/* ─────────────────────────────────────────────────────────────
   Introduction to ComfyUI
   Aesthetic adapted from ucm.datadesignandart.ch
   Helvetica Neue · Bold · 22/26.4 · gray on gray · hairlines
   ───────────────────────────────────────────────────────────── */

:root {
  --bg:         #d3d3d3;
  --fg:         #000000;
  --rule:       #000000;
  --frame:      #00000018;

  --u:          0.25rem; /* 4 px base unit */

  --s-neg2:     calc(var(--u) * -2);
  --s-2:        calc(var(--u) * 2);
  --s-3:        calc(var(--u) * 3);
  --s-4:        calc(var(--u) * 4);
  --s-6:        calc(var(--u) * 6);
  --s-8:        calc(var(--u) * 8);
  --s-12:       calc(var(--u) * 12);
  --s-16:       calc(var(--u) * 16);

  --gutter:     var(--s-4);

  --font-sans:  "Helvetica Neue", "Helvetica", "Arial", sans-serif;
  --font-mono:  ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --fs-body:    1.375rem;
  --lh-body:    1.65rem;
  --ls-body:    0.01375rem;

  --fs-small:   0.95rem;
  --lh-small:   1.35rem;

  --fs-display: clamp(4rem, 11vw, 9.5rem);
  --lh-display: 0.92;
}

/* ── Reset ───────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border: 0 solid var(--rule);
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-tab-size: 4;
  tab-size: 4;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
  font-feature-settings: "kern" 1, "ss01" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;

  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Body copy is bold; semantic emphasis must read heavier than surroundings. */
strong,
b {
  font-weight: 900;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

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

a:hover {
  background: var(--fg);
  color: var(--bg);
  text-decoration: none;
}

h1, h2, h3, h4, h5, h6 {
  font-size: inherit;
  font-weight: inherit;
  line-height: inherit;
  letter-spacing: inherit;
}

ol, ul, dl {
  list-style: none;
}

abbr[title] {
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.85em;
  font-weight: 700;
  letter-spacing: 0;
}

kbd {
  display: inline-block;
  padding: 0 0.3em;
  border: 1px solid var(--rule);
  background: var(--bg);
  line-height: 1.4;
}

::selection {
  background: var(--fg);
  color: var(--bg);
}

/* ── Grid system ─────────────────────────────────────────── */

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  padding: var(--gutter);
}

.col-12 { grid-column: span 12; }

@media (min-width: 48rem) {
  .md-col-4 { grid-column: span 4;  }
  .md-col-8 { grid-column: span 8;  }
}

.cell {
  padding-top: var(--s-2);
  padding-bottom: var(--s-16);
}

/* Paired with `min-width: 48rem` above — one step below md for max-width queries */
@media (max-width: 47.999rem) {
  .cell {
    padding-bottom: var(--s-8);
  }
}

.pl {
  padding-left: 0;
}

@media (min-width: 48rem) {
  .pl {
    padding-left: var(--gutter);
  }
}

.border-t {
  border-top: 1px solid var(--rule);
}

@media (max-width: 47.999rem) {
  /* On mobile only the 4-col heading carries the rule; the 8-col body sits below it. */
  .grid .col-12.md-col-8.border-t {
    border-top: 0;
  }
}

/* ── Header / display type ───────────────────────────────── */

header.grid {
  padding-top: var(--s-8);
}

.display {
  font-size: var(--fs-display);
  line-height: var(--lh-display);
  letter-spacing: -0.02em;
}

.meta {
  font-size: var(--fs-small);
  line-height: var(--lh-small);
  letter-spacing: 0.01em;
}

header.grid .header-aside {
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
}

header.grid .header-kicker.meta {
  margin: 0;
  max-width: 30rem;
  text-align: start;
  font-size: clamp(1.36rem, 1.44rem + 0.16vw, 1.64rem);
}

/* ── Reader / chapter indicator ───────────────────────────── */

.reader {
  position: fixed;
  top: var(--gutter);
  right: var(--gutter);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 4px 8px;
  background: var(--bg);
  border: 1px solid var(--rule);
  font-size: 0.75rem;
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  pointer-events: none;
  font-variant-numeric: tabular-nums;
}

