/* ─── Reset & base ────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ─── Design tokens — light (default) ────────────────────────────────── */
:root {
  --clr-bg:          #f0f4f8;
  --clr-surface:     #ffffff;
  --clr-surface-alt: #fafbfc;
  --clr-border:      #dde1e7;
  --clr-border-soft: #eaecef;

  --clr-text:        #1a2236;
  --clr-text-soft:   #50576b;
  --clr-text-muted:  #8792a2;

  --clr-accent:      #2563eb;
  --clr-accent-dark: #1d4ed8;
  --clr-accent-bg:   #eff6ff;
  --clr-accent-ring: #bfdbfe;

  --clr-teal:        #0ea5e9;
  --clr-purple:      #7c3aed;

  --clr-success:     #16a34a;
  --clr-success-bg:  #dcfce7;
  --clr-warn:        #92400e;
  --clr-warn-bg:     #fef3c7;
  --clr-error:       #b91c1c;
  --clr-error-bg:    #fef2f2;
  --clr-error-bdr:   #fecaca;

  /* Confidence label colours */
  --clr-conf-confirmed:   #166534;
  --clr-conf-confirmed-bg:#dcfce7;
  --clr-conf-confirmed-bd:#bbf7d0;
  --clr-conf-likely:      #1e40af;
  --clr-conf-likely-bg:   #dbeafe;
  --clr-conf-likely-bd:   #bfdbfe;
  --clr-conf-possible:    #6b21a8;
  --clr-conf-possible-bg: #f3e8ff;
  --clr-conf-possible-bd: #e9d5ff;
  --clr-conf-info:        #0f766e;
  --clr-conf-info-bg:     #ccfbf1;
  --clr-conf-info-bd:     #99f6e4;

  /* Layout */
  --sidebar-width:   230px;
  --topbar-height:   56px;

  --radius-sm:  6px;
  --radius-md:  8px;
  --radius-lg:  12px;

  --shadow-xs:  0 1px 2px rgba(0,0,0,.06);
  --shadow-sm:  0 1px 4px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,.08), 0 1px 3px rgba(0,0,0,.05);

  --transition: 0.15s ease;
}

/* ─── Design tokens — dark ────────────────────────────────────────────── */
[data-theme="dark"] {
  --clr-bg:          #0f1117;
  --clr-surface:     #1a1d27;
  --clr-surface-alt: #1e2130;
  --clr-border:      #2e3347;
  --clr-border-soft: #252838;

  --clr-text:        #e8eaf0;
  --clr-text-soft:   #9ba3b8;
  --clr-text-muted:  #636b82;

  --clr-accent:      #60a5fa;
  --clr-accent-dark: #93c5fd;
  --clr-accent-bg:   #1e2a40;
  --clr-accent-ring: #2d4a7a;

  --clr-teal:        #38bdf8;
  --clr-purple:      #a78bfa;

  --clr-success:     #4ade80;
  --clr-success-bg:  #14301e;
  --clr-warn:        #fbbf24;
  --clr-warn-bg:     #2d2008;
  --clr-error:       #f87171;
  --clr-error-bg:    #2d1111;
  --clr-error-bdr:   #4d1f1f;

  --clr-conf-confirmed:   #4ade80;
  --clr-conf-confirmed-bg:#14301e;
  --clr-conf-confirmed-bd:#1a4d28;
  --clr-conf-likely:      #93c5fd;
  --clr-conf-likely-bg:   #1e2a40;
  --clr-conf-likely-bd:   #2d3f5a;
  --clr-conf-possible:    #c4b5fd;
  --clr-conf-possible-bg: #1e1630;
  --clr-conf-possible-bd: #2e234d;
  --clr-conf-info:        #5eead4;
  --clr-conf-info-bg:     #0d2824;
  --clr-conf-info-bd:     #134038;

  --shadow-xs:  0 1px 3px rgba(0,0,0,.4);
  --shadow-sm:  0 1px 5px rgba(0,0,0,.5), 0 1px 2px rgba(0,0,0,.3);
  --shadow-md:  0 4px 16px rgba(0,0,0,.5), 0 1px 4px rgba(0,0,0,.3);
}

