/*
* plinthhealth.com
*
* The mark is a plinth: a slab resting on two legs. That is the whole visual argument of this
* page — a heavy horizontal rule separates every band, the headline stands on a drawn plinth, and
* annotations sit out in a left margin the way they do on a measured drawing. Nothing here is
* decorative for its own sake; if a line is present it is separating two things.
*
* Colour is never the only carrier of meaning, every surface token has a dark counterpart, and the
* whole page is built to WCAG 2.2 AA because the product it is selling is.
*/
/* --- Typefaces ---------------------------------------------------------------------------------
*
* Served from this origin. See fonts/LICENCE.txt for why that is a decision rather than an
* optimisation. Each is the Latin subset; `font-display: swap` so text is readable before the
* files land.
*/
@font-face {
font-family: 'Archivo';
src: url('fonts/archivo-latin.woff2') format('woff2');
font-weight: 500 700;
font-style: normal;
font-display: swap;
}
@font-face {
font-family: 'Source Serif 4';
src: url('fonts/source-serif-4-latin.woff2') format('woff2');
font-weight: 400 600;
font-style: normal;
font-display: swap;
}
@font-face {
font-family: 'IBM Plex Mono';
src: url('fonts/ibm-plex-mono-500-latin.woff2') format('woff2');
font-weight: 500;
font-style: normal;
font-display: swap;
}
/* --- Tokens ------------------------------------------------------------------------------------
*
* Light is the bare :root block and dark redefines the same names below. A rule that sets a
* literal colour instead of a token is readable in one scheme and invisible in the other, which is
* the exact way this went wrong in the app twice.
*/
:root {
--ink: #0d1b26;
--ink-soft: #4a5c6b;
--ground: #eef1f4;
--paper: #ffffff;
--rule: #b9c5ce;
--rule-soft: #dde3e9;
--accent: #0b5d8f;
--accent-quiet: #e3eef6;
--button: #0b5d8f;
--button-ink: #ffffff;
--button-hover: #08496f;
--clay: #8a4c15;
--focus: #b45309;
--measure: 34rem;
--sheet: 72rem;
--gutter: clamp(1.25rem, 4vw, 3.5rem);
}
@media (prefers-color-scheme: dark) {
:root {
--ink: #e6edf3;
--ink-soft: #9aabb8;
--ground: #0c1419;
--paper: #131f27;
--rule: #2f414f;
--rule-soft: #1f2d37;
--accent: #6fb3dc;
--accent-quiet: #17303f;
--button: #1372ad;
--button-ink: #ffffff;
--button-hover: #1a86c8;
--clay: #dda06a;
--focus: #f0a04b;
}
}
/* --- Reset and base ---------------------------------------------------------------------------- */
*,
*::before,
*::after {
box-sizing: border-box;
}
html {
-webkit-text-size-adjust: 100%;
}
body {
margin: 0;
background: var(--ground);
color: var(--ink);
font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
font-size: 1.0625rem;
line-height: 1.65;
font-synthesis-weight: none;
}
h1,
h2,
h3 {
font-family: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
font-weight: 700;
line-height: 1.1;
letter-spacing: -0.02em;
text-wrap: balance;
margin: 0;
}
p {
margin: 0;
max-width: var(--measure);
}
a {
color: var(--accent);
text-underline-offset: 0.18em;
text-decoration-thickness: from-font;
}
a:hover {
text-decoration-thickness: 2px;
}
/* 3px against the adjacent colour, never a removed outline: the keyboard user is the only person
who can tell where they are on the page. */
:focus-visible {
outline: 3px solid var(--focus);
outline-offset: 2px;
border-radius: 2px;
}
img,
svg {
max-width: 100%;
}
.skip {
position: absolute;
left: -9999px;
top: 0;
background: var(--paper);
color: var(--ink);
padding: 0.75rem 1.25rem;
z-index: 10;
font-family: 'Archivo', sans-serif;
}
.skip:focus {
left: 0;
}
.visually-hidden {
position: absolute;
width: 1px;
height: 1px;
margin: -1px;
padding: 0;
overflow: hidden;
clip: rect(0 0 0 0);
white-space: nowrap;
border: 0;
}
/* --- The sheet ---------------------------------------------------------------------------------
*
* Every band is the same grid: a narrow annotation column on the left, content on the right. Below
* 60rem the annotation folds above the content rather than squeezing, because a 6ch column of
* letter-spaced mono is unreadable.