.reader-label {
  opacity: 0.6;
}

.reader-counter {
  font-size: 0.95rem;
}

@media (max-width: 36rem) {
  .reader { display: none; }
}

/* ── Table of contents ───────────────────────────────────── */

.toc-list li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  align-items: baseline;
  border-bottom: 1px solid var(--rule);
  padding: var(--s-2) 0;
}

.toc-list li:last-child {
  border-bottom: 0;
}

.toc-list a {
  display: contents;
  text-decoration: none;
}

.toc-list a:hover {
  background: transparent;
  color: inherit;
}

.toc-list a:hover .num,
.toc-list a:hover {
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.toc-list .num {
  font-variant-numeric: tabular-nums;
  opacity: 0.55;
}

/* ── Chapter sections ────────────────────────────────────── */

.chapter h2 {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  line-height: 1.05;
  letter-spacing: -0.005em;
}

.chapter h2 .ch-num {
  display: block;
  font-size: 0.9rem;
  line-height: 1;
  letter-spacing: 0.06em;
  margin-bottom: var(--s-4);
  opacity: 0.55;
  font-variant-numeric: tabular-nums;
}

.chapter h3 {
  font-size: 1.1rem;
  line-height: 1.4rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-top: var(--s-8);
  margin-bottom: var(--s-4);
}

.chapter p {
  margin-bottom: var(--s-4);
}

.chapter p + p {
  margin-top: var(--s-neg2);
}

.chapter ul.list,
.chapter ol.numbered {
  margin: var(--s-4) 0 var(--s-6);
}

.chapter ul.list li,
.chapter ol.numbered li {
  position: relative;
  padding: var(--s-2) 0;
  padding-left: 2.6rem;
  border-bottom: 1px solid var(--rule);
}

.chapter ul.list li:first-child,
.chapter ol.numbered li:first-child {
  border-top: 1px solid var(--rule);
}

.chapter ul.list li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: var(--s-2);
}

.chapter ol.numbered {
  counter-reset: step;
}

.chapter ol.numbered li {
  counter-increment: step;
}

.chapter ol.numbered li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: var(--s-2);
  font-variant-numeric: tabular-nums;
  opacity: 0.6;
  white-space: nowrap;
}

.chapter dl.kv {
  margin: var(--s-4) 0 var(--s-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--rule);
}

.chapter dl.kv dt,
.chapter dl.kv dd {
  border-bottom: 1px solid var(--rule);
  padding: var(--s-2) 0;
}

@media (min-width: 36rem) {
  .chapter dl.kv {
    grid-template-columns: 12rem 1fr;
    column-gap: var(--gutter);
  }
  .chapter dl.kv dt {
    padding-right: var(--gutter);
  }
}

.chapter ul.links {
  margin: var(--s-2) 0 var(--s-8);
  border-top: 1px solid var(--rule);
}

.chapter ul.links li {
  padding: var(--s-2) 0;
  border-bottom: 1px solid var(--rule);
}

/* Chapter body column: align copy and media to the inline start (right in LTR) */
.chapter > .md-col-8 {
  text-align: start;
}

.chapter > .md-col-8 .diagram,
.chapter > .md-col-8 figure.placeholder {
  margin-inline-start: auto;
  margin-inline-start: 0;
}

.chapter > .md-col-8 .nodes .node header {
  grid-template-columns: 1fr 2.5rem;
}

.chapter > .md-col-8 .nodes .node-num {
  grid-column: 2;
  grid-row: 1;
  justify-self: start;
}

.chapter > .md-col-8 .nodes .node h3 {
  grid-column: 1;
  grid-row: 1;
  text-align: start;
}

.chapter > .md-col-8 .nodes .node p {
  padding-left: 0;
  padding-right: 2.5rem;
  text-align: start;
}

.chapter > .md-col-8 .nodes .node-link {
  margin-left: 0;
  margin-right: 2.5rem;
  align-self: start;
  text-align: start;
}

.chapter > .md-col-8 .workflow {
  align-items: flex-start;
  text-align: start;
}

