:root {
  /* Cool palette */
  --bg-deep: #0a0e1a;
  --bg-mid: #131a2e;
  --bg-glow-a: #1c2a52;
  --bg-glow-b: #0d2333;
  --accent: #5ad7ff;
  --accent-soft: #9cf;
  --accent-dim: rgba(90, 215, 255, 0.35);
  --panel-bg: rgba(16, 22, 38, 0.62);
  --panel-border: rgba(120, 180, 255, 0.18);
  --text: #e6edf6;
  --text-dim: #8ea0bf;
  --ok: #5ef2a0;
  --no: #ff7a8a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-deep);
  overflow: hidden;
}

.threejs-canvas
{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  outline: none;
  display: block;
  z-index: 1;
}

.pixi-canvas
{
  position: absolute;
  top: 0;
  left: 0;
  outline: none;
}

#app {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 480px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--text);
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(120% 90% at 18% 12%, var(--bg-glow-a) 0%, transparent 55%),
    radial-gradient(120% 110% at 85% 88%, var(--bg-glow-b) 0%, transparent 55%),
    linear-gradient(150deg, var(--bg-mid) 0%, var(--bg-deep) 70%);
}

/* Slow drifting aurora layer, behind the canvas */
#app::before {
  content: "";
  position: absolute;
  inset: -20%;
  z-index: 0;
  background:
    radial-gradient(40% 50% at 30% 30%, rgba(90, 215, 255, 0.10) 0%, transparent 60%),
    radial-gradient(45% 55% at 72% 68%, rgba(140, 110, 255, 0.10) 0%, transparent 60%);
  filter: blur(8px);
  animation: aurora-drift 26s ease-in-out infinite alternate;
}

/* Vignette above the canvas to seat the cube in the scene */
#app::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(120% 100% at 50% 50%, transparent 60%, rgba(0, 0, 0, 0.55) 100%);
}

@keyframes aurora-drift {
  0%   { transform: translate3d(-3%, -2%, 0) scale(1.02); }
  50%  { transform: translate3d(2%, 3%, 0) scale(1.08); }
  100% { transform: translate3d(4%, -3%, 0) scale(1.04); }
}

@media (prefers-reduced-motion: reduce) {
  #app::before { animation: none; }
}

/* ---- Glass panel shared look ---- */
#app #debugger,
#app #help,
#app #dbg-toggle,
#app #lessons,
#app #lsn-toggle,
#app #practice,
#app #prc-toggle {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.45),
    0 1px 0 rgba(255, 255, 255, 0.06) inset;
}

#app #debugger {
  position: absolute;
  top: 16px;
  right: 16px;
  color: var(--text);
  padding: 14px 16px 16px;
  border-radius: 14px;
  font-size: 12px;
  line-height: 1.4;
  min-width: 232px;
  max-width: 290px;
  user-select: none;
  z-index: 10;
  transform-origin: top right;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

#app #debugger.is-hidden {
  opacity: 0;
  transform: scale(0.94) translateY(-6px);
  pointer-events: none;
}

#debugger .dbg-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 0 0 10px 0;
}

#debugger h3 {
  margin: 0;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent-dim);
}

#debugger .dbg-close {
  appearance: none;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  width: 22px;
  height: 22px;
  border-radius: 7px;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
#debugger .dbg-close:hover {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: rgba(90, 215, 255, 0.10);
}

#debugger .row { display: flex; justify-content: space-between; gap: 8px; color: var(--text-dim); }
#debugger .solved-yes { color: var(--ok); text-shadow: 0 0 10px rgba(94, 242, 160, 0.4); }
#debugger .solved-no  { color: var(--no); }

#debugger .faces {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 8px;
  margin: 10px 0;
}
#debugger .face {
  display: grid;
  grid-template-columns: repeat(3, 11px);
  grid-template-rows: repeat(3, 11px);
  gap: 1.5px;
  padding: 3px;
  background: rgba(0, 0, 0, 0.32);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 5px;
}
#debugger .face .label {
  grid-column: 1 / span 3;
  text-align: center;
  font-size: 9px;
  letter-spacing: .1em;
  color: var(--text-dim);
  margin-bottom: 2px;
}
#debugger .sticker {
  width: 11px;
  height: 11px;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.25);
}

