* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, sans-serif;
}

body {
  background: #000;
  color: #e0e0e0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  margin-top: 70px;
}

header h1 {
  font-size: 30px;
}

header p {
  margin-top: 6px;
  font-size: 14px;
  color: #aaa;
}

main {
  margin: 50px auto;
  width: 90%;
  max-width: 520px;
  text-align: center;
}

textarea {
  width: 100%;
  height: 120px;
  padding: 14px;
  background: transparent;
  border: 1px solid #444;
  color: #fff;
  font-size: 14px;
  resize: none;
}

textarea:focus {
  outline: none;
  border-color: #e0e0e0;
}

.note {
  margin-top: 8px;
  font-size: 12px;
  color: #888;
}

button {
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  background: #e0e0e0;
  border: none;
  color: #000;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: #fff;
}

#result {
  margin-top: 30px;
  text-align: left;
  font-size: 14px;
  line-height: 1.6;
}

.hash {
  font-family: monospace;
  font-size: 12px;
  color: #aaa;
  word-break: break-all;
}

.reused {
  color: #fff;
}

footer {
  margin-top: auto;
  text-align: center;
  padding: 20px;
  font-size: 12px;
  color: #777;
}