.gini-card {
  --gini-surface: #ffffff;
  --gini-soft: #f4f7f5;
  --gini-ink: #243029;
  --gini-muted: #617068;
  --gini-line: #cdd8d1;
  --gini-a: #2f9e44;
  --gini-a-soft: #dff3e4;
  --gini-b: #d97706;
  --gini-b-soft: #fbe8cc;
  --gini-entropy: #7048e8;
  --gini-error: #e03131;
  --gini-accent: #2b8a3e;
  --gini-black-bean: #1e2421;
  --gini-black-bean-rim: rgba(0, 0, 0, 0.22);
  box-sizing: border-box;
  width: 100%;
  padding: 1rem;
  color: var(--gini-ink);
  background: var(--gini-surface);
  border: 1px solid var(--gini-line);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(31, 48, 39, 0.08);
  margin-bottom: 1.5rem;
}

[theme="dark"] .gini-card {
  --gini-surface: #202523;
  --gini-soft: #29302c;
  --gini-ink: #edf3ef;
  --gini-muted: #aab8b0;
  --gini-line: #3d4942;
  --gini-a: #69db7c;
  --gini-a-soft: #1f4930;
  --gini-b: #ffa94d;
  --gini-b-soft: #50381d;
  --gini-entropy: #b197fc;
  --gini-error: #ff8787;
  --gini-accent: #40c057;
  --gini-black-bean: #0e1210;
  --gini-black-bean-rim: rgba(255, 255, 255, 0.4);
  box-shadow: none;
}

.gini-card * {
  box-sizing: border-box;
}

.gini-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.gini-head h3 {
  margin: 0.1rem 0 0;
  color: var(--gini-ink);
  font-size: 1.05rem;
  line-height: 1.35;
}

.gini-eyebrow {
  margin: 0;
  color: var(--gini-muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.11em;
}

.gini-button {
  flex: 0 0 auto;
  padding: 0.55rem 0.8rem;
  color: #fff;
  background: #2b8a3e;
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease;
}

.gini-button:hover {
  background: #237234;
}

.gini-button:focus-visible,
.gini-card input:focus-visible,
.gini-card select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--gini-accent) 55%, transparent);
  outline-offset: 2px;
}

.gini-control {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
}

.gini-control span {
  display: flex;
  justify-content: space-between;
  color: var(--gini-ink);
}

.gini-control output {
  color: var(--gini-accent);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.gini-control input[type="range"] {
  width: 100%;
  accent-color: var(--gini-accent);
}

.gini-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.gini-metrics > div {
  padding: 0.55rem 0.65rem;
  background: var(--gini-soft);
  border: 1px solid var(--gini-line);
  border-radius: 10px;
}

.gini-metrics span {
  display: block;
  color: var(--gini-muted);
  font-size: 0.7rem;
  line-height: 1.25;
}

.gini-metrics strong {
  display: block;
  margin-top: 0.2rem;
  color: var(--gini-ink);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}

.gini-canvas-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  background: var(--gini-soft);
  border: 1px solid var(--gini-line);
  border-radius: 12px;
  overflow: hidden;
}

.gini-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.gini-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: 0.65rem;
  font-size: 0.74rem;
  color: var(--gini-muted);
}

.gini-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.gini-legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.gini-legend i.class-a {
  background: var(--gini-a);
}

.gini-legend i.class-b {
  background: var(--gini-b);
}

.gini-legend i.bean-black {
  background: var(--gini-black-bean);
  border: 1px solid var(--gini-black-bean-rim);
}

.gini-legend i.curve-gini {
  background: var(--gini-a);
  border-radius: 2px;
  height: 3px;
  width: 14px;
}

.gini-legend i.curve-entropy {
  background: var(--gini-entropy);
  border-radius: 2px;
  height: 3px;
  width: 14px;
}

.gini-legend i.curve-error {
  background: var(--gini-error);
  border-radius: 2px;
  height: 3px;
  width: 14px;
}

.gini-hint,
.gini-caption {
  margin: 0.65rem 0 0;
  color: var(--gini-muted);
  font-size: 0.78rem;
  line-height: 1.45;
  text-align: center;
}

.gini-balls-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px;
  justify-content: center;
  align-items: center;
}

.gini-ball {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.gini-ball.class-a {
  background: var(--gini-a);
}

.gini-ball.class-b {
  background: var(--gini-b);
}

.gini-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.gini-badge.badge-optimal {
  background: var(--gini-a-soft);
  color: var(--gini-a);
}

.gini-badge.badge-suboptimal {
  background: var(--gini-b-soft);
  color: var(--gini-b);
}

.gini-badge.badge-random {
  background: rgba(224, 49, 49, 0.12);
  color: var(--gini-error);
}

.doer-verdict-box {
  margin-top: 0.7rem;
  padding: 0.6rem 0.85rem;
  border-radius: 10px;
  font-size: 0.8rem;
  line-height: 1.45;
  background: var(--gini-soft);
  border-left: 3.5px solid var(--gini-accent);
  transition: border-color 0.25s ease;
}

.doer-btn-group {
  display: inline-flex;
  gap: 0.35rem;
  background: var(--gini-soft);
  padding: 3px;
  border-radius: 10px;
  border: 1px solid var(--gini-line);
}

.doer-btn {
  padding: 0.45rem 0.75rem;
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--gini-muted);
  background: transparent;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.doer-btn:hover {
  color: var(--gini-ink);
  background: color-mix(in srgb, var(--gini-accent) 15%, transparent);
}

.doer-btn.active {
  color: #ffffff;
  background: var(--gini-accent);
  font-weight: 700;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
}

