:root {
  color-scheme: only light;
  --ink: #f6f1e8;
  --ink-soft: rgba(246, 241, 232, 0.78);
  --soil-1: #1c140d;
  --soil-2: #2a1d13;
  --soil-3: #3e2c1b;
  --accent: #c7a36a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 20% 10%, rgba(126, 92, 63, 0.28), transparent 60%),
    radial-gradient(900px 600px at 80% 30%, rgba(64, 46, 32, 0.5), transparent 60%),
    linear-gradient(160deg, var(--soil-1) 0%, var(--soil-2) 45%, var(--soil-3) 100%);
  background-size: 160% 160%, 150% 150%, 120% 120%;
  background-position: 0% 0%, 100% 20%, 50% 50%;
  animation: drift 26s ease-in-out infinite;
  display: grid;
  place-items: center;
}

.stage {
  width: min(92vw, 720px);
  padding: 48px 28px;
}

.card {
  text-align: center;
  padding: 40px 36px 44px;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  backdrop-filter: none;
  animation: card-rise 1.2s ease-out both;
}

.logo-text {
  width: min(340px, 70%);
  height: auto;
  margin-bottom: 18px;
  filter: drop-shadow(0 10px 22px rgba(21, 33, 48, 0.18));
}

.logo-wrap {
  position: relative;
  width: 160px;
  height: 160px;
  margin: 0 auto 16px;
  display: grid;
  place-items: center;
}

.logo {
  width: 120px;
  height: auto;
  animation: float 3.6s ease-in-out infinite;
  z-index: 1;
}

.halo {
  position: absolute;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(199, 163, 106, 0.35), transparent 70%);
  filter: blur(2px);
  animation: glow 4s ease-in-out infinite;
}

.message {
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  line-height: 1.7;
  color: var(--ink-soft);
}

.message span {
  display: block;
  margin-top: 10px;
  font-size: 0.82em;
  letter-spacing: 0.02em;
  color: rgba(246, 241, 232, 0.55);
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes glow {
  0%,
  100% {
    transform: scale(0.95);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.9;
  }
}

@keyframes card-rise {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes drift {
  0%,
  100% {
    background-position: 0% 0%, 100% 20%, 50% 50%;
  }
  50% {
    background-position: 12% 8%, 88% 30%, 45% 55%;
  }
}

@media (max-width: 600px) {
  .card {
    padding: 32px 22px 36px;
  }

  .logo-wrap {
    width: 140px;
    height: 140px;
  }

  .logo {
    width: 104px;
  }
}