:root {
  color-scheme: dark;
  --ink: #e8f5f0;
  --muted: #8ca7a1;
  --panel: #0d1819;
  --panel-soft: #122224;
  --line: #294144;
  --cyan: #62e4dc;
  --amber: #ffca70;
  --red: #ff806c;
  --page: #060b0d;
  font-family: ui-monospace, "Cascadia Mono", "IBM Plex Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 25% 10%, rgba(35, 111, 107, .16), transparent 28rem),
    var(--page);
}

button, input { font: inherit; }

button {
  border: 1px solid var(--cyan);
  border-radius: 2px;
  padding: .62rem .8rem;
  color: #031011;
  background: var(--cyan);
  cursor: pointer;
}

button:hover { filter: brightness(1.12); }
button:focus-visible, input:focus-visible, canvas:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.masthead {
  height: 5.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .8rem 1.2rem;
  border-bottom: 1px solid var(--line);
  background: rgba(6, 14, 16, .92);
}

h1, h2, p { margin: 0; }
h1 { font-size: clamp(1.25rem, 3vw, 1.8rem); font-weight: 500; letter-spacing: .05em; }
h2 { font-size: 1.05rem; font-weight: 600; }

.eyebrow {
  margin-bottom: .28rem;
  color: var(--cyan);
  font-size: .7rem;
  letter-spacing: .14em;
}

.scope {
  max-width: 50%;
  text-align: right;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.45;
}

.atlas-shell {
  height: calc(100% - 5.4rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20rem;
}

.viewport {
  position: relative;
  min-width: 0;
  min-height: 18rem;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(73, 128, 128, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(73, 128, 128, .045) 1px, transparent 1px);
  background-size: 32px 32px;
}

canvas { width: 100%; height: 100%; display: block; cursor: grab; touch-action: none; }
canvas.dragging { cursor: grabbing; }

.axis-key, .map-help, .map-status {
  position: absolute;
  pointer-events: none;
  color: var(--muted);
  font-size: .68rem;
  background: rgba(5, 12, 14, .76);
}

.axis-key { top: .8rem; left: .8rem; display: flex; gap: .8rem; padding: .38rem .48rem; }
.axis-x { color: #ff8b78; }
.axis-y { color: #75d1ff; }
.axis-z { color: #8ee295; }
.map-help { left: 50%; bottom: .7rem; transform: translateX(-50%); padding: .38rem .55rem; white-space: nowrap; }
.map-status { top: 50%; left: 50%; transform: translate(-50%, -50%); padding: .65rem .8rem; }
.map-status.ready { display: none; }
.map-status.error { color: var(--red); border: 1px solid var(--red); }

.panel {
  overflow-y: auto;
  padding: 1rem;
  border-left: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), #091214);
}

.search label, .control-grid label, .route-planner label { color: var(--muted); font-size: .76rem; }
.search-row { display: grid; grid-template-columns: 1fr auto; gap: .4rem; margin-top: .35rem; }
input[type="search"] {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: .58rem;
  color: var(--ink);
  background: #071012;
}

.route-planner { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.route-planner form { display: grid; gap: .35rem; margin-top: .7rem; }
.route-planner label:not(:first-child) { margin-top: .35rem; }
.route-actions { display: grid; grid-template-columns: repeat(2, 1fr); gap: .35rem; margin-top: .4rem; }
.route-actions button { min-width: 0; padding: .5rem .35rem; font-size: .7rem; }
.route-status { margin-top: .65rem; color: var(--muted); font-size: .7rem; line-height: 1.45; }
.route-status.success { color: var(--amber); }
.route-status.error { color: var(--red); }
.route-path { max-height: 9rem; overflow-y: auto; margin: .55rem 0 0; padding-left: 1.8rem; color: var(--muted); font-size: .68rem; }
.route-path li { padding: .18rem 0; }
.route-path li::marker { color: var(--amber); }

.control-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: .45rem;
  margin-top: 1.1rem;
}

.control-grid output { color: var(--amber); font-size: .76rem; }
.control-grid input { grid-column: 1 / -1; width: 100%; accent-color: var(--cyan); }
.secondary { color: var(--cyan); background: transparent; }
.wide { width: 100%; margin: 1rem 0; }

.details { border-top: 1px solid var(--line); padding-top: 1rem; }
.details h2 { overflow-wrap: anywhere; color: var(--amber); }
dl { margin: .75rem 0 0; }
dl div { display: grid; grid-template-columns: 1fr 1.25fr; gap: .6rem; padding: .42rem 0; border-top: 1px solid rgba(41, 65, 68, .55); }
dt { color: var(--muted); font-size: .72rem; }
dd { margin: 0; text-align: right; font-size: .72rem; overflow-wrap: anywhere; }

.legend { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; margin-top: 1.1rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .7rem; }
.legend h2 { grid-column: 1 / -1; color: var(--ink); }
.port { display: inline-block; width: .55rem; height: .55rem; margin-right: .35rem; border-radius: 50%; }
.port-a { background: #78f0e4; }
.port-c { background: #ffca70; }
.port-e { background: #ff806c; }
.port-u { background: #8ca7a1; }
.fatal { margin: 2rem; color: var(--red); }

@media (max-width: 760px) {
  body { overflow: auto; }
  .masthead { height: auto; min-height: 5rem; }
  .atlas-shell { height: auto; min-height: calc(100vh - 5rem); grid-template-columns: 1fr; grid-template-rows: 62vh auto; }
  .panel { border-top: 1px solid var(--line); border-left: 0; }
  .map-help { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}