/* denisyudin.com — home and portfolio. Typographic index grammar:
   one text size, 12-column grid, sticky aside with filters, tabular list. */
:root {
  --black: #1e1e21;
  --white: #f9f9f9;
  --gray: #d4d4d6;
  --vw: max(.0625rem, .05208vw);          /* 1px up to 1920px wide, then scales */
  --gap: calc(var(--vw) * 12);
  --cols-12: repeat(12, minmax(0, 1fr));
  --cols-8: repeat(8, minmax(0, 1fr));
  --cols-4: repeat(4, minmax(0, 1fr));
  --cols-3: repeat(3, minmax(0, 1fr));
  --cols-2: repeat(2, minmax(0, 1fr));
  --ease: cubic-bezier(.47, .12, .38, 1);
}
* { box-sizing: border-box; }
html { background: var(--white); scrollbar-width: none; overscroll-behavior: none; }
html::-webkit-scrollbar { display: none; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  font-size: max(12px, calc(var(--vw) * 12));
  line-height: 1.25;
  letter-spacing: 0;
  color: var(--black);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: geometricPrecision;
}
h1, h2, h3, p, ul, li, figure { margin: 0; padding: 0; font: inherit; }
ul { list-style: none; }
a { color: inherit; text-decoration: none; text-decoration-thickness: from-font; transition: opacity .2s var(--ease), color .2s var(--ease); }
a:focus-visible, .a-i:focus-visible { outline: 1px solid currentColor; outline-offset: 2px; }
.a-i { cursor: pointer; transition: opacity .2s var(--ease); }
@media (hover: hover) {
  a:hover, .a-i:hover { opacity: .5; }
}
.u { text-decoration: underline; text-underline-offset: .12em; text-decoration-thickness: from-font; }
.i { font-style: italic; }
.mono { font-variant-numeric: tabular-nums slashed-zero; font-feature-settings: "tnum" 1; }
.hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(100%); white-space: nowrap; }
::selection { background: var(--black); color: var(--white); }

/* Navigation: fixed, centered, inverts over images */
.nav {
  position: fixed; top: calc(var(--vw) * 7); left: 0; z-index: 1000;
  width: 100%; display: flex; justify-content: center;
  color: #fff; mix-blend-mode: difference; pointer-events: none;
  padding-inline: var(--gap);
}
.nav__list { display: flex; flex-wrap: wrap; justify-content: center; column-gap: calc(var(--vw) * 6); pointer-events: auto; width: max-content; max-width: 100%; }
.nav__item { display: inline-flex; gap: .25em; white-space: nowrap; }
.nav__desc { white-space: normal; }
.nav__item.is-current a { text-decoration: underline; text-underline-offset: .12em; }
.nav__item--menu { align-items: center; height: 1.25em; }
.nav__item--menu dy-tool-menu { display: inline-flex; }

/* Page grid */
.container {
  margin-top: calc(var(--vw) * 36);
  padding-inline: var(--gap);
  display: grid; grid-template-columns: var(--cols-12); column-gap: var(--gap);
  align-content: start; width: 100%; min-height: 100svh;
}

/* Aside: sticky, centered titles, flush-left lists */
.aside {
  grid-column: span 4; position: sticky; top: calc(var(--vw) * 36);
  height: max-content; display: flex; flex-direction: column; row-gap: calc(var(--vw) * 36);
}
.aside__block { display: flex; flex-direction: column; align-items: center; }
.aside__title { text-align: center; }
.aside__text { width: 100%; }
.aside__text p + p { margin-top: calc(var(--vw) * 12); }
.aside__text a { text-decoration: underline; text-underline-offset: .12em; }
.aside__list { width: 100%; display: flex; flex-wrap: wrap; }
.aside__list > li { flex-shrink: 0; white-space: pre-wrap; }
.filter > li { cursor: pointer; }
.filter > li.is-selected .a-i { text-decoration: underline; text-underline-offset: .12em; }
.filter__all { opacity: 0; pointer-events: none; cursor: pointer; transition: opacity .4s var(--ease); }
.filter__all.is-visible { opacity: 1; pointer-events: auto; }

