/* Trail of Bits presentation layer, adapted from
   /Users/marcilunga/Documents/tob/tangerine/presentation/tob-slides.css.

   Tangerine is authored for 1280 × 720.  This deck keeps the same geometry
   and rhythm on a 1600 × 900 logical canvas by scaling the fixed measurements
   by 1.25.  CBC- and informalization-specific geometry remains in custom.css
   and draft-talk.css. */

@font-face {
  font-family: "FH Lecturis";
  src: url("static/fonts/FHLecturis-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist";
  src: url("static/fonts/Geist-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Geist Mono";
  src: url("static/fonts/GeistMono-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --tob-slide-width: 1600px;
  --tob-slide-height: 900px;
  --tob-slide-gutter: 80px;
  --tob-slide-pad-top: 65px;
  --tob-slide-pad-bottom: 60px;
  --tob-canvas: #fafafa;
  --tob-surface: #ffffff;
  --tob-muted: #f2f2f2;
  --tob-ink: #181717;
  --tob-ink-muted: #4a4b4d;
  --tob-line: #dbdbdb;
  --tob-accent: #d00000;
  --tob-accent-strong: #a20000;
  --tob-dark: #0f1011;
  --tob-dark-surface: #1d1f23;
  --tob-chalk: #fafafa;

  /* Compatibility aliases used by the existing CBC visual layer. */
  --tob-red: var(--tob-accent);
  --tob-red-strong: var(--tob-accent-strong);
  --lean-teal: var(--tob-accent);
  --lean-blue: var(--tob-ink);
  --text-dark: var(--tob-ink);
  --text-muted: #64748b;
  --bg-code: #f8fafc;
  --border-code: #e2e8f0;

  --r-background-color: var(--tob-canvas);
  --r-main-font: "Geist", ui-sans-serif, system-ui, sans-serif;
  --r-main-font-size: 31px;
  --r-main-color: var(--tob-ink);
  --r-heading-font: "FH Lecturis", "Geist", sans-serif;
  --r-heading-color: var(--tob-ink);
  --r-heading-font-weight: 400;
  --r-heading-text-transform: none;
  --r-heading-letter-spacing: -0.025em;
  --r-heading-line-height: 1.02;
  --r-link-color: var(--tob-accent-strong);
  --r-link-color-hover: var(--tob-accent);
  --r-selection-background-color: var(--tob-accent);
}

html,
body,
.reveal-viewport {
  width: 100%;
  height: 100%;
  min-height: 100%;
  background: var(--tob-canvas);
}

.reveal-viewport { overflow: hidden; }

.reveal {
  width: 100%;
  height: 100%;
  color: var(--tob-ink);
  font-family: var(--r-main-font);
  font-feature-settings: "cv02", "cv03", "cv04", "cv11", "ss01";
  font-size: var(--r-main-font-size);
  font-weight: 400;
}

.reveal .slides { text-align: left; }

:is(.reveal .slides > section, .reveal .slides > .pdf-page > section) {
  box-sizing: border-box;
  width: 100%;
  height: var(--tob-slide-height);
  padding: var(--tob-slide-pad-top) var(--tob-slide-gutter) var(--tob-slide-pad-bottom);
  text-align: left;
}

:is(.reveal .slides > section, .reveal .slides > .pdf-page > section)::before {
  position: absolute;
  top: 31px;
  left: var(--tob-slide-gutter);
  width: 58px;
  height: 4px;
  content: "";
  background: var(--tob-accent);
}

:is(.reveal .slides > section, .reveal .slides > .pdf-page > section)::after {
  position: absolute;
  right: 175px;
  bottom: 34px;
  width: 76px;
  height: 46px;
  content: "";
  background: url("static/images/brand/tob-primary.svg") center / contain no-repeat;
  filter: brightness(0);
  opacity: 0.9;
}

.reveal h2 {
  max-width: 1360px;
  margin: 0 0 30px;
  padding: 0;
  border: 0;
  color: var(--tob-ink);
  font-family: var(--r-heading-font);
  font-size: 61px;
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

/* custom.css previously drew a full-width rule under every heading.  The
   Tangerine system uses the short registration mark above instead. */
.reveal .slides section > h2,
.reveal .slides section:not([data-background-color]) > h2 {
  padding-bottom: 0;
  border-bottom: 0;
}

.reveal h3 {
  margin: 0 0 24px;
  color: var(--tob-ink-muted);
  font-family: var(--r-main-font);
  font-size: 30px;
  font-weight: 450;
  line-height: 1.15;
}

.reveal p {
  margin: 0 0 0.55em;
  font-size: 1em;
  font-weight: 400;
  line-height: 1.28;
}

.reveal p,
.reveal li,
.reveal th,
.reveal td { overflow-wrap: break-word; }

.reveal strong { color: inherit; font-weight: 700; }
.reveal em { color: inherit; }

.reveal ul,
.reveal ol {
  display: block;
  margin: 0.3em 0 0.55em 1.05em;
}

.reveal li {
  margin: 0 0 0.28em;
  padding-left: 0.16em;
  line-height: 1.23;
}

