/* Overprint — press-room chrome. Deliberately achromatic: the only saturated
   colour in the interface is the ink each channel actually prints with. */

:root {
  --bed:    #131514;
  --panel:  #1b1e1d;
  --sunk:   #141716;
  --line:   #2b2f2e;
  --edge:   #3b413f;
  --text:   #e9e7e1;
  --dim:    #939894;
  --dimmer: #6a706d;
  --focus:  #d8d4c8;
  --rail-w: 348px;
  --bar-h:  52px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bed);
  color: var(--text);
  font-family: 'Archivo', 'Helvetica Neue', system-ui, sans-serif;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; color: inherit; font-variant-numeric: tabular-nums; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 3px; }

/* ── top bar ─────────────────────────────────────────────────────────── */

.bar {
  height: var(--bar-h);
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.mark {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.02em;
  padding-right: 4px;
}
.mark svg { display: block; }

.seg {
  display: flex;
  background: var(--sunk);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 2px;
}
.seg button {
  border: 0;
  background: none;
  padding: 5px 11px;
  border-radius: 5px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--dim);
  cursor: pointer;
  white-space: nowrap;
}
.seg button:hover { color: var(--text); }
.seg button.on { background: #30352f; color: var(--text); }

.bar-end { margin-left: auto; display: flex; gap: 8px; }

.btn {
  border: 1px solid var(--edge);
  background: #232725;
  padding: 6px 13px;
  border-radius: 7px;
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
}
.btn:hover { background: #2c312e; }
.btn:active { transform: translateY(0.5px); }
.btn.primary { background: var(--text); color: #161a18; border-color: var(--text); font-weight: 600; }
.btn.primary:hover { background: #fff; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── layout ──────────────────────────────────────────────────────────── */

main {
  display: grid;
  grid-template-columns: 1fr var(--rail-w);
  height: calc(100% - var(--bar-h));
}

.bed {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bed);
  transition: background 180ms ease;
}
.bed[data-bg="gray"]  { background: #7d7d7a; }   /* ISO 3664 neutral viewing surround */
.bed[data-bg="white"] { background: #eceae4; }

.stage {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 28px;
  min-height: 0;
  overflow: hidden;
}

#view {
  display: block;
  max-width: 100%;
  max-height: 100%;
  box-shadow: 0 1px 2px rgba(0,0,0,.30), 0 18px 46px rgba(0,0,0,.42);
  cursor: grab;
  touch-action: none;
}
#view.dragging { cursor: grabbing; }
#view.hidden { display: none; }

.bed-foot {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  height: 30px;
  font-size: 11.5px;
  color: var(--dimmer);
  border-top: 1px solid rgba(255,255,255,.05);
  background: rgba(0,0,0,.18);
}
.bed-foot .grow { flex: 1; }

.surround { display: flex; gap: 4px; }
.surround button {
  width: 15px; height: 15px; padding: 0;
  border-radius: 4px; cursor: pointer;
  border: 1px solid var(--edge);
}
.surround button[data-bg="dark"]  { background: #131514; }
.surround button[data-bg="gray"]  { background: #7d7d7a; }
.surround button[data-bg="white"] { background: #eceae4; }
.surround button.on { box-shadow: 0 0 0 2px var(--text); }

/* ── empty state ─────────────────────────────────────────────────────── */

.empty {
  position: absolute;
  inset: 0 0 30px 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 4px;
  text-align: center;
  padding: 24px;
  pointer-events: none;
}
.empty > * { pointer-events: auto; }
.empty[hidden] { display: none; }   /* class display beats the UA [hidden] rule */
.empty-lead { margin: 0; font-size: 21px; font-weight: 600; letter-spacing: -0.02em; }
.empty-sub  { margin: 0 0 16px; font-size: 13px; color: var(--dim); max-width: 42ch; line-height: 1.5; }
.empty-acts { display: flex; gap: 9px; }

.bed.drop::after {
  content: '';
  position: absolute;
  inset: 12px;
  border: 2px dashed var(--edge);
  border-radius: 10px;
  pointer-events: none;
}

/* ── rail ────────────────────────────────────────────────────────────── */

.rail {
  background: var(--panel);
  border-left: 1px solid var(--line);
  min-height: 0;
  display: flex;
}
.rail-scroll { flex: 1; overflow-y: auto; overscroll-behavior: contain; }
.rail-scroll::-webkit-scrollbar { width: 10px; }
.rail-scroll::-webkit-scrollbar-thumb { background: #323735; border-radius: 6px; border: 3px solid var(--panel); }

