:root {
  --card: 42vmin;          /* carousel square side */
  --accent: #f7a72b;       /* gasoline amber — the brand accent */
  --ink: #f2f6fa;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0a0e14;
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---- background slideshow ---- */
#bg-slideshow { position: fixed; inset: 0; z-index: 0; }
#bg-slideshow .bg-layer {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 2.2s ease-in-out;
}
#bg-slideshow .bg-layer.visible { opacity: 1; }

#bg-tint {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: radial-gradient(ellipse at center, rgba(6,10,18,.25) 0%, rgba(6,10,18,.72) 100%);
  pointer-events: none;
}

/* ---- stage / carousel ---- */
#stage {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  pointer-events: none;
}

#carousel {
  position: relative;
  width: 100vw;
  height: var(--card);
  max-height: 84vh;
  overflow: hidden;
  /* soft fade at the left/right edges so cards appear/vanish gently */
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 7%, #000 93%, transparent 100%);
          mask-image: linear-gradient(90deg, transparent 0, #000 7%, #000 93%, transparent 100%);
}

#carousel .track {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  display: flex;
  gap: 2.4vmin;
  will-change: transform;
}

#carousel .slide {
  position: relative;
  flex: 0 0 auto;
  width: var(--card);
  height: var(--card);
  border-radius: 18px;
  overflow: hidden;
  transform-origin: center center;
  will-change: transform, opacity;
  box-shadow: 0 24px 70px rgba(0,0,0,.55), 0 0 0 1px rgba(255,255,255,.06) inset;
}
#carousel .slide img { width: 100%; height: 100%; object-fit: cover; display: block; }

#carousel .slide .caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 26px 18px 14px;
  font-size: 15px;
  letter-spacing: .3px;
  background: linear-gradient(transparent, rgba(0,0,0,.72));
  text-shadow: 0 1px 4px rgba(0,0,0,.8);
}

#carousel .empty {
  position: absolute; inset: 0;
  display: grid; place-items: center; text-align: center;
  border: 1px dashed rgba(255,255,255,.22);
  border-radius: 18px;
  color: rgba(242,246,250,.7);
  padding: 24px;
  font-size: 16px;
  line-height: 1.5;
}

/* ---- brand ---- */
#brand {
  position: fixed;
  top: 22px; left: 26px;
  z-index: 5;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
  text-shadow: 0 2px 12px rgba(0,0,0,.7);
  opacity: .92;
}
.b-benz { color: #f7a72b; } /* gasoline amber-orange */
#brand .b-zen { color: var(--ink); }

/* ---- now playing (bottom-left, faint) ---- */
#now-playing {
  position: fixed;
  bottom: 22px; left: 26px;
  z-index: 5;
  max-width: 42vw;
  font-size: 13px;
  letter-spacing: .3px;
  color: rgba(242,246,250,.42);
  text-shadow: 0 1px 6px rgba(0,0,0,.6);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 0;
  transition: opacity .6s ease;
  pointer-events: none;
}
#now-playing.show { opacity: 1; }

/* ---- upload button (bottom-right, branded font) ---- */
#controls {
  position: fixed;
  bottom: 22px; right: 24px;
  z-index: 5;
  display: flex;
  gap: 10px;
  align-items: center;
}
#upload-btn {
  font: inherit;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 1px;
  color: var(--ink);
  background: rgba(18,24,34,.6);
  border: 1px solid rgba(255,255,255,.15);
  backdrop-filter: blur(8px);
  padding: 11px 20px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s, transform .1s;
}
#upload-btn:hover { background: rgba(34,44,60,.8); }
#upload-btn:active { transform: scale(.96); }

/* ---- sound toggle (top-right, borderless icon) ---- */
#sound-btn {
  position: fixed;
  top: 18px; right: 22px;
  z-index: 5;
  font-size: 22px;
  line-height: 1;
  color: var(--ink);
  background: none;
  border: none;
  padding: 6px;
  cursor: pointer;
  opacity: .82;
  text-shadow: 0 2px 10px rgba(0,0,0,.7);
  transition: opacity .2s, transform .1s;
}
#sound-btn:hover { opacity: 1; }
#sound-btn:active { transform: scale(.9); }

/* ---- modal ---- */
.modal {
  position: fixed; inset: 0; z-index: 20;
  display: grid; place-items: center;
  background: rgba(4,8,14,.68);
  backdrop-filter: blur(4px);
}
.modal.hidden { display: none; }
.modal-card {
  position: relative;
  width: min(440px, 92vw);
  background: rgba(17,23,31,.82);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 18px;
  padding: 26px 24px 22px;
  box-shadow: 0 30px 90px rgba(0,0,0,.6);
}
.modal-card h2 {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .5px;
}
.modal-sub { margin: 0 0 18px; font-size: 14px; color: rgba(242,246,250,.65); line-height: 1.5; }
.modal-close {
  position: absolute; top: 12px; right: 14px;
  background: none; border: none; color: var(--ink);
  font-size: 26px; line-height: 1; cursor: pointer; opacity: .6;
}
.modal-close:hover { opacity: 1; }

.drop {
  display: grid; place-items: center;
  position: relative;
  min-height: 150px;
  border: 2px dashed rgba(255,255,255,.2);
  border-radius: 12px;
  cursor: pointer;
  text-align: center;
  color: rgba(242,246,250,.7);
  overflow: hidden;
  transition: border-color .2s, background .2s;
}
.drop:hover { border-color: var(--accent); background: rgba(247,167,43,.07); }
.drop input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.drop small { color: rgba(242,246,250,.45); }
#preview { display: none; max-width: 100%; max-height: 220px; border-radius: 8px; }
.drop.has-image #drop-text { display: none; }
.drop.has-image #preview { display: block; }

#station {
  width: 100%;
  margin-top: 12px;
  padding: 11px 14px;
  font: inherit;
  color: var(--ink);
  background: #0e131b;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 10px;
}
#station::placeholder { color: rgba(242,246,250,.4); }
#station:focus { outline: none; border-color: var(--accent); }

#submit-btn {
  width: 100%;
  margin-top: 14px;
  padding: 13px;
  font: inherit; font-weight: 700; letter-spacing: .5px;
  color: #241502;
  background: var(--accent);
  border: none; border-radius: 999px;
  cursor: pointer;
  transition: filter .2s, transform .1s;
}
#submit-btn:active { transform: scale(.98); }
#submit-btn:hover { filter: brightness(1.08); }
#submit-btn:disabled { opacity: .5; cursor: default; }

.msg { margin-top: 12px; font-size: 14px; min-height: 20px; text-align: center; }
.msg.ok { color: #7fe3a4; }
.msg.err { color: #ff9a9a; }

@media (max-width: 560px) {
  #brand { font-size: 18px; top: 16px; left: 16px; }
  #sound-btn { top: 14px; right: 14px; padding: 9px 12px; }
  #controls { bottom: 16px; right: 14px; }
  #upload-btn { padding: 9px 15px; font-size: 14px; }
  #now-playing { bottom: 14px; left: 16px; max-width: 55vw; font-size: 12px; }
}