/* ─── Dark mode sidebar overrides ─────────────────────────────────────── */
/* Sidebar uses its own dark palette; these reinforce it in dark theme */
[data-theme="dark"] .sidebar {
  background: #0d1220;
  border-right-color: #151e35;
}

/* ─── Page layout — full-height grid ─────────────────────────────────── */
html, body {
  height: 100%;
}

body {
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: var(--clr-text);
  background: var(--clr-bg);
  display: grid;
  grid-template-rows: var(--topbar-height) 1fr;
  grid-template-columns: 1fr;
  min-height: 100vh;
}

/* ─── Top bar ──────────────────────────────────────────────────────────── */
.topbar {
  grid-row: 1;
  grid-column: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px 0 16px;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border-soft);
  box-shadow: var(--shadow-xs);
  z-index: 50;
  height: var(--topbar-height);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.topbar-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.topbar-brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.topbar-name {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.3px;
  line-height: 1.2;
}

.topbar-name strong {
  color: var(--clr-accent);
}

.topbar-tagline {
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ─── Dashboard — sidebar + workspace ────────────────────────────────── */
.dashboard {
  grid-row: 2;
  grid-column: 1;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: 1fr;
  min-height: 0; /* allow children to scroll */
  overflow: hidden;
}

/* ─── Sidebar ─────────────────────────────────────────────────────────── */
.sidebar {
  grid-column: 1;
  background: #15213d;
  border-right: 1px solid #1e2f52;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding-bottom: 20px;
}

/* Sidebar brand block */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 16px 14px;
  border-bottom: 1px solid rgba(255,255,255,.07);
  margin-bottom: 8px;
  flex-shrink: 0;
}

.sidebar-logo-icon {
  flex-shrink: 0;
}

.sidebar-brand-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: #e8eaf0;
  letter-spacing: -0.3px;
  line-height: 1.2;
}

.sidebar-brand-name strong {
  color: #60a5fa;
}

/* Section label above nav items */
.sidebar-section-label {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,.28);
  padding: 0 20px 6px;
  margin-top: 2px;
}

.sidebar-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 10px;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 9px 12px;
  background: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  color: #8fa8cc;
  text-align: left;
  transition: background var(--transition), color var(--transition);
  line-height: 1.4;
}

.sidebar-item:hover {
  background: rgba(255,255,255,.07);
  color: #d4dff0;
}

.sidebar-item--active {
  background: rgba(96,165,250,.18);
  color: #93c5fd;
  font-weight: 600;
  border-left: 3px solid #60a5fa;
  padding-left: 9px;
}

.sidebar-item--active:hover {
  background: rgba(96,165,250,.24);
}

.sidebar-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}

.sidebar-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-item:focus-visible {
  outline: 2px solid rgba(96,165,250,.6);
  outline-offset: 2px;
}

/* ─── Main workspace ──────────────────────────────────────────────────── */
.workspace {
  grid-column: 2;
  overflow-y: auto;
  background: var(--clr-bg);
}

/* ─── Views (nav sections) ────────────────────────────────────────────── */
.view {
  display: flex;
  flex-direction: column;
  padding: 28px 32px 48px;
  min-height: 100%;
}

.view--hidden {
  display: none;
}

.view-header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--clr-border-soft);
}

.view-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.02em;
}

.view-subtitle {
  margin-top: 4px;
  font-size: 0.875rem;
  color: var(--clr-text-soft);
}

.view-content {
  flex: 1;
}

.view-empty-hint {
  color: var(--clr-text-muted);
  font-size: 0.9375rem;
  font-style: italic;
  margin-top: 16px;
}

/* ─── Upload card ─────────────────────────────────────────────────────── */
.upload-card {
  max-width: 580px;
}

