.st-3d-wrapper {
    position: relative;
    width: 100%;
    min-height: 80vh;
    background-color: #050507; /* جایگزین مشکی مطلق */
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1000px;
}

/* هاله نوری در پس زمینه برای ایجاد عمق */
.st-ambient-glow {
    position: absolute;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.03) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    will-change: transform;
}

/* المان‌های شناور و محو (سیارات کوچک اطراف کارت) */
.st-floating-shape {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    will-change: transform;
}
.st-shape-1 { width: 150px; height: 150px; top: 15%; left: 15%; filter: blur(3px); }
.st-shape-2 { width: 80px; height: 80px; bottom: 20%; right: 20%; filter: blur(1px); }

/* کارت اصلی (متریال شیشه‌ای رده بالا) */
.st-premium-card {
    position: relative;
    width: 90%;
    max-width: 450px;
    padding: 3rem 2rem;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    text-align: center;
    z-index: 10;
    will-change: transform;
    transform-style: preserve-3d;
}

.st-premium-card h2 {
    color: #ffffff;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -1px;
    text-shadow: 0 10px 20px rgba(0,0,0,0.5);
}

.st-premium-card p {
    color: #a0a0a5;
    font-size: 1.1rem;
    line-height: 1.6;
}