:root {
  --page-bg: #ffffff;
  --panel-bg: #f7f8f7;
  --text: #17201d;
  --muted: #5e6965;
  --border: #dce2df;
  --accent: #2e6f5e;
  --accent-dark: #205347;
  --accent-soft: #e7f1ed;
  --lca: #40798c;
  --dt: #6d5f9a;
  --ce: #4f8a65;
  --focus: #e9a23b;
  --shadow: 0 18px 45px rgba(23, 32, 29, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

button,
a {
  font: inherit;
}

.venn-app {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 54px;
}

.app-header {
  max-width: 760px;
  margin-bottom: 26px;
}

.eyebrow,
.details-kicker {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(2rem, 4vw, 3.35rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.intro {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.app-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.85fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

.diagram-panel {
  min-width: 0;
}

.diagram-wrap {
  position: relative;
  width: 100%;
}

#venn {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
  touch-action: manipulation;
}

.set {
  stroke-width: 3;
  transition: opacity 160ms ease, stroke-width 160ms ease;
}

.set-lca {
  fill: color-mix(in srgb, var(--lca) 22%, transparent);
  stroke: var(--lca);
}

.set-dt {
  fill: color-mix(in srgb, var(--dt) 21%, transparent);
  stroke: var(--dt);
}

.set-ce {
  fill: color-mix(in srgb, var(--ce) 21%, transparent);
  stroke: var(--ce);
}

.set-circles.is-dimmed .set {
  opacity: 0.28;
}

.set-circles .set.is-related {
  opacity: 0.8;
  stroke-width: 4;
}

.set-labels text {
  fill: var(--text);
  font-size: 22px;
  font-weight: 720;
  letter-spacing: -0.01em;
  pointer-events: none;
}

.region-highlight {
  pointer-events: none;
}

.region-shape {
  display: none;
  fill: color-mix(in srgb, var(--accent) 58%, transparent);
  stroke: var(--accent);
  stroke-width: 3;
  filter: url(#region-glow);
}

.region-shape.is-active {
  display: block;
}

.project-node {
  cursor: pointer;
  outline: none;
}

.project-node .project-halo {
  fill: transparent;
  stroke: transparent;
  stroke-width: 10;
}

.project-node .project-dot {
  fill: #ffffff;
  stroke: var(--text);
  stroke-width: 3;
  transition: transform 150ms ease, fill 150ms ease, opacity 150ms ease;
  transform-box: fill-box;
  transform-origin: center;
}

.project-node .project-label-bg {
  fill: rgba(255, 255, 255, 0.92);
  stroke: var(--border);
  stroke-width: 1;
}

.project-node .project-label {
  fill: var(--text);
  font-size: 14px;
  font-weight: 720;
  pointer-events: none;
}

.project-node:hover .project-dot,
.project-node:focus .project-dot,
.project-node.is-selected .project-dot,
.project-node.is-related .project-dot {
  fill: var(--accent);
  stroke: var(--accent-dark);
  transform: scale(1.28);
  filter: url(#point-glow);
}

.project-node.is-selected .project-label-bg {
  stroke: var(--accent);
  stroke-width: 2;
}

.project-node.is-dimmed {
  opacity: 0.24;
}

#region-hit-area {
  cursor: crosshair;
  pointer-events: all;
}

.tooltip {
  position: absolute;
  z-index: 10;
  width: min(280px, calc(100% - 24px));
  padding: 11px 13px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 0.9rem;
  pointer-events: none;
}

.tooltip strong {
  display: block;
  margin-bottom: 3px;
}

.tooltip span {
  color: var(--muted);
}

.region-status {
  min-height: 1.6em;
  margin: 4px 0 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.92rem;
}

.details-panel {
  position: sticky;
  top: 26px;
  min-height: 340px;
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel-bg);
}

.details-empty p:last-child,
.project-description {
  color: var(--muted);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 20px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  font-size: 0.82rem;
  font-weight: 670;
}

.project-description {
  margin-bottom: 24px;
}

.project-links {
  display: grid;
  gap: 10px;
}

.project-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 13px;
  border: 1px solid var(--accent);
  border-radius: 9px;
  color: var(--accent-dark);
  font-weight: 700;
  text-decoration: none;
  transition: background 150ms ease, color 150ms ease, transform 150ms ease;
}

.project-link::after {
  content: "↗";
}

.project-link:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}

.project-link:focus-visible,
.project-node:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.no-link-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.noscript {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-bg);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (max-width: 840px) {
  .venn-app {
    width: min(100% - 24px, 760px);
    padding-top: 28px;
  }

  .app-layout {
    grid-template-columns: 1fr;
  }

  .details-panel {
    position: static;
    min-height: 0;
  }
}

@media (max-width: 520px) {
  .set-labels text {
    font-size: 18px;
  }

  .project-node .project-label {
    font-size: 13px;
  }

  .project-node .project-label-bg {
    opacity: 0.95;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}