/*
  MAT-SA 5 Whys — "Precision Instrument Panel" design system.

  Direction (v2, replacing the earlier case-file-ledger theme): clean,
  minimalist, and engineering-focused rather than paper/document-like —
  fitting a quality-engineering tool rather than a generic AI dashboard.
  A restrained "shine" (gloss highlight on the header band and primary
  interactive elements only, not decorated everywhere) reads as a
  calibrated instrument rather than a soft SaaS card.

  Palette:
    --bg        #F2F4F6  page background, faint blueprint grid
    --surface   #FFFFFF  panel background
    --ink       #10161C  primary text / header band
    --muted     #55626C  secondary text, labels
    --steel     #2B5C82  AI/QE-review accent, root cause, links
    --green     #1F7A5C  valid
    --red       #B33A2E  weak / not supported
    --rule      #DCE2E6  hairline borders
*/

:root {
  --bg: #F2F4F6;
  --surface: #FFFFFF;
  --ink: #10161C;
  --muted: #55626C;
  --steel: #2B5C82;
  --steel-soft: #E5EDF3;
  --green: #1F7A5C;
  --green-soft: #E1F0E8;
  --red: #B33A2E;
  --red-soft: #F5E1DE;
  --rule: #DCE2E6;

  --font-display: "Space Grotesk", "IBM Plex Sans", system-ui, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(43, 92, 130, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 92, 130, 0.045) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
}

/* ---------- Header ---------- */

.panel-header {
  position: relative;
  background: linear-gradient(160deg, #131B22 0%, #1B2731 55%, #101820 100%);
  color: #EDEFF1;
  padding: 22px 32px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 18px;
  overflow: hidden;
}

.panel-header::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0) 45%);
  pointer-events: none;
}

.panel-header::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--steel), #7FAFCB 50%, var(--steel));
}

.panel-header__mark {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: #8FA4B5;
  margin-bottom: 4px;
}

.panel-header h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.5rem;
  margin: 0;
  position: relative;
}

.panel-header__meta {
  display: flex;
  gap: 20px;
  position: relative;
}

.meta-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-field span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: #8FA4B5;
  text-transform: uppercase;
}

.meta-field input {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #EDEFF1;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 6px 10px;
  border-radius: 3px;
  min-width: 170px;
  width: 100%;
}

#reviewerName {
  min-width: 230px;
}

.meta-field input:focus {
  outline: none;
  border-color: var(--steel);
  box-shadow: 0 0 0 2px rgba(127, 175, 203, 0.35);
}

/* ---------- Folder tabs ---------- */

.folder-tabs {
  display: flex;
  gap: 2px;
  padding: 0 32px;
  margin-top: 16px;
  border-bottom: 1px solid var(--rule);
}

.folder-tab {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  background: transparent;
  color: var(--muted);
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 4px 12px;
  margin-right: 24px;
  cursor: pointer;
}

.folder-tab:disabled {
  cursor: default;
  opacity: 0.45;
}

.folder-tab.is-active {
  color: var(--ink);
  border-bottom-color: var(--steel);
}

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

.ledger-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 32px 60px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 30px 32px 36px;
  box-shadow: 0 1px 2px rgba(16, 22, 28, 0.04), 0 8px 24px rgba(16, 22, 28, 0.03);
}

.panel__heading {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
  margin: 0 0 6px;
}

.panel__subheading {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  margin: 28px 0 4px;
}

.panel__subheading-note {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--muted);
}

.panel__hint {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 22px;
  max-width: 62ch;
}

/* ---------- Fields ---------- */

.field {
  display: block;
  margin-bottom: 16px;
}

.field-row {
  display: flex;
  gap: 16px;
}

.field-row .field {
  flex: 1;
}

.field__label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 5px;
}

textarea,
input[type="text"],
input[type="date"],
input[type="datetime-local"] {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.98rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 10px 12px;
  resize: vertical;
}

input[type="date"],
input[type="datetime-local"] {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color-scheme: light;
}

textarea:focus,
input[type="text"]:focus,
input[type="date"]:focus,
input[type="datetime-local"]:focus {
  outline: none;
  border-color: var(--steel);
  box-shadow: 0 0 0 3px var(--steel-soft);
}

/* ---------- Buttons ---------- */

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 5px;
  padding: 10px 18px;
  border: 1px solid transparent;
  cursor: pointer;
  position: relative;
}

.btn--primary {
  background: linear-gradient(180deg, #21455F, var(--ink));
  color: #F4F7F9;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}
.btn--primary:hover { background: linear-gradient(180deg, #285270, #0C1218); }

.btn--large { padding: 13px 26px; font-size: 0.98rem; }

.btn--accept {
  background: linear-gradient(180deg, #2C8C68, var(--green));
  color: #fff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.btn--edit {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--rule);
}

.btn--own {
  background: var(--surface);
  color: var(--muted);
  border-color: var(--rule);
}

.btn--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule);
}

.btn--small {
  font-size: 0.8rem;
  padding: 6px 12px;
  margin-top: 10px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ---------- Why chain ---------- */

.why-chain {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.why-row {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
  align-items: flex-start;
}

