:root {
  --ink: #070914;
  --cyan: #64f4ff;
  --violet: #9185ff;
  --pink: #ff4f92;
  --amber: #ffd166;
  --stage-w: min(100vw, 177.78vh);
  --stage-w: min(100vw, 177.78dvh);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    radial-gradient(90% 100% at 50% -15%, #1b2350 0%, transparent 55%),
    radial-gradient(65% 70% at 8% 100%, #25163b 0%, transparent 60%),
    radial-gradient(65% 70% at 94% 88%, #062d3a 0%, transparent 55%),
    #05060d;
  color: #f4f7ff;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.page-glow,
.page-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.page-glow {
  background: radial-gradient(ellipse at center, transparent 45%, rgba(1, 3, 9, 0.78) 100%);
  z-index: 1;
}

.page-grid {
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(120, 220, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 220, 255, 0.08) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, black 15%, transparent 75%);
  transform: perspective(700px) rotateX(58deg) translateY(34%) scale(1.55);
  transform-origin: center 80%;
}

.stage {
  position: relative;
  z-index: 2;
  width: var(--stage-w);
  max-width: 1920px;
  aspect-ratio: 16 / 9;
  max-height: 100dvh;
  overflow: hidden;
  border: 1px solid rgba(124, 213, 255, 0.2);
  border-radius: clamp(0px, 1.2vw, 22px);
  background: #070914;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.7),
    0 30px 110px rgba(0, 0, 0, 0.75),
    0 0 90px rgba(61, 132, 255, 0.12);
  isolation: isolate;
}

.stage::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 8;
  pointer-events: none;
  border-radius: inherit;
  box-shadow: inset 0 0 90px rgba(0, 0, 0, 0.52);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), transparent 10%, transparent 90%, rgba(0, 0, 0, 0.3));
  mix-blend-mode: screen;
  opacity: 0.55;
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
  outline: none;
}

/* ---------- loading ---------- */
.loading {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 18px;
  background:
    radial-gradient(55% 80% at 50% 48%, rgba(22, 33, 82, 0.82), transparent 70%),
    linear-gradient(145deg, #050710, #0a1022 56%, #071219);
  transition: opacity 0.55s ease, visibility 0.55s ease;
}

.loading.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading__eyebrow {
  color: rgba(141, 232, 255, 0.68);
  font-family: Bahnschrift, "Arial Narrow", sans-serif;
  font-size: clamp(8px, 0.9vw, 14px);
  font-weight: 700;
  letter-spacing: 0.46em;
}

.loading__logo {
  padding-left: 0.12em;
  background: linear-gradient(105deg, #ffffff 12%, #6ff5ff 48%, #9d8bff 82%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-family: Bahnschrift, "Arial Black", Impact, sans-serif;
  font-size: clamp(38px, 7.8vw, 122px);
  font-weight: 900;
  letter-spacing: 0.1em;
  line-height: 0.95;
  filter: drop-shadow(0 0 26px rgba(76, 220, 255, 0.22));
}

.loading__bar {
  position: relative;
  width: clamp(180px, 26vw, 380px);
  height: 3px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.12);
}

.loading__bar span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #56efff, #9185ff, #ff5b99);
  box-shadow: 0 0 14px rgba(99, 242, 255, 0.75);
  transition: width 0.18s ease;
}

.loading__text {
  color: rgba(220, 238, 255, 0.56);
  font-size: clamp(10px, 0.9vw, 14px);
  letter-spacing: 0.18em;
}

/* ---------- portrait warning ---------- */
.rotate-notice {
  display: none;
}

@media (orientation: portrait) and (max-width: 760px) {
  .rotate-notice {
    position: absolute;
    inset: 0;
    z-index: 30;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 11px;
    padding: 28px;
    text-align: center;
    background:
      radial-gradient(65% 50% at 50% 46%, rgba(22, 36, 87, 0.9), transparent 75%),
      #070a14;
  }

  .rotate-notice strong {
    font-size: 22px;
    letter-spacing: 0.14em;
  }

  .rotate-notice span {
    color: rgba(198, 223, 255, 0.55);
    font-size: 12px;
    letter-spacing: 0.08em;
  }

  .rotate-notice__phone {
    width: 42px;
    height: 68px;
    margin-bottom: 12px;
    border: 2px solid rgba(117, 236, 255, 0.85);
    border-radius: 9px;
    box-shadow: 0 0 24px rgba(91, 226, 255, 0.24);
    animation: turn-phone 2.2s ease-in-out infinite;
  }
}

@keyframes turn-phone {
  0%,
  28% {
    transform: rotate(0deg);
  }
  65%,
  100% {
    transform: rotate(90deg);
  }
}

/* ---------- utility ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (max-height: 540px) {
  .stage {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rotate-notice__phone {
    animation: none;
  }
}