/* S0 Production QC — industrial black-on-white, line-art, limited color.
   Visual reference: Tesla owner's manual. Color is reserved for LED swatches,
   pass/fail, and deliberate highlights only. */

:root {
  --ink:        #111111;   /* primary line / text */
  --ink-2:      #4a4f54;   /* secondary text */
  --ink-3:      #80868b;   /* tertiary / captions */
  --line:       #e2e4e7;   /* hairline rules */
  --line-2:     #cfd2d6;   /* slightly stronger rule */
  --paper:      #ffffff;
  --paper-2:    #fafbfc;   /* faint panel fill */
  --accent:     #1769aa;   /* single deliberate accent (links/active) */

  --ok:    #1f7a4d;
  --warn:  #b9770f;
  --fail:  #c0392b;
  --muted: #80868b;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", ui-monospace, Menlo, Consolas, monospace;

  --r: 6px;          /* corner radius */
  --pad: 20px;
  --nav-w: 248px;
  --top-h: 56px;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---------- top bar ---------- */
.topbar {
  height: var(--top-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--pad);
  border-bottom: 1px solid var(--line-2);
  position: sticky; top: 0; background: var(--paper); z-index: 10;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-logo { height: 30px; width: auto; display: block; }
.brand-product { font-weight: 600; font-size: 20px; letter-spacing: 4px; }
.brand-sub { color: var(--ink-3); font-size: 13px; letter-spacing: .5px; }

/* ---------- layout ---------- */
.layout { display: flex; min-height: calc(100vh - var(--top-h)); }
.sidenav {
  width: var(--nav-w); flex: 0 0 var(--nav-w);
  border-right: 1px solid var(--line-2);
  padding: 22px 14px; display: flex; flex-direction: column; gap: 24px;
  position: sticky; top: var(--top-h); height: calc(100vh - var(--top-h));
}
.sidenav-title {
  font-size: 11px; text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--ink-3); padding: 0 10px 8px;
}
.sidenav-list { list-style: none; margin: 0; padding: 0; }
.nav-item {
  display: block; padding: 9px 10px; border-radius: var(--r);
  color: var(--ink); text-decoration: none; font-size: 14px;
  border-left: 2px solid transparent;
}
.nav-item:hover { background: var(--paper-2); }
.nav-item.active {
  background: var(--paper-2); border-left-color: var(--accent);
  color: var(--accent); font-weight: 600;
}
.nav-item.disabled { color: var(--ink-3); cursor: default; pointer-events: none; }
.sidenav-foot { margin-top: auto; border-top: 1px solid var(--line); padding-top: 12px; }

/* ---------- view / page ---------- */
.view { flex: 1; padding: 32px 40px 80px; max-width: 1100px; outline: none; }
.page-head { margin-bottom: 8px; }
.page-head h1 { font-size: 26px; font-weight: 600; letter-spacing: .3px; margin: 0; }
.page-head .crumb { color: var(--ink-3); font-size: 12px; letter-spacing: 1px;
  text-transform: uppercase; margin-bottom: 6px; }
.page-intro { color: var(--ink-2); max-width: 70ch; margin: 10px 0 28px; }

/* section tabs within a page */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line-2); margin-bottom: 28px; }
.tab {
  appearance: none; background: none; border: 0; cursor: pointer;
  padding: 10px 16px; font: inherit; color: var(--ink-2);
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--ink); border-bottom-color: var(--ink); font-weight: 600; }

/* generic panels / cards */
.panel { border: 1px solid var(--line); border-radius: var(--r); padding: 22px; background: var(--paper); }
.section-title { font-size: 16px; font-weight: 600; margin: 36px 0 16px; }
.section-title:first-child { margin-top: 0; }
.muted { color: var(--ink-3); }
.mono { font-family: var(--mono); }

/* badges / status */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--line-2);
}
.badge-muted { color: var(--ink-3); }
.badge-ok   { color: var(--ok);   border-color: #b7d9c5; background: #f1f9f4; }
.badge-warn { color: var(--warn); border-color: #e6cf9d; background: #fbf5e9; }
.badge-fail { color: var(--fail); border-color: #e3b3ac; background: #fbeeec; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: currentColor; display: inline-block; }

