:root {
  --bg: #0a0c10;
  --surface: #0e1116;
  --surface-variant: #12161d;
  --surface-2: #171c24;
  --text: #e7e7e7;
  --muted: #9aa3b2;
  --outline: #1f2733;
  --accent: #00e060;
  --accent-variant: #00b34a;
  --success: #00e060;
  --warning: #ffd34d;
  --error: #ff4d4d;
  --player-color: var(--accent);
  --ai-color: #ff4d4d;
  --radius: 6px;
  --radius-sm: 4px;
  --radius-lg: 10px;
  --shadow: 0 0 0 2px #000 inset, 0 2px 0 #000, 0 0 0 1px var(--outline);
  --canvas-bg: #0a0c10;
  --ball-color: #fff;
  --net-color: #273041;
  --transition: all .12s steps(2, end);
  --focus-ring: 0 0 0 3px rgba(0, 224, 96, .35);
  --pixel: 2px
}

[data-theme=light] {
  --bg: #e3efc7;
  --surface: #d2e3a8;
  --surface-variant: #c3d492;
  --surface-2: #b1c47e;
  --text: #2e3b1c;
  --muted: #475a2a;
  --outline: #5e7640;
  --accent: #2c7a1b;
  --accent-variant: #1f5b12;
  --success: #2c7a1b;
  --warning: #846a00;
  --error: #8b1a1a;
  --canvas-bg: #cddf9b;
  --ball-color: #000;
  --net-color: #95aa63
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent
}

body,
html {
  height: 100%
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: VT323, ui-monospace, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  font-size: 18px;
  line-height: 1.45;
  padding: max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  position: relative
}

.shell {
  width: 100%;
  max-width: 900px;
  margin: 0 auto
}

.appbar,
.board.crt {
  position: relative;
  isolation: isolate
}

.board.crt::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, .04), rgba(255, 255, 255, .04) 1px, transparent 1px, transparent 3px);
  mix-blend-mode: overlay;
  opacity: .35
}

.board.crt::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 120px rgba(0, 0, 0, .6);
  border-radius: var(--radius)
}

.appbar {
  background: var(--surface);
  border: var(--pixel) solid var(--outline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px
}

.brandbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px
}

.brand {
  font-weight: 700;
  font-size: 40px;
  letter-spacing: 1px;
  text-shadow: 0 0 8px color-mix(in oklab, var(--accent), transparent 80%)
}

.score-display {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 26px;
  font-weight: 700;
  margin: 0 auto;
  padding: 2px 10px;
  border: var(--pixel) solid var(--outline);
  background: var(--surface-variant);
  border-radius: 4px;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, .6)
}

.score-separator {
  opacity: .75
}

.ft-label {
  margin-left: 8px;
  padding: 2px 8px;
  border-radius: 4px;
  border: var(--pixel) solid var(--outline);
  color: var(--text);
  font-size: 16px;
  letter-spacing: 1px;
  background: var(--surface-variant)
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px
}

.button-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap
}

.btn {
  position: relative;
  font-family: VT323, ui-monospace, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  border: var(--pixel) solid var(--outline);
  background: var(--surface-variant);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 4px;
  cursor: pointer;
  transition: transform .08s steps(2, end);
  font-size: 17px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  user-select: none;
  box-shadow: 0 2px 0 #000, inset 0 -2px 0 rgba(0, 0, 0, .6)
}

.btn:hover {
  transform: translateY(-1px)
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 0 0 #000, inset 0 0 0 rgba(0, 0, 0, .6)
}

.btn:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 3px rgba(0, 224, 96, .35)
}

.btn.primary {
  background: var(--accent);
  color: #001a0a;
  border-color: color-mix(in oklab, var(--accent), #000 35%)
}

.btn.ghost {
  background: 0 0
}

.btn.small {
  padding: 8px 10px;
  font-size: 16px
}

.btn.tiny {
  padding: 6px 8px;
  font-size: 15px
}

.btn.icon {
  width: 38px;
  height: 38px;
  border-radius: 4px;
  padding: 0
}

.btn.icon svg {
  display: block;
  width: 20px;
  height: 20px
}

.btn:disabled {
  opacity: .55;
  cursor: not-allowed;
  filter: grayscale(0.15);
}
.btn:disabled svg { opacity: .8; }

