:root {
  --primary: 37 99 235;
  --secondary: 244 63 94;
  --ink: 17 24 39;
}

.bg-primary { background-color: rgb(var(--primary) / var(--tw-bg-opacity, 1)); }
.text-primary { color: rgb(var(--primary) / 1); }
.border-primary { border-color: rgb(var(--primary) / 1); }
.bg-secondary { background-color: rgb(var(--secondary) / var(--tw-bg-opacity, 1)); }
.text-secondary { color: rgb(var(--secondary) / 1); }
.border-secondary { border-color: rgb(var(--secondary) / 1); }

.guide-step,
.concept-flow-card,
.metric-tile,
.bridge-card,
.takeaway-card {
  border: 1px solid rgba(17, 24, 39, 0.08);
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.04);
}

.guide-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px;
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 1), rgba(248, 250, 252, 0.96));
}

.guide-step-index,
.trajectory-index {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgb(var(--primary));
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.guide-step-title,
.concept-flow-title,
.bridge-card-title,
.takeaway-title {
  font-size: 15px;
  font-weight: 700;
  color: rgba(var(--ink), 0.95);
}

.guide-step-copy,
.concept-flow-copy,
.bridge-card-copy,
.takeaway-copy {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(var(--ink), 0.65);
  margin-top: 4px;
}

.concept-flow-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px;
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(248, 250, 252, 1), rgba(255, 255, 255, 0.92));
}

.concept-flow-icon,
.bridge-card-icon,
.takeaway-icon {
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.14), rgba(244, 63, 94, 0.12));
  color: rgb(var(--primary));
  font-size: 20px;
}

.mini-stat-card {
  border: 1px solid rgba(17, 24, 39, 0.08);
  border-radius: 18px;
  background: #f8fafc;
  padding: 14px;
  text-align: center;
}

.mini-stat-value {
  font-size: 26px;
  line-height: 1;
  font-weight: 800;
  color: rgba(var(--ink), 0.92);
}

.mini-stat-label {
  margin-top: 6px;
  font-size: 12px;
  color: rgba(var(--ink), 0.58);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  color: rgb(var(--primary));
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.legend-chip,
.line-swatch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid rgba(17, 24, 39, 0.08);
  color: rgba(var(--ink), 0.65);
  font-size: 12px;
  font-weight: 600;
}

.line-swatch::before {
  content: "";
  width: 18px;
  height: 3px;
  border-radius: 999px;
  background: var(--swatch);
}

.control-select,
.control-button,
input[type="range"],
input[type="number"] {
  width: 100%;
}

.control-select,
input[type="number"] {
  border: 1px solid rgba(17, 24, 39, 0.12);
  border-radius: 16px;
  padding: 12px 14px;
  background: #fff;
  color: rgba(var(--ink), 0.9);
}

.control-select:focus,
input[type="number"]:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.35);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.08);
}

.control-value {
  font-size: 12px;
  font-weight: 700;
  color: rgba(var(--ink), 0.62);
  background: #f8fafc;
  border: 1px solid rgba(17, 24, 39, 0.08);
  border-radius: 999px;
  padding: 5px 10px;
}

.control-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background 180ms ease;
}

.control-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.control-button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.control-button-primary {
  background: rgb(var(--primary));
  color: #fff;
}

.control-button-secondary {
  background: rgba(37, 99, 235, 0.08);
  color: rgb(var(--primary));
  border-color: rgba(37, 99, 235, 0.12);
}

.control-button-ghost {
  background: #fff;
  color: rgba(var(--ink), 0.78);
  border-color: rgba(17, 24, 39, 0.1);
}

.toggle {
  position: relative;
  width: 52px;
  height: 30px;
  flex-shrink: 0;
}

.toggle input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.toggle-track {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.45);
  transition: background 180ms ease;
  position: relative;
}

.toggle-track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: #fff;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.18);
  transition: transform 180ms ease;
}

.toggle input:checked + .toggle-track {
  background: rgba(37, 99, 235, 0.4);
}

.toggle input:checked + .toggle-track::after {
  transform: translateX(22px);
}

.toggle input:focus-visible + .toggle-track {
  outline: 3px solid rgba(37, 99, 235, 0.14);
  outline-offset: 3px;
}

.option-chip {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: #f8fafc;
}

.option-chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.option-chip-box {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  border-radius: 6px;
  border: 1.5px solid rgba(17, 24, 39, 0.18);
  background: #fff;
  position: relative;
}

.option-chip input:checked + .option-chip-box {
  border-color: rgb(var(--primary));
  background: rgba(37, 99, 235, 0.12);
}

.option-chip input:checked + .option-chip-box::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 3px;
  background: rgb(var(--primary));
}

.metric-tile {
  padding: 18px;
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 1), rgba(248, 250, 252, 0.98));
}

.metric-label {
  font-size: 12px;
  font-weight: 700;
  color: rgba(var(--ink), 0.52);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.metric-value {
  margin-top: 8px;
  font-size: 28px;
  line-height: 1.1;
  font-weight: 800;
  color: rgba(var(--ink), 0.94);
}

