/* mariaprokofieva.org: one stylesheet, no framework. */

:root {
  --paper: #f3f5f8;
  --paper-2: #e6eaf0;
  --ink: #141a24;
  --ink-2: #4a5566;
  --rule: #cdd5e0;
  --accent: #1d3d9f;
  --accent-ink: #f3f5f8;
  --focus: #2563eb;

  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --gutter: clamp(1rem, 4vw, 2.5rem);
  --max: 72rem;
  --measure: 40rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f141c;
    --paper-2: #171e29;
    --ink: #e6eaf0;
    --ink-2: #a3adbb;
    --rule: #2a3340;
    --accent: #9db8ff;
    --accent-ink: #0f141c;
    --focus: #c3d3ff;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

img { max-width: 100%; height: auto; }

a { color: inherit; text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent); text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.15; letter-spacing: -0.01em; margin: 0; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }

.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.5rem 0.75rem; z-index: 10; }
.skip:focus { left: 0.5rem; top: 0.5rem; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Masthead */
.masthead { border-bottom: 1px solid var(--rule); }
.masthead__inner { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.25rem 1.5rem; padding-block: 1.1rem; }
.wordmark { font-family: var(--serif); font-size: 1.3rem; font-weight: 500; text-decoration: none; letter-spacing: -0.01em; }
.nav { display: flex; gap: 1.4rem; }
.nav a { text-decoration: none; font-size: 0.95rem; color: var(--ink-2); padding-block: 0.25rem; }
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--accent); }

main { display: block; }

/* Shared */
.eyebrow { font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); display: flex; flex-wrap: wrap; gap: 0.25rem 0.9rem; }
.eyebrow__name { color: var(--ink); font-weight: 600; }
.section-head { max-width: var(--measure); margin-bottom: 2rem; }
.section-head h2 { font-size: clamp(1.6rem, 3.2vw, 2.1rem); }
.section-head p { color: var(--ink-2); margin-top: 0.5rem; }
.section-head--row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 0.5rem 1rem; max-width: none; }
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink); text-decoration: none; padding: 0.7rem 1.15rem; border-radius: 2px; font-weight: 500; font-size: 0.95rem; }
.btn:hover { color: var(--accent-ink); filter: brightness(1.08); }
.textlink { font-weight: 500; font-size: 0.95rem; }
.textlink::after { content: " →"; }
.pill { display: inline-block; font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; border: 1px solid var(--accent); color: var(--accent); padding: 0.05rem 0.45rem; border-radius: 999px; margin-right: 0.35rem; vertical-align: 0.1em; }

/* Hero */
.hero { padding-block: clamp(3rem, 9vw, 6.5rem) clamp(3rem, 7vw, 5rem); }
.tagline { font-size: clamp(2.5rem, 8vw, 5.4rem); font-weight: 400; line-height: 1.02; letter-spacing: -0.025em; margin-top: 1.4rem; max-width: 13ch; }
.spine { font-family: var(--serif); font-size: clamp(1.2rem, 2.3vw, 1.5rem); line-height: 1.45; max-width: 36rem; margin-top: 1.75rem; color: var(--ink); }
.hero__links { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem; margin-top: 2.25rem; }

/* Domain ledger */
.domain { padding-block: clamp(2.5rem, 6vw, 4.5rem); border-top: 1px solid var(--rule); }
.ledger { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.ledger__cell { padding: 1.75rem 1.75rem 2rem 0; border-bottom: 1px solid var(--rule); }
.ledger__cell:nth-child(2n) { padding-left: 1.75rem; padding-right: 0; border-left: 1px solid var(--rule); }
.ledger__n { font-family: var(--serif); color: var(--accent); font-size: 1rem; font-variant-numeric: tabular-nums; }
.ledger__label { font-size: clamp(1.45rem, 2.6vw, 1.8rem); margin-top: 0.35rem; }
.ledger__scope { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); margin-top: 0.35rem; }
.ledger__line { margin-top: 0.8rem; max-width: 30rem; }
.ledger__items { margin-top: 1.1rem; display: grid; gap: 0.65rem; }
.ledger__items li { font-size: 0.95rem; line-height: 1.4; padding-left: 0.9rem; border-left: 2px solid var(--accent); }
.ledger__items a { font-weight: 500; text-decoration: none; }
.ledger__items a:hover { text-decoration: underline; }
.ledger__kind { display: block; color: var(--ink-2); font-size: 0.82rem; margin-top: 0.1rem; }
.ledger__current { margin-top: 1.1rem; font-size: 0.95rem; color: var(--ink-2); }