*/
.band {
border-top: 2px solid var(--rule);
padding: clamp(3rem, 7vw, 5.5rem) var(--gutter);
}
.band--paper {
background: var(--paper);
}
.band__inner {
max-width: var(--sheet);
margin: 0 auto;
display: grid;
gap: clamp(1.5rem, 4vw, 3rem);
grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 60rem) {
.band__inner {
grid-template-columns: 9rem minmax(0, 1fr);
}
}
.annotation {
font-family: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
font-weight: 500;
font-size: 0.75rem;
letter-spacing: 0.14em;
text-transform: uppercase;
color: var(--ink-soft);
margin: 0;
/* Sits on the cap-height of the heading beside it rather than its line box. */
padding-top: 0.35rem;
}
.band__body {
display: flex;
flex-direction: column;
gap: 1.5rem;
min-width: 0;
}
.band__body h2 {
font-size: clamp(1.6rem, 3.4vw, 2.35rem);
}
.lede {
font-size: 1.1875rem;
color: var(--ink-soft);
}
/* --- Header ------------------------------------------------------------------------------------ */
.masthead {
background: var(--paper);
padding: 1.25rem var(--gutter);
}
.masthead__inner {
max-width: var(--sheet);
margin: 0 auto;
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: space-between;
gap: 1rem 2rem;
}
.masthead__lockup {
display: inline-flex;
align-items: center;
/* The lockup is the site name; the link needs no further label. */
line-height: 0;
}
.masthead__lockup svg {
height: 1.75rem;
width: auto;
fill: var(--accent);
}
.masthead nav ul {
list-style: none;
display: flex;
flex-wrap: wrap;
gap: 0.5rem 1.75rem;
margin: 0;
padding: 0;
}
.masthead nav a {
font-family: 'Archivo', sans-serif;
font-size: 0.9375rem;
font-weight: 600;
color: var(--ink);
text-decoration: none;
/* 24×24 minimum target (WCAG 2.5.8) without visibly padding a text link out of shape. */
display: inline-flex;
align-items: center;
min-height: 24px;
}
.masthead nav a:hover,
.masthead nav a:focus-visible {
color: var(--accent);
text-decoration: underline;
text-underline-offset: 0.25em;
}
/* --- Hero -------------------------------------------------------------------------------------- */
.hero {
background: var(--paper);
border-top: 2px solid var(--rule);
padding: clamp(3rem, 8vw, 6rem) var(--gutter) clamp(3rem, 7vw, 5rem);
}
.hero__inner {
max-width: var(--sheet);
margin: 0 auto;
}
.hero h1 {
font-size: clamp(2.5rem, 8vw, 5.25rem);
letter-spacing: -0.035em;
max-width: 16ch;
}
/*
* The mark at page scale: a slab on two legs, with the headline standing on it. Drawn rather than
* an ![]()
so it takes the accent token in both schemes, and aria-hidden because it says nothing a
* screen-reader user needs — the words above it are the content.
*/
.plinth {
margin: clamp(1.75rem, 4vw, 2.75rem) 0 clamp(2rem, 4vw, 3rem);
position: relative;
height: 3.25rem;
max-width: 44rem;
}
.plinth__slab {
position: absolute;
inset: 0 0 auto 0;
height: 0.625rem;
background: var(--accent);
}
.plinth__leg {
position: absolute;
top: 0.625rem;
width: 0.625rem;
height: 2.625rem;
background: var(--accent);
}
.plinth__leg:first-of-type {
left: 8%;
}
.plinth__leg:last-of-type {
right: 8%;
}
.hero__lede {
font-size: clamp(1.125rem, 2.2vw, 1.375rem);
max-width: 42rem;
color: var(--ink-soft);
}
.hero__actions {
margin-top: 2.25rem;
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 1.25rem 2rem;
}
/* The symbol definitions. Out of flow and zero-sized: