solid-memo.css

/* SPDX-FileCopyrightText: 2026 Anton Wiklund and Solid Memo contributors
 *
 * SPDX-License-Identifier: MIT
 */

/*
 * @theme solid-memo
 * @auto-scaling true
 * @size 16:9 1280px 720px
 *
 * Solid Memo's look, from the app's Standard light palette
 * (https://github.com/solid-memo/website/blob/main/packages/ui/src/palettes.css)
 * and its fonts: Fredoka for text, Bangers for headings, tilted, with a
 * yellow shadow. Every text pair meets WCAG AA, most AAA: text on the page
 * 15.2:1, muted text 6.2:1, green text 5.9:1, the page's text on navy
 * 15.2:1, muted text and list numbers on navy 10.3:1. The yellow, red and blue are never text.
 *
 * The fonts are embedded when the talks are built (scripts/build.mjs):
 * each url("@fontsource…") below becomes the font file itself, so a talk
 * loads nothing from anywhere else.
 *
 * Classes, set on a slide with <!-- _class: name -->:
 *   lead     the title slide: centered, larger
 *   divider  a part's first slide: navy, with the promises
 *   phone    text on the left, a phone's screenshot on the right
 *   big      one figure, as large as it goes
 *   quiet    smaller text, for a slide with more to say
 */

@font-face {
  font-family: 'Fredoka Variable';
  font-style: normal;
  font-weight: 300 700;
  font-display: block;
  src: url('@fontsource-variable/fredoka/files/fredoka-latin-wght-normal.woff2') format('woff2-variations');
}

@font-face {
  font-family: Bangers;
  font-style: normal;
  font-weight: 400;
  font-display: block;
  src: url('@fontsource/bangers/files/bangers-latin-400-normal.woff2') format('woff2');
}

:root {
  --bg: #f7f6f1;
  --surface: #ffffff;
  --text: #16202a;
  --text-muted: #545c68;
  --border: #e4e1d5;
  --primary: #2c6b3d;
  --link: #25603a;
  --navy: #16202a;
  --on-navy: #f7f6f1;
  --on-navy-muted: #c9cdd1;
  --accent-blue: #b1cfe3;
  --accent-yellow: #e8ab14;
  --accent-red: #e8432b;
  --font-body:
    'Fredoka Variable', ui-rounded, 'Arial Rounded MT Bold', system-ui, -apple-system, 'Segoe UI', Roboto,
    sans-serif;
  --font-display: Bangers, 'Fredoka Variable', ui-rounded, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', 'Cascadia Mono', Menlo, Consolas, 'Liberation Mono', monospace;
}

section {
  width: 1280px;
  height: 720px;
  box-sizing: border-box;
  padding: 56px 80px 72px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 32px;
  font-weight: 400;
  line-height: 1.45;
  position: relative;
}

/* The app's four colors, along the bottom, as on its social preview. */
section::before {
  content: '';
  position: absolute;
  inset: auto 0 0 0;
  height: 10px;
  background: linear-gradient(
    to right,
    var(--accent-red) 0 25%,
    var(--accent-yellow) 25% 50%,
    var(--accent-blue) 50% 75%,
    var(--primary) 75% 100%
  );
}

h1,
h2,
h3 {
  margin: 0 0 0.45em;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.1;
  color: var(--text);
  text-shadow: 0.06em 0.06em 0 var(--accent-yellow);
  align-self: flex-start;
}

h1 {
  font-size: 2.6em;
  transform: rotate(-2deg);
  transform-origin: left center;
}

h2 {
  font-size: 1.75em;
  transform: rotate(-1.5deg);
  transform-origin: left center;
}

h3 {
  font-size: 1.15em;
  text-shadow: none;
  font-family: var(--font-body);
  font-weight: 600;
  letter-spacing: 0;
}

p,
ul,
ol,
table,
pre,
blockquote {
  margin: 0 0 0.6em;
}

ul,
ol {
  padding-left: 1.2em;
}

li + li {
  margin-top: 0.2em;
}

li::marker {
  color: var(--primary);
}

strong {
  font-weight: 650;
  color: var(--primary);
}

em {
  font-style: normal;
  font-weight: 550;
  background: linear-gradient(transparent 62%, rgb(232 171 20 / 45%) 62%);
}

a {
  color: var(--link);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.12em;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.05em 0.3em;
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.7em 0.9em;
  font-size: 0.68em;
  line-height: 1.45;
  overflow: hidden;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: 1em;
}

