:root {
  color-scheme: dark;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  --panel: rgba(12, 27, 37, 0.94);
  --panel-soft: rgba(28, 49, 61, 0.84);
  --border: rgba(174, 215, 229, 0.18);
  --text: #ecf8fb;
  --muted: #9fc0ca;
  --accent: #49d8a3;
  --warning: #ffd166;
  --danger: #ff6b6b;
}

* {
  box-sizing: border-box;
}

html,
body,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  background: #10202b;
  color: var(--text);
}

button,
input {
  font: inherit;
}

button {
  min-height: 2.35rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  padding: 0.5rem 0.75rem;
  background: #1e3a49;
  color: var(--text);
  cursor: pointer;
  touch-action: manipulation;
}

button:hover {
  background: #285064;
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

#scene {
  display: block;
  width: 100%;
  height: 100%;
}

#loading {
  position: fixed;
  inset: 50% auto auto 50%;
  z-index: 20;
  display: grid;
  gap: 0.35rem;
  min-width: 15rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--panel);
  box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.35);
  text-align: center;
  transform: translate(-50%, -50%);
}

#loading[hidden] {
  display: none;
}
#loading-text {
  color: var(--muted);
}

#toolbar {
  position: fixed;
  inset-block-start: max(0.75rem, env(safe-area-inset-top));
  inset-inline-start: max(0.75rem, env(safe-area-inset-left));
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  max-width: calc(100vw - 25rem);
  padding: 0.45rem;
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  background: var(--panel);
  backdrop-filter: blur(12px);
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding-inline: 0.5rem;
  color: var(--muted);
}

.speed-control input {
  width: 6rem;
  accent-color: var(--accent);
}
.speed-control output {
  min-width: 2rem;
  color: var(--text);
}

#stats {
  position: fixed;
  inset-block-start: 5rem;
  inset-inline-start: 0.75rem;
  z-index: 10;
  padding: 0.45rem 0.65rem;
  border-radius: 0.45rem;
  background: rgba(0, 0, 0, 0.72);
  font:
    0.78rem ui-monospace,
    SFMono-Regular,
    Consolas,
    monospace;
}

.hidden {
  display: none !important;
}

#expert-panel {
  position: fixed;
  inset-block: 0;
  inset-inline-end: 0;
  z-index: 9;
  width: min(24rem, 34vw);
  border-inline-start: 1px solid var(--border);
  background: var(--panel);
  box-shadow: -0.7rem 0 2rem rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(16px);
  transition: transform 180ms ease;
}

#expert-panel.collapsed {
  transform: translateX(calc(100% - 3.4rem));
}
[dir="rtl"] #expert-panel.collapsed {
  transform: translateX(calc(-100% + 3.4rem));
}

.panel-header,
.section-heading,
.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.panel-header {
  min-height: 5.5rem;
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}
.panel-header h1 {
  margin: 0.15rem 0 0;
  font-size: 1.2rem;
}
.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.icon-button {
  min-width: 2.5rem;
  padding: 0.35rem;
  font-size: 1.25rem;
}

#panel-body {
  height: calc(100% - 5.5rem);
  overflow: auto;
  overscroll-behavior: contain;
  padding: 0.9rem;
}

.status-row {
  flex-wrap: wrap;
  padding: 0.75rem;
  border-radius: 0.7rem;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 0.82rem;
}

.status-row strong {
  color: var(--text);
}
.panel-section {
  margin-block-start: 1rem;
}
.panel-section h2,
dialog h2 {
  margin: 0 0 0.55rem;
  font-size: 0.92rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}
td {
  padding: 0.38rem 0.45rem;
  border-bottom: 1px solid var(--border);
}
td:first-child {
  color: var(--muted);
}
td:last-child {
  text-align: end;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}

.rules-list,
.decision-log {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.rules-list li,
.decision-log li {
  padding: 0.58rem;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  background: rgba(255, 255, 255, 0.025);
  font-size: 0.78rem;
}
.rules-list li.fired {
  border-color: var(--accent);
  background: rgba(73, 216, 163, 0.12);
}
.rule-id {
  color: var(--accent);
  font-weight: 800;
}
.decision-log {
  max-height: 13rem;
  overflow: auto;
}

dialog {
  width: min(34rem, calc(100vw - 2rem));
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 0;
  background: #132b38;
  color: var(--text);
  box-shadow: 0 1.5rem 5rem rgba(0, 0, 0, 0.5);
}

dialog::backdrop {
  background: rgba(3, 11, 16, 0.68);
  backdrop-filter: blur(3px);
}
dialog form {
  padding: 1rem;
}
#why-content {
  line-height: 1.55;
  color: var(--muted);
}

@media (max-width: 760px) {
  #toolbar {
    inset-inline-end: 0.5rem;
    max-width: none;
    gap: 0.3rem;
    padding: 0.35rem;
  }

  #toolbar button {
    min-height: 2rem;
    padding: 0.38rem 0.55rem;
    font-size: 0.78rem;
  }
  .speed-control {
    order: 3;
    width: 100%;
    font-size: 0.75rem;
  }
  .speed-control input {
    flex: 1;
  }
  #stats {
    inset-block-start: 7.2rem;
  }

  #expert-panel {
    inset-block: auto 0;
    inset-inline: 0;
    width: 100%;
    height: min(48vh, 26rem);
    border-block-start: 1px solid var(--border);
    border-inline-start: 0;
    border-radius: 1rem 1rem 0 0;
    transition: transform 180ms ease;
  }

  #expert-panel.collapsed,
  [dir="rtl"] #expert-panel.collapsed {
    transform: translateY(calc(100% - 4rem));
  }
  .panel-header {
    min-height: 4rem;
    padding: 0.65rem 0.85rem;
  }
  .panel-header h1 {
    font-size: 1rem;
  }
  #panel-body {
    height: calc(100% - 4rem);
    padding: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}