/* =========================================================
   n8n Workflows for Marketing — shared design system
   Based on the IE Business School palette, aligned with
   the RC Celta case-study manual so students recognise it.
========================================================= */
:root {
  --bg:           #FFFFFF;
  --bg-soft:      #F5F5F5;
  --bg-elev:      #FAFAFA;

  --ink:          #0A0A0A;
  --ink-2:        #1F1F1F;
  --ink-3:        #444444;
  --ink-4:        #737373;
  --ink-5:        #A3A3A3;

  --ie-blue:      #0030A8;
  --ie-blue-2:    #0044D1;
  --ie-blue-dark: #001F6E;
  --ie-blue-soft: #E6EBF5;
  --ie-red:       #E4002B;

  --line:         #E5E5E5;
  --line-hi:      #D4D4D4;
  --success:      #15803D;
  --warning:      #B45309;
  --error:        #DC2626;

  --radius:       6px;
  --radius-sm:    4px;
  --trans:        .2s cubic-bezier(.4, 0, .2, 1);

  --font-sans:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif:   "Instrument Serif", Georgia, "Times New Roman", serif;
  --font-mono:    "SF Mono", Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink-2);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "kern" 1, "liga" 1, "ss01" 1;
}
::selection { background: var(--ie-blue); color: #fff; }
a { color: var(--ie-blue); text-decoration: underline; text-underline-offset: 3px; transition: color var(--trans); }
a:hover { color: var(--ie-blue-2); }
code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: var(--bg-soft);
  padding: .1em .35em;
  border-radius: 3px;
  color: var(--ink);
}

/* ========== Layout ========== */
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 1.5rem; }

/* ========== Hero ========== */
.hero {
  padding: 4rem 1.5rem 3rem;
  max-width: 1040px;
  margin: 0 auto;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 2.5rem;
}
.hero__eyebrow-logo { height: 36px; width: auto; display: block; }
.hero__eyebrow-divider { width: 1px; height: 22px; background: var(--line); }
.hero__title {
  font-size: clamp(2.25rem, 5.5vw, 4.5rem);
  font-weight: 900;
  color: var(--ink);
  line-height: 1.05;
  letter-spacing: -.035em;
  text-transform: uppercase;
  margin-bottom: 1.75rem;
}
.hero__title .accent {
  color: var(--ie-blue);
  font-style: italic;
  font-family: var(--font-serif);
  font-weight: 400;
  text-transform: none;
  letter-spacing: -.01em;
}
.hero__lead {
  font-size: 1.15rem;
  color: var(--ink-3);
  max-width: 680px;
  line-height: 1.55;
}

/* ========== Section ========== */
.section {
  padding: 3rem 1.5rem;
  max-width: 1040px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}
.sec-header {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  align-items: start;
}
.sec-num {
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--ie-blue);
  font-weight: 700;
  letter-spacing: .12em;
  padding-top: .4rem;
}
.sec-eyebrow {
  display: block;
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-weight: 700;
  margin-bottom: .65rem;
}
.sec-title {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 900;
  color: var(--ink);
  line-height: 1.1;
  letter-spacing: -.025em;
  margin-bottom: .85rem;
  text-transform: none;
}
.sec-lead { color: var(--ink-3); font-size: 1.02rem; max-width: 720px; }
.h-sub {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
  margin: 2.5rem 0 1rem;
  letter-spacing: -.005em;
}

/* ========== Grids ========== */
.grid { display: grid; gap: 1rem; margin: 1rem 0 2rem; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ========== Cards ========== */
.card {
  background: var(--ie-blue-dark);
  color: #fff;
  padding: 1.5rem 1.6rem;
  border-radius: var(--radius);
  transition: all var(--trans);
}
.card:hover { background: var(--ie-blue); transform: translateY(-2px); }
.card__icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,.12);
  border-radius: 4px;
  font-size: 1.3rem;
  margin-bottom: 1.25rem;
}
.card__icon--logo { background: #fff; padding: 6px; }
.card__icon--logo img { display: block; width: 100%; height: 100%; object-fit: contain; }
.card__role {
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: rgba(255,255,255,.7);
  text-transform: uppercase;
  margin-bottom: .7rem;
}
.card__title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: .7rem;
  letter-spacing: -.01em;
  line-height: 1.2;
}
.card__text {
  font-size: .92rem;
  color: rgba(255,255,255,.85);
  line-height: 1.55;
}
.card a { color: #fff; font-weight: 600; }
.card code { background: rgba(255,255,255,.15); color: #fff; }
.card--light {
  background: var(--bg);
  color: var(--ink-2);
  border: 1px solid var(--line);
}
.card--light:hover { background: var(--bg); border-color: var(--ink); }
.card--light .card__icon { background: var(--bg-soft); }
.card--light .card__role  { color: var(--ie-blue); }
.card--light .card__title { color: var(--ink); }
.card--light .card__text  { color: var(--ink-3); }
.card--light a {
  color: var(--ie-blue);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.card--light a:hover { color: var(--ie-blue-2); }
.card--light code { background: var(--bg-soft); color: var(--ink); }

