* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, Arial, sans-serif;
  background: linear-gradient(135deg, #f8fafc, #eef2ff);
  color: #111827;
}

.header {
  text-align: center;
  padding: 35px 15px;
}

.subtitle {
  color: #4b5563;
}

.container {
  max-width: 1000px;
  margin: auto;
  padding: 20px;
}

.content {
  margin-bottom: 30px;
}

.tool {
  background: #fff;
  padding: 25px;
  border-radius: 18px;
  box-shadow: 0 12px 30px rgba(0,0,0,.08);
}

.tool input,
.tool button {
  width: 100%;
  margin-bottom: 15px;
}

.tool button {
  padding: 14px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #4f46e5, #6366f1);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
}

.preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 25px;
}

.box {
  text-align: center;
}

.box img {
  max-width: 100%;
  border-radius: 12px;
  margin-bottom: 10px;
}

#downloadBtn {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 18px;
  background: #16a34a;
  color: #fff;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
}

.ai-tip {
  margin-top: 20px;
  font-size: 14px;
  color: #374151;
}

.internal-link {
  text-align: center;
  margin: 30px 0;
}

.internal-link a {
  color: #4f46e5;
  font-weight: 600;
  text-decoration: none;
}

.ad {
  margin: 30px 0;
}

.privacy {
  text-align: center;
  font-size: 14px;
  color: #374151;
}

.footer {
  text-align: center;
  padding: 20px;
  color: #6b7280;
}

@media (max-width: 768px) {
  .preview {
    grid-template-columns: 1fr;
  }
}