:root {
  --bg: #0f1419;
  --panel: #1a222c;
  --line: #2c3846;
  --text: #f2f5f8;
  --muted: #9aa8b6;
  --accent: #3d9a5f;
  --accent-2: #2e7d32;
  --danger: #c62828;
  --radius: 14px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 10% -10%, #1e3a2f 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1a2a3d 0%, transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
}

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

.top {
  display: grid;
  gap: 16px;
  margin-bottom: 18px;
}

.brand h1 {
  margin: 0;
  font-size: 32px;
  letter-spacing: 0.02em;
}

.brand p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.top-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
  min-width: 180px;
}

.field.grow {
  flex: 1;
  min-width: 220px;
}

.field span {
  font-size: 14px;
  color: var(--muted);
}

select,
input {
  height: 52px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-size: 18px;
  padding: 0 14px;
}

.main {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 16px;
  min-height: calc(100vh - 160px);
}

.sidebar,
.stage {
  background: color-mix(in srgb, var(--panel) 92%, black);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.meta {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}

.list {
  max-height: calc(100vh - 220px);
  overflow: auto;
}

.channel {
  width: 100%;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 12px;
  align-items: center;
  text-align: left;
  padding: 12px 14px;
  border: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.channel:hover,
.channel.active {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
}

.channel img,
.channel .ph {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  object-fit: contain;
  background: #0b1015;
}

.channel .ph {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 12px;
}

.channel strong {
  display: block;
  font-size: 17px;
  font-weight: 600;
}

.channel small {
  color: var(--muted);
  font-size: 13px;
}

.stage {
  padding: 16px;
  display: grid;
  gap: 14px;
  align-content: start;
}

.player-wrap {
  position: relative;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

video {
  width: 100%;
  height: 100%;
  background: #000;
}

.now {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.65);
  font-size: 15px;
  pointer-events: none;
}

.tips {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.tips p {
  margin: 0 0 8px;
}

.tips code {
  display: block;
  padding: 12px;
  border-radius: 10px;
  background: #0b1015;
  color: #cde7d4;
  word-break: break-all;
  font-size: 13px;
}

.tips .note {
  margin-top: 10px;
  color: #b0bec5;
}

.empty,
.error {
  padding: 24px 16px;
  color: var(--muted);
  font-size: 16px;
}

.error {
  color: #ef9a9a;
}

@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
  }

  .list {
    max-height: 320px;
  }

  .brand h1 {
    font-size: 26px;
  }
}