:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% -10%, #2a2f4f 0%, transparent 60%),
              radial-gradient(1200px 800px at 120% 10%, #4c2a85 0%, transparent 60%),
              linear-gradient(180deg, #0b1020 0%, #0f1530 100%);
  min-height: 100vh;
  color: #e7e7ee;
}

.container { max-width: 1200px; margin: 0 auto; padding: 28px; }
header { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }
header h1 { margin: 0; font-weight: 800; letter-spacing: .3px; }
header p { opacity: .8; }

.controls { display: grid; grid-template-columns: 1fr minmax(240px, 300px) 220px; gap: 12px; align-items: center; margin-bottom: 18px; }
.control input, .control select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(18, 24, 48, .8);
  color: #fff;
}
.control input::placeholder { color: #c8c8d8; }

.control.volume { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: center; }
.control.volume label { font-weight: 700; opacity: .9; }
.control.volume input[type="range"] { accent-color: #8b5cf6; }

.error { background: rgba(255, 99, 99, .12); color: #ffd1d1; border: 1px solid rgba(255, 99, 99, .3); padding: 10px 12px; border-radius: 10px; margin-bottom: 12px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }
.sound {
  padding: 18px 16px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.08);
  background: linear-gradient(135deg, rgba(88, 28, 135, 0.9), rgba(59, 130, 246, 0.9));
  color: #fff;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: .2px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}
.sound:hover { filter: brightness(1.06); }
.sound:disabled { opacity: 0.6; cursor: not-allowed; }

.hint { opacity: .7; padding: 24px 0; }

.footer-info {
  margin-top: 14px;
  opacity: .8;
  font-size: 14px;
}

.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.tab {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(18,24,48,.6);
  color: #e7e7ee;
}
.tab.active { background: linear-gradient(135deg, rgba(88,28,135,.9), rgba(59,130,246,.9)); color: #fff; border-color: transparent; }