:root {
  --bg-0: #010106;
  --bg-1: #09071e;
  --ui-bg: rgba(8, 6, 21, 0.92);
  --ui-border: rgba(118, 247, 255, 0.7);
  --ui-glow: rgba(255, 82, 170, 0.62);
  --line: rgba(118, 247, 255, 0.34);
  --text: #f5f8ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 18% 14%, rgba(255, 62, 150, 0.34), transparent 40%),
    radial-gradient(circle at 84% 18%, rgba(74, 236, 255, 0.32), transparent 44%),
    radial-gradient(circle at 50% 30%, var(--bg-1), var(--bg-0) 74%);
  color: var(--text);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  overflow: hidden;
}

#game {
  width: 100vw;
  height: 100vh;
  display: block;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

#game::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(70% 52% at 50% 84%, rgba(77, 238, 255, 0.14), transparent 68%),
    radial-gradient(52% 34% at 50% 14%, rgba(255, 89, 170, 0.16), transparent 78%),
    linear-gradient(180deg, rgba(0, 0, 0, 0.34), rgba(0, 0, 0, 0) 22%, rgba(0, 0, 0, 0.3));
}

#game::after {
  content: "";
  position: absolute;
  inset: 10px 10px calc(100px + env(safe-area-inset-bottom)) 10px;
  z-index: 3;
  pointer-events: none;
  border-radius: 14px;
  border: 1px solid rgba(109, 242, 255, 0.26);
  box-shadow:
    inset 0 0 28px rgba(84, 240, 255, 0.09),
    inset 0 0 58px rgba(255, 94, 171, 0.08),
    0 0 24px rgba(86, 231, 255, 0.14);
}

#game canvas {
  image-rendering: auto;
  filter: saturate(1.42) contrast(1.23) brightness(0.85) drop-shadow(0 0 24px rgba(78, 228, 255, 0.2));
}

.game-controls {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 55;
  padding: 10px 0 calc(12px + env(safe-area-inset-bottom));
  background:
    linear-gradient(180deg, rgba(10, 8, 27, 0.96), rgba(5, 4, 14, 0.96));
  border-top: 1px solid var(--line);
  box-shadow: 0 -8px 26px rgba(255, 76, 159, 0.18), 0 -2px 12px rgba(103, 246, 255, 0.18);
  backdrop-filter: blur(9px);
}

.game-controls-wrap {
  width: min(100% - 18px, 760px);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 8px;
}

.section-header h2 {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #87f6ff;
  text-shadow: 0 0 9px rgba(103, 246, 255, 0.45);
}

.section-header p {
  margin: 4px 0 0;
  font-size: 0.73rem;
  color: #ffc0e6;
}

.btn {
  appearance: none;
  border: 1px solid var(--ui-border);
  background: linear-gradient(180deg, rgba(26, 20, 52, 0.97), rgba(15, 12, 35, 0.97));
  color: var(--text);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: none;
  box-shadow:
    inset 0 1px 0 rgba(211, 245, 255, 0.18),
    0 0 0 1px rgba(97, 228, 255, 0.32),
    0 0 15px rgba(255, 96, 184, 0.35);
  user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

.btn.primary {
  background: linear-gradient(180deg, rgba(22, 117, 148, 0.98), rgba(19, 49, 86, 0.98));
}

.btn.ghost {
  background: linear-gradient(180deg, rgba(42, 22, 59, 0.97), rgba(16, 13, 35, 0.97));
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow:
    inset 0 1px 0 rgba(197, 236, 255, 0.28),
    0 0 0 1px rgba(106, 236, 255, 0.66),
    0 0 22px rgba(255, 78, 163, 0.7);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
  box-shadow:
    inset 0 2px 0 rgba(6, 12, 22, 0.88),
    0 0 0 1px rgba(82, 197, 255, 0.58),
    0 0 16px rgba(255, 78, 163, 0.58);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.gamepad {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  align-items: center;
}

