/* ---------------------------------------------------------------------------
   SQL Engine — instrument panel.

   The visual thesis: this is a bench instrument, not a chat window. A query is
   a signal passing through six stages, and the rail across the middle of the
   page is the readout. Amber means the signal was halted; teal means it passed.
   Everything else on the page is deliberately quiet so the rail is the one
   thing you remember.

   Type: IBM Plex Mono carries the display role, which inverts the usual
   hierarchy. In this product the machine's output is the headline, so the
   machine's typeface leads.
--------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;

  --ground:      #F6F8FA;
  --panel:       #FFFFFF;
  --panel-sunk:  #EEF2F6;
  --rule:        #DCE3EB;
  --rule-strong: #C3CDD9;
  --ink:         #151B23;
  --ink-mid:     #47535F;
  --ink-dim:     #6E7C8C;

  --pass:        #0F7A6E;
  --pass-soft:   #D6EFEA;
  --refuse:      #A85712;
  --refuse-soft: #FBE8D4;
  --trace:       #2A5C96;
  --trace-soft:  #DEE9F6;

  --shadow: 0 1px 2px rgba(21, 27, 35, .06), 0 8px 24px -12px rgba(21, 27, 35, .18);

  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", "Cascadia Mono", Menlo, monospace;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, "Segoe UI", Roboto, sans-serif;

  --gap: 20px;
  --radius: 3px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:      #0D1117;
    --panel:       #151A21;
    --panel-sunk:  #10151B;
    --rule:        #232C36;
    --rule-strong: #38434F;
    --ink:         #E4EBF2;
    --ink-mid:     #A7B4C2;
    --ink-dim:     #788695;

    --pass:        #45BFAF;
    --pass-soft:   #10312E;
    --refuse:      #E5913F;
    --refuse-soft: #382612;
    --trace:       #79A6DC;
    --trace-soft:  #162434;

    --shadow: 0 1px 0 rgba(255,255,255,.02), 0 12px 32px -18px rgba(0,0,0,.9);
  }
}

:root[data-theme="dark"] {
  --ground:      #0D1117;
  --panel:       #151A21;
  --panel-sunk:  #10151B;
  --rule:        #232C36;
  --rule-strong: #38434F;
  --ink:         #E4EBF2;
  --ink-mid:     #A7B4C2;
  --ink-dim:     #788695;

  --pass:        #45BFAF;
  --pass-soft:   #10312E;
  --refuse:      #E5913F;
  --refuse-soft: #382612;
  --trace:       #79A6DC;
  --trace-soft:  #162434;

  --shadow: 0 1px 0 rgba(255,255,255,.02), 0 12px 32px -18px rgba(0,0,0,.9);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
}

a { color: var(--trace); }

:focus-visible {
  outline: 2px solid var(--trace);
  outline-offset: 2px;
  border-radius: 2px;
}

.wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* --- masthead ------------------------------------------------------------ */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  padding: 34px 0 22px;
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  font-family: var(--mono);
  font-size: 27px;
  font-weight: 600;
  letter-spacing: -.035em;
  margin: 0;
}
.wordmark .bracket { color: var(--ink-dim); font-weight: 400; }

.tagline {
  font-size: 13.5px;
  color: var(--ink-mid);
  margin: 0;
  max-width: 44ch;
}

.masthead-spacer { flex: 1 1 40px; }

.chip-row { display: flex; gap: 8px; align-items: center; }

.pill {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  color: var(--ink-mid);
  background: var(--panel);
  white-space: nowrap;
}
.pill.live { border-color: var(--pass); color: var(--pass); }

button.ghost {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  color: var(--ink-mid);
  background: var(--panel);
  cursor: pointer;
}
button.ghost:hover { border-color: var(--ink-dim); color: var(--ink); }

/* --- mode tabs ------------------------------------------------------------ */

.modes {
  display: flex;
  gap: 0;
  margin: 26px 0 0;
  border-bottom: 1px solid var(--rule);
}

.mode {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 9px 0;
  margin-right: 26px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-dim);
  cursor: pointer;
}
.mode[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--ink); }
.mode:hover { color: var(--ink-mid); }

/* --- input --------------------------------------------------------------- */

.console { padding: 22px 0 4px; }

.field {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.field input[type="text"],
.field textarea {
  flex: 1;
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  color: var(--ink);
  padding: 12px 14px;
  font-family: var(--sans);
  font-size: 15px;
  box-shadow: var(--shadow);
}
.field textarea {
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
  resize: vertical;
  min-height: 92px;
}
.field input::placeholder, .field textarea::placeholder { color: var(--ink-dim); }

button.run {
  flex: 0 0 auto;
  align-self: flex-start;
  padding: 12px 22px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--ground);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  cursor: pointer;
}
button.run:hover { opacity: .88; }
button.run[disabled] { opacity: .45; cursor: default; }

