/* ====== 全体 ====== */
body {
  background: #0f0f14;
  color: #e5e7eb;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

h1, h2 {
  margin: 0 0 12px;
}

/* ====== ボタン ====== */
button {
  margin-top: 10px;
  padding: 10px 18px;
  background: #6366f1;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  color: white;
  font-size: 14px;
}

button:hover {
  background: #818cf8;
}

/* ====== 入力欄 ====== */
input, textarea {
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #374151;
  background: #111827;
  color: white;
}

textarea {
  min-height: 80px;
}

/* ====== レイアウト ====== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #1f2937;
    color: white;
}

.header-info {
    text-align: right;
    line-height: 1.4;
    font-size: 14px;
}

#network-label,
#node-info-header,
#node-height-header {
    color: #cbd5e1; /* ライトグレー */
}


.container {
  padding: 20px;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
}

footer {
  text-align: center;
  padding: 16px;
  background: #1f2937;
  margin-top: 20px;
}