#debugger .hist-title {
  margin-top: 8px;
  color: var(--text-dim);
  font-size: 11px;
  letter-spacing: .06em;
}

#debugger .history {
  margin-top: 4px;
  max-height: 80px;
  overflow-y: auto;
  font-size: 11px;
  color: var(--text);
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.04);
  padding: 6px 8px;
  border-radius: 7px;
  white-space: normal;
  word-break: break-word;
}
#debugger .history::-webkit-scrollbar { width: 6px; }
#debugger .history::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 6px; }

/* Floating reopen toggle, shown when the debugger is closed */
#app #dbg-toggle {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 11;
  appearance: none;
  cursor: pointer;
  display: none;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border-radius: 11px;
  font-family: inherit;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
#app #dbg-toggle.is-visible { display: inline-flex; }
#app #dbg-toggle:hover {
  border-color: var(--accent-dim);
  background: rgba(90, 215, 255, 0.10);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4), 0 0 18px var(--accent-dim);
}
#app #dbg-toggle .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

#app #help {
  position: absolute;
  bottom: 16px;
  left: 16px;
  color: var(--text-dim);
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 11px;
  line-height: 1.6;
  z-index: 10;
  max-width: min(70vw, 560px);
}
#help b { color: var(--accent-soft); font-weight: 600; }

/* ---- Lessons panel ---- */
#app #lessons {
  position: absolute;
  top: 16px;
  left: 16px;
  color: var(--text);
  padding: 14px 16px 16px;
  border-radius: 14px;
  font-size: 12px;
  line-height: 1.45;
  width: 290px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  z-index: 10;
  transform-origin: top left;
  transition: opacity 0.22s ease, transform 0.22s ease;
}
#app #lessons.is-hidden {
  opacity: 0;
  transform: scale(0.94) translateY(-6px);
  pointer-events: none;
}
#lessons::-webkit-scrollbar { width: 6px; }
#lessons::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 6px; }

#lessons .lsn-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
#lessons h3 {
  margin: 0;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--accent-soft);
}
#lessons .lsn-close {
  appearance: none;
  cursor: pointer;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  padding: 0 4px;
}
#lessons .lsn-close:hover { color: var(--text); }

#lessons .lsn-filter {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}
#lessons .lsn-track,
#lessons .lsn-item,
#lessons .lsn-btn {
  appearance: none;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
#lessons .lsn-track { flex: 1; }
#lessons .lsn-track.is-active,
#lessons .lsn-item.is-active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(90, 215, 255, 0.10);
}
#lessons .lsn-track:hover,
#lessons .lsn-item:hover,
#lessons .lsn-btn:hover:not(:disabled) {
  border-color: var(--accent-dim);
}

#lessons .lsn-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
#lessons .lsn-item { text-align: left; }

#lessons .lsn-detail {
  border-top: 1px solid var(--panel-border);
  padding-top: 10px;
}
#lessons .lsn-hint { color: var(--text-dim); margin: 4px 0; }
#lessons .lsn-title { margin: 0 0 4px; font-size: 13px; }
#lessons .lsn-audience { margin: 0 0 6px; color: var(--text-dim); font-size: 11px; font-style: italic; }
#lessons .lsn-desc { margin: 0 0 8px; color: var(--text-dim); }
#lessons .lsn-counter {
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin-bottom: 4px;
}
#lessons .lsn-step-title { margin: 0 0 4px; font-size: 12px; }
#lessons .lsn-step-body { margin: 0 0 8px; }
#lessons .lsn-moves {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 7px;
  padding: 6px 8px;
  margin-bottom: 8px;
}
#lessons .lsn-status {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 10px;
}
#lessons .lsn-status.done {
  color: var(--ok);
  text-shadow: 0 0 10px rgba(94, 242, 160, 0.4);
}
#lessons .lsn-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}
#lessons .lsn-btn:disabled { opacity: 0.4; cursor: default; }

