/* Algorithms and Utilities page: "The workshop / blueprint". Blueprint blue, muted green for active states. */
:root {
  --bg: #0a1726;
  --surface: rgba(11, 29, 50, 0.86);
  --surface-strong: rgba(15, 37, 62, 0.96);
  --card-bg: #0b1d32;
  --line: rgba(140, 185, 255, 0.2);
  --text: #e6effa;
  --muted: #93a9c4;
  --accent: #5aa2ff;
  --active: #7cc4a0;
  --bp-minor: rgba(120, 170, 255, 0.05);
  --bp-major: rgba(120, 170, 255, 0.1);
  --bp-bracket: rgba(160, 200, 255, 0.55);
  --viz-line: rgba(120, 170, 255, 0.12);
  --viz-node: rgba(150, 190, 255, 0.35);
  --viz-visited: rgba(90, 162, 255, 0.55);
  --viz-frontier: rgba(124, 196, 160, 0.6);
  --viz-path: rgba(124, 196, 160, 0.8);
  --viz-goal: rgba(242, 165, 65, 0.85);
  --viz-bar: rgba(90, 162, 255, 0.18);
  --radius: 8px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #edf3fb;
    --surface: rgba(255, 255, 255, 0.88);
    --surface-strong: rgba(255, 255, 255, 0.97);
    --card-bg: #fff;
    --line: rgba(31, 102, 201, 0.22);
    --text: #0f2138;
    --muted: #4a5f7a;
    --accent: #1f66c9;
    --active: #2f7d5b;
    --bp-minor: rgba(31, 102, 201, 0.05);
    --bp-major: rgba(31, 102, 201, 0.1);
    --bp-bracket: rgba(31, 102, 201, 0.55);
    --viz-line: rgba(31, 102, 201, 0.14);
    --viz-node: rgba(31, 102, 201, 0.35);
    --viz-visited: rgba(31, 102, 201, 0.5);
    --viz-frontier: rgba(47, 125, 91, 0.6);
    --viz-path: rgba(47, 125, 91, 0.75);
    --viz-goal: rgba(154, 90, 6, 0.8);
    --viz-bar: rgba(31, 102, 201, 0.14);
  }
}

/* Blueprint paper: a fine grid with a stronger line every fifth square. */
body {
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--bp-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-major) 1px, transparent 1px),
    linear-gradient(var(--bp-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-minor) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  background-repeat: repeat;
  background-attachment: fixed;
}

/* The running algorithm stays well in the background. */
#bg {
  opacity: 0.6;
}

h1,
h2,
h3,
.kicker {
  font-family: var(--mono);
}

/* Intro */
.workshop-intro,
.workshop-projects {
  max-width: 1120px;
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}

.workshop-intro {
  display: grid;
  gap: 28px;
  padding-top: calc(var(--header-h) + 56px);
  padding-bottom: 12px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--active);
  font-size: 0.9rem;
}

.workshop-intro h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.brace {
  color: var(--accent);
  font-weight: 400;
}

.lead {
  max-width: 60ch;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.7;
}

.title-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-self: end;
  margin: 0;
  border: 1.5px solid var(--bp-bracket);
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.title-block div {
  padding: 8px 12px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.title-block div:nth-child(2n) {
  border-right: none;
}

.title-block .title-block-wide {
  grid-column: 1 / -1;
  border-right: none;
  border-bottom: none;
}

.title-block dt {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.title-block dd {
  margin: 2px 0 0;
  color: var(--text);
}

#viz-stats {
  color: var(--active);
}

/* Pause and Next sit to the right of the "Now" line. */
.title-block .title-block-now {
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: 12px;
  align-items: center;
}

.title-block-now dt,
.title-block-now #viz-stats {
  grid-column: 1;
}

.title-block .viz-controls {
  display: flex;
  grid-column: 2;
  grid-row: 1 / span 2;
  gap: 6px;
  margin: 0;
}

.title-block .viz-controls[hidden] {
  display: none;
}

.viz-button {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.74rem;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.viz-button:hover {
  border-color: var(--active);
  color: var(--active);
}

/* Filters */
.workshop-projects {
  padding-top: 36px;
  padding-bottom: 72px;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.85rem;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.chip:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--text);
}

.chip[aria-pressed="true"] {
  border-color: var(--active);
  box-shadow: inset 0 0 0 1px var(--active);
  color: var(--text);
}

.chip:disabled {
  cursor: default;
  opacity: 0.45;
}

.chip-count {
  color: var(--accent);
  font-size: 0.78rem;
}

.chip[aria-pressed="true"] .chip-count {
  color: var(--active);
}

.filter-status {
  margin: 14px 0 22px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.filter-status::before {
  content: "> ";
  color: var(--active);
}

/* Blueprint cards: corner brackets, and a scan line over the image on hover.
   Opaque, so the running algorithm doesn't show through the text. */
.page-algorithms .project-card {
  --card-accent: var(--accent);
  position: relative;
  background: var(--card-bg);
}

.page-algorithms .project-card::after {
  content: "";
  position: absolute;
  inset: 6px;
  pointer-events: none;
  background:
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) left top / 14px 2px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) left top / 2px 14px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) right top / 14px 2px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) right top / 2px 14px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) left bottom / 14px 2px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) left bottom / 2px 14px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) right bottom / 14px 2px,
    linear-gradient(var(--bp-bracket), var(--bp-bracket)) right bottom / 2px 14px;
  background-repeat: no-repeat;
  transition: inset 0.25s ease;
}

.page-algorithms .project-card:hover::after,
.page-algorithms .project-card.is-open::after {
  --bp-bracket: var(--active);
  inset: 3px;
}

.page-algorithms .project-card:hover,
.page-algorithms .project-card.is-open {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--line));
}

.page-algorithms .project-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(to bottom, transparent 0 3px, rgba(140, 200, 255, 0.08) 3px 4px);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.page-algorithms .project-media::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1;
  height: 30%;
  background: linear-gradient(to bottom, transparent, color-mix(in srgb, var(--active) 22%, transparent), transparent);
  opacity: 0;
  translate: 0 -100%;
}

.page-algorithms .project-card:hover .project-media::after {
  opacity: 1;
}

.page-algorithms .project-card:hover .project-media::before {
  opacity: 1;
  animation: scan 1.8s linear infinite;
}

@keyframes scan {
  from { translate: 0 -100%; }
  to { translate: 0 340%; }
}

.page-algorithms .project-toggle {
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 0.82rem;
}

.page-algorithms .project-toggle::before {
  content: "$ ";
  color: var(--active);
}

.page-algorithms .project-toggle:hover {
  border-color: var(--active);
}

.page-algorithms .project-toggle[aria-expanded="true"] {
  border-color: var(--active);
}

.page-algorithms .project-complexity::before {
  content: "complexity: ";
  color: var(--muted);
}

@media (min-width: 720px) {
  .workshop-intro,
  .workshop-projects {
    padding-left: 28px;
    padding-right: 28px;
  }
}

@media (min-width: 900px) {
  .workshop-intro {
    grid-template-columns: minmax(0, 1fr) 340px;
    align-items: end;
  }
}