/* Plots with ROOTs: loaded after the reveal.js "white" theme (#+REVEAL_EXTRA_CSS).
   Canvas 1280 x 720, slides centred by reveal itself. Everything below uses
   normal document flow: no absolute positioning, no forced heights. */

:root {
  --ink:    #16191d;
  --muted:  #5e656e;
  --faint:  #dfe3e8;
  --paper:  #ffffff;
  --accent: #14507d;       /* the survivors' blue in every figure */
  --accent-soft: #eef3f8;
  --warm:   #b8641c;       /* "what you still have to do" */
  --warm-soft: #fbf5ef;
  --text: "Helvetica Neue", "TeX Gyre Heros", Helvetica, Arial, sans-serif;
  --mono: "SF Mono", Menlo, Consolas, "TeX Gyre Cursor", monospace;

  /* reveal.js theme variables */
  --r-background-color: var(--paper);
  --r-main-font: var(--text);
  --r-main-font-size: 28px;
  --r-main-color: var(--ink);
  --r-block-margin: 18px;
  --r-heading-font: var(--text);
  --r-heading-color: var(--ink);
  --r-heading-font-weight: 700;
  --r-heading-line-height: 1.08;
  --r-heading-letter-spacing: -0.015em;
  --r-heading-text-transform: none;
  --r-heading-text-shadow: none;
  --r-heading-margin: 0 0 28px 0;
  --r-heading2-size: 50px;
  --r-heading3-size: 22px;
  --r-code-font: var(--mono);
  --r-link-color: var(--accent);
  --r-link-color-hover: var(--accent);
  --r-selection-background-color: #cfe0ee;
}

.reveal .slides { text-align: left; }
.reveal .slides > section { box-sizing: border-box; padding: 0 50px; }
.reveal .slides section { line-height: 1.35; }

.reveal h2 { font-size: 50px; margin: 0 0 28px; max-width: 1120px; }
.reveal h3 { font-size: 23px; margin: 0 0 14px; }
.reveal p  { margin: 0 0 18px; }
.reveal b, .reveal strong { font-weight: 700; }

/* ---------- title ---------- */
.reveal section.title h2 { font-size: 104px; letter-spacing: -0.03em; margin-bottom: 30px; }
.reveal section.title h2::before {
  content: ""; display: block; width: 120px; height: 8px;
  background: var(--accent); margin-bottom: 36px;
}
.reveal .thesis { font-size: 36px; line-height: 1.3; color: var(--muted); max-width: 900px; }
.reveal .author { display: block; font-size: 26px; color: var(--muted); margin-top: 44px; }

/* ---------- statement ---------- */
.reveal section.statement h2 { font-size: 64px; max-width: 1040px; }
.reveal .lede { font-size: 32px; line-height: 1.35; color: var(--muted); max-width: 980px; }
.reveal .lede.small { font-size: 28px; color: var(--ink); }
.reveal .caption { font-size: 21px; color: var(--muted); margin-top: 22px; }

/* ---------- ROOT letter in a heading ---------- */
.reveal h2 .letter {
  display: inline-block; width: 64px; height: 64px; line-height: 64px;
  margin-right: 22px; vertical-align: 4px;
  text-align: center; font-size: 40px; font-weight: 700;
  color: var(--paper); background: var(--accent);
}
.reveal section.root-q h2 { font-size: 44px; }

/* ---------- the four questions ---------- */
.reveal .root-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px 28px; max-width: 1120px;
}
.reveal .root-grid > div {
  background: var(--accent-soft); border-left: 5px solid var(--accent);
  padding: 18px 22px 16px 22px;
}
.reveal .root-grid .big {
  display: block; font-size: 54px; line-height: 1; font-weight: 700; color: var(--accent);
  margin-bottom: 6px;
}
.reveal .root-grid b { display: block; font-size: 29px; margin-bottom: 4px; }
.reveal .root-grid p { font-size: 24px; line-height: 1.3; margin: 0; color: var(--muted); }
.reveal .root-grid.compact > div { display: flex; align-items: center; gap: 20px; padding: 14px 20px; }
.reveal .root-grid.compact .big { font-size: 44px; margin: 0; }
.reveal .root-grid.compact p { color: var(--ink); font-size: 26px; }
.reveal section.closing h2 { font-size: 42px; }

