:root {
  color-scheme: dark;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --backdrop-dark: #050608;
  --backdrop-light: #0f172a;
  color: #f1f5f9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  overflow: hidden;
  background: var(--backdrop-dark);
}

.backdrop {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top, rgba(148, 163, 184, 0.15), transparent 60%),
    var(--backdrop-dark);
  filter: blur(40px) saturate(120%);
  transform: scale(1.1);
  transition: background 1.2s ease, filter 1.2s ease;
  z-index: 0;
}

main {
  position: relative;
  width: 100vw;
  height: 100vh;
  z-index: 1;
}

header {
  position: fixed;
  top: max(1.5rem, env(safe-area-inset-top) + 1rem);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  z-index: 3;
  pointer-events: none;
  text-shadow: 0 18px 32px rgba(0, 0, 0, 0.7);
}

header h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

#status {
  margin-top: 0.3rem;
  opacity: 0.85;
  font-size: clamp(0.9rem, 2vw, 1.1rem);
}

#slideshow {
  position: fixed;
  inset: 0;
}

.slides {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 1.6s ease-in-out;
}

.slide.visible {
  opacity: 1;
}

.slide img {
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  object-position: center;
  image-rendering: auto;
  background: transparent;
}

.controls {
  position: fixed;
  bottom: max(1.5rem, env(safe-area-inset-bottom) + 1.2rem);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 4vw, 2.5rem);
  z-index: 3;
  text-shadow: 0 18px 40px rgba(0, 0, 0, 0.75);
}

.controls button {
  cursor: pointer;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.25);
  color: inherit;
  font-size: clamp(1.1rem, 3vw, 1.8rem);
  border-radius: 999px;
  width: clamp(2.5rem, 7vw, 3.6rem);
  height: clamp(2.5rem, 7vw, 3.6rem);
  display: grid;
  place-items: center;
  transition: background 0.2s ease, transform 0.2s ease;
}

.controls button:hover {
  background: rgba(30, 41, 59, 0.75);
  transform: translateY(-2px);
}

.controls button:active {
  background: rgba(51, 65, 85, 0.82);
  transform: translateY(0);
}

#caption {
  min-width: clamp(180px, 40vw, 360px);
  text-align: center;
  font-size: clamp(0.95rem, 2.2vw, 1.2rem);
}

.hidden {
  display: none;
}

@media (max-width: 600px) {
  header h1 {
    font-size: clamp(1.6rem, 6vw, 2.4rem);
  }
  #caption {
    font-size: clamp(0.85rem, 3.5vw, 1.1rem);
  }
}