.chart-shell {
  position: relative;
  height: 240px;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(241, 245, 249, 0.94)),
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 45%);
}

.chart-shell-compact {
  height: 210px;
}

.mini-chart {
  width: 100%;
  height: 100%;
  display: block;
}

.bandit-arm-row {
  padding: 16px;
  border-radius: 20px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: #f8fafc;
}

.bandit-bar-track {
  position: relative;
  margin-top: 10px;
  height: 14px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.18);
}

.bandit-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(37, 99, 235, 0.84), rgba(59, 130, 246, 0.72));
}

.bandit-bar-marker {
  position: absolute;
  top: -4px;
  bottom: -4px;
  width: 3px;
  border-radius: 999px;
  background: rgba(244, 63, 94, 0.88);
  transform: translateX(-50%);
}

.decision-log,
.trajectory-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.decision-pill,
.trajectory-node {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 14px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: #f8fafc;
  color: rgba(var(--ink), 0.74);
  font-size: 12px;
  font-weight: 600;
}

.decision-pill[data-reward="1"] {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.18);
}

.decision-mode {
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.decision-mode[data-mode="explore"] {
  background: rgba(244, 63, 94, 0.12);
  color: rgba(190, 24, 93, 0.92);
}

.decision-mode[data-mode="exploit"] {
  background: rgba(37, 99, 235, 0.12);
  color: rgb(var(--primary));
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.14);
  color: rgba(var(--ink), 0.72);
  font-size: 12px;
  font-weight: 700;
}

.status-pill[data-state="running"] {
  background: rgba(37, 99, 235, 0.12);
  color: rgb(var(--primary));
}

.bridge-panel {
  border-radius: 32px;
  padding: 32px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.1), transparent 35%),
    radial-gradient(circle at bottom left, rgba(244, 63, 94, 0.1), transparent 35%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.96));
}

.bridge-card {
  padding: 22px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
}

.math-panel {
  border-radius: 28px;
  padding: 28px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 32%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.96));
}

.math-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.math-grid-wide {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.math-card {
  padding: 20px;
  border-radius: 22px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.04);
}

.math-card-title {
  font-size: 16px;
  font-weight: 700;
  color: rgba(var(--ink), 0.94);
}

.formula-line {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(var(--ink), 0.72);
}

.formula-chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.12);
  color: rgb(var(--primary));
  font-weight: 700;
}

.math-card-copy {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(var(--ink), 0.65);
}

.gridworld-board {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.grid-cell {
  position: relative;
  min-height: 96px;
  aspect-ratio: 1 / 1;
  border-radius: 20px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  padding: 10px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #fff;
}

.grid-cell::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--cell-fill, rgba(255, 255, 255, 1));
  opacity: 1;
}

.grid-cell > * {
  position: relative;
  z-index: 1;
}

.grid-cell-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.grid-cell-type,
.grid-cell-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
}

.grid-cell-type {
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.8);
  color: rgba(var(--ink), 0.75);
  border: 1px solid rgba(17, 24, 39, 0.06);
}

.grid-cell-step {
  min-width: 24px;
  padding: 0 6px;
  background: rgb(var(--secondary));
  color: #fff;
}

.grid-cell-policy {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  font-size: 28px;
  color: rgba(var(--ink), 0.86);
}

.grid-cell-value {
  font-size: 12px;
  font-weight: 700;
  color: rgba(var(--ink), 0.76);
}

.grid-cell-wall {
  background: linear-gradient(180deg, rgba(226, 232, 240, 0.82), rgba(203, 213, 225, 0.9));
}

.grid-cell-wall::before {
  display: none;
}

.grid-cell-wall .grid-cell-policy {
  color: rgba(var(--ink), 0.45);
}

.legend-detail {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
}

.legend-start { background: rgba(37, 99, 235, 0.75); }
.legend-goal { background: rgba(16, 185, 129, 0.78); }
.legend-hazard { background: rgba(244, 63, 94, 0.82); }
.legend-wall { background: rgba(100, 116, 139, 0.72); }

.trajectory-summary {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 120px;
}

.trajectory-empty,
.trajectory-meta {
  padding: 16px;
  border-radius: 18px;
  background: #f8fafc;
  border: 1px solid rgba(17, 24, 39, 0.08);
  color: rgba(var(--ink), 0.66);
  font-size: 13px;
  line-height: 1.6;
}

@media (max-width: 1024px) {
  .metric-value {
    font-size: 24px;
  }

  .math-grid,
  .math-grid-wide {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .math-panel {
    padding: 22px;
  }

  .math-grid,
  .math-grid-wide {
    grid-template-columns: 1fr;
  }

  .bridge-panel {
    padding: 22px;
  }

  .chart-shell {
    height: 210px;
  }

  .chart-shell-compact {
    height: 190px;
  }

  .gridworld-board {
    gap: 10px;
  }

  .grid-cell {
    min-height: 82px;
    padding: 8px;
  }

  .grid-cell-policy {
    font-size: 22px;
  }
}