/*!
 * Coverflow Picker – CSS
 * Tuỳ biến qua CSS variables trên .cf-wrap (hoặc :root)
 */
.cf-wrap {
  --cf-card-w: min(46vw, 590px);   /* card ngang như ảnh mẫu */
  --cf-card-h: min(34vw, 440px);
  --cf-radius: 0px;
  --cf-max-w: 100%;
  --cf-fg: #f3f4f6;
  --cf-muted: #8b90a0;
  --cf-accent: #8f8352;
  --cf-track-line: #d9d6cc;
  --cf-btn-bg: #171a22;
  --cf-btn-bg-hover: #20242f;
  --cf-btn-border: #2c3140;
  --cf-dot: #3a3f4d;
  --cf-perspective: 1100px;

  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  color: var(--cf-fg);
}

.cf {
  position: relative;
  width: 100%;
  max-width: var(--cf-max-w);
  height: calc(var(--cf-card-h) * 1.45);
  perspective: var(--cf-perspective);
  perspective-origin: 50% 50%;
  touch-action: pan-y;
  user-select: none;
  -webkit-user-select: none;
  cursor: grab;
  outline: none;
  overflow: hidden;
}
.cf.cf-dragging { cursor: grabbing; }
.cf:focus-visible { outline: 2px solid var(--cf-accent); outline-offset: 6px; border-radius: 16px; }

.cf-track {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
}

.cf-item {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--cf-card-w);
  height: var(--cf-card-h);
  margin: calc(var(--cf-card-h) / -2) 0 0 calc(var(--cf-card-w) / -2);
  border-radius: var(--cf-radius);
  overflow: hidden;
  background: #222;
  box-shadow: none;
  will-change: transform, opacity;
  backface-visibility: hidden;
  -webkit-box-reflect: below 6px linear-gradient(transparent 70%, rgba(255, 255, 255, .18));
}
.cf-no-reflect .cf-item { -webkit-box-reflect: unset; }

.cf-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
  -webkit-user-drag: none;
}
.cf-item::after {
  content: "";
  position: absolute;
  inset: 0;
  background: #000;
  opacity: var(--cf-shade, 0);
  pointer-events: none;
}
.cf-num {
  position: absolute;
  left: 12px;
  bottom: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, .6);
}

/* Info */
.cf-info { margin-top: 12px; text-align: center; min-height: 48px; }
.cf-label { font-size: 22px; font-weight: 600; }
.cf-sub { font-size: 13px; color: var(--cf-muted); margin-top: 4px; }

/* Progress */
.cf-progress {
  position: relative;
  width: min(280px, 60vw);
  height: 3px;
  margin-top: 8px;
  background: linear-gradient(var(--cf-track-line), var(--cf-track-line)) center / 100% 1px no-repeat;
  cursor: pointer;
  overflow: hidden;
}
.cf-progress-bar {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--cf-accent);
  transition: transform .45s cubic-bezier(.22, .61, .36, 1);
}

/* Nav */
.cf-nav { display: flex; gap: 12px; margin-top: 18px; }
.cf-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--cf-btn-border);
  background: var(--cf-btn-bg);
  color: var(--cf-fg);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  transition: background .2s, border-color .2s;
}
.cf-btn:hover { background: var(--cf-btn-bg-hover); border-color: var(--cf-accent); }

/* Dots */
.cf-dots { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin-top: 16px; max-width: 90%; }
.cf-dot {
  width: 6px;
  height: 6px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--cf-dot);
  cursor: pointer;
  transition: background .3s, transform .3s;
}
.cf-dot.cf-on { background: var(--cf-accent); transform: scale(1.4); }

@media (max-width: 560px) {
  .cf-wrap { --cf-card-w: 86vw; --cf-card-h: 100vw; }
  .cf{ height: calc(var(--cf-card-h) * 1.15)}
}