/* Graphite and signal orange: the palette of a machine that stops when a person
   has to decide. Orange means exactly one thing here — waiting on a human — and
   is used nowhere else, so the page can be read at a glance from across a desk. */

:root {
  --ground:        #f4f3f0;
  --panel:         #ffffff;
  --panel-edge:    #dedcd6;
  --ink:           #16191c;
  --ink-soft:      #5c6268;
  --ink-faint:     #8d9298;
  --signal:        #d2551b;   /* stopped, waiting for a person */
  --signal-soft:   #fbe9dd;
  --running:       #2b6f6a;   /* the machine is moving */
  --running-soft:  #e0eeec;
  --done:          #3d6b2f;
  --on-done:       #ffffff;
  --refused:       #9a2f2f;
  --rule:          #e6e4de;
  --trace-ground:  #1b1f23;
  --trace-ink:     #c9cdd2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground:       #101315;
    --panel:        #181c1f;
    --panel-edge:   #2a2f34;
    --ink:          #e6e8ea;
    --ink-soft:     #a0a6ac;
    --ink-faint:    #6f767d;
    --signal:       #f0803f;
    --signal-soft:  #3a2317;
    --running:      #5aada6;
    --running-soft: #16302e;
    --done:         #7bb063;
    --on-done:      #0e1a09;
    --refused:      #d97070;
    --rule:         #24292e;
    --trace-ground: #0b0e10;
    --trace-ink:    #b9bfc5;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 16px/1.55 "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

code, pre, .mono { font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace; }

/* -- frame ---------------------------------------------------------------- */

header.top {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1.1rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--rule);
  background: var(--panel);
}

header.top .wordmark {
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-right: auto;
}

header.top .wordmark span { color: var(--ink-faint); font-weight: 400; }

header.top nav { display: flex; gap: 1.25rem; }

header.top a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.9rem;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

header.top a:hover { color: var(--ink); }
header.top a[aria-current] { color: var(--ink); border-bottom-color: var(--signal); }

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(1.25rem, 4vw, 2.5rem);
}

h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0 0 0.4rem;
}

.lede {
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 2rem;
}

.lede a { color: inherit; }

/* -- the two panes -------------------------------------------------------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 26rem);
  gap: 1.75rem;
  align-items: start;
}

@media (max-width: 62rem) {
  .split { grid-template-columns: minmax(0, 1fr); }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 3px;
  padding: 1.25rem;
}

.panel h2 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-faint);
  margin: 0 0 1rem;
  font-weight: 600;
}

/* -- conversation --------------------------------------------------------- */

.thread { display: flex; flex-direction: column; gap: 0.9rem; }

.turn { display: flex; flex-direction: column; gap: 0.3rem; max-width: 46ch; }
.turn.mine { align-self: flex-end; align-items: flex-end; }

.turn .who {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.turn .said {
  background: var(--ground);
  border: 1px solid var(--panel-edge);
  border-radius: 3px;
  padding: 0.6rem 0.8rem;
}

.turn.mine .said { background: var(--running-soft); border-color: transparent; }
.turn.system .said { background: transparent; border: 0; padding: 0.2rem 0; color: var(--ink-soft); }

/* A stop is not a remark, so it does not sit in a speech bubble's width: the
   choice is the widest thing on the page because it is the thing to act on. */
.turn.stopped { max-width: none; align-self: stretch; }

.turn.stopped .said {
  background: var(--signal-soft);
  border-color: transparent;
  border-left: 3px solid var(--signal);
}

.turn.stopped .said a { color: var(--signal); }

/* -- choices -------------------------------------------------------------- */

.options { display: flex; flex-direction: column; gap: 0.6rem; margin-top: 0.5rem; }

.option {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem 1rem;
  align-items: center;
  width: 100%;
  text-align: left;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 3px;
  padding: 0.75rem 0.9rem;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.option:hover:not(:disabled) { border-color: var(--running); }
.option:disabled { opacity: 0.5; cursor: default; }
.option .name { font-weight: 600; }
.option .why { grid-column: 1 / -1; font-size: 0.86rem; color: var(--ink-soft); }
.option .figures { font-variant-numeric: tabular-nums; font-size: 0.9rem; text-align: right; }
.option .figures b { display: block; font-weight: 600; }
.option .figures span { color: var(--ink-faint); }

.option.recommended { border-color: var(--running); box-shadow: inset 3px 0 0 var(--running); }
.option .tag {
  grid-column: 1 / -1;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--running);
}