/* The behaviour layer sits under the ledger, ruled like a total line. */
.layer { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.5rem 3rem; border-top: 3px double var(--ink); margin-top: -1px; padding-block: 1.75rem 0.5rem; }
.layer__label { font-size: clamp(1.3rem, 2.4vw, 1.6rem); }
.layer__text p { margin-top: 0.6rem; color: var(--ink-2); max-width: 32rem; }
.layer__items { margin-top: 0.25rem; }

/* Proof band */
.proof { background: var(--paper-2); padding-block: clamp(3rem, 7vw, 5rem); }
.proof__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr)); gap: 1.25rem; }
.proof__item { background: var(--paper); padding: 1.25rem 1.25rem 1.4rem; border-top: 3px solid var(--accent); }
.proof__item h3 { font-size: 1.15rem; margin-top: 0.5rem; }
.proof__item h3 a { text-decoration: none; }
.proof__item h3 a:hover { text-decoration: underline; }
.proof__item p:last-child { color: var(--ink-2); font-size: 0.93rem; margin-top: 0.55rem; line-height: 1.5; }

/* Teaching (home) */
.teach { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 2rem 3.5rem; padding-block: clamp(3rem, 7vw, 5rem); }
.teach h2 { font-size: clamp(1.6rem, 3.2vw, 2.1rem); }
.teach__text p { margin-top: 0.85rem; max-width: 34rem; }
.teach__text p:first-of-type { color: var(--ink-2); }
.teach__list { display: grid; gap: 1rem; align-content: start; }
.teach__list li { border-top: 1px solid var(--rule); padding-top: 0.9rem; font-family: var(--serif); font-size: 1.15rem; line-height: 1.3; }
.teach__list a { text-decoration: none; }
.teach__list a:hover { text-decoration: underline; }
.teach__list .ledger__kind { font-family: var(--sans); }

/* Latest */
.latest { padding-block: clamp(2.5rem, 6vw, 4rem) clamp(3rem, 8vw, 6rem); border-top: 1px solid var(--rule); }

/* Output lists */
.outputs { border-top: 1px solid var(--ink); }
.output { padding-block: 1.15rem 1.25rem; border-bottom: 1px solid var(--rule); display: grid; gap: 0.35rem; }
.output__meta { display: flex; flex-wrap: wrap; gap: 0.15rem 0.85rem; font-size: 0.8rem; color: var(--ink-2); }
.output__type { color: var(--accent); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.74rem; padding-top: 0.08rem; }
.output__year { font-variant-numeric: tabular-nums; }
.output__title { font-size: 1.2rem; line-height: 1.3; max-width: 52rem; }
.output__title a { text-decoration: none; }
.output__title a:hover { text-decoration: underline; }
.output__summary { color: var(--ink); max-width: 46rem; font-size: 0.97rem; }
.output__authors { color: var(--ink-2); font-size: 0.88rem; }
.output__authors .me { color: var(--ink); font-weight: 600; }
.output__links { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; font-size: 0.85rem; }
.doi { font-family: var(--mono); font-size: 0.8rem; color: var(--ink-2); overflow-wrap: anywhere; }
.outputs--compact .output { padding-block: 0.95rem 1rem; }
.outputs--compact .output__title { font-size: 1.1rem; }

/* Page heads */
.page-head { padding-block: clamp(2.5rem, 7vw, 4.5rem) clamp(1.75rem, 4vw, 2.5rem); }
.page-head h1 { font-size: clamp(2.4rem, 6vw, 3.6rem); font-weight: 400; letter-spacing: -0.02em; }
.lede { font-family: var(--serif); font-size: clamp(1.15rem, 2.2vw, 1.4rem); line-height: 1.45; color: var(--ink-2); margin-top: 0.9rem; max-width: 38rem; }

/* Work filters: radio chips, filtered with :has() (rules are generated in work.njk). */
.work-list { padding-bottom: clamp(3rem, 8vw, 6rem); }
.filters { display: grid; gap: 0.9rem; margin-bottom: 2rem; }
.filters fieldset { border: 0; margin: 0; padding: 0; min-width: 0; display: grid; grid-template-columns: 4.5rem minmax(0, 1fr); gap: 0.5rem; align-items: start; }
.filters legend { float: left; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); padding-top: 0.42rem; }
.chips { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chips input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.chips label { cursor: pointer; font-size: 0.88rem; border: 1px solid var(--rule); border-radius: 999px; padding: 0.28rem 0.75rem; line-height: 1.3; user-select: none; }
.chips label:hover { border-color: var(--ink-2); }
.chips label .n { color: var(--ink-2); font-variant-numeric: tabular-nums; margin-left: 0.15rem; font-size: 0.8rem; }
.chips input:checked + label { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.chips input:checked + label .n { color: inherit; opacity: 0.75; }
.chips input:focus-visible + label { outline: 2px solid var(--focus); outline-offset: 2px; }
.source-note { margin-top: 1.5rem; font-size: 0.9rem; color: var(--ink-2); }

