/*
Theme Name: Vlakh Monochrome
Theme URI: https://vlakh.com/
Author: Vitalii Vlakh and Codex
Author URI: https://vlakh.com/
Description: A monochrome engineering portfolio theme for publications, patents, software, and research projects.
Version: 1.0.0
Requires at least: 6.2
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: vlakh-monochrome
*/

:root {
  --color-ink: #080808;
  --color-paper: #ffffff;
  --color-soft: #f4f4f1;
  --color-line: #d6d6d0;
  --color-muted: #64645f;
  --color-dim: #a8a8a0;
  --color-panel: #111111;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --site-width: 1180px;
  --gutter: 24px;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover,
a:focus-visible {
  color: var(--color-muted);
}

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

button,
input,
textarea,
select {
  font: inherit;
}

::selection {
  background: var(--color-ink);
  color: var(--color-paper);
}

.screen-reader-text,
.skip-link {
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

.skip-link:focus {
  clip: auto;
  clip-path: none;
  height: auto;
  left: 16px;
  padding: 10px 14px;
  top: 16px;
  width: auto;
  z-index: 1000;
  background: var(--color-paper);
  border: 1px solid var(--color-ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(16px);
}

.admin-bar .site-header {
  top: 32px;
}

.site-header__inner,
.section__inner,
.site-footer__inner {
  width: min(var(--site-width), calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--color-ink);
  background: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
}

.brand__name {
  display: block;
  font-size: 16px;
  font-weight: 750;
  line-height: 1.1;
}

.brand__role {
  display: block;
  margin-top: 3px;
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 10px;
  color: var(--color-ink);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav .current-menu-item > a,
.site-nav .current_page_item > a,
.site-nav a:hover,
.site-nav a:focus-visible {
  background: var(--color-ink);
  color: var(--color-paper);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-ink);
  background: var(--color-paper);
  color: var(--color-ink);
  cursor: pointer;
}

.menu-toggle__bars,
.menu-toggle__bars::before,
.menu-toggle__bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  content: "";
}

.menu-toggle__bars {
  position: relative;
}

.menu-toggle__bars::before,
.menu-toggle__bars::after {
  position: absolute;
  left: 0;
}

.menu-toggle__bars::before {
  top: -6px;
}

.menu-toggle__bars::after {
  top: 6px;
}

.hero {
  position: relative;
  isolation: isolate;
  min-height: 690px;
  color: var(--color-paper);
  background-image: var(--hero-image);
  background-position: center right;
  background-size: cover;
  filter: grayscale(1);
}

.hero::before {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.82) 0%, rgba(0, 0, 0, 0.7) 46%, rgba(0, 0, 0, 0.4) 100%);
  content: "";
}

.hero::after {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.13) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 72px 72px;
  content: "";
  opacity: 0.22;
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  align-content: end;
  min-height: 690px;
  width: min(var(--site-width), calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
  padding: 96px 0 72px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.eyebrow::before {
  display: block;
  width: 42px;
  height: 1px;
  background: currentColor;
  content: "";
}

.hero h1,
.page-hero h1,
.entry-hero h1 {
  max-width: 900px;
  margin: 18px 0 18px;
  font-size: 64px;
  font-weight: 800;
  line-height: 1.02;
}

.hero__statement {
  max-width: 720px;
  margin: 0 0 32px;
  color: rgba(255, 255, 255, 0.88);
  font-size: 20px;
  line-height: 1.55;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button,
.wp-block-button__link,
input[type="submit"],
button[type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--color-ink);
  border-radius: 0;
  background: var(--color-ink);
  color: var(--color-paper);
  font-size: 13px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
}

.button:hover,
.button:focus-visible,
.wp-block-button__link:hover,
.wp-block-button__link:focus-visible,
input[type="submit"]:hover,
button[type="submit"]:hover {
  background: var(--color-paper);
  color: var(--color-ink);
}

.button--light {
  border-color: var(--color-paper);
  background: var(--color-paper);
  color: var(--color-ink);
}

.button--light:hover,
.button--light:focus-visible {
  background: transparent;
  color: var(--color-paper);
}

.button--ghost {
  background: transparent;
  color: var(--color-ink);
}

.button--ghost:hover,
.button--ghost:focus-visible {
  background: var(--color-ink);
  color: var(--color-paper);
}

.hero .button--ghost {
  border-color: rgba(255, 255, 255, 0.8);
  color: var(--color-paper);
}

.hero .button--ghost:hover,
.hero .button--ghost:focus-visible {
  background: var(--color-paper);
  color: var(--color-ink);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: min(860px, 100%);
  margin-top: 64px;
  background: rgba(255, 255, 255, 0.32);
}

.hero__stat {
  min-height: 112px;
  padding: 18px;
  background: rgba(0, 0, 0, 0.44);
}

.hero__stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.1;
}

.hero__stat span {
  display: block;
  margin-top: 6px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
}

.section {
  padding: 88px 0;
  border-top: 1px solid var(--color-line);
}

.section--paper {
  background: var(--color-paper);
}

.section--soft {
  background:
    linear-gradient(90deg, rgba(8, 8, 8, 0.035) 1px, transparent 1px),
    var(--color-soft);
  background-size: 36px 36px;
}