.chapter > .md-col-8 .workflow header,
.chapter > .md-col-8 .wf-meta,
.chapter > .md-col-8 .workflow p {
  text-align: start;
}

.chapter > .md-col-8 .domain .domain-tag {
  left: auto;
  right: 0;
  padding: 0 0 0 0.6em;
}

.chapter > .md-col-8 .domain .workflow .placeholder.has-media .ph-frame {
  margin-inline-start: auto;
  margin-inline-start: 0;
}

.small {
  font-size: var(--fs-small);
  line-height: var(--lh-small);
  opacity: 0.78;
}

/* ── Callout box ─────────────────────────────────────────── */

.callout {
  margin: var(--s-6) 0;
  padding: var(--s-4);
  border: 1px solid var(--rule);
  background: transparent;
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: var(--gutter);
}

.callout-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.6;
  align-self: start;
  padding-top: 0.25rem;
}

.callout p { margin: 0; }

/* ── Sockets / colour dots ───────────────────────────────── */

.dot {
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  border-radius: 50%;
  border: 1px solid var(--rule);
  vertical-align: middle;
  margin-right: 0.05em;
  transform: translateY(-0.05em);
}

.dot-pink { background: #f0a; }
.dot-yellow { background: #ee0; }
.dot-purple { background: rgb(154, 72, 247); }
.dot-blue   { background: #4af; }
.dot-orange { background: rgb(252, 135, 33); }

/* ── Diagrams ────────────────────────────────────────────── */

.diagram {
  margin: var(--s-6) 0 var(--s-8);
}

.diagram figcaption,
.placeholder figcaption {
  margin-top: var(--s-2);
  font-size: 0.85rem;
  line-height: 1.25rem;
  letter-spacing: 0.01em;
  opacity: 0.7;
}

/* SVG pipeline diagram */

.pipeline {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  background: transparent;
}

.pipeline .pipe rect {
  fill: var(--bg);
  stroke: var(--rule);
  stroke-width: 1.5;
}

.pipeline .pipe-text text {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.04em;
  fill: var(--fg);
}

.pipeline .pipe-sub text {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  fill: var(--fg);
  opacity: 0.55;
}

.pipeline .pipe-link line {
  stroke: var(--rule);
  stroke-width: 1.5;
  stroke-linecap: square;
}

/* ── Image / video placeholders ──────────────────────────── */

.placeholder {
  margin: var(--s-6) 0 var(--s-8);
}

.ph-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--rule);
  background-color: var(--frame);
  background-image:
    repeating-linear-gradient(
      45deg,
      transparent 0,
      transparent 18px,
      rgba(0, 0, 0, 0.06) 18px,
      rgba(0, 0, 0, 0.06) 19px
    );
  overflow: hidden;
}

.ph-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, var(--rule) 1px, transparent 1px) 0 0 / 25% 100%,
    linear-gradient(to bottom, var(--rule) 1px, transparent 1px) 0 0 / 100% 33.333%;
  opacity: 0.12;
}

.placeholder.has-media .ph-frame {
  aspect-ratio: auto;
  height: auto;
  background-image: none;
  background-color: var(--bg);
}

.placeholder.has-media .ph-frame::before {
  opacity: 0;
}

/* Width comes from the figure (100% of column or YAML `width`); height follows the file. */
.placeholder.has-media .ph-frame img,
.placeholder.has-media .ph-frame video {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  
}

/* ── Custom-node cards ───────────────────────────────────── */

.nodes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--rule);
  margin: var(--s-4) 0 var(--s-8);
}

@media (min-width: 36rem) {
  .nodes { grid-template-columns: 1fr 1fr; }
}

.node {
  border-bottom: 1px solid var(--rule);
  padding: var(--s-4) 0;
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

@media (min-width: 36rem) {
  .node {
    padding: var(--s-4);
    border-right: 1px solid var(--rule);
  }
  .node:nth-child(2n) {
    border-right: 0;
  }
}

.node header {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  align-items: baseline;
}

.node-num {
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  opacity: 0.55;
}

.node h3 {
  margin: 0;
  text-transform: none;
  font-size: 1.05rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.node p {
  font-size: 0.95rem;
  line-height: 1.3rem;
  margin: 0;
  padding-left: 2.5rem;
}

