/* SPDX-License-Identifier: MIT */
/* Copyright (c) 2026 P.O. Bolduc. See LICENSE-CODE. */
/* Pages of the website, in the manual's theme color (red!50!black). */

:root {
  --paper: #fbf9f4;
  --ink: #1f1c18;
  --muted: #6a645c;
  --rule: #e3ddd2;
  --theme: #800000;
  --theme-ink: #ffffff;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #161412;
    --ink: #ece7e0;
    --muted: #a49c92;
    --rule: #35302b;
    --theme: #e3928c;
    --theme-ink: #1a0f0e;
    color-scheme: dark;
  }
}

body {
  max-width: 46rem;
  margin: 0 auto;
  padding: 32px 16px 48px;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.55 "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}

a { color: var(--theme); }
h1, h2, h3 { line-height: 1.25; }
h1 { margin: 0; font-size: 2.2rem; }
h1 em { font-style: normal; color: var(--theme); }
h2 { margin: 40px 0 0; padding-bottom: 6px; border-bottom: 2px solid var(--theme); font-size: 1.4rem; }
h3 { margin: 20px 0 4px; font-size: 1.1rem; }

header { padding-bottom: 20px; border-bottom: 1px solid var(--rule); }
.reference, .note, .status, footer { color: var(--muted); }
.reference { margin: 6px 0 16px; }
.button {
  display: inline-block; padding: 6px 14px; border-radius: 6px;
  background: var(--theme); color: var(--theme-ink); text-decoration: none;
}
.note, .status { font-size: 0.9em; }
.progress { margin: 12px 0 0; font-weight: 600; }

.problems { list-style: none; margin: 0; padding: 0; }
.problems li { padding: 3px 0; }
.number { display: inline-block; min-width: 5.5rem; color: var(--ink); }
.problems a { text-decoration: none; }
.problems a:hover { text-decoration: underline; }
.todo a, .todo .number { color: var(--muted); }

.lead { margin: 12px 0 0; }

/* Problem pages */
.breadcrumb { margin-bottom: 16px; color: var(--muted); font-size: 0.9em; }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
h1 .label { display: block; margin-bottom: 4px; color: var(--theme); font-size: 1.1rem; }
.problem-page h1 { font-size: 1.9rem; }
.problem-page .actions { margin: 16px 0 0; }
.problem-page .actions > a:not(.button) { margin: 0 8px; }
/* Wider than the text column: the window width, centred, up to 80rem */
.viewer {
  display: block; position: relative; left: 50%; transform: translateX(-50%);
  width: min(calc(100vw - 32px), 80rem); height: calc(100vh - 32px); min-height: 600px;
  margin-top: 24px; border: 1px solid var(--rule); background: var(--paper);
}
.viewer p { padding: 16px; }

/* Phones: no embedded viewer (mobile browsers rarely show it), the PDF button
   above takes its place */
@media (max-width: 640px) {
  .viewer { display: none; }
  .problem-page .actions .button {
    display: block; margin-bottom: 8px; padding: 12px 14px; text-align: center;
  }
  .problem-page .actions > a:not(.button) { margin-left: 0; }
}
.parts { margin: 12px 0 0; }
.pager {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 16px;
  margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--rule);
}

footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--rule); font-size: 0.9em; }