/* ==========================================================================
   CompressAndConvert
   Direction: a precision measuring instrument, not a web form. Plotter-pen
   palette (ink / magenta / blue on cool paper), DIN-style condensed display
   type, and one signature element — the ruler that shows the encoder's
   search converging on the requested size.
   ========================================================================== */

:root {
  /* plotter-pen palette */
  --paper:      #e4e7e1;
  --paper-hi:   #f3f5f0;
  --paper-lo:   #d5d9d2;
  --ink:        #131a22;
  --ink-soft:   #46525e;
  --ink-faint:  #8a949d;
  --rule:       #bdc4bc;
  --signal:     #da1e5c;   /* the measured result */
  --signal-dim: #f4c9d8;
  --trace:      #2447c7;   /* the requested target */
  --trace-dim:  #c3cdf1;

  --font-display: "Bahnschrift", "DIN Alternate", "Avenir Next Condensed",
                  "Roboto Condensed", "Arial Narrow", system-ui, sans-serif;
  --font-body: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system,
               "Helvetica Neue", Arial, sans-serif;
  --font-num: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;

  --s1: 4px;  --s2: 8px;  --s3: 12px; --s4: 16px;
  --s5: 24px; --s6: 32px; --s7: 48px; --s8: 64px;

  --edge: 2px;
  --line: 1px solid var(--rule);
  --shell-max: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #101821;
    --paper-hi:   #18222d;
    --paper-lo:   #0a1017;
    --ink:        #e2e7e3;
    --ink-soft:   #9aa6b0;
    --ink-faint:  #66737f;
    --rule:       #2b3844;
    --signal:     #ff477e;
    --signal-dim: #5c1730;
    --trace:      #7f97ef;
    --trace-dim:  #23315f;
  }
}

*, *::before, *::after { box-sizing: border-box; }

/* Any class here that sets `display` would otherwise beat the UA rule for the
   hidden attribute, leaving JS-hidden elements on screen. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  overflow-x: hidden;
  /* faint measuring grid, the paper this instrument is printed on */
  background-image:
    repeating-linear-gradient(to right, transparent 0 39px, var(--rule) 39px 40px),
    repeating-linear-gradient(to bottom, transparent 0 39px, var(--rule) 39px 40px);
  background-size: 40px 40px;
  background-attachment: fixed;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: var(--paper);
  opacity: 0.88;
  pointer-events: none;
  z-index: -1;
}

.num { font-family: var(--font-num); font-variant-numeric: tabular-nums; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip {
  position: absolute; left: -999px; top: 0; z-index: 20;
  background: var(--ink); color: var(--paper); padding: var(--s3) var(--s4);
}
.skip:focus { left: 0; }

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

.shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: var(--s5) var(--s4) var(--s7);
}

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

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--s4);
  padding-bottom: var(--s3);
  border-bottom: 3px solid var(--ink);
  margin-bottom: var(--s6);
}

.wordmark {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 6.4vw, 54px);
  line-height: 0.92;
  letter-spacing: -0.005em;
  text-transform: uppercase;
  display: flex;
  align-items: baseline;
  gap: 0.18em;
}
/* The wordmark demonstrates the product: each letter of "Compress" is
   narrower than the one before it. */
.wordmark__squeeze { display: inline-flex; }
.wordmark__squeeze i { font-style: normal; display: inline-block; }
.wordmark__squeeze i:nth-child(1) { font-stretch: 100%; letter-spacing: 0.01em; }
.wordmark__squeeze i:nth-child(2) { font-stretch:  97%; letter-spacing: 0.005em; }
.wordmark__squeeze i:nth-child(3) { font-stretch:  94%; letter-spacing: 0em; }
.wordmark__squeeze i:nth-child(4) { font-stretch:  91%; letter-spacing: -0.005em; }
.wordmark__squeeze i:nth-child(5) { font-stretch:  88%; letter-spacing: -0.01em; }
.wordmark__squeeze i:nth-child(6) { font-stretch:  85%; letter-spacing: -0.017em; }
.wordmark__squeeze i:nth-child(7) { font-stretch:  81%; letter-spacing: -0.024em; }
.wordmark__squeeze i:nth-child(8) { font-stretch:  77%; letter-spacing: -0.03em; }
.wordmark__amp { color: var(--signal); font-size: 0.62em; font-weight: 400; }
.wordmark__plain { font-stretch: 100%; }