/* buttons */
.btn {
  appearance: none; font: inherit; cursor: pointer;
  border: 1.5px solid var(--ink); background: var(--paper); color: var(--ink);
  border-radius: var(--r); padding: 8px 16px; font-weight: 500;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn:disabled { opacity: .4; cursor: default; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: #000; }
.btn-ghost { border-color: var(--line-2); }
.btn-ghost:hover { background: var(--paper-2); color: var(--ink); }
.btn-danger { border-color: var(--fail); color: var(--fail); }
.btn-danger:hover { background: var(--fail); color: var(--paper); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* inputs */
.field { display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }
.field label { font-size: 12px; color: var(--ink-2); letter-spacing: .3px; }
.field input, .field select {
  font: inherit; padding: 8px 10px; border: 1px solid var(--line-2);
  border-radius: var(--r); background: var(--paper); color: var(--ink);
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }

/* log / console output */
.log {
  font-family: var(--mono); font-size: 12.5px; line-height: 1.55;
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--r); padding: 12px 14px; max-height: 280px; overflow: auto;
  white-space: pre-wrap; color: var(--ink-2);
}
.log .ok   { color: var(--ok); }
.log .warn { color: var(--warn); }
.log .fail { color: var(--fail); }
.log .dim  { color: var(--ink-3); }

/* ---------- connectors ---------- */
.board-block { margin-bottom: 44px; }
.board-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.board-head h2 { font-size: 18px; font-weight: 600; margin: 0; }
.board-rev { font-family: var(--mono); font-size: 12px; color: var(--ink-3);
  border: 1px solid var(--line-2); border-radius: 4px; padding: 0 6px; }
.board-blurb { color: var(--ink-2); max-width: 76ch; margin: 8px 0 20px; }

.conn-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 18px; }
.conn-card { border: 1px solid var(--line); border-radius: var(--r); padding: 16px; background: var(--paper); }
.conn-card.hl { border-color: var(--ink); }
.conn-card h3 { margin: 0; font-size: 15px; display: flex; align-items: baseline; gap: 8px; }
.conn-card .ref { font-family: var(--mono); font-weight: 700; }
.conn-card .desc { color: var(--ink-2); font-size: 13px; margin: 2px 0 4px; }
.conn-card .part { color: var(--ink-3); font-size: 12px; font-family: var(--mono); margin-bottom: 12px; }
.conn-svg { width: 100%; height: auto; display: block; }
.conn-svg text { font-family: var(--mono); }
.conn-svg .pin-body { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; }
.conn-svg .pin-num  { fill: var(--ink); font-size: 9px; text-anchor: middle; }
.conn-svg .pin-net  { fill: var(--ink); font-size: 11px; }
.conn-svg .pin-fn   { fill: var(--ink-3); font-size: 9.5px; }
.conn-svg .lead     { stroke: var(--line-2); stroke-width: 1; }
.conn-svg .pinrow:hover .pin-body { stroke-width: 2.5; }
.conn-svg .pinrow:hover .pin-net  { font-weight: 700; }
.conn-svg .outline  { fill: none; stroke: var(--ink); stroke-width: 1.5; }

.legend { display: flex; flex-wrap: wrap; gap: 14px; margin: 6px 0 26px; }
.legend .key { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-2); }
.legend .sw { width: 12px; height: 12px; border-radius: 3px; border: 1px solid rgba(0,0,0,.15); }

/* led status table */
.kv-table { border-collapse: collapse; width: 100%; max-width: 420px; font-size: 13px; }
.kv-table td, .kv-table th { border: 1px solid var(--line); padding: 6px 10px; text-align: left; }
.kv-table th { background: var(--paper-2); font-weight: 600; }

/* ---------- process / steps ---------- */
.proc-layout { display: grid; grid-template-columns: 220px 1fr; gap: 28px; align-items: start; }
.steplist { list-style: none; margin: 0; padding: 0; position: sticky; top: calc(var(--top-h) + 20px); }
.steplist li {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px;
  border-radius: var(--r); cursor: pointer; color: var(--ink-2);
}
.steplist li:hover { background: var(--paper-2); }
.steplist li.active { background: var(--paper-2); color: var(--ink); font-weight: 600; }
.steplist .num {
  width: 22px; height: 22px; flex: 0 0 22px; border-radius: 50%;
  border: 1.5px solid var(--line-2); display: grid; place-items: center;
  font-size: 11px; font-family: var(--mono); color: var(--ink-3);
}
.steplist li.done .num { border-color: var(--ok); color: var(--ok); }
.steplist li.failed .num { border-color: var(--fail); color: var(--fail); }
.steplist li.active .num { border-color: var(--ink); color: var(--ink); }
.steplist li.locked { opacity: .4; cursor: not-allowed; pointer-events: none; }
.steplist li.locked .num { font-size: 10px; }

