/* ── Design System ──────────────────────────────────────────────── */
:root {
  --bg:           #eef1f7;
  --surface:      #ffffff;
  --surface-2:    #f0f3f8;
  --border:       rgba(0,0,0,0.06);
  --border-hover: rgba(0,0,0,0.16);

  --text-primary:   #0a0e1a;
  --text-secondary: #2d3748;
  --text-muted:     #64748b;

  --accent-blue:   #2563eb;
  --accent-purple: #7c3aed;
  --accent-green:  #16a34a;
  --accent-red:    #dc2626;
  --accent-yellow: #d97706;
  --accent-orange: #ea580c;
  --amber-label:   #a16207;

  --low-color:  #ef4444;
  --med-color:  #f59e0b;
  --high-color: #22c55e;

  /* All three resolve to DM Sans — unified sans-serif system */
  --font-display: 'DM Sans', sans-serif;
  --font-body:    'DM Sans', sans-serif;
  --font-mono:    'DM Sans', sans-serif;

  --radius:    12px;
  --radius-sm: 6px;
  --shadow:    0 1px 8px rgba(0,0,0,0.07);
  --shadow-lg: 0 6px 22px rgba(0,0,0,0.13);

  --focus-ring: 0 0 0 3px color-mix(in srgb, var(--accent-blue) 32%, transparent);

  --ease:       cubic-bezier(0.2, 0, 0, 1);
  --ease-out:   cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg:           #0f1117;
  --surface:      #161b27;
  --surface-2:    #1e2436;
  --border:       rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.15);
  --shadow:       0 1px 10px rgba(0,0,0,0.35);
  --shadow-lg:    0 10px 32px rgba(0,0,0,0.55);
  --focus-ring:   0 0 0 3px color-mix(in srgb, var(--accent-blue) 40%, transparent);

  --text-primary:   #f0f2f8;
  --text-secondary: #94a3b8;
  --text-muted:     #7c8ca0;

  --accent-blue:   #4C8EF5;
  --accent-purple: #a78bfa;
  --accent-green:  #34d399;
  --accent-red:    #F87171;
  --accent-yellow: #fbbf24;
  --accent-orange: #fb923c;
  --amber-label:   #fbbf24;

  --low-color:  #F87171;
  --med-color:  #fbbf24;
  --high-color: #34d399;
}

/* ── Reset & Base ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text-primary);
  font-size: 13px;
  display: flex;
  flex-direction: column;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Keyboard focus — accessible ring on every interactive element */
button:focus-visible,
.chip:focus-visible,
.chart-select:focus-visible,
select:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

/* Honor the user's motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── Header ─────────────────────────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 12px;
}
.header-left { min-width: 0; }
.header-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  white-space: nowrap;
}
.header-title em { font-style: italic; color: var(--accent-blue); }
.header-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
  display: block;
  margin-top: 2px;
}
.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.divider-v {
  width: 1px;
  height: 24px;
  background: var(--border);
}
.view-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* Subject toggle */
.subject-toggle {
  display: flex;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}
.subj-btn {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  white-space: nowrap;
}
.subj-btn.active {
  background: var(--surface);
  color: var(--text-primary);
  box-shadow: var(--shadow);
}
.subj-btn:hover:not(.active) { color: var(--text-secondary); }

/* View switcher */
.view-switcher {
  display: flex;
  gap: 4px;
}
.view-btn {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  padding: 5px 10px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
  white-space: nowrap;
}
.view-btn.active {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: color-mix(in srgb, var(--accent-blue) 8%, transparent);
}
.view-btn:hover:not(.active) {
  border-color: var(--border-hover);
  color: var(--text-secondary);
}

/* Dark mode toggle */
.icon-btn {
  width: 32px; height: 32px;
  border: 1px solid var(--border);
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
  flex-shrink: 0;
}
.icon-btn:hover { background: var(--surface-2); }
.icon-btn:hover { border-color: var(--border-hover); color: var(--text-secondary); }
.icon-btn svg { width: 15px; height: 15px; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="dark"]  .icon-moon { display: none; }

/* ── KPI Bar ─────────────────────────────────────────────────────── */
.kpi-bar {
  display: flex;
  align-items: stretch;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  padding: 0 16px;
}
.kpi-sep {
  width: 1px;
  background: var(--border);
  margin: 8px 0;
}
.kpi-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10px 20px;
  flex: 1;
  position: relative;
  transition: background 0.2s var(--ease);
}
.kpi-item:hover { background: color-mix(in srgb, var(--text-muted) 5%, transparent); }
.kpi-item--accent:hover { background: color-mix(in srgb, var(--accent-red) 9%, transparent); }
.kpi-item--accent { background: color-mix(in srgb, var(--accent-red) 5%, transparent); }
.kpi-label {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}
.kpi-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  margin-top: 2px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.kpi-value--sm { font-size: 14px; font-family: var(--font-body); font-weight: 600; }
.kpi-unit { font-size: 14px; color: var(--text-muted); }

/* ── Controls Bar (Insight + Chips) ─────────────────────────────── */
.controls-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.insight-strip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  flex-shrink: 0;
  min-width: 280px;
}
.insight-icon { color: var(--accent-blue); font-size: 8px; }
.insight-label { font-weight: 700; color: var(--text-secondary); letter-spacing: 0.04em; text-transform: uppercase; }
.insight-stat { font-weight: 600; color: var(--accent-blue); }
.insight-desc { color: var(--text-muted); }

