/*
 * Handover — shared visual system.
 *
 * One rule governs everything here: the ink never changes, only the
 * stock. The operator console and the client's panel are the same
 * document printed on different paper, which is why there is a single
 * set of ink roles and two stock definitions rather than two themes.
 *
 * The stock is chosen from the physical scene, never from taste:
 *
 *   carbon — the operator spends an hour staring at a bright rectangle
 *            that is someone else's screen. Everything around it must
 *            be dark and matte, or it competes with the only thing
 *            they are actually reading.
 *
 *   paper  — the client glances at a corner of their own screen every
 *            few minutes, eyes adapted to their own bright documents,
 *            to confirm that what they allowed is still what is
 *            happening. It has to read instantly and must not look
 *            like a system error.
 */

/* ------------------------------------------------------------------ *
 * Stocks
 * ------------------------------------------------------------------ */

:root,
[data-stock='paper'] {
  --stock: #f4f1ea;
  --stock-sunk: #eae6dc;
  --stock-raised: #fffefb;

  --ink-strong: #17150f;
  --ink: #35322a;
  --ink-muted: #5f5a4e;
  --ink-faint: #8d8879;

  --rule: #d9d3c5;
  --rule-strong: #bdb6a5;

  --seal: #a8321e;

  --field: #fffefb;
  --field-border: #c6c0b0;
}

[data-stock='carbon'] {
  --stock: #14130f;
  --stock-sunk: #0d0c09;
  --stock-raised: #1d1c16;

  --ink-strong: #efeadc;
  --ink: #c7c1b0;
  --ink-muted: #948e7c;
  --ink-faint: #6b6659;

  --rule: #2c2a23;
  --rule-strong: #423f35;

  /* Ink transfers lighter onto carbon than it prints on the original.
     Same pigment, different stock — and it clears 4.5:1 here too. */
  --seal: #e2664a;

  --field: #100f0c;
  --field-border: #3a372e;
}

/* ------------------------------------------------------------------ *
 * Type
 * ------------------------------------------------------------------ */

:root {
  --face-ui: 'Golos Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --face-data: 'PT Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* Fixed steps, not fluid. A clamped heading that shrinks inside a
     narrow panel looks worse than one that simply reflows. */
  --t-micro: 0.6875rem;
  --t-small: 0.8125rem;
  --t-base: 0.9375rem;
  --t-lead: 1.0625rem;
  --t-title: 1.375rem;

  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;

  --radius: 3px;

  /* Sheet feed, not choreography: linear, brief, and only ever used to
     show that something changed state. */
  --move: 150ms linear;
}

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

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

body {
  margin: 0;
  background: var(--stock);
  color: var(--ink);
  font-family: var(--face-ui);
  font-size: var(--t-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Every digit that ticks lives in a fixed cell, so a running timer or a
   changing latency never nudges what sits beside it. */
.data,
.num {
  font-family: var(--face-data);
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum' 1;
}

.label {
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 500;
}

h1, h2, h3 {
  margin: 0;
  color: var(--ink-strong);
  font-weight: 600;
  line-height: 1.25;
  text-wrap: balance;
}

h1 { font-size: var(--t-title); }
h2 { font-size: var(--t-lead); }
h3 { font-size: var(--t-base); }

p { margin: 0 0 var(--sp-3); max-width: 68ch; }
p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------------ *
 * Browser surfaces
 *
 * The parts nobody draws still belong to the design. Left at their
 * defaults they announce that a page was assembled rather than built.
 * ------------------------------------------------------------------ */

::selection {
  background: var(--seal);
  color: var(--stock);
}

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

:where(input, textarea) {
  caret-color: var(--seal);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--rule-strong);
  border: 3px solid var(--stock);
  border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover { background: var(--ink-faint); }

/* ------------------------------------------------------------------ *
 * Controls
 *
 * One button family across both surfaces. The client's giant "end it"
 * control and the operator's toolbar buttons are the same component at
 * different scales — a support tool where the same action looks
 * different in two places is a tool people misread under stress.
 * ------------------------------------------------------------------ */

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--field-border);
  border-radius: var(--radius);
  background: var(--field);
  color: var(--ink-strong);
  font: inherit;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  transition: background var(--move), border-color var(--move), color var(--move);
}

