:root {
  color-scheme: light;
  font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
body {
  margin: 0;
  background: linear-gradient(180deg, #f4f7ff 0%, #ecf4ff 100%);
  min-height: 100vh;
}
.container {
  width: min(760px, 92vw);
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(29, 50, 113, 0.12);
  padding: 32px;
  margin: 30px auto;
}
h1 { margin: 0; font-size: 30px; }
.subtitle { color: #506080; margin-bottom: 24px; }
.tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  background: #f1f5ff;
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 18px;
}
.tab {
  border: 0;
  background: transparent;
  border-radius: 8px;
  padding: 10px;
  font-size: 15px;
  cursor: pointer;
}
.tab.active { background: #fff; font-weight: 600; box-shadow: 0 4px 14px rgba(45, 76, 170, 0.14); }
.panel { display: none; }
.panel.active { display: block; }
.upload-box {
  border: 2px dashed #b7c7ef;
  border-radius: 12px;
  display: block;
  text-align: center;
  padding: 30px;
  cursor: pointer;
  color: #3b4a6b;
}
.upload-box input { display: none; }
.download-limit-row {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.download-limit-row input {
  width: 100px;
  border: 1px solid #cbd8f8;
  border-radius: 8px;
  padding: 6px 8px;
}
.primary {
  margin-top: 14px;
  border: 0;
  background: #2f66ff;
  color: #fff;
  border-radius: 10px;
  padding: 11px 20px;
  font-size: 15px;
  cursor: pointer;
}
.primary:disabled { opacity: 0.5; cursor: not-allowed; }
.progress-bar {
  width: 100%;
  height: 12px;
  background: #e8efff;
  border-radius: 999px;
  overflow: hidden;
  margin-top: 16px;
}
.progress-bar > div {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, #2f66ff, #4da2ff);
  transition: width 0.2s;
}
.code-box {
  margin-top: 16px;
  padding: 14px;
  border-radius: 10px;
  background: #eef5ff;
  color: #24345b;
}
.code-box span { font-weight: 700; letter-spacing: 2px; font-size: 20px; }
.download-row {
  display: flex;
  gap: 10px;
}
.download-row input {
  flex: 1;
  border: 1px solid #cbd8f8;
  border-radius: 10px;
  padding: 10px;
  font-size: 16px;
}
.muted { margin-top: 10px; color: #5c6f95; }
.hidden { display: none; }