.cube-lab {
  --bg: #07090d;
  --panel: #10141c;
  --ink: #f4f1e8;
  --muted: #b7b3a8;
  --line: #2a3140;
  --accent: #7ee0c4;
  --yellow: #ffe066;
  --orange: #ff9f43;
  --pink: #ff6b9d;
  --blue: #6cb6ff;
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--bg);
  border-radius: 16px;
  padding: 1.5rem 1.25rem 2rem;
  margin: 0 0 2rem;
  border: 1px solid var(--line);
  box-shadow: 0 0 0 1px rgba(126,224,196,0.08), 0 24px 60px rgba(0,0,0,0.35);
}
.cube-lab *, .cube-lab *::before, .cube-lab *::after { box-sizing: border-box; }
.cube-lab h1, .cube-lab h2, .cube-lab h3 { font-weight: 700; letter-spacing: -0.02em; color: var(--ink); margin: 0 0 0.6rem; }
.cube-lab h1 { font-size: clamp(1.6rem, 3vw, 2.15rem); line-height: 1.2; }
.cube-lab h2 { font-size: 1.25rem; margin-top: 2rem; color: var(--accent); }
.cube-lab p, .cube-lab li { color: var(--muted); line-height: 1.55; }
.cube-lab .lede { font-size: 1.05rem; color: var(--ink); max-width: 46rem; }
.cube-lab .meta { font-size: 0.9rem; color: var(--muted); margin: 0.4rem 0 1.4rem; }
.cube-lab a { color: var(--accent); }
.cube-lab kbd, .cube-lab code, .cube-lab .algo {
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--yellow);
  background: #1a1f2a;
  border: 1px solid #2e3648;
  border-radius: 6px;
  padding: 0.05em 0.4em;
  white-space: nowrap;
}
.cube-player, .cube-slides, .cube-card-wrap { width: 100%; }
.cube-frame {
  position: relative;
  width: 100%;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.cube-frame video, .cube-frame img.slide, .cube-frame .poster {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
}
.cube-pending {
  position: relative;
}
.cube-pending .poster { display: block; width: 100%; height: auto; filter: brightness(0.72); }
.cube-pending .note {
  position: absolute; inset: auto 1rem 1rem 1rem;
  background: rgba(7,9,13,0.86);
  color: var(--ink);
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  margin: 0;
}
.cube-slide-nav {
  display: flex; align-items: center; justify-content: space-between; gap: 0.75rem;
  margin-top: 0.75rem; flex-wrap: wrap;
}
.cube-slide-nav button, .cube-card-nav button, .cube-filters button {
  appearance: none; cursor: pointer;
  background: #1a2130; color: var(--ink);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 0.45rem 0.9rem; font: inherit; font-size: 0.92rem;
}
.cube-slide-nav button:hover, .cube-card-nav button:hover, .cube-filters button:hover {
  border-color: var(--accent); color: var(--accent);
}
.cube-filters button[aria-pressed="true"], .cube-dots button[aria-current="true"] {
  background: #16332c; border-color: var(--accent); color: var(--accent);
}
.cube-caption { color: var(--ink); margin: 0; flex: 1; min-width: 12rem; }
.cube-dots { display: flex; gap: 0.35rem; flex-wrap: wrap; margin-top: 0.6rem; }
.cube-dots button {
  width: 10px; height: 10px; padding: 0; border-radius: 50%;
  background: #2a3140; border: 0; cursor: pointer;
}
.cube-dots button[aria-current="true"] { background: var(--accent); width: auto; height: 10px; border-radius: 999px; padding: 0 7px; }
.cube-steps { display: grid; gap: 0.75rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.cube-steps li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  color: var(--ink);
}
.cube-steps .step-label { display: block; color: var(--orange); font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.2rem; }
.cube-filters { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 1rem 0; }
.cube-card-stage { perspective: 1200px; min-height: 220px; }
.cube-flip {
  width: 100%; min-height: 220px; cursor: pointer;
  border: 0; background: transparent; padding: 0; text-align: left; color: inherit; font: inherit;
}
.cube-flip-inner {
  position: relative; width: 100%; min-height: 220px;
  transform-style: preserve-3d; transition: transform 0.55s ease;
}
.cube-flip.is-flipped .cube-flip-inner { transform: rotateY(180deg); }
.cube-face {
  position: absolute; inset: 0; min-height: 220px;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border-radius: 14px; padding: 1.25rem 1.3rem;
  border: 1px solid var(--line);
  display: flex; flex-direction: column; justify-content: center;
}
.cube-front { background: linear-gradient(165deg, #151b27, #0d1118); }
.cube-back { background: linear-gradient(165deg, #14241f, #0d1512); transform: rotateY(180deg); }
.cube-kicker { font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--blue); margin: 0 0 0.5rem; }
.cube-back .cube-kicker { color: var(--accent); }
.cube-q, .cube-a { margin: 0; font-size: 1.15rem; line-height: 1.45; color: var(--ink); }
.cube-a { color: var(--yellow); font-family: "SF Mono", "Menlo", "Consolas", monospace; font-size: 1.2rem; letter-spacing: 0.02em; }
.cube-card-nav { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.85rem; flex-wrap: wrap; }
.cube-progress { margin-left: auto; color: var(--muted); font-size: 0.9rem; }
.cube-hint { font-size: 0.85rem; color: var(--muted); margin: 0.6rem 0 0; }
.cube-tags { margin: 1.5rem 0 0; font-size: 0.85rem; color: #8b877c; }
@media (max-width: 640px) {
  .cube-lab { padding: 1.1rem 0.85rem 1.5rem; border-radius: 12px; }
  .cube-q, .cube-a { font-size: 1.02rem; }
}