/* Shared by every page: colour tokens, the site header and nav, the page container and the
   generic ui- components (toolbar, fields, buttons, table of contents, sections).
   Colour pairs are chosen for WCAG 2.2 AA (>= 4.5:1 for text on --esr-surface
   and --esr-bg, >= 3:1 for borders/focus on interactive controls). */

:root {
  --esr-bg: #000;
  --esr-surface: #15110d;
  --esr-surface-2: #1f1912;
  --esr-border: #4a3622;
  --esr-border-strong: #8a6236;
  --esr-text: #ece6dc;
  --esr-muted: #bdb2a2;
  --esr-accent: #f2a94e;
  --esr-link: #f7c27a;
  --esr-focus: #ffd38a;
  --esr-mod: #a3a8ff;
  --esr-q-uni: #d6c08a;
  --esr-q-set: #5fdc5f;
  --esr-q-rar: #f5f07a;
  --esr-q-mag: #a3a8ff;
  --esr-q-crf: #ffb347;
  --esr-q-rune: #ffb347;
  --esr-q-low: #b8b8b8;
  --esr-radius: 6px;
  --esr-font: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  --esr-serif: "Palatino Linotype", Palatino, "Book Antiqua", serif;
}

@media (prefers-contrast: more) {
  :root {
    --esr-border: #b08a5a;
    --esr-muted: #ddd3c4;
    --esr-surface: #000;
    --esr-surface-2: #0d0d0d;
  }
}

/* ---------- page ---------- */

html { background: var(--esr-bg); }
body {
  margin: 0;
  background: var(--esr-bg);
  color: var(--esr-text);
  font: 1rem/1.55 var(--esr-font);
}

.site-header {
  text-align: center;
  padding: 0.75rem 1rem 0;
  margin: 0 0 1rem;
  background:
    radial-gradient(ellipse 60% 110% at 50% 118%, rgba(255, 120, 20, 0.26) 0%, rgba(0, 0, 0, 0) 70%),
    linear-gradient(180deg, #0a0603 0%, #170c05 100%);
  border-bottom: 1px solid #3a1e0a;
}
.site-header .site-name {
  margin: 0;
  font-family: var(--esr-serif);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--esr-accent);
}
.site-header .site-tagline {
  margin: 0.25rem 0 0;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--esr-muted);
}

/* nav (filled in by assets/site-nav.js) */
.site-nav { margin-top: 0.5rem; }
.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  display: inline-block;
  min-height: 2.75rem;
  box-sizing: border-box;
  padding: 0.6rem 0.9rem 0.45rem;
  color: var(--esr-link);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 3px solid transparent;
}
.site-nav a:hover { color: var(--esr-focus); border-bottom-color: var(--esr-border-strong); }
.site-nav a[aria-current="page"] { color: var(--esr-text); border-bottom-color: var(--esr-accent); }
.site-nav a:focus-visible { outline: 3px solid var(--esr-focus); outline-offset: -3px; }

.page {
  display: block;
  box-sizing: border-box;
  width: 100%;
  max-width: 72rem;
  margin: 0 auto 4rem;
  padding: 0 1rem;
  text-align: left;
  font: 1rem/1.55 var(--esr-font);
  color: var(--esr-text);
}
.page *, .page *::before, .page *::after { box-sizing: border-box; }

.page a { color: var(--esr-link); text-underline-offset: 0.15em; }
.page a:hover { color: var(--esr-focus); }
.page :focus-visible {
  outline: 3px solid var(--esr-focus);
  outline-offset: 2px;
}

/* ---------- shared components ---------- */

.ui-skip {
  position: absolute;
  left: -9999px;
}
.ui-skip:focus {
  position: static;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.ui-title {
  font-family: var(--esr-serif);
  font-size: 1.9rem;
  color: var(--esr-accent);
  margin: 0.5rem 0 0.25rem;
  letter-spacing: 0.02em;
}
.ui-meta { color: var(--esr-muted); font-size: 0.9rem; margin: 0 0 1rem; }

.ui-notes {
  background: var(--esr-surface);
  border: 1px solid var(--esr-border);
  border-left: 4px solid var(--esr-accent);
  border-radius: var(--esr-radius);
  padding: 0.75rem 1rem 0.75rem 2rem;
  margin: 0 0 1.25rem;
}
.ui-notes li + li { margin-top: 0.35rem; }

/* toolbar */
.ui-toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: minmax(14rem, 2fr) repeat(3, minmax(9rem, 1fr));
  gap: 0.75rem;
  align-items: end;
  padding: 0.75rem;
  margin: 0 0 0.5rem;
  background: var(--esr-surface-2);
  border: 1px solid var(--esr-border);
  border-radius: var(--esr-radius);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.6);
}
.ui-field { display: flex; flex-direction: column; gap: 0.25rem; min-width: 0; }
.ui-field label { font-size: 0.875rem; color: var(--esr-muted); font-weight: 600; }
.ui-field kbd {
  font: inherit;
  font-size: 0.8rem;
  border: 1px solid var(--esr-border-strong);
  border-radius: 3px;
  padding: 0 0.3rem;
  margin-left: 0.25rem;
}
.ui-field input,
.ui-field select {
  font: inherit;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.4rem 0.6rem;
  color: var(--esr-text);
  background: #0b0907;
  border: 1px solid var(--esr-border-strong);
  border-radius: var(--esr-radius);
}
.ui-field input::placeholder { color: #9d927f; }

