/* ==================================================================
   Providentissimus Deus — reader edition
   Layout: [ TOC rail (left, sticky, collapsible) ]
           [ article: prose column + right margin sidenotes ]
           [ paragraph rail (right, fixed) ]
   <=1340px: rail becomes an off-canvas drawer with floating controls.
   ================================================================== */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500&family=Inter:wght@400;500;600&display=swap');

/* ---- theme tokens -------------------------------------------------- */

:root {
  --bg: #fdf6e3;
  --bg-alt: #f5ecd0;
  --bg-rail: #f8efd5;
  --ink: #1a1a1a;
  --ink-soft: #5b5b5b;
  --ink-faint: #8f8a78;
  --rule: #d9cfb1;
  --rule-soft: #e8dfc1;
  --accent: #7a3b1f;
  --accent-hover: #b35423;

  --serif: 'EB Garamond', 'Iowan Old Style', 'Palatino', Georgia, serif;
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;

  --measure: 36rem;
  --side:    clamp(10rem, calc(32vw - 12rem), 18rem);
  --gutter:  2.25rem;
  --toc-w:   15rem;
  --toc-w-collapsed: 11rem;
  --rail-w:  3.5rem;
}

html[data-theme="dark"] {
  --bg: #161614;
  --bg-alt: #1f1f1d;
  --bg-rail: #1c1c1a;
  --ink: #ece4cd;
  --ink-soft: #b2ad9a;
  --ink-faint: #7b7868;
  --rule: #3b362a;
  --rule-soft: #2b2820;
  --accent: #e2a679;
  --accent-hover: #ffc89b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Suppress per-element transitions for one paint while the palette swaps. */
html.theme-flipping,
html.theme-flipping *,
html.theme-flipping *::before,
html.theme-flipping *::after {
  transition: none !important;
}

body {
  display: grid;
  grid-template-columns: var(--toc-w) minmax(0, 1fr);
  align-items: start;
  min-height: 100vh;
  padding-right: var(--rail-w);
}

html[data-toc="collapsed"] body {
  grid-template-columns: var(--toc-w-collapsed) minmax(0, 1fr);
}

/* ==== TOC rail (left) ============================================== */

.toc-rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: transparent;
  border: 0;
}

.toc-head {
  padding: 1rem 0.75rem 0.75rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  gap: 0.4rem;
  align-items: center;
  justify-content: flex-start;
}
.toc-head .ctl-toggle {
  flex: 0 0 auto;
  width: 2rem;
  height: 2rem;
}

html[data-toc="collapsed"] .toc { display: none; }

.toc {
  flex: 1 1 0;
  min-height: 0;
  overflow-y: auto;
  padding: 0.25rem 1rem 1.5rem;
  font-family: var(--sans);
}
.toc::-webkit-scrollbar { width: 4px; }
.toc::-webkit-scrollbar-thumb { background: var(--rule-soft); border-radius: 2px; }
.toc::-webkit-scrollbar-track { background: transparent; }

.toc-top {
  display: block;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.25rem 0 0.9rem;
  margin-bottom: 0.4rem;
  border: 0;
}
.toc-top:hover { color: var(--accent); }

.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list li { margin: 0; }
.toc-list a {
  display: block;
  text-decoration: none;
  color: var(--ink-faint);
  padding: 0.18rem 0;
  font-size: 0.66rem;
  line-height: 1.35;
  transition: color 80ms;
  border: 0;
}
.toc-list a:hover { color: var(--accent); }

.toc-chapter { margin-top: 0.9rem; }
.toc-chapter:first-child { margin-top: 0; }
.toc-chapter > a {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  color: var(--ink-soft);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-size: 0.62rem;
  padding: 0.25rem 0;
}
.toc-roman {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-faint);
  flex-shrink: 0;
  min-width: 1.4rem;
  font-size: 0.72rem;
}
.toc-chapter > a:hover { color: var(--accent); }
.toc-chapter > a:hover .toc-roman { color: var(--accent); }
.toc-title { flex: 1; }
.toc-chapter.active > a { color: var(--accent); }
.toc-chapter.active > a .toc-roman { color: var(--accent); }

/* ==== floating mobile controls + scrim (compact only) ============= */

.mobile-controls { display: none; }
.scrim { display: none; }

/* ==== main page ==================================================== */

.page {
  padding: 4rem clamp(1.5rem, 4vw, 3rem) 8rem;
  min-width: 0;
}

article {
  max-width: calc(var(--measure) + var(--gutter) + var(--side));
  margin: 0 auto;
}

