:root {
  color-scheme: light;
  --ink: #121511;
  --muted: #65705f;
  --paper: #efede5;
  --field: #91d63f;
  --field-dark: #0f8d2c;
  --field-deep: #056b34;
  --panel: #fffdf5;
  --line: #c8c1ae;
  --a: #f10b74;
  --b: #1edcff;
  --warn: #f7ea00;
  --shadow: 0 24px 70px rgba(20, 23, 18, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Noto Sans TC", "PingFang TC", Helvetica, sans-serif;
  letter-spacing: 0;
  color: var(--ink);
  background:
    linear-gradient(145deg, rgba(5, 107, 52, 0.12), transparent 42%),
    linear-gradient(315deg, rgba(247, 234, 0, 0.16), transparent 38%),
    var(--paper);
}

button,
a {
  font: inherit;
}

.pk-shell {
  width: min(1420px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 18px;
  min-height: 34px;
  color: var(--muted);
  font-size: 14px;
}

.topbar a,
.asset-row a {
  color: var(--field-deep);
  font-weight: 800;
  text-decoration: none;
}

.topbar span {
  margin-left: auto;
  font-weight: 800;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: end;
  padding: 24px 0 18px;
}

.kicker {
  margin: 0 0 8px;
  color: var(--a);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 880px;
  font-size: clamp(42px, 7vw, 92px);
  line-height: 0.95;
  letter-spacing: 0;
}

.round-console {
  display: grid;
  grid-template-columns: auto auto auto minmax(104px, auto) minmax(116px, auto);
  gap: 8px;
  align-items: stretch;
}

.round-console button,
.timer,
.winner {
  min-height: 54px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 245, 0.92);
  box-shadow: 0 8px 18px rgba(20, 23, 18, 0.08);
}

.round-console button {
  padding: 0 18px;
  color: var(--panel);
  background: var(--ink);
  border-color: var(--ink);
  font-weight: 900;
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease;
}

.round-console button:hover {
  transform: translateY(-1px);
  background: #283024;
}

.timer {
  display: grid;
  align-content: center;
  padding: 7px 14px;
}

.timer span {
  color: var(--a);
  font-size: 11px;
  font-weight: 900;
}

.timer strong {
  color: var(--a);
  font-size: 26px;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.winner {
  display: grid;
  place-items: center;
  padding: 0 16px;
  color: var(--field-deep);
  font-size: 18px;
  font-weight: 1000;
}

.arena-wrap {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 220px;
  gap: 18px;
  align-items: stretch;
}

.arena {
  position: relative;
  min-height: min(66vh, 640px);
  overflow: hidden;
  border: 1px solid #61705d;
  border-radius: 8px;
  background:
    linear-gradient(168deg, rgba(255, 253, 245, 0.42) 0 18%, transparent 18.2%),
    linear-gradient(160deg, rgba(255, 234, 0, 0.24) 0 31%, transparent 31.2%),
    linear-gradient(17deg, rgba(5, 107, 52, 0.76) 0 39%, transparent 39.2%),
    linear-gradient(180deg, var(--field) 0%, var(--field-dark) 100%);
  box-shadow: var(--shadow);
  touch-action: none;
  user-select: none;
}

.arena.winner-a {
  box-shadow:
    0 0 0 1px rgba(241, 11, 116, 0.32),
    0 0 46px rgba(241, 11, 116, 0.46),
    var(--shadow);
}

.arena.winner-b {
  box-shadow:
    0 0 0 1px rgba(30, 220, 255, 0.32),
    0 0 46px rgba(30, 220, 255, 0.46),
    var(--shadow);
}

.arena.winner-a::before,
.arena.winner-b::after {
  opacity: 1;
  filter: saturate(1.45) brightness(1.18);
}

.arena.winner-a::after {
  filter: grayscale(1) brightness(0.5);
  opacity: 0.4;
}

.arena.winner-b::before {
  filter: grayscale(1) brightness(0.56);
  opacity: 0.4;
}

#cameraVideo {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scaleX(-1);
  transition: opacity 220ms ease;
}

.arena.has-camera #cameraVideo {
  opacity: 0.34;
}

.arena.winner-a #cameraVideo,
.arena.winner-b #cameraVideo {
  opacity: 0.26;
}

.tree-layer {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.82;
  pointer-events: none;
}

.arena::before,
.arena::after {
  content: "";
  position: absolute;
  bottom: -7%;
  width: 58%;
  height: 42%;
  background: rgba(5, 92, 34, 0.35);
  transform: skewY(-12deg);
  transition: filter 260ms ease, opacity 260ms ease;
}