/* ─── Drop zone ───────────────────────────────────────────────────────── */
.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 44px 24px;
  border: 2px dashed var(--clr-border);
  border-radius: var(--radius-lg);
  background: var(--clr-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  color: var(--clr-text-muted);
  text-align: center;
  box-shadow: var(--shadow-xs);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--clr-accent);
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
  box-shadow: var(--shadow-sm);
}

.drop-zone:focus-within {
  outline: 2px solid var(--clr-accent-ring);
  outline-offset: 2px;
}

.drop-zone svg {
  transition: transform var(--transition);
}

.drop-zone:hover svg,
.drop-zone.drag-over svg {
  transform: translateY(-2px);
}

.drop-label {
  font-size: 0.9375rem;
  color: var(--clr-text-soft);
}

.drop-zone:hover .drop-label,
.drop-zone.drag-over .drop-label {
  color: var(--clr-accent);
}

.file-link {
  color: var(--clr-accent);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 600;
}

.drop-hint {
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.01em;
}

/* ─── Selected file pill ──────────────────────────────────────────────── */
.selected-file {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  padding: 9px 14px;
  background: var(--clr-accent-bg);
  border: 1px solid var(--clr-accent-ring);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--clr-text);
  word-break: break-all;
}

.clear-btn {
  flex-shrink: 0;
  background: none;
  border: none;
  font-size: 1.125rem;
  line-height: 1;
  color: var(--clr-text-muted);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color var(--transition), background var(--transition);
}

.clear-btn:hover {
  color: var(--clr-error);
  background: var(--clr-error-bg);
}

.clear-btn:focus-visible {
  outline: 2px solid var(--clr-accent);
  outline-offset: 2px;
}

/* ─── Primary button ──────────────────────────────────────────────────── */
.btn-primary {
  display: block;
  width: 100%;
  margin-top: 20px;
  padding: 11px 20px;
  background: var(--clr-accent);
  color: #ffffff;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: var(--shadow-xs);
}

.btn-primary:hover:not(:disabled) {
  background: var(--clr-accent-dark);
  box-shadow: var(--shadow-sm);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(1px);
  box-shadow: none;
}

.btn-primary:focus-visible {
  outline: 2px solid var(--clr-accent-ring);
  outline-offset: 2px;
}

.btn-primary:disabled {
  background: var(--clr-accent-ring);
  color: var(--clr-accent);
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

/* ─── Secondary button ────────────────────────────────────────────────── */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 7px 16px;
  background: var(--clr-surface);
  color: var(--clr-accent);
  font-size: 0.875rem;
  font-weight: 600;
  border: 1px solid var(--clr-accent);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background: var(--clr-accent-bg);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:active {
  transform: translateY(1px);
  box-shadow: none;
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--clr-accent-ring);
  outline-offset: 2px;
}

/* ─── Status messages (upload) ────────────────────────────────────────── */
#status {
  margin-top: 18px;
  font-size: 0.875rem;
  min-height: 22px;
  max-width: 580px;
}

#status.loading {
  color: var(--clr-text-soft);
}

#status.error {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--clr-error);
  background: var(--clr-error-bg);
  border: 1px solid var(--clr-error-bdr);
  border-radius: var(--radius-md);
  padding: 10px 14px;
}

/* ─── Dismiss button (inside error messages) ──────────────────────────── */
.error-dismiss {
  flex-shrink: 0;
  margin-left: auto;
  background: none;
  border: none;
  font-size: 1.125rem;
  line-height: 1;
  color: var(--clr-error);
  cursor: pointer;
  padding: 0 2px;
  border-radius: 4px;
  opacity: 0.7;
  transition: opacity var(--transition), background var(--transition);
}

.error-dismiss:hover {
  opacity: 1;
  background: rgba(0,0,0,.06);
}

.error-dismiss:focus-visible {
  outline: 2px solid var(--clr-error);
  outline-offset: 2px;
}

/* ─── Spinner animation ───────────────────────────────────────────────── */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading::before {
  content: '';
  display: inline-block;
  width: 13px;
  height: 13px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -2px;
  margin-right: 7px;
  flex-shrink: 0;
}

