* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  min-height: 100%;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(60, 90, 160, 0.35), transparent 55%),
    radial-gradient(ellipse at 80% 80%, rgba(40, 20, 60, 0.5), transparent 50%),
    #0a0714;
  color: #e8f0ff;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}
.hub {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px 20px 40px;
  gap: 18px;
  text-align: center;
}
h1 {
  font-size: clamp(2.6rem, 12vw, 4rem);
  letter-spacing: 0.18em;
  font-weight: 800;
  text-indent: 0.18em;
}
.tag { opacity: 0.7; font-size: 0.95rem; letter-spacing: 0.06em; }
.modes {
  width: min(420px, 100%);
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 12px;
}
.mode {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px;
  text-decoration: none;
  color: inherit;
  border: 1px solid rgba(140, 180, 240, 0.35);
  background: rgba(12, 18, 36, 0.75);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.mode:active { transform: scale(0.98); }
.mode.fly { border-color: rgba(120, 200, 255, 0.55); }
.mode.watch { border-color: rgba(255, 190, 100, 0.45); }
.mode .label {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.22em;
}
.mode .hint { font-size: 0.9rem; opacity: 0.75; }
.foot { margin-top: 8px; font-size: 0.8rem; opacity: 0.5; }