:root {
  color-scheme: light;
  --bg: #fdfbf6;
  --bg-secondary: #f6f3ed;
  --ink: rgba(20, 20, 20, 0.9);
  --muted: #918a82;
  --accent: #0f3952;
  --pointer-x: 50vw;
  --pointer-y: 50vh;
  --pointer-strength: 0.3;
  --pointer-opacity: 0;
  --wind-x: 0;
  --wind-y: 0;
  --tempo: 0;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg), var(--bg-secondary));
  color: var(--ink);
  letter-spacing: 0.02em;
  cursor: none;
  overflow-x: hidden;
  position: relative;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle at 50% 50%, rgba(15, 57, 82, 0.05) 0, transparent 60%),
    linear-gradient(to right, rgba(15, 57, 82, 0.03) 0 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 57, 82, 0.02) 0 1px, transparent 1px);
  background-size: cover, 120px 120px, 120px 120px;
  mix-blend-mode: multiply;
  pointer-events: none;
  z-index: -1;
}

.halo {
  position: fixed;
  top: var(--pointer-y);
  left: var(--pointer-x);
  width: clamp(180px, calc(var(--pointer-strength) * 320px), 460px);
  height: clamp(180px, calc(var(--pointer-strength) * 320px), 460px);
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: var(--pointer-opacity);
  mix-blend-mode: screen;
  transition: opacity 0.65s ease;
  z-index: 1;
}

.halo::before,
.halo::after {
  content: "";
  position: absolute;
  inset: -15%;
  border-radius: 999px;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.55), transparent 70%);
  filter: blur(18px);
}

.halo::after {
  inset: 15%;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.4), transparent 65%);
  filter: blur(8px);
}

.stage {
  position: relative;
  display: grid;
  gap: clamp(48px, 9vw, 112px);
  min-height: 100vh;
  padding: clamp(32px, 8vw, 120px) clamp(24px, 10vw, 180px) clamp(48px, 12vw, 160px);
  z-index: 2;
}

.hero {
  max-width: 720px;
  display: grid;
  gap: clamp(12px, 2.4vw, 28px);
}

.hero__tag {
  margin: 0;
  font-size: clamp(0.68rem, 1vw, 0.85rem);
  letter-spacing: 0.46em;
  text-transform: uppercase;
  color: rgba(15, 57, 82, 0.55);
}

.hero__title {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 4.8rem);
  font-weight: 300;
  letter-spacing: 0.2em;
  line-height: 1.2;
}

.hero__title span {
  display: block;
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  letter-spacing: 0.6em;
  text-transform: uppercase;
  color: rgba(15, 57, 82, 0.45);
}

.hero__lead {
  margin: 0;
  line-height: 1.9;
  color: rgba(20, 20, 20, 0.68);
}

.field {
  position: relative;
  border-radius: clamp(24px, 5vw, 48px);
  border: 1px solid rgba(15, 57, 82, 0.1);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  box-shadow: 0 32px 120px rgba(15, 57, 82, 0.14);
  overflow: hidden;
  isolation: isolate;
  min-height: clamp(380px, 56vw, 640px);
}

.field::before {
  content: "";
  position: absolute;
  inset: 12%;
  border-radius: clamp(24px, 6vw, 56px);
  border: 1px dashed rgba(15, 57, 82, 0.16);
  opacity: 0.4;
  pointer-events: none;
}

.field__canvas {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.glyph {
  position: absolute;
  font-size: var(--size, 2rem);
  font-weight: 200;
  letter-spacing: 0.4em;
  color: rgba(15, 57, 82, 0.16);
  text-shadow: 0 14px 36px rgba(15, 57, 82, 0.12);
  pointer-events: none;
  animation: float var(--duration, 22s) ease-in-out var(--delay, 0s) infinite alternate;
  transform: translate(-50%, -50%) translate3d(0, 0, 0);
  opacity: var(--alpha, 0.6);
  mix-blend-mode: multiply;
}

.glyph:nth-child(3n) {
  mix-blend-mode: screen;
  color: rgba(15, 57, 82, 0.25);
}

.field__panel {
  position: absolute;
  bottom: clamp(24px, 5vw, 48px);
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  gap: 12px;
  padding: clamp(16px, 4vw, 28px) clamp(20px, 6vw, 36px);
  border-radius: 28px;
  border: 1px solid rgba(15, 57, 82, 0.14);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 24px 64px rgba(15, 57, 82, 0.12);
}

.field__status {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.3rem);
  letter-spacing: 0.2em;
  color: rgba(20, 20, 20, 0.72);
}

.field__hint {
  margin: 0;
  font-size: clamp(0.72rem, 1.2vw, 0.9rem);
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(15, 57, 82, 0.5);
}

.hero--footer {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  color: rgba(20, 20, 20, 0.65);
  line-height: 1.9;
}

.ripple {
  position: fixed;
  top: 0;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 999px;
  border: 1px solid rgba(15, 57, 82, 0.4);
  transform: translate(-50%, -50%) scale(1);
  opacity: 0;
  pointer-events: none;
  animation: ripple 1.6s ease-out forwards;
  mix-blend-mode: multiply;
  z-index: 3;
}

.spark {
  position: fixed;
  top: 0;
  left: 0;
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  letter-spacing: 0.3em;
  color: rgba(15, 57, 82, 0.55);
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.4);
  opacity: 0;
  transition: transform 1.1s cubic-bezier(0.22, 0.61, 0.36, 1), opacity 1.1s ease;
  mix-blend-mode: multiply;
  z-index: 3;
}

.spark.is-active {
  transform: translate(-50%, -50%) scale(1.75);
  opacity: 0.65;
}

@keyframes float {
  0% {
    transform: translate(-50%, -50%) translate3d(0, 0, 0) rotate(0deg);
    filter: blur(0);
  }
  40% {
    transform: translate(-50%, -50%) translate3d(calc(var(--wind-x, 0) * 18px), calc(var(--wind-y, 0) * 18px), 0)
      rotate(2deg);
  }
  100% {
    transform: translate(-50%, -50%)
      translate3d(calc(var(--drift-x, 18px) + var(--wind-x, 0) * 22px), calc(var(--drift-y, -18px) + var(--wind-y, 0) * 22px), 0)
      rotate(var(--spin, -4deg));
    filter: blur(var(--blur, 0px));
  }
}

@keyframes ripple {
  0% {
    opacity: 0.7;
    transform: translate(-50%, -50%) scale(1);
  }
  70% {
    opacity: 0.25;
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(18);
  }
}

@media (hover: none) and (pointer: coarse) {
  body {
    cursor: default;
  }

  .halo {
    display: none;
  }
}

@media (max-width: 860px) {
  .stage {
    padding: clamp(24px, 10vw, 80px);
  }

  .field__panel {
    left: 50%;
    transform: translate(-50%, 0);
  }
}

@media (max-width: 540px) {
  .field {
    min-height: clamp(320px, 70vh, 520px);
  }

  .field__panel {
    width: calc(100% - clamp(48px, 12vw, 80px));
  }
}