.readouts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s5);
  margin: 0;
  padding-bottom: var(--s1);
}
.readout dt {
  font-family: var(--font-display);
  font-size: 11px;
  font-stretch: 85%;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.readout dd { margin: 2px 0 0; font-size: 13px; color: var(--ink-soft); }
.readout dd.warn { color: var(--signal); }

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

.stage {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s4);
  align-items: start;
}

.panel {
  background: var(--paper-hi);
  border: var(--line);
  border-radius: var(--edge);
  padding: var(--s5);
  min-width: 0;
}

.panel__label {
  margin: 0 0 var(--s3);
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  font-stretch: 85%;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: var(--s3);
}
.panel__label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}
.controls .panel__label { margin-top: var(--s6); }
.controls .panel__label:first-child { margin-top: 0; }

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

.drop {
  position: relative;
  border: 1.5px dashed var(--rule);
  border-radius: var(--edge);
  background:
    repeating-linear-gradient(to bottom, transparent 0 15px, var(--paper-lo) 15px 16px);
  transition: border-color 0.15s, background-color 0.15s;
}
.drop.is-over {
  border-color: var(--signal);
  border-style: solid;
  background-color: var(--signal-dim);
}
.drop__input {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0; cursor: pointer;
}
.drop__inner {
  padding: var(--s7) var(--s5);
  text-align: center;
  pointer-events: none;
}
.drop__mark {
  width: 48px; height: 40px;
  fill: none;
  stroke: var(--ink-faint);
  stroke-width: 2.4;
  stroke-linecap: square;
}
.drop.is-over .drop__mark { stroke: var(--signal); }
.drop__lead {
  margin: var(--s4) 0 var(--s1);
  font-family: var(--font-display);
  font-size: 22px;
  font-stretch: 90%;
  letter-spacing: 0.01em;
}
.drop__sub { margin: 0 0 var(--s5); color: var(--ink-soft); font-size: 14px; }
.drop__kinds {
  list-style: none;
  margin: 0; padding: var(--s4) 0 0;
  border-top: var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s3) var(--s4);
  text-align: left;
}
.drop__kinds li { min-width: 0; }
.drop__kinds b {
  display: block;
  font-family: var(--font-display);
  font-size: 11px; font-stretch: 85%;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink);
}
.drop__kinds span {
  display: block;
  font-size: 11.5px;
  color: var(--ink-faint);
  word-spacing: 0.3em;
  overflow-wrap: anywhere;
}

.linkish {
  background: none; border: 0; padding: 0;
  font: inherit; color: var(--signal);
  text-decoration: underline; text-underline-offset: 3px;
  cursor: pointer; pointer-events: auto;
}

/* --------------------------------------------------------- loaded source -- */

.source__head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: var(--s3); flex-wrap: wrap;
}
.source__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px; font-stretch: 92%;
  overflow-wrap: anywhere;
}
.ghost {
  background: none;
  border: var(--line);
  border-radius: var(--edge);
  color: var(--ink-soft);
  font: inherit; font-size: 12px;
  padding: 5px 10px;
  cursor: pointer;
  white-space: nowrap;
}
.ghost:hover { border-color: var(--ink); color: var(--ink); }

.facts {
  margin: var(--s4) 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: var(--s3);
  border-top: var(--line);
  padding-top: var(--s4);
}
.facts div { min-width: 0; }
.facts dt {
  font-family: var(--font-display);
  font-size: 10.5px; font-stretch: 85%;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint);
}
.facts dd {
  margin: 3px 0 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  overflow-wrap: anywhere;
}

.thumb { margin-top: var(--s4); }
.thumb img, .thumb video {
  display: block; max-width: 100%; max-height: 190px;
  border: var(--line); background: var(--paper-lo);
}
.thumb audio { width: 100%; }