/* ==========================================================================
   2x2 Contingency Table (Bảng tiếp liên) Styles
   ========================================================================== */

.ct-preset-btn {
  padding: 0.45rem 0.75rem;
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--gini-muted);
  background: transparent;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.18s ease;
  white-space: nowrap;
}

.ct-preset-btn:hover {
  color: var(--gini-ink);
  background: color-mix(in srgb, var(--gini-accent) 15%, transparent);
}

.ct-preset-btn.active {
  color: #ffffff;
  background: var(--gini-accent);
  font-weight: 700;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
}

.ct-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 0.9rem 0 0.75rem;
  border: 1px solid var(--gini-line);
  border-radius: 12px;
  background: var(--gini-surface);
}

.ct-table {
  width: 100%;
  min-width: 360px;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: center;
}

.ct-table th,
.ct-table td {
  padding: 0.65rem 0.55rem;
  border: 1px solid var(--gini-line);
}

.ct-th-corner {
  background: var(--gini-soft);
  color: var(--gini-muted);
  font-size: 0.72rem;
  font-weight: 600;
  width: 28%;
  vertical-align: middle;
  line-height: 1.35;
}

.ct-th-col {
  background: var(--gini-soft);
  width: 36%;
}

.ct-th-row {
  background: var(--gini-soft);
  text-align: left;
  padding-left: 0.75rem;
}

.ct-th-header {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  color: var(--gini-ink);
  font-size: 0.82rem;
  justify-content: center;
}

.ct-th-row .ct-th-header {
  justify-content: flex-start;
}

.ct-th-prob {
  font-size: 0.72rem;
  color: var(--gini-muted);
  margin-top: 0.2rem;
  font-weight: 500;
}

.ct-th-marginal {
  background: color-mix(in srgb, var(--gini-soft) 80%, var(--gini-line));
  font-size: 0.72rem;
  color: var(--gini-muted);
  font-weight: 600;
  width: 14%;
}

.ct-cell {
  position: relative;
  vertical-align: middle;
  transition: all 0.2s ease;
}

.ct-cell-top {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  margin-bottom: 0.3rem;
}

.ct-cell-id {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--gini-muted);
  font-family: monospace;
}

.ct-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.15rem 0.4rem;
  border-radius: 999px;
  line-height: 1.2;
}

.ct-badge-correct {
  background: var(--gini-a-soft);
  color: var(--gini-a);
}

.ct-badge-error {
  background: var(--gini-b-soft);
  color: var(--gini-b);
  border: 1px solid color-mix(in srgb, var(--gini-b) 30%, transparent);
}

.ct-cell-formula {
  font-size: 0.78rem;
  color: var(--gini-muted);
  font-family: inherit;
  margin-bottom: 0.2rem;
}

.ct-cell-calc {
  font-size: 0.74rem;
  color: var(--gini-muted);
  opacity: 0.85;
  font-family: monospace;
}

.ct-cell-val {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--gini-ink);
  margin-top: 0.25rem;
}

.ct-val-error {
  color: var(--gini-b);
}

/* Correct cells: Subtle green */
.ct-cell-correct {
  background: color-mix(in srgb, var(--gini-a-soft) 35%, transparent);
}

/* Error cells: Distinct amber/orange glow & border highlighting Gini Impurity */
.ct-cell-error {
  background: color-mix(in srgb, var(--gini-b-soft) 55%, transparent);
  outline: 2px solid var(--gini-b);
  outline-offset: -2px;
}

.ct-cell-marginal {
  background: var(--gini-soft);
  font-size: 0.75rem;
  color: var(--gini-ink);
  font-weight: 600;
}

.ct-marginal-formula {
  display: block;
  font-size: 0.65rem;
  color: var(--gini-muted);
  margin-bottom: 0.15rem;
  font-weight: normal;
}

.ct-cell-total {
  background: color-mix(in srgb, var(--gini-soft) 50%, var(--gini-surface));
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--gini-ink);
}

.ct-total-label {
  display: block;
  font-size: 0.65rem;
  color: var(--gini-muted);
  font-weight: normal;
}

/* Summary Grid */
.ct-summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: 0.65rem;
}

@media (max-width: 580px) {
  .ct-summary-grid {
    grid-template-columns: 1fr;
  }
}

.ct-summary-card {
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  background: var(--gini-soft);
  border: 1px solid var(--gini-line);
}

.ct-card-correct {
  border-left: 3.5px solid var(--gini-a);
}

.ct-card-gini {
  border-left: 3.5px solid var(--gini-b);
  background: color-mix(in srgb, var(--gini-b-soft) 40%, var(--gini-soft));
}

.ct-sum-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--gini-ink);
}

.ct-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.dot-correct {
  background: var(--gini-a);
}

.dot-gini {
  background: var(--gini-b);
}

.ct-sum-formula {
  font-size: 0.72rem;
  color: var(--gini-muted);
  margin-top: 0.2rem;
}

.ct-sum-value {
  font-size: 0.88rem;
  margin-top: 0.35rem;
  color: var(--gini-ink);
}

.ct-sum-value strong {
  font-size: 1.15rem;
}

.ct-card-gini .ct-sum-value strong {
  color: var(--gini-b);
}

.ct-explanation-callout {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin-top: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  font-size: 0.78rem;
  line-height: 1.45;
  background: var(--gini-soft);
  color: var(--gini-ink);
  border: 1px dashed var(--gini-line);
}

.ct-explanation-callout i {
  color: var(--gini-b);
  font-size: 0.95rem;
  margin-top: 0.15rem;
  flex-shrink: 0;
}