/* * Shared chrome for every page on mathazel.com: reset, type, the header navbar, * the logo, page layout and the footer. * * The hero additionally loads hero.css, which holds the centred field hero, the * before/after scroll flow and the proof strip - things only it has. * * Breakpoints follow Tailwind's: sm 640, md 768, lg 1024, all min-width. * * Every colour is a token. There is one paper, one panel and one ink, and every * other colour is an opacity of one of them. That rule is what keeps six pages, * a canvas hero and a dark footer reading as one surface - a literal rgba dropped * into a rule is how that drifts. * * The token values here are not free choices. They are the measured palette of the * reference language, and every one of them also appears in src/client/index.css so * the marketing site and the app are one product. Shared values are written as the * identical hex string in both files, on purpose, so a diff of the two token blocks * is meaningful. Change one and you have to change the other. */ /* * One face, self-hosted, one file. * * This replaces a stylesheet fetched from db.onlinewebfonts.com on every page load * of a site that is otherwise entirely first-party - a third party who could change * the face, or stop serving it, under a research instrument that has to render * identically for every participant. * * The path is ABSOLUTE and points into public/, not into this folder. public/ is * Vite's publicDir and is copied verbatim into dist/client, so /fonts/... answers * for this site and for the React app from one URL and one cache entry. A relative * url() would work here and be unreachable from the app. * * Note that absolutise() in vite.config.ts rewrites href/src in HTML only and never * touches a url() in a stylesheet - so this string is shipped exactly as written and * nothing in the build will correct it. The in every is * what puts it under check-links.mjs, which is the only reason a typo here fails the * build instead of silently rendering the whole site in Arial. */ @font-face { font-family: "Archivo"; src: url("/fonts/archivo-var.woff2") format("woff2"); font-weight: 100 900; font-stretch: 62% 125%; font-style: normal; font-display: swap; } /* * Inter carries body copy, Archivo carries display. Two faces rather than one, * because Archivo's tight display fit is exactly wrong at 16px and Inter's even * texture is exactly wrong at 90px. */ @font-face { font-family: "Inter"; src: url("/fonts/inter-var.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; } :root { /* ------------------------------------------------------------ surfaces */ /* A deeper light: the ground sits off white so the page is not glarey, and the panel is one clear step down from it. */ --paper: #edeff3; --panel: #e2e6ec; --ink: #0a1124; /* ------------------------------------------------- ink, measured on paper #3d475e 8.07:1 body text #5a6377 5.23:1 secondary text #8b93a3 2.68:1 rules and icons. NEVER text. */ --ink-72: #3d475e; --ink-62: #5a6377; --ink-40: #8b93a3; --hairline: rgba(10, 17, 36, 0.14); /* ------------------------------------------------------------- the blue Two values, and the split is a contrast one rather than a taste one. --accent is the brand blue and is what the eye reads as the colour of the product, but on this ground it measures 2.60:1, so it can fill a shape or draw a line and it cannot carry a word. --accent-deep is 5.01:1 on paper and takes white at 5.77:1, so every piece of blue TEXT and every filled button uses that one. */ --accent: #339aef; --accent-deep: #1668b0; --accent-wash: #dce9f8; /* The pressed state of the filled button. */ --accent-press: #12578f; --on-accent: #ffffff; /* --------------------------------------------------------- light on dark */ --paper-60: rgba(237, 239, 243, 0.62); --paper-24: rgba(237, 239, 243, 0.24); --paper-06: rgba(237, 239, 243, 0.07); /* ------------------------------------------- the field's ramp, on paper The hero is a light section now, so the field draws pale-blue contours on the paper rather than a dark image. Mirrored as PALE/DEEP in field.js; a canvas cannot read a custom property, so the pair lives in two places on purpose and is commented at both ends. */ --field-from: #edeff3; --field-to: #b9d4f2; /* ---------------------------------------------------------------- type */ --face: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif; --face-display: "Archivo", var(--face); /* Display is set the way the reference sets it: weight 600, negative tracking, line-height below 1, sentence case. The tracking is what stops a 90px headline reading as gappy. */ --t-display: clamp(2.75rem, 7vw, 5.625rem); --t-h1: clamp(2.25rem, 5vw, 4rem); --t-h2: clamp(2rem, 4.4vw, 3.5rem); --t-h3: clamp(1.5rem, 3vw, 2rem); --t-h4: clamp(1.25rem, 2.2vw, 1.5rem); --t-lede: clamp(1.0625rem, 1rem + 0.4vw, 1.1875rem); --t-body: 1rem; --t-micro: 0.75rem; --w-display: 600; --lh-display: 0.9; --lh-head: 1.05; --lh-body: 1.62; --lh-micro: 1.35; --track-display: -0.04em; --track-micro: 0.09em; /* --------------------------------------------------------- shape, motion */ --r: 3px; --r-pill: 999px; --ease: cubic-bezier(0.165, 0.84, 0.44, 1); --dur: 0.5s; /* ---------------------------------------------------------------- layout */ --gutter: 22px; --section: clamp(5rem, 10vw, 9rem); --shell: 76rem; --measure: 46rem; } *, *::before, *::after { box-sizing: border-box; } body, h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; } ul[class], ol[class] { margin: 0; padding: 0; list-style: none; } html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; } @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } } html, body { font-family: var(--face); -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; color: var(--ink); } body { min-height: 100%; background-color: var(--paper); } a { color: inherit; } :where(a, button, input, [tabindex]):focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; } .icon { flex: none; } .visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; } /* ============================================================ the floating bar */ /* * Inset from every viewport edge rather than spanning the top. Over the hero it is * translucent and light; past the hero ui.js adds .is-scrolled and it flips to * ink-on-paper. The two states share a geometry so only colour animates. */ .bar { position: fixed; inset: var(--gutter) var(--gutter) auto; z-index: 40; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.75rem 1rem; border: 1px solid var(--hairline); border-radius: var(--r); background: rgba(237, 239, 243, 0.82); backdrop-filter: blur(14px) saturate(130%); -webkit-backdrop-filter: blur(14px) saturate(130%); color: var(--ink); transition: all var(--dur) var(--ease); } .logo { display: inline-flex; align-items: center; gap: 0.625rem; color: inherit; text-decoration: none; transition: opacity var(--dur) var(--ease); } .logo:hover { opacity: 0.7; } .logo__mark { flex: none; border-radius: var(--r); } .logo__word { font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; } .menu { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0; border: 0; background: none; color: inherit; font: inherit; font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; cursor: pointer; } /* * A real element, not a bullet glyph. Glyph metrics differ across the fallback face * while the webfont is swapping, and the dot would visibly jump. */ .menu__dot { width: 9px; height: 9px; flex: none; border-radius: var(--r-pill); background: currentColor; transition: transform var(--dur) var(--ease); } .menu[aria-expanded="true"] .menu__dot { transform: scale(1.7); } /* ------------------------------------------------------------- the nav panel */ .nav-panel { position: absolute; inset: calc(100% + 8px) 0 auto; padding: 1.5rem; border: 1px solid var(--hairline); border-radius: var(--r); background: var(--paper); color: var(--ink); opacity: 0; transform: translateY(-6px); /* * visibility on its own line, delayed, so a closed panel is genuinely * non-focusable rather than merely invisible. This is behaviour, not decoration. */ visibility: hidden; transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s linear var(--dur); } .nav-panel.is-open { opacity: 1; transform: none; visibility: visible; transition-delay: 0s; } .nav-panel__links { display: grid; gap: 0.25rem; } .nav-panel__link { padding: 0.6rem 0; border-bottom: 1px solid var(--hairline); font-size: 1.0625rem; font-weight: 500; line-height: var(--lh-head); text-decoration: none; color: var(--ink); transition: opacity var(--dur) var(--ease); } .nav-panel__link:hover { opacity: 0.6; } .nav-panel__link[aria-current="page"] { color: var(--ink-62); } .nav-panel__foot { margin-top: 1.5rem; font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } /* ================================================================== eyebrow */ /* A dot and a small uppercase label. The one label style on the site. */ .eyebrow { display: inline-flex; /* flex-start, not center: a label that wraps keeps its dot on the first line. */ align-items: flex-start; gap: 0.55rem; font-size: var(--t-micro); line-height: var(--lh-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } /* * The dot is a ::before with a background, not a bullet character. A glyph's * metrics differ across the fallback face while the webfont is swapping and the * dot would visibly jump; a coloured box