/* ---------- gives / yours ---------- */
.reveal .split {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 36px; max-width: 1180px;
}
.reveal .split > div { padding: 20px 26px 12px; }
.reveal .split .gives { border-top: 5px solid var(--accent); background: var(--accent-soft); }
.reveal .split .yours { border-top: 5px solid var(--warm); background: var(--warm-soft); }
.reveal .split .gives h3 { color: var(--accent); }
.reveal .split .yours h3 { color: var(--warm); }
.reveal .split ul, .reveal ul.plain {
  display: block; margin: 0; padding: 0; list-style: none;
}
.reveal .split li {
  font-size: 25px; line-height: 1.3; margin: 0 0 13px; padding-left: 22px; position: relative;
}
.reveal .split li::before {
  content: ""; position: absolute; left: 0; top: 0.55em;
  width: 10px; height: 3px; background: currentColor; opacity: 0.45;
}

/* ---------- code beside figure ---------- */
.reveal .pair {
  display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 36px; align-items: center; max-width: 1180px;
}
.reveal pre, .reveal pre.code {
  width: auto; margin: 0; box-shadow: none; text-align: left;
  font-family: var(--mono); font-size: 22px; line-height: 1.45;
  background: #f5f7f9; border-left: 4px solid var(--accent);
  padding: 18px 22px; white-space: pre-wrap; word-wrap: normal; color: var(--ink);
}
.reveal pre code { background: none; padding: 0; max-height: none; font-size: inherit; }
.reveal pre span { background: none; }
.reveal pre .del { color: #9c3524; text-decoration: line-through; opacity: 0.8; }
.reveal pre .add { color: #1f6f3f; font-weight: 700; }
.reveal pre.diff { font-size: 26px; max-width: 900px; margin-bottom: 26px; }

.reveal figure { margin: 0; }
.reveal figure img {
  display: block; margin: 0; width: 100%; height: auto; max-height: 400px;
  object-fit: contain; background: var(--paper); border: 1px solid var(--faint);
}
.reveal figcaption { font-size: 17px; color: var(--muted); margin-top: 8px; }

/* ---------- gallery ---------- */
.reveal .grid4 {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px 30px; max-width: 1120px;
}
.reveal .grid4 img { height: 232px; max-height: none; }
.reveal .grid4 figcaption { font-size: 18px; color: var(--ink); font-weight: 700; margin-top: 6px; }
.reveal section.gallery h2 { font-size: 40px; margin-bottom: 18px; }

/* ---------- workflow ---------- */
.reveal .flow {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 10px 0 40px;
}
.reveal .flow span {
  font-size: 24px; font-weight: 700; padding: 12px 18px;
  border: 2px solid var(--accent); color: var(--accent); background: var(--accent-soft);
}
.reveal .flow i { font-style: normal; font-size: 28px; color: var(--muted); }

/* ---------- limits ---------- */
.reveal ul.plain li {
  font-size: 26px; line-height: 1.35; margin: 0 0 16px;
  padding-left: 18px; border-left: 4px solid var(--faint);
}
.reveal ul.plain b { color: var(--accent); }
.reveal section.limits .lede.small { margin-top: 28px; font-weight: 700; }

/* ---------- live ---------- */
.reveal .tag {
  display: inline-block; font-family: var(--mono); font-size: 16px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--paper); background: var(--warm);
  padding: 4px 12px; margin-bottom: 16px;
}

/* ---------- table ---------- */
.reveal table { margin: 0; border-collapse: collapse; width: 100%; max-width: 1140px; }
.reveal table th, .reveal table td {
  text-align: left; vertical-align: top; font-size: 24px; line-height: 1.3;
  padding: 14px 24px 14px 0; border: 0; border-bottom: 1px solid var(--faint);
}
.reveal table th { font-size: 18px; color: var(--muted); font-weight: 700; }
.reveal table td:first-child { width: 46%; }

/* ---------- reveal chrome ---------- */
.reveal .progress { height: 4px; color: var(--accent); }
.reveal .controls { color: var(--accent); }
.reveal .slide-number {
  background: transparent; color: var(--muted); font-family: var(--mono); font-size: 14px;
}