:root {
  --navy-950: #04132a;
  --navy-900: #071b3a;
  --navy-850: #0b2350;
  --navy-700: #18408b;
  --navy-500: #2f66c6;
  --cyan-300: #7ad8ff;
  --text-100: #eef5ff;
  --text-300: #b7c8e6;
  --glass: rgba(7, 22, 49, 0.52);
  --line: rgba(129, 176, 255, 0.3);
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--text-100);
  background: radial-gradient(circle at 12% 18%, #1f4f9c 0%, transparent 36%),
    radial-gradient(circle at 85% 10%, #0f2f68 0%, transparent 34%),
    linear-gradient(160deg, var(--navy-950), var(--navy-900) 42%, #050f22 100%);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 1rem;
  padding: 1.2rem;
  overflow-x: hidden;
}

.backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.22;
}

.site-header,
.site-footer,
.slider-shell {
  position: relative;
  z-index: 2;
}

.site-header {
  text-align: center;
  animation: reveal 700ms ease;
}

.brand-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--text-300);
  font-size: 0.74rem;
}

.site-header h1 {
  margin: 0.35rem 0 0.25rem;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(2rem, 4vw, 3.3rem);
  font-weight: 700;
}

.brand-sub {
  margin: 0;
  color: #d4e6ff;
}

.slider-shell {
  width: min(1100px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 0.95rem;
  animation: reveal 900ms ease;
}

.stage-wrap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.8rem;
}

.stage-card {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--glass);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.44);
  backdrop-filter: blur(4px);
}

#mainImage {
  width: 100%;
  max-height: 72vh;
  height: auto;
  object-fit: contain;
  display: block;
  background: #030a18;
}

figcaption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.85rem 1rem 1rem;
}

.caption-title {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.caption-meta {
  margin: 0;
  color: var(--text-300);
  font-size: 0.94rem;
}

.nav-btn {
  border: 1px solid var(--line);
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 999px;
  color: var(--text-100);
  background: rgba(8, 27, 58, 0.82);
  cursor: pointer;
  font-size: 1.3rem;
  transition: transform 140ms ease, background-color 180ms ease;
}

.nav-btn:hover,
.nav-btn:focus-visible {
  transform: scale(1.08);
  background: rgba(24, 64, 139, 0.88);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
}

.control-btn,
.speed-control {
  border: 1px solid var(--line);
  background: rgba(7, 21, 46, 0.72);
  color: var(--text-100);
  border-radius: 999px;
  padding: 0.55rem 0.95rem;
  font-weight: 600;
}

.control-btn {
  cursor: pointer;
}

.control-btn:hover,
.control-btn:focus-visible {
  background: rgba(27, 73, 155, 0.9);
}

.speed-control {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

#speedRange {
  accent-color: var(--cyan-300);
}

.thumbs-wrap {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.65rem;
  background: rgba(3, 12, 29, 0.52);
}

.thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(95px, 1fr));
  gap: 0.5rem;
}

.thumbs-tools {
  margin-top: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.thumbs-info {
  margin: 0;
  color: var(--text-300);
  font-size: 0.88rem;
}

.thumb {
  border: 2px solid transparent;
  border-radius: 12px;
  overflow: hidden;
  padding: 0;
  background: #07152f;
  cursor: pointer;
}

.thumb img {
  width: 100%;
  height: 74px;
  object-fit: cover;
  display: block;
  opacity: 0.84;
  transition: opacity 150ms ease;
}

.thumb.active {
  border-color: #87c4ff;
}

.thumb.active img,
.thumb:hover img {
  opacity: 1;
}

.site-footer {
  text-align: center;
  color: var(--text-300);
  font-size: 0.9rem;
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  body {
    padding: 0.75rem;
  }

  .stage-wrap {
    grid-template-columns: 1fr;
  }

  .nav-btn {
    display: none;
  }

  #mainImage {
    max-height: 58vh;
  }

  figcaption {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }
}