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.9em;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.75rem 0.9rem;
  overflow-x: auto;
}
ul { padding-left: 1.2rem; }
li { margin: 0.25rem 0; }

/* Site navigation: one line, present on every page but the front. */
nav.site { margin: 0.6rem 0 0; font-size: 0.9rem; }
nav.site a { margin-right: 0.9rem; }

.aside {
  color: var(--muted);
  font-style: italic;
  border-top: 1px solid var(--rule);
  margin-top: 2.5rem;
  padding-top: 1rem;
}
footer {
  border-top: 1px solid var(--rule);
  margin-top: 2.5rem;
  padding-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* A definition list used as an index of files: term is a link, description is
 * one flat sentence about what the file is. */
dl.index { margin: 0.5rem 0; }
dl.index dt { margin-top: 0.9rem; font-weight: 600; }
dl.index dd { margin: 0.1rem 0 0 0; color: var(--muted); }

table { border-collapse: collapse; width: 100%; margin: 1rem 0; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 0.35rem 0.7rem 0.35rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; }

/* ------------------------------------------------------------------ */
/* the playground                                                      */
/* ------------------------------------------------------------------ */

.pad { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 60rem) {
  .pad { grid-template-columns: 1fr 1fr; }
}

.pane { min-width: 0; }
.pane > h2 { margin-top: 0; }

.bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0 0 0.6rem;
  font-size: 0.9rem;
}
.bar .spacer { flex: 1 1 auto; }

button, select {
  font: inherit;
  font-size: 0.9rem;
  color: var(--ink);
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.3rem 0.7rem;
}
button { cursor: pointer; }
button:hover:not(:disabled), select:hover { border-color: var(--ink); }
button:disabled { color: var(--muted); cursor: default; }
button.primary { font-weight: 600; }

kbd {
  font-family: inherit;
  font-size: 0.85em;
  color: var(--muted);
}

/* The editor: a textarea with a line-number gutter beside it. Both scroll as
 * one because the gutter mirrors the textarea's scrollTop. */
.editor {
  display: flex;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--code-bg);
  overflow: hidden;
}
.gutter {
  flex: 0 0 auto;
  padding: 0.7rem 0.5rem 0.7rem 0.7rem;
  margin: 0;
  border-right: 1px solid var(--rule);
  color: var(--muted);
  text-align: right;
  overflow: hidden;
  white-space: pre;
  user-select: none;
  font-size: 0.9em;
  line-height: 1.5;
  font-family: "Source Code Pro", ui-monospace, monospace;
}
#source {
  flex: 1 1 auto;
  min-width: 0;
  height: 26rem;
  padding: 0.7rem;
  border: 0;
  background: transparent;
  color: var(--ink);
  line-height: 1.5;
  resize: vertical;
  white-space: pre;
  overflow-wrap: normal;
  overflow: auto;
  tab-size: 4;
}
#source:focus { outline: 2px solid var(--link); outline-offset: -2px; }

/* Output blocks. Every one is empty until a run fills it, and an empty one is
 * hidden rather than left as a labelled void. */
.out { margin: 0 0 1rem; }
.out > h3 { margin: 0 0 0.3rem; }
.out pre { margin: 0; white-space: pre-wrap; word-break: break-word; }
.hidden { display: none; }

.verdict {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1rem;
  margin: 0 0 1rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--rule);
  border-left-width: 3px;
  border-radius: 3px;
  background: var(--code-bg);
  font-size: 0.9rem;
}
.verdict .v { font-weight: 600; font-family: "Source Code Pro", ui-monospace, monospace; }
.verdict .k { color: var(--muted); }
.verdict.ok { border-left-color: var(--good); }
.verdict.fault { border-left-color: var(--bad); }
.verdict.declined { border-left-color: var(--warn); }

/* The caret ruler under a diagnostic only lines up if the line is not wrapped. */
#out-span pre { white-space: pre; overflow-x: auto; word-break: normal; }

pre.diag { color: var(--bad); }
pre.warn { color: var(--warn); }
.note { color: var(--muted); font-size: 0.9rem; }

/* The banner the page shows when the interpreter could not be loaded, and the
 * one it shows while loading. Neither is decorative. */
.banner {
  margin: 0 0 1.5rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--warn);
  border-radius: 3px;
  background: var(--code-bg);
  font-size: 0.95rem;
}
.banner.broken { border-left-color: var(--bad); }
.banner p { margin: 0.4rem 0; }
.banner p:first-child { margin-top: 0; }
.banner p:last-child { margin-bottom: 0; }