/* ---- masthead ----------------------------------------------------- */

.masthead {
  max-width: var(--measure);
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2rem;
}
.eyebrow {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}
.masthead h1 {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 3.2rem;
  line-height: 1.05;
  margin: 0 0 0.9rem;
  color: var(--ink);
}
.masthead h1 em { font-style: italic; }
.addressee {
  font-family: var(--serif);
  font-size: 1.05rem;
  color: var(--ink);
  margin: 0 0 0.5rem;
  line-height: 1.45;
}
.subtitle {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  max-width: 32rem;
  line-height: 1.35;
}
.source {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-faint);
}
.source a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
.source a:hover { color: var(--accent); border-color: var(--accent); }

/* ---- body --------------------------------------------------------- */

.body { max-width: var(--measure); }

.greeting {
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 2.2rem;
}

.chapter {
  font-family: var(--serif);
  font-weight: 500;
  text-align: center;
  margin: 5rem 0 2.5rem;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
}
.chapter:first-child { margin-top: 3rem; }
.chapter::before, .chapter::after {
  content: "";
  display: block;
  width: 3rem;
  height: 1px;
  background: var(--rule);
  margin: 0.6rem auto;
}
.chapter-label {
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
}
.chapter-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.2;
  font-weight: 500;
  letter-spacing: 0.01em;
  max-width: 28rem;
}

p.para {
  position: relative;
  margin: 0 0 1.2rem;
  hyphens: auto;
  -webkit-hyphens: auto;
  contain: layout style;
}
.paranum {
  position: absolute;
  left: -3rem;
  top: 0.1em;
  width: 2.2rem;
  text-align: right;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  user-select: none;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  transition: color 100ms;
}
.paranum:hover { color: var(--accent); }
.paranum.copied { color: var(--accent); }
.paranum.copied::after {
  content: "link copied";
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  margin-right: 0.4rem;
  padding: 0.15rem 0.4rem;
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  white-space: nowrap;
  pointer-events: none;
}
p.other { font-style: italic; color: var(--ink-soft); margin-top: 3rem; }
p.signature {
  text-align: center;
  font-family: var(--serif);
  font-size: 0.95rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--ink-soft);
  margin: 1.6rem 0 0;
}

/* ---- inline links ------------------------------------------------- */

article a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: color 80ms, border-color 80ms;
}
article a:hover { color: var(--accent); border-color: var(--accent); }

/* ==== sidenote markers (inline) ==================================== */

.sidenote-marker {
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 600;
  vertical-align: super;
  line-height: 0;
  margin: 0 0.05rem 0 0.05rem;
  cursor: pointer;
  color: var(--accent);
}

/* ==== sidenote bodies (right margin) =============================== */

.sidenote {
  float: right;
  clear: right;
  margin-right: calc(-1 * (var(--side) + var(--gutter)));
  width: var(--side);
  font-family: var(--serif);
  font-size: 0.82rem;
  line-height: 1.42;
  position: relative;
  margin-top: 0.3rem;
  margin-bottom: 0.6rem;
  padding-left: 0;
}
.sidenote.citation { color: var(--ink-soft); }
.sidenote i, .sidenote em { font-style: italic; }

.sn-label {
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 600;
  color: var(--accent);
  vertical-align: super;
  margin-right: 0.3rem;
  letter-spacing: 0.02em;
}

.sidenote a {
  color: inherit;
  border-bottom-color: var(--rule);
  word-wrap: break-word;
  overflow-wrap: break-word;
}
.sidenote a:hover { color: var(--accent); border-color: var(--accent); }

