/* =========================================
   ERP Design 3: Enterprise Flowchart
   Swiss Minimalist, High Contrast, Grid-based
========================================= */

@import url("https://fonts.googleapis.com/css2?family=Helvetica+Neue:wght@400;500;700&family=Lora:ital,wght@0,400;0,600;1,400&display=swap");

:root {
  --bg-paper: #f4f4f0; /* Warm off-white */
  --ink: #111111; /* Stark black */
  --ink-light: #555555;
  --accent-red: #d62828; /* Cadmium Red */
  --grid-line: rgba(17, 17, 17, 0.08);

  --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: "Lora", serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-paper);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.5;
  overflow-x: hidden;
  /* Very subtle grid background to mimic architectural paper */
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

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

/* === LAYOUT === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === HEADER === */
.swiss-header {
  border-bottom: 3px solid var(--ink);
  padding-bottom: 2rem;
  margin-bottom: 4rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.title-block h1 {
  font-family: var(--font-sans);
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.title-block .subtitle {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--ink-light);
  font-style: italic;
}

.meta-info {
  text-align: right;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.meta-info span {
  display: block;
}
.meta-info .red {
  color: var(--accent-red);
  font-weight: 700;
}

/* === HORIZONTAL FLOWCHART === */
.flowchart-wrapper {
  position: relative;
  margin-bottom: 4rem;
}

/* Central horizontal line connecting nodes */
.flow-line {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--ink);
  z-index: 0;
}

.flow-nodes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  position: relative;
  z-index: 10;
}

.flow-node {
  background-color: var(--bg-paper);
  border: 2px solid var(--ink);
  padding: 1.5rem;
  position: relative;
  transition: all 0.3s ease;
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.flow-node::before {
  content: "";
  position: absolute;
  top: -10px;
  left: -10px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--ink);
  border-left: 2px solid var(--ink);
  opacity: 0;
  transition: opacity 0.3s;
}

.flow-node::after {
  content: "";
  position: absolute;
  bottom: -10px;
  right: -10px;
  width: 10px;
  height: 10px;
  border-bottom: 2px solid var(--ink);
  border-right: 2px solid var(--ink);
  opacity: 0;
  transition: opacity 0.3s;
}

.flow-node.active {
  box-shadow: 8px 8px 0 var(--ink);
  transform: translate(-4px, -4px);
  border-color: var(--accent-red);
}

.flow-node.active::before,
.flow-node.active::after {
  opacity: 1;
  border-color: var(--accent-red);
}

.node-step {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--ink-light);
  margin-bottom: 1.5rem;
}

.flow-node.active .node-step {
  color: var(--accent-red);
}

.node-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.node-endpoint {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 700;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.node-endpoint .method {
  color: var(--bg-paper);
  background-color: var(--ink);
  padding: 0.1rem 0.4rem;
  font-size: 0.65rem;
  letter-spacing: 1px;
}

.flow-node.active .node-endpoint .method {
  background-color: var(--accent-red);
}

/* === DETAIL PANEL === */
.detail-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  border-top: 3px solid var(--ink);
  padding-top: 3rem;
  flex-grow: 1;
}

.detail-text h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 1.5rem;
  text-transform: uppercase;
}

.detail-text p {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--ink-light);
  margin-bottom: 1.2rem;
  line-height: 1.7;
}

.detail-text .participant {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: 1px solid var(--ink);
  padding: 0.2rem 0.5rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

/* Payload display */
.detail-payload {
  background-color: #fff;
  border: 1px solid var(--ink);
  padding: 2rem;
  position: relative;
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.05);
}

.payload-label {
  position: absolute;
  top: -10px;
  left: -1px;
  background-color: var(--ink);
  color: var(--bg-paper);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  padding: 0.4rem 0.8rem;
}

.payload-content {
  margin-top: 1rem;
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--ink);
  white-space: pre-wrap;
}

/* Data injection classes */
.hl-key {
  font-weight: 700;
  color: var(--ink);
}
.hl-string {
  color: var(--accent-red);
}
.hl-comment {
  color: var(--ink-light);
  font-style: italic;
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .flow-nodes {
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
  }
  .flow-line {
    display: none;
  }
  .swiss-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .meta-info {
    text-align: left;
  }
}

@media (max-width: 768px) {
  .flow-nodes {
    grid-template-columns: 1fr;
  }
  .detail-panel {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .title-block h1 {
    font-size: 2.2rem;
  }
}