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

.gate {
  color: var(--ink-faint);
  font-size: 14px;
  border: 1.5px dashed var(--rule);
  border-radius: var(--edge);
  padding: var(--s7) var(--s5);
  text-align: center;
}
.gate p { margin: 0; }

.formats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
}
.fmt { position: relative; }
.fmt input {
  position: absolute; opacity: 0;
  width: 100%; height: 100%; margin: 0; cursor: pointer;
}
.fmt__box {
  display: block;
  border: 1.5px solid var(--rule);
  border-radius: var(--edge);
  padding: 7px 12px;
  font-family: var(--font-display);
  font-size: 13.5px;
  font-stretch: 90%;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.12s, color 0.12s, background-color 0.12s;
}
.fmt input:hover + .fmt__box { border-color: var(--ink-soft); color: var(--ink); }
.fmt input:checked + .fmt__box {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper-hi);
}
.fmt input:focus-visible + .fmt__box { outline: 2px solid var(--signal); outline-offset: 2px; }
.fmt__box small {
  display: inline-block;
  margin-left: 6px;
  font-family: var(--font-num);
  font-size: 9.5px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--signal);
}
.fmt input:checked + .fmt__box small { color: var(--signal-dim); }

.formats__note {
  margin: var(--s3) 0 0;
  font-size: 12px;
  color: var(--ink-faint);
  min-height: 1.2em;
}

.modes { display: grid; gap: var(--s2); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.mode { position: relative; display: block; min-width: 0; }
.mode input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.mode__box {
  display: block; height: 100%;
  border: 1.5px solid var(--rule);
  border-radius: var(--edge);
  padding: var(--s3);
  cursor: pointer;
  transition: border-color 0.12s, background-color 0.12s;
}
.mode__box b {
  display: block;
  font-family: var(--font-display);
  font-size: 14px; font-stretch: 92%;
  letter-spacing: 0.02em;
}
.mode__box em {
  display: block; margin-top: 2px;
  font-style: normal; font-size: 11.5px; line-height: 1.35;
  color: var(--ink-faint);
}
.mode input:checked + .mode__box { border-color: var(--signal); background: var(--paper); }
.mode input:checked + .mode__box b { color: var(--signal); }
.mode input:focus-visible + .mode__box { outline: 2px solid var(--signal); outline-offset: 2px; }
.mode input:disabled + .mode__box { opacity: 0.42; cursor: not-allowed; }

.field { margin-top: var(--s5); }
.field__row { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s3); }
.field__label {
  font-family: var(--font-display);
  font-size: 11px; font-stretch: 85%;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint);
}
.field__value { font-size: 26px; font-weight: 600; line-height: 1; color: var(--signal); }
.field__ends {
  display: flex; justify-content: space-between;
  font-size: 10.5px; color: var(--ink-faint); margin-top: 6px;
}
.field__hint { margin: var(--s2) 0 0; font-size: 12px; color: var(--ink-faint); }
.field__combo { display: flex; gap: var(--s2); margin-top: var(--s2); flex-wrap: wrap; }

input[type="number"] {
  flex: 1 1 120px; min-width: 0;
  background: var(--paper);
  border: 1.5px solid var(--rule);
  border-radius: var(--edge);
  color: var(--ink);
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  padding: 8px 10px;
}
input[type="number"]:focus { border-color: var(--signal); outline: none; }

.units { display: flex; gap: 0; }
.unit { position: relative; }
.unit input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.unit span {
  display: block;
  border: 1.5px solid var(--rule);
  padding: 9px 13px;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
}
.unit:first-child span { border-radius: var(--edge) 0 0 var(--edge); }
.unit:last-child span { border-left-width: 0; border-radius: 0 var(--edge) var(--edge) 0; }
.unit input:checked + span { background: var(--ink); border-color: var(--ink); color: var(--paper-hi); }
.unit input:focus-visible + span { outline: 2px solid var(--signal); outline-offset: 2px; }