/* ─── Result card ─────────────────────────────────────────────────────── */
.result-card {
  margin-top: 20px;
  max-width: 580px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-soft);
  border-left: 4px solid var(--clr-success);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}

.result-card h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-success);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* checkmark icon before "Upload Successful" */
.result-card h2::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--clr-success-bg);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clr-success);
  flex-shrink: 0;
}

.result-card dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 18px;
  margin-bottom: 4px;
}

.result-card dt {
  font-weight: 500;
  color: var(--clr-text-soft);
  font-size: 0.8125rem;
  align-self: baseline;
}

.result-card dd {
  color: var(--clr-text);
  font-size: 0.9375rem;
  word-break: break-all;
}

/* ─── Requirements section toolbar ───────────────────────────────────── */
.req-section-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

/* ─── Inline status rows ──────────────────────────────────────────────── */
#req-status,
#analyze-status {
  margin-top: 14px;
  font-size: 0.875rem;
  min-height: 22px;
}

#req-status.info,
#analyze-status.info {
  color: var(--clr-text-soft);
  margin-top: 16px;
}

#req-status.loading,
#analyze-status.loading {
  color: var(--clr-text-soft);
}

#req-status.error,
#analyze-status.error {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--clr-error);
  background: var(--clr-error-bg);
  border: 1px solid var(--clr-error-bdr);
  border-radius: var(--radius-md);
  padding: 10px 14px;
}

/* ─── Requirements list ───────────────────────────────────────────────── */
.req-list {
  list-style: none;
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.req-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.875rem;
  box-shadow: var(--shadow-xs);
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

.req-text {
  flex: 1;
  color: var(--clr-text);
  line-height: 1.55;
}

/* ─── Status badges ───────────────────────────────────────────────────── */
.req-badge {
  flex-shrink: 0;
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
  border: 1px solid transparent;
}

.req-badge--pending,
.req-badge--unknown,
.req-badge--raw {
  background: var(--clr-surface-alt);
  color: var(--clr-text-soft);
  border-color: var(--clr-border);
}

.req-badge--passed,
.req-badge--done,
.req-badge--complete,
.req-badge--completed,
.req-badge--refined {
  background: var(--clr-success-bg);
  color: var(--clr-success);
  border-color: var(--clr-conf-confirmed-bd);
}

.req-badge--failed,
.req-badge--error {
  background: var(--clr-error-bg);
  color: var(--clr-error);
  border-color: var(--clr-error-bdr);
}

.req-badge--in_progress,
.req-badge--in-progress,
.req-badge--processing,
.req-badge--analyzed,
.req-badge--clarified {
  background: var(--clr-warn-bg);
  color: var(--clr-warn);
  border-color: var(--clr-conf-likely-bd);
}

/* ─── Clickable requirement items ─────────────────────────────────────── */
.req-item[role="button"] {
  cursor: pointer;
}

.req-item[role="button"]:hover {
  border-color: var(--clr-accent);
  background: var(--clr-accent-bg);
  box-shadow: var(--shadow-sm);
}

.req-item[role="button"]:focus-visible {
  outline: 2px solid var(--clr-accent-ring);
  outline-offset: 2px;
}

.req-item--selected {
  border-color: var(--clr-accent);
  background: var(--clr-accent-bg);
  box-shadow: 0 0 0 3px var(--clr-accent-ring);
  border-left: 3px solid var(--clr-accent);
}

/* ─── Analyze button row ──────────────────────────────────────────────── */
.analyze-btn-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.analyze-btn-main {
  flex: 1;
  min-width: 180px;
  margin-top: 0;
}

.btn-demo {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--clr-surface);
  color: var(--clr-conf-possible);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1.5px solid var(--clr-conf-possible-bd);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-xs);
  white-space: nowrap;
}

.btn-demo:hover {
  background: var(--clr-conf-possible-bg);
  border-color: var(--clr-conf-possible);
  box-shadow: var(--shadow-sm);
}