.ui-status {
  margin: 0.25rem 0 1rem;
  color: var(--esr-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
}
.ui-btn {
  font: inherit;
  font-size: 0.95rem;
  min-height: 2.5rem;
  padding: 0.3rem 0.9rem;
  color: var(--esr-text);
  background: var(--esr-surface-2);
  border: 1px solid var(--esr-border-strong);
  border-radius: var(--esr-radius);
  cursor: pointer;
}
.ui-btn:hover { border-color: var(--esr-accent); }

/* table of contents */
.ui-toc {
  margin: 0 0 1.5rem;
  background: var(--esr-surface);
  border: 1px solid var(--esr-border);
  border-radius: var(--esr-radius);
}
.ui-toc summary {
  cursor: pointer;
  padding: 0.6rem 1rem;
  font-weight: 600;
  min-height: 2.5rem;
}
.ui-toc ul {
  list-style: none;
  margin: 0;
  padding: 0 1rem 0.75rem;
  columns: 14rem auto;
  column-gap: 1.5rem;
}
.ui-toc li { padding: 0.15rem 0; break-inside: avoid; }
.ui-toc .ui-count { color: var(--esr-muted); font-size: 0.85rem; }

/* sections */
.ui-section { margin: 0 0 2.5rem; scroll-margin-top: 7rem; }
.ui-section > h2 {
  font-family: var(--esr-serif);
  font-size: 1.5rem;
  color: var(--esr-accent);
  margin: 0 0 0.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--esr-border-strong);
}
.ui-intro { color: var(--esr-text); margin: 0 0 1rem; max-width: 65rem; }

.ui-empty, .ui-missing {
  padding: 1.5rem;
  text-align: center;
  background: var(--esr-surface);
  border: 1px solid var(--esr-border);
  border-radius: var(--esr-radius);
}
.ui-missing code { color: var(--esr-accent); }

/* ---------- scroll jumps (assets/site-nav.js) ---------- */

.ui-jump {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 10;
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
  font: 0.95rem/1.4 var(--esr-font);
}
.ui-jump[hidden], .ui-rail[hidden], .ui-jump [hidden] { display: none; }
.ui-jump button {
  font: inherit;
  font-weight: 600;
  min-height: 2.75rem;
  min-width: 2.75rem;
  padding: 0.55rem 0.9rem;
  color: var(--esr-text);
  background: var(--esr-surface-2);
  border: 1px solid var(--esr-border-strong);
  border-radius: var(--esr-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.7);
  cursor: pointer;
}
.ui-jump button:hover { border-color: var(--esr-accent); color: var(--esr-focus); }
.ui-jump :focus-visible, .ui-rail :focus-visible { outline: 3px solid var(--esr-focus); outline-offset: 2px; }
.ui-jump-menu { position: relative; }
.ui-jump-menu > button::after { content: " \25B4"; color: var(--esr-muted); }
.ui-jump-menu > button[aria-expanded="true"]::after { content: " \25BE"; }
.ui-jump-menu nav {
  position: absolute;
  right: 0;
  bottom: calc(100% + 0.4rem);
  width: max-content;
  max-width: calc(100vw - 2rem);
  max-height: 60vh;
  overflow: auto;
  background: var(--esr-surface-2);
  border: 1px solid var(--esr-border-strong);
  border-radius: var(--esr-radius);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.8);
}

.ui-jump ul, .ui-rail ul { list-style: none; margin: 0; padding: 0.3rem 0; }
.ui-jump a, .ui-rail a {
  display: block;
  padding: 0.4rem 0.9rem;
  color: var(--esr-link);
  text-decoration: none;
  border-left: 3px solid transparent;
}
.ui-jump a:hover, .ui-rail a:hover { color: var(--esr-focus); text-decoration: underline; }
.ui-jump a[aria-current], .ui-rail a[aria-current] {
  color: var(--esr-text);
  font-weight: 600;
  border-left-color: var(--esr-accent);
}

/* the rail sits in the right margin when it's wide enough (.page is 72rem) */
.ui-rail { display: none; }
@media (min-width: 96rem) {
  .ui-rail {
    display: block;
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 10;
    width: min(14rem, calc(50vw - 37rem));
    max-height: calc(100vh - 6rem);
    overflow: auto;
    font: 0.9rem/1.4 var(--esr-font);
    background: var(--esr-surface);
    border: 1px solid var(--esr-border);
    border-radius: var(--esr-radius);
  }
  .ui-rail a { padding: 0.3rem 0.75rem; }
  .ui-rail-title {
    margin: 0;
    padding: 0.5rem 0.75rem 0.1rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--esr-muted);
  }
  .ui-jump-menu { display: none; }
}

@media print {
  .ui-jump, .ui-rail { display: none !important; }
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .ui-toolbar { grid-template-columns: 1fr 1fr; position: static; }
  .ui-toolbar .ui-field:first-child { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .ui-toolbar { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: no-preference) {
  html:focus-within { scroll-behavior: smooth; }
}