/* ===== PLAYING CARD STYLES with Liquid Glass ===== */
    .playing-card {
      width: 160px;
      height: 220px;
      border-radius: 16px;
      position: relative;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      overflow: hidden;
      background: rgba(255, 255, 255, 0.05);
      backdrop-filter: blur(10px) saturate(150%);
      -webkit-backdrop-filter: blur(10px) saturate(150%);
      border: 1px solid rgba(255, 255, 255, 0.15);
      box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    }

    .playing-card:hover {
      transform: translateY(-8px) scale(1.02);
      box-shadow:
        0 20px 50px rgba(0, 106, 133, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
      border-color: rgba(0, 106, 133, 0.4);
    }

    .playing-card.selected {
      border-color: rgba(0, 106, 133, 0.6);
      box-shadow:
        0 0 30px rgba(0, 106, 133, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    }

    .playing-card.deselected {
      filter: grayscale(80%);
      opacity: 0.5;
      border-color: rgba(255, 255, 255, 0.08);
    }

    .playing-card.deselected:hover {
      filter: grayscale(40%);
      opacity: 0.8;
    }

    .playing-card-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      position: absolute;
      top: 0;
      left: 0;
    }

    .playing-card-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, rgba(0, 0, 0, 0.95) 0%, rgba(0, 0, 0, 0.7) 50%, transparent 100%);
      padding: 40px 10px 10px 10px;
      color: white;
    }

    .playing-card-name {
      font-weight: 600;
      font-size: 0.9rem;
      margin-bottom: 4px;
      text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
    }

    .playing-card-ages {
      font-size: 0.8rem;
      color: rgba(255, 255, 255, 0.9);
      display: flex;
      gap: 6px;
    }

    .playing-card-age {
      background: rgba(0, 106, 133, 0.7);
      padding: 3px 7px;
      border-radius: 5px;
      font-size: 0.72rem;
      font-weight: 600;
    }

    .playing-card-check {
      position: absolute;
      top: 8px;
      right: 8px;
      width: 24px;
      height: 24px;
      background: #006a85;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: opacity 0.2s;
      box-shadow: 0 2px 8px rgba(0, 106, 133, 0.5);
    }

    .playing-card.selected .playing-card-check {
      opacity: 1;
    }

    /* ===== DECK/PILE STYLES with Liquid Glass ===== */
    .card-deck {
      position: relative;
      width: 180px;
      height: 240px;
      cursor: pointer;
    }

    .card-deck-card {
      position: absolute;
      width: 160px;
      height: 220px;
      border-radius: 16px;
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(8px) saturate(120%);
      -webkit-backdrop-filter: blur(8px) saturate(120%);
      border: 1px solid rgba(255, 255, 255, 0.12);
      box-shadow:
        0 4px 20px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      overflow: hidden;
    }

    .card-deck-card:nth-child(1) {
      z-index: 5;
      transform: rotate(0deg);
    }

    .card-deck-card:nth-child(2) {
      z-index: 4;
      transform: translateX(6px) translateY(-3px) rotate(2deg);
    }

    .card-deck-card:nth-child(3) {
      z-index: 3;
      transform: translateX(12px) translateY(-6px) rotate(4deg);
    }

    .card-deck-card:nth-child(4) {
      z-index: 2;
      transform: translateX(18px) translateY(-9px) rotate(6deg);
    }

    .card-deck-card:nth-child(5) {
      z-index: 1;
      transform: translateX(24px) translateY(-12px) rotate(8deg);
    }

    .card-deck:hover .card-deck-card:nth-child(1) {
      transform: translateY(-10px);
    }

    .card-deck:hover .card-deck-card:nth-child(2) {
      transform: translateX(8px) translateY(-6px) rotate(3deg);
    }

    .card-deck:hover .card-deck-card:nth-child(3) {
      transform: translateX(16px) translateY(-10px) rotate(6deg);
    }

    .card-deck:hover .card-deck-card:nth-child(4) {
      transform: translateX(24px) translateY(-14px) rotate(9deg);
    }

    .card-deck:hover .card-deck-card:nth-child(5) {
      transform: translateX(32px) translateY(-18px) rotate(12deg);
    }

    .card-deck-count {
      position: absolute;
      bottom: -30px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(0, 106, 133, 0.9);
      color: white;
      padding: 4px 12px;
      border-radius: 12px;
      font-size: 0.8rem;
      font-weight: 600;
      white-space: nowrap;
    }

    .card-deck-shuffling .card-deck-card {
      animation: deckShuffle 0.6s ease-in-out;
    }

    @keyframes deckShuffle {
      0% {
        transform: translateX(0) rotate(0deg);
      }

      25% {
        transform: translateX(30px) translateY(-20px) rotate(15deg);
      }

      50% {
        transform: translateX(60px) translateY(-30px) rotate(-10deg);
      }

      75% {
        transform: translateX(30px) translateY(-15px) rotate(5deg);
      }

      100% {
        transform: translateX(0) rotate(0deg);
      }
    }

    /* ===== CARD PILES with Liquid Glass ===== */
    .card-pile {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      padding: 20px;
      min-height: 260px;
      width: 100%;
    }

    @media (max-width: 1400px) {
      .card-pile {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    @media (max-width: 1100px) {
      .card-pile {
        grid-template-columns: repeat(3, 1fr);
      }
    }

    @media (max-width: 768px) {
      .card-pile {
        grid-template-columns: repeat(2, 1fr);
      }
    }