/* ========================================================================== richardhu.org — single stylesheet for the whole site. Palette is deliberately limited to four values (see --paper, --ink, --polemonium, --range-of-light). The two chromatic accents are used sparingly: the wordmark, nav tabs, and a few small marks. Greys are always the ink colour at reduced alpha, never a new hue. ========================================================================== */ @font-face { font-family: "Berkeley Oldstyle"; src: url("/assets/fonts/BerkeleyStd-Black.otf") format("opentype"); font-weight: 900; font-style: normal; font-display: swap; } :root { --paper: #ffffff; --ink: #000000; --polemonium: #7a7eb9; --range-of-light: #ff9f6a; --cal-gold: #FDB515; --shadow: #91170A; /* Ink at reduced strength. Keeps the palette to four colours. */ --ink-70: rgba(0, 0, 0, 0.7); --ink-55: rgba(0, 0, 0, 0.55); --ink-40: rgba(0, 0, 0, 0.4); --ink-12: rgba(0, 0, 0, 0.12); --ink-06: rgba(0, 0, 0, 0.06); --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; --font-display: "Berkeley Oldstyle", serif; --measure: 44rem; --measure-wide: 62rem; --measure-gallery: 78rem; --gutter: 1.5rem; } /* Dark palette. Toggled by data-theme="dark" on . */ [data-theme="dark"] { --paper: #161616; --ink: #e8e8e8; --polemonium: #9da1d4; --range-of-light: #ff9f6a; --ink-70: rgba(232, 232, 232, 0.7); --ink-55: rgba(232, 232, 232, 0.55); --ink-40: rgba(232, 232, 232, 0.4); --ink-12: rgba(232, 232, 232, 0.12); --ink-06: rgba(232, 232, 232, 0.06); color-scheme: dark; } *, *::before, *::after { box-sizing: border-box; } html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; } body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-sans); font-size: 17px; line-height: 1.65; letter-spacing: -0.003em; overflow-wrap: break-word; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; } /* --------------------------------------------------------------- skip link */ .skip-link { position: absolute; left: -9999px; top: 0; padding: 0.6rem 1rem; background: var(--ink); color: var(--paper); z-index: 100; } .skip-link:focus { left: 0; } /* -------------------------------------------------------------------- header */ .site-header { position: sticky; top: 0; z-index: 50; background: var(--paper); border-bottom: 1px solid var(--ink-12); } .site-header__inner { max-width: var(--measure-wide); margin: 0 auto; padding: 0 var(--gutter); height: 4rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; } .wordmark { font-family: var(--font-display); font-size: 1.1rem; font-weight: 900; letter-spacing: 0.01em; text-decoration: none; color: var(--cal-gold); text-shadow: -0.11em 0.05em 0 var(--shadow); white-space: nowrap; } .wordmark::after, .wordmark:hover::after { display: none; } .wordmark__accent { background: none; color: inherit; padding: 0; margin-left: 0; border-radius: 0; } .nav { display: flex; align-items: center; gap: 1.75rem; } .nav a { position: relative; font-size: 0.8rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-55); text-decoration: none; padding: 0.35rem 0; } .nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -0.15rem; height: 2px; background: var(--range-of-light); transform: scaleX(0); transform-origin: left; transition: transform 250ms ease; } .nav a:hover { color: var(--ink); text-decoration: none; } .nav a:hover::after { transform: scaleX(1); } .nav a[aria-current="page"] { color: var(--ink); } .nav a[aria-current="page"]::after { transform: scaleX(1); } .nav:hover a[aria-current="page"]::after { transform: scaleX(0); } .nav a[aria-current="page"]:hover::after { transform: scaleX(1); } /* Dark-mode toggle lives at the right edge of the header bar. */ .theme-toggle { width: 2rem; height: 2rem; display: grid; place-items: center; border: 1px solid var(--ink-12); border-radius: 50%; background: transparent; color: var(--ink-55); font-size: 0.85rem; line-height: 1; cursor: pointer; flex: 0 0 auto; transition: border-color 150ms ease, color 150ms ease; padding: 0; } .theme-toggle:hover { border-color: var(--ink-40); color: var(--ink); } .theme-toggle .icon-moon, [data-theme="dark"] .theme-toggle .icon-sun { display: none; } [data-theme="dark"] .theme-toggle .icon-moon { display: block; } /* The wordmark plus three tabs must fit a 320px-wide phone without forcing the page to scroll sideways, so both shrink together. */ @media (max-width: 30rem) { :root { --gutter: 1.15rem; } .site-header__inner { height: 3.5rem; gap: 0.75rem; } .wordmark { font-size: 0.95rem; } .nav { gap: 0.9rem; } .nav a { font-size: 0.7rem; letter-spacing: 0.05em; } } @media (max-width: 22rem) { .wordmark { display: none; } .nav { width: 100%; justify-content: space-between; } } /* --------------------------------------------------------------------- main */ .wrap { max-width: var(--measure); margin: 0 auto; padding: 4rem var(--gutter) 6rem; } /* The photography grid gets more room than a column of text needs. */ .wrap--gallery { max-width: var(--measure-gallery); } /* Standfirst paragraph under a page's