input.margin-toggle { display: none; }

/* ==== paragraph rail (right, fixed) =============================== */

.para-rail {
  position: fixed;
  right: 0.75rem;
  top: 1.5rem;
  bottom: 1.5rem;
  width: 2.6rem;
  z-index: 40;
  font-family: var(--sans);
  pointer-events: none;
}
.para-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.para-rail-list li {
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  position: relative;
}
.para-rail-list a {
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.35rem;
  width: 100%;
  height: 100%;
  text-decoration: none;
  color: var(--ink-faint);
  font-size: 0.58rem;
  letter-spacing: 0.02em;
  border: 0;
  padding-right: 0;
}
.para-rail-list a:hover { color: var(--accent); }
.para-rail-list a::after {
  content: "";
  display: block;
  width: 0.45rem;
  height: 1px;
  background: var(--rule);
  transition: width 100ms ease, background 100ms ease;
}
.para-rail-list a:hover::after { width: 0.9rem; background: var(--accent); }
.para-rail-list .num { display: none; }
.para-rail-list li.label .num,
.para-rail-list li.chapter-start .num {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}
.para-rail-list li.chapter-start a { color: var(--ink); font-weight: 600; }
.para-rail-list li.chapter-start .num {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
}
.para-rail-list li.chapter-start a::after { width: 0.85rem; background: var(--ink); }
.para-rail-list li.active a { color: var(--accent); }
.para-rail-list li.active a::after { background: var(--accent); width: 0.7rem; }
.para-rail-list li.active.label .num,
.para-rail-list li.active.chapter-start .num { color: var(--accent); }
.para-rail-list li.active .num {
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

/* ==== shared toggle button ========================================= */

.ctl-toggle {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
  transition: background 120ms, color 120ms, border-color 120ms;
  padding: 0;
}
.ctl-toggle:hover { color: var(--accent); border-color: var(--accent); }
.ctl-toggle .ico {
  display: block;
  width: 1.05em;
  height: 1.05em;
  flex-shrink: 0;
}

.theme-icon { font-size: 0.95rem; line-height: 1; }
.theme-icon-dark { display: none; }
html[data-theme="dark"] .theme-icon-light { display: none; }
html[data-theme="dark"] .theme-icon-dark { display: inline; }

/* ==== responsive =================================================== */

@media (max-width: 1340px) {
  body { padding-right: 0; grid-template-columns: minmax(0, 1fr); }
  html[data-toc="collapsed"] body { grid-template-columns: minmax(0, 1fr); }
  html[data-toc="expanded"] body { overflow: hidden; }  /* scroll lock */

  .para-rail { display: none; }

  /* rail -> off-canvas drawer */
  .toc-head { display: none; }
  .toc-rail {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    height: 100vh;
    width: min(20rem, 84vw);
    z-index: 75;
    background: var(--bg);
    border-right: 1px solid var(--rule);
    transform: translateX(-105%);
    transition: transform 260ms cubic-bezier(0.32, 0.72, 0.28, 1);
    box-shadow: none;
  }
  html[data-toc="expanded"] .toc-rail {
    transform: none;
    box-shadow: 18px 0 50px rgba(0, 0, 0, 0.22);
  }
  .toc { display: block; padding: 4.9rem 1.15rem 1.5rem; }

  /* floating control pill */
  .mobile-controls {
    display: flex;
    gap: 0.4rem;
    position: fixed;
    top: 0.8rem;
    left: 0.8rem;
    z-index: 80;
    padding: 0.3rem;
    border-radius: 999px;
    background: var(--bg);
    border: 1px solid var(--rule);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.14);
  }

  .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 70;
    background: rgba(10, 9, 7, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease;
  }
  html[data-toc="expanded"] .scrim { opacity: 1; pointer-events: auto; }

  .page { padding-top: 4.9rem; }

  /* Sidenotes inline, click-to-expand */
  .paranum {
    position: static;
    display: inline;
    margin-right: 0.5rem;
    color: var(--accent);
  }
  .paranum.copied::after { display: none; }
  .sidenote {
    display: none;
    float: none;
    clear: both;
    width: auto;
    margin: 0.6rem 0 1rem 0;
    padding: 0.6rem 0.8rem;
    background: var(--bg-alt);
    border-left: 2px solid var(--rule);
    font-size: 0.85rem;
  }
  .margin-toggle:checked + .sidenote { display: block; }
  .sidenote-marker {
    border: 1px solid currentColor;
    border-radius: 0.6rem;
    padding: 0 0.3rem;
    line-height: 1;
    font-size: 0.58rem;
  }
}

@media (max-width: 700px) {
  .page { padding: 4.9rem 1.25rem 6rem; }
  .masthead h1 { font-size: 2.3rem; }
  .subtitle { font-size: 1.05rem; }
  html, body { font-size: 18px; }
}

/* ==== print ======================================================== */

@media print {
  :root { --bg: #fff; --ink: #000; }
  .toc-rail, .para-rail, .mobile-controls, .scrim { display: none; }
  body { grid-template-columns: 1fr; }
  .sidenote { float: none; width: auto; margin: 0.4rem 0; font-size: 0.75rem; }
}