/* ========== Flow steps ========== */
.flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2.5rem;
}
.flow__step {
  background: var(--bg-soft);
  padding: 1.25rem 1.3rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: all var(--trans);
}
.flow__step:hover { border-color: var(--ie-blue); }
.flow__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--ie-blue);
  font-weight: 700;
  letter-spacing: .12em;
  display: block;
  margin-bottom: .75rem;
}
.flow__step h5 {
  font-size: .92rem;
  font-weight: 800;
  color: var(--ink);
  margin-bottom: .5rem;
  line-height: 1.3;
  letter-spacing: -.005em;
}
.flow__step p {
  font-size: .85rem;
  color: var(--ink-3);
  line-height: 1.5;
  margin: 0;
}

/* ========== Callouts ========== */
.callout {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 1.1rem;
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--ie-blue);
  border-radius: var(--radius);
  background: var(--bg-soft);
  margin: 1.5rem 0;
}
.callout--tip  { border-left-color: var(--ie-blue); }
.callout--good { border-left-color: var(--success); }
.callout--warn { border-left-color: var(--warning); }
.callout--class{ border-left-color: var(--ie-red); }
.callout__icon { font-size: 1.5rem; line-height: 1; padding-top: .2rem; }
.callout__body h4 {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--ink);
  margin-bottom: .4rem;
}
.callout__body p { color: var(--ink-3); font-size: .92rem; line-height: 1.55; }

/* ========== Prompt blocks ========== */
.prompt {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 1.25rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0 1.5rem;
}
.prompt__badge {
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--ie-blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  border-radius: 50%;
}
.prompt__body { min-width: 0; }
.prompt__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .85rem;
  margin-bottom: .85rem;
}
.prompt__title {
  font-size: .98rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.005em;
}
.prompt__artefact {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ie-blue);
  font-weight: 600;
}
.prompt__quote {
  border-left: 2px solid var(--ie-blue);
  padding: .7rem 0 .7rem 1rem;
  color: var(--ink-2);
  font-size: .95rem;
  line-height: 1.6;
  margin-bottom: .85rem;
  font-style: italic;
}
.prompt__quote em { font-style: normal; color: var(--ink-4); }
.prompt__result { font-size: .88rem; color: var(--ink-3); margin-top: .4rem; line-height: 1.55; }
.prompt__preview {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: .9rem;
  padding: .35rem .8rem;
  background: var(--bg);
  border: 1px solid var(--ie-blue);
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  color: var(--ie-blue);
  text-decoration: none;
  transition: all var(--trans);
}
.prompt__preview:hover { background: var(--ie-blue); color: #fff; }

/* ========== Node anatomy rows ========== */
.node-detail { display: grid; gap: 1rem; margin: 1.25rem 0 2rem; }
.node-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 1.1rem;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius);
  transition: all var(--trans);
}
.node-row:hover { border-color: var(--ie-blue); }
.node-row__rail { display: flex; flex-direction: column; align-items: flex-start; gap: .35rem; }
.node-row__num {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--ie-blue);
  font-weight: 700;
  letter-spacing: .1em;
}
.node-row__emoji { font-size: 1.6rem; line-height: 1; }
.node-row__body { min-width: 0; }
.node-row__title {
  font-size: .92rem;
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin: 0 0 .1rem;
}
.node-row__kind {
  font-family: var(--font-mono);
  font-size: .66rem;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: .55rem;
}
.node-row__text { color: var(--ink-3); font-size: .88rem; line-height: 1.55; margin: 0 0 .7rem; }
.node-row__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .45rem .9rem;
  border-top: 1px dashed var(--line);
  padding-top: .65rem;
}
.node-row__meta-item { font-size: .78rem; color: var(--ink-3); line-height: 1.5; }
.node-row__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .64rem;
  color: var(--ie-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  margin-right: .4rem;
}
.node-row__label--warn { color: var(--ie-red); }

/* ========== Workflow canvas screenshot ========== */
.workflow-shot {
  max-width: 720px;
  margin: 1.5rem auto 2rem;
  background: #f3f5f8;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .75rem;
}
.workflow-shot img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}
.workflow-shot__caption {
  margin-top: .75rem;
  color: var(--ink-4);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  text-align: center;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .85rem 1.25rem;
  font-family: var(--font-sans);
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all var(--trans);
  cursor: pointer;
}
.btn--primary {
  background: var(--ie-blue);
  color: #fff;
  border: 1px solid var(--ie-blue);
}
.btn--primary:hover { background: var(--ie-blue-dark); color: #fff; }
.btn--ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line-hi);
}
.btn--ghost:hover { border-color: var(--ink); }

/* ========== Back link ========== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-4);
  text-decoration: none;
  margin-bottom: 2rem;
}
.back-link:hover { color: var(--ie-blue); }

/* ========== Footer ========== */
.footer {
  margin-top: 4rem;
  padding: 2.5rem 1.5rem 3rem;
  background: var(--ie-blue-dark);
  color: rgba(255,255,255,.75);
  font-size: .82rem;
}
.footer .wrap { display: flex; flex-wrap: wrap; gap: 2rem; align-items: flex-start; justify-content: space-between; }
.footer a { color: #fff; }
.footer__brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: #fff;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  font-size: .78rem;
}
.footer__brand img { height: 28px; width: auto; filter: brightness(0) invert(1); }

/* ========== Responsive ========== */
@media (max-width: 640px) {
  .hero { padding: 3rem 1.25rem 2rem; }
  .section { padding: 2.5rem 1.25rem; }
  .sec-header { grid-template-columns: 1fr; gap: .5rem; }
  .prompt { grid-template-columns: 1fr; }
  .node-row { grid-template-columns: 1fr; }
  .node-row__rail { flex-direction: row; align-items: center; gap: .75rem; }
}