/* range */
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; margin: var(--s3) 0 0;
  background: transparent; cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px; background: var(--rule); border-radius: 0;
}
input[type="range"]::-moz-range-track { height: 4px; background: var(--rule); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 6px; height: 26px; margin-top: -11px;
  background: var(--signal); border: 0; border-radius: 1px;
}
input[type="range"]::-moz-range-thumb {
  width: 6px; height: 26px;
  background: var(--signal); border: 0; border-radius: 1px;
}
input[type="range"]:disabled { cursor: not-allowed; }
input[type="range"]:disabled::-webkit-slider-thumb { background: var(--ink-faint); }
input[type="range"]:disabled::-moz-range-thumb { background: var(--ink-faint); }

.go {
  display: block; width: 100%;
  margin-top: var(--s6);
  background: var(--signal);
  color: #fff;
  border: 0; border-radius: var(--edge);
  padding: var(--s4);
  font-family: var(--font-display);
  font-size: 16px; font-weight: 700; font-stretch: 90%;
  letter-spacing: 0.11em; text-transform: uppercase;
  cursor: pointer;
  transition: filter 0.12s;
}
.go:hover:not(:disabled) { filter: brightness(1.1); }
.go:disabled { background: var(--rule); color: var(--ink-faint); cursor: not-allowed; }

/* -------------------------------------------------------------- notices -- */

.notice {
  margin: var(--s4) 0 0;
  padding: var(--s3);
  border-left: 3px solid var(--rule);
  background: var(--paper);
  font-size: 13px;
  line-height: 1.45;
}
.notice--error { border-left-color: var(--signal); color: var(--ink); }
.notice--warn { border-left-color: var(--trace); }
.notices:empty { display: none; }
.notices { margin-top: var(--s4); display: grid; gap: var(--s2); }

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

.progress__bar {
  height: 10px;
  background: var(--paper);
  border: var(--line);
  overflow: hidden;
}
.progress__fill {
  height: 100%; width: 0;
  background: var(--signal);
  transition: width 0.28s ease-out;
}
.progress__meta {
  display: flex; justify-content: space-between; gap: var(--s3);
  margin-top: var(--s2);
  font-size: 13px; color: var(--ink-soft);
}

/* ---------------------------------------------- the ruler (signature) ----- */

.result__head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: var(--s3); flex-wrap: wrap;
}
.result__head .panel__label { margin-bottom: var(--s4); flex: 1 1 140px; }
.result__verdict {
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700; line-height: 1;
  color: var(--signal);
  letter-spacing: -0.02em;
}
.result__verdict.is-flat { color: var(--ink-soft); }

.ruler {
  margin: 0;
  padding: var(--s5) 0 var(--s4);
  border-top: var(--line);
  border-bottom: var(--line);
  display: grid;
  gap: var(--s4);
}
.ruler__row, .ruler__probes {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 92px;
  align-items: center;
  gap: var(--s3);
}
.ruler__key {
  font-family: var(--font-display);
  font-size: 10.5px; font-stretch: 85%;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint);
}
.ruler__track {
  position: relative;
  height: 22px;
  background: var(--paper);
  border: var(--line);
}
.ruler__bar {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 0;
  transition: width 0.5s cubic-bezier(0.2, 0.8, 0.3, 1);
}
.ruler__bar--before { background: var(--ink); }
.ruler__bar--after { background: var(--signal); }
.ruler__num { font-size: 13px; text-align: right; }

.ruler__target {
  position: absolute; top: -6px; bottom: -6px;
  width: 2px;
  background: var(--trace);
}
.ruler__target span {
  position: absolute; top: -14px; left: 50%;
  transform: translateX(-50%);
  font-size: 9.5px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--trace);
  white-space: nowrap;
}
.ruler__probes .ruler__track { height: 30px; background: transparent; border: 0; border-top: var(--line); }

