.c4it-vending-basic {
  --ink: #1f2937;
  --muted: #667085;
  --line: #cbd5e1;
  --blue: #2563eb;
  --green: #138a5b;
  --bg: #f6f8fb;
  color: var(--ink);
  margin: 28px 0;
}
.c4it-vending-basic * { box-sizing: border-box; }
.c4it-vending-basic__intro,
.c4it-vending-basic__message {
  background: var(--bg);
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  padding: 16px;
}
.c4it-vending-basic__intro h3 {
  font-size: 1.2rem;
  line-height: 1.45;
  margin: 0 0 8px;
}
.c4it-vending-basic__intro p,
.c4it-vending-basic__message p {
  line-height: 1.75;
  margin: 0;
}
.c4it-vending-basic__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.c4it-vending-basic__actions button {
  appearance: none;
  background: #fff;
  border: 1px solid #b7c3d6;
  border-radius: 6px;
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  min-height: 42px;
  padding: 0 14px;
}
.c4it-vending-basic__actions button[data-action="step"],
.c4it-vending-basic__actions button[data-action="run"] {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.c4it-vending-basic__stage {
  align-items: start;
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(250px, .85fr) minmax(300px, 1.15fr);
  margin-top: 16px;
}
.c4it-vending-basic__machine,
.c4it-vending-basic__chart {
  background: #fff;
  border: 1px solid #dbe3ef;
  border-radius: 8px;
  padding: 14px;
}
.c4it-vending-basic__machine-shell {
  background: linear-gradient(180deg, #e8edf5, #d7e0ed);
  border: 2px solid #93a4bc;
  border-radius: 16px 16px 10px 10px;
  box-shadow: inset 0 0 0 4px rgba(255,255,255,.42);
  margin: 0 auto;
  max-width: 280px;
  min-height: 390px;
  overflow: hidden;
  padding: 14px;
  position: relative;
}
.c4it-vending-basic__machine-head {
  align-items: center;
  background: #18243a;
  border-radius: 8px;
  color: #fff;
  display: flex;
  justify-content: space-between;
  min-height: 42px;
  padding: 8px 10px;
}
.c4it-vending-basic__machine-head span {
  font-size: .8rem;
  font-weight: 800;
}
.c4it-vending-basic__machine-head strong {
  background: #0b1220;
  border-radius: 4px;
  color: #79f2b5;
  min-width: 72px;
  padding: 4px 8px;
  text-align: right;
}
.c4it-vending-basic__drink {
  appearance: none;
  background: #f8fafc;
  border: 2px solid #b9c6d8;
  border-radius: 8px;
  color: var(--ink);
  display: block;
  margin: 14px auto 0;
  min-height: 132px;
  padding: 10px;
  width: 132px;
}
.c4it-vending-basic__drink span {
  background: linear-gradient(180deg, #38bdf8, #2563eb);
  border-radius: 16px 16px 8px 8px;
  display: block;
  height: 76px;
  margin: 0 auto 8px;
  width: 42px;
}
.c4it-vending-basic__drink.is-selected {
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(37,99,235,.16);
}
.c4it-vending-basic__panel {
  align-items: center;
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 16px;
}
.c4it-vending-basic__coin-slot,
.c4it-vending-basic__return {
  align-items: center;
  background: #f8fafc;
  border: 2px solid #94a3b8;
  border-radius: 8px;
  display: flex;
  height: 62px;
  justify-content: center;
  position: relative;
}
.c4it-vending-basic__coin-slot { width: 96px; }
.c4it-vending-basic__return { width: 74px; }
.c4it-vending-basic__coin-slot::before {
  background: #111827;
  border-radius: 999px;
  content: "";
  height: 6px;
  left: 18px;
  position: absolute;
  right: 18px;
  top: 10px;
}
.c4it-vending-basic__coin {
  align-items: center;
  background: #facc15;
  border: 2px solid #a16207;
  border-radius: 50%;
  color: #713f12;
  display: flex;
  font-size: .78rem;
  font-weight: 800;
  height: 38px;
  justify-content: center;
  opacity: 0;
  transform: translateY(-22px);
  transition: opacity .25s ease, transform .3s ease;
