:root {
  color: #1c1c1c;
  background: #ffffff;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }

body { min-height: 100vh; min-height: 100svh; background: #ffffff; }

.landing {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(24px, 5vw, 72px);
}

.content {
  width: min(100%, 620px);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.logo {
  display: block;
  width: clamp(120px, 23vw, 215px);
  max-width: 52vw;
  height: auto;
  object-fit: contain;
  opacity: 0;
  animation: fade-in 2000ms cubic-bezier(.22, .61, .36, 1) 100ms forwards;
}

.intro {
  margin-top: clamp(19px, 2.4vw, 28px);
  display: grid;
  width: max-content;
  max-width: 100%;
  opacity: 0;
  transform: translateY(9px);
  animation: fade-up 650ms cubic-bezier(.22, .61, .36, 1) 1900ms forwards;
}

h1, p { margin: 0; }

h1,
.company-division {
  color: #222222;
  font-size: clamp(15px, 2.1vw, 20px);
  font-weight: 600;
  letter-spacing: clamp(.08em, .25vw, .14em);
  line-height: 1.4;
}

.tagline {
  margin-top: 8px;
  color: #5e5e5e;
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.5;
}

.company-division {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid #1f5f99;
  color: #3d3d3d;
}

.development {
  margin-top: clamp(42px, 6vw, 56px);
  color: #777777;
  font-size: clamp(14px, 1.8vw, 16px);
  font-weight: 400;
  letter-spacing: .05em;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(9px);
  animation: fade-up 650ms cubic-bezier(.22, .61, .36, 1) 2080ms forwards;
}

.development-english {
  margin-top: 4px;
  font-size: .87em;
  letter-spacing: .025em;
}

@keyframes fade-in { to { opacity: 1; } }
@keyframes fade-up { to { opacity: 1; transform: translateY(0); } }

@media (max-height: 520px) and (orientation: landscape) {
  .landing { padding: 18px; }
  .logo { width: clamp(86px, 20vh, 130px); }
  .intro { margin-top: 12px; }
  .development { margin-top: 22px; }
  h1 { font-size: clamp(13px, 3vh, 16px); }
  .tagline, .development { font-size: clamp(13px, 2.7vh, 15px); }
}

@media (prefers-reduced-motion: reduce) {
  .logo, .intro, .development { opacity: 1; transform: none; animation: none; }
}