/* Theme A: Swiss — minimal, confident, grid, subtle diffusion */
body{
  background:
    radial-gradient(1200px 800px at 15% 20%, rgba(0,51,255,0.12), transparent 60%),
    radial-gradient(1000px 700px at 85% 30%, rgba(0,51,255,0.08), transparent 62%),
    #ffffff;
}

.reveal .slides{max-width: 1600px; margin: 0 auto;}
.reveal h1,.reveal h2{text-transform:none}
.reveal h1{letter-spacing:-0.03em}
.reveal h2{letter-spacing:-0.02em}
.callout{border-left-color:#0033ff}

/* thin baseline for Swiss feel */
.reveal section::after{
  content: ""; position: absolute; left: 0; right: 0; bottom: 5%; height: 1px;
  background: linear-gradient(90deg, rgba(0,0,0,0.08), rgba(0,0,0,0));
}