body { margin: 0; color: #29313d; background: #f3f5f8; font: 14px/1.5 system-ui, sans-serif; }
main { padding: 14px 24px 24px; max-width: 1600px; margin: auto; }
button, select, input { font: inherit; }
button, select { min-height: 36px; padding: 6px 10px; border: 1px solid #c7d0dc; border-radius: 4px; color: inherit; background: white; }
button { cursor: pointer; }
button:disabled { opacity: .55; cursor: default; }
a { color: #345d8b; text-underline-offset: 3px; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible, a:focus-visible { outline: 2px solid #366bcc; outline-offset: 3px; }
.document-actions, .output-controls, .output-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.file-picker { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-weight: 600; }
.file-picker input { max-width: 250px; font-weight: 400; }
#status { display: block; color: #56677a; min-height: 24px; margin: 12px 0; font-size: 12px; }
.workspace { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 20px; }
.source-panel, .output-panel { min-width: 0; border: 1px solid #d8dfe8; border-radius: 6px; background: #fff; overflow: hidden; }
.panel-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; min-height: 48px; padding: 0 16px; border-bottom: 1px solid #e0e5eb; }
.panel-heading h1, .panel-heading h2 { margin: 0; font-size: 14px; font-weight: 600; }
.panel-heading span { color: #647183; font-size: 12px; }
#pages { height: min(740px,calc(100svh - 230px)); min-height: 380px; overflow-y: auto; overflow-x: hidden; scrollbar-gutter: stable; background: #e9edf2; }
.output-controls { padding: 14px 16px 0; }
.output-controls label { font-weight: 600; font-size: 12px; }
.output-controls select { max-width: 100%; min-width: 0; }
.output-actions { width: 100%; }
.result { display: block; margin: 14px 16px; font-size: 12px; font-weight: 600; }
textarea { box-sizing: border-box; display: block; width: 100%; height: min(470px,calc(100svh - 400px)); min-height: 260px; resize: vertical; padding: 12px; margin-top: 6px; border: 1px solid #c7d0dc; border-radius: 3px; background: #f9fafb; color: inherit; font: 13px/1.6 ui-monospace, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
details { margin: 16px; padding-top: 12px; border-top: 1px solid #e0e5eb; font-size: 12px; color: #5d6b7c; }
summary { color: #415571; font-weight: 600; cursor: pointer; }
@media (max-width: 800px) { main { padding: 12px; } .workspace { grid-template-columns: 1fr; gap: 14px; } #pages { height: 420px; min-height: 0; } textarea { height: 340px; } }