.arena::before {
  left: -14%;
}

.arena::after {
  right: -12%;
  background: rgba(150, 226, 59, 0.34);
}

.center-mark {
  position: absolute;
  inset: 9% 50% 9% auto;
  width: 1px;
  background: linear-gradient(transparent, rgba(255, 253, 245, 0.52), transparent);
  z-index: 3;
}

.lane-title {
  position: absolute;
  top: 22px;
  z-index: 3;
  padding: 7px 10px;
  background: rgba(255, 253, 245, 0.72);
  border: 1px solid rgba(18, 21, 17, 0.12);
  border-radius: 6px;
  color: var(--ink);
  font-size: clamp(13px, 1.4vw, 19px);
  font-weight: 1000;
}

.lane-a {
  left: 24px;
  color: var(--a);
}

.lane-b {
  right: 24px;
  color: var(--b);
}

.palm-zone {
  position: absolute;
  top: 72px;
  z-index: 3;
  width: clamp(72px, 9vw, 112px);
  height: clamp(118px, 18vw, 190px);
  border: 2px solid rgba(18, 21, 17, 0.55);
  border-radius: 20px;
  background: rgba(255, 253, 245, 0.18);
}

.zone-a {
  left: clamp(18px, 4vw, 64px);
}

.zone-b {
  right: clamp(18px, 4vw, 64px);
}

#trailCanvas {
  position: absolute;
  inset: 0;
  z-index: 4;
  width: 100%;
  height: 100%;
}

.center-start {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 5;
  display: none;
  min-width: min(420px, 76%);
  min-height: clamp(108px, 17vw, 172px);
  padding: 0 42px;
  border: 3px solid rgba(255, 253, 245, 0.9);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(18, 21, 17, 0.92), rgba(36, 49, 28, 0.86)),
    var(--ink);
  color: var(--warn);
  font-size: clamp(58px, 10vw, 132px);
  font-weight: 1000;
  line-height: 0.9;
  letter-spacing: 0;
  text-shadow:
    0 5px 18px rgba(18, 21, 17, 0.54),
    0 0 30px rgba(255, 242, 0, 0.52);
  box-shadow:
    0 0 0 8px rgba(255, 242, 0, 0.1),
    0 18px 52px rgba(18, 21, 17, 0.38),
    0 0 54px rgba(255, 242, 0, 0.22);
  cursor: pointer;
  transform: translate(-50%, -50%) scale(0.96);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.center-start.is-visible {
  display: block;
  animation: startBreath 1200ms ease-in-out infinite alternate;
}

.center-start:hover {
  transform: translate(-50%, -50%) scale(1);
  box-shadow:
    0 0 0 10px rgba(255, 242, 0, 0.14),
    0 22px 60px rgba(18, 21, 17, 0.42),
    0 0 70px rgba(255, 242, 0, 0.34);
}

.countdown-overlay {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: none;
  place-items: center;
  color: #fffdf5;
  font-size: clamp(96px, 18vw, 220px);
  font-weight: 1000;
  line-height: 1;
  text-shadow:
    0 8px 28px rgba(18, 21, 17, 0.38),
    0 0 36px rgba(241, 11, 116, 0.44);
  pointer-events: none;
}

.countdown-overlay.is-visible {
  display: grid;
}

.countdown-overlay.is-go {
  color: var(--warn);
  font-size: clamp(72px, 12vw, 152px);
}

.result-overlay {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: none;
  place-items: center;
  padding: 28px;
  text-align: center;
  pointer-events: none;
}

.result-overlay.is-visible {
  display: grid;
}

.result-overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(18, 21, 17, 0.64) 0 50%, rgba(255, 253, 245, 0.04) 50% 100%),
    radial-gradient(circle at var(--winner-x, 50%) 50%, rgba(255, 255, 255, 0.34), transparent 32%);
  opacity: 0;
  animation: resultWash 1100ms ease forwards;
}

.arena.winner-a .result-overlay::before {
  background:
    linear-gradient(90deg, rgba(255, 253, 245, 0.04) 0 50%, rgba(18, 21, 17, 0.72) 50% 100%),
    radial-gradient(circle at var(--winner-x, 50%) 50%, rgba(255, 255, 255, 0.34), transparent 32%);
}

.arena.winner-b .result-overlay::before {
  background:
    linear-gradient(90deg, rgba(18, 21, 17, 0.72) 0 50%, rgba(255, 253, 245, 0.04) 50% 100%),
    radial-gradient(circle at var(--winner-x, 50%) 50%, rgba(255, 255, 255, 0.34), transparent 32%);
}