#startBtn .icon-running {
  display: none;
}

#startBtn .icon-start {
  display: inline-block;
}

#startBtn[data-icon="running"] .icon-start {
  display: none;
}

#startBtn[data-icon="running"] .icon-running {
  display: inline-block;
}

#pauseBtn .icon-resume {
  display: none;
}

#pauseBtn[data-icon="resume"] .icon-pause {
  display: none;
}

#pauseBtn[data-icon="resume"] .icon-resume {
  display: inline-block;
}

.icon-sun {
  display: none
}

[data-theme=light] .icon-sun {
  display: block
}

[data-theme=light] .icon-moon {
  display: none
}

.board {
  background: var(--surface);
  border: var(--pixel) solid var(--outline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px
}

.canvas-container {
  position: relative;
  margin-bottom: 12px
}

#pong {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  background: var(--canvas-bg);
  outline: var(--pixel) solid var(--outline);
  image-rendering: pixelated
}

.result-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, .76);
  border-radius: 4px;
  z-index: 10;
  pointer-events: none
}

.result-content {
  text-align: center
}

.result-badge {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 12px
}

.side {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px
}

.ai-label,
.player-label {
  font-size: 26px;
  color: #fff;
  font-weight: 700;
  opacity: .8;
  letter-spacing: 1px
}

.vs-separator {
  font-size: 26px;
  color: #fff;
  font-weight: 700;
  opacity: .7;
  margin-top: 18%;
}

.badge {
  padding: 12px 18px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 30px;
  letter-spacing: 2px;
  color: #001a0a;
  background: var(--success);
  border: var(--pixel) solid color-mix(in oklab, var(--success), #000 35%);
  text-transform: uppercase
}

.badge.lose {
  background: var(--error);
  color: #1a0000;
  border-color: color-mix(in oklab, var(--error), #000 35%)
}

.hidden {
  display: none !important
}

.hint {
  text-align: center;
  opacity: 0.8;
  margin-top: 12px;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px
}

.stats {
  margin-top: 14px;
  border-top: var(--pixel) solid var(--outline);
  padding-top: 12px;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  align-items: center
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px
}

.stat-label {
  font-size: 20px;
  opacity: .8;
  letter-spacing: 1px
}

.stat-value {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 1px
}

.adv-stats {
  margin-top: 18px;
  border-top: var(--pixel) solid var(--outline);
  padding-top: 14px
}

.adv-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px
}

.adv-head h3 {
  font-size: 20px;
  font-weight: 500;
  margin: 0;
  letter-spacing: 1px
}

.adv-head .adv-actions {
  margin-left: auto
}

.adv-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 12px
}

.adv-kpi {
  background: var(--surface-variant);
  border: var(--pixel) solid var(--outline);
  border-radius: 4px;
  padding: 12px;
  text-align: center;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, .6)
}

.kpi-label {
  display: block;
  opacity: .8;
  font-size: 20px;
  letter-spacing: 1px;
  margin-bottom: 6px
}

.kpi-value {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 1px
}

.heatmaps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px
}

.heatcard {
  background: var(--surface-variant);
  border: var(--pixel) solid var(--outline);
  border-radius: 4px;
  padding: 12px
}

.heat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  opacity: .85;
  font-size: 20px;
  letter-spacing: 1px
}

.heat {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  background: var(--surface);
  outline: var(--pixel) solid var(--outline)
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center
}

.backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, .7)
}

.modal-card {
  position: relative;
  z-index: 1;
  width: min(720px, 96vw);
  max-height: 90vh;
  overflow: hidden;
  border-radius: 6px;
  background: var(--surface);
  border: var(--pixel) solid var(--outline);
  box-shadow: 0 6px 0 #000, 0 0 0 1px var(--outline);
  display: flex;
  flex-direction: column
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: var(--pixel) solid var(--outline)
}

.modal-header h2 {
  font-size: 24px;
  font-weight: 500;
  margin: 0;
  letter-spacing: 1px
}

.modal-content {
  overflow-y: auto;
  padding: 0 18px
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 0 18px;
  border-bottom: var(--pixel) solid var(--outline);
  flex-wrap: wrap
}

.tab {
  padding: 10px 12px;
  border: none;
  border-bottom: var(--pixel) solid transparent;
  background: 0 0;
  color: var(--text);
  cursor: pointer;
  font-weight: 500;
  font-family: VT323, ui-monospace, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  font-size: 20px;
  letter-spacing: 1px
}

.tab.active {
  color: #001a0a;
  background: var(--accent);
  border-bottom-color: color-mix(in oklab, var(--accent), #000 30%)
}

