* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: #000;
  color: #fff;
  font-family: 'Georgia', serif;
  height: 100vh;
  overflow: hidden;
}

.slide img:not(.logo) { border-radius: 12px; }

.slide {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  width: 100vw;
  padding: 60px 120px;
}

.section-label, .note-label {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: rgba(255,255,255,0.35);
}
.section-label { font-size: 11px; }

h1 {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 400;
  text-align: center;
  line-height: 1.4;
  color: #fff;
  letter-spacing: 0.01em;
}

h1 em {
  color: rgba(255,255,255,0.7);
  font-style: italic;
}

.subtitle {
  font-size: clamp(1rem, 1.8vw, 1.35rem);
  color: rgba(255,255,255,0.5);
  font-style: italic;
  text-align: center;
  letter-spacing: 0.3px;
}

.authors {
  font-size: clamp(0.85rem, 1.4vw, 1.1rem);
  color: rgba(255,255,255,0.55);
  text-align: center;
  letter-spacing: 0.5px;
  line-height: 1.8;
}

.sub {
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: rgba(255,255,255,0.5);
  text-align: center;
  line-height: 1.6;
  max-width: 700px;
}

.center-img {
  max-height: 42vh;
  max-width: 80%;
  border-radius: 8px;
}

.caption {
  font-size: clamp(0.9rem, 1.4vw, 1.1rem);
  color: rgba(255,255,255,0.55);
  text-align: center;
  font-style: italic;
  line-height: 1.6;
  max-width: 700px;
}

.body-text {
  font-size: clamp(0.85rem, 1.3vw, 1.05rem);
  color: rgba(255,255,255,0.6);
  text-align: center;
  line-height: 1.7;
  max-width: 750px;
}

.img-row {
  display: flex;
  gap: 24px;
  align-items: stretch;
  justify-content: center;
  height: 50vh;
}
.img-row img {
  height: 100%;
  width: auto;
  object-fit: contain;
  border-radius: 8px;
}

.content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  max-width: 950px;
}

.demos {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
}
.demo-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.demo-num {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.35);
  min-width: 24px;
}
.demo-title {
  font-size: clamp(1rem, 1.8vw, 1.3rem);
  color: rgba(255,255,255,0.75);
  line-height: 1.5;
}
.demo-title span {
  color: rgba(255,255,255,0.4);
  font-size: 0.85em;
}

/* ---- Slide 01 ---- */
.s01-slide    { padding: 80px 160px; position: relative; }
.s01-content  { gap: 0; position: relative; z-index: 1; }
.s01-title    { margin-top: -260px; font-size: clamp(2.2rem, 4.5vw, 3.8rem); text-shadow: 0 0 4px rgba(0,0,0,1), 0 0 12px rgba(0,0,0,1), 0 0 24px rgba(0,0,0,1), 0 0 48px rgba(0,0,0,1); }
.s01-subtitle { margin-top: 16px; text-shadow: 0 0 4px rgba(0,0,0,1), 0 0 12px rgba(0,0,0,1), 0 0 24px rgba(0,0,0,1), 0 0 48px rgba(0,0,0,1); }
.s01-authors  { margin-top: 320px; display: grid; grid-template-columns: 1fr 1fr; column-gap: 48px; row-gap: 6px; text-align: left; text-shadow: 0 0 8px rgba(0,0,0,1), 0 0 16px rgba(0,0,0,1); }

/* Fixed chrome */
.slide-indicator {
  position: fixed;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  font-family: monospace;
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  letter-spacing: 1px;
  z-index: 10;
}
.logo {
  position: fixed; bottom: 18px; left: 18px; height: 36px; width: auto; z-index: 10;
}
.badge {
  position: fixed; bottom: 18px; right: 18px;
  display: flex; flex-direction: column; align-items: flex-end; gap: 2px; z-index: 10;
}
.badge-top {
  color: #fff; font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 700; font-size: 11px; letter-spacing: 1px;
}
.badge-bot {
  color: rgba(255,255,255,0.55); font-family: 'IBM Plex Sans', sans-serif;
  font-size: 8px; text-transform: uppercase; letter-spacing: 0.5px;
}