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.suggestion {
  font-size: 12.5px;
  padding: 5px 11px;
  border: 1px solid var(--rule);
  border-radius: 100px;
  background: var(--panel);
  color: var(--ink-mid);
  cursor: pointer;
  font-family: var(--sans);
  text-align: left;
}
.suggestion:hover { border-color: var(--rule-strong); color: var(--ink); }
.suggestion.danger { font-family: var(--mono); font-size: 11.5px; color: var(--refuse); border-color: var(--refuse-soft); }
.suggestion.danger:hover { border-color: var(--refuse); }

.hint {
  font-size: 12.5px;
  color: var(--ink-dim);
  margin: 10px 0 0;
}

/* --- the rail: the signature element ------------------------------------- */

.rail-shell {
  margin-top: 30px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.rail-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--rule);
  background: var(--panel-sunk);
}

.rail-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.rail-verdict {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.rail-verdict.passed { color: var(--pass); }
.rail-verdict.refused { color: var(--refuse); }

.rail {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  padding: 22px 16px 20px;
  position: relative;
}

.stage { position: relative; padding-top: 26px; text-align: center; }

/* the connecting trace, drawn behind the nodes */
.stage::before {
  content: "";
  position: absolute;
  top: 7px;
  left: -50%;
  width: 100%;
  height: 1px;
  background: var(--rule-strong);
}
.stage:first-child::before { display: none; }

.stage[data-status="passed"]::before { background: var(--pass); }
.stage[data-status="refused"]::before { background: var(--refuse); }

.node {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1.5px solid var(--rule-strong);
  background: var(--panel);
}

.stage[data-status="passed"] .node {
  border-color: var(--pass);
  background: var(--pass);
  box-shadow: 0 0 0 4px var(--pass-soft);
}
.stage[data-status="refused"] .node {
  border-color: var(--refuse);
  background: var(--refuse);
  box-shadow: 0 0 0 4px var(--refuse-soft);
}
.stage[data-status="refused"] .node::after {
  content: "";
  position: absolute;
  inset: 4px;
  background: var(--panel);
  border-radius: 1px;
}

.stage-name {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.stage[data-status="passed"] .stage-name,
.stage[data-status="refused"] .stage-name { color: var(--ink); }

.stage-readout {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
  margin-top: 3px;
  min-height: 1.3em;
}

/* one orchestrated moment: the rail resolves left to right */
@media (prefers-reduced-motion: no-preference) {
  .rail.animate .stage { animation: settle .32s ease-out backwards; }
  .rail.animate .stage:nth-child(1) { animation-delay: .00s; }
  .rail.animate .stage:nth-child(2) { animation-delay: .07s; }
  .rail.animate .stage:nth-child(3) { animation-delay: .14s; }
  .rail.animate .stage:nth-child(4) { animation-delay: .21s; }
  .rail.animate .stage:nth-child(5) { animation-delay: .28s; }
  .rail.animate .stage:nth-child(6) { animation-delay: .35s; }
}
@keyframes settle {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: none; }
}

/* --- panels -------------------------------------------------------------- */

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  /* Panels size to their content rather than stretching to match each other; a
     refused query has no rows, and a tall empty box would imply something is missing. */
  align-items: start;
  gap: var(--gap);
  margin-top: var(--gap);
}

.panel {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
  min-width: 0;
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--rule);
  background: var(--panel-sunk);
}

.panel-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.panel-note {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
}

.panel-body { padding: 16px; }
.panel-body.flush { padding: 0; }

pre.code {
  margin: 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ink);
}

pre.tree {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-mid);
  overflow-x: auto;
  white-space: pre;
}

/* --- verdict list --------------------------------------------------------- */

.check {
  display: flex;
  gap: 11px;
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
  align-items: flex-start;
}
.check:last-child { border-bottom: none; }

.check-mark {
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  width: 1.4em;
}
.check.pass .check-mark { color: var(--pass); }
.check.fail .check-mark { color: var(--refuse); }
.check.skip .check-mark { color: var(--ink-dim); }
.check.skip .check-label { color: var(--ink-dim); }

.check-text { min-width: 0; }
.check-label { font-size: 13.5px; }
.check-detail {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-dim);
  margin-top: 3px;
  word-break: break-word;
}