.reveal li::marker { color: var(--tob-accent); }

.reveal a {
  color: var(--tob-accent-strong);
  font-weight: 600;
}

.reveal code {
  border-radius: 2px;
  background: var(--tob-muted);
  color: var(--tob-ink);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 0.88em;
}

.reveal code.math.inline {
  padding: 0;
  background: transparent;
  font-size: 1em;
}

.reveal pre {
  box-sizing: border-box;
  width: 100%;
  margin: 0.45em 0 0.65em;
  padding: 23px 28px;
  border: 1px solid var(--tob-line);
  border-left: 6px solid var(--tob-accent);
  border-radius: 0;
  background: var(--tob-surface);
  box-shadow: none;
  color: var(--tob-ink);
  font-family: "Geist Mono", ui-monospace, monospace;
  font-size: 25px;
  line-height: 1.32;
}

.reveal pre code { background: transparent; }

.reveal .fragment {
  transition:
    opacity 420ms ease,
    transform 420ms cubic-bezier(0.22, 1, 0.36, 1),
    color 260ms ease,
    background-color 260ms ease;
}

.reveal .fragment:not(.visible) { transform: translateY(15px); }
.reveal .fragment.fade-out:not(.visible) { transform: none; }

.reveal .progress {
  height: 4px;
  color: var(--tob-accent);
}

.reveal .slide-number {
  right: auto;
  bottom: 34px;
  left: var(--tob-slide-gutter);
  min-width: 2ch;
  padding: 0;
  background: transparent;
  color: var(--tob-ink-muted);
  font-family: "Geist Mono", monospace;
  font-size: 16px;
  text-align: left;
}

.reveal > .controls { color: var(--tob-accent); }

/* The CBC animation carries a custom in-canvas title because every animation
   frame shares one absolute coordinate system.  Make it typographically
   identical to an ordinary Tangerine heading. */
.reveal .cbc-animation-title {
  padding: 0;
  border: 0;
  color: var(--tob-ink);
  font-family: var(--r-heading-font);
  font-size: 61px;
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.reveal .cbc-construction-animation {
  width: 100%;
  margin-right: 0;
  margin-left: 0;
}

/* Dark opening: the geometry and restrained diagonal are inherited from the
   Tangerine title slide rather than the older centered section-break style. */
.reveal .slides section[data-state="title"] {
  padding: 131px 108px 73px;
  background:
    linear-gradient(115deg, transparent 0 62%, rgba(255, 75, 64, 0.13) 62% 62.35%, transparent 62.35%),
    var(--tob-dark);
  color: var(--tob-chalk);
}

.reveal .slides section[data-state="title"]::before {
  top: 78px;
  left: 108px;
  width: 78px;
  background: #ff4b40;
}

.reveal .slides section[data-state="title"]::after {
  display: block;
  right: 108px;
  bottom: 73px;
  width: 108px;
  height: 65px;
  filter: none;
  opacity: 0.95;
}

.reveal .slides section[data-state="title"] h2 {
  width: 1060px;
  margin: 0 0 28px;
  color: var(--tob-chalk);
  font-size: 90px;
  line-height: 0.98;
}

.reveal .slides section[data-state="title"] h3 {
  width: 1020px;
  margin: 0 0 42px;
  color: #cbced3;
  font-size: 35px;
  font-weight: 400;
}

.reveal .slides section[data-state="title"] p {
  width: 1020px;
  color: #b4b6bb;
  font-size: 25px;
}

/* Closing slide keeps Tangerine's dark sign-off but adapts to this talk's
   three-line closing composition. */
.reveal .slides section[data-state="close"] {
  padding: 109px 108px 73px;
  background: var(--tob-dark);
  color: var(--tob-chalk);
}

.reveal .slides section[data-state="close"]::before {
  top: 69px;
  left: 108px;
  width: 78px;
  background: #ff4b40;
}

.reveal .slides section[data-state="close"]::after {
  right: 190px;
  bottom: 73px;
  width: 108px;
  height: 65px;
  filter: none;
}

.reveal .slides section[data-state="close"] h2 {
  margin-bottom: 24px;
  color: var(--tob-chalk);
  font-size: 73px;
}

.reveal .slides section[data-state="close"] h3 {
  margin-bottom: 45px;
  color: #ff4b40;
  font-family: "FH Lecturis", serif;
  font-size: 45px;
  font-weight: 400;
}

.reveal .slides section[data-state="close"] > p {
  color: #cbced3;
  font-size: 25px;
}

.reveal:has(.slides section[data-state="title"].present) .slide-number,
.reveal:has(.slides section[data-state="close"].present) .slide-number {
  color: #9a9da3;
}

html.reveal-print .reveal .slides > .pdf-page {
  background: var(--tob-canvas) !important;
}

html.reveal-print .reveal .slides > .pdf-page:has(> section[data-state="title"]),
html.reveal-print .reveal .slides > .pdf-page:has(> section[data-state="close"]) {
  background: var(--tob-dark) !important;
}

@media screen and (max-width: 700px), screen and (max-height: 500px) {
  .reveal > .controls { display: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal .fragment { transition-duration: 1ms; }
}