:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #68758a;
  --line: #d9e1ec;
  --primary: #1769aa;
  --primary-dark: #0d4f82;
  --success: #167a55;
  --danger: #b42318;
  --soft-blue: #eaf4ff;
  --soft-green: #e8f7ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

.shell {
  width: min(960px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 40px 0;
}

.header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: 0;
}

.schema-status {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 9px 12px;
  color: var(--muted);
  font-size: 14px;
}

.schema-status.ok {
  border-color: #b9dfca;
  background: var(--soft-green);
  color: var(--success);
}

.schema-status.error {
  border-color: #f0b8b2;
  background: #fff1f0;
  color: var(--danger);
}

.tool-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 32px rgba(23, 32, 51, 0.07);
  overflow: hidden;
}

.convert-form {
  padding: 24px;
}

.drop-zone {
  display: grid;
  place-items: center;
  min-height: 240px;
  border: 2px dashed #aebbd0;
  border-radius: 8px;
  background: #fbfdff;
  cursor: pointer;
  text-align: center;
  transition: border-color 160ms ease, background 160ms ease;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--primary);
  background: var(--soft-blue);
}

.drop-zone input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--primary);
  color: #ffffff;
  font-size: 30px;
  line-height: 1;
}

.drop-title {
  display: block;
  max-width: 100%;
  padding: 0 16px;
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.drop-meta {
  display: block;
  margin-top: 8px;
  padding: 0 16px;
  color: var(--muted);
  font-size: 14px;
  overflow-wrap: anywhere;
}

.options-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
}

.checkbox-row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 14px;
}

.checkbox-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

button,
.download-link {
  min-height: 42px;
  border: 0;
  border-radius: 8px;
  padding: 0 18px;
  background: var(--primary);
  color: #ffffff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

button:hover,
.download-link:hover {
  background: var(--primary-dark);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

.result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding: 18px 24px;
  background: #fbfcfe;
}

.result-label {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 13px;
}

.result strong {
  display: block;
  font-size: 17px;
  overflow-wrap: anywhere;
}

.result p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.summary-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px 16px;
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.summary-item strong {
  display: block;
  margin-top: 4px;
  font-size: 20px;
}

@media (max-width: 680px) {
  .shell {
    width: min(100vw - 20px, 960px);
    padding: 20px 0;
  }

  .header,
  .options-row,
  .result {
    align-items: stretch;
    flex-direction: column;
  }

  h1 {
    font-size: 26px;
  }

  .convert-form,
  .result {
    padding: 18px;
  }

  .drop-zone {
    min-height: 210px;
  }

  button,
  .download-link {
    width: 100%;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }
}