. */ .page-intro { margin: 0.9rem 0 0; max-width: 42rem; font-size: 1.02rem; color: var(--ink-70); text-wrap: pretty; } /* --------------------------------------------------------------- typography */ h1, h2, h3, h4 { letter-spacing: -0.02em; line-height: 1.2; margin: 0; font-weight: 650; } h1 { font-size: clamp(1.9rem, 5vw, 2.5rem); } /* Section label: small, uppercase, preceded by a hairline rule. */ .section { margin-top: 4rem; } .section > h2 { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.14em; padding-top: 1.1rem; border-top: 1px solid var(--ink-12); margin-bottom: 1.75rem; } h3 { font-size: 1.15rem; margin-top: 2.75rem; margin-bottom: 0.85rem; } p { margin: 0 0 1.15rem; } a { position: relative; color: inherit; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.18em; text-decoration-color: var(--ink-40); transition: text-decoration-color 250ms ease; } a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 1px; background: var(--range-of-light); transform: scaleX(0); transform-origin: left; transition: transform 250ms ease; } a:hover { text-decoration-color: transparent; } a:hover::after { transform: scaleX(1); } strong { font-weight: 650; } em { font-style: italic; } hr { border: 0; border-top: 1px solid var(--ink-12); margin: 3rem 0; } ::selection { background: var(--polemonium); color: var(--paper); } :focus-visible { outline: 2px solid var(--polemonium); outline-offset: 3px; } /* ---------------------------------------------------------------- home hero */ .hero { display: flex; align-items: flex-start; gap: 2rem; } .hero__portrait { flex: 0 0 auto; width: 132px; height: 132px; object-fit: cover; border-radius: 2px; background: var(--ink-06); } .hero__body { min-width: 0; } .hero__body h1 { font-family: var(--font-display); font-weight: 900; color: var(--cal-gold); text-shadow: -0.1em 0.05em 0 var(--shadow); } .hero__role { margin: 0.7rem 0 0; font-size: 1.02rem; color: var(--ink-70); text-wrap: pretty; } /* Inline list of external profiles. */ .linkrow { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin: 1.25rem 0 0; padding: 0; list-style: none; } .linkrow a { position: relative; font-size: 0.78rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em; text-decoration: none; padding-bottom: 0.15rem; } .linkrow a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--range-of-light); transform: scaleX(0); transform-origin: left; transition: transform 250ms ease; } .linkrow a:hover { color: var(--ink); } .linkrow a:hover::after { transform: scaleX(1); } @media (max-width: 34rem) { .hero { flex-direction: column; gap: 1.5rem; } .hero__portrait { width: 108px; height: 108px; } } /* ------------------------------------------------------------------ about me */ /* One job or degree. Title left, place/date right, collapsing on mobile. */ .entry { margin-bottom: 2.5rem; } .entry:last-child { margin-bottom: 0; } .entry__head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin-bottom: 0.15rem; } .entry__org { font-size: 1.05rem; font-weight: 650; letter-spacing: -0.015em; } .entry__org a::after { bottom: 0; } .entry__meta { flex: 0 0 auto; font-size: 0.82rem; color: var(--ink-55); white-space: nowrap; } .entry__title { font-size: 0.95rem; font-style: italic; color: var(--ink-70); margin-bottom: 0.7rem; } .entry__head .entry__title { margin-bottom: 0; } .entry p { margin-bottom: 0.7rem; } /* Technology list, e.g. Python • C++ • Linux */ .stack { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--ink-55); text-transform: uppercase; } .stack span { color: var(--polemonium); padding: 0 0.15rem; } @media (max-width: 34rem) { .entry__head { flex-direction: column; gap: 0.1rem; } .entry__meta { white-space: normal; } } /* Bulleted content lists. */ .list { margin: 0 0 1.15rem; padding-left: 1.1rem; } .list li { margin-bottom: 0.5rem; } .list li::marker { color: var(--ink-40); } .list--tight li { margin-bottom: 0.3rem; } .list ul { margin: 0.4rem 0 0; padding-left: 1.1rem; } /* Adventure log: a definition-style list of trips. */ .trips { margin: 0; padding-left: 1.1rem; } .trips > li { margin-bottom: 1rem; } .trips > li::marker { color: var(--ink-40); } .trips .trips__party { margin-left: 0.5em; font-size: 0.85rem; color: var(--ink-55); } .trips .trips__where { display: block; font-size: 0.85rem; color: var(--ink-55); } /* ------------------------------------------------------------- photography */ /* Three photographs per row, dropping to two and then one as space runs out. Every frame is a fixed 4:3 window and the image is cropped to fill it, so the grid stays even no matter what is dropped into content/photos.yaml. */ .