  width: 38px;
}
.c4it-vending-basic__coin.is-active {
  opacity: 1;
  transform: translateY(8px);
}
.c4it-vending-basic__return::before {
  background: #334155;
  border-radius: 999px;
  content: "";
  height: 18px;
  left: 50%;
  position: absolute;
  top: 8px;
  transform: translateX(-50%);
  transition: transform .2s ease, background .2s ease;
  width: 42px;
}
.c4it-vending-basic__return span {
  color: #334155;
  font-size: .78rem;
  font-weight: 800;
  line-height: 1;
  margin-top: 24px;
}
.c4it-vending-basic__return.is-active {
  border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(19,138,91,.14);
}
.c4it-vending-basic__return.is-active::before {
  background: var(--green);
  transform: translate(-50%, 6px);
}
.c4it-vending-basic__tray {
  align-items: center;
  background: #111827;
  border-radius: 8px;
  display: flex;
  height: 68px;
  justify-content: center;
  margin-top: 18px;
  overflow: hidden;
}
.c4it-vending-basic__tray span {
  background: linear-gradient(180deg, #38bdf8, #2563eb);
  border-radius: 12px 12px 6px 6px;
  display: block;
  height: 46px;
  opacity: 0;
  transform: translateY(-36px);
  transition: opacity .25s ease, transform .3s ease;
  width: 32px;
}
.c4it-vending-basic__tray span.is-active {
  opacity: 1;
  transform: translateY(0);
}
.c4it-vending-basic__change {
  bottom: 12px;
  display: flex;
  gap: 4px;
  left: 16px;
  min-height: 24px;
  position: absolute;
}
.c4it-vending-basic__change span {
  background: #e5e7eb;
  border: 1px solid #64748b;
  border-radius: 50%;
  display: block;
  height: 22px;
  width: 22px;
}
.c4it-vending-basic__stats {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr 1fr;
  margin-top: 12px;
}
.c4it-vending-basic__stats div {
  background: var(--bg);
  border: 1px solid #dbe3ef;
  border-radius: 6px;
  padding: 10px;
}
.c4it-vending-basic__stats span {
  color: var(--muted);
  display: block;
  font-size: .82rem;
}
.c4it-vending-basic__stats strong {
  display: block;
  font-size: 1.08rem;
  margin-top: 2px;
}
.c4it-vending-basic__chart svg {
  display: block;
  height: auto;
  max-height: 660px;
  width: 100%;
}
.c4it-vending-basic__line {
  fill: none;
  marker-end: url(#c4it-vending-basic-arrow);
  stroke: var(--line);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 3;
}
.c4it-vending-basic__line--return { stroke-dasharray: 8 7; }
.c4it-vending-basic__node rect,
.c4it-vending-basic__node polygon {
  fill: #fff;
  stroke: #94a3b8;
  stroke-width: 3;
}
.c4it-vending-basic__node text,
.c4it-vending-basic__label {
  fill: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-anchor: middle;
}
.c4it-vending-basic__label {
  fill: var(--muted);
  font-size: 13px;
}
.c4it-vending-basic__node.is-active rect,
.c4it-vending-basic__node.is-active polygon {
  fill: #eff6ff;
  stroke: var(--blue);
}
.c4it-vending-basic__node.is-done rect,
.c4it-vending-basic__node.is-done polygon {
  fill: #ecfdf3;
  stroke: var(--green);
}
.c4it-vending-basic__message { margin-top: 16px; }
.c4it-vending-basic__message strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.c4it-vending-basic__message ol {
  display: grid;
  gap: 6px;
  line-height: 1.6;
  margin: 12px 0 0;
  padding-left: 1.35em;
}
@media (max-width: 720px) {
  .c4it-vending-basic { margin: 22px 0; }
  .c4it-vending-basic__intro,
  .c4it-vending-basic__message,
  .c4it-vending-basic__machine,
  .c4it-vending-basic__chart { padding: 12px; }
  .c4it-vending-basic__actions {
    display: grid;
    grid-template-columns: 1fr;
  }
  .c4it-vending-basic__stage {
    gap: 12px;
    grid-template-columns: 1fr;
  }
  .c4it-vending-basic__chart svg { max-height: none; }
}