/* Teaching page */
.formats { padding-bottom: clamp(2.5rem, 6vw, 4rem); }
.formats__list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); counter-reset: f; }
.formats__list li { padding: 1.4rem 1.5rem 1.5rem 0; counter-increment: f; }
.formats__list li + li { padding-left: 1.5rem; border-left: 1px solid var(--rule); }
.formats__list li::before { content: "0" counter(f); font-family: var(--serif); color: var(--accent); display: block; margin-bottom: 0.4rem; }
.formats__list h3 { font-size: 1.35rem; }
.formats__list p { margin-top: 0.5rem; color: var(--ink-2); font-size: 0.97rem; }
.teaching main > section + section { margin-bottom: clamp(2.5rem, 6vw, 4rem); }

/* About */
.about-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1.5rem 2.5rem; align-items: end; }
.portrait { width: clamp(7.5rem, 18vw, 11rem); aspect-ratio: 4 / 5; background: var(--paper-2); border: 1px solid var(--rule); display: grid; place-items: center; font-family: var(--serif); font-size: clamp(1.8rem, 4vw, 2.6rem); color: var(--ink-2); }
.bio { max-width: var(--measure); font-family: var(--serif); font-size: clamp(1.15rem, 2vw, 1.3rem); line-height: 1.6; }
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 3rem; padding-block: clamp(2.5rem, 6vw, 3.5rem); }
.facts h2, .contact h2, .press h2 { font-size: 0.8rem; font-family: var(--sans); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); border-top: 1px solid var(--ink); padding-top: 0.85rem; margin-top: 1.75rem; }
.facts__col > h2:first-child { margin-top: 0; }
.plain { margin-top: 0.75rem; display: grid; gap: 0.5rem; }
.contact { padding-bottom: clamp(2rem, 5vw, 3rem); }
.contact__list { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); gap: 1rem 3rem; margin: 0.9rem 0 0; }
.contact__list dt { font-size: 0.85rem; color: var(--ink-2); }
.contact__list dd { margin: 0.15rem 0 0; font-size: 1.05rem; overflow-wrap: anywhere; }
.inline-links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.4rem; margin-top: 1.25rem; font-size: 0.95rem; }
.press { padding-bottom: clamp(3rem, 8vw, 6rem); }
.press > p { margin-top: 0.9rem; color: var(--ink-2); max-width: var(--measure); }
.press__bios { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 1.25rem; margin-top: 1.25rem; }
.bio-card { margin: 0; background: var(--paper-2); padding: 1.25rem 1.35rem; }
.bio-card figcaption { font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); }
.bio-card blockquote { margin: 0.6rem 0 0; font-size: 0.97rem; }

/* Footer */
.colophon { border-top: 1px solid var(--rule); background: var(--paper-2); }
.colophon__inner { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem 2rem; padding-block: 2rem 2.25rem; font-size: 0.9rem; }
.colophon__name { font-family: var(--serif); font-size: 1.1rem; }
.colophon__name span { font-family: var(--sans); font-size: 0.85rem; color: var(--ink-2); }
.colophon__links { display: flex; flex-wrap: wrap; gap: 0.4rem 1.25rem; align-items: start; }
.colophon__fine { grid-column: 1 / -1; color: var(--ink-2); font-size: 0.82rem; }

/* Narrow screens */
@media (max-width: 760px) {
  .ledger, .layer, .teach, .facts, .press__bios, .formats__list { grid-template-columns: minmax(0, 1fr); }
  .ledger__cell, .ledger__cell:nth-child(2n) { padding: 1.5rem 0 1.6rem; border-left: 0; }
  .formats__list li, .formats__list li + li { padding: 1.2rem 0; border-left: 0; border-top: 1px solid var(--rule); }
  .formats__list li:first-child { border-top: 0; }
  .colophon__inner { grid-template-columns: minmax(0, 1fr); }
  .filters fieldset { grid-template-columns: minmax(0, 1fr); }
  .filters legend { padding-top: 0; }
}
@media (max-width: 420px) {
  .about-head { grid-template-columns: minmax(0, 1fr); }
  .nav { gap: 1.1rem; }
}