* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0a0a;
  --text: #e8e8e8;
  --muted: #8a8a8a;
  --btn: #1a1a1a;
  --btn-hover: #252525;
  --btn-active: #333333;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  user-select: none;
  overflow: hidden;
}

/* CARRUSEL 3D (6 CATEGORÍAS) */
.carousel-container {
  position: relative;
  width: 100%;
  height: 220px;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1000px;
}

.box {
  position: relative;
  width: 140px;
  height: 140px;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
  transform: rotateY(0deg);
}

.box span {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform-origin: center;
  transform-style: preserve-3d;
  transform: rotateY(calc(var(--i) * 60deg)) translateZ(210px);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card {
  width: 100%;
  height: 100%;
  background: rgba(22, 22, 22, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  cursor: pointer;
}

.card .icon {
  width: 34px;
  height: 34px;
  color: #ffffff;
  opacity: 0.85;
}

.card .title {
  font-size: 12px;
  font-weight: 500;
  color: #cccccc;
  text-align: center;
}

/* REPRODUCTOR */
.radio {
  width: 100%;
  max-width: 320px;
  padding: 20px 24px 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.frequency {
  font-size: 68px;
  font-weight: 200;
  font-variant-numeric: tabular-nums;
}

.station {
  font-size: 13px;
  color: var(--muted);
  text-align: center;
  max-width: 280px;
  height: 18px;
}

.controls {
  display: flex;
  align-items: center;
  gap: 28px;
}

.btn {
  width: 54px;
  height: 54px;
  border: none;
  border-radius: 50%;
  background: var(--btn);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:hover {
  background: var(--btn-hover);
}

.btn:active {
  background: var(--btn-active);
  transform: scale(0.95);
}

.btn-power {
  width: 62px;
  height: 62px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-power.playing {
  background: #ffffff;
  color: #000000;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.status {
  font-size: 12px;
  color: var(--muted);
  min-height: 16px;
}

svg {
  width: 22px;
  height: 22px;
}

.btn-power svg {
  width: 26px;
  height: 26px;
}

@keyframes pulse {
  0% { opacity: 0.3; }
  50% { opacity: 0.9; }
  100% { opacity: 0.3; }
}

.loading {
  animation: pulse 1.4s infinite ease-in-out;
}