/* Index list: header of single letters, rows as links */
.index {
  grid-column: 5 / -1; display: grid; grid-template-columns: var(--cols-8); column-gap: var(--gap);
  align-content: start; position: relative;
}
.index__header, .index__body, .index__row {
  grid-column: 1 / -1; display: grid; grid-template-columns: var(--cols-8); column-gap: var(--gap); align-content: start;
}
.index__row > * { min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.index__row { transition: opacity .2s var(--ease), color .4s var(--ease); }
.index__row.is-muted { color: var(--gray); }
@media (hover: hover) { .index__row:hover { opacity: .7; } }
.index__header > * { position: relative; z-index: 1; }
.index__header span { display: block; color: var(--white); white-space: nowrap; }
.index__header span::first-letter { color: var(--black); }
.index__header > :hover span { color: var(--black); }
.index:has(.index__row > :nth-child(1):hover) .index__header > :nth-child(1) span,
.index:has(.index__row > :nth-child(2):hover) .index__header > :nth-child(2) span,
.index:has(.index__row > :nth-child(3):hover) .index__header > :nth-child(3) span,
.index:has(.index__row > :nth-child(4):hover) .index__header > :nth-child(4) span,
.index:has(.index__row > :nth-child(5):hover) .index__header > :nth-child(5) span,
.index:has(.index__row > :nth-child(6):hover) .index__header > :nth-child(6) span { color: var(--black); }
/* column spans: home = N1 P2 D3 T1 Y1; portfolio = N1 P2 D2 T1 L1 Y1 */
.index--home .index__header > :nth-child(1), .index--home .index__row > :nth-child(1) { grid-column: span 1; }
.index--home .index__header > :nth-child(2), .index--home .index__row > :nth-child(2) { grid-column: span 2; }
.index--home .index__header > :nth-child(3), .index--home .index__row > :nth-child(3) { grid-column: span 3; }
.index--home .index__header > :nth-child(4), .index--home .index__row > :nth-child(4),
.index--home .index__header > :nth-child(5), .index--home .index__row > :nth-child(5) { grid-column: span 1; }
.index--works .index__header > :nth-child(1), .index--works .index__row > :nth-child(1) { grid-column: span 1; }
.index--works .index__header > :nth-child(2), .index--works .index__row > :nth-child(2),
.index--works .index__header > :nth-child(3), .index--works .index__row > :nth-child(3) { grid-column: span 2; }
.index--works .index__header > :nth-child(4), .index--works .index__row > :nth-child(4),
.index--works .index__header > :nth-child(5), .index--works .index__row > :nth-child(5),
.index--works .index__header > :nth-child(6), .index--works .index__row > :nth-child(6) { grid-column: span 1; }

/* CV as an index: N1 P2 D4 S1, descriptions wrap; NDA rows are not links */
.index--cv .index__header > :nth-child(1), .index--cv .index__row > :nth-child(1) { grid-column: span 1; }
.index--cv .index__header > :nth-child(2), .index--cv .index__row > :nth-child(2) { grid-column: span 2; }
.index--cv .index__header > :nth-child(3), .index--cv .index__row > :nth-child(3) { grid-column: span 4; }
.index--cv .index__header > :nth-child(4), .index--cv .index__row > :nth-child(4) { grid-column: span 1; }
.index--cv .index__row > :nth-child(2), .index--cv .index__row > :nth-child(3) { white-space: normal; overflow: visible; }
.index--cv .index__body { row-gap: calc(var(--vw) * 8); }
.index--cv .index__row:hover { opacity: 1; }
.index__row a { text-decoration: underline; text-underline-offset: .12em; }
.index__row--nda { cursor: default; }
.index__row--nda:hover { opacity: 1; }

/* Covers (portfolio) */
.covers {
  grid-column: 5 / -1; margin-top: calc(var(--vw) * 60);
  display: grid; grid-template-columns: var(--cols-8); column-gap: var(--gap); row-gap: calc(var(--vw) * 24);
}
.cover { grid-column: span 4; display: block; transition: opacity .4s var(--ease); }
.cover.is-muted { opacity: .15; }
.cover img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; background: #ececec; }
.cover figcaption { display: flex; gap: var(--gap); margin-top: calc(var(--vw) * 6); }
.cover figcaption > :first-child { flex: 0 0 calc((100% - 3 * var(--gap)) / 4); }
.cover figcaption > :last-child { margin-left: auto; }

/* Footer */
.footer {
  grid-column: 1 / -1; margin-top: calc(var(--vw) * 180); padding-bottom: calc(var(--vw) * 7);
  display: grid; grid-template-columns: var(--cols-3); gap: var(--gap);
}
.footer > :first-child, .footer > :last-child { display: flex; flex-direction: column; row-gap: calc(var(--vw) * 12); }
.footer > :first-child { grid-column: span 2; }
.footer > :last-child { grid-column: span 1; }
.footer__nav { display: flex; flex-wrap: wrap; column-gap: calc(var(--vw) * 6); }
.footer__nav-item { display: inline-flex; gap: .25em; }
.footer__links { display: flex; flex-wrap: wrap; column-gap: calc(var(--vw) * 6); }

