/* TSP browser front end.
   Palette taken from the application icon: slate ink, teal signal, paper.
   No web fonts: this tool has to work on a locked-down machine and offline
   after the first load. */

:root {
  --ink: #0f172a;
  --ink-soft: #3b4658;
  --muted: #6b7686;
  --rule: #dfe3e8;
  --paper: #fbfbf9;
  --card: #ffffff;
  --teal: #2f6f6b;
  --teal-bright: #5ed6c8;
  --amber: #9a6b16;
  --red: #a33a34;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, monospace;

  --step: 1.5rem;
}

* { box-sizing: border-box; }

/* The hidden attribute loses to any author `display` declaration, so state it
   again with enough weight to win. */
[hidden] { display: none !important; }

body {
  margin: 0;
  padding: 0 var(--step) 5rem;
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

main, .masthead, .engine, footer {
  max-width: 46rem;
  margin-inline: auto;
}

/* -- masthead ---------------------------------------------------------- */

.masthead {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  padding: 3.5rem 0 1.5rem;
}

.mark {
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  border-radius: 11px;
  background: var(--ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3.5px;
  padding: 8px 0;
}
.mark span {
  display: block;
  height: 4px;
  border-radius: 2px;
  background: #f1f5f9;
}
.mark span:nth-child(1) { width: 32px; background: var(--teal-bright); }
.mark span:nth-child(2) { width: 25px; }
.mark span:nth-child(3) { width: 18px; }
.mark span:nth-child(4) { width: 10px; }

h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4.5vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.standfirst {
  margin: 0.5rem 0 0;
  max-width: 34rem;
  color: var(--ink-soft);
}

/* -- engine status ----------------------------------------------------- */

.engine {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  font: 500 0.82rem/1.4 var(--mono);
  color: var(--ink-soft);
}

.engine__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  flex: 0 0 auto;
}
.engine--loading .engine__dot { background: var(--amber); animation: pulse 1.3s ease-in-out infinite; }
.engine--ready   .engine__dot { background: var(--teal); }
.engine--failed  .engine__dot { background: var(--red); }
.engine--loading, .engine--ready { color: var(--ink); }

@keyframes pulse { 50% { opacity: 0.25; } }
@media (prefers-reduced-motion: reduce) {
  .engine--loading .engine__dot { animation: none; }
}

/* -- panels ------------------------------------------------------------ */

.panel {
  margin-top: 1.25rem;
  padding: 1.5rem;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
}

.label {
  margin: 0 0 1rem;
  font: 600 0.72rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* -- drop zone --------------------------------------------------------- */

.drop {
  border: 1.5px dashed var(--rule);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop:hover, .drop:focus-visible, .drop.is-over {
  border-color: var(--teal);
  background: #f4faf9;
  outline: none;
}
.drop__line { margin: 0; font-weight: 500; }
.drop__link { color: var(--teal); text-decoration: underline; text-underline-offset: 2px; }
.drop__note { margin: 0.35rem 0 0; font-size: 0.82rem; color: var(--muted); }

/* -- queue ------------------------------------------------------------- */

.queue { list-style: none; margin: 1rem 0 0; padding: 0; }

.queue li {
  padding: 0.7rem 0;
  border-top: 1px solid var(--rule);
}
.queue li:first-child { border-top: 0; }

.row__main {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Per-document actions sit on their own line, so the controls above keep
   their width on a narrow screen. */
.row__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  margin: 0.45rem 0 0.1rem;
  padding-left: 0.1rem;
}
.row__actions .link {
  padding: 0;
  font-size: 0.82rem;
}

.queue .name {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.93rem;
}
.queue .size { font: 0.78rem var(--mono); color: var(--muted); flex: 0 0 auto; }
.queue select { flex: 0 0 auto; }

.queue .state {
  flex: 0 0 auto;
  font: 0.78rem var(--mono);
  color: var(--muted);
  min-width: 5.5rem;
  text-align: right;
}
.queue .state--done { color: var(--teal); }
.queue .state--failed { color: var(--red); }

.queue .remove {
  flex: 0 0 auto;
  padding: 0 0.3rem;
  font-size: 1.1rem;
  line-height: 1;
  color: #b3bac4;
  text-decoration: none;
}
.queue .remove:hover:enabled { color: var(--red); }
.queue .remove:disabled { opacity: 0.3; cursor: default; }

/* -- controls ---------------------------------------------------------- */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-end;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

