* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: #fffff8;
  font-family: Georgia, 'Times New Roman', serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 40px 20px;
  text-align: center;
}

main {
  max-width: 600px;
  width: 100%;
}

h1 {
  font-size: 48px;
  font-weight: normal;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 18px;
  color: #555;
  margin-bottom: 32px;
}

.btn {
  display: inline-block;
  padding: 14px 40px;
  font-size: 18px;
  font-family: inherit;
  color: #fff;
  background: #0066cc;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s;
}

.btn:hover {
  background: #0052a3;
}

.trace-box {
  margin-top: 12px;
  padding: 24px;
  background: rgba(255,255,255,0.8);
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 12px;
  text-align: left;
}

.trace-box p {
  margin-bottom: 12px;
  color: #333;
}

.url-display {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #f5f5f0;
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid rgba(0,0,0,0.08);
}

.url-display code {
  flex: 1;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  word-break: break-all;
  color: #000;
}

.copy-btn {
  padding: 8px 16px;
  font-size: 14px;
  font-family: inherit;
  background: #0066cc;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
}

.copy-btn:hover {
  background: #0052a3;
}

.copied-msg {
  font-size: 14px;
  color: #0a0;
  opacity: 0;
  transition: opacity 0.3s;
  margin-top: 8px;
  margin-bottom: 0 !important;
}

.copied-msg.show {
  opacity: 1;
}