:root {
  --page: #07111f;
  --surface: #101d31;
  --surface-raised: #162844;
  --text: #f5f8ff;
  --muted: #b5c4da;
  --accent: #3dd6d0;
  --accent-strong: #15a6bf;
  --border: rgba(181, 196, 218, .24);
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at top, #193252 0, var(--page) 45rem);
  font: 16px/1.5 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: inherit; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  border-bottom: 1px solid var(--border);
  background: rgba(7, 17, 31, .85);
  backdrop-filter: blur(12px);
}

.brand { color: var(--text); font-size: 1.125rem; font-weight: 800; letter-spacing: .06em; text-decoration: none; }
.header-link { color: var(--muted); font-size: .9rem; text-decoration: none; }
.header-link:hover, .header-link:focus-visible { color: var(--accent); }

main { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; padding: clamp(2rem, 5vw, 4.5rem) 0 3rem; }
.channel-intro { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 1.25rem; margin-bottom: 1.75rem; }
.channel-logo { width: 6rem; max-height: 5rem; object-fit: contain; }
h1 { margin: 0; font-size: clamp(1.75rem, 4vw, 3rem); line-height: 1.1; }
.eyebrow { margin: 0 0 .35rem; color: var(--accent); font-size: .8rem; font-weight: 750; letter-spacing: .12em; text-transform: uppercase; }
.channel-intro p { margin: .45rem 0 0; color: var(--muted); }

.player-card { overflow: hidden; border: 1px solid var(--border); border-radius: 1rem; background: var(--surface); box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, .3); }
.player-card video { display: block; width: 100%; max-height: min(67vw, 630px); background: #000; }
.player-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: .75rem 1rem; }
.status { margin: 0; color: var(--muted); font-size: .9rem; }
.refresh { border: 1px solid var(--border); border-radius: .5rem; padding: .5rem .8rem; color: var(--text); background: var(--surface-raised); font: inherit; cursor: pointer; }
.refresh:hover, .refresh:focus-visible { border-color: var(--accent); background: #1d3b59; }

.channels { margin-top: 2.5rem; }
.channels h2 { margin: 0 0 1rem; font-size: 1.1rem; }
.channel-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr)); gap: .75rem; }
.channel-link { display: grid; place-items: center; min-height: 5.25rem; padding: .75rem; border: 1px solid var(--border); border-radius: .75rem; background: rgba(16, 29, 49, .82); transition: transform .16s ease, border-color .16s ease, background .16s ease; }
.channel-link:hover, .channel-link:focus-visible { border-color: var(--accent); background: var(--surface-raised); transform: translateY(-2px); }
.channel-link[aria-current="page"] { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.channel-link img { max-width: 100%; max-height: 3.5rem; object-fit: contain; }

.notice { margin: 2rem 0 0; padding: 1rem 1.1rem; border-left: 3px solid var(--accent); border-radius: .35rem; color: var(--muted); background: rgba(16, 29, 49, .7); }
.notice strong { color: var(--text); }
.site-footer { padding: 1.5rem 1rem 2.5rem; color: var(--muted); text-align: center; font-size: .875rem; }

@media (max-width: 520px) {
  .site-header { padding: .85rem 1rem; }
  .channel-intro { grid-template-columns: 1fr; }
  .channel-logo { width: 5.5rem; }
  .player-toolbar { align-items: flex-start; flex-direction: column; }
}