/* piotrbomba.com
   Look: sprite sheet. Hard outlines, square corners, hard offset shadows,
   monospace headings. Every colour is sampled from the pixel art logo:
   teal shirt, purple spark, peach skin, brown hair, slate trousers, black outline. */
:root {
  color-scheme: light dark;

  /* logo palette */
  --teal: #3b8a84;
  --teal-deep: #26655f;
  --spark: #d566fc;
  --spark-mid: #ae52ca;
  --spark-pale: #ecccf7;
  --spark-deep: #572965;
  --peach: #ffc594;
  --hair: #391700;
  --outline: #140901;
  --slate: #5a5f7d;

  /* roles, light */
  --bg: #fff7ee;
  --panel: #ffffff;
  --ink: var(--outline);
  --muted: var(--slate);
  --line: var(--outline);
  --link: var(--teal-deep);
  --primary: var(--teal-deep);
  --primary-ink: #ffffff;
  --shadow: var(--spark-mid);
  --chip: var(--peach);
  --chip-ink: var(--outline);
  --badge: var(--spark-pale);
  --badge-ink: var(--spark-deep);
  --grid: rgba(57, 23, 0, 0.06);
  --foot-bg: var(--outline);
  --foot-ink: #f3e4d6;
  --foot-link: #8fd6cf;

  /* chart series, validated for colour-blind separation on --panel */
  --c-healthcare: #0c8f83;
  --c-agritech: #ae52ca;
  --c-courses: #8a4a14;
  --c-upwork: #a67c00;
  --c-free: #e9dfd3;

  --px: 4px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a0f1f;
    --panel: #2b1432;
    --ink: #f7ebe0;
    --muted: #c8b9cc;
    --line: var(--spark-pale);
    --link: #7fd1c9;
    --primary: #7fd1c9;
    --primary-ink: var(--outline);
    --shadow: var(--spark-mid);
    --badge: var(--spark-deep);
    --badge-ink: var(--spark-pale);
    --grid: rgba(236, 204, 247, 0.05);
    --foot-bg: #0e0711;
    --c-healthcare: #25a195;
    --c-agritech: #b65ae0;
    --c-courses: #cf7f3c;
    --c-upwork: #e3bd4a;
    --c-free: #4a3352;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

.wrap {
  width: 100%;
  max-width: 64rem;
  margin-inline: auto;
  padding-inline: 1rem;
}

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

.pixel,
.brand img {
  image-rendering: pixelated;
}

a {
  color: var(--link);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--ink);
  text-decoration-color: var(--spark);
}

:focus-visible {
  outline: 3px solid var(--spark);
  outline-offset: 3px;
}

h1,
h2,
h3 {
  font-family: var(--mono);
  line-height: 1.2;
  margin: 0 0 0.75rem;
}

h1 {
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.2rem;
  margin-top: 3rem;
}

h3 {
  font-size: 1.02rem;
}

/* Section headings carry two spark pixels, like the particles in the logo */
main > h2::before,
main > section > h2::before,
.prose > h2::before,
.post > h2::before {
  content: "";
  display: inline-block;
  width: calc(var(--px) * 2);
  height: calc(var(--px) * 2);
  margin-right: calc(var(--px) * 5);
  background: var(--spark);
  box-shadow: calc(var(--px) * 2) calc(var(--px) * -2) 0 var(--spark-mid);
}

p,
ul,
ol,
dl {
  margin: 0 0 1rem;
}

.skip {
  position: absolute;
  left: 0.5rem;
  top: -5rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--primary);
  color: var(--primary-ink);
  font-family: var(--mono);
}

.skip:focus {
  top: 0.5rem;
  color: var(--primary-ink);
}

/* Header */
.site-header {
  border-bottom: 3px solid var(--line);
  background: var(--panel);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding-block: 0.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding-block: 0.25rem;
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 700;
  text-decoration: none;
}

.site-header ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header nav a {
  display: block;
  padding: 0.45rem 0.55rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.85rem;
  text-decoration: none;
}

.site-header nav a:hover {
  background: var(--badge);
  color: var(--badge-ink);
}