.why-row:last-child { border-bottom: none; }

.why-row__stamp {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--rule);
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink);
}

.why-row.is-root .why-row__stamp {
  border-color: var(--steel);
  color: var(--steel);
  background: var(--steel-soft);
}

.why-row__body {
  flex: 1;
  padding-top: 3px;
}

.why-row__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin-bottom: 3px;
}

.why-row__text {
  margin: 0;
  font-size: 1rem;
}

.why-row__source {
  display: inline-block;
  margin-top: 5px;
  font-size: 0.74rem;
  font-family: var(--font-mono);
  color: var(--muted);
}

/* ---------- AI suggestion block ---------- */

.ai-suggestion {
  background: var(--steel-soft);
  border: 1px solid #C9DAE6;
  border-left: 3px solid var(--steel);
  border-radius: 6px;
  padding: 18px 20px;
  margin-bottom: 18px;
}

.ai-suggestion__badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--steel);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.ai-suggestion__text {
  font-size: 1.02rem;
  margin: 0 0 8px;
}

.ai-suggestion__meta {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0 0 6px;
}

.ai-suggestion__evidence {
  font-size: 0.88rem;
  font-style: italic;
  color: var(--muted);
  margin: 0 0 10px;
}

.ai-suggestion__confidence {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.ai-suggestion__weak-warning {
  background: var(--red-soft);
  color: var(--red);
  border: 1px solid #E3BDB6;
  border-radius: 5px;
  padding: 10px 12px;
  font-size: 0.88rem;
  margin-bottom: 14px;
}

.ai-suggestion__actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.own-why {
  background: #FAFBFC;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 16px 18px;
  margin-bottom: 18px;
}

.own-why__actions {
  display: flex;
  gap: 10px;
}

.loading-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 10px 0;
}

.spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--rule);
  border-top-color: var(--steel);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; }
}

/* ---------- Root cause seal ---------- */

.stamp-block {
  display: flex;
  align-items: center;
  gap: 18px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 20px 22px;
  margin-bottom: 24px;
  background: linear-gradient(180deg, #FBFCFD, var(--surface));
}

.stamp-block__seal {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, #EAF1F7, #CBDCE8 70%, #B9CEDC);
  border: 1px solid #A9C1D2;
  color: var(--steel);
  font-size: 1.2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.8), 0 1px 2px rgba(16, 22, 28, 0.12);
}

.stamp-block__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 5px;
}

.stamp-block__text {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  margin: 0;
}

/* ---------- Senior QE review block ---------- */

.review-block {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 20px 22px;
  margin-bottom: 30px;
  background: var(--surface);
}

.review-block__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
}

.review-block__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
}

.review-block__subtitle {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 2px;
}

.challenge-result {
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}

.challenge-result__verdict {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
  font-weight: 600;
}

.challenge-result__verdict.valid { color: var(--green); }
.challenge-result__verdict.partial { color: var(--steel); }
.challenge-result__verdict.invalid { color: var(--red); }

.challenge-result ul {
  margin: 8px 0 0;
  padding-left: 18px;
  font-size: 0.88rem;
  color: var(--muted);
}

.challenge-result__signoff {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
}

/* ---------- Action tables ---------- */

.action-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.action-row {
  display: grid;
  grid-template-columns: 2fr 1.1fr 0.8fr 0.8fr auto;
  gap: 8px;
  align-items: center;
}

.action-row--header {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  text-transform: uppercase;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--rule);
}

.action-row input {
  font-size: 0.88rem;
  padding: 8px 10px;
}

.action-row__remove {
  background: transparent;
  border: none;
  color: var(--red);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 8px;
}

.action-table__empty {
  color: var(--muted);
  font-size: 0.88rem;
  font-style: italic;
}

/* ---------- Report actions ---------- */

.report-actions {
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--rule);
  padding-top: 24px;
}

.report-actions__status {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Footer ---------- */

.ledger-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 32px 40px;
  color: var(--muted);
  font-size: 0.8rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .panel-header { padding: 18px 18px; }
  .panel-header__meta { gap: 12px; }
  .meta-field input { min-width: 140px; }
  .folder-tabs { padding: 0 18px; }
  .ledger-page { padding: 20px 18px 50px; }
  .panel { padding: 22px 18px 28px; }
  .field-row { flex-direction: column; gap: 0; }
  .action-row {
    grid-template-columns: 1fr;
    border-bottom: 1px dashed var(--rule);
    padding-bottom: 10px;
  }
  .action-row--header { display: none; }
  .review-block__header { flex-direction: column; }
  .ledger-footer { padding: 0 18px 40px; }
}

/* ---------- Focus visibility ---------- */

.btn:focus-visible,
.folder-tab:focus-visible,
button:focus-visible {
  outline: 2px solid var(--steel);
  outline-offset: 2px;
}

/* Any element with a class that sets its own `display` (e.g. .loading-row's
   flex) would otherwise override the browser default for [hidden], since
   that default lives in the low-priority user-agent stylesheet. Force it
   explicitly so hidden elements never render regardless of their class. */
[hidden] {
  display: none !important;
}