* { font-family: 'Quicksand', sans-serif; }
        body {
            background: linear-gradient(135deg, #0a1628 0%, #0d2847 30%, #0a1e3a 60%, #07152a 100%);
            color: #ffffff;
            min-height: 100vh;
}
        .ocean-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
            radial-gradient(circle at 30% 40%, rgba(0, 200, 255, 0.08) 0%, transparent 40%),
            radial-gradient(circle at 70% 60%, rgba(0, 100, 255, 0.1) 0%, transparent 40%);
            z-index: -2;
}
        .ocean-card {
            background: rgba(10, 30, 50, 0.35);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border: 1px solid rgba(0, 200, 255, 0.2);
            border-radius: 28px;
            transition: all 0.35s ease;
            box-shadow: 0 8px 32px rgba(0, 50, 100, 0.15);
}
        .ocean-card:hover {border-color: rgba(0, 200, 255, 0.5);}
        
        .ocean-btn {
            background: rgba(0, 150, 255, 0.15);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(0, 200, 255, 0.3);
            border-radius: 60px;
            padding: 12px 24px;
            color: white;
            font-weight: 600;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
}
        .ocean-btn-primary {
            background: linear-gradient(135deg, rgba(0, 180, 255, 0.85), rgba(0, 100, 200, 0.85));
            border: 1px solid rgba(255, 255, 255, 0.2);
            box-shadow: 0 8px 24px rgba(0, 150, 255, 0.25);
}
        .ocean-btn-danger {
            background: rgba(239, 68, 68, 0.15);
            border: 1px solid rgba(239, 68, 68, 0.3);
            color: #f87171;
}
        .ocean-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(0, 200, 255, 0.3);
            border-color: rgba(0, 255, 255, 0.6);
}
        .ocean-text {
            background: linear-gradient(135deg, #00d4ff 0%, #0099ff 40%, #0066cc 70%, #00ffff 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 800;
}
        .navbar-ocean {
            background: rgba(8, 25, 45, 0.6);
            backdrop-filter: blur(20px) saturate(180%);
            -webkit-backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid rgba(0, 200, 255, 0.15);
}
        .stat-card {
            background: rgba(0, 150, 255, 0.06);
            border-radius: 20px;
            padding: 20px 16px;
            text-align: center;
            border: 1px solid rgba(0, 200, 255, 0.1);
            transition: all 0.3s ease;
}
        .stat-card:hover {
            border-color: rgba(0, 200, 255, 0.3);
            background: rgba(0, 150, 255, 0.1);
}
        .avatar-ring {
            position: relative;
            display: inline-block;
}

        .avatar-ring::before {
            content: '';
            position: absolute;
            inset: -4px;
            background: linear-gradient(135deg, #00d4ff, #0099ff);
            border-radius: 50%;
            opacity: 0.4;
        }

        .shark-badge {
            background: linear-gradient(135deg, #00d4ff, #0066cc);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
/* Thêm style cho nút ngôn ngữ và feedback cards (nếu cần) */
#lang-toggle, #lang-toggle-mobile {
    font-size: 1.25rem;
    line-height: 1;
    min-width: 44px;
    text-align: center;
}

/* Đảm bảo feedback card hiển thị đồng bộ */
#feedback-container .ocean-card {
    transition: all 0.3s ease;
}

/* Responsive mobile */
@media (max-width: 768px) {
    #feedback-container {
        grid-template-columns: 1fr;
    }
}