/* =============================================================================
   knowledge-rag — Live Performance Dashboard
   Executive-focused design system. Dark mode by default (matches modern
   developer tooling), light mode auto-switches via prefers-color-scheme.
   No framework. No web fonts. Zero runtime cost.
   ============================================================================= */

:root {
  /* Neutrals — dark theme */
  --bg:            #0b1220;
  --bg-elev-1:     #131c30;
  --bg-elev-2:     #1a2540;
  --border:        #1f2b47;
  --border-strong: #2d3b5f;
  --text:          #e6ecf7;
  --text-muted:    #9aa8c4;
  --text-dim:      #6c7a99;

  /* Accents — brand + status */
  --accent:        #38bdf8;   /* cyan-400 */
  --accent-strong: #0ea5e9;   /* cyan-500 */
  --brand:         #a78bfa;   /* violet-400 */
  --success:       #22c55e;
  --warning:       #f59e0b;
  --danger:        #ef4444;

  /* Chart palette (used by dashboard.js) */
  --chart-series-1: #38bdf8;
  --chart-series-2: #a78bfa;
  --chart-series-3: #22c55e;
  --chart-series-4: #f59e0b;
  --chart-series-5: #ef4444;
  --chart-series-6: #f472b6;

  /* Radii + shadows */
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.15);
  --shadow:    0 4px 12px rgba(0,0,0,.25);
  --shadow-lg: 0 20px 40px -12px rgba(0,0,0,.4);

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", Menlo, Consolas,
               monospace;

  /* Motion */
  --transition: 180ms cubic-bezier(.4,0,.2,1);
}

/* Light mode override */
@media (prefers-color-scheme: light) {
  :root[data-theme="auto"] {
    --bg:            #f8fafc;
    --bg-elev-1:     #ffffff;
    --bg-elev-2:     #f1f5f9;
    --border:        #e2e8f0;
    --border-strong: #cbd5e1;
    --text:          #0f172a;
    --text-muted:    #475569;
    --text-dim:      #94a3b8;
    --shadow-sm: 0 1px 2px rgba(15,23,42,.06);
    --shadow:    0 4px 12px rgba(15,23,42,.08);
    --shadow-lg: 0 20px 40px -12px rgba(15,23,42,.15);
  }
}

/* Explicit theme forcing (set by dashboard.js on the html element) */
:root[data-theme="light"] {
  --bg:            #f8fafc;
  --bg-elev-1:     #ffffff;
  --bg-elev-2:     #f1f5f9;
  --border:        #e2e8f0;
  --border-strong: #cbd5e1;
  --text:          #0f172a;
  --text-muted:    #475569;
  --text-dim:      #94a3b8;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06);
  --shadow:    0 4px 12px rgba(15,23,42,.08);
  --shadow-lg: 0 20px 40px -12px rgba(15,23,42,.15);
}

/* =============================================================================
   Reset + base
   ============================================================================= */

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.55;
}

body {
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-strong); text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-elev-2);
  color: var(--brand);
  padding: 0.1em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 clamp(1rem, 3vw, 2rem); }

/* =============================================================================
   Hero
   ============================================================================= */

.hero {
  background:
    radial-gradient(1200px 400px at 15% -10%, rgba(56,189,248,.10), transparent 60%),
    radial-gradient(900px 350px at 85% 10%, rgba(167,139,250,.10), transparent 60%),
    var(--bg-elev-1);
  border-bottom: 1px solid var(--border);
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(1.5rem, 4vw, 2.5rem);
}

.hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark {
  font-size: 2.5rem;
  line-height: 1;
  filter: drop-shadow(0 4px 8px rgba(56,189,248,.35));
}

.hero h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.hero-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-nav a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.hero-nav a:hover { color: var(--text); background: var(--bg-elev-2); text-decoration: none; }

.theme-toggle {
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.7rem;
  cursor: pointer;
  font-size: 1rem;
  color: var(--text);
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--border); border-color: var(--border-strong); }

.hero-lede {
  max-width: 780px;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0 0 1.5rem;
}
.hero-lede code {
  font-size: 0.85em;
}

.hero-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.meta-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.meta-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 600;
}