.node-link {
  margin-left: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0;
  word-break: break-all;
  text-decoration: underline;
  text-underline-offset: 0.2em;
  align-self: start;
}

/* ── Workflow / domain blocks ────────────────────────────── */

.domain {
  margin: var(--s-6) 0 var(--s-4);
  border-top: 1px solid var(--rule);
  padding-top: var(--s-4);
  position: relative;
}

.domain-tag {
  position: absolute;
  top: -0.7em;
  left: 0;
  background: var(--bg);
  padding: 0 0.6em 0 0;
  font-size: 0.85rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.domain-workflows {
  display: block;
}

/* Workflow grids (IMAGE / VIDEO / AUDIO): one layout for all domains */
.domain--node .domain-workflows {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0 var(--gutter);
  align-items: stretch;
}

@media (min-width: 48rem) {
  .domain--node .domain-workflows {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .domain--node .workflow {
    border-bottom: 0;
    align-self: stretch;
    height: 100%;
    min-height: 0;
  }

  .domain--node .workflow > header {
    min-height: clamp(4.25rem, 4.5vw + 2.5rem, 5.75rem);
    flex-shrink: 0;
    align-self: stretch;
    width: 100%;
  }
}

.workflow {
  padding: var(--s-4) 0 var(--s-6);
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  align-self: start;
  width: 100%;
  min-width: 0;
  text-align: start;
}

.workflow:last-child {
  border-bottom: 0;
}

/* Below md (48rem): stacked workflows; borders between rows */
@media (max-width: 47.999rem) {
  .domain--node .workflow {
    border-left: none;
    padding-left: 0;
    padding-right: 0;
    box-shadow: none;
  }
}

.workflow header {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.15rem;
  margin-bottom: var(--s-2);
  width: 100%;
  text-align: start;
}

@media (min-width: 36rem) {
  .workflow header {
    grid-template-columns: 1fr auto;
    align-items: baseline;
    column-gap: var(--gutter);
  }

  /* Narrow columns in 3-across grids: meta under title reads better */
  .domain--node .workflow header {
    grid-template-columns: 1fr;
  }
}

.workflow h3 {
  font-size: 1.4rem;
  line-height: 1.6rem;
  text-transform: none;
  letter-spacing: -0.005em;
  margin: 0;
}

@media (min-width: 48rem) {
  .domain--node .workflow h3 {
    font-size: 1.15rem;
    line-height: 1.15rem;
  }
}

.wf-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  opacity: 0.6;
  white-space: nowrap;
  text-align: start;
}

@media (min-width: 48rem) {
  .domain--node .wf-meta {
    white-space: normal;
  }
}

.workflow p {
  flex: 0 0 auto;
  margin-bottom: 0;
  margin-top: 0;
  width: 100%;
  text-align: start;
}

.workflow:has(.placeholder) > p {
  margin-top: var(--s-2);
}

@media (min-width: 48rem) {
  .domain--node .workflow p {
    font-size: 0.9rem;
    line-height: 1.35rem;
  }
}

/* Even title → screenshot → description spacing; equal screenshot slots across a row */
.domain .workflow {
  gap: var(--s-3);
}

.domain .workflow > header {
  margin-bottom: 0;
}

.domain .workflow > p {
  margin-top: 0;
}

.domain .workflow .placeholder {
  margin: 0;
  flex-shrink: 0;
}

.domain .workflow .placeholder.has-media {
  width: 100%;
  max-width: 100%;
  align-self: stretch;
}

.domain .workflow .placeholder:not(.has-media) {
  width: 100%;
  max-width: 100%;
  align-self: stretch;
}

.domain .workflow .placeholder.has-media .ph-frame {
  width: fit-content;
  max-width: 100%;
  margin-inline: auto;
  aspect-ratio: auto;
  height: auto;
  min-height: 0;
  position: relative;
}

.domain .workflow .placeholder.has-media .ph-frame img {
  position: relative;
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
}

/* ── Footer ──────────────────────────────────────────────── */

footer.grid {
  margin-top: var(--s-8);
}

footer.grid .cell {
  padding-bottom: var(--s-12);
}