:root {
  --color-bg: #0f1318;
  --color-teal: #3fb8af;
  --color-teal-light: #5cd4cb;
  --color-teal-dark: #2a8a83;
  --font: "Noto Sans JP", sans-serif;
  --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

#particles {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

.page {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
  padding: 2rem;
  animation: fadeIn 1.2s ease-out;
}

.logo-image {
  max-width: 520px;
  width: 90%;
  height: auto;
  filter: drop-shadow(0 0 40px rgba(63, 184, 175, 0.2))
    drop-shadow(0 0 80px rgba(212, 168, 83, 0.1));
  animation: float 6s ease-in-out infinite;
  border-radius: 16px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  background: linear-gradient(135deg, #2a8a83, #3fb8af, #d4a853);
  color: #fff;
  border: none;
  border-radius: 14px;
  padding: 18px 48px;
  font-family: var(--font);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: var(--transition);
  box-shadow:
    0 4px 20px rgba(63, 184, 175, 0.25),
    0 0 30px rgba(212, 168, 83, 0.15);
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.6s ease;
}

.cta-button:hover {
  background: linear-gradient(135deg, #3fb8af, #5cd4cb, #e8c47a);
  box-shadow:
    0 8px 30px rgba(63, 184, 175, 0.3),
    0 0 40px rgba(212, 168, 83, 0.25);
  transform: translateY(-2px);
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(63, 184, 175, 0.2);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 480px) {
  .logo-image {
    max-width: 280px;
  }
  .cta-button {
    padding: 16px 32px;
    font-size: 1rem;
  }
}

.site-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 1;
  text-align: center;
  padding: 1rem;
}

.site-footer p {
  font-family: var(--font);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.35);
  letter-spacing: 0.05em;
}