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.9rem; margin-top: 2.75rem; } .tile { position: relative; display: block; overflow: hidden; aspect-ratio: 4 / 3; background: var(--ink-06); text-decoration: none; cursor: zoom-in; } .tile::after { display: none; } .tile img { display: block; width: 100%; height: 100%; object-fit: cover; } /* Hovering fades in a black scrim and the caption together, which reads as the photograph gradually darkening. Leaving reverses it over the same duration. */ .tile__overlay { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.3rem; padding: 1.25rem; text-align: center; background: rgba(0, 0, 0, 0.55); color: #ffffff; opacity: 0; transition: opacity 420ms ease; } .tile:hover .tile__overlay, .tile:focus-visible .tile__overlay { opacity: 1; } .tile__title { font-size: 0.98rem; font-weight: 600; letter-spacing: -0.01em; line-height: 1.3; } .tile__place { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.11em; color: rgba(255, 255, 255, 0.75); } /* Caption notes are shown in the hover overlay, styled for the dark scrim. */ .grid .tile__note { margin-top: 0.5rem; font-size: 0.76rem; line-height: 1.5; color: rgba(255, 255, 255, 0.82); max-width: 22rem; text-transform: none; letter-spacing: normal; } .grid .tile__note cite { display: block; margin-top: 0.25rem; font-size: 0.68rem; font-style: normal; color: rgba(255, 255, 255, 0.6); } @media (max-width: 62rem) { .grid { grid-template-columns: repeat(2, 1fr); } } @media (max-width: 30rem) { .grid { grid-template-columns: 1fr; gap: 0.7rem; } } /* Touch screens have no hover, so show the caption over a bottom gradient instead of hiding it behind an interaction that cannot happen. */ @media (hover: none) { .tile__overlay { opacity: 1; align-items: flex-start; justify-content: flex-end; text-align: left; padding: 1rem; background: linear-gradient( to top, rgba(0, 0, 0, 0.75) 0%, rgba(0, 0, 0, 0.35) 45%, rgba(0, 0, 0, 0) 100% ); } } /* ------------------------------------------------------------------ lightbox */ .lightbox { position: fixed; inset: 0; z-index: 200; display: none; background: var(--paper); } .lightbox.is-open { display: grid; grid-template-rows: 1fr auto; height: 100dvh; } .lightbox__stage { display: flex; align-items: center; justify-content: center; min-height: 0; overflow: hidden; padding: 4rem 1.5rem 0; box-sizing: border-box; } .lightbox__img { display: block; width: auto; height: auto; max-width: 100%; max-height: 100%; object-fit: contain; } .lightbox__bar { display: flex; align-items: flex-end; justify-content: space-between; gap: 1.5rem; padding: 1rem 1.25rem 1.25rem; font-size: 0.85rem; color: var(--ink-55); } .lightbox__caption { margin: 0; max-width: 46rem; } /* The caption markup is reused from the grid, where it sits on a dark scrim. */ .lightbox__caption .tile__title { display: block; color: var(--ink); font-weight: 500; } .lightbox__caption .tile__place { display: block; color: var(--ink-55); } .lightbox__caption .tile__note { display: block; margin-top: 0.7rem; padding-left: 0.9rem; border-left: 2px solid var(--range-of-light); font-size: 0.9rem; color: var(--ink-70); text-transform: none; letter-spacing: normal; } .lightbox__caption .tile__note cite { display: block; margin-top: 0.35rem; font-size: 0.82rem; font-style: normal; color: var(--ink-55); } .lightbox__controls { display: flex; gap: 0.4rem; flex: 0 0 auto; } .iconbtn { width: 2.4rem; height: 2.4rem; display: grid; place-items: center; border: 1px solid var(--ink-12); border-radius: 2px; background: var(--paper); color: var(--ink); font-size: 1rem; line-height: 1; cursor: pointer; font-family: var(--font-sans); } .iconbtn:hover { border-color: var(--ink); } .lightbox__close { position: absolute; top: 1rem; right: 1.25rem; } /* --------------------------------------------------------------------- blog */ .postlist { margin-top: 3rem; list-style: none; padding: 0; } .postlist li { padding-top: 2rem; margin-top: 2rem; border-top: 1px