.btn-demo:active {
  transform: translateY(1px);
  box-shadow: none;
}

.btn-demo:focus-visible {
  outline: 2px solid var(--clr-conf-possible-bd);
  outline-offset: 2px;
}

.btn-demo-icon {
  font-size: 0.875rem;
}

/* ─── Analyze result ──────────────────────────────────────────────────── */
.analyze-result {
  margin-top: 14px;
  background: var(--clr-accent-bg);
  border: 1px solid var(--clr-accent-ring);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.875rem;
  color: var(--clr-text);
  line-height: 1.65;
}

/* ─── Analysis failure box ────────────────────────────────────────────── */
.analysis-failure-box {
  background: var(--clr-error-bg);
  border: 1px solid var(--clr-error-bdr);
  border-left: 4px solid var(--clr-error);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 0.875rem;
  color: var(--clr-error);
  line-height: 1.55;
  position: relative;
}

.analysis-failure-box strong {
  display: block;
  font-size: 0.9375rem;
  margin-bottom: 6px;
  padding-right: 28px; /* room for dismiss btn */
}

.analysis-failure-box p {
  margin: 0 0 4px;
  color: var(--clr-text-soft);
}

/* × button inside analysis-failure-box */
.analysis-failure-dismiss {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--clr-error);
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition), background var(--transition);
}

.analysis-failure-dismiss:hover {
  opacity: 1;
  background: rgba(0,0,0,.07);
}

.analysis-failure-dismiss:focus-visible {
  outline: 2px solid var(--clr-error);
  outline-offset: 2px;
}

.analysis-failure-meta {
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
}

.analysis-failure-hint {
  margin-top: 8px !important;
  font-style: italic;
  font-size: 0.875rem;
  color: var(--clr-text-muted) !important;
}

/* ─── Requirement detail panel ────────────────────────────────────────── */
.req-detail {
  margin-top: 20px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-soft);
  border-left: 4px solid var(--clr-accent);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  box-shadow: var(--shadow-md);
}

.req-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--clr-border-soft);
}

.req-detail-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.01em;
}

.req-detail-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.req-detail-close:hover {
  color: var(--clr-error);
  background: var(--clr-error-bg);
  border-color: var(--clr-error-bdr);
}

.req-detail-close:focus-visible {
  outline: 2px solid var(--clr-accent-ring);
  outline-offset: 2px;
}

#req-detail-status {
  font-size: 0.875rem;
  min-height: 22px;
}

#req-detail-status.loading {
  color: var(--clr-text-soft);
}

#req-detail-status.error {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--clr-error);
  background: var(--clr-error-bg);
  border: 1px solid var(--clr-error-bdr);
  border-radius: var(--radius-md);
  padding: 10px 14px;
}

.req-detail-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.req-detail-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.req-detail-text {
  font-size: 0.9375rem;
  color: var(--clr-text);
  line-height: 1.65;
  margin-bottom: 22px;
  padding: 14px 16px;
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-sm);
}

/* ─── Section headings inside detail ─────────────────────────────────── */
.req-detail-findings-heading,
.req-detail-section-heading {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--clr-border-soft);
}

.req-detail-section-heading {
  margin-top: 24px;
}

/* "Not analyzed yet" placeholder */
.req-detail-empty {
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  font-style: italic;
}

/* ─── Finding cards ───────────────────────────────────────────────────── */
.finding-card {
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 8px;
}

.finding-card:last-child {
  margin-bottom: 0;
}

.finding-dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 18px;
}

.finding-dl dt {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  align-self: baseline;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.finding-dl dd {
  font-size: 0.875rem;
  color: var(--clr-text);
  line-height: 1.55;
  word-break: break-word;
}

/* ─── Refinement blocks ───────────────────────────────────────────────── */
.refinement-block {
  margin-bottom: 16px;
  padding: 14px 16px;
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-md);
}

.refinement-block:last-child {
  margin-bottom: 0;
}

.refinement-block-heading {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 8px;
}

