:root { color-scheme: dark; font-family: Arial, Helvetica, sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; background: #101827; color: #fff; min-height: 100vh; }
.player { min-height: 100vh; display: grid; grid-template-rows: auto 1fr auto; }
header, footer { display: flex; align-items: center; gap: 16px; padding: 12px 18px; background: #172235; }
header { justify-content: space-between; }
h1 { font-size: clamp(15px, 2vw, 21px); margin: 0; font-weight: 600; }
#counter { white-space: nowrap; font-weight: 700; }
.stage { display: grid; place-items: center; min-height: 0; padding: 12px; }
#slide { display: block; max-width: 100%; max-height: calc(100vh - 130px); object-fit: contain; box-shadow: 0 6px 26px #0008; background: #fff; }
footer { justify-content: center; }
button { border: 0; border-radius: 7px; padding: 10px 17px; font-size: 15px; font-weight: 700; color: #fff; background: #1769aa; cursor: pointer; }
button:hover:not(:disabled), button:focus-visible { background: #2384d1; }
button:disabled { opacity: .42; cursor: default; }
.progress { height: 8px; width: min(42vw, 480px); background: #34445d; border-radius: 999px; overflow: hidden; }
#bar { height: 100%; width: 1.37%; background: #39b980; transition: width .18s ease; }
@media (max-width: 600px) { header { padding: 9px 12px; } footer { padding: 10px; gap: 8px; } button { padding: 9px 12px; } .stage { padding: 6px; } }