/* Profile grammar (cv): centered title over the text column, numbered notes on the right */
.profile { grid-column: 1 / -1; display: grid; grid-template-columns: var(--cols-12); column-gap: var(--gap); row-gap: calc(var(--vw) * 90); align-content: start; }
.sec { grid-column: 1 / -1; display: grid; grid-template-columns: var(--cols-12); column-gap: var(--gap); align-content: start; }
.sec__title { grid-column: 1 / 9; grid-row: 1; text-align: center; }
.sec__text { grid-column: 1 / 9; grid-row: 2; }
.sec__text p + p { margin-top: calc(var(--vw) * 12); }
.sec__text a { text-decoration: underline; text-underline-offset: .12em; }
.sec__notes, .sec__links { grid-column: 9 / -1; grid-row: 2; }
.sec__notes { display: flex; flex-direction: column; }
.note { position: relative; }
.note__n { position: absolute; left: 0; top: 0; }
.note p { text-indent: calc((100% - 3 * var(--gap)) / 4 + var(--gap)); }
.note p a { text-decoration: underline; text-underline-offset: .12em; }
.sec__links { display: flex; flex-wrap: wrap; column-gap: calc(var(--vw) * 6); padding-left: calc((100% - 3 * var(--gap)) / 4 + var(--gap)); }
sup { font-size: .7em; line-height: 0; vertical-align: baseline; position: relative; top: -.5em; margin-left: .08em; }

/* Mobile */
@media (width <= 768px) {
  body { font-size: 13px; }
  .nav { padding-inline: var(--gap); }
  .nav__desc { display: none; }
  .container { display: flex; flex-direction: column; gap: calc(var(--vw) * 40); margin-top: calc(var(--vw) * 48); }
  .aside { position: relative; top: 0; display: grid; grid-template-columns: var(--cols-4); column-gap: var(--gap); row-gap: calc(var(--vw) * 36); }
  .aside__block { grid-column: 1 / -1; display: grid; grid-template-columns: var(--cols-4); column-gap: var(--gap); }
  .aside__title, .filter__all { grid-column: 1 / 3; text-align: center; }
  .aside__text, .aside__list { grid-column: 1 / -1; }
  .index, .covers { grid-column: 1 / -1; }
  .index__header { display: none; }
  .index, .index__body, .index__row { grid-template-columns: var(--cols-4); }
  .index__row { row-gap: 0; padding-block: calc(var(--vw) * 2); }
  .index__row.is-muted { display: none; }
  .index__row > * { grid-row: 1; }
  .index__row > :nth-child(1) { display: none; }
  .index__row > :nth-child(3) { grid-row: 2; grid-column: 1 / -1; white-space: normal; color: #7a7a7d; }
  .index--home .index__row > :nth-child(2) { grid-column: 1 / 3; }
  .index--home .index__row > :nth-child(4) { grid-column: 3; }
  .index--home .index__row > :nth-child(5) { grid-column: 4; }
  .index--works .index__row > :nth-child(2) { grid-column: 1 / 3; }
  .index--works .index__row > :nth-child(4) { grid-column: 3; }
  .index--works .index__row > :nth-child(5) { display: none; }
  .index--works .index__row > :nth-child(6) { grid-column: 4; }
  .index--cv .index__row > :nth-child(2) { grid-column: 1 / 4; }
  .index--cv .index__row > :nth-child(4) { grid-column: 4; }
  .covers { margin-top: calc(var(--vw) * 24); grid-template-columns: var(--cols-4); row-gap: calc(var(--vw) * 24); }
  .cover { grid-column: 1 / -1; }
  .cover.is-muted { display: none; }
  .profile { display: flex; flex-direction: column; gap: calc(var(--vw) * 48); }
  .sec { display: flex; flex-direction: column; gap: calc(var(--vw) * 10); }
  .sec__title { text-align: center; }
  .sec__notes { gap: calc(var(--vw) * 6); margin-top: calc(var(--vw) * 6); }
  .sec__links { padding-left: 0; }
  .footer { margin-top: calc(var(--vw) * 96); grid-template-columns: var(--cols-2); }
  .footer > :first-child, .footer > :last-child { grid-column: span 1; }
  .footer__nav { flex-direction: column; }
  .footer__nav-number { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  a, .a-i, .index__row, .cover, .filter__all { transition: none; }
}