:root {
  color-scheme: dark;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #e9eef6;
  background: #0b1017;
}

* {
  box-sizing: border-box;
}

body {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 100vh;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 10%, rgb(37 59 85 / 28%), transparent 42%),
    #0b1017;
}

header {
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid #273241;
  background: rgb(11 16 23 / 88%);
  backdrop-filter: blur(16px);
}

header p {
  margin: 0;
  color: #96a4b7;
  font-size: 0.82rem;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.6rem 1rem;
  color: #aab5c4;
  font-size: 0.76rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  white-space: nowrap;
}

.dot {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #5f6c7c;
}

.dot.online {
  background: #4bc88b;
}

.dot.offline {
  background: #6c7787;
}

.dot.local {
  background: #ffb44a;
}

.dot.remote {
  background: #62a8ff;
}

.dot.system {
  background: #ad78df;
}

#topology {
  position: relative;
  min-height: 34rem;
  overflow: hidden;
}

#topology::before {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(#334154 1px, transparent 1px);
  background-size: 26px 26px;
  content: "";
  opacity: 0.22;
}

#edges,
#nodes {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#empty {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: 0;
  color: #96a4b7;
  transform: translate(-50%, -50%);
}

.node {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 0.38rem;
  width: 14rem;
  padding: 0.78rem 0.85rem;
  border: 1px solid #354254;
  border-radius: 0.9rem;
  color: #e9eef6;
  background: linear-gradient(rgb(21 29 40 / 94%), rgb(21 29 40 / 94%)), #0b1017;
  box-shadow: 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
  transform: translate(-50%, -50%);
  transition: border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.node.offline {
  color: #a2adba;
  background: linear-gradient(rgb(23 28 35 / 94%), rgb(23 28 35 / 94%)), #0b1017;
  border-color: #414a57;
}

.node.hub {
  border-color: #3f8f91;
  background: linear-gradient(rgb(18 46 51 / 96%), rgb(18 46 51 / 96%)), #0b1017;
  box-shadow: 0 0 0 3px rgb(77 190 190 / 10%), 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
}

.node.hub.offline {
  border-color: #46565d;
  background: linear-gradient(rgb(24 35 39 / 96%), rgb(24 35 39 / 96%)), #0b1017;
  box-shadow: 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
}

.node.repeater.online {
  border-color: #3f8f91;
  background: linear-gradient(rgb(18 46 51 / 96%), rgb(18 46 51 / 96%)), #0b1017;
  box-shadow: 0 0 0 3px rgb(77 190 190 / 10%), 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
}

.node.repeater.tx-local {
  border-color: #d99132;
  background: linear-gradient(rgb(61 43 22 / 96%), rgb(61 43 22 / 96%)), #0b1017;
  box-shadow: 0 0 0 3px rgb(255 180 74 / 12%), 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
}

.node.repeater.tx-remote {
  border-color: #4b92e7;
  background: linear-gradient(rgb(22 43 68 / 96%), rgb(22 43 68 / 96%)), #0b1017;
  box-shadow: 0 0 0 3px rgb(98 168 255 / 12%), 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
}

.node.repeater.tx-system {
  border-color: #ad78df;
  background: linear-gradient(rgb(48 31 65 / 96%), rgb(48 31 65 / 96%)), #0b1017;
  box-shadow: 0 0 0 3px rgb(173 120 223 / 14%), 0 0.8rem 2.2rem rgb(0 0 0 / 24%);
}

.node-kind {
  display: inline-flex;
  align-items: center;
  min-height: 1.15rem;
  padding: 0.08rem 0.34rem;
  border: 1px solid #4f999b;
  border-radius: 999px;
  color: #a5e0df;
  font-size: 0.56rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.08em;
}

.node-kind[hidden] {
  display: none;
}

.online-label {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  color: #91d9b4;
  font-size: 0.7rem;
}

.offline .online-label {
  color: #919ba8;
}

.node-name {
  min-height: 0;
  margin: 0;
  overflow: hidden;
  font-size: 0.8rem;
  font-weight: 650;
  line-height: 1.15;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.hub .node-name {
  color: #c5e3e2;
}