.site-header nav a[aria-current] {
  background: var(--chip);
  color: var(--chip-ink);
  font-weight: 700;
}

.main-nav {
  flex-basis: 100%;
  margin-inline: -0.55rem;
}

@media (min-width: 60rem) {
  .main-nav {
    flex-basis: auto;
    order: 2;
    margin-inline: auto 0;
  }

  .lang {
    order: 3;
  }
}

/* Main */
main {
  padding-block: 2rem 4rem;
}

/* Hero: sprite stands on a ground line, over a faint tile grid */
.hero {
  display: grid;
  gap: 1rem;
  margin: -2rem -1rem 0;
  padding: 2rem 1rem 0;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 16px 16px;
  border-bottom: 3px solid var(--line);
}

.hero-text {
  padding-bottom: 2rem;
}

.hero-art {
  order: -1;
  align-self: end;
}

.hero-art img {
  display: block;
  width: 160px;
  margin-bottom: -20px; /* sprite has empty rows under its feet */
}

@media (min-width: 52rem) {
  h1 {
    font-size: 2.1rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  .hero {
    grid-template-columns: 1fr auto;
    align-items: end;
    gap: 2rem;
    padding-top: 3rem;
  }

  .hero-art {
    order: 0;
  }

  .hero-art img {
    width: 320px;
    margin-bottom: -40px;
  }
}

.kicker {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.15rem 0.5rem;
  background: var(--chip);
  color: var(--chip-ink);
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 44rem;
}

.prose {
  max-width: 44rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1.5rem 0;
}

/* Buttons press down into their shadow */
.btn {
  display: inline-block;
  padding: 0.65rem 1rem;
  border: 3px solid var(--line);
  background: var(--primary);
  color: var(--primary-ink);
  font-family: var(--mono);
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--px) var(--px) 0 var(--line);
  transition: transform 0.08s, box-shadow 0.08s;
}

.btn:hover,
.btn:active {
  color: var(--primary-ink);
  transform: translate(var(--px), var(--px));
  box-shadow: 0 0 0 var(--line);
}

.btn.secondary {
  background: var(--panel);
  color: var(--ink);
}

.btn.secondary:hover {
  color: var(--ink);
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
}

.grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
  list-style: none;
  padding: 0;
  margin-right: 6px;
}

@media (min-width: 44rem) {
  .grid {
    grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  }
}

.card {
  padding: 1.25rem;
  border: 3px solid var(--line);
  background: var(--panel);
  box-shadow: 6px 6px 0 var(--shadow);
}

.card.teal {
  box-shadow: 6px 6px 0 var(--teal);
}

.card > :last-child {
  margin-bottom: 0;
}

.card h2,
.card h3 {
  margin-top: 0;
}

.tag {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  background: var(--chip);
  color: var(--chip-ink);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.card h2 {
  font-size: 1.1rem;
}

.card .btn {
  margin-top: 0.25rem;
}

.more {
  margin: 1rem 0 0;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.price s {
  opacity: 0.75;
  font-weight: 400;
  text-decoration-thickness: 2px;
}

/* Availability chart */
.avail {
  margin: 2rem 6px 0 0;
}

.avail-body {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
}

.avail svg {
  flex: none;
  width: 200px;
  height: 200px;
}

.seg-healthcare { stroke: var(--c-healthcare); }
.seg-agritech { stroke: var(--c-agritech); }
.seg-courses { stroke: var(--c-courses); }
.seg-upwork { stroke: var(--c-upwork); }
.seg-free { stroke: var(--c-free); }

.avail-num {
  fill: var(--ink);
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
}

.avail-unit {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
}

.avail table {
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.avail caption {
  padding-bottom: 0.5rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  text-align: left;
}

.avail thead {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.avail th,
.avail td {
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--c-free);
  font-weight: 400;
  text-align: left;
}

.avail td {
  padding-left: 1.5rem;
  font-family: var(--mono);
  font-weight: 700;
  text-align: right;
}

.key {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 0.5rem;
  border: 1px solid var(--line);
}

