:root {
  color-scheme: dark;
  --bg: #09090c;
  --surface: #14151b;
  --surface-strong: #1a1c24;
  --border: #2b2f3a;
  --border-strong: #3a4050;
  --text: #f8f8fb;
  --muted: #a7adba;
  --muted-2: #6e7585;
  --brand: #ec101a;
  --brand-soft: rgba(236, 16, 26, 0.14);
  --blue: #60a5fa;
  --teal: #2dd4bf;
  --amber: #f59e0b;
  --green: #22c55e;
  --pink: #fb7185;
  --canvas-bg: #f2f4f8;
  --canvas-grid: rgba(122, 154, 206, 0.18);
  --shadow-sm: 0 12px 24px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 20px 50px rgba(0, 0, 0, 0.28);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(236, 16, 26, 0.12), transparent 18%),
    linear-gradient(180deg, #08090d 0%, #09090c 100%);
  color: var(--text);
  font-family: "IBM Plex Sans", sans-serif;
}

body {
  padding: 14px;
}

button,
a {
  font: inherit;
}

.visual-header,
.visual-toolbar,
.builder-shell {
  background: rgba(20, 21, 27, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 22px;
  box-shadow: var(--shadow-sm);
}

.visual-header {
  padding: 18px 18px 8px;
}

.visual-header__main {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}

.visual-kicker {
  margin: 0 0 8px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #aab3c5;
  font-family: "IBM Plex Mono", monospace;
}

.visual-header h1,
.visual-toolbar h2,
.builder-shell__header h3 {
  margin: 0;
  font-family: "Bebas Neue", sans-serif;
  letter-spacing: 0.02em;
  line-height: 0.95;
}

.visual-header h1 {
  font-size: clamp(2.8rem, 5vw, 4.4rem);
}

.visual-subtitle,
.builder-caption {
  margin: 12px 0 0;
  max-width: 720px;
  color: var(--muted);
}

.back-link,
.filter-chip,
.zoom-btn,
.fit-btn {
  border: 1px solid transparent;
  border-radius: 999px;
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: 180ms ease;
}

.back-link {
  padding: 0 18px;
  background: linear-gradient(180deg, #ff2431, #d90f19);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 12px 30px rgba(236, 16, 26, 0.28);
}

.back-link:hover,
.filter-chip:hover,
.zoom-btn:hover,
.fit-btn:hover {
  transform: translateY(-1px);
}

.visual-stats {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat-pill {
  min-height: 70px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
}

.stat-pill strong {
  display: block;
  font-size: 1.8rem;
  line-height: 1;
}

.stat-pill span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.84rem;
}

.visual-main {
  margin-top: 14px;
  display: grid;
  gap: 14px;
}

.visual-toolbar {
  padding: 14px 16px;
}

.toolbar-actions {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.filter-group,
.zoom-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.filter-chip {
  padding: 0 16px;
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text);
  cursor: pointer;
}

.filter-chip.is-active {
  background: linear-gradient(180deg, #ff2431, #d90f19);
  border-color: #ff4b55;
  box-shadow: 0 10px 24px rgba(236, 16, 26, 0.26);
}

.zoom-badge,
.zoom-level {
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
}

.zoom-btn,
.fit-btn {
  min-width: 36px;
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text);
  cursor: pointer;
}

.fit-btn {
  background: linear-gradient(180deg, #ff2431, #d90f19);
  border-color: transparent;
  font-weight: 700;
}

.builder-shell {
  overflow: hidden;
}

.builder-shell__header {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(180deg, rgba(236, 16, 26, 0.1), rgba(255, 255, 255, 0.02));
}

.builder-shell__header h3 {
  font-size: 2rem;
}

.builder-viewport {
  overflow: auto;
  background: #101218;
  padding: 0;
  min-height: 760px;
  max-height: calc(100dvh - 280px);
}

.builder-stage-shell {
  position: relative;
  margin: 0 auto;
}

.builder-stage {
  position: relative;
  width: 4400px;
  height: 3000px;
  transform-origin: top left;
  background:
    linear-gradient(90deg, var(--canvas-grid) 1px, transparent 1px),
    linear-gradient(var(--canvas-grid) 1px, transparent 1px),
    var(--canvas-bg);
  background-size: 32px 32px;
}

.builder-lines,
.builder-nodes {
  position: absolute;
  inset: 0;
}

.builder-stage.is-dragging,
.builder-stage.is-dragging * {
  user-select: none;
}