cannot. */ .eyebrow::before { content: ""; margin-top: 0.32em; width: 7px; height: 7px; flex: none; border-radius: var(--r-pill); background: currentColor; } .eyebrow--light { color: var(--paper-60); } /* ================================================================= sections */ .section { padding: var(--section) var(--gutter); } .section--panel { background: var(--panel); } .section__inner { max-width: var(--shell); margin: 0 auto; } .section__title { max-width: 20ch; margin: 0 auto; text-align: center; font-family: var(--face-display); font-size: var(--t-h2); font-weight: var(--w-display); line-height: var(--lh-display); letter-spacing: var(--track-display); color: var(--ink); /* A centred three-word orphan under a 96px uppercase title is the single most visible failure mode of this layout. */ text-wrap: balance; } /* ------------------------------------------- the asymmetric editorial column */ /* * Deliberately not 1fr 1fr. The left column holds a three-word label and the right * holds a paragraph; equal columns would leave the left one nine tenths empty and * read as a mistake rather than as a margin. */ .cols { display: grid; gap: 2rem; max-width: var(--shell); margin: clamp(3rem, 6vw, 6rem) auto 0; } @media (min-width: 900px) { .cols { grid-template-columns: minmax(10rem, 0.42fr) minmax(0, 1fr); gap: clamp(3rem, 8vw, 9rem); } } .cols__head { max-width: 24ch; font-family: var(--face-display); font-size: var(--t-h3); font-weight: var(--w-display); line-height: var(--lh-head); letter-spacing: -0.025em; color: var(--ink); } .cols__body { margin-top: 1.25rem; max-width: 52ch; font-size: var(--t-body); line-height: var(--lh-body); color: var(--ink-72); } .cols__body > * + * { margin-top: 1.25rem; } .cols__body a { color: var(--accent-deep); font-weight: 500; } /* ==================================================================== figure */ .figure { margin: clamp(3rem, 6vw, 6rem) 0 0; } .figure img { display: block; width: 100%; height: auto; border-radius: var(--r); background: var(--paper); } .figure__cap { margin-top: 0.875rem; font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } .figure--pair { display: grid; gap: 1.5rem; } @media (min-width: 768px) { .figure--pair { grid-template-columns: 1fr 1fr; } } /* ===================================================================== stats */ /* * A hairline per cell rather than a 1px grid gap over a dark background. Five items * in a three-column grid leaves an empty sixth cell that fills with rule colour and * renders as a grey slab; a border-top stops where the list stops. */ .stats { display: grid; grid-template-columns: 1fr; gap: 0 clamp(2rem, 6vw, 6rem); margin: clamp(3rem, 6vw, 6rem) 0 0; } @media (min-width: 640px) { .stats { grid-template-columns: repeat(2, 1fr); } } .stat { padding: 1.75rem 0 2.5rem; border-top: 1px solid var(--hairline); } .stat__n { font-family: var(--face-display); font-size: clamp(3rem, 7vw, 5.5rem); /* The one place the site leaves weight 400. Still one typeface - this is Archivo's wght axis - and it is what makes a 7rem numeral read as light rather than as a slab. */ font-weight: var(--w-display); line-height: 0.9; letter-spacing: -0.035em; color: var(--ink); font-variant-numeric: tabular-nums lining-nums; } .stat__unit { font-size: 0.22em; font-weight: 400; line-height: 1; vertical-align: super; margin-left: 0.28em; letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } .stat__cap { margin-top: 1rem; font-size: var(--t-micro); line-height: var(--lh-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } /* =================================================================== diagram */ .diagram { position: relative; margin: clamp(3rem, 6vw, 6rem) 0 0; padding: clamp(1.5rem, 4vw, 4rem); border-radius: var(--r); background: var(--panel); color: var(--ink); } .diagram svg { display: block; width: 100%; height: auto; } .diagram__chip { position: absolute; right: clamp(1rem, 2vw, 2rem); bottom: clamp(1rem, 2vw, 2rem); padding: 0.5rem 0.75rem; border: 1px solid var(--hairline); border-radius: var(--r); background: var(--paper); font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } @media (max-width: 639px) { /* At 360px the chip would land on top of the diagram's lowest arrow. */ .diagram__chip { position: static; display: block; margin-top: 1rem; } } /* ======================================================================= cta */ /* * The filled blue button. --accent-deep rather than --accent, because white on * the brand blue is 3.00:1 and on this one it is 5.77:1 - the button is the one * place the blue has to carry a word. */ .cta { display: inline-flex; align-items: center; gap: 0.6rem; padding: 0.8rem 1.15rem; border: 1px solid