:root {
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--tt-bg, #f5f7fb);
  color: var(--tt-text, #172033);
  font-family: var(--tt-font, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
  line-height: 1.5;
}

.page {
  width: min(100% - 32px, var(--tt-maxw, 1180px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: var(--tt-gap, 18px);
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--tt-primary, #2563eb);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-size: .78rem;
}

h1, h2 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

h2 {
  font-size: 1rem;
}

.intro {
  margin: 10px 0 0;
  color: var(--tt-muted, #5d6b82);
  max-width: 760px;
}

.tool-card,
.content-slot {
  background: var(--tt-surface, #ffffff);
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  box-shadow: var(--tt-shadow, 0 10px 30px rgba(23, 32, 51, .08));
}

.tool-card {
  padding: 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

label,
.panel-head h2 {
  font-weight: 700;
}

textarea,
input,
select,
button,
pre {
  font: inherit;
}

textarea,
input[type="text"],
input[type="number"],
select,
pre {
  width: 100%;
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: calc(var(--tt-radius, 12px) - 4px);
  background: var(--tt-surface-soft, #fbfdff);
  color: var(--tt-text, #172033);
}

textarea,
input[type="text"],
input[type="number"],
select {
  padding: 10px 12px;
}

textarea {
  resize: vertical;
  min-height: 180px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

#json-output,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .92rem;
}

.file-row {
  display: grid;
  grid-template-columns: minmax(150px, auto) minmax(180px, 1fr) minmax(180px, auto);
  gap: 10px;
  align-items: center;
  margin-top: 12px;
}

.muted {
  color: var(--tt-muted, #5d6b82);
  font-size: .9rem;
}

.controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 14px;
  margin: 18px 0;
  padding: 14px;
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  background: var(--tt-surface-soft, #fbfdff);
}

.field {
  display: grid;
  gap: 6px;
}

.checkbox-field {
  grid-template-columns: auto 1fr;
  align-items: center;
  align-content: center;
}

.checkbox-field input {
  width: 18px;
  height: 18px;
}

.actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: calc(var(--tt-radius, 12px) - 4px);
  padding: 10px 14px;
  background: var(--tt-surface, #ffffff);
  color: var(--tt-text, #172033);
  cursor: pointer;
  font-weight: 700;
}

button:hover {
  border-color: var(--tt-primary, #2563eb);
}

#convert-button,
#copy-button,
#download-button {
  background: var(--tt-primary, #2563eb);
  border-color: var(--tt-primary, #2563eb);
  color: var(--tt-surface, #ffffff);
}

#convert-button:hover,
#copy-button:hover,
#download-button:hover {
  background: var(--tt-primary-dark, #1d4ed8);
  border-color: var(--tt-primary-dark, #1d4ed8);
}

.message {
  border-radius: calc(var(--tt-radius, 12px) - 4px);
  padding: 10px 12px;
  margin-bottom: 12px;
}

.message:empty {
  display: none;
}

.error {
  color: var(--tt-danger, #b42318);
  border: 1px solid var(--tt-danger, #b42318);
  background: var(--tt-surface, #ffffff);
}

.warning {
  color: var(--tt-text, #172033);
  background: var(--tt-primary-soft, #e9f1ff);
  border: 1px solid var(--tt-line, #d9e1ef);
}

.results-grid {
  display: grid;
  grid-template-columns: minmax(260px, .8fr) minmax(320px, 1.2fr);
  gap: 16px;
}

.result-panel {
  min-width: 0;
}

pre {
  min-height: 240px;
  max-height: 420px;
  overflow: auto;
  margin: 0;
  padding: 12px;
  white-space: pre-wrap;
}

.content-slot {
  margin-top: 22px;
  padding: 18px;
}

.content-slot p {
  color: var(--tt-muted, #5d6b82);
}

@media (max-width: 840px) {
  .controls,
  .results-grid,
  .file-row {
    grid-template-columns: 1fr;
  }

  .page {
    width: min(100% - 20px, var(--tt-maxw, 1180px));
    padding-top: 18px;
  }
}