:root {
  --bg: #0a0d11;
  --panel: #10151b;
  --txt: #dce4ea;
  --mut: #7d8b97;
  --line: #202a33;
  --accent: #5eead4;
  --accent-dim: #1f7566;
  --cat-biz: #5eead4;
  --cat-hosp: #4ade80;
  --cat-tools: #ff9f5a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--txt);
  font-family: "Inter", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  overflow: hidden;
}

nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 28px;
  z-index: 20;
  pointer-events: none;
}
nav * { pointer-events: auto; }

.brand {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--txt);
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.brand span { color: var(--accent); }

.navlinks { display: flex; gap: 18px; align-items: center; }
.navlinks a {
  color: var(--mut);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color .15s;
}
.navlinks a:hover { color: var(--txt); }

.legend {
  position: fixed;
  top: 24px;
  right: 28px;
  z-index: 15;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mut);
  text-align: right;
  line-height: 2.1;
}
.legend .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 8px; }

.hero {
  position: fixed;
  left: 28px;
  bottom: 34px;
  z-index: 15;
  max-width: 480px;
  pointer-events: none;
}
.hero h1 {
  font-size: 34px;
  line-height: 1.15;
  margin: 0 0 10px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p {
  margin: 0;
  color: var(--mut);
  font-size: 13.5px;
  line-height: 1.6;
}

svg#graph { position: fixed; inset: 0; width: 100%; height: 100%; cursor: grab; }
svg#graph:active { cursor: grabbing; }

.link { stroke: var(--line); stroke-width: 1; transition: stroke-opacity .2s; }
.node { cursor: pointer; }
.node .disc { transition: filter .2s, r .2s; }
.node.dim { opacity: 0.15; }
.node text {
  fill: var(--txt);
  font-size: 10.5px;
  letter-spacing: 0.01em;
  text-anchor: middle;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 3px;
  stroke-linejoin: round;
  pointer-events: none;
}
.node.cat text {
  fill: var(--mut);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.node.hub text { font-size: 13px; font-weight: 700; letter-spacing: 0.04em; }

/* detail panel */
.panel-overlay {
  position: fixed; inset: 0;
  background: rgba(6, 8, 10, 0.72);
  backdrop-filter: blur(2px);
  z-index: 30;
  display: none;
  overflow-y: auto;
}
.panel-overlay.open { display: block; }

.panel {
  max-width: 760px;
  margin: 64px auto 64px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 40px 44px 44px;
  position: relative;
}
.panel .close {
  position: absolute; top: 18px; right: 20px;
  color: var(--mut); font-size: 22px; cursor: pointer;
  background: none; border: none; line-height: 1;
}
.panel .close:hover { color: var(--txt); }

.badge {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid currentColor;
  margin-bottom: 16px;
}
.panel h2 { font-size: 30px; margin: 0 0 6px; font-weight: 800; }
.panel .meta { color: var(--mut); font-size: 12.5px; margin-bottom: 18px; }
.panel .desc { font-size: 14.5px; line-height: 1.75; color: var(--txt); margin-bottom: 22px; }
.panel .stack {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px;
}
.panel .stack span {
  font-size: 11px; color: var(--mut);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 9px;
}
.panel .live {
  display: inline-block;
  color: var(--bg);
  background: var(--accent);
  font-size: 12.5px;
  font-weight: 700;
  padding: 9px 18px;
  border-radius: 8px;
  text-decoration: none;
  letter-spacing: 0.02em;
}
.panel .live:hover { opacity: 0.88; }

.hint {
  position: fixed;
  bottom: 28px; right: 28px;
  z-index: 15;
  font-size: 11px;
  color: var(--mut);
  letter-spacing: 0.03em;
}

@media (max-width: 720px) {
  .hero { left: 20px; right: 20px; max-width: none; bottom: 24px; }
  .hero h1 { font-size: 26px; }
  .legend { display: none; }
  .panel { margin: 24px 14px; padding: 28px 22px 32px; }
  .hint { display: none; }
}