.key-healthcare { background: var(--c-healthcare); }
.key-agritech { background: var(--c-agritech); }
.key-courses { background: var(--c-courses); }
.key-upwork { background: var(--c-upwork); }
.key-free { background: var(--c-free); }

.patents li {
  margin-bottom: 0.75rem;
}

.patents .post-meta {
  overflow-wrap: anywhere;
}

.prose h3 {
  margin-top: 1.5rem;
}

/* Hobby list: hidden extras. Nothing marks them; the cursor changes on hover
   and a click on the line opens retro pictures. */
.peek summary {
  list-style: none;
  cursor: url("/img/cursor-photo.png") 1 1, pointer;
}

.peek summary::-webkit-details-marker {
  display: none;
}

.peek-pics {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.75rem 6px 1rem 0;
}

.peek-pics img {
  display: block;
  width: 360px;
  max-width: 100%;
  height: auto;
  border: 3px solid var(--line);
  box-shadow: 6px 6px 0 var(--shadow);
}

/* About photos */
.photos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1.5rem;
  list-style: none;
  margin: 1.5rem 6px 0 0;
  padding: 0;
}

.photos img,
.photo-slot {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 3px solid var(--line);
  box-shadow: 6px 6px 0 var(--shadow);
}

.photo-slot {
  display: grid;
  place-items: center;
  padding: 1rem;
  border-style: dashed;
  box-shadow: none;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  text-align: center;
}

/* Pre-order seat meter: one pixel square per seat */
.seats {
  margin: 0 0 1.25rem;
}

.seat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 0.5rem;
}

.seat {
  width: 22px;
  height: 22px;
  border: 3px solid var(--line);
  background: var(--primary);
  box-shadow: 3px 3px 0 var(--shadow);
}

.seat.taken {
  background: transparent;
  border-style: dashed;
  box-shadow: none;
  opacity: 0.55;
}

.seat-text {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--muted);
}

.seat-text strong {
  color: var(--ink);
  font-size: 1.15rem;
}

/* Draft entries, visible only in --preview builds */
.card.draft {
  border-style: dashed;
  box-shadow: none;
}

.steps {
  padding-left: 1.4rem;
}

.steps li {
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}

.steps li::marker {
  font-family: var(--mono);
  font-weight: 700;
}

/* CV download form with the human check */
.cv-gate {
  margin: 0 0 1.25rem;
}

.cv-gate label {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--mono);
  font-size: 0.9rem;
}

.cv-row {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 1rem;
}

.cv-gate input[type="text"] {
  width: 5rem;
  padding: 0.6rem 0.7rem;
  border: 3px solid var(--line);
  border-radius: 0;
  background: var(--panel);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
  text-align: center;
}

button.btn {
  font-size: 1rem;
  line-height: inherit;
  cursor: pointer;
}

/* Awards page */
.awards .result {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--link);
}

.awards .feature {
  grid-column: 1 / -1;
  display: grid;
  gap: 1.25rem;
  box-shadow: 6px 6px 0 var(--teal);
}

.awards .feature img {
  display: block;
  width: 100%;
  border: 3px solid var(--line);
}

.awards .feature h2 {
  font-size: 1.35rem;
}

@media (min-width: 52rem) {
  .awards .feature {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

/* Course materials page */
.videos {
  grid-template-columns: 1fr;
}

.videos video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  border: 3px solid var(--line);
  background: var(--outline);
}

/* Certificate verification page; also prints as the certificate itself */
.cert {
  max-width: 46rem;
  margin: 0 6px 0 0;
  padding: 1.5rem;
  border: 3px solid var(--line);
  background: var(--panel);
  box-shadow: 6px 6px 0 var(--shadow);
}

.cert-logo {
  display: block;
  width: 96px;
  height: 96px;
  margin: -0.75rem 0 0 -0.75rem;
}

.cert h1 {
  margin: 0.25rem 0 0.75rem;
}

.cert-line {
  margin: 1rem 0 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.9rem;
}

.cert-course {
  margin: 0.25rem 0 1.5rem;
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--link);
}

