/* ─────────────────────────────────────────────────────────────────────
 * AI Search Diagnostic — hi-fi design system
 * Based on the brief's existing print palette (McKinsey blue / amber)
 * with a calmer paper background and a strict editorial type stack.
 * ─────────────────────────────────────────────────────────────────── */

:root {
  /* core palette — pinned to FRONTEND_BRIEF.md */
  --primary:  #003A70;   /* McKinsey blue */
  --primary-2:#002A52;   /* deeper hover */
  --accent:   #0073CF;   /* charts / link */
  --accent-2: #005FAB;
  --warn:     #C45A00;   /* amber */
  --warn-2:   #FFF6E5;   /* warn fill */

  --ink:    #1A1A1A;
  --ink-2:  #333333;
  --ink-3:  #666666;     /* muted */
  --ink-4:  #8A8A8A;     /* very muted */
  --rule:   #D9D9D9;
  --rule-2: #ECECEC;
  --light:  #F2F2F2;     /* light fill from brief */

  --paper:    #FAFAF7;   /* warm off-white — calmer than #FFFFFF */
  --paper-2:  #F4F2EC;   /* secondary surface */
  --paper-3:  #ECEAE3;
  --white:    #FFFFFF;

  /* type */
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans:  'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* rhythm */
  --rad: 2px;
  --rad-lg: 3px;

  /* shadows — almost none, per brief */
  --rule-shadow: 0 1px 0 var(--rule);
}

/* ─── reset / base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'ss01', 'cv11';
}
button { font: inherit; color: inherit; }
input, textarea, select, button { font-family: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ─── kicker / overlines ───────────────────────────────────────── */
.kicker {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}
.kicker.ink { color: var(--ink); }
.kicker.primary { color: var(--primary); }

/* ─── headlines (Georgia/Source Serif) ─────────────────────────── */
.h-serif {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.005em;
  color: var(--ink);
  line-height: 1.1;
}

/* ─── rules ────────────────────────────────────────────────────── */
.hr-thick { height: 1.5px; background: var(--ink); border: 0; }
.hr       { height: 1px;   background: var(--ink); border: 0; }
.hr-thin  { height: 1px;   background: var(--rule); border: 0; }

/* ─── stripe-like inputs (chrome only on focus) ────────────────── */
.input,
.textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 16px;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1.25px solid var(--rule);
  padding: 10px 0;
  outline: none;
  transition: border-color .15s ease;
}
.input::placeholder, .textarea::placeholder { color: var(--ink-4); }
.input:hover, .textarea:hover { border-bottom-color: var(--ink-3); }
.input:focus, .textarea:focus { border-bottom-color: var(--primary); }
.textarea {
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

.field-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 6px;
  display: block;
}

/* ─── chips ────────────────────────────────────────────────────── */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: 13px;
  border: 1px solid var(--rule);
  background: var(--white);
  color: var(--ink);
  border-radius: var(--rad);
  cursor: pointer;
  transition: all .12s ease;
}
.chip:hover { border-color: var(--ink-3); }
.chip.is-selected {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}
.chip.is-selected .chip-x { color: rgba(255,255,255,.7); }
.chip .chip-x {
  font-size: 14px;
  line-height: 1;
  color: var(--ink-4);
  cursor: pointer;
  margin-left: 2px;
}
.chip .chip-x:hover { color: var(--ink); }

/* ─── buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--rad);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .12s ease;
  font-family: var(--sans);
  letter-spacing: -0.005em;
}
.btn-primary {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-2); border-color: var(--primary-2); }
.btn-primary:disabled,
.btn-primary[aria-disabled="true"] {
  background: var(--rule);
  border-color: var(--rule);
  color: var(--ink-4);
  cursor: not-allowed;
}
.btn-ghost {
  background: transparent;
  color: var(--ink-2);
  border-color: transparent;
}
.btn-ghost:hover { color: var(--ink); }

.btn .arrow { font-size: 16px; line-height: 1; }

/* ─── cards / boxes ────────────────────────────────────────────── */
.surface {
  background: var(--white);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
}
.surface-flat {
  background: var(--paper-2);
  border: 1px solid var(--rule);
}