.btn:hover:not(:disabled) { border-color: var(--ink-faint); }
.btn:active:not(:disabled) { background: var(--stock-sunk); }

.btn:disabled {
  cursor: not-allowed;
  /* Genuinely desaturated, not merely dimmed: an unavailable control
     should look unavailable, not look like it is loading. */
  filter: grayscale(1);
  opacity: 0.45;
}

.btn-primary {
  background: var(--ink-strong);
  border-color: var(--ink-strong);
  color: var(--stock);
}
.btn-primary:hover:not(:disabled) { background: var(--ink); border-color: var(--ink); }
.btn-primary:active:not(:disabled) { background: var(--ink); }

/*
 * Seal red is reserved, by law, for one meaning: control of this
 * machine is currently released to someone else. It marks the live
 * session, the frame around the screen, and the control that ends it.
 * It is never an error colour, never a hover, never decoration.
 */
.btn-seal {
  background: var(--seal);
  border-color: var(--seal);
  color: #fff;
}
.btn-seal:hover:not(:disabled) { filter: brightness(1.08); }

.btn-lg {
  padding: 0.8125rem 1.25rem;
  font-size: var(--t-lead);
}

.btn-quiet {
  background: transparent;
  border-color: transparent;
  color: var(--ink-muted);
}
.btn-quiet:hover:not(:disabled) {
  background: var(--stock-sunk);
  border-color: transparent;
  color: var(--ink-strong);
}

.input {
  width: 100%;
  padding: 0.5rem 0.625rem;
  border: 1px solid var(--field-border);
  border-radius: var(--radius);
  background: var(--field);
  color: var(--ink-strong);
  font: inherit;
  transition: border-color var(--move);
}

.input:hover { border-color: var(--ink-faint); }
.input:focus { border-color: var(--seal); outline-offset: 1px; }
.input::placeholder { color: var(--ink-faint); }

/* ------------------------------------------------------------------ *
 * Ruled fields
 *
 * The structural motif: a printed label above a hairline, with the
 * value sitting in the field below it. It replaces the card, which is
 * why nothing in this system needs a box or a shadow to hold together.
 * ------------------------------------------------------------------ */

.field-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-block: 0.4375rem;
  border-bottom: 1px solid var(--rule);
}

.field-row:last-child { border-bottom: 0; }

.field-row dt {
  margin: 0;
  font-size: var(--t-small);
  color: var(--ink-muted);
}

.field-row dd {
  margin: 0;
  color: var(--ink-strong);
  text-align: right;
}

/* ------------------------------------------------------------------ *
 * State vocabulary
 *
 * Three states, rendered identically on both surfaces, always with the
 * measured value beside the name.
 *
 * Each one differs in shape as well as weight, because a set of dots
 * that differ only in colour is unreadable to anyone who cannot
 * separate those colours — and because "settled" and "still working on
 * it" must not look alike. Seal red is absent here on purpose: it means
 * one thing only, and it is not "connection quality".
 * ------------------------------------------------------------------ */

.state {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--t-small);
  color: var(--ink-muted);
}

.state::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

/* Settled and good: a solid mark. */
.state-ok { color: var(--ink); }

/* Not resolved yet: hollow, because nothing has been decided. */
.state-idle { color: var(--ink-faint); }
.state-idle::before {
  background: transparent;
  box-shadow: inset 0 0 0 1.5px currentColor;
}

/* Degraded or lost: a different shape entirely, at full ink weight. */
.state-warn { color: var(--ink-strong); }
.state-warn::before {
  border-radius: 0;
  width: 7px;
  height: 7px;
  transform: rotate(45deg);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ------------------------------------------------------------------ *
 * hidden
 *
 * Both renderers hide things by setting the `hidden` attribute from
 * JavaScript, and trust it to work. It does not: `hidden` is styled by
 * the browser's own stylesheet, which every author rule outranks. One
 * `display` on a class — `.state` here, `.notice:has(.btn)` in the
 * panel — is enough to pin an element open forever, and the symptom is
 * never a visible error. It is a warning that will not go away no
 * matter what the code does, and hours spent looking for the condition
 * that sets it, because there is no such condition.
 *
 * This has already happened twice, in two different files. So the rule
 * lives here, once, and outranks whatever comes after it.
 * ------------------------------------------------------------------ */
[hidden] { display: none !important; }