/* Code in a language Marp's highlight.js knows, in the palette's colors.
 * Turtle has no grammar there, and shows in the text's color. */
.hljs-comment,
.hljs-meta {
  color: var(--text-muted);
}

.hljs-string {
  color: var(--primary);
}

.hljs-keyword,
.hljs-built_in,
.hljs-type {
  color: #8a2a17;
}

.hljs-number,
.hljs-literal,
.hljs-symbol {
  color: #1d4f73;
}

table {
  border-collapse: collapse;
  font-size: 0.8em;
}

th,
td {
  text-align: left;
  padding: 0.3em 0.8em;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  font-weight: 600;
  border-bottom: 2px solid var(--text);
}

blockquote {
  border-left: 6px solid var(--accent-yellow);
  padding-left: 0.8em;
  color: var(--text);
}

img {
  background: transparent;
}

header,
footer {
  position: absolute;
  left: 80px;
  right: 80px;
  font-size: 18px;
  color: var(--text-muted);
}

header {
  top: 24px;
}

footer {
  bottom: 26px;
}

/* The slide's number, bottom right. */
section::after {
  padding: 0;
  line-height: 1;
  position: absolute;
  right: 80px;
  bottom: 26px;
  font-size: 18px;
  color: var(--text-muted);
}

/* Two or three columns, from <div class="cols">, each a <div>. */
.cols {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 48px;
  align-items: start;
}

.cols > div > :first-child {
  margin-top: 0;
}

.muted {
  color: var(--text-muted);
}

/* The title slide. */
section.lead {
  align-items: center;
  text-align: center;
}

section.lead h1 {
  align-self: center;
  transform-origin: center;
  font-size: 2.9em;
}

section.lead p {
  font-size: 1.05em;
}

/* A part's first slide: navy, as the app's masthead. */
section.divider {
  background: var(--navy);
  color: var(--on-navy);
}

section.divider h1,
section.divider h2 {
  color: var(--on-navy);
}

section.divider strong {
  color: var(--on-navy);
  background: linear-gradient(transparent 62%, rgb(44 107 61 / 90%) 62%);
}

section.divider p,
section.divider li,
section.divider footer,
section.divider::after {
  color: var(--on-navy-muted);
}

section.divider li::marker {
  color: var(--on-navy-muted);
}

section.divider a {
  color: var(--on-navy);
}

/* A few words that carry the talk, larger. */
section.statement p {
  font-size: 1.35em;
  line-height: 1.6;
}

/* Text on the left, a phone's screenshot (390 × 844, at 2×) on the right. */
section.phone {
  display: grid;
  grid-template-columns: 1fr 248px;
  grid-auto-rows: min-content;
  column-gap: 64px;
  align-content: center;
}

section.phone > :not(header, footer) {
  grid-column: 1;
}

section.phone > p:has(> img) {
  grid-column: 2;
  grid-row: 1 / span 20;
  align-self: center;
  margin: 0;
}

section.phone > p:has(> img) img {
  display: block;
  width: 236px;
  height: auto;
  border-radius: 26px;
  border: 6px solid var(--navy);
  box-shadow: 10px 10px 0 var(--accent-blue);
}

/* Two phones side by side. */
section.phone.two {
  grid-template-columns: 1fr 212px 212px;
  column-gap: 40px;
}

section.phone.two > p:has(> img) {
  grid-column: 2 / span 2;
  display: flex;
  gap: 40px;
}

section.phone.two > p:has(> img) img {
  width: 212px;
}

/* The call to act: what to do, beside the codes to scan. */
.cols.join {
  grid-template-columns: 1.5fr 1fr 1fr;
  grid-auto-flow: row;
  align-items: center;
}

.cols.join img {
  display: block;
  width: 220px;
  height: auto;
  margin-bottom: 0.4em;
}

.cols.join .muted {
  font-size: 0.7em;
}

/* One figure, as large as it goes. */
section.big {
  align-items: center;
  text-align: center;
}

section.big h2 {
  align-self: center;
  transform-origin: center;
}

section.big .figure {
  font-family: var(--font-display);
  font-size: 4.4em;
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--text);
  text-shadow: 0.05em 0.05em 0 var(--accent-yellow);
  margin: 0.1em 0 0.25em;
}

section.quiet {
  font-size: 27px;
}

/* A picture that fills the slide's width, such as a drawing. */
section .wide img {
  display: block;
  width: 100%;
  height: auto;
}