.result-overlay span,
.result-overlay strong {
  position: relative;
  display: block;
  transform: translateY(24px) scale(0.88);
  opacity: 0;
  animation: resultPop 760ms cubic-bezier(.16, 1.2, .24, 1) forwards;
}

.result-overlay span {
  color: #fffdf5;
  font-size: clamp(18px, 2vw, 30px);
  font-weight: 1000;
  text-shadow: 0 4px 18px rgba(18, 21, 17, 0.42);
}

.result-overlay strong {
  margin-top: 6px;
  color: var(--result-color, var(--warn));
  font-size: clamp(54px, 10vw, 150px);
  font-weight: 1000;
  line-height: 0.9;
  text-shadow:
    0 8px 24px rgba(18, 21, 17, 0.36),
    0 0 22px var(--result-glow, rgba(255, 242, 0, 0.58)),
    0 0 72px var(--result-glow, rgba(255, 242, 0, 0.58));
  animation-delay: 90ms;
}

.burst-layer {
  position: absolute;
  inset: 0;
  z-index: 5;
  overflow: hidden;
  pointer-events: none;
}

.spark {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: var(--spark-color, #fff200);
  box-shadow:
    0 0 12px var(--spark-color, #fff200),
    0 0 34px var(--spark-color, #fff200);
  animation: sparkFly 980ms cubic-bezier(.1, .82, .2, 1) forwards;
}

.player-panel.is-winner {
  animation: panelWin 1200ms ease both;
}

.player-panel.is-loser {
  filter: grayscale(1);
  opacity: 0.46;
}

@keyframes resultPop {
  62% {
    transform: translateY(-8px) scale(1.04);
    opacity: 1;
  }
  100% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

@keyframes resultWash {
  to {
    opacity: 1;
  }
}

@keyframes sparkFly {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.3);
  }
  16% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(calc(var(--dx) - 50%), calc(var(--dy) - 50%)) scale(1.1);
  }
}

@keyframes panelWin {
  0%, 100% {
    transform: translateY(0) scale(1);
  }
  40% {
    transform: translateY(-6px) scale(1.025);
    box-shadow: 0 0 34px var(--panel-glow, rgba(255, 242, 0, 0.42)), var(--shadow);
  }
}

@keyframes startBreath {
  to {
    transform: translate(-50%, -50%) scale(1);
    filter: brightness(1.08);
  }
}

.player-panel {
  display: grid;
  align-content: space-between;
  gap: 18px;
  min-height: 100%;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.player-panel > div {
  display: grid;
  gap: 8px;
}

.player-panel span {
  font-size: 15px;
  font-weight: 1000;
}

.player-panel em {
  min-height: 24px;
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
  font-weight: 900;
}

.player-a span,
.player-a strong {
  color: var(--a);
}

.player-b span,
.player-b strong {
  color: #0582a0;
}

.player-panel strong {
  font-size: clamp(64px, 8vw, 104px);
  line-height: 0.88;
  font-variant-numeric: tabular-nums;
}

.player-panel dl {
  display: grid;
  gap: 12px;
  margin: 0;
}

.player-panel dl div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}

.player-panel dt {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.player-panel dd {
  min-width: 34px;
  margin: 0;
  font-size: 18px;
  font-weight: 1000;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.player-panel dl div::after {
  content: "";
  grid-column: 1 / -1;
  height: 8px;
  background:
    linear-gradient(90deg, currentColor var(--meter, 0%), transparent 0),
    repeating-linear-gradient(90deg, rgba(18, 21, 17, 0.16) 0 2px, transparent 2px 5px);
}

.player-a dl div::after {
  color: var(--a);
}

.player-b dl div::after {
  color: var(--b);
}

.asset-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 1080px) {
  .hero,
  .arena-wrap {
    grid-template-columns: 1fr;
  }

  .round-console {
    grid-template-columns: auto auto auto 1fr 1fr;
  }

  .player-panel {
    grid-template-columns: 180px 1fr;
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .pk-shell {
    padding: 14px;
  }

  .topbar {
    flex-wrap: wrap;
  }

  .topbar span {
    width: 100%;
    margin-left: 0;
  }

  .round-console,
  .player-panel {
    grid-template-columns: 1fr 1fr;
  }

  .timer,
  .winner {
    grid-column: span 1;
  }

  .arena {
    min-height: 520px;
  }

  .player-panel strong {
    font-size: 58px;
  }
}