#lessons .lsn-coaching {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}
#lessons .lsn-coaching-item {
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 7px 8px;
  background: rgba(255, 255, 255, 0.04);
}
#lessons .lsn-coaching-item strong {
  display: block;
  margin-bottom: 3px;
  font-size: 11px;
  color: var(--accent-soft);
}
#lessons .lsn-coaching-item p {
  margin: 0;
  color: var(--text-dim);
}
#lessons .lsn-coaching-item.mistake {
  border-color: rgba(255, 122, 138, 0.45);
}
#lessons .lsn-coaching-item.mistake strong {
  color: var(--no);
}
#lessons .lsn-coaching-item.recommendation strong {
  color: var(--ok);
}

/* Floating reopen toggle, shown when the lessons panel is closed */
#app #lsn-toggle {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 11;
  appearance: none;
  cursor: pointer;
  display: none;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border-radius: 11px;
  font-family: inherit;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
#app #lsn-toggle.is-visible { display: inline-flex; }
#app #lsn-toggle:hover {
  border-color: var(--accent-dim);
  background: rgba(90, 215, 255, 0.10);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4), 0 0 18px var(--accent-dim);
}
#app #lsn-toggle .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

/* ---- Practice panel ---- */
#app #practice {
  position: absolute;
  bottom: 16px;
  right: 16px;
  color: var(--text);
  padding: 14px 16px 16px;
  border-radius: 14px;
  font-size: 12px;
  line-height: 1.45;
  width: 290px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  z-index: 10;
  transform-origin: bottom right;
  transition: opacity 0.22s ease, transform 0.22s ease;
}
#app #practice.is-hidden {
  opacity: 0;
  transform: scale(0.94) translateY(6px);
  pointer-events: none;
}
#practice::-webkit-scrollbar { width: 6px; }
#practice::-webkit-scrollbar-thumb { background: var(--accent-dim); border-radius: 6px; }

#practice .prc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
#practice h3 {
  margin: 0;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--accent-soft);
}
#practice .prc-close {
  appearance: none;
  cursor: pointer;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  padding: 0 4px;
}
#practice .prc-close:hover { color: var(--text); }

#practice .prc-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}
#practice .prc-cat,
#practice .prc-item,
#practice .prc-btn {
  appearance: none;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
#practice .prc-cat { flex: 1; }
#practice .prc-cat.is-active,
#practice .prc-item.is-active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(90, 215, 255, 0.10);
}
#practice .prc-cat:hover,
#practice .prc-item:hover,
#practice .prc-btn:hover:not(:disabled) {
  border-color: var(--accent-dim);
}

#practice .prc-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
#practice .prc-item { text-align: left; }

#practice .prc-detail {
  border-top: 1px solid var(--panel-border);
  padding-top: 10px;
}
#practice .prc-hint { color: var(--text-dim); margin: 4px 0; }
#practice .prc-title { margin: 0 0 4px; font-size: 13px; }
#practice .prc-meta {
  margin: 0 0 6px;
  color: var(--text-dim);
  font-size: 11px;
  text-transform: capitalize;
}
#practice .prc-prompt { margin: 0 0 8px; color: var(--text-dim); }
#practice .prc-counter {
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin-bottom: 8px;
}
#practice .prc-feedback {
  font-size: 12px;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 7px 8px;
  margin-bottom: 10px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
}
#practice .prc-feedback.correct {
  border-color: rgba(94, 242, 160, 0.45);
  color: var(--ok);
}
#practice .prc-feedback.wrong {
  border-color: rgba(255, 122, 138, 0.45);
  color: var(--no);
}
#practice .prc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
#practice .prc-btn:disabled { opacity: 0.4; cursor: default; }

/* Floating reopen toggle, shown when the practice panel is closed */
#app #prc-toggle {
  position: absolute;
  bottom: 16px;
  right: 16px;
  z-index: 11;
  appearance: none;
  cursor: pointer;
  display: none;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border-radius: 11px;
  font-family: inherit;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
#app #prc-toggle.is-visible { display: inline-flex; }
#app #prc-toggle:hover {
  border-color: var(--accent-dim);
  background: rgba(90, 215, 255, 0.10);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.4), 0 0 18px var(--accent-dim);
}
#app #prc-toggle .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}