/* =============================================================================
   Sections
   ============================================================================= */

main {
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.section-title {
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 700;
  margin: 0 0 0.4rem;
  letter-spacing: -0.02em;
  color: var(--text);
}
.section-lede {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0 0 1.5rem;
  max-width: 720px;
}

/* =============================================================================
   KPI cards
   ============================================================================= */

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.kpi-card {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.kpi-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--kpi-accent, var(--accent));
  opacity: 0.9;
}
.kpi-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.kpi-card--skeleton { opacity: 0.4; }

.kpi-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.kpi-value {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.kpi-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.kpi-status {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}
.kpi-status--good    { background: rgba(34,197,94,.15);  color: var(--success); }
.kpi-status--warn    { background: rgba(245,158,11,.15); color: var(--warning); }
.kpi-status--danger  { background: rgba(239,68,68,.15);  color: var(--danger); }
.kpi-status--neutral { background: var(--bg-elev-2);     color: var(--text-muted); }

/* =============================================================================
   Chart wrap
   ============================================================================= */

.chart-wrap {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  min-height: 380px;
  position: relative;
}
#latency-chart {
  max-height: 480px;
}

/* =============================================================================
   Category breakdown
   ============================================================================= */

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.category-card {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  cursor: pointer;
  transition: all var(--transition);
  border-left: 3px solid var(--cat-color, var(--accent));
}
.category-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}
.category-card--skeleton { opacity: 0.4; cursor: default; }

.cat-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}
.cat-stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.cat-stats span {
  display: flex;
  gap: 0.3rem;
  align-items: baseline;
}
.cat-stats strong {
  font-family: var(--font-mono);
  color: var(--text);
  font-weight: 600;
}

/* =============================================================================
   Table
   ============================================================================= */

.table-controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
#table-filter, #category-filter {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 0.55rem 0.85rem;
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
#table-filter { flex: 1; min-width: 200px; }
#category-filter { min-width: 180px; }
#table-filter:focus, #category-filter:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56,189,248,.15);
}

.table-wrap {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.results-table thead th {
  position: sticky;
  top: 0;
  background: var(--bg-elev-2);
  color: var(--text);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-strong);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: background var(--transition);
}
.results-table thead th:hover { background: var(--border); }
.results-table thead th.numeric { text-align: right; }
.results-table thead th.sorted-asc::after  { content: " ↑"; opacity: 0.7; }
.results-table thead th.sorted-desc::after { content: " ↓"; opacity: 0.7; }

.results-table tbody td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.results-table tbody tr:last-child td { border-bottom: none; }
.results-table tbody tr:hover { background: var(--bg-elev-2); }
.results-table tbody .numeric {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: right;
}
.results-table .cat-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--bg-elev-2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.loading {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
  font-style: italic;
}
.empty {
  text-align: center;
  color: var(--text-dim);
  padding: 2rem;
}

/* =============================================================================
   Methodology
   ============================================================================= */

.methodology {
  background: var(--bg-elev-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
}
.methodology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}
.methodology h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.75rem;
}
.methodology ul {
  padding-left: 1.2rem;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.65;
}
.methodology li { margin-bottom: 0.4rem; }

/* =============================================================================
   Footer
   ============================================================================= */

.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  margin-top: 2rem;
  background: var(--bg-elev-1);
}
.footer p {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin: 0;
  text-align: center;
}

/* =============================================================================
   Responsive
   ============================================================================= */

@media (max-width: 640px) {
  .hero-top { flex-direction: column; align-items: flex-start; }
  .hero-nav { width: 100%; justify-content: flex-start; overflow-x: auto; }
  .hero-meta { gap: 1rem; }
  .kpi-grid { grid-template-columns: 1fr; }
  .table-controls { flex-direction: column; }
  #table-filter, #category-filter { width: 100%; }
  .results-table thead th, .results-table tbody td { padding: 0.55rem 0.7rem; }
}

/* Print — helpful when execs export the page */
@media print {
  .hero-nav, .table-controls, .theme-toggle { display: none; }
  body { background: white; color: black; }
  .kpi-card, .chart-wrap, .table-wrap, .methodology, .category-card {
    box-shadow: none;
    border: 1px solid #999;
    break-inside: avoid;
  }
}

/* Motion respect */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}