:root {
  --bg: #0b0f14;
  --fg: #e8edf2;
  --muted: #8a96a3;
  --line: #1c242d;
}

* { box-sizing: border-box; }

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

body {
  background: var(--bg);
  background-image: radial-gradient(ellipse 60% 45% at 50% 38%, #12202c 0%, var(--bg) 70%);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 4px;
}

.logo { width: 72px; height: auto; margin-bottom: 20px; opacity: 0.95; }

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 650;
  letter-spacing: 0.02em;
}

.tagline { margin: 12px 0 0; font-size: 1.05rem; color: var(--fg); opacity: 0.85; }

.tagline.en { margin-top: 4px; font-size: 0.9rem; color: var(--muted); }

footer {
  width: 100%;
  max-width: 960px;
  padding: 20px 0 28px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
}