.refinement-text {
  font-size: 0.9375rem;
  color: var(--clr-text);
  line-height: 1.65;
}

.refinement-list {
  padding-left: 18px;
  font-size: 0.875rem;
  color: var(--clr-text);
  line-height: 1.65;
}

.refinement-list li {
  margin-bottom: 5px;
}

/* ─── Refinement status ───────────────────────────────────────────────── */
#req-refinement-status {
  font-size: 0.875rem;
  min-height: 20px;
  margin-bottom: 4px;
}

#req-refinement-status.loading {
  color: var(--clr-text-soft);
}

#req-refinement-status.error {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--clr-error);
  background: var(--clr-error-bg);
  border: 1px solid var(--clr-error-bdr);
  border-radius: var(--radius-md);
  padding: 8px 12px;
}

/* ─── Test case cards ─────────────────────────────────────────────────── */
.test-case-card {
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-border-soft);
  border-left: 3px solid var(--clr-accent);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 8px;
  font-size: 0.875rem;
  color: var(--clr-text);
  line-height: 1.55;
}

.test-case-card:last-child {
  margin-bottom: 0;
}

.test-case-title {
  font-weight: 700;
  color: var(--clr-text);
  margin-bottom: 6px;
  font-size: 0.875rem;
}

/* ─── Traceability view ───────────────────────────────────────────────── */
.traceability-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--clr-border-soft);
}

.traceability-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.02em;
  margin: 0;
}

#traceability-status {
  font-size: 0.875rem;
  color: var(--clr-text-soft);
  margin-bottom: 12px;
  min-height: 1.4em;
}

#traceability-status.loading {
  color: var(--clr-text-soft);
}

#traceability-status.error {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--clr-error);
  background: var(--clr-error-bg);
  border: 1px solid var(--clr-error-bdr);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}

#traceability-status.info {
  color: var(--clr-text-soft);
}

.traceability-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.traceability-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  color: var(--clr-text);
  background: var(--clr-surface);
}

.traceability-table thead {
  background: var(--clr-surface-alt);
  position: sticky;
  top: 0;
  z-index: 1;
}

.traceability-table th {
  text-align: left;
  padding: 11px 16px;
  font-weight: 700;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-muted);
  border-bottom: 2px solid var(--clr-border);
  white-space: nowrap;
}

.traceability-table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--clr-border-soft);
  vertical-align: top;
  line-height: 1.55;
  word-break: break-word;
}

.traceability-table tr:last-child td {
  border-bottom: none;
}

.traceability-table tbody tr:nth-child(even) {
  background: var(--clr-surface-alt);
}

.traceability-table tbody tr:hover {
  background: var(--clr-accent-bg);
}

.traceability-table td:first-child {
  font-weight: 700;
  white-space: nowrap;
  color: var(--clr-accent);
  font-size: 0.8125rem;
}

/* ─── Theme toggle button ─────────────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--clr-surface);
  color: var(--clr-text-soft);
  border: 1px solid var(--clr-border);
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition);
}

.theme-toggle:hover {
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
  border-color: var(--clr-accent-ring);
  box-shadow: var(--shadow-md);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--clr-accent-ring);
  outline-offset: 2px;
}

/* ─── Demo notice banner ──────────────────────────────────────────────── */
.demo-notice {
  background: var(--clr-warn-bg);
  border: 1px solid var(--clr-conf-likely-bd);
  border-left: 4px solid var(--clr-warn);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 16px;
  font-size: 0.875rem;
  color: var(--clr-warn);
  line-height: 1.55;
}

.demo-notice strong {
  display: block;
  font-size: 0.9375rem;
  margin-bottom: 6px;
}

.demo-notice p {
  margin: 0;
  color: var(--clr-text-soft);
}

.demo-result-heading {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.demo-finding-card {
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-bottom: 10px;
}

.demo-finding-card:last-child {
  margin-bottom: 0;
}

.demo-finding-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.demo-finding-type {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--clr-text);
}

