body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #181818;
  color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}
.container {
  background: #232323;
  border: 1px solid #444;
  border-radius: 18px;
  padding: 36px;
  max-width: 640px;
  width: 100%;
  box-shadow: 0 8px 32px #000;
}
h2 {
  color: #fff;
  text-align: center;
  margin-bottom: 28px;
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 1px;
}
.input-group {
  display: flex;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
#urlInput {
  flex: 1;
  min-width: 260px;
  padding: 14px 18px;
  background: #222;
  border: 1.5px solid #444;
  border-radius: 10px;
  color: #fff;
  font-size: 16px;
}
#urlInput:focus {
  outline: none;
  border-color: #fff;
  background: #191919;
}
#urlInput::placeholder {
  color: #aaa;
}
button {
  padding: 14px 28px;
  background: #191919;
  border: 1.5px solid #444;
  border-radius: 10px;
  color: #fff;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.2s, border 0.2s;
}
button:hover, button:focus {
  background: #101010;
  border-color: #fff;
}
#copied {
  text-align: center;
  margin: 12px 0;
  color: #fff;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.3s;
}
#copied.show {
  opacity: 1;
}
.output-section {
  margin: 22px 0;
}
.output-section h3 {
  color: #fff;
  margin-bottom: 10px;
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 1px;
}
.output-box {
  background: #222;
  border: 1px solid #444;
  border-radius: 10px;
  padding: 15px;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  line-height: 1.6;
  word-break: break-all;
  min-height: 48px;
  color: #fff;
  cursor: pointer;
}
.output-box:empty::before {
  content: "BBCode will appear here...";
  color: #555;
  font-style: italic;
}
.app-footer {
  margin-top: 36px;
  padding: 18px 0 0 0;
  text-align: center;
  font-size: 1rem;
  color: #bbb;
  border-top: 1px solid #333;
  letter-spacing: 0.2px;
  background: none;
}
.app-footer strong {
  color: #fff;
  font-weight: 600;
  margin-right: 2px;
}
.code-tag {
  background: #282828;
  border-radius: 4px;
  padding: 2px 6px;
  font-family: monospace;
  color: #fff;
  margin: 0 2px;
}
@media (max-width: 600px) {
  .container {
    padding: 18px;
    margin: 10px;
  }
  .input-group {
    flex-direction: column;
  }
  #urlInput {
    min-width: unset;
  }
  h2 {
    font-size: 1.3rem;
  }
}