/*
 * HCE Riders Guide — self-hosted stylesheet.
 * Replaces the CDN-hosted readtheorg/htmlize theme + jQuery/Bootstrap. No
 * external requests, no JS dependency for anything but the ToC panel.
 * Written for org-mode's default HTML export (ox-html) structure.
 */

:root {
  --bg: #ffffff;
  --bg-alt: #f4f6f9;
  --fg: #1f2937;
  --fg-muted: #5b6472;
  --border: #dde2e8;
  --accent: #1a5fa8;
  --accent-dark: #124674;
  --accent-contrast: #ffffff;
  --code-bg: #eef1f4;
  --shadow: rgba(20, 30, 45, 0.14);

  --note-line: #1a5fa8;
  --note-bg: #eaf2fb;
  --tip-line: #0f8f6f;
  --tip-bg: #e7f7f1;
  --warning-line: #b9781a;
  --warning-bg: #fbf1e0;
  --attention-line: #d9611e;
  --attention-bg: #fdf0e7;
  --important-line: #c0392b;
  --important-bg: #fbe9e7;
  --updates-line: #5b4b9c;
  --updates-bg: #f0edf9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d;
    --bg-alt: #1b2129;
    --fg: #e6e9ed;
    --fg-muted: #9aa4b2;
    --border: #2b333d;
    --accent: #6fa8dc;
    --accent-dark: #9cc4ea;
    --accent-contrast: #0b1117;
    --code-bg: #1e252d;
    --shadow: rgba(0, 0, 0, 0.4);

    --note-line: #6fa8dc;
    --note-bg: #182634;
    --tip-line: #3fbf98;
    --tip-bg: #122a24;
    --warning-line: #d9a441;
    --warning-bg: #2c2413;
    --attention-line: #e8814a;
    --attention-bg: #2c1f14;
    --important-line: #e0685a;
    --important-bg: #2c1917;
    --updates-line: #a696e0;
    --updates-bg: #201c30;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

#content {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 18px 48px;
}

h1.title {
  font-size: 1.7em;
  line-height: 1.25;
  margin: 20px 0 8px;
  color: var(--accent-dark);
  text-wrap: balance;
}

h2, h3, h4, h5, h6 {
  color: var(--accent-dark);
  line-height: 1.3;
  text-wrap: balance;
  scroll-margin-top: 56px; /* clears the sticky ToC bar when jumped to */
}

h2 { font-size: 1.35em; margin: 1.6em 0 0.5em; }
h3 { font-size: 1.15em; margin: 1.4em 0 0.4em; }
h4 { font-size: 1.05em; margin: 1.2em 0 0.4em; }

p { margin: 0.8em 0; }

a { color: var(--accent); text-decoration-thickness: 1px; }
a:hover, a:active { color: var(--accent-dark); }

ul.org-ul, ol.org-ol { padding-left: 1.3em; }
ul.org-ul li, ol.org-ol li { margin: 0.35em 0; }

img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.figure { margin: 1em 0; text-align: center; }
.figure p { margin: 0; }

hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

/* Inline code / verbatim — wraps like normal text instead of running off
   the screen. (readtheorg's original CSS set white-space:nowrap on an
   inline element, which can't scroll and just overflows the viewport.) */
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
}

pre {
  background: var(--code-bg);
  padding: 12px 14px;
  border-radius: 6px;
  overflow-x: auto;
  max-width: 100%;
}
pre code { background: none; padding: 0; }

/* Tables — display:block lets a wide table scroll horizontally in its own
   box instead of forcing the whole page wider than the viewport. */
table {
  display: block;
  overflow-x: auto;
  max-width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  font-size: 0.95em;
}
caption { caption-side: top; text-align: left; color: var(--fg-muted); font-style: italic; margin-bottom: 4px; }
th, td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}
th { background: var(--bg-alt); }
tbody tr:nth-child(even) { background: var(--bg-alt); }

/* Callout blocks: #+begin_note / tip / warning / attention / important.
   Label is pure CSS (::before) so it renders even if JS never runs. */
.note, .tip, .warning, .attention, .important, .recentupdates {
  margin: 1.2em 0;
  padding: 12px 14px;
  border-left: 4px solid;
  border-radius: 4px;
}
.note p:last-child, .tip p:last-child, .warning p:last-child,
.attention p:last-child, .important p:last-child, .recentupdates p:last-child { margin-bottom: 0; }

.note::before, .tip::before, .warning::before, .attention::before,
.important::before, .recentupdates::before {
  display: block;
  font-size: 0.78em;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.note { border-color: var(--note-line); background: var(--note-bg); }
.note::before { content: "Note"; color: var(--note-line); }

.tip { border-color: var(--tip-line); background: var(--tip-bg); }
.tip::before { content: "Tip"; color: var(--tip-line); }

.warning { border-color: var(--warning-line); background: var(--warning-bg); }
.warning::before { content: "Warning"; color: var(--warning-line); }

.attention { border-color: var(--attention-line); background: var(--attention-bg); }
.attention::before { content: "Attention"; color: var(--attention-line); }

.important { border-color: var(--important-line); background: var(--important-bg); }
.important::before { content: "Important"; color: var(--important-line); }

/* "Recent Updates" box at the top of the guide. */
.recentupdates { border-color: var(--updates-line); background: var(--updates-bg); }
.recentupdates::before { content: "Recent Updates"; color: var(--updates-line); }
.recentupdates ul { margin: 0; padding-left: 1.2em; }
.recentupdates li { margin: 0.5em 0; }
.recentupdates .update-date {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--updates-line);
}

/* Table of contents — a full-screen off-canvas panel, opened by a sticky
   bar at the top of the content. Pure CSS/vanilla-JS toggle, no jQuery. */
#toc-toggle {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin: 0 -18px;
  padding: 10px 18px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
  cursor: pointer;
  border: none;
  width: calc(100% + 36px);
  text-align: left;
  font-size: 0.95em;
  box-shadow: 0 1px 4px var(--shadow);
}
#toc-toggle:after { content: "\2261"; font-size: 1.3em; line-height: 1; }

#table-of-contents {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: var(--bg);
  overflow-y: auto;
  padding: 16px 20px 40px;
  transform: translateX(-100%);
  transition: transform 0.2s ease;
}
body.toc-open #table-of-contents { transform: translateX(0); }

#table-of-contents h2 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0;
  font-size: 1.2em;
}
#toc-close {
  font-size: 0.7em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  cursor: pointer;
  background: var(--bg-alt);
}

#text-table-of-contents ul { list-style: none; padding-left: 1.1em; margin: 0; }
#text-table-of-contents > ul { padding-left: 0; }
#text-table-of-contents li { margin: 0.5em 0; }
#text-table-of-contents a { text-decoration: none; color: var(--fg); }
#text-table-of-contents a:hover { color: var(--accent); }

/* Footer */
#postamble {
  margin-top: 3em;
  padding-top: 1em;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 0.85em;
}
#postamble p { margin: 0.2em 0; }
#postamble .validation { display: none; }

@media (min-width: 820px) {
  body { font-size: 18px; }
  #toc-toggle { display: none; }
  #table-of-contents {
    position: static;
    transform: none;
    inset: auto;
    z-index: auto;
    padding: 0 0 24px;
    background: transparent;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
  }
  #toc-close { display: none; }
}