.node-meta {
  display: flex;
  align-items: center;
  min-height: 1.2rem;
  overflow: hidden;
  line-height: 1.1;
  white-space: nowrap;
}

.node-frequency {
  display: block;
  overflow: hidden;
  color: #aeb8c6;
  font-size: 0.62rem;
  letter-spacing: 0.01em;
  text-overflow: ellipsis;
}

.node-frequency[hidden] {
  display: none;
}

.node-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  color: #aeb8c6;
  font-size: 0.7rem;
}

.node-footer {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 0.45rem;
  min-width: 0;
}

.node-details {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.28rem;
  min-width: 0;
}

.node-audio {
  display: flex;
  align-items: center;
  align-self: stretch;
  gap: 0.35rem;
}

.node-audio[hidden] {
  display: none;
}

.node-audio .spectrum {
  display: flex;
  gap: 1px;
  align-items: flex-end;
  width: 3.8rem;
  height: 1.65rem;
  padding: 0.2rem;
  overflow: hidden;
  border: 1px solid #3f777a;
  border-radius: 0.28rem;
  background: #0b1519;
}

.node-audio .spectrum .bar {
  flex: 1;
  height: 100%;
  border-radius: 1px;
  background: linear-gradient(to top, #52c9c3, #a5e0df);
  transform: scaleY(0.02);
  transform-origin: bottom;
  transition: transform 90ms ease-out;
}

.audio-toggle {
  display: grid;
  flex: none;
  width: 1.8rem;
  height: 1.8rem;
  padding: 0;
  border: 1px solid #58b5b6;
  border-radius: 50%;
  color: #b9ecea;
  background: #10282c;
  font: inherit;
  font-size: 0.58rem;
  cursor: pointer;
  place-items: center;
}

.audio-toggle:focus-visible {
  outline: 2px solid #72efe7;
  outline-offset: 2px;
}

.audio-toggle[aria-pressed="true"] {
  color: #fff;
  border-color: #ec6565;
  background: #a83b3b;
}

.node-state {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.node-status[hidden] {
  display: none;
}

.tx-label {
  color: #d3d9e2;
  font-weight: 600;
}

.tx-label[hidden],
.online-label[hidden],
.node-status time[hidden] {
  display: none;
}

.tx-local .tx-label {
  color: #ffd08d;
}

.tx-remote .tx-label {
  color: #a8d1ff;
}

.tx-system .tx-label {
  color: #d8b1fb;
}

@media (max-width: 680px) {
  header {
    align-items: center;
    flex-direction: row;
    gap: 0.5rem;
    padding: 0.65rem 0.7rem;
  }

  header p {
    font-size: 0.68rem;
    white-space: nowrap;
  }

  .legend {
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: 0.35rem;
    min-width: 0;
    font-size: 0.62rem;
  }

  .legend span {
    gap: 0.22rem;
  }

  .legend .dot {
    width: 0.42rem;
    height: 0.42rem;
  }

  #topology {
    min-height: 38rem;
  }

  .node {
    gap: 0.28rem;
    width: 6rem;
    padding: 0.52rem 0.56rem;
  }

  .node.has-audio {
    display: grid;
    grid-template-rows: auto auto;
    grid-template-columns: minmax(0, 1fr) 2.1rem;
    gap: 0.28rem 0.45rem;
    width: 10rem;
  }

  .node.has-audio .node-name {
    grid-row: 1;
    grid-column: 1;
  }

  .node.has-audio .node-footer,
  .node.has-audio .node-details {
    display: contents;
  }

  .node.has-audio .node-status {
    grid-row: 2;
    grid-column: 1;
  }

  .node.has-audio .node-audio {
    align-self: center;
    justify-self: center;
    grid-row: 1 / 3;
    grid-column: 2;
  }

  .node-name {
    font-size: 0.68rem;
  }

  .node-meta,
  .node-status time {
    display: none;
  }

  .node-audio .spectrum {
    display: none;
  }

  .audio-toggle {
    width: 1.45rem;
    height: 1.45rem;
    font-size: 0.48rem;
  }

  .node-status,
  .online-label {
    font-size: 0.62rem;
  }

  .node-status {
    gap: 0.25rem;
  }

  .node-state {
    gap: 0.3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .node {
    transition: none;
  }
}