.builder-lines {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.builder-lines path {
  fill: none;
  stroke-width: 6;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 3px 8px rgba(0, 0, 0, 0.12));
}

.builder-lines .edge--core {
  stroke: var(--brand);
}

.builder-lines .edge--support {
  stroke: #4f7cff;
}

.builder-lines .edge--portal {
  stroke: var(--amber);
  stroke-dasharray: 18 10;
}

.builder-lines .edge--commercial {
  stroke: var(--green);
}

.builder-lines .edge--handoff {
  stroke: #525a6f;
  stroke-dasharray: 12 10;
}

.builder-lines .edge--timeout {
  stroke: var(--pink);
  stroke-dasharray: 10 10;
}

.builder-lines .is-dimmed {
  opacity: 0.14;
}

.lane-label {
  position: absolute;
  left: 48px;
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(10, 13, 18, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #eef2fb;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lane-label--top {
  top: 40px;
}

.lane-label--bottom {
  top: 2150px;
}

.flow-node {
  position: absolute;
  display: grid;
  grid-template-rows: auto auto auto auto;
  align-content: start;
  gap: 12px;
  padding: 18px;
  border-radius: 28px;
  border: 2px solid rgba(46, 111, 255, 0.18);
  background: rgba(255, 255, 255, 0.92);
  color: #182033;
  box-shadow: 0 24px 34px rgba(22, 30, 53, 0.12);
  cursor: grab;
  touch-action: none;
}

.flow-node::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 22px;
  border: 2px solid rgba(23, 201, 150, 0.45);
  pointer-events: none;
}

.flow-node.is-dragging {
  cursor: grabbing;
  box-shadow: 0 24px 50px rgba(17, 25, 47, 0.22);
  z-index: 12;
}

.flow-node.is-entry {
  background: linear-gradient(180deg, #f2fff7, #ffffff 72%);
}

.flow-node.is-menu {
  background: linear-gradient(180deg, #f6fbff, #ffffff 75%);
}

.flow-node.is-decision {
  border-style: dashed;
  background: linear-gradient(180deg, #fff8ec, #ffffff 74%);
}

.flow-node.is-handoff {
  background: linear-gradient(180deg, #fff4f5, #ffffff 72%);
}

.flow-node.is-terminal {
  background: linear-gradient(180deg, #f8fafc, #ffffff 72%);
}

.flow-node.is-timeout {
  background: linear-gradient(180deg, #fff1f3, #ffffff 72%);
}

.flow-node.is-dimmed {
  opacity: 0.2;
}

.node-eyebrow {
  display: inline-flex;
  align-self: start;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: "IBM Plex Mono", monospace;
  background: rgba(26, 34, 52, 0.08);
  color: #5a6885;
}

.node-title {
  margin: 0;
  font-family: "Bebas Neue", sans-serif;
  font-size: 2rem;
  letter-spacing: 0.02em;
  line-height: 0.95;
}

.node-copy {
  display: grid;
  gap: 8px;
}

.node-copy p,
.node-copy li {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.45;
  color: #43506a;
}

.node-copy ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

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

.node-chip {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(26, 34, 52, 0.08);
  border: 1px solid rgba(26, 34, 52, 0.08);
  color: #43506a;
  font-size: 0.72rem;
  font-family: "IBM Plex Mono", monospace;
}

.node-chip.is-primary {
  background: rgba(236, 16, 26, 0.08);
  color: #b71d28;
  border-color: rgba(236, 16, 26, 0.12);
}

.node-chip.is-success {
  background: rgba(34, 197, 94, 0.12);
  color: #227647;
  border-color: rgba(34, 197, 94, 0.16);
}

.node-chip.is-warn {
  background: rgba(245, 158, 11, 0.12);
  color: #8b5b07;
  border-color: rgba(245, 158, 11, 0.18);
}

.node-chip.is-info {
  background: rgba(79, 124, 255, 0.1);
  color: #3657b7;
  border-color: rgba(79, 124, 255, 0.14);
}

@media (max-width: 1120px) {
  .visual-header__main,
  .toolbar-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .visual-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  body {
    padding: 10px;
  }

  .visual-stats {
    grid-template-columns: 1fr;
  }

  .builder-viewport {
    min-height: 520px;
    max-height: calc(100dvh - 360px);
  }
}