.panel {
  display: none;
  padding: 18px 0
}

.panel.active {
  display: block
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px
}

.form-row>label {
  min-width: 160px
}

.form-row input[type=range],
.form-row select {
  flex: 1;
  min-width: 220px;
  background: var(--surface-variant);
  color: var(--text);
  border: var(--pixel) solid var(--outline);
  border-radius: 4px;
  padding: 8px 10px;
  outline: 0;
  font-family: inherit;
  font-size: 16px
}

.form-row input[type=range]:focus,
.form-row select:focus {
  box-shadow: 0 0 0 3px rgba(0, 224, 96, .35)
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1
}

.slider-value {
  min-width: 50px;
  text-align: right;
  font-size: 16px;
  opacity: .8
}

input[type=range] {
  appearance: none;
  -webkit-appearance: none;
  height: 6px;
  background: var(--surface-variant)
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border: var(--pixel) solid color-mix(in oklab, var(--accent), #000 35%)
}

input[type=range]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent);
  border: var(--pixel) solid color-mix(in oklab, var(--accent), #000 35%)
}

.radio-col,
.radio-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap
}

.radio-col {
  flex-direction: column;
  align-items: flex-start
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer
}

.radio-option span {
  font-size: 16px
}

.switch {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer
}

.switch input {
  position: relative;
  width: 44px;
  height: 24px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--surface-variant);
  border: var(--pixel) solid var(--outline);
  border-radius: 4px;
  cursor: pointer
}

.switch input:checked {
  background: var(--accent);
  border-color: color-mix(in oklab, var(--accent), #000 35%)
}

.switch input::before {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  background: #001a0a;
  top: 3px;
  left: 3px;
  transition: transform .12s steps(2, end)
}

.switch input:checked::before {
  transform: translateX(21px)
}

.switch-label {
  font-size: 16px
}

.keyboard-hints {
  margin-top: 12px;
  padding-top: 12px;
  border-top: var(--pixel) solid var(--outline)
}

.keyboard-hints h4 {
  font-size: 16px;
  margin-bottom: 8px;
  letter-spacing: 1px
}

.keyboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px
}

.key-hint {
  display: flex;
  align-items: center;
  gap: 8px
}

kbd {
  background: var(--surface-variant);
  border: var(--pixel) solid var(--outline);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 16px
}

.modal-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-top: var(--pixel) solid var(--outline);
  margin-top: auto
}

.modal-footer .spacer {
  flex: 1
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 4px;
  border: var(--pixel) solid var(--outline);
  box-shadow: 0 2px 0 #000;
  font-size: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s steps(2, end), transform .15s steps(2, end);
  z-index: 60;
  max-width: 90vw;
  text-align: center
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0)
}

@media (max-width:900px) {
  .brandbar {
    flex-wrap: wrap;
    justify-content: center
  }

  .score-display {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: 8px
  }

  .button-group {
    justify-content: center
  }
}

@media (max-width:768px) {
  body {
    padding: 12px
  }

  .appbar {
    padding: 14px;
    gap: 14px
  }

  .stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px
  }

  .stats .btn.tiny {
    grid-column: 3/4
  }

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

  .heatmaps {
    grid-template-columns: 1fr
  }

  .modal-card {
    width: 95vw;
    max-height: 95vh
  }

  .modal-content {
    padding: 0 12px
  }

  .tabs {
    padding: 0 12px
  }

  .form-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px
  }

  .form-row>label {
    min-width: auto
  }

  .form-row input[type=range],
  .form-row select {
    min-width: auto;
    width: 100%
  }

  .slider-container {
    width: 100%
  }

  .radio-row {
    flex-direction: column;
    gap: 6px
  }
}

@media (max-width:480px) {
  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr))
  }

  .stats .btn.tiny {
    grid-column: 2/3
  }

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

  .button-group {
    flex-direction: column;
    width: 100%
  }

  .button-group .btn {
    width: 100%
  }

  .result-badge {
    flex-direction: column;
    gap: 12px
  }

  .keyboard-grid {
    grid-template-columns: 1fr
  }

  .modal-footer {
    flex-wrap: wrap
  }

  .modal-footer .spacer {
    display: none
  }

  .modal-footer .btn {
    flex: 1;
    min-width: 0
  }
}

@media (prefers-reduced-motion:reduce) {
  * {
    transition: none !important;
    animation: none !important
  }
}