:root {
  color-scheme: dark;
  --blade-width: clamp(52px, 15vw, 68px);
  --pulse: 1;
  --flicker: 1;
  --red: 255, 12, 18;
}

html,
body {
  width: 100%;
  min-width: 320px;
  min-height: 100%;
  background: #000;
  overflow: hidden;
}

body {
  min-height: 100svh;
}

.site {
  position: relative;
  isolation: isolate;
  width: 100%;
  height: 100svh;
  min-height: 520px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(62, 0, 2, 0.14) 0, transparent 32%),
    linear-gradient(90deg, #000 0 49.8%, #050000 50%, #000 50.2% 100%);
}

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

.atmosphere,
.saber,
.grain,
.vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.atmosphere {
  z-index: 0;
  left: 50%;
  width: min(140vw, 980px);
  transform: translateX(-50%);
  background: linear-gradient(90deg,
    transparent 0,
    rgba(70, 0, 2, 0.025) 20%,
    rgba(105, 0, 3, 0.07) 34%,
    rgba(145, 0, 4, 0.13) 44%,
    rgba(180, 0, 5, 0.18) 50%,
    rgba(145, 0, 4, 0.13) 56%,
    rgba(105, 0, 3, 0.07) 66%,
    rgba(70, 0, 2, 0.025) 80%,
    transparent 100%);
  filter: blur(70px);
  opacity: calc(0.72 * var(--pulse));
  animation: atmosphere-breathe 5.7s ease-in-out infinite;
}

.saber {
  z-index: 1;
  left: 50%;
  width: var(--blade-width);
  transform: translateX(-50%);
  overflow: visible;
}

.saber__aura,
.saber__field,
.saber__blade {
  position: absolute;
  top: -12vh;
  bottom: -12vh;
  left: 50%;
  transform: translateX(-50%);
}

.saber__aura {
  width: 900%;
  background: linear-gradient(90deg,
    transparent 0,
    rgba(var(--red), 0.012) 16%,
    rgba(var(--red), 0.035) 28%,
    rgba(var(--red), 0.085) 39%,
    rgba(var(--red), 0.17) 47%,
    rgba(var(--red), 0.2) 50%,
    rgba(var(--red), 0.17) 53%,
    rgba(var(--red), 0.085) 61%,
    rgba(var(--red), 0.035) 72%,
    rgba(var(--red), 0.012) 84%,
    transparent 100%);
  filter: blur(68px);
  opacity: calc(0.82 * var(--pulse));
  animation: aura-pulse 3.9s ease-in-out infinite;
}

.saber__field {
  width: 340%;
  background: linear-gradient(90deg,
    transparent 0,
    rgba(var(--red), 0.045) 14%,
    rgba(var(--red), 0.11) 28%,
    rgba(var(--red), 0.25) 41%,
    rgba(var(--red), 0.39) 50%,
    rgba(var(--red), 0.25) 59%,
    rgba(var(--red), 0.11) 72%,
    rgba(var(--red), 0.045) 86%,
    transparent 100%);
  filter: blur(24px);
  opacity: calc(0.86 * var(--pulse));
}

.saber__blade {
  width: 100%;
  overflow: hidden;
  background:
    linear-gradient(90deg,
      rgba(255, 0, 8, 0) 0,
      rgba(255, 0, 8, 0.52) 7%,
      #ff1820 15%,
      #ff5359 24%,
      #ffa3a6 33%,
      #ffe9ea 41%,
      #fff 48%,
      #fff 52%,
      #ffe9ea 59%,
      #ffa3a6 67%,
      #ff5359 76%,
      #ff1820 85%,
      rgba(255, 0, 8, 0.52) 93%,
      rgba(255, 0, 8, 0) 100%);
  filter: brightness(var(--flicker));
}

.saber__blade::before {
  content: "";
  position: absolute;
  inset: 0 34%;
  background: rgba(255, 255, 255, 0.72);
  filter: blur(3px);
  mix-blend-mode: screen;
  opacity: 0.82;
}

.plasma {
  position: absolute;
  z-index: 1;
  top: 0;
  left: -35%;
  width: 170%;
  height: var(--plasma-height, 6%);
  background: linear-gradient(180deg,
    transparent 0,
    rgba(255, 36, 45, 0.035) 14%,
    rgba(255, 82, 89, 0.14) 32%,
    rgba(255, 255, 255, 0.4) 48%,
    rgba(255, 235, 237, 0.27) 57%,
    rgba(255, 54, 63, 0.1) 72%,
    transparent 100%);
  filter: blur(var(--plasma-blur, 9px));
  mix-blend-mode: normal;
  opacity: 0;
  transform: translateY(var(--plasma-start, -18vh)) skewY(var(--plasma-start-tilt, -6deg));
}

