:root{
  --bg:#08101b;
  --ui:rgba(11,18,32,.55);
  --line:rgba(255,255,255,.15);
  --text:rgba(255,255,255,.96);
  --muted:rgba(255,255,255,.74);
  --shadow:0 18px 60px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}
body{overflow:hidden}
button{font:inherit}
.app,.stage{width:100vw;height:100vh}
.stage{position:relative;display:grid;place-items:center;background:radial-gradient(circle at center,#13243f 0%,#08101b 55%,#050912 100%)}
.bg{position:absolute;inset:-3%;background-size:cover;background-position:center center;filter:blur(26px) saturate(1.05);transform:scale(1.06);opacity:0;transition:opacity 800ms ease}
.bg.active{opacity:.72}
.bg::after{content:"";position:absolute;inset:0;background:radial-gradient(1100px 640px at 50% 35%,rgba(0,0,0,.12),rgba(0,0,0,.72))}
.fgWrap{position:absolute;width:min(100vw,calc(100vh*16/9));height:min(100vh,calc(100vw*9/16));margin:0;display:grid;place-items:center;z-index:2;opacity:0;transform:scale(1.018);transition:opacity 520ms ease, transform 9s ease}
.fgWrap.active{opacity:1;transform:scale(1)}
.fg{width:100%;height:100%;object-fit:contain;user-select:none;-webkit-user-select:none;pointer-events:none;filter:drop-shadow(0 18px 44px rgba(0,0,0,.36))}
.netStatus,.hint,.topBar,.bottomBar,.nav{position:absolute;z-index:5}
.netStatus,.hint,.brand,.slideMeta,.title,.progressTrack,.nav{backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.netStatus{top:14px;right:14px;padding:10px 12px;border:1px solid var(--line);border-radius:999px;background:var(--ui);font-weight:700;font-size:12px;letter-spacing:.04em;text-transform:uppercase}
.netStatus.offline{background:rgba(0,0,0,.62)}
.hint{top:14px;left:14px;padding:10px 12px;border:1px solid var(--line);border-radius:999px;background:var(--ui);font-size:12px;color:var(--muted)}
.topBar{top:18px;left:50%;transform:translateX(-50%);width:min(1200px,calc(100vw - 140px));display:flex;justify-content:space-between;gap:16px;align-items:center;pointer-events:none}
.brand,.slideMeta,.title,.progressTrack{background:var(--ui);border:1px solid var(--line);box-shadow:var(--shadow)}
.brand{padding:10px 14px;border-radius:999px;font-size:12px;font-weight:800;letter-spacing:.12em}
.slideMeta{padding:10px 14px;border-radius:999px;display:flex;gap:10px;align-items:center;font-size:12px;font-weight:700}
#modePill{padding:4px 8px;border-radius:999px;background:rgba(255,255,255,.09);font-size:11px;letter-spacing:.06em}
.bottomBar{left:50%;bottom:18px;transform:translateX(-50%);width:min(1200px,calc(100vw - 60px));display:grid;gap:10px;pointer-events:none}
.title{padding:12px 16px;border-radius:16px;font-weight:800;letter-spacing:.02em;text-shadow:0 1px 2px rgba(0,0,0,.2)}
.progressTrack{height:8px;border-radius:999px;overflow:hidden}
.progressBar{height:100%;width:0;background:linear-gradient(90deg,rgba(255,255,255,.86),rgba(255,255,255,.55));transition:width 90ms linear}
.nav{top:50%;transform:translateY(-50%);width:54px;height:54px;border-radius:999px;border:1px solid var(--line);background:var(--ui);color:var(--text);display:grid;place-items:center;font-size:34px;line-height:1;cursor:pointer;box-shadow:var(--shadow)}
.nav:hover{background:rgba(20,30,52,.72)}
.nav.prev{left:18px}
.nav.next{right:18px}
@media (max-width: 900px){
  .topBar{width:calc(100vw - 28px);top:12px}
  .bottomBar{width:calc(100vw - 28px);bottom:12px}
  .hint{display:none}
  .brand{font-size:11px;padding:8px 10px}
  .slideMeta{font-size:11px;padding:8px 10px}
  .title{font-size:14px;padding:10px 12px}
  .nav{width:44px;height:44px;font-size:28px}
}
@media (prefers-reduced-motion: reduce){
  .bg,.fgWrap,.progressBar{transition:none}
}