Blame for static/style.css

/* specimg slip — mobile only (iPhone / iPad). A white paper receipt on a dark
   desk. Always "paper": does not follow device light/dark theme. */

:root {
  --paper: #fbfbf7;
  --ink: #111;
  --ink-soft: #555;
  --desk: #2a2a2d;
  --slip-width: 384px;        /* matches native freq-axis feel; scales down on small phones */
  --mono: "SFMono-Regular", ui-monospace, "Menlo", "Consolas", monospace;
}

* { box-sizing: border-box; }

/* links to the other tool pages */
.jump {
  position: fixed;
  top: calc(env(safe-area-inset-top) + 8px);
  right: 12px;
  display: flex;
  gap: 8px;
  z-index: 5;
}
.jump a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #eee;
  text-decoration: none;
  background: rgba(0, 0, 0, 0.4);
  padding: 6px 10px;
  border-radius: 8px;
}

/* Make the `hidden` attribute win over our display:flex/grid rules. */
[hidden] { display: none !important; }

/* quality selector (on the desk, above the slip) */
.quality {
  width: 100%;
  max-width: var(--slip-width);
  margin: 52px auto 0;
  display: flex;
  align-items: center;
  gap: 8px;
}
.quality label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: #bbb;
}
.quality select {
  flex: 1;
  appearance: none;
  font-family: var(--mono);
  font-size: 13px;
  color: #eee;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid #444;
  border-radius: 8px;
  padding: 8px 10px;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--desk);
  color: var(--ink);
  font-family: var(--mono);
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: env(safe-area-inset-top) 12px calc(env(safe-area-inset-bottom) + 24px);
  min-height: 100vh;
}

/* ---- the slip ---------------------------------------------------------- */
.slip {
  width: 100%;
  max-width: var(--slip-width);
  background: var(--paper);
  color: var(--ink);
  margin-top: 16px;
  padding: 0;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

/* zig-zag tear edges */
.tear {
  height: 10px;
  background-size: 16px 16px;
}
.tear--top {
  background:
    linear-gradient(135deg, var(--paper) 50%, transparent 0) 0 0 / 16px 16px,
    linear-gradient(-135deg, var(--paper) 50%, transparent 0) 0 0 / 16px 16px;
  background-color: transparent;
  transform: translateY(-9px);
}
.tear--bottom {
  background:
    linear-gradient(45deg, var(--paper) 50%, transparent 0) 0 0 / 16px 16px,
    linear-gradient(-45deg, var(--paper) 50%, transparent 0) 0 0 / 16px 16px;
  background-color: transparent;
  transform: translateY(9px);
}

.slip__head { padding: 14px 18px 0; }

.slip__title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  text-transform: uppercase;
  line-height: 1.2;
  outline: none;
  word-break: break-word;
  min-height: 1.2em;
}
.slip__title:empty::before {
  content: attr(data-placeholder);
  color: #bbb;
  font-weight: 400;
}
.slip__title:focus { background: rgba(0, 0, 0, 0.04); }

.slip__meta {
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  margin-top: 6px;
}

.rule {
  border-top: 1px dashed #000;
  margin: 12px 0;
  opacity: 0.6;
}

/* ---- body -------------------------------------------------------------- */
.slip__body { padding: 0 18px; }

.dropzone {
  width: 100%;
  appearance: none;
  background: transparent;
  border: 2px dashed #999;
  color: var(--ink-soft);
  font-family: var(--mono);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 48px 16px;
  cursor: pointer;
}
.dropzone:active { background: rgba(0, 0, 0, 0.04); }
.dropzone__plus { font-size: 40px; line-height: 1; }
.dropzone__label { font-size: 14px; letter-spacing: 0.1em; font-weight: 700; }
.dropzone__hint { font-size: 11px; letter-spacing: 0.08em; opacity: 0.7; }

.spectro { margin: 0; }
.spectro__img {
  display: block;
  width: 100%;
  height: auto;
  /* crisp pixels: this is numeric data, not a photo */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

/* ---- status / spinner -------------------------------------------------- */
.status {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 48px 16px;
}
.spinner {
  width: 34px;
  height: 34px;
  border: 3px solid rgba(0, 0, 0, 0.15);
  border-top-color: var(--ink);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.status__text {
  font-size: 13px;
  letter-spacing: 0.18em;
}
.status.is-error .spinner { display: none; }
.status.is-error .status__text { color: #b00020; }

/* ---- footer ------------------------------------------------------------ */
.slip__foot { padding: 0 18px 16px; }
.totals {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.totals__row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
}
.totals__row span:last-child { font-weight: 700; }
.slip__thanks {
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.14em;
  margin-top: 14px;
  color: var(--ink-soft);
}

/* Controls live on the "desk", not on the paper slip. */
.controls {
  width: 100%;
  max-width: var(--slip-width);
  margin: 20px auto 0;
}
.print-btn {
  width: 100%;
  padding: 16px;
  appearance: none;
  background: #f4f4f4;
  color: #111;
  border: none;
  border-radius: 10px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.2em;
  cursor: pointer;
}
.print-btn:active { opacity: 0.85; }