.ruler__legend {
  margin: 0;
  padding-left: calc(62px + var(--s3));
  font-size: 11.5px;
  color: var(--ink-faint);
}
.ruler__legend b { font-weight: 600; }
.ruler__legend .is-over { color: var(--trace); }
.ruler__legend .is-under { color: var(--ink-soft); }
.ruler__legend .is-kept { color: var(--signal); }

/* Attempts that fit under the target, attempts that overshot, and the winner. */
.probe {
  position: absolute; top: 6px;
  width: 2px; height: 11px;
  background: var(--ink-soft);
  transform: translateX(-1px);
  opacity: 0;
  z-index: 1;
  animation: probe-in 0.3s ease-out forwards;
}
.probe--over { background: var(--trace); height: 8px; }
/* The winner lands just under the target by definition, so it sits on top of
   the target line — the halo keeps it readable where the two coincide. */
.probe--kept {
  background: var(--signal);
  height: 21px; width: 3px; top: 1px;
  z-index: 2;
  box-shadow: 0 0 0 1.5px var(--paper-hi);
}

.probe-target {
  position: absolute; top: 0; bottom: 8px;
  width: 0; left: 0;
  border-left: 1.5px dashed var(--trace);
  transform: translateX(-1px);
  z-index: 0;
}
.probe__tag {
  position: absolute; top: 14px; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-num);
  font-size: 9px; color: var(--ink-faint);
}
.probe--kept .probe__tag { color: var(--signal); top: 22px; }

@keyframes probe-in { from { opacity: 0; transform: translateX(-1px) scaleY(0.2); } to { opacity: 1; } }

/* ---------------------------------------------------- result body/preview - */

.result__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s5);
  margin-top: var(--s5);
}
.preview { min-width: 0; }
.preview img, .preview video {
  display: block; max-width: 100%; max-height: 340px;
  border: var(--line); background: var(--paper-lo);
}
.preview audio { width: 100%; }
.preview iframe {
  width: 100%; height: 340px; border: var(--line); background: var(--paper-lo);
}
.preview pre {
  margin: 0; max-height: 340px; overflow: auto;
  border: var(--line); background: var(--paper);
  padding: var(--s3);
  font-family: var(--font-num); font-size: 12px; line-height: 1.5;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.preview__none {
  border: 1.5px dashed var(--rule);
  padding: var(--s6) var(--s4);
  text-align: center;
  color: var(--ink-faint);
  font-size: 13px;
}
.result__side { min-width: 0; display: flex; flex-direction: column; gap: var(--s4); }
.result__side .facts { margin-top: 0; border-top: 0; padding-top: 0; }

.download {
  display: block;
  margin-top: auto;
  background: var(--ink);
  color: var(--paper-hi);
  text-align: center;
  text-decoration: none;
  padding: var(--s4);
  border-radius: var(--edge);
  font-family: var(--font-display);
  font-size: 16px; font-weight: 700; font-stretch: 90%;
  letter-spacing: 0.11em; text-transform: uppercase;
}
.download:hover { background: var(--signal); color: #fff; }

/* ------------------------------------------------------------- colophon -- */

.colophon {
  margin-top: var(--s6);
  padding-top: var(--s4);
  border-top: var(--line);
  color: var(--ink-faint);
  font-size: 12px;
}
.colophon p { margin: 0; max-width: 62ch; }

/* ------------------------------------------------------------ responsive -- */

@media (min-width: 700px) {
  .drop__kinds { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .result__body { grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); }
}

@media (min-width: 1000px) {
  .shell { padding: var(--s6) var(--s6) var(--s8); }
  .stage { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .panel--progress, .panel--result { grid-column: 1 / -1; }
  .drop__kinds { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 460px) {
  body { background-image: none; }
  .panel { padding: var(--s4); }
  .modes { grid-template-columns: 1fr; }
  .drop__inner { padding: var(--s6) var(--s4); }
  .ruler__row, .ruler__probes { grid-template-columns: 52px minmax(0, 1fr); }
  .ruler__num { grid-column: 2; text-align: left; margin-top: -6px; }
  .ruler__legend { padding-left: 0; }
  .readouts { gap: var(--s4); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .probe { opacity: 1; }
}