/* plate.css — shared chassis for the five instruments.
   Cool blueprint ground, hairline measurement grid, ink-blue type.
   Each instrument sets --sig (its signature hue) and nothing else. */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Serif:ital,wght@0,400;0,500;1,400&display=swap');

:root {
  --paper:      #E9EDF1;
  --plate:      #F4F6F8;
  --plate-sunk: #DFE5EB;
  --ink:        #0E2233;
  --ink-soft:   #4A5C6E;
  --ink-faint:  #7C8C9C;
  --rule:       #C3CDD6;
  --rule-fine:  #D6DDE4;
  --sig:        #1C56D6;
  --sig-wash:   rgba(28, 86, 214, 0.10);
  --warn:       #A8322B;
  --ok:         #1F6B4A;

  --grid: 4px;
  --rail: 310px;

  --fs-micro: 11px;
  --fs-small: 12.5px;
  --fs-base:  14px;
  --fs-lead:  16px;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:      #0B1722;
    --plate:      #10202E;
    --plate-sunk: #0A1520;
    --ink:        #DCE6EE;
    --ink-soft:   #93A6B6;
    --ink-faint:  #64798A;
    --rule:       #263A4B;
    --rule-fine:  #1B2C3B;
    --sig-wash:   rgba(90, 145, 255, 0.16);
  }
}

:root[data-theme="dark"] {
  --paper:      #0B1722;
  --plate:      #10202E;
  --plate-sunk: #0A1520;
  --ink:        #DCE6EE;
  --ink-soft:   #93A6B6;
  --ink-faint:  #64798A;
  --rule:       #263A4B;
  --rule-fine:  #1B2C3B;
  --sig-wash:   rgba(90, 145, 255, 0.16);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--fs-base)/1.5 "IBM Plex Sans", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* The measurement grid: fine graph paper, used as the literal backdrop of
   every result stage so plots sit on a real coordinate field. */
.plate-grid {
  background-color: var(--plate);
  background-image:
    linear-gradient(var(--rule-fine) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-fine) 1px, transparent 1px);
  background-size: 22px 22px;
  background-position: -1px -1px;
}

/* --- shell ---------------------------------------------------------------- */

.shell {
  display: grid;
  grid-template-columns: var(--rail) 1fr;
  grid-template-rows: auto 1fr;
  height: 100dvh;
}

.masthead {
  grid-column: 1 / -1;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--rule);
  background: var(--plate);
}

.masthead h1 {
  margin: 0;
  font: 500 var(--fs-lead)/1.2 "IBM Plex Serif", Georgia, serif;
  letter-spacing: -0.01em;
}

.masthead h1 .mark { color: var(--sig); }

.masthead .tagline {
  color: var(--ink-soft);
  font-size: var(--fs-small);
  margin-right: auto;
}

.masthead a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: var(--fs-small);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}
.masthead a:hover { color: var(--sig); border-color: var(--sig); }

.rail {
  border-right: 1px solid var(--rule);
  background: var(--plate);
  overflow-y: auto;
  padding: 0 0 40px;
}

.stage {
  overflow: auto;
  position: relative;
}

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

.group {
  border-bottom: 1px solid var(--rule-fine);
  padding: 14px 18px 16px;
}

.group > h2 {
  margin: 0 0 10px;
  font: 600 var(--fs-micro)/1 "IBM Plex Sans", sans-serif;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: none;
}

.field { margin-bottom: 11px; }
.field:last-child { margin-bottom: 0; }

.field > label {
  display: block;
  font-size: var(--fs-small);
  color: var(--ink-soft);
  margin-bottom: 4px;
}

select, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--plate-sunk);
  color: var(--ink);
  font: 400 var(--fs-base)/1.3 "IBM Plex Sans", sans-serif;
}

input[type="range"] { width: 100%; accent-color: var(--sig); }

select:focus-visible, input:focus-visible, button:focus-visible, .seg button:focus-visible {
  outline: 2px solid var(--sig);
  outline-offset: 1px;
}

button {
  font: 500 var(--fs-base)/1.3 "IBM Plex Sans", sans-serif;
  padding: 7px 12px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--plate-sunk);
  color: var(--ink);
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--sig); color: var(--sig); }
button:disabled { opacity: 0.45; cursor: default; }

button.primary {
  background: var(--sig);
  border-color: var(--sig);
  color: #fff;
  width: 100%;
}
button.primary:hover:not(:disabled) { filter: brightness(1.12); color: #fff; }

/* segmented control */
.seg { display: flex; border: 1px solid var(--rule); border-radius: 2px; overflow: hidden; }
.seg button {
  flex: 1;
  border: 0;
  border-radius: 0;
  border-left: 1px solid var(--rule);
  background: var(--plate-sunk);
  padding: 6px 4px;
  font-size: var(--fs-small);
}
.seg button:first-child { border-left: 0; }
.seg button[aria-pressed="true"] {
  background: var(--sig);
  color: #fff;
}

/* --- data typography ------------------------------------------------------ */

.num, td.num, .mono {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-variant-numeric: tabular-nums;
}

table.plate-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-small);
}

.plate-table th {
  text-align: left;
  font-weight: 600;
  color: var(--ink-faint);
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
  padding: 6px 10px;
  border-bottom: 1px solid var(--rule);
  background: var(--plate);
  position: sticky;
  top: 0;
  z-index: 2;
}

.plate-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--rule-fine);
}

.plate-table td.num, .plate-table th.num { text-align: right; }
.plate-table tbody tr:hover { background: var(--sig-wash); }

/* --- statements (mathematical / quoted) ----------------------------------- */

.statement {
  font: 400 var(--fs-lead)/1.45 "IBM Plex Serif", Georgia, serif;
}

.readout {
  border-top: 1px solid var(--rule);
  background: var(--plate);
  padding: 7px 18px;
  font-size: var(--fs-small);
  color: var(--ink-soft);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.readout b { font-weight: 600; color: var(--ink); }

.empty {
  padding: 40px 28px;
  max-width: 62ch;
  color: var(--ink-soft);
}
.empty h3 {
  font: 500 19px/1.3 "IBM Plex Serif", Georgia, serif;
  color: var(--ink);
  margin: 0 0 8px;
}


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

@media (max-width: 880px) {
  .shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr;
    height: auto;
    min-height: 100dvh;
  }
  .rail {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    max-height: none;
  }
  .stage { padding-inline: 0; }
  body { padding: 0; }
}

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