var(--accent-deep); border-radius: var(--r); background: var(--accent-deep); font-size: 0.9375rem; font-weight: 600; letter-spacing: -0.005em; text-decoration: none; color: var(--on-accent); transition: all var(--dur) var(--ease); } .cta:hover { background: var(--accent-press); border-color: var(--accent-press); } .cta .icon { transition: transform var(--dur) var(--ease); } .cta:hover .icon { transform: translateX(3px); } /* The quiet variant, for a second action next to the blue one. */ .cta--ghost { background: transparent; border-color: var(--hairline); color: var(--ink); } .cta--ghost:hover { background: var(--panel); border-color: var(--ink-40); } /* ==================================================================== footer */ .foot { background: var(--ink); color: var(--paper); padding: var(--section) var(--gutter) var(--gutter); } .foot__top { display: grid; gap: 3rem; max-width: var(--shell); margin: 0 auto; } @media (min-width: 900px) { .foot__top { grid-template-columns: minmax(0, 1fr) auto; align-items: end; } } .foot__word { font-family: var(--face-display); font-size: clamp(3rem, 13vw, 10rem); font-weight: var(--w-display); /* Below 1.0 on purpose: a 176px wordmark should not carry 176px of leading it never uses. Archivo's caps do not descend, so nothing is clipped. */ line-height: 0.85; letter-spacing: -0.045em; color: var(--paper); } .foot__links { display: grid; gap: 0.6rem; justify-items: start; } @media (min-width: 900px) { .foot__links { justify-items: end; } } .foot__links a { font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; text-decoration: none; /* .60 on ink is 6.15:1. Never --paper-24 for text: that is 2.18:1 and it is a border token, which is the one mistake this palette invites. */ color: var(--paper-60); transition: color var(--dur) var(--ease); } .foot__links a:hover { color: var(--paper); } .foot__bar { display: flex; flex-wrap: wrap; gap: 0.75rem 2rem; justify-content: space-between; max-width: var(--shell); margin: clamp(3rem, 6vw, 6rem) auto 0; padding: 1rem 1.25rem; border-radius: var(--r); background: var(--paper-06); font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--paper-60); } .foot__bar a { color: inherit; } .foot__bar a:hover { color: var(--paper); } /* ============================================================== word reveal */ /* * Nothing is hidden until ui.js has split the words - the hiding rule is scoped to * .is-split, which only that code adds. With JS off the page renders plainly rather * than blank, and there is no flash of hidden text to un-hide. */ [data-reveal].is-split .word { display: inline-block; } [data-reveal].is-split .word__in { display: inline-block; opacity: 0; transition: opacity var(--dur) var(--ease); transition-delay: calc(var(--i) * 40ms); } [data-reveal].is-split.is-in .word__in { opacity: 1; } /* ============================================================= content pages */ /* * The five pages that are prose. They load this file and not hero.css, which is why * every component above lives here rather than there. */ .page { max-width: var(--measure); margin: 0 auto; padding: calc(var(--gutter) * 6) var(--gutter) var(--section); } .page--wide { max-width: var(--shell); } .page__title { margin-top: 1rem; font-family: var(--face-display); font-size: var(--t-h1); font-weight: var(--w-display); line-height: var(--lh-display); letter-spacing: var(--track-display); color: var(--ink); text-wrap: balance; } .page__lede { margin-top: 1.5rem; font-size: var(--t-lede); line-height: var(--lh-body); color: var(--ink-72); } .prose { margin-top: clamp(2.5rem, 5vw, 4rem); } .prose > * + * { margin-top: 1.25rem; } .prose h2 { margin-top: clamp(2.5rem, 5vw, 4rem); padding-top: 1.5rem; border-top: 1px solid var(--hairline); font-family: var(--face-display); font-size: var(--t-h3); font-weight: var(--w-display); line-height: var(--lh-head); letter-spacing: -0.025em; color: var(--ink); } .prose h3 { margin-top: 2rem; font-family: var(--face-display); font-size: var(--t-h4); font-weight: var(--w-display); line-height: var(--lh-head); letter-spacing: -0.02em; color: var(--ink); } .prose p, .prose li { font-size: var(--t-body); line-height: var(--lh-body); color: var(--ink-72); } .prose a { color: var(--accent-deep); font-weight: 500; } .prose ul { padding-left: 1.25rem; list-style: disc; } .prose ul li::marker { color: var(--ink-40); } /* A quiet block for an aside, a worked equation or a contact card. */ .panel { margin-top: 2rem; padding: clamp(1.25rem, 3vw, 2rem); border: 1px solid var(--hairline); border-radius: var(--r); background: var(--panel); } .eq { margin-top: 1.5rem; padding: 1rem 1.25rem; border-left: 1px solid var(--hairline); border-radius: var(--r); background: var(--panel); font-variant-numeric: tabular-nums; font-size: var(--t-body); color: var(--ink-72); } /* ==================================================== the before/after split */ /* * Both sides get identical geometry. The claim is that these are the same size of * problem, and unequal boxes would undercut it before a word is read. * * The material distinction is what survived the glass card: the routine side is * --panel, an opaque closed box printed flat on the paper, and the task side is the * paper itself, the side that lets the ground through. Before is closed; after is * not. */ .split { display: grid; grid-template-columns: 1fr; gap: 1px; margin-top: clamp(3rem, 6vw, 6rem); border: 1px solid var(--hairline); border-radius: var(--r); background: var(--hairline); overflow: hidden; } @media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; } } .split__side { padding: clamp(1.5rem, 3vw, 2.75rem); } .split__side--routine { background: var(--panel); } .split__side--task { background: var(--paper); } .split__label { font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } .split__text { margin-top: 1rem; font-size: var(--t-body); line-height: var(--lh-body); color: var(--ink); } /* ============================================================ reduced motion */ @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; /* * The clamp used to stop at duration, which does not neutralise a staggered * reveal - it completes each word instantly but still one after another, a 40ms * staccato, which is exactly the effect the preference exists to avoid. */ transition-delay: 0s !important; scroll-behavior: auto !important; } } /* A page that is one screen of content centres itself rather than sitting at the top of a tall empty column. */ .page--screen { display: flex; flex-direction: column; justify-content: center; min-height: 100svh; } .panel__title { font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-72); } .panel__body { margin-top: 1rem; font-size: var(--t-body); line-height: var(--lh-body); color: var(--ink); } .panel__body > * + * { margin-top: 1rem; } .panel__body a { color: var(--ink); } /* ======================================================= the visible section nav */ .bar__links { display: none; gap: 0.25rem; } .bar__link { padding: 0.45rem 0.7rem; border-radius: var(--r); font-size: 0.9375rem; font-weight: 500; text-decoration: none; color: var(--ink-72); transition: all var(--dur) var(--ease); } .bar__link:hover { background: var(--panel); color: var(--ink); } /* The current section reads as a held chip, the way the reference marks its page. */ .bar__link[aria-current="page"] { background: var(--panel); color: var(--ink); } .bar__act { display: none; align-items: center; gap: 0.875rem; } .bar__quiet { font-size: 0.9375rem; font-weight: 500; text-decoration: none; color: var(--ink-72); transition: color var(--dur) var(--ease); } .bar__quiet:hover { color: var(--ink); } .cta--sm { padding: 0.55rem 0.9rem; font-size: 0.875rem; gap: 0.45rem; } @media (min-width: 900px) { /* The links carry the site above this width, so the Menu button has no job. */ .bar__links, .bar__act { display: flex; } .menu { display: none; } } .section__lede { max-width: 44rem; margin: 1.25rem auto 0; text-align: center; font-size: var(--t-lede); line-height: var(--lh-body); color: var(--ink-62); } /* ================================================================== the live plot */ /* Lives here rather than in hero.css: the figure is on /exemplars/, and the content pages load only this file. */ .library__live { margin: 0; padding: clamp(1.25rem, 3vw, 1.75rem); border: 1px solid var(--hairline); border-radius: var(--r); background: var(--paper); } .library__head { display: flex; flex-wrap: wrap; gap: 0.5rem 1rem; justify-content: space-between; font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-62); } .library__title { color: var(--ink); } .plot { display: block; width: 100%; height: auto; margin-top: 1.25rem; } .plot__axis { stroke: var(--ink-40); stroke-width: 0.8; } .plot__peak { stroke: var(--ink-40); stroke-width: 0.6; stroke-dasharray: 2 3; } .plot__curve { stroke: var(--accent-deep); stroke-width: 1.6; fill: none; } .plot__dropline { stroke: var(--ink-62); stroke-width: 0.8; stroke-dasharray: 2 3; } .plot__marker { fill: var(--accent-deep); } .plot__caption, .slider__label { display: flex; justify-content: space-between; margin-top: 0.75rem; font-size: var(--t-micro); letter-spacing: var(--track-micro); text-transform: uppercase; color: var(--ink-62); font-variant-numeric: tabular-nums; } .plot__readout { color: var(--ink); } .slider { width: 100%; margin-top: 1rem; accent-color: var(--accent-deep); }