/* ─── pill / badge ─────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--light);
  color: var(--ink-3);
  border-radius: 2px;
}
.badge-ink   { background: var(--ink); color: var(--white); }
.badge-primary { background: var(--primary); color: var(--white); }
.badge-warn { background: var(--warn-2); color: var(--warn); }

/* ─── utility ──────────────────────────────────────────────────── */
.row { display: flex; }
.col { display: flex; flex-direction: column; }
.row-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 4px; } .gap-2 { gap: 8px; } .gap-3 { gap: 12px; } .gap-4 { gap: 16px; }
.gap-6 { gap: 24px; } .gap-8 { gap: 32px; } .gap-12 { gap: 48px; }
.muted { color: var(--ink-3); }
.muted-2 { color: var(--ink-4); }
.mono { font-family: var(--mono); }
.serif { font-family: var(--serif); }
.tac { text-align: center; }
.tar { text-align: right; }
.tnum { font-variant-numeric: tabular-nums; }
.no-select { user-select: none; }

/* ─── typeahead dropdown ──────────────────────────────────────── */
.typeahead-wrap { position: relative; }
.typeahead-pop {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--white);
  border: 1px solid var(--ink);
  border-radius: var(--rad-lg);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  z-index: 20;
  max-height: 360px;
  overflow-y: auto;
}
.typeahead-cat {
  padding: 8px 14px 4px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-4);
  background: var(--paper-2);
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
}
.typeahead-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--rule-2);
  transition: background .08s;
}
.typeahead-row:last-child { border-bottom: 0; }
.typeahead-row:hover, .typeahead-row.is-active { background: var(--paper-2); }
.typeahead-row.is-disabled { color: var(--ink-4); cursor: not-allowed; }
.typeahead-row .ta-name { font-size: 15px; }
.typeahead-row .ta-meta { font-family: var(--mono); font-size: 11px; color: var(--ink-4); }
.typeahead-row mark { background: transparent; color: var(--primary); font-weight: 600; }
.typeahead-empty {
  padding: 14px;
  font-size: 13px;
  color: var(--ink-3);
  text-align: center;
}

/* ─── form layout ──────────────────────────────────────────────── */
.shell {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: 100vh;
}
.rail {
  border-right: 1px solid var(--rule);
  padding: 36px 32px;
  background: var(--paper);
  position: relative;
  display: flex;
  flex-direction: column;
}
.rail-wordmark {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}
.rail-wordmark-sub {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.steplist {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-top: 48px;
}
.step {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  gap: 14px;
  align-items: flex-start;
  cursor: pointer;
}
.step-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  padding-top: 3px;
}
.step-label {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.25;
  color: var(--ink-4);
}
.step-sub {
  font-size: 12px;
  color: var(--ink-4);
  margin-top: 2px;
}
.step.is-active .step-num   { color: var(--primary); }
.step.is-active .step-label { color: var(--ink); }
.step.is-active .step-sub   { color: var(--ink-3); }
.step.is-done    .step-num   { color: var(--ink-3); }
.step.is-done    .step-label { color: var(--ink-2); }
.step.is-done    .step-sub   { color: var(--ink-3); }
.step-tick { color: var(--primary); font-size: 14px; padding-top: 3px; }

.rail-footer {
  margin-top: auto;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}

.stage {
  padding: 56px 64px 56px;
  max-width: 880px;
  position: relative;
}
.stage-header { margin-bottom: 32px; }
.stage-q {
  font-family: var(--serif);
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 8px 0 0;
}
.stage-help {
  margin-top: 10px;
  color: var(--ink-3);
  max-width: 60ch;
  font-size: 14.5px;
}

.stage-footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ─── peek-ahead block ─────────────────────────────────────────── */
.peek {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  color: var(--ink-3);
}
.peek-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
  font-size: 14px;
}
.peek-list-row { display: grid; grid-template-columns: 28px 1fr; gap: 8px; align-items: baseline; }
.peek-list-row .pn { font-family: var(--mono); font-size: 11px; color: var(--ink-4); }