.sect { border-bottom: 1px solid var(--line); }
.sect > summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 14px;
  cursor: pointer;
  font-weight: 600;
  font-size: 12.5px;
  list-style: none;
  user-select: none;
}
.sect > summary::-webkit-details-marker { display: none; }
.sect > summary::before {
  content: '';
  width: 5px; height: 5px;
  border-right: 1.5px solid var(--dimmer);
  border-bottom: 1.5px solid var(--dimmer);
  transform: rotate(-45deg);
  transition: transform 140ms ease;
  margin-right: 2px;
}
.sect[open] > summary::before { transform: rotate(45deg); }
.sect > summary .note { margin-left: auto; color: var(--dimmer); font-weight: 400; font-size: 11.5px; }
.sect-body { padding: 2px 14px 15px; }

/* ── controls ────────────────────────────────────────────────────────── */

.row { margin: 9px 0; }
.row-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 12px;
  color: var(--dim);
}
.row-head .val { margin-left: auto; color: var(--text); font-weight: 500; }

input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 16px;
  background: none;
  cursor: pointer;
  display: block;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 3px; border-radius: 2px;
  background: var(--sunk);
  border: 1px solid var(--line);
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  margin-top: -6px;
  border-radius: 50%;
  background: var(--text);
  border: 0;
}
input[type=range]::-moz-range-track { height: 3px; border-radius: 2px; background: var(--sunk); border: 1px solid var(--line); }
input[type=range]::-moz-range-thumb { width: 13px; height: 13px; border: 0; border-radius: 50%; background: var(--text); }

.chips { display: flex; flex-wrap: wrap; gap: 5px; margin: 8px 0 2px; }
.chip {
  border: 1px solid var(--line);
  background: var(--sunk);
  border-radius: 6px;
  padding: 5px 9px;
  font-size: 12px;
  color: var(--dim);
  cursor: pointer;
}
.chip:hover { color: var(--text); border-color: var(--edge); }
.chip.on { background: #30352f; color: var(--text); border-color: var(--edge); }

.papers { display: flex; gap: 6px; margin: 9px 0 3px; }
.paper-sw {
  flex: 1;
  height: 34px;
  border-radius: 5px;
  border: 1px solid var(--edge);
  cursor: pointer;
  padding: 0;
}
.paper-sw.on { box-shadow: 0 0 0 2px var(--text); }

.hint { font-size: 11.5px; color: var(--dimmer); line-height: 1.5; margin: 8px 0 0; }

/* ── ink channel module ──────────────────────────────────────────────── */

.ink {
  border: 1px solid var(--line);
  border-radius: 9px;
  margin: 10px 0;
  overflow: hidden;
  background: var(--sunk);
}
.ink-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  /* tinted by the ink itself, set inline */
}
.ink-drum {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid #cfccc4;                    /* the ink sits on paper, so dark inks read */
  box-shadow: 0 0 0 1px #0e100f, inset 0 0 0 2px rgba(0,0,0,.18);
  cursor: pointer;
  padding: 0;
  flex: none;
}
.ink-name { font-weight: 600; font-size: 12.5px; cursor: pointer; background: none; border: 0; padding: 0; text-align: left; }
.ink-name:hover { text-decoration: underline; }
.ink-body { padding: 4px 10px 11px; }

.dial-row { display: flex; gap: 12px; align-items: center; margin: 9px 0 4px; }
.dial {
  width: 52px; height: 52px;
  flex: none;
  border-radius: 50%;
  background: #0e100f;
  border: 1px solid var(--edge);
  cursor: grab;
  touch-action: none;
}
.dial:active { cursor: grabbing; }
.dial-meta { flex: 1; min-width: 0; }

.popover {
  position: fixed;
  z-index: 50;
  background: #232725;
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: 9px;
  box-shadow: 0 14px 44px rgba(0,0,0,.55);
  width: 246px;
  max-height: 60vh;
  overflow-y: auto;
}
.pop-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 5px; }
.pop-sw {
  aspect-ratio: 1;
  border-radius: 5px;
  border: 1px solid rgba(255,255,255,.18);
  cursor: pointer;
  padding: 0;
  outline-offset: 1px;
}
.pop-sw.on { box-shadow: 0 0 0 2px var(--text); }
.pop-name { font-size: 11.5px; color: var(--dim); height: 15px; margin: 7px 2px 0; }

.toast {
  position: fixed;
  left: 50%; bottom: 26px;
  transform: translateX(-50%);
  background: var(--text);
  color: #161a18;
  font-weight: 600;
  font-size: 12.5px;
  padding: 8px 15px;
  border-radius: 8px;
  z-index: 60;
  box-shadow: 0 10px 30px rgba(0,0,0,.5);
}

.busy { position: fixed; inset: 0; display: grid; place-items: center; background: rgba(0,0,0,.55); z-index: 55; font-weight: 600; }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; grid-template-rows: minmax(220px, 1fr) auto; }
  .rail { border-left: 0; border-top: 1px solid var(--line); max-height: 46vh; }
  .bar { flex-wrap: wrap; height: auto; padding: 8px 12px; gap: 10px; }
  .views { order: 3; width: 100%; overflow-x: auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}