solid var(--ink-12); } .postlist li:first-child { border-top: 0; margin-top: 0; padding-top: 0; } .postlist h2 { font-size: 1.3rem; margin-bottom: 0.4rem; } .postlist h2 a { text-decoration: none; } .postlist h2 a::after { bottom: 0; } .postlist h2 a:hover::after { transform: scaleX(1); } .dateline { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-55); } .tags { margin: 0.9rem 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem; } .tags li { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.03em; color: var(--ink-55); border: 1px solid var(--ink-12); border-radius: 2px; padding: 0.1rem 0.45rem; margin: 0; } /* -------------------------------------------------------------- post bodies */ /* Holds only the date and the title; the standfirst paragraphs follow it. */ .post header { margin-bottom: 0.6rem; } .post h1 { font-size: clamp(1.7rem, 4.4vw, 2.2rem); margin-bottom: 0.7rem; text-wrap: balance; } .post h3 { padding-top: 2.5rem; margin-top: 3rem; border-top: 1px solid var(--ink-12); font-size: 1.25rem; } .post h3 .anchor { float: right; font-size: 0.9rem; font-weight: 400; text-decoration: none; color: var(--ink-40); } .post h3 .anchor::after { display: none; } .post h3 .anchor:hover { color: var(--range-of-light); } .post img { display: block; max-width: 100%; height: auto; margin: 2rem auto; } .post figure { margin: 2rem 0; } .post figure img { margin-bottom: 0.75rem; } .post figcaption { font-size: 0.85rem; color: var(--ink-55); text-align: center; } /* Diagrams are capped narrower than the text column, but must still shrink on a phone rather than pushing the page sideways. */ .post .diagram { width: 100%; max-width: 24rem; } /* Table of contents at the top of a post. */ .toc { border: 1px solid var(--ink-12); border-radius: 2px; padding: 1.25rem 1.5rem; margin: 2.5rem 0; } .toc h2 { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.14em; margin-bottom: 0.75rem; } .toc ol { margin: 0; padding-left: 1.2rem; font-size: 0.95rem; } .toc li { margin-bottom: 0.25rem; } .toc li::marker { color: var(--ink-40); font-variant-numeric: tabular-nums; } /* Boxed algorithm / theorem statement. */ .callout { border-left: 2px solid var(--polemonium); padding: 0.25rem 0 0.25rem 1.35rem; margin: 2rem 0; } .callout__label { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 0.6rem; } .callout p { margin-bottom: 0.7rem; } .callout p:last-child { margin-bottom: 0; } .callout ol { margin: 0; padding-left: 1.3rem; } .callout ol li { margin-bottom: 0.6rem; } .callout ol li:last-child { margin-bottom: 0; } /* ------------------------------------------------------------------- code */ code { font-family: var(--font-mono); font-size: 0.86em; background: var(--ink-06); padding: 0.08em 0.2em; border-radius: 2px; } pre { margin: 1.75rem 0; padding: 1.1rem 1.25rem; overflow-x: auto; background: var(--paper); border: 1px solid var(--ink-12); border-left: 2px solid var(--ink); border-radius: 2px; line-height: 1.55; tab-size: 4; } pre code { background: none; padding: 0; font-size: 0.82rem; white-space: pre; } /* ------------------------------------------------------------------- math */ /* Vendored KaTeX handles the glyphs; this only manages overflow so long display equations scroll instead of breaking the layout on phones. */ .katex-display { overflow-x: auto; overflow-y: hidden; padding: 0.5rem 0; } /* ------------------------------------------------------------------ footer */ .site-footer { border-top: 1px solid var(--ink-12); margin-top: 2rem; } .site-footer__inner { max-width: var(--measure-wide); margin: 0 auto; padding: 2rem var(--gutter) 3rem; display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; justify-content: space-between; font-size: 0.78rem; color: var(--ink-55); } .site-footer a::after { bottom: 0; } .backtotop { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; } /* ------------------------------------------------------------------ 404 */ .notfound { text-align: center; padding: 7rem var(--gutter); } .notfound__code { font-family: var(--font-mono); font-size: 0.8rem; letter-spacing: 0.2em; color: var(--range-of-light); margin-bottom: 1rem; } /* -------------------------------------------------------------- print (CV) */ @media print { .site-header, .site-footer, .lightbox, .skip-link, .linkrow { display: none !important; } body { font-size: 10.5pt; } .wrap { max-width: none; padding: 0; } a::after { display: none !important; } .section { break-inside: avoid; } .entry { break-inside: avoid; } } @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }