/* Card chính */
.card-wrapper {
    perspective: 1500px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    transform-style: preserve-3d;
    margin: 20px 0;
    z-index: 100;
}

.card-container {
    width: 900px;
    max-width: 95%;
    min-height: 650px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 48px;
    overflow: hidden; /* đảm bảo nội dung không tràn ra ngoài bo góc */
    display: flex;
    position: relative;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 200;
    animation: floatSoft 8s infinite ease-in-out;
    -webkit-mask-image: -webkit-radial-gradient(white, black); /* fix lỗi bo góc trên Safari */
}

.card-container:hover {
    box-shadow: 0 40px 100px -20px rgba(0,0,0,0.5), 0 0 45px var(--hover-glow);
    transform: translateY(-12px) scale(1.01);
}

@keyframes floatSoft {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Viền RGB */
.rgb-flow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 48px; /* đồng bộ với card-container */
    padding: 2px;
    background: linear-gradient(90deg, #f43f5e, #eab308, #22c55e, #3b82f6, #8b5cf6, #d946ef, #f43f5e);
    background-size: 400% 100%;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: rgbStream 8s linear infinite;
    pointer-events: none;
    z-index: 15;
    opacity: 0.7;
}

.rgb-flow.reverse {
    border-radius: 48px;
    background: linear-gradient(270deg, #f43f5e, #eab308, #22c55e, #3b82f6, #8b5cf6, #d946ef, #f43f5e);
    animation: rgbStreamReverse 10s linear infinite;
    opacity: 0.4;
}

@keyframes rgbStream { 100% { background-position: 400% 0; } }
@keyframes rgbStreamReverse { 100% { background-position: 0% 0; } }