.callout {
  border-left: 2px solid var(--refuse);
  background: var(--refuse-soft);
  padding: 11px 14px;
  margin: 0 0 14px;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.callout.info { border-left-color: var(--trace); background: var(--trace-soft); }
.callout-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--refuse);
  display: block;
  margin-bottom: 3px;
}
.callout.info .callout-title { color: var(--trace); }
.callout-body { font-size: 13.5px; color: var(--ink); }

/* --- attempts ------------------------------------------------------------- */

.attempt {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}
.attempt:last-child { margin-bottom: 0; }
.attempt-head {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  background: var(--panel-sunk);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.attempt-status { margin-left: auto; }
.attempt.fail .attempt-status { color: var(--refuse); }
.attempt.pass .attempt-status { color: var(--pass); }
.attempt-body { padding: 12px; }
.attempt-body pre { font-size: 12px; }
.attempt-reason {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--refuse);
  margin-top: 9px;
  padding-top: 9px;
  border-top: 1px solid var(--rule);
  word-break: break-word;
}

/* --- plan toggle ---------------------------------------------------------- */

.seg {
  display: inline-flex;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  overflow: hidden;
  margin-left: auto;
}
.seg button {
  appearance: none;
  border: none;
  background: var(--panel);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding: 4px 10px;
  cursor: pointer;
}
.seg button + button { border-left: 1px solid var(--rule-strong); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--ground); }

/* --- results table -------------------------------------------------------- */

.table-scroll { overflow-x: auto; max-height: 460px; overflow-y: auto; }

table { border-collapse: collapse; width: 100%; font-family: var(--mono); font-size: 12.5px; }

thead th {
  position: sticky;
  top: 0;
  background: var(--panel-sunk);
  text-align: left;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--ink-mid);
  padding: 8px 14px;
  border-bottom: 1px solid var(--rule-strong);
  white-space: nowrap;
}

tbody td {
  padding: 6px 14px;
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
  color: var(--ink);
}
tbody tr:last-child td { border-bottom: none; }
td.num { text-align: right; }
td.null { color: var(--ink-dim); font-style: italic; }

/* --- misc ----------------------------------------------------------------- */

.empty {
  padding: 44px 16px;
  text-align: center;
  color: var(--ink-dim);
  font-size: 13.5px;
}

.schema-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}
.schema-table { border: 1px solid var(--rule); border-radius: var(--radius); padding: 11px 13px; }
.schema-name {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
}
.schema-meta { font-family: var(--mono); font-size: 10.5px; color: var(--ink-dim); margin-bottom: 7px; }
.schema-col { font-family: var(--mono); font-size: 11.5px; color: var(--ink-mid); }
.schema-col span { color: var(--ink-dim); }

[hidden] { display: none !important; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
  .rail { grid-template-columns: repeat(3, 1fr); row-gap: 24px; }
  .stage:nth-child(4)::before { display: none; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 16px 64px; }
  .rail { grid-template-columns: repeat(2, 1fr); }
  .stage:nth-child(odd)::before { display: none; }
  .field { flex-direction: column; }
  button.run { align-self: stretch; }
}

/* ---------------------------------------------------------------------------
   Static demo additions (web/ only; the live server's page does not need them).
   Everything below reuses the tokens above: no new colours, no new faces.
--------------------------------------------------------------------------- */

.chip-row { flex-wrap: wrap; justify-content: flex-end; }

a.ghost {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  color: var(--ink-mid);
  background: var(--panel);
  text-decoration: none;
}
a.ghost:hover { border-color: var(--ink-dim); color: var(--ink); }

/* One honest line about what this page is. Quiet, like the hints. */
.modeline {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  margin: 14px 0 0;
  font-size: 12.5px;
  color: var(--ink-mid);
}
.modeline-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--trace);
  white-space: nowrap;
}

/* The SQL examples come in two kinds, and the label says which. */
.chip-label {
  display: block;
  margin: 16px 0 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.chip-label + .suggestions { margin-top: 8px; }
.chip-label.danger { color: var(--refuse); }

/* SQL is code, whichever way the verdict goes: same face as the refusal chips. */
.suggestion.sql { font-family: var(--mono); font-size: 11.5px; }

.suggestion.more {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-dim);
  border-style: dashed;
}

/* Scoring against the gold query: evaluation, kept visibly apart from verification. */
.callout.match { border-left-color: var(--pass); background: var(--pass-soft); }
.callout.match .callout-title { color: var(--pass); }
.callout pre.code { font-size: 12px; margin-top: 8px; }
.callout-body code {
  font-family: var(--mono);
  font-size: 12px;
  word-break: break-word;
}