.section--dark {
  background: var(--color-ink);
  color: var(--color-paper);
}

.section__head {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 36px;
}

.section__kicker,
.entry-kicker {
  display: block;
  margin-bottom: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.section--dark .section__kicker {
  color: var(--color-dim);
}

.section h2,
.page-content h2 {
  margin: 0;
  font-size: 38px;
  line-height: 1.12;
}

.section__intro {
  margin: 0;
  color: var(--color-muted);
  font-size: 18px;
  line-height: 1.55;
}

.section--dark .section__intro,
.section--dark .meta,
.section--dark .card__meta {
  color: var(--color-dim);
}

.grid {
  display: grid;
  gap: 18px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-paper);
}

.section--dark .card {
  border-color: rgba(255, 255, 255, 0.18);
  background: #151515;
}

.card__image {
  aspect-ratio: 16 / 10;
  width: 100%;
  margin: -24px -24px 20px;
  max-width: calc(100% + 48px);
  object-fit: cover;
  filter: grayscale(1);
  border-bottom: 1px solid var(--color-line);
}

.card__kicker,
.meta {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  text-transform: uppercase;
}

.card h3 {
  margin: 8px 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

.card h3 a {
  text-decoration: none;
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0 0 12px;
  color: var(--color-muted);
  font-size: 13px;
}

.card__body {
  color: var(--color-muted);
}

.card__body p {
  margin: 0;
}

.card .actions {
  margin-top: auto;
  padding-top: 22px;
}

.capability {
  min-height: 240px;
  padding: 38px 28px 28px;
  border-top: 2px solid var(--color-ink);
  background: var(--color-paper);
}

.capability h3 {
  margin: 0 0 14px;
  font-size: 24px;
  line-height: 1.2;
}

.capability p {
  margin: 0;
  color: var(--color-muted);
}

.section__cta {
  margin-top: 32px;
}

/* Action buttons must stay legible on dark sections. */
.section--dark .button {
  border-color: var(--color-paper);
  background: var(--color-paper);
  color: var(--color-ink);
}

.section--dark .button:hover,
.section--dark .button:focus-visible {
  background: transparent;
  color: var(--color-paper);
}

.section--dark .button--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.7);
  color: var(--color-paper);
}

.section--dark .button--ghost:hover,
.section--dark .button--ghost:focus-visible {
  background: var(--color-paper);
  color: var(--color-ink);
}

/* Long publication/patent titles should not use the full display size. */
.single-vlakh_publication .entry-hero h1,
.single-vlakh_patent .entry-hero h1 {
  max-width: 940px;
  font-size: 34px;
  font-weight: 800;
  line-height: 1.14;
}

/* Rich single-entry content: figures, galleries, certificate strips. */
.entry-content figure {
  margin: 34px 0;
}

.entry-content figure img {
  width: 100%;
  border: 1px solid var(--color-line);
  background: var(--color-soft);
}

.entry-content figcaption {
  margin-top: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
}

.patent-figure {
  width: min(920px, 100%);
  margin: 0 auto 36px;
}

.publication-figure {
  width: min(920px, 100%);
  margin: 0 auto 42px;
}

.publication-figure img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: grayscale(1);
}

.patent-figure img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: grayscale(1);
}

.entry-keywords {
  padding-top: 6px;
  color: var(--color-muted);
}

.entry-citation {
  padding: 18px 20px;
  border-left: 2px solid var(--color-ink);
  background: var(--color-soft);
  font-size: 15px;
  word-break: break-word;
}

.media-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 34px 0;
}

.media-gallery figure {
  margin: 0;
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 34px;
}

.cert-grid a {
  display: block;
  border: 1px solid var(--color-line);
  background: var(--color-soft);
}

.cert-grid img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: grayscale(1);
  transition: filter 0.2s ease;
}

.cert-grid a:hover img,
.cert-grid a:focus-visible img {
  filter: grayscale(0);
}

.page-hero,
.entry-hero {
  padding: 92px 0 58px;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-soft);
}

.page-hero__inner,
.entry-hero__inner {
  width: min(var(--site-width), calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
}

.page-hero p,
.entry-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--color-muted);
  font-size: 18px;
}

.archive-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 42px;
}

.archive-aside {
  position: sticky;
  top: 112px;
  align-self: start;
  padding-top: 4px;
}

.archive-aside__panel {
  border-left: 2px solid var(--color-ink);
  padding-left: 18px;
}

.archive-aside p {
  margin: 0 0 18px;
  color: var(--color-muted);
}

.list {
  display: grid;
  gap: 14px;
}

.list-card {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 24px;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-paper);
}

.list-card__year {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.list-card h2,
.list-card h3 {
  margin: 0 0 8px;
  font-size: 24px;
  line-height: 1.25;
}

.list-card h2 a,
.list-card h3 a {
  text-decoration: none;
}

.list-card__summary {
  color: var(--color-muted);
}

.list-card__summary p {
  margin: 0;
}

.list-card .actions {
  margin-top: 18px;
}

.entry-content,
.page-content {
  width: min(850px, calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
  padding: 64px 0;
}