.gamepad-dpad {
  display: grid;
  gap: 6px;
}

.gamepad-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.gamepad-row.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.gamepad-actions {
  display: grid;
  gap: 8px;
}

.game-control-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.gamepad .btn {
  min-width: 0;
}

.racer-leaderboard {
  margin-top: 10px;
  border: 1px solid rgba(118, 247, 255, 0.34);
  border-radius: 12px;
  background: rgba(7, 8, 20, 0.84);
  padding: 10px;
  box-shadow: inset 0 0 20px rgba(82, 230, 255, 0.08);
}

.racer-leaderboard-head h3 {
  margin: 0;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #8bf5ff;
}

.racer-leaderboard-head p {
  margin: 4px 0 0;
  font-size: 0.72rem;
  color: #ffb8e2;
}

.challenger-onboarding {
  margin-top: 8px;
  border: 1px solid rgba(117, 243, 255, 0.36);
  border-radius: 10px;
  padding: 8px 9px;
  background:
    linear-gradient(115deg, rgba(45, 36, 88, 0.45), rgba(15, 30, 58, 0.42)),
    rgba(6, 9, 24, 0.76);
}

.challenger-onboarding[hidden] {
  display: none;
}

.challenger-onboarding-title {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #96f8ff;
  font-weight: 700;
}

.challenger-onboarding-list {
  margin: 6px 0 0;
  padding-left: 16px;
  display: grid;
  gap: 3px;
  font-size: 0.71rem;
  color: #d6e9ff;
}

.challenger-onboarding-actions {
  margin-top: 7px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.racer-submit-row {
  margin-top: 8px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.racer-submit-row.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.racer-name-input {
  width: 100%;
  min-height: 40px;
  border: 1px solid rgba(118, 247, 255, 0.56);
  border-radius: 10px;
  padding: 0 11px;
  background: rgba(5, 7, 17, 0.9);
  color: var(--text);
  font-size: 0.82rem;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

.racer-name-input::placeholder {
  color: rgba(213, 229, 255, 0.56);
}

.racer-status,
.racer-rank {
  margin: 8px 0 0;
  font-size: 0.72rem;
  color: #cce9ff;
}

.racer-status[data-state="error"] {
  color: #ffb6c8;
}

.racer-rank {
  color: #8bf5ff;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.racer-board-list {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  max-height: 168px;
  overflow: auto;
}

.racer-board-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid rgba(118, 247, 255, 0.24);
  background: rgba(4, 6, 15, 0.82);
}

.racer-board-item.racer-board-owner {
  border-color: rgba(111, 244, 255, 0.58);
  background:
    linear-gradient(120deg, rgba(67, 238, 255, 0.2), rgba(255, 84, 167, 0.16)),
    rgba(4, 8, 21, 0.9);
  box-shadow:
    inset 0 0 0 1px rgba(105, 236, 255, 0.28),
    0 0 16px rgba(72, 236, 255, 0.2);
}

.racer-board-item.racer-board-owner-top {
  border-color: rgba(111, 244, 255, 0.9);
  box-shadow:
    inset 0 0 0 1px rgba(111, 244, 255, 0.32),
    0 0 24px rgba(83, 237, 255, 0.24),
    0 0 22px rgba(255, 87, 170, 0.2);
}

.racer-board-item strong {
  font-size: 0.72rem;
  color: #9df8ff;
}

.racer-board-item span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.racer-crown {
  font-size: 0.88rem;
  line-height: 1;
  filter:
    drop-shadow(0 0 5px rgba(76, 236, 255, 0.88))
    drop-shadow(0 0 8px rgba(255, 84, 168, 0.78));
}

.racer-board-item em {
  font-style: normal;
  font-size: 0.78rem;
  color: #ffbce5;
}