.plasma.is-active {
  animation: plasma-flash var(--plasma-duration, 900ms) cubic-bezier(.2, .62, .38, 1) 1;
}

.runes {
  position: absolute;
  z-index: 3;
  top: 50%;
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  width: calc(var(--blade-width) * 0.145);
  height: 63svh;
  overflow: visible;
  transform: translate(-50%, -50%);
  filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.8));
}

.rune {
  flex: 0 0 auto;
  width: 100%;
  height: auto;
  overflow: visible;
  fill: none;
  stroke: #a0000c;
  stroke-width: 5.5;
  stroke-linecap: square;
  stroke-linejoin: miter;
  opacity: 0;
}

.rune circle {
  fill: #a0000c;
  stroke: none;
}

.rune.is-lit {
  animation: rune-ignite var(--rune-duration, 8700ms) cubic-bezier(.16, .7, .2, 1) 1;
}

.studio-mark {
  position: absolute;
  z-index: 6;
  left: max(12px, env(safe-area-inset-left));
  bottom: max(10px, env(safe-area-inset-bottom));
  margin: 0;
  color: rgba(158, 154, 154, 0.58);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: clamp(9px, 2.4vw, 11px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.08em;
  white-space: nowrap;
  user-select: none;
}

.grain {
  z-index: 4;
  inset: -50%;
  width: 200%;
  height: 200%;
  opacity: 0.036;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
  animation: grain-shift 0.22s steps(2) infinite;
}

.vignette {
  z-index: 5;
  background: linear-gradient(90deg,
    rgba(0, 0, 0, 0.7) 0,
    transparent 18%,
    transparent 82%,
    rgba(0, 0, 0, 0.7) 100%);
}

@keyframes atmosphere-breathe {
  0%, 100% { transform: translateX(-50%) scaleX(0.94); }
  50% { transform: translateX(-50%) scaleX(1.06); }
}

@keyframes aura-pulse {
  0%, 100% { opacity: 0.64; transform: translateX(-50%) scaleX(0.96); }
  50% { opacity: 0.88; transform: translateX(-50%) scaleX(1.05); }
}

@keyframes plasma-flash {
  0% {
    opacity: 0;
    transform: translateY(var(--plasma-start)) skewY(var(--plasma-start-tilt));
  }
  12% { opacity: var(--plasma-opacity, 0.5); }
  48% { opacity: var(--plasma-opacity-low, 0.18); }
  76% { opacity: var(--plasma-opacity-mid, 0.38); }
  100% {
    opacity: 0;
    transform: translateY(var(--plasma-end)) skewY(var(--plasma-end-tilt));
  }
}

@keyframes rune-ignite {
  0%, 100% { opacity: 0; filter: none; }
  3% { opacity: 0.375; filter: drop-shadow(0 0 2px rgba(255, 36, 43, 0.42)); }
  5% { opacity: 0.06; }
  8% { opacity: 0.465; filter: drop-shadow(0 0 3px rgba(255, 24, 32, 0.56)); }
  11% { opacity: 0.143; }
  14% { opacity: 0.405; filter: drop-shadow(0 0 1px rgba(255, 54, 61, 0.3)); }
  32% { opacity: 0.345; }
  52% { opacity: 0.27; }
  72% { opacity: 0.18; }
  89% { opacity: 0.075; }
}

.saber.is-rune-surge .saber__blade {
  animation: rune-blade-flash 3100ms ease-out 1;
}

.saber.is-rune-surge .saber__field {
  animation: rune-field-flash 3100ms ease-out 1;
}

@keyframes rune-blade-flash {
  0%, 100% { filter: brightness(var(--flicker)); }
  8% { filter: brightness(1.14); }
  13% { filter: brightness(0.99); }
  20% { filter: brightness(1.1); }
  31% { filter: brightness(1.01); }
}

@keyframes rune-field-flash {
  0%, 100% { opacity: calc(0.8 * var(--pulse)); }
  9% { opacity: 1; }
  15% { opacity: 0.76; }
  22% { opacity: 0.96; }
  38% { opacity: calc(0.8 * var(--pulse)); }
}

@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  25% { transform: translate(2%, -3%); }
  50% { transform: translate(-3%, 2%); }
  75% { transform: translate(3%, 4%); }
  100% { transform: translate(-2%, -2%); }
}

@media (min-width: 700px) {
  :root {
    --blade-width: clamp(72px, 6vw, 104px);
  }

  .runes {
    width: calc(var(--blade-width) * 0.135);
  }
}

@media (max-height: 620px) {
  .site {
    min-height: 420px;
  }

}

@media (prefers-reduced-motion: reduce) {
  .rune {
    opacity: 0.42;
  }
}