:root {
  --bg: #313131;
  --primary: #ff8a00;
  --text: #ff8a00;
  --muted: #707070;
  --font: "Segoe UI", "Segoe UI Variable", system-ui, sans-serif;
}

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

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-x: clip;
}

.atmosphere {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(36px);
}

.orb-a {
  width: min(46vw, 340px);
  height: min(46vw, 340px);
  top: 8%;
  left: -8%;
  background: rgba(255, 138, 0, 0.22);
  animation: drift 16s ease-in-out infinite;
}

.orb-b {
  width: min(38vw, 260px);
  height: min(38vw, 260px);
  right: -6%;
  bottom: 6%;
  background: rgba(255, 138, 0, 0.12);
  animation: drift 20s ease-in-out infinite reverse;
}

.orb-c {
  width: min(28vw, 180px);
  height: min(28vw, 180px);
  top: 18%;
  right: 16%;
  background: rgba(112, 112, 112, 0.28);
  animation: drift 18s ease-in-out infinite;
}

.grid-glow {
  position: absolute;
  inset: auto 0 0;
  height: 42%;
  background:
    linear-gradient(rgba(255, 138, 0, 0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 138, 0, 0.1) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  opacity: 0.45;
}

.holding {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.25rem;
}

.holding-inner {
  width: min(40rem, 100%);
  text-align: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
  color: var(--primary);
  font-weight: 600;
  letter-spacing: 0.16em;
  font-size: 0.98rem;
}

.logo {
  width: 76px;
  height: 76px;
  display: block;
  object-fit: contain;
}

h1 {
  margin: 0 0 1rem;
  color: var(--primary);
  font-size: clamp(1.9rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  font-weight: 600;
}

.lead {
  margin: 0 auto 1.35rem;
  max-width: 34rem;
  color: var(--muted);
  font-size: 1.125rem;
}

.slogan {
  margin: 0 0 1.75rem;
  color: var(--primary);
  font-size: 1.05rem;
}

.mail {
  margin: 0;
  color: var(--muted);
}

.mail a {
  color: var(--primary);
  text-decoration: none;
}

.mail a:hover,
.mail a:focus-visible,
.home a:hover,
.home a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.home {
  margin: 0;
}

.home a {
  color: var(--primary);
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(14px, -18px, 0);
  }
}

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

@media (max-width: 520px) {
  .holding {
    padding: 2.25rem 1rem;
  }

  .brand {
    letter-spacing: 0.12em;
  }
}