.racer-board-empty {
  font-size: 0.75rem;
  color: #d0dbef;
  padding: 8px 0;
}

@media (max-width: 820px) {
  body {
    overflow: auto;
  }

  #game {
    height: min(70dvh, 520px);
    min-height: 340px;
  }

  #game::after {
    inset: 8px;
  }

  .game-controls {
    position: static;
    padding: 7px 8px calc(10px + env(safe-area-inset-bottom));
    background: linear-gradient(180deg, rgba(10, 10, 18, 0.94), rgba(5, 5, 12, 0.96));
    border-top: 1px solid rgba(124, 240, 255, 0.26);
    box-shadow: 0 -12px 32px rgba(6, 10, 28, 0.66), 0 -3px 16px rgba(86, 235, 255, 0.14);
    backdrop-filter: blur(16px) saturate(135%);
    -webkit-backdrop-filter: blur(16px) saturate(135%);
  }

  .game-controls-wrap {
    width: min(100% - 4px, 760px);
  }

  .section-header {
    display: none;
  }

  .gamepad {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .gamepad-actions {
    gap: 8px;
  }

  .game-control-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  #startBtn {
    grid-column: 1 / -1;
  }

  .btn {
    min-height: 44px;
    border-radius: 14px;
    font-size: clamp(0.8rem, 3.2vw, 0.9rem);
    letter-spacing: 0.01em;
    text-transform: none;
    font-weight: 700;
    padding: 0 11px;
    white-space: nowrap;
    line-height: 1;
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.28),
      inset 0 -1px 0 rgba(12, 20, 38, 0.7),
      0 6px 16px rgba(0, 0, 0, 0.34),
      0 0 0 1px rgba(118, 247, 255, 0.18);
  }

  .btn.primary {
    background: linear-gradient(180deg, rgba(73, 188, 228, 0.98), rgba(29, 92, 148, 0.98));
    border-color: rgba(137, 236, 255, 0.8);
  }

  .btn.ghost {
    background: linear-gradient(180deg, rgba(34, 40, 62, 0.95), rgba(19, 22, 36, 0.95));
    border-color: rgba(186, 205, 248, 0.5);
  }

  .racer-leaderboard {
    margin-top: 8px;
    padding: 8px;
  }

  .racer-leaderboard-head h3 {
    font-size: 0.76rem;
  }

  .racer-leaderboard-head p {
    font-size: 0.68rem;
  }

  .racer-name-input {
    min-height: 38px;
    font-size: 0.78rem;
  }

  .racer-submit-row {
    gap: 6px;
  }

  .racer-board-list {
    max-height: 132px;
  }
}

@media (max-width: 1024px) {
  .game-controls {
    padding: 10px 8px calc(14px + env(safe-area-inset-bottom));
  }

  .game-controls-wrap {
    width: min(100% - 8px, 760px);
  }

  .section-header {
    margin-bottom: 8px;
  }

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

  .gamepad-actions {
    gap: 10px;
  }

  .game-control-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  #startBtn {
    grid-column: 1 / -1;
  }
}

@media (max-height: 760px) {
  body {
    overflow: auto;
  }

  #game {
    height: min(62vh, 430px);
    min-height: 300px;
  }

  #game::after {
    inset: 8px;
  }

  .game-controls {
    position: static;
    padding: 8px 6px calc(8px + env(safe-area-inset-bottom));
  }

  .game-controls-wrap {
    width: min(100% - 4px, 760px);
  }
}

@media (max-width: 420px) {
  #game {
    height: min(68dvh, 500px);
    min-height: 320px;
  }

  .racer-submit-row {
    grid-template-columns: 1fr;
  }

  .racer-submit-row.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-control-row {
    grid-template-columns: 1fr;
  }

  #startBtn {
    grid-column: auto;
  }
}

@media (min-width: 920px) {
  .section-header {
    display: none;
  }

  .game-controls {
    padding: 8px 0 10px;
  }

  .game-controls-wrap {
    width: min(100% - 18px, 680px);
  }

  .gamepad {
    grid-template-columns: 2fr 1fr;
  }
}