.pn-page {
  max-width: 1000px;
  margin: 1.4rem auto 2rem;
  padding: 0 1rem;
  color: #10253f;
}

.pn-header h1 {
  margin: 0 0 0.35rem;
  color: #f97316;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.pn-header p {
  margin: 0 0 1rem;
  font-size: 1rem;
}

.pn-card {
  background: #ffffff;
  border: 1px solid #c9d7ea;
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 12px 28px rgba(22, 48, 80, 0.1);
}

.pn-card h2 {
  margin: 0 0 0.35rem;
}

.pn-card > p {
  margin: 0 0 0.7rem;
}

.pn-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.8rem;
}

.pn-toolbar p {
  margin: 0;
  font-weight: 700;
}

.pn-status.ok {
  color: #18803c;
}

.pn-status.bad {
  color: #b4362e;
}

.pn-toolbar button {
  border: 0;
  border-radius: 0.65rem;
  padding: 0.45rem 0.8rem;
  background: #1f4977;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.pn-canvas-wrap {
  border: 1px solid #d4deea;
  border-radius: 0.8rem;
  padding: 0.4rem;
  background: linear-gradient(160deg, #f5f9ff 0%, #f8fbf2 100%);
}

#network-canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  background: #ffffff;
  border-radius: 0.6rem;
  touch-action: none;
}

.pn-edge {
  stroke: #2e4f78;
  stroke-width: 3;
  stroke-linecap: round;
}

.pn-vertex circle {
  fill: #f97316;
  stroke: #ffffff;
  stroke-width: 2.5;
  cursor: grab;
}

.pn-vertex.dragging circle {
  cursor: grabbing;
}

.pn-vertex text {
  fill: #12345c;
  font-weight: 700;
  font-size: 14px;
  pointer-events: none;
  text-anchor: middle;
  dominant-baseline: middle;
}

/* ── Success dialog ── */

.pn-dialog {
  border: none;
  border-radius: 1rem;
  padding: 1.8rem 2rem;
  max-width: 360px;
  width: 90vw;
  text-align: center;
  box-shadow: 0 20px 48px rgba(22, 48, 80, 0.25);
  font-family: inherit;
}

.pn-dialog::backdrop {
  background: rgba(16, 37, 63, 0.45);
}

.pn-dialog h2 {
  margin: 0 0 0.6rem;
  font-size: 1.6rem;
  color: #18803c;
}

.pn-dialog p {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  color: #10253f;
}

.pn-dialog-actions {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.pn-dialog-actions button {
  border: 0;
  border-radius: 0.65rem;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

#dialog-copy {
  background: #f97316;
  color: #fff;
}

#dialog-next {
  background: #1f4977;
  color: #fff;
}

.pn-copied-msg {
  margin: 0.6rem 0 0;
  font-size: 0.9rem;
  color: #18803c;
  font-weight: 600;
}

.pn-challenge {
  font-weight: 700;
  color: #b45309;
}

.pn-challenge-result {
  font-weight: 700;
  margin: 0 0 1rem;
}

.pn-challenge-result.win {
  color: #18803c;
}

.pn-challenge-result.tie {
  color: #b45309;
}

.pn-challenge-result.lose {
  color: #b4362e;
}

@media (max-width: 720px) {
  .pn-page {
    padding: 0 0.55rem;
  }

  .pn-toolbar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0.55rem;
  }

  #crossing-count,
  #move-count {
    min-height: 1.35rem;
  }

  #challenge-target,
  #status-message {
    grid-column: 1 / -1;
  }

  #status-message {
    display: flex;
    align-items: center;
    min-height: 2.7rem;
  }

  .pn-toolbar button {
    width: 100%;
  }
}