/* ─── meta caps line ──────────────────────────────────────────── */
.meta-line {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.meta-line .dot { color: var(--ink-4); }

/* ─── peer-set summary card ───────────────────────────────────── */
.peerset {
  border: 1px solid var(--rule);
  background: var(--white);
  padding: 16px 18px;
  border-radius: var(--rad-lg);
}
.peerset-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 10px;
  font-size: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule-2);
}
.peerset-row:last-child { border-bottom: 0; }
.peerset-row .k { color: var(--ink-3); font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; padding-top: 3px; }

/* ─── scope helper rail (right side of step 3) ─────────────────── */
.scope-grid {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 32px;
  align-items: start;
}
.scope-tip-card {
  border-left: 2px solid var(--primary);
  padding: 4px 0 4px 14px;
  font-size: 13px;
  color: var(--ink-3);
}
.scope-tip-card strong { color: var(--ink); display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px; }

/* ─── focus ring ───────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.input:focus-visible, .textarea:focus-visible { outline: none; }

/* ─── small helpers ────────────────────────────────────────────── */
.scope-counter {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-4);
}
.scope-counter.is-warn { color: var(--warn); }

.peer-counter {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

/* ───────── Operator review screen ───────── */
.page { max-width: 880px; margin: 64px auto; padding: 0 32px; }
.mono { font-family: var(--mono, "JetBrains Mono", monospace); }
.back-link {
  display: inline-block; padding: 6px 0; color: var(--ink-3);
  text-decoration: none; font-size: 13px;
}
.back-link:hover { color: var(--ink); }

.row-link {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px; margin-bottom: 8px;
  border: 1px solid var(--rule); border-radius: 4px;
  text-decoration: none; color: inherit;
  transition: border-color 120ms ease;
}
.row-link:hover { border-color: var(--ink); }

.status {
  font-family: var(--mono, monospace); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--rule); color: var(--ink-3);
}
.status-pending, .status-reviewing { color: var(--ink); border-color: var(--ink); }
.status-approved, .status-queued { color: var(--primary); border-color: var(--primary); }
.status-running { background: var(--primary); color: #fff; border-color: var(--primary); }
.status-completed { color: var(--ink-3); border-color: var(--rule); }

.chip-warn {
  background: var(--warn-bg, #fff7e6); color: var(--warn, #b06d00);
  border-color: var(--warn, #b06d00);
}

.prompt-row {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 10px 12px; margin-bottom: 6px;
  border: 1px solid var(--rule); border-radius: 3px;
}
.prompt-row.is-vanity { background: var(--warn-bg, #fff7e6); border-color: var(--warn, #b06d00); }
.prompt-row textarea {
  flex: 1; resize: vertical; min-height: 28px;
  border: 0; background: transparent; padding: 4px 6px;
  font-family: inherit; font-size: 14px; color: var(--ink);
}
.prompt-row textarea:focus { outline: 1px solid var(--ink); border-radius: 2px; }
.prompt-row select {
  border: 1px solid var(--rule); border-radius: 3px;
  padding: 4px 8px; font-size: 12px; background: #fff; color: var(--ink-2);
}

.btn-icon {
  background: transparent; border: 0; cursor: pointer;
  font-size: 18px; color: var(--ink-4); padding: 2px 8px;
}
.btn-icon:hover { color: var(--warn, #b06d00); }
.btn-link {
  background: transparent; border: 0; cursor: pointer;
  font-size: 12px; color: var(--ink-3); padding: 0;
}
.btn-link:hover { color: var(--ink); text-decoration: underline; }

/* Provenance chip on each prompt row — surfaces where the prompt came from. */
.chip-source { font-size: 9px; letter-spacing: 0.08em; text-transform: uppercase; }
.chip-source-haiku   { border-color: var(--rule); color: var(--ink-3); }
.chip-source-paa     { border-color: var(--primary); color: var(--primary); }
.chip-source-related { border-color: var(--ink-3); color: var(--ink-3); background: var(--ink-bg, #f4f4f0); }
.chip-source-edited  { border-color: var(--warn, #b06d00); color: var(--warn, #b06d00); }