body { background-color: #050505; color: #e5e5e5; font-family: 'Inter', sans-serif; }
    
    .breadcrumb { color: #555; font-size: 11px; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; }
    .breadcrumb a:hover { color: #fff; }

    .tab-btn { 
        position: relative; color: #777; transition: color 0.3s ease; padding-bottom: 12px;
        font-size: 13px; background: none; border: none; cursor: pointer;
    }
    .tab-btn:hover { color: #fff; }
    .tab-btn.active { color: #fff; }
    .tab-btn.active::after {
        content: ""; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px; background-color: #0078d4; 
    }

    /* --- 3D CARD STRUCTURE --- */
    .profile-card {
        perspective: 1000px;
        cursor: pointer;
        height: 520px; /* নাম যেন সব ডিভাইসে দেখা যায় তাই হাইট সামান্য বাড়ানো হয়েছে */
        transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    .profile-card:hover { 
        transform: translateY(-10px); 
        box-shadow: 0 15px 40px rgba(255, 255, 255, 0.08); /* শ্যাডো হালকা বাড়ানো হয়েছে */
    }

    .card-inner {
        position: relative;
        width: 100%;
        height: 100%;
        transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        transform-style: preserve-3d;
    }

    .is-flipped { transform: rotateY(180deg); }

    .card-front, .card-back {
        position: absolute;
        width: 100%;
        height: 100%;
        backface-visibility: hidden;
        border: 1px solid rgba(255, 255, 255, 0.1);
        overflow: hidden;
        border-radius: 0px; /* কোণাগুলো চারকোনা করা হয়েছে */
    }

    .card-front { background-color: #050505; display: flex; flex-direction: column; }
    .image-placeholder { background: linear-gradient(180deg, #111 0%, #080808 100%); flex-shrink: 0; }

    /* --- BACK SIDE STYLING --- */
    .card-back {
        background-color: #030303;
        transform: rotateY(180deg);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 40px 20px;
        box-shadow: inset 0 0 50px rgba(255, 255, 255, 0.03);
        text-align: center;
    }

    .bio-name { font-size: 26px; font-weight: 700; color: #fff; margin-bottom: 4px; }
    .bio-title { 
        font-size: 11px; text-transform: uppercase; letter-spacing: 4px; 
        color: #aaa; font-weight: 600; margin-bottom: 30px; 
    }
    .bio-text { 
        font-size: 14px; line-height: 1.6; color: #ddd; 
        text-align: center; margin-bottom: 40px; font-weight: 400; max-width: 90%;
    }

    .social-group {
        display: flex; 
        gap: 25px;
        margin-bottom: 40px;
        justify-content: center;
    }
    
    .social-icon-link { 
        color: #777;
        transition: all 0.3s ease;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .social-icon-link:hover { 
        color: #fff; 
        transform: scale(1.1);
    }
    
    .social-icon-link svg {
        width: 22px;
        height: 22px;
        stroke-width: 1.2px;
    }

    .visit-btn {
        background-color: transparent; 
        border: 1px solid #fff; 
        color: #fff;
        padding: 10px 30px; 
        font-size: 11px; 
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 2px; 
        transition: all 0.3s ease; 
        text-decoration: none;
        border-radius: 0px; /* বাটন চারকোনা করা হয়েছে */
    }

    .visit-btn:hover { background-color: #fff; color: #000; }

    /* --- RESPONSIVE GRID SYSTEM --- */
    .card-grid {
        display: grid;
        gap: 2.5rem;
    }

    @media (min-width: 1024px) {
        .card-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (min-width: 640px) and (max-width: 1023px) {
        .card-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 639px) {
        .card-grid { grid-template-columns: repeat(1, 1fr); }
    }