/* -- composer ------------------------------------------------------------- */

form.composer { display: flex; gap: 0.6rem; margin-top: 1.25rem; }

form.composer input {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--panel-edge);
  border-radius: 3px;
  background: var(--panel);
  color: var(--ink);
}

form.composer input:focus-visible,
button:focus-visible,
a:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

button.go {
  font: inherit;
  font-weight: 600;
  padding: 0.65rem 1.1rem;
  border: 0;
  border-radius: 3px;
  background: var(--ink);
  color: var(--ground);
  cursor: pointer;
}

button.go:disabled { opacity: 0.4; cursor: default; }

.suggestions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.7rem; }

.suggestions button {
  font: inherit;
  font-size: 0.84rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px dashed var(--panel-edge);
  border-radius: 3px;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}

.suggestions button:hover { color: var(--ink); border-style: solid; }

/* -- the trace ------------------------------------------------------------ */

/* Deliberately dark in both themes: this is a terminal surface, not part of the
   page's ground, which is why the greys on it are fixed rather than tokens. */
.trace {
  background: var(--trace-ground);
  color: var(--trace-ink);
  border-radius: 3px;
  padding: 0.9rem;
  font-size: 0.78rem;
  line-height: 1.7;
  max-height: 30rem;
  overflow: auto;
}

.trace .row { display: grid; grid-template-columns: 2.2rem 8.5rem 1fr; gap: 0.5rem; }
.trace .seq { color: #5b6167; font-variant-numeric: tabular-nums; text-align: right; }
.trace .kind.quiet { color: #767c83; }
.trace .kind.running { color: #6fb3ac; }
.trace .kind.stopped { color: var(--signal); }
.trace .step { color: #e8ebee; }
.trace .note { color: #8d9298; }
.trace .empty { color: #767c83; }

.about {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 1rem;
  margin: 1rem 0 0;
  font-size: 0.78rem;
}

.about[hidden] { display: none; }
.about dt { color: var(--ink-faint); }
.about dd { margin: 0; word-break: break-all; }

/* -- approvals ------------------------------------------------------------ */

.inbox {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  /* Decisions read better in a column than across a wide page: the eye should
     land on the amount without travelling. */
  max-width: 44rem;
}

.request {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-left: 3px solid var(--signal);
  border-radius: 3px;
  padding: 1.1rem 1.25rem;
}

.request h3 { margin: 0 0 0.15rem; font-size: 1.05rem; }
.request .ref { font-size: 0.78rem; color: var(--ink-faint); }

.request dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1.25rem;
  margin: 0.9rem 0 1.1rem;
  font-size: 0.92rem;
}

.request dt { color: var(--ink-soft); }
.request dd { margin: 0; font-variant-numeric: tabular-nums; }
.request dd.over { color: var(--refused); }

.decide { display: flex; gap: 0.6rem; }

.decide button {
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.45rem 1rem;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid var(--panel-edge);
  background: var(--panel);
  color: var(--ink);
}

.decide button.approve { background: var(--done); border-color: transparent; color: var(--on-done); }
.decide button.reject:hover { border-color: var(--refused); color: var(--refused); }
.decide button:disabled { opacity: 0.4; cursor: default; }

.quiet-inbox {
  border: 1px dashed var(--panel-edge);
  border-radius: 3px;
  padding: 2.5rem 1.25rem;
  text-align: center;
  color: var(--ink-faint);
}

.quiet-inbox a { color: var(--ink-soft); }

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

.group { margin-bottom: 2.75rem; }
.group h2 { font-size: 1.15rem; margin: 0 0 0.3rem; letter-spacing: -0.01em; }
.group .note { color: var(--ink-soft); max-width: 62ch; margin: 0 0 1.1rem; }

.file {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 3px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.file .path {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: 0.82rem;
  padding: 0.6rem 0.9rem;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-soft);
  cursor: pointer;
}

.file .path:hover { color: var(--ink); }
.file .path::before { content: "▸ "; color: var(--ink-faint); }
.file[open-file] .path::before { content: "▾ "; }

.file pre {
  margin: 0;
  padding: 0.9rem;
  overflow-x: auto;
  font-size: 0.79rem;
  line-height: 1.6;
  background: var(--trace-ground);
  color: var(--trace-ink);
}

.file:not([open-file]) pre { display: none; }

.failed {
  border-left: 3px solid var(--refused);
  padding: 0.6rem 0.9rem;
  background: var(--panel);
  color: var(--refused);
  font-size: 0.9rem;
  border-radius: 3px;
  margin-top: 1rem;
}

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