.chip-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
  overflow-x: auto;
}
.chip {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 20px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease-out);
  white-space: nowrap;
  user-select: none;
}
.chip:hover { transform: translateY(-1px); }
.chip:active { transform: translateY(0); }
.chip.inactive {
  background: var(--surface-2);
  color: var(--text-muted);
  border-color: var(--border);
}
.chip.inactive:hover { border-color: var(--border-hover); color: var(--text-secondary); }

/* ── Main Grid ───────────────────────────────────────────────────── */
main {
  flex: 1;
  min-height: 0;
  padding: 6px;
  overflow: hidden;
}
/* 24-unit grid: row-1 = 7|10|7 (1.75:2.5:1.75), row-2 = 8|8|8 (2:2:2) */
.grid {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  grid-template-rows: 1fr 1fr;
  gap: 6px;
  height: 100%;
}
/* Row 1 — scatter centered, widest column */
#card-importance { grid-column:  1 /  8; grid-row: 1; }
#card-scatter    { grid-column:  8 / 18; grid-row: 1; }
#card-radar      { grid-column: 18 / 25; grid-row: 1; }
/* Row 2 — equal thirds */
#card-bar        { grid-column:  1 /  9; grid-row: 2; }
#card-env        { grid-column:  9 / 17; grid-row: 2; }
#card-extra      { grid-column: 17 / 25; grid-row: 2; }

/* ── Card ────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}
.card-header {
  padding: 10px 14px 6px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.card-header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.card-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 2px;
}
.card-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}
.card-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  padding: 3px 7px;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}
.card-badge-amber {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  color: var(--amber-label);
  background: color-mix(in srgb, var(--amber-label) 10%, transparent);
  border-radius: 4px;
  padding: 3px 7px;
  margin-top: 5px;
}
.card-hint {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 2px;
}
.header-legend {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
  flex-shrink: 0;
}
.card-header-sub {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}
#scatter-stat {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
}
#scatter-legend {
  display: flex;
  align-items: center;
  gap: 14px;
}
.scatter-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-secondary);
}
.scatter-legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.card-body {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

/* ── Chart controls ──────────────────────────────────────────────── */
.chart-select {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  cursor: pointer;
  flex-shrink: 0;
  outline: none;
}
.chart-select:focus { border-color: var(--accent-blue); }

.toggle-group {
  display: flex;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
  flex-shrink: 0;
}
.tgl-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.tgl-btn:hover:not(.active) { color: var(--text-secondary); }
.tgl-btn.active {
  background: var(--surface);
  color: var(--text-primary);
  box-shadow: var(--shadow);
}

/* ── Tooltip ─────────────────────────────────────────────────────── */
#tooltip {
  position: fixed;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.16s var(--ease-out);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  max-width: 230px;
  min-width: 160px;
  font-variant-numeric: tabular-nums;
}
.tt-header {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  margin-bottom: 6px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.02em;
}
.tt-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 10px;
  font-size: 11px;
}
.tt-label { color: var(--text-muted); }
.tt-val { font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--text-primary); text-align: right; }
.tt-badge {
  margin-top: 6px;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  display: inline-block;
}
.tt-badge.risk  { background: color-mix(in srgb, var(--accent-red) 12%, transparent);   color: var(--accent-red); }
.tt-badge.pass  { background: color-mix(in srgb, var(--accent-green) 12%, transparent); color: var(--accent-green); }

/* ── SVG chart helpers ───────────────────────────────────────────── */
.axis path, .axis line { stroke: var(--border); }
.axis text { fill: var(--text-muted); font-family: var(--font-mono); font-size: 10.5px; font-variant-numeric: tabular-nums; }
.grid-line { stroke: var(--border); stroke-dasharray: 3,4; stroke-width: 0.8; }

/* Scatter dots */
.dot {
  transition: r 0.1s, opacity 0.1s;
  cursor: crosshair;
}
.dot:hover { r: 5; }

/* Lollipop */
.lollipop-line { stroke-width: 1.5; }
.lollipop-dot { cursor: pointer; transition: r 0.12s; }
.lollipop-dot:hover { r: 6.5; }
.lollipop-dot.active-field { r: 7; stroke-width: 2.5; stroke: var(--text-primary); }

/* Persona bars */
.persona-bar-bg { fill: var(--surface-2); rx: 3; }
.persona-bar-fill { rx: 3; transition: width 0.4s ease; }

/* Confusion matrix */
.cm-cell { rx: 6; }
.cm-cell-label { font-family: var(--font-display); font-size: 22px; font-weight: 400; }
.cm-cell-sub { font-family: var(--font-mono); font-size: 9px; font-weight: 600; }

/* Histogram */
.hist-bar { transition: opacity 0.15s; cursor: default; }
.hist-bar:hover { opacity: 0.8; }
.kde-line { fill: none; stroke-width: 2; }
.threshold-line { stroke-dasharray: 5, 4; stroke-width: 1.5; }

/* Progression chart */
.spaghetti-line { fill: none; pointer-events: none; }
.mean-line { fill: none; stroke-width: 3; }
.std-band { opacity: 0.12; }
.mean-dot { cursor: default; }
.period-label { font-family: var(--font-mono); font-weight: 600; }

/* Regression line */
.reg-line { fill: none; stroke-dasharray: 6,3; stroke-width: 1.5; opacity: 0.7; }
.r2-label { font-family: var(--font-mono); font-size: 10px; }

/* ── Scrollbar suppression ───────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 2px; }
::-webkit-scrollbar-track { background: transparent; }

/* ── Transitions ─────────────────────────────────────────────────── */
.card {
  transition: box-shadow 0.25s var(--ease-out), transform 0.25s var(--ease-out), border-color 0.2s var(--ease);
  will-change: transform;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  border-color: var(--border-hover);
}