.cert h2 {
  margin-top: 1.5rem;
  font-size: 1.05rem;
}

.cert .facts dd {
  overflow-wrap: anywhere;
}

.cert ul {
  list-style: square;
}

@media print {
  :root {
    color-scheme: light;
    --bg: #ffffff;
    --panel: #ffffff;
    --ink: #140901;
    --muted: #5a5f7d;
    --line: #140901;
    --link: #26655f;
    --chip: #ffc594;
    --chip-ink: #140901;
  }

  @page {
    size: A4;
    margin: 18mm;
  }

  .site-header,
  .site-footer,
  .skip,
  .no-print {
    display: none;
  }

  main {
    padding: 0;
  }

  .cert {
    max-width: none;
    margin: 0;
    padding: 12mm;
    box-shadow: none;
    border-width: 2mm;
  }

  .cert h1 {
    font-size: 30pt;
  }
}

/* Testimonials */
.quotes figure,
.quotes blockquote {
  margin: 0;
}

.quotes blockquote::before {
  content: "";
  display: block;
  width: calc(var(--px) * 2);
  height: calc(var(--px) * 4);
  margin-bottom: 0.75rem;
  background: var(--spark);
  box-shadow: calc(var(--px) * 4) 0 0 var(--spark-mid);
}

.quotes figcaption {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
}

.quotes figcaption strong {
  color: var(--ink);
}

/* Services */
.service {
  margin: 2rem 6px 0 0;
  scroll-margin-top: 1rem;
}

.service h2 {
  font-size: 1.2rem;
}

.num {
  color: var(--muted);
  font-weight: 400;
}

.facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem 1rem;
}

.facts dt {
  color: var(--link);
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding-top: 0.15rem;
}

.facts dd {
  margin: 0 0 0.6rem;
}

@media (min-width: 44rem) {
  .facts {
    grid-template-columns: 9rem 1fr;
  }
}

.facts ul,
.prose ul,
.post ul,
ul.hobbies {
  list-style: square;
}

.facts ul {
  margin: 0;
  padding-left: 1.1rem;
}

li::marker {
  color: var(--spark-mid);
}

.price {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  background: var(--badge);
  color: var(--badge-ink);
  font-family: var(--mono);
  font-weight: 700;
}

/* Tutorials */
.badge {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  background: var(--badge);
  color: var(--badge-ink);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.post-list {
  list-style: none;
  padding: 0;
  max-width: 44rem;
}

.post-list li {
  padding-block: 1.25rem;
  border-bottom: 3px dotted var(--line);
}

.post-list h2 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}

.post-meta {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.post {
  max-width: 44rem;
}

.crumb a {
  display: inline-block;
  padding-block: 0.25rem;
  font-family: var(--mono);
  font-size: 0.9rem;
}

pre {
  overflow-x: auto;
  padding: 1rem;
  border: 3px solid var(--line);
  background: var(--panel);
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
}

/* Contact */
.contact-list {
  list-style: none;
  padding: 0;
}

.contact-list li {
  margin-bottom: 1.25rem;
}

.contact-list strong {
  font-family: var(--mono);
  font-size: 0.85rem;
}

.contact-list a {
  display: inline-block;
  padding-block: 0.15rem;
  font-size: 1.1rem;
}

/* Footer: solid outline-coloured band */
.site-footer {
  padding-block: 1.75rem;
  background: var(--foot-bg);
  color: var(--foot-ink);
  font-family: var(--mono);
  font-size: 0.85rem;
  border-top: 3px solid var(--spark-mid);
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.25rem;
  list-style: none;
  padding: 0;
  margin-bottom: 0.5rem;
}

.site-footer a {
  display: inline-block;
  padding-block: 0.4rem;
  color: var(--foot-link);
}

.site-footer a:hover {
  color: #ffffff;
}

.site-footer p {
  margin-bottom: 0.5rem;
}

/* Questions and answers: one card per question, below the service cards */
.faq {
  margin-top: 2.5rem;
}

.faq .faq-item {
  margin-bottom: 1rem;
}

.faq .faq-item h3 {
  margin-bottom: 0.5rem;
}