.step-pane h2 { font-size: 20px; font-weight: 600; margin: 0 0 4px; }
.step-pane .step-desc { color: var(--ink-2); margin: 0 0 22px; max-width: 70ch; }
.check-row { display: flex; align-items: flex-start; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.check-row:last-child { border-bottom: 0; }
.check-row input[type=checkbox] { margin-top: 3px; width: 16px; height: 16px; }
.check-row .ref { font-family: var(--mono); font-weight: 700; min-width: 64px; }

.telemetry { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px,1fr)); gap: 12px; margin: 18px 0; }
.tele-cell { border: 1px solid var(--line); border-radius: var(--r); padding: 10px 12px; }
.tele-cell .k { font-size: 11px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .5px; }
.tele-cell .v { font-size: 18px; font-family: var(--mono); margin-top: 2px; }

.led-swatches { display: flex; gap: 16px; flex-wrap: wrap; margin: 16px 0; }
.led-chip { display: flex; flex-direction: column; align-items: center; gap: 6px; font-size: 12px; }
.led-chip .bulb { width: 34px; height: 34px; border-radius: 50%; border: 1.5px solid var(--ink); box-shadow: inset 0 0 0 2px var(--paper); }

.banner { padding: 12px 14px; border-radius: var(--r); border: 1px solid var(--line-2); margin-bottom: 20px; font-size: 13px; }
.banner-warn { background: #fbf5e9; border-color: #e6cf9d; color: #7a5206; }
.banner-info { background: var(--paper-2); }

.measure-list { font-family: var(--mono); font-size: 12.5px; color: var(--ink-2); }
.measure-list div { padding: 2px 0; }

/* Failure-reason modal (operator enters why a step failed) */
.modal-overlay { position: fixed; inset: 0; background: rgba(17, 17, 17, .42);
  display: grid; place-items: center; z-index: 100; padding: 20px; }
.modal { background: var(--paper); border: 1px solid var(--line-2); border-radius: var(--r);
  padding: 22px; width: 100%; max-width: 460px; box-shadow: 0 10px 40px rgba(0, 0, 0, .25); }
.modal-label { display: block; font-size: 12px; color: var(--ink-2); letter-spacing: .3px; margin-bottom: 6px; }
.modal-textarea { width: 100%; font: inherit; padding: 8px 10px; border: 1px solid var(--line-2);
  border-radius: 4px; resize: vertical; }
.modal-textarea:focus { outline: none; border-color: var(--accent); }

/* Colourised LED hint (functional sections) */
.led-badge { display: inline-flex; align-items: center; gap: 6px; vertical-align: middle; }
.led-badge .bulb { width: 14px; height: 14px; border-radius: 50%; border: 1.5px solid var(--ink); display: inline-block; flex: none; }

/* Unrolled guided sections (flash + functional steps) */
.qc-sec { border: 1px solid var(--line); border-radius: var(--r); padding: 14px 16px; margin-bottom: 10px; background: var(--paper); }
.qc-sec-head { display: flex; align-items: center; gap: 8px; font-weight: 600; }
.qc-sec .qc-mark { display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px;
  border-radius: 50%; border: 1px solid var(--line-2); font-size: 12px; color: var(--ink-3); flex: none; }
.qc-sec .qc-title { flex: none; }
.qc-pending { opacity: .55; }
.qc-active { border-color: var(--ink); box-shadow: 0 0 0 1px var(--ink); }
.qc-active .qc-mark { border-color: var(--ink); color: var(--ink); }
.qc-done .qc-mark { border-color: var(--ok); color: var(--ok); }
.qc-done .qc-title { color: var(--ink-2); }
.qc-failed { border-color: var(--fail); }
.qc-failed .qc-mark { border-color: var(--fail); color: var(--fail); }