.field { display: grid; gap: 0.3rem; font-size: 0.85rem; color: var(--muted); }

select, .button, .link {
  font-family: inherit;
  font-size: 0.92rem;
}

select {
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink);
}

.actions { display: flex; align-items: center; gap: 0.75rem; }

.button {
  padding: 0.6rem 1.2rem;
  border: 0;
  border-radius: 7px;
  background: var(--ink);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.button:hover { background: #1d2634; }
.button:disabled { background: #c4cad3; cursor: not-allowed; }
.button--quiet { background: var(--teal); }
.button--quiet:hover { background: #25574f; }

.link {
  border: 0;
  background: none;
  color: var(--teal);
  cursor: pointer;
  padding: 0.4rem 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }

/* -- progress ---------------------------------------------------------- */

.progress { margin-top: 1.1rem; }

.progress__track {
  height: 4px;
  border-radius: 2px;
  background: #e6e9ee;
  overflow: hidden;
}
.progress__fill {
  height: 100%;
  background: var(--teal);
  transition: width 0.15s linear;
}
.progress__label {
  margin: 0.5rem 0 0;
  font: 0.78rem var(--mono);
  color: var(--muted);
}
@media (prefers-reduced-motion: reduce) {
  .progress__fill { transition: none; }
}

/* -- per-row toggle ---------------------------------------------------- */

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  flex: 0 0 auto;
  font-size: 0.8rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}
.toggle input { accent-color: var(--teal); cursor: pointer; margin: 0; }
.toggle input:disabled { cursor: default; }

/* -- notice ------------------------------------------------------------ */

.notice {
  margin: 1.1rem 0 0;
  padding: 0.8rem 0.9rem;
  border: 1px solid #e7d8b4;
  border-left: 3px solid var(--amber);
  border-radius: 6px;
  background: #fdf9f0;
  font-size: 0.88rem;
  line-height: 1.5;
  color: #6b5420;
}
.notice a { color: var(--amber); }

.link--stop { color: var(--red); }

/* -- meter: the signature element -------------------------------------- */

.meter__bar {
  height: 10px;
  border-radius: 5px;
  background: var(--ink);
  overflow: hidden;
}
.meter__kept {
  height: 100%;
  background: var(--teal-bright);
  transition: width 0.4s ease;
}
@media (prefers-reduced-motion: reduce) {
  .meter__kept { transition: none; }
}

.readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(6.5rem, 1fr));
  gap: 1rem;
  margin: 1.1rem 0 0;
}
.readout dt {
  font: 0.72rem/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.readout dd {
  margin: 0.35rem 0 0;
  font: 600 1.35rem/1 var(--mono);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.meter__note { margin: 1rem 0 0; font-size: 0.8rem; color: var(--muted); }

.results {
  margin-top: 1.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
}

/* Distinguishes the batch actions from the per-document ones on the rows
   above, which carry the same verbs. */
.label--sub {
  margin: 0 0 0.8rem;
  font-size: 0.68rem;
}

.results__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}
.results__row--quiet {
  margin-top: 0.9rem;
  gap: 1.25rem;
  font-size: 0.88rem;
}

.button--plain {
  background: var(--card);
  color: var(--ink);
  border: 1px solid var(--rule);
}
.button--plain:hover { background: #f4f6f8; }

.hint {
  margin: 0.75rem 0 0;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
  max-width: 34rem;
}

.log {
  margin: 1rem 0 0;
  font: 0.82rem/1.5 var(--mono);
  color: var(--muted);
  white-space: pre-wrap;
}
.log:empty { display: none; }

/* -- failure ----------------------------------------------------------- */

.failure {
  margin-top: 1.25rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid #e8cfcd;
  border-left: 3px solid var(--red);
  border-radius: 8px;
  background: #fdf7f6;
}

.failure__lead {
  margin: 0;
  font-weight: 600;
  color: #7f2d28;
}
.failure__hint {
  margin: 0.4rem 0 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #8a5450;
}
.failure__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}
.failure__more {
  margin-top: 0.9rem;
  font-size: 0.82rem;
}
.failure__more summary {
  cursor: pointer;
  color: var(--muted);
  font: 0.8rem var(--mono);
}
.failure__more pre {
  margin: 0.6rem 0 0;
  padding: 0.7rem 0.8rem;
  max-height: 15rem;
  overflow: auto;
  border-radius: 6px;
  background: var(--ink);
  color: #cbd5e1;
  font: 0.74rem/1.5 var(--mono);
  white-space: pre-wrap;
  word-break: break-word;
}

footer {
  margin-top: 2.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}
footer a { color: var(--teal); }

@media (max-width: 34rem) {
  .queue li { flex-wrap: wrap; }
  .queue .state { text-align: left; min-width: 0; }
  .controls { align-items: stretch; }
}