.demo-conf-badge {
  flex-shrink: 0;
}

/* Confidence-specific badge colours */
.req-badge--conf-confirmed {
  background: var(--clr-conf-confirmed-bg);
  color: var(--clr-conf-confirmed);
  border-color: var(--clr-conf-confirmed-bd);
}

.req-badge--conf-likely {
  background: var(--clr-conf-likely-bg);
  color: var(--clr-conf-likely);
  border-color: var(--clr-conf-likely-bd);
}

.req-badge--conf-possible {
  background: var(--clr-conf-possible-bg);
  color: var(--clr-conf-possible);
  border-color: var(--clr-conf-possible-bd);
}

.req-badge--conf-informational {
  background: var(--clr-conf-info-bg);
  color: var(--clr-conf-info);
  border-color: var(--clr-conf-info-bd);
}

.demo-finding-req {
  font-size: 0.8125rem;
  color: var(--clr-text-muted);
  font-style: italic;
  margin-bottom: 10px;
  line-height: 1.5;
}

/* ─── Demo mode panel ─────────────────────────────────────────────────── */
.demo-panel {
  margin-top: 20px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-soft);
  border-left: 4px solid var(--clr-conf-possible);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  box-shadow: var(--shadow-md);
}

.demo-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--clr-border-soft);
}

.demo-panel-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--clr-conf-possible);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 7px;
}

.demo-panel-title::before {
  content: '⚡';
  font-size: 0.875rem;
}

/* ─── Demo per-requirement sections ───────────────────────────────────── */
.demo-req-section {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--clr-border-soft);
}

.demo-req-section:first-of-type {
  margin-top: 12px;
  padding-top: 0;
  border-top: none;
}

.demo-req-heading {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--clr-conf-possible);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.demo-req-text {
  font-size: 0.875rem;
  color: var(--clr-text-soft);
  line-height: 1.55;
  margin-bottom: 14px;
  padding: 10px 14px;
  background: var(--clr-surface-alt);
  border: 1px solid var(--clr-border-soft);
  border-radius: var(--radius-sm);
}

.demo-sub-heading {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin: 14px 0 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--clr-border-soft);
}

/* ─── Test case classification tags ───────────────────────────────────── */
.tc-classification {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 100px;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  vertical-align: middle;
  margin-right: 4px;
  border: 1px solid transparent;
}

.tc-classification--positive {
  background: var(--clr-conf-confirmed-bg);
  color: var(--clr-conf-confirmed);
  border-color: var(--clr-conf-confirmed-bd);
}

.tc-classification--negative {
  background: var(--clr-error-bg);
  color: var(--clr-error);
  border-color: var(--clr-error-bdr);
}

.tc-classification--edge {
  background: var(--clr-conf-possible-bg);
  color: var(--clr-conf-possible);
  border-color: var(--clr-conf-possible-bd);
}

/* ─── Demo "select a requirement" prompt ─────────────────────────────── */
.demo-select-prompt {
  margin-top: 16px;
  padding: 14px 18px;
  background: var(--clr-accent-bg);
  border: 1px solid var(--clr-accent-ring);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--clr-text-soft);
  font-style: italic;
}

/* ─── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 52px;
  }

  .sidebar-brand,
  .sidebar-section-label,
  .sidebar-label {
    display: none;
  }

  .sidebar-item {
    justify-content: center;
    padding: 10px 0;
    border-left: none !important;
  }

  .sidebar-icon {
    width: 18px;
    height: 18px;
  }
}

@media (max-width: 600px) {
  .view {
    padding: 20px 16px 40px;
  }

  .req-detail {
    padding: 16px;
  }

  .result-card {
    padding: 16px 18px;
  }

  .traceability-table th,
  .traceability-table td {
    padding: 9px 12px;
  }

  .analyze-btn-row {
    flex-direction: column;
  }

  .analyze-btn-main {
    width: 100%;
  }

  .btn-demo {
    width: 100%;
    justify-content: center;
  }

  .demo-panel {
    padding: 16px;
  }

  .demo-req-text {
    padding: 8px 12px;
  }
}