.entry-content > *:first-child,
.page-content > *:first-child {
  margin-top: 0;
}

.entry-content > *:last-child,
.page-content > *:last-child {
  margin-bottom: 0;
}

.entry-content h2,
.entry-content h3,
.page-content h2,
.page-content h3 {
  line-height: 1.18;
}

.entry-content h2,
.page-content h2 {
  margin-top: 48px;
}

.entry-content h3,
.page-content h3 {
  margin-top: 34px;
}

.entry-content p,
.page-content p {
  margin: 0 0 1.2em;
}

.entry-content ul,
.entry-content ol,
.page-content ul,
.page-content ol {
  padding-left: 1.35em;
}

.entry-content table,
.page-content table {
  width: 100%;
  border-collapse: collapse;
}

.entry-content td,
.entry-content th,
.page-content td,
.page-content th {
  padding: 12px;
  border: 1px solid var(--color-line);
  vertical-align: top;
}

.entry-media {
  width: min(var(--site-width), calc(100% - (var(--gutter) * 2)));
  margin: 0 auto;
  padding-top: 52px;
}

.entry-media img {
  width: 100%;
  max-height: 620px;
  object-fit: cover;
  filter: grayscale(1);
}

.details {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 34px;
  background: var(--color-line);
}

.detail {
  padding: 16px;
  background: var(--color-paper);
}

.detail dt {
  margin: 0 0 4px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
}

.detail dd {
  margin: 0;
  font-weight: 700;
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
}

.pagination .page-numbers {
  display: inline-flex;
  min-width: 40px;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  color: var(--color-ink);
  text-decoration: none;
}

.pagination .current,
.pagination a:hover,
.pagination a:focus-visible {
  border-color: var(--color-ink);
  background: var(--color-ink);
  color: var(--color-paper);
}

.empty-state {
  padding: 32px;
  border: 1px dashed var(--color-muted);
  color: var(--color-muted);
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 8px 10px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
}

.social-links a:hover,
.social-links a:focus-visible {
  background: currentColor;
}

.social-links a:hover span,
.social-links a:focus-visible span {
  color: var(--color-paper);
}

.site-footer {
  background: var(--color-ink);
  color: var(--color-paper);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 42px;
  padding: 54px 0;
}

.site-footer p {
  margin: 0;
  color: var(--color-dim);
}

.site-footer a {
  color: var(--color-paper);
}

.site-footer .brand__mark {
  border-color: var(--color-paper);
  background: var(--color-paper);
  color: var(--color-ink);
}

.site-footer .brand__role,
.site-footer .meta {
  color: var(--color-dim);
}

.footer-nav ul {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav a {
  text-decoration: none;
}

.wp-caption {
  max-width: 100%;
}

.wp-caption-text {
  color: var(--color-muted);
  font-size: 13px;
  text-align: left;
}

.aligncenter {
  margin-left: auto;
  margin-right: auto;
}

.alignleft {
  float: left;
  margin: 0 24px 16px 0;
}

.alignright {
  float: right;
  margin: 0 0 16px 24px;
}

@media (max-width: 980px) {
  .admin-bar .site-header {
    top: 46px;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: 72px 0 auto;
    display: none;
    max-height: calc(100vh - 72px);
    overflow: auto;
    border-bottom: 1px solid var(--color-line);
    background: var(--color-paper);
  }

  .menu-open .site-nav {
    display: block;
  }

  .site-nav ul {
    display: grid;
    gap: 0;
    width: min(var(--site-width), calc(100% - (var(--gutter) * 2)));
    margin: 0 auto;
    padding: 18px 0;
  }

  .site-nav a {
    min-height: 48px;
    border-bottom: 1px solid var(--color-line);
  }

  .hero,
  .hero__inner {
    min-height: 620px;
  }

  .hero h1,
  .page-hero h1,
  .entry-hero h1 {
    font-size: 48px;
  }

  .hero__meta,
  .grid--4,
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section__head,
  .archive-layout,
  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .archive-aside {
    position: static;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
  }

  .brand__role {
    display: none;
  }

  .hero,
  .hero__inner {
    min-height: 590px;
  }

  .hero__inner {
    padding: 72px 0 40px;
  }

  .hero h1,
  .page-hero h1,
  .entry-hero h1 {
    font-size: 36px;
  }

  .hero__statement,
  .section__intro,
  .page-hero p,
  .entry-hero p {
    font-size: 16px;
  }

  .hero__meta,
  .grid--4,
  .grid--3,
  .grid--2,
  .media-gallery,
  .details {
    grid-template-columns: 1fr;
  }

  .cert-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .single-vlakh_publication .entry-hero h1,
  .single-vlakh_patent .entry-hero h1 {
    font-size: 26px;
  }

  .section {
    padding: 60px 0;
  }

  .section h2,
  .page-content h2 {
    font-size: 30px;
  }

  .list-card {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .entry-content,
  .page-content